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netsurf/render/layout.c
Vincent Sanders 17be8cf216 Put the font operations table alongside all the other core API 
The netsurf core is driven from numerous operation tables most of
which are now set through a common netsurf_register() interface. The
font and plotting interfaces are currently separate and unlike all the
other operation tables are modified for differing contexts.

This change moves the font operations alongside all the other
operations table and remove unnecessary interaction with the renderers
font internals. Further this also removes the need for css internals
to be visible in frontends.
2014-10-13 11:56:31 +01:00

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/*
* Copyright 2005 Richard Wilson <info@tinct.net>
* Copyright 2006 James Bursa <bursa@users.sourceforge.net>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
* HTML layout (implementation).
*
* Layout is carried out in two stages:
*
* 1. + calculation of minimum / maximum box widths, and
* + determination of whether block level boxes will have >zero height
*
* 2. + layout (position and dimensions)
*
* In most cases the functions for the two stages are a corresponding pair
* layout_minmax_X() and layout_X().
*/
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <dom/dom.h>
#include "utils/log.h"
#include "utils/talloc.h"
#include "utils/utils.h"
#include "css/css.h"
#include "css/utils.h"
#include "content/content_protected.h"
#include "utils/nsoption.h"
#include "desktop/scrollbar.h"
#include "desktop/textarea.h"
#include "desktop/font.h"
#include "render/box.h"
#include "render/font.h"
#include "render/form.h"
#include "render/html_internal.h"
#include "render/layout.h"
#include "render/table.h"
/* Define to enable layout debugging */
#undef LAYOUT_DEBUG
#define AUTO INT_MIN
/* Fixed point value percentage of an integer, to an integer */
#define FPCT_OF_INT_TOINT(a, b) FIXTOINT(FMUL(FDIV(a, F_100), INTTOFIX(b)))
static bool layout_block_context(struct box *block, int viewport_height,
html_content *content);
static void layout_minmax_block(struct box *block,
const struct font_functions *font_func);
static struct box* layout_next_margin_block(struct box *box, struct box *block,
int viewport_height, int *max_pos_margin, int *max_neg_margin);
static bool layout_block_object(struct box *block);
static void layout_get_object_dimensions(struct box *box,
int *width, int *height, int min_width, int max_width,
int min_height, int max_height);
static void layout_block_find_dimensions(int available_width,
int viewport_height, int lm, int rm,
struct box *box);
static bool layout_apply_minmax_height(struct box *box, struct box *container);
static void layout_block_add_scrollbar(struct box *box, int which);
static int layout_solve_width(struct box *box, int available_width, int width,
int lm, int rm, int max_width, int min_width);
static void layout_float_find_dimensions(int available_width,
const css_computed_style *style, struct box *box);
static void layout_find_dimensions(int available_width, int viewport_height,
struct box *box, const css_computed_style *style,
int *width, int *height, int *max_width, int *min_width,
int *max_height, int *min_height, int margin[4], int padding[4],
struct box_border border[4]);
static void layout_tweak_form_dimensions(struct box *box, bool percentage,
int available_width, bool setwidth, int *dimension);
static int layout_clear(struct box *fl, enum css_clear_e clear);
static void find_sides(struct box *fl, int y0, int y1,
int *x0, int *x1, struct box **left, struct box **right);
static void layout_minmax_inline_container(struct box *inline_container,
bool *has_height, const struct font_functions *font_func);
static int line_height(const css_computed_style *style);
static bool layout_line(struct box *first, int *width, int *y,
int cx, int cy, struct box *cont, bool indent,
bool has_text_children,
html_content *content, struct box **next_box);
static struct box *layout_minmax_line(struct box *first, int *min, int *max,
bool first_line, bool *line_has_height,
const struct font_functions *font_func);
static int layout_text_indent(const css_computed_style *style, int width);
static bool layout_float(struct box *b, int width, html_content *content);
static void place_float_below(struct box *c, int width, int cx, int y,
struct box *cont);
static bool layout_table(struct box *box, int available_width,
html_content *content);
static void layout_move_children(struct box *box, int x, int y);
static void calculate_mbp_width(const css_computed_style *style,
unsigned int side, bool margin, bool border, bool padding,
int *fixed, float *frac);
static void layout_lists(struct box *box,
const struct font_functions *font_func);
static void layout_position_relative(struct box *root, struct box *fp,
int fx, int fy);
static void layout_compute_relative_offset(struct box *box, int *x, int *y);
static bool layout_position_absolute(struct box *box,
struct box *containing_block,
int cx, int cy,
html_content *content);
static bool layout_absolute(struct box *box, struct box *containing_block,
int cx, int cy,
html_content *content);
static void layout_compute_offsets(struct box *box,
struct box *containing_block,
int *top, int *right, int *bottom, int *left);
/**
* Calculate positions of boxes in a document.
*
* \param doc content of type CONTENT_HTML
* \param width available width
* \param height available height
* \return true on success, false on memory exhaustion
*/
bool layout_document(html_content *content, int width, int height)
{
bool ret;
struct box *doc = content->layout;
const struct font_functions *font_func = content->font_func;
layout_minmax_block(doc, font_func);
layout_block_find_dimensions(width, height, 0, 0, doc);
doc->x = doc->margin[LEFT] + doc->border[LEFT].width;
doc->y = doc->margin[TOP] + doc->border[TOP].width;
width -= doc->margin[LEFT] + doc->border[LEFT].width +
doc->padding[LEFT] + doc->padding[RIGHT] +
doc->border[RIGHT].width + doc->margin[RIGHT];
if (width < 0)
width = 0;
doc->width = width;
ret = layout_block_context(doc, height, content);
/* make <html> and <body> fill available height */
if (doc->y + doc->padding[TOP] + doc->height + doc->padding[BOTTOM] +
doc->border[BOTTOM].width + doc->margin[BOTTOM] <
height) {
doc->height = height - (doc->y + doc->padding[TOP] +
doc->padding[BOTTOM] +
doc->border[BOTTOM].width +
doc->margin[BOTTOM]);
if (doc->children)
doc->children->height = doc->height -
(doc->children->margin[TOP] +
doc->children->border[TOP].width +
doc->children->padding[TOP] +
doc->children->padding[BOTTOM] +
doc->children->border[BOTTOM].width +
doc->children->margin[BOTTOM]);
}
layout_lists(doc, font_func);
layout_position_absolute(doc, doc, 0, 0, content);
layout_position_relative(doc, doc, 0, 0);
layout_calculate_descendant_bboxes(doc);
return ret;
}
/**
* Layout a block formatting context.
*
* \param block BLOCK, INLINE_BLOCK, or TABLE_CELL to layout
* \param viewport_height Height of viewport in pixels or -ve if unknown
* \param content Memory pool for any new boxes
* \return true on success, false on memory exhaustion
*
* This function carries out layout of a block and its children, as described
* in CSS 2.1 9.4.1.
*/
bool layout_block_context(struct box *block, int viewport_height,
html_content *content)
{
struct box *box;
int cx, cy; /**< current coordinates */
int max_pos_margin = 0;
int max_neg_margin = 0;
int y = 0;
int lm, rm;
struct box *margin_collapse = NULL;
bool in_margin = false;
css_fixed gadget_size;
css_unit gadget_unit; /* Checkbox / radio buttons */
assert(block->type == BOX_BLOCK ||
block->type == BOX_INLINE_BLOCK ||
block->type == BOX_TABLE_CELL);
assert(block->width != UNKNOWN_WIDTH);
assert(block->width != AUTO);
block->float_children = NULL;
block->clear_level = 0;
/* special case if the block contains an object */
if (block->object) {
int temp_width = block->width;
if (!layout_block_object(block))
return false;
layout_get_object_dimensions(block, &temp_width,
&block->height, INT_MIN, INT_MAX,
INT_MIN, INT_MAX);
return true;
} else if (block->flags & REPLACE_DIM) {
return true;
}
/* special case if the block contains an radio button or checkbox */
if (block->gadget && (block->gadget->type == GADGET_RADIO ||
block->gadget->type == GADGET_CHECKBOX)) {
/* form checkbox or radio button
* if width or height is AUTO, set it to 1em */
gadget_unit = CSS_UNIT_EM;
gadget_size = INTTOFIX(1);
if (block->height == AUTO)
block->height = FIXTOINT(nscss_len2px(gadget_size,
gadget_unit, block->style));
}
box = block->children;
/* set current coordinates to top-left of the block */
cx = 0;
y = cy = block->padding[TOP];
if (box)
box->y = block->padding[TOP];
/* Step through the descendants of the block in depth-first order, but
* not into the children of boxes which aren't blocks. For example, if
* the tree passed to this function looks like this (box->type shown):
*
* block -> BOX_BLOCK
* BOX_BLOCK * (1)
* BOX_INLINE_CONTAINER * (2)
* BOX_INLINE
* BOX_TEXT
* ...
* BOX_BLOCK * (3)
* BOX_TABLE * (4)
* BOX_TABLE_ROW
* BOX_TABLE_CELL
* ...
* BOX_TABLE_CELL
* ...
* BOX_BLOCK * (5)
* BOX_INLINE_CONTAINER * (6)
* BOX_TEXT
* ...
* then the while loop will visit each box marked with *, setting box
* to each in the order shown. */
while (box) {
enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE;
enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE;
assert(box->type == BOX_BLOCK || box->type == BOX_TABLE ||
box->type == BOX_INLINE_CONTAINER);
/* Tables are laid out before being positioned, because the
* position depends on the width which is calculated in
* table layout. Blocks and inline containers are positioned
* before being laid out, because width is not dependent on
* content, and the position is required during layout for
* correct handling of floats.
*/
if (box->style &&
(css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(box->style) ==
CSS_POSITION_FIXED)) {
box->x = box->parent->padding[LEFT];
/* absolute positioned; this element will establish
* its own block context when it gets laid out later,
* so no need to look at its children now. */
goto advance_to_next_box;
}
/* If we don't know which box the current margin collapses
* through to, find out. Update the pos/neg margin values. */
if (margin_collapse == NULL) {
margin_collapse = layout_next_margin_block(box, block,
viewport_height,
&max_pos_margin, &max_neg_margin);
/* We have a margin that has not yet been applied. */
in_margin = true;
}
/* Clearance. */
y = 0;
if (box->style && css_computed_clear(box->style) !=
CSS_CLEAR_NONE)
y = layout_clear(block->float_children,
css_computed_clear(box->style));
/* Find box's overflow properties */
if (box->style) {
overflow_x = css_computed_overflow_x(box->style);
overflow_y = css_computed_overflow_y(box->style);
}
/* Blocks establishing a block formatting context get minimum
* left and right margins to avoid any floats. */
lm = rm = 0;
if (box->type == BOX_BLOCK || box->flags & IFRAME) {
if (!box->object && !(box->flags & IFRAME) &&
!(box->flags & REPLACE_DIM) &&
box->style &&
(overflow_x != CSS_OVERFLOW_VISIBLE ||
overflow_y != CSS_OVERFLOW_VISIBLE)) {
/* box establishes new block formatting context
* so available width may be diminished due to
* floats. */
int x0, x1, top;
struct box *left, *right;
top = cy + max_pos_margin - max_neg_margin;
top = (top > y) ? top : y;
x0 = cx;
x1 = cx + box->parent->width -
box->parent->padding[LEFT] -
box->parent->padding[RIGHT];
find_sides(block->float_children, top, top,
&x0, &x1, &left, &right);
/* calculate min required left & right margins
* needed to avoid floats */
lm = x0 - cx;
rm = cx + box->parent->width -
box->parent->padding[LEFT] -
box->parent->padding[RIGHT] -
x1;
}
layout_block_find_dimensions(box->parent->width,
viewport_height, lm, rm, box);
if (box->type == BOX_BLOCK && !(box->flags & IFRAME)) {
layout_block_add_scrollbar(box, RIGHT);
layout_block_add_scrollbar(box, BOTTOM);
}
} else if (box->type == BOX_TABLE) {
if (box->style != NULL) {
enum css_width_e wtype;
css_fixed width = 0;
css_unit unit = CSS_UNIT_PX;
wtype = css_computed_width(box->style, &width,
&unit);
if (wtype == CSS_WIDTH_AUTO) {
/* max available width may be
* diminished due to floats. */
int x0, x1, top;
struct box *left, *right;
top = cy + max_pos_margin -
max_neg_margin;
top = (top > y) ? top : y;
x0 = cx;
x1 = cx + box->parent->width -
box->parent->padding[LEFT] -
box->parent->padding[RIGHT];
find_sides(block->float_children,
top, top, &x0, &x1,
&left, &right);
/* calculate min required left & right
* margins needed to avoid floats */
lm = x0 - cx;
rm = cx + box->parent->width -
box->parent->padding[LEFT] -
box->parent->padding[RIGHT] -
x1;
}
}
if (!layout_table(box, box->parent->width - lm - rm,
content))
return false;
layout_solve_width(box, box->parent->width, box->width,
lm, rm, -1, -1);
}
/* Position box: horizontal. */
box->x = box->parent->padding[LEFT] + box->margin[LEFT] +
box->border[LEFT].width;
cx += box->x;
/* Position box: vertical. */
if (box->border[TOP].width) {
box->y += box->border[TOP].width;
cy += box->border[TOP].width;
}
/* Vertical margin */
if (((box->type == BOX_BLOCK &&
(box->flags & HAS_HEIGHT)) ||
box->type == BOX_TABLE ||
(box->type == BOX_INLINE_CONTAINER &&
box != box->parent->children) ||
margin_collapse == box) &&
in_margin == true) {
/* Margin goes above this box. */
cy += max_pos_margin - max_neg_margin;
box->y += max_pos_margin - max_neg_margin;
/* Current margin has been applied. */
in_margin = false;
max_pos_margin = max_neg_margin = 0;
}
/* Handle clearance */
if (box->type != BOX_INLINE_CONTAINER &&
(y > 0) && (cy < y)) {
/* box clears something*/
box->y += y - cy;
cy = y;
}
/* Unless the box has an overflow style of visible, the box
* establishes a new block context. */
if (box->type == BOX_BLOCK && box->style &&
(overflow_x != CSS_OVERFLOW_VISIBLE ||
overflow_y != CSS_OVERFLOW_VISIBLE)) {
layout_block_context(box, viewport_height, content);
cy += box->padding[TOP];
if (box->height == AUTO) {
box->height = 0;
layout_block_add_scrollbar(box, BOTTOM);
}
cx -= box->x;
cy += box->height + box->padding[BOTTOM] +
box->border[BOTTOM].width;
y = box->y + box->padding[TOP] + box->height +
box->padding[BOTTOM] +
box->border[BOTTOM].width;
/* Skip children, because they are done in the new
* block context */
goto advance_to_next_box;
}
#ifdef LAYOUT_DEBUG
LOG(("box %p, cx %i, cy %i", box, cx, cy));
#endif
/* Layout (except tables). */
if (box->object) {
if (!layout_block_object(box))
return false;
} else if (box->type == BOX_INLINE_CONTAINER) {
box->width = box->parent->width;
if (!layout_inline_container(box, box->width, block,
cx, cy, content))
return false;
} else if (box->type == BOX_TABLE) {
/* Move down to avoid floats if necessary. */
int x0, x1;
struct box *left, *right;
y = cy;
while (1) {
enum css_width_e wtype;
css_fixed width = 0;
css_unit unit = CSS_UNIT_PX;
wtype = css_computed_width(box->style,
&width, &unit);
x0 = cx;
x1 = cx + box->parent->width;
find_sides(block->float_children, y,
y + box->height,
&x0, &x1, &left, &right);
if (wtype == CSS_WIDTH_AUTO)
break;
if (box->width <= x1 - x0)
break;
if (!left && !right)
break;
else if (!left)
y = right->y + right->height + 1;
else if (!right)
y = left->y + left->height + 1;
else if (left->y + left->height <
right->y + right->height)
y = left->y + left->height + 1;
else
y = right->y + right->height + 1;
}
box->x += x0 - cx;
cx = x0;
box->y += y - cy;
cy = y;
}
/* Advance to next box. */
if (box->type == BOX_BLOCK && !box->object && !(box->iframe) &&
box->children) {
/* Down into children. */
if (box == margin_collapse) {
/* Current margin collapsed though to this box.
* Unset margin_collapse. */
margin_collapse = NULL;
}
y = box->padding[TOP];
box = box->children;
box->y = y;
cy += y;
continue;
} else if (box->type == BOX_BLOCK || box->object ||
box->flags & IFRAME)
cy += box->padding[TOP];
if (box->type == BOX_BLOCK && box->height == AUTO) {
box->height = 0;
layout_block_add_scrollbar(box, BOTTOM);
}
cy += box->height + box->padding[BOTTOM] +
box->border[BOTTOM].width;
cx -= box->x;
y = box->y + box->padding[TOP] + box->height +
box->padding[BOTTOM] +
box->border[BOTTOM].width;
advance_to_next_box:
if (!box->next) {
/* No more siblings:
* up to first ancestor with a sibling. */
do {
if (box == margin_collapse) {
/* Current margin collapsed though to
* this box. Unset margin_collapse. */
margin_collapse = NULL;
}
/* Apply bottom margin */
if (max_pos_margin < box->margin[BOTTOM])
max_pos_margin = box->margin[BOTTOM];
else if (max_neg_margin < -box->margin[BOTTOM])
max_neg_margin = -box->margin[BOTTOM];
box = box->parent;
if (box == block)
break;
/* Margin is invalidated if this is a box
* margins can't collapse through. */
if (box->type == BOX_BLOCK &&
box->flags & MAKE_HEIGHT) {
margin_collapse = NULL;
in_margin = false;
max_pos_margin = max_neg_margin = 0;
}
if (box->height == AUTO) {
box->height = y - box->padding[TOP];
if (box->type == BOX_BLOCK)
layout_block_add_scrollbar(box,
BOTTOM);
} else
cy += box->height -
(y - box->padding[TOP]);
/* Apply any min-height and max-height to
* boxes in normal flow */
if (box->style &&
css_computed_position(box->style) !=
CSS_POSITION_ABSOLUTE &&
layout_apply_minmax_height(box,
NULL)) {
/* Height altered */
/* Set current cy */
cy += box->height -
(y - box->padding[TOP]);
}
cy += box->padding[BOTTOM] +
box->border[BOTTOM].width;
cx -= box->x;
y = box->y + box->padding[TOP] + box->height +
box->padding[BOTTOM] +
box->border[BOTTOM].width;
} while (box->next == NULL);
if (box == block)
break;
}
/* To next sibling. */
if (box == margin_collapse) {
/* Current margin collapsed though to this box.
* Unset margin_collapse. */
margin_collapse = NULL;
}
if (max_pos_margin < box->margin[BOTTOM])
max_pos_margin = box->margin[BOTTOM];
else if (max_neg_margin < -box->margin[BOTTOM])
max_neg_margin = -box->margin[BOTTOM];
box = box->next;
box->y = y;
}
/* Account for bottom margin of last contained block */
cy += max_pos_margin - max_neg_margin;
/* Increase height to contain any floats inside (CSS 2.1 10.6.7). */
for (box = block->float_children; box; box = box->next_float) {
y = box->y + box->height + box->padding[BOTTOM] +
box->border[BOTTOM].width + box->margin[BOTTOM];
if (cy < y)
cy = y;
}
if (block->height == AUTO) {
block->height = cy - block->padding[TOP];
if (block->type == BOX_BLOCK)
layout_block_add_scrollbar(block, BOTTOM);
}
if (block->style && css_computed_position(block->style) !=
CSS_POSITION_ABSOLUTE) {
/* Block is in normal flow */
layout_apply_minmax_height(block, NULL);
}
if (block->gadget &&
(block->gadget->type == GADGET_TEXTAREA ||
block->gadget->type == GADGET_PASSWORD ||
block->gadget->type == GADGET_TEXTBOX)) {
int ta_width = block->padding[LEFT] + block->width +
block->padding[RIGHT];
int ta_height = block->padding[TOP] + block->height +
block->padding[BOTTOM];
textarea_set_layout(block->gadget->data.text.ta,
ta_width, ta_height,
block->padding[TOP], block->padding[RIGHT],
block->padding[BOTTOM], block->padding[LEFT]);
}
return true;
}
/**
* Calculate minimum and maximum width of a block.
*
* \param block box of type BLOCK, INLINE_BLOCK, or TABLE_CELL
* \post block->min_width and block->max_width filled in,
* 0 <= block->min_width <= block->max_width
*/
void layout_minmax_block(struct box *block,
const struct font_functions *font_func)
{
struct box *child;
int min = 0, max = 0;
int extra_fixed = 0;
float extra_frac = 0;
enum css_width_e wtype = CSS_WIDTH_AUTO;
css_fixed width = 0;
css_unit wunit = CSS_UNIT_PX;
enum css_height_e htype = CSS_HEIGHT_AUTO;
css_fixed height = 0;
css_unit hunit = CSS_UNIT_PX;
bool child_has_height = false;
assert(block->type == BOX_BLOCK ||
block->type == BOX_INLINE_BLOCK ||
block->type == BOX_TABLE_CELL);
/* check if the widths have already been calculated */
if (block->max_width != UNKNOWN_MAX_WIDTH)
return;
if (block->style != NULL) {
wtype = css_computed_width(block->style, &width, &wunit);
htype = css_computed_height(block->style, &height, &hunit);
}
/* set whether the minimum width is of any interest for this box */
if (((block->parent && (block->parent->type == BOX_FLOAT_LEFT ||
block->parent->type == BOX_FLOAT_RIGHT)) ||
block->type == BOX_INLINE_BLOCK) &&
wtype != CSS_WIDTH_SET) {
/* box shrinks to fit; need minimum width */
block->flags |= NEED_MIN;
} else if (block->type == BOX_TABLE_CELL) {
/* box shrinks to fit; need minimum width */
block->flags |= NEED_MIN;
} else if (block->parent && (block->parent->flags & NEED_MIN) &&
wtype != CSS_WIDTH_SET) {
/* box inside shrink-to-fit context; need minimum width */
block->flags |= NEED_MIN;
}
if (block->gadget && (block->gadget->type == GADGET_TEXTBOX ||
block->gadget->type == GADGET_PASSWORD ||
block->gadget->type == GADGET_FILE ||
block->gadget->type == GADGET_TEXTAREA) &&
block->style && wtype == CSS_WIDTH_AUTO) {
css_fixed size = INTTOFIX(10);
css_unit unit = CSS_UNIT_EM;
min = max = FIXTOINT(nscss_len2px(size, unit, block->style));
block->flags |= HAS_HEIGHT;
}
if (block->gadget && (block->gadget->type == GADGET_RADIO ||
block->gadget->type == GADGET_CHECKBOX) &&
block->style && wtype == CSS_WIDTH_AUTO) {
css_fixed size = INTTOFIX(1);
css_unit unit = CSS_UNIT_EM;
/* form checkbox or radio button
* if width is AUTO, set it to 1em */
min = max = FIXTOINT(nscss_len2px(size, unit, block->style));
block->flags |= HAS_HEIGHT;
}
if (block->object) {
if (content_get_type(block->object) == CONTENT_HTML) {
layout_minmax_block(html_get_box_tree(block->object),
font_func);
min = html_get_box_tree(block->object)->min_width;
max = html_get_box_tree(block->object)->max_width;
} else {
min = max = content_get_width(block->object);
}
block->flags |= HAS_HEIGHT;
} else if (block->flags & IFRAME) {
/** TODO: do we need to know the min/max width of the iframe's
* content? */
block->flags |= HAS_HEIGHT;
} else {
/* recurse through children */
for (child = block->children; child; child = child->next) {
switch (child->type) {
case BOX_BLOCK:
layout_minmax_block(child, font_func);
if (child->flags & HAS_HEIGHT)
child_has_height = true;
break;
case BOX_INLINE_CONTAINER:
if (block->flags & NEED_MIN)
child->flags |= NEED_MIN;
layout_minmax_inline_container(child,
&child_has_height, font_func);
if (child_has_height &&
child ==
child->parent->children) {
block->flags |= MAKE_HEIGHT;
}
break;
case BOX_TABLE:
layout_minmax_table(child, font_func);
/* todo: fix for zero height tables */
child_has_height = true;
child->flags |= MAKE_HEIGHT;
break;
default:
assert(0);
}
assert(child->max_width != UNKNOWN_MAX_WIDTH);
if (child->style &&
(css_computed_position(child->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(child->style) ==
CSS_POSITION_FIXED)) {
/* This child is positioned out of normal flow,
* so it will have no affect on width */
continue;
}
if (min < child->min_width)
min = child->min_width;
if (max < child->max_width)
max = child->max_width;
if (child_has_height)
block->flags |= HAS_HEIGHT;
}
}
if (max < min) {
box_dump(stderr, block, 0, true);
assert(0);
}
/* fixed width takes priority */
if (block->type != BOX_TABLE_CELL && wtype == CSS_WIDTH_SET &&
wunit != CSS_UNIT_PCT) {
min = max = FIXTOINT(nscss_len2px(width, wunit, block->style));
}
if (htype == CSS_HEIGHT_SET && hunit != CSS_UNIT_PCT &&
height > INTTOFIX(0)) {
block->flags |= MAKE_HEIGHT;
block->flags |= HAS_HEIGHT;
}
/* add margins, border, padding to min, max widths */
/* Note: we don't know available width here so percentage margin
* and paddings are wrong. */
if (block->gadget && wtype == CSS_WIDTH_SET &&
(block->gadget->type == GADGET_SUBMIT ||
block->gadget->type == GADGET_RESET ||
block->gadget->type == GADGET_BUTTON)) {
/* some gadgets with specified width already include border and
* padding, so just get margin */
calculate_mbp_width(block->style, LEFT, true, false, false,
&extra_fixed, &extra_frac);
calculate_mbp_width(block->style, RIGHT, true, false, false,
&extra_fixed, &extra_frac);
} else {
calculate_mbp_width(block->style, LEFT, true, true, true,
&extra_fixed, &extra_frac);
calculate_mbp_width(block->style, RIGHT, true, true, true,
&extra_fixed, &extra_frac);
}
if (extra_fixed < 0)
extra_fixed = 0;
if (extra_frac < 0)
extra_frac = 0;
if (1.0 <= extra_frac)
extra_frac = 0.9;
if (block->style != NULL &&
(css_computed_float(block->style) == CSS_FLOAT_LEFT ||
css_computed_float(block->style) == CSS_FLOAT_RIGHT)) {
/* floated boxs */
block->min_width = min + extra_fixed;
block->max_width = max + extra_fixed;
} else {
/* not floated */
block->min_width = (min + extra_fixed) / (1.0 - extra_frac);
block->max_width = (max + extra_fixed) / (1.0 - extra_frac);
}
assert(0 <= block->min_width && block->min_width <= block->max_width);
}
/**
* Find next block that current margin collapses to.
*
* \param box box to start tree-order search from (top margin is included)
* \param block box responsible for current block fromatting context
* \param viewport_height height of viewport in px
* \param max_pos_margin updated to to maximum positive margin encountered
* \param max_neg_margin updated to to maximum negative margin encountered
* \return next box that current margin collapses to, or NULL if none.
*/
struct box* layout_next_margin_block(struct box *box, struct box *block,
int viewport_height, int *max_pos_margin, int *max_neg_margin)
{
assert(block != NULL);
while (box != NULL) {
if (box->type == BOX_INLINE_CONTAINER || (box->style &&
(css_computed_position(box->style) !=
CSS_POSITION_ABSOLUTE &&
css_computed_position(box->style) !=
CSS_POSITION_FIXED))) {
/* Not positioned */
/* Get margins */
if (box->style) {
layout_find_dimensions(box->parent->width,
viewport_height, box,
box->style,
NULL, NULL, NULL, NULL,
NULL, NULL, box->margin,
box->padding, box->border);
/* Apply top margin */
if (*max_pos_margin < box->margin[TOP])
*max_pos_margin = box->margin[TOP];
else if (*max_neg_margin < -box->margin[TOP])
*max_neg_margin = -box->margin[TOP];
}
/* Check whether box is the box current margin collapses
* to */
if (box->flags & MAKE_HEIGHT ||
box->border[TOP].width ||
box->padding[TOP] ||
(box->style &&
css_computed_overflow_y(box->style) !=
CSS_OVERFLOW_VISIBLE) ||
(box->type == BOX_INLINE_CONTAINER &&
box != box->parent->children)) {
/* Collapse to this box; return it */
return box;
}
}
/* Find next box */
if (box->type == BOX_BLOCK && !box->object && box->children &&
box->style &&
css_computed_overflow_y(box->style) ==
CSS_OVERFLOW_VISIBLE) {
/* Down into children. */
box = box->children;
} else {
if (!box->next) {
/* No more siblings:
* Go up to first ancestor with a sibling. */
do {
/* Apply bottom margin */
if (*max_pos_margin <
box->margin[BOTTOM])
*max_pos_margin =
box->margin[BOTTOM];
else if (*max_neg_margin <
-box->margin[BOTTOM])
*max_neg_margin =
-box->margin[BOTTOM];
box = box->parent;
} while (box != block && !box->next);
if (box == block) {
/* Margins don't collapse with stuff
* outside the block formatting context
*/
return block;
}
}
/* Apply bottom margin */
if (*max_pos_margin < box->margin[BOTTOM])
*max_pos_margin = box->margin[BOTTOM];
else if (*max_neg_margin < -box->margin[BOTTOM])
*max_neg_margin = -box->margin[BOTTOM];
/* To next sibling. */
box = box->next;
/* Get margins */
if (box->style) {
layout_find_dimensions(box->parent->width,
viewport_height, box,
box->style,
NULL, NULL, NULL, NULL,
NULL, NULL, box->margin,
box->padding, box->border);
}
}
}
return NULL;
}
/**
* Layout a block which contains an object.
*
* \param block box of type BLOCK, INLINE_BLOCK, TABLE, or TABLE_CELL
* \return true on success, false on memory exhaustion
*/
bool layout_block_object(struct box *block)
{
assert(block);
assert(block->type == BOX_BLOCK ||
block->type == BOX_INLINE_BLOCK ||
block->type == BOX_TABLE ||
block->type == BOX_TABLE_CELL);
assert(block->object);
#ifdef LAYOUT_DEBUG
LOG(("block %p, object %s, width %i", block,
hlcache_handle_get_url(block->object), block->width));
#endif
if (content_get_type(block->object) == CONTENT_HTML) {
content_reformat(block->object, false, block->width, 1);
} else {
/* Non-HTML objects */
/* this case handled already in
* layout_block_find_dimensions() */
}
return true;
}
/**
* Compute the size of replaced boxes with auto dimensions, according to
* content.
*
* \param box Box with object
* \param width Width value in px or AUTO. If AUTO, updated to value in px.
* \param height Height value in px or AUTO. If AUTO, updated to value in px.
* \param min_width Box's min width, as given by layout_find_dimensions.
* \param max_width Box's max width, as given by layout_find_dimensions.
* \param min_height Box's min height, as given by layout_find_dimensions.
* \param max_height Box's max height, as given by layout_find_dimensions.
*
* See CSS 2.1 sections 10.3 and 10.6.
*/
void layout_get_object_dimensions(struct box *box, int *width, int *height,
int min_width, int max_width, int min_height, int max_height)
{
assert(box->object != NULL);
assert(width != NULL && height != NULL);
if (*width == AUTO && *height == AUTO) {
/* No given dimensions */
bool scaled = false;
int intrinsic_width = content_get_width(box->object);
int intrinsic_height = content_get_height(box->object);
/* use intrinsic dimensions */
*width = intrinsic_width;
*height = intrinsic_height;
/* Deal with min/max-width first */
if (min_width > 0 && min_width > *width) {
*width = min_width;
scaled = true;
}
if (max_width >= 0 && max_width < *width) {
*width = max_width;
scaled = true;
}
if (scaled && (intrinsic_width != 0)) {
/* Update height */
*height = (*width * intrinsic_height) /
intrinsic_width;
}
scaled = false;
/* Deal with min/max-height */
if (min_height > 0 && min_height > *height) {
*height = min_height;
scaled = true;
}
if (max_height >= 0 && max_height < *height) {
*height = max_height;
scaled = true;
}
if (scaled && (intrinsic_height != 0)) {
/* Update width */
*width = (*height * intrinsic_width) /
intrinsic_height;
}
} else if (*width == AUTO) {
/* Have given height; width is calculated from the given height
* and ratio of intrinsic dimensions */
int intrinsic_width = content_get_width(box->object);
int intrinsic_height = content_get_height(box->object);
if (intrinsic_height != 0)
*width = (*height * intrinsic_width) /
intrinsic_height;
else
*width = intrinsic_width;
if (min_width > 0 && min_width > *width)
*width = min_width;
if (max_width >= 0 && max_width < *width)
*width = max_width;
} else if (*height == AUTO) {
/* Have given width; height is calculated from the given width
* and ratio of intrinsic dimensions */
int intrinsic_width = content_get_width(box->object);
int intrinsic_height = content_get_height(box->object);
if (intrinsic_width != 0)
*height = (*width * intrinsic_height) /
intrinsic_width;
else
*height = intrinsic_height;
}
}
/**
* Compute dimensions of box, margins, paddings, and borders for a block-level
* element.
*
* \param available_width Max width available in pixels
* \param viewport_height Height of viewport in pixels or -ve if unknown
* \param lm min left margin required to avoid floats in px.
* zero if not applicable
* \param rm min right margin required to avoid floats in px.
* zero if not applicable
* \param box box to find dimensions of. updated with new width,
* height, margins, borders and paddings
*
* See CSS 2.1 10.3.3, 10.3.4, 10.6.2, and 10.6.3.
*/
void layout_block_find_dimensions(int available_width, int viewport_height,
int lm, int rm, struct box *box)
{
int width, max_width, min_width;
int height, max_height, min_height;
int *margin = box->margin;
int *padding = box->padding;
struct box_border *border = box->border;
const css_computed_style *style = box->style;
layout_find_dimensions(available_width, viewport_height, box, style,
&width, &height, &max_width, &min_width,
&max_height, &min_height, margin, padding, border);
if (box->object && !(box->flags & REPLACE_DIM) &&
content_get_type(box->object) != CONTENT_HTML) {
/* block-level replaced element, see 10.3.4 and 10.6.2 */
layout_get_object_dimensions(box, &width, &height,
min_width, max_width, min_height, max_height);
}
box->width = layout_solve_width(box, available_width, width, lm, rm,
max_width, min_width);
box->height = height;
if (margin[TOP] == AUTO)
margin[TOP] = 0;
if (margin[BOTTOM] == AUTO)
margin[BOTTOM] = 0;
}
/**
* Manimpulate box height according to CSS min-height and max-height properties
*
* \param box block to modify with any min-height or max-height
* \param container containing block for absolutely positioned elements, or
* NULL for non absolutely positioned elements.
* \return whether the height has been changed
*/
bool layout_apply_minmax_height(struct box *box, struct box *container)
{
int h;
struct box *containing_block = NULL;
bool updated = false;
/* Find containing block for percentage heights */
if (box->style != NULL && css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE) {
/* Box is absolutely positioned */
assert(container);
containing_block = container;
} else if (box->float_container && box->style != NULL &&
(css_computed_float(box->style) == CSS_FLOAT_LEFT ||
css_computed_float(box->style) == CSS_FLOAT_RIGHT)) {
/* Box is a float */
assert(box->parent && box->parent->parent &&
box->parent->parent->parent);
containing_block = box->parent->parent->parent;
} else if (box->parent && box->parent->type != BOX_INLINE_CONTAINER) {
/* Box is a block level element */
containing_block = box->parent;
} else if (box->parent && box->parent->type == BOX_INLINE_CONTAINER) {
/* Box is an inline block */
assert(box->parent->parent);
containing_block = box->parent->parent;
}
if (box->style) {
enum css_height_e htype = CSS_HEIGHT_AUTO;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
if (containing_block) {
htype = css_computed_height(containing_block->style,
&value, &unit);
}
/* max-height */
if (css_computed_max_height(box->style, &value, &unit) ==
CSS_MAX_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
if (containing_block &&
containing_block->height != AUTO &&
(css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE ||
htype == CSS_HEIGHT_SET)) {
/* Box is absolutely positioned or its
* containing block has a valid
* specified height. (CSS 2.1
* Section 10.5) */
h = FPCT_OF_INT_TOINT(value,
containing_block->height);
if (h < box->height) {
box->height = h;
updated = true;
}
}
} else {
h = FIXTOINT(nscss_len2px(value, unit,
box->style));
if (h < box->height) {
box->height = h;
updated = true;
}
}
}
/* min-height */
if (css_computed_min_height(box->style, &value, &unit) ==
CSS_MIN_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
if (containing_block &&
containing_block->height != AUTO &&
(css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE ||
htype == CSS_HEIGHT_SET)) {
/* Box is absolutely positioned or its
* containing block has a valid
* specified height. (CSS 2.1
* Section 10.5) */
h = FPCT_OF_INT_TOINT(value,
containing_block->height);
if (h > box->height) {
box->height = h;
updated = true;
}
}
} else {
h = FIXTOINT(nscss_len2px(value, unit,
box->style));
if (h > box->height) {
box->height = h;
updated = true;
}
}
}
}
return updated;
}
/**
* Manipulate a block's [RB]padding/height/width to accommodate scrollbars
*
* \param box Box to apply scrollbar space too. Must be BOX_BLOCK.
* \param which Which scrollbar to make space for. Must be RIGHT or BOTTOM.
*/
void layout_block_add_scrollbar(struct box *box, int which)
{
enum css_overflow_e overflow_x, overflow_y;
assert(box->type == BOX_BLOCK && (which == RIGHT || which == BOTTOM));
if (box->style == NULL)
return;
overflow_x = css_computed_overflow_x(box->style);
overflow_y = css_computed_overflow_y(box->style);
if (which == BOTTOM &&
(overflow_x == CSS_OVERFLOW_SCROLL ||
overflow_x == CSS_OVERFLOW_AUTO ||
(box->object &&
content_get_type(box->object) == CONTENT_HTML))) {
/* make space for scrollbar, unless height is AUTO */
if (box->height != AUTO &&
(overflow_x == CSS_OVERFLOW_SCROLL ||
box_hscrollbar_present(box))) {
box->padding[BOTTOM] += SCROLLBAR_WIDTH;
}
} else if (which == RIGHT &&
(overflow_y == CSS_OVERFLOW_SCROLL ||
overflow_y == CSS_OVERFLOW_AUTO ||
(box->object &&
content_get_type(box->object) == CONTENT_HTML))) {
/* make space for scrollbars, unless width is AUTO */
enum css_height_e htype;
css_fixed height = 0;
css_unit hunit = CSS_UNIT_PX;
htype = css_computed_height(box->style, &height, &hunit);
if (which == RIGHT && box->width != AUTO &&
htype == CSS_HEIGHT_SET &&
(overflow_y == CSS_OVERFLOW_SCROLL ||
box_vscrollbar_present(box))) {
box->width -= SCROLLBAR_WIDTH;
box->padding[RIGHT] += SCROLLBAR_WIDTH;
}
}
}
/**
* Solve the width constraint as given in CSS 2.1 section 10.3.3.
*
* \param box Box to solve constraint for
* \param available_width Max width available in pixels
* \param width Current box width
* \param lm Min left margin required to avoid floats in px.
* zero if not applicable
* \param rm Min right margin required to avoid floats in px.
* zero if not applicable
* \param max_width Box max-width ( -ve means no max-width to apply)
* \param min_width Box min-width ( <=0 means no min-width to apply)
* \return New box width
*
* \post \a box's left/right margins will be updated.
*/
int layout_solve_width(struct box *box, int available_width, int width,
int lm, int rm, int max_width, int min_width)
{
bool auto_width = false;
/* Increase specified left/right margins */
if (box->margin[LEFT] != AUTO && box->margin[LEFT] < lm &&
box->margin[LEFT] >= 0)
box->margin[LEFT] = lm;
if (box->margin[RIGHT] != AUTO && box->margin[RIGHT] < rm &&
box->margin[RIGHT] >= 0)
box->margin[RIGHT] = rm;
/* Find width */
if (width == AUTO) {
/* any other 'auto' become 0 or the minimum required values */
if (box->margin[LEFT] == AUTO)
box->margin[LEFT] = lm;
if (box->margin[RIGHT] == AUTO)
box->margin[RIGHT] = rm;
width = available_width -
(box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] + box->padding[RIGHT] +
box->border[RIGHT].width + box->margin[RIGHT]);
width = width < 0 ? 0 : width;
auto_width = true;
}
if (max_width >= 0 && width > max_width) {
/* max-width is admissable and width exceeds max-width */
width = max_width;
auto_width = false;
}
if (min_width > 0 && width < min_width) {
/* min-width is admissable and width is less than max-width */
width = min_width;
auto_width = false;
}
/* Width was auto, and unconstrained by min/max width, so we're done */
if (auto_width)
return width;
/* Width was not auto, or was constrained by min/max width
* Need to compute left/right margins */
/* HTML alignment (only applies to over-constrained boxes) */
if (box->margin[LEFT] != AUTO && box->margin[RIGHT] != AUTO &&
box->parent != NULL && box->parent->style != NULL) {
switch (css_computed_text_align(box->parent->style)) {
case CSS_TEXT_ALIGN_LIBCSS_RIGHT:
box->margin[LEFT] = AUTO;
box->margin[RIGHT] = 0;
break;
case CSS_TEXT_ALIGN_LIBCSS_CENTER:
box->margin[LEFT] = box->margin[RIGHT] = AUTO;
break;
case CSS_TEXT_ALIGN_LIBCSS_LEFT:
box->margin[LEFT] = 0;
box->margin[RIGHT] = AUTO;
break;
default:
/* Leave it alone; no HTML alignment */
break;
}
}
if (box->margin[LEFT] == AUTO && box->margin[RIGHT] == AUTO) {
/* make the margins equal, centering the element */
box->margin[LEFT] = box->margin[RIGHT] =
(available_width - lm - rm -
(box->border[LEFT].width + box->padding[LEFT] +
width + box->padding[RIGHT] +
box->border[RIGHT].width)) / 2;
if (box->margin[LEFT] < 0) {
box->margin[RIGHT] += box->margin[LEFT];
box->margin[LEFT] = 0;
}
box->margin[LEFT] += lm;
} else if (box->margin[LEFT] == AUTO) {
box->margin[LEFT] = available_width - lm -
(box->border[LEFT].width + box->padding[LEFT] +
width + box->padding[RIGHT] +
box->border[RIGHT].width + box->margin[RIGHT]);
box->margin[LEFT] = box->margin[LEFT] < lm
? lm : box->margin[LEFT];
} else {
/* margin-right auto or "over-constrained" */
box->margin[RIGHT] = available_width - rm -
(box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] + width +
box->padding[RIGHT] +
box->border[RIGHT].width);
}
return width;
}
/**
* Compute dimensions of box, margins, paddings, and borders for a floating
* element using shrink-to-fit. Also used for inline-blocks.
*
* \param available_width Max width available in pixels
* \param style Box's style
* \param box Box for which to find dimensions
* Box margins, borders, paddings, width and
* height are updated.
*/
void layout_float_find_dimensions(int available_width,
const css_computed_style *style, struct box *box)
{
int width, height, max_width, min_width, max_height, min_height;
int *margin = box->margin;
int *padding = box->padding;
struct box_border *border = box->border;
enum css_overflow_e overflow_x = css_computed_overflow_x(style);
enum css_overflow_e overflow_y = css_computed_overflow_y(style);
int scrollbar_width_x =
(overflow_x == CSS_OVERFLOW_SCROLL ||
overflow_x == CSS_OVERFLOW_AUTO) ?
SCROLLBAR_WIDTH : 0;
int scrollbar_width_y =
(overflow_y == CSS_OVERFLOW_SCROLL ||
overflow_y == CSS_OVERFLOW_AUTO) ?
SCROLLBAR_WIDTH : 0;
layout_find_dimensions(available_width, -1, box, style, &width, &height,
&max_width, &min_width, &max_height, &min_height,
margin, padding, border);
if (margin[LEFT] == AUTO)
margin[LEFT] = 0;
if (margin[RIGHT] == AUTO)
margin[RIGHT] = 0;
if (box->gadget == NULL) {
padding[RIGHT] += scrollbar_width_y;
padding[BOTTOM] += scrollbar_width_x;
}
if (box->object && !(box->flags & REPLACE_DIM) &&
content_get_type(box->object) != CONTENT_HTML) {
/* Floating replaced element, with intrinsic width or height.
* See 10.3.6 and 10.6.2 */
layout_get_object_dimensions(box, &width, &height,
min_width, max_width, min_height, max_height);
} else if (box->gadget && (box->gadget->type == GADGET_TEXTBOX ||
box->gadget->type == GADGET_PASSWORD ||
box->gadget->type == GADGET_FILE ||
box->gadget->type == GADGET_TEXTAREA)) {
css_fixed size = 0;
css_unit unit = CSS_UNIT_EM;
/* Give sensible dimensions to gadgets, with auto width/height,
* that don't shrink to fit contained text. */
assert(box->style);
if (box->gadget->type == GADGET_TEXTBOX ||
box->gadget->type == GADGET_PASSWORD ||
box->gadget->type == GADGET_FILE) {
if (width == AUTO) {
size = INTTOFIX(10);
width = FIXTOINT(nscss_len2px(size, unit,
box->style));
}
if (box->gadget->type == GADGET_FILE &&
height == AUTO) {
size = FLTTOFIX(1.5);
height = FIXTOINT(nscss_len2px(size, unit,
box->style));
}
}
if (box->gadget->type == GADGET_TEXTAREA) {
if (width == AUTO) {
size = INTTOFIX(10);
width = FIXTOINT(nscss_len2px(size, unit,
box->style));
}
if (height == AUTO) {
size = INTTOFIX(4);
height = FIXTOINT(nscss_len2px(size, unit,
box->style));
}
}
} else if (width == AUTO) {
/* CSS 2.1 section 10.3.5 */
width = min(max(box->min_width, available_width),
box->max_width);
/* width includes margin, borders and padding */
if (width == available_width) {
width -= box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] +
box->padding[RIGHT] +
box->border[RIGHT].width +
box->margin[RIGHT];
} else {
/* width was obtained from a min_width or max_width
* value, so need to use the same method for calculating
* mbp as was used in layout_minmax_block() */
int fixed = 0;
float frac = 0;
calculate_mbp_width(box->style, LEFT, true, true, true,
&fixed, &frac);
calculate_mbp_width(box->style, RIGHT, true, true, true,
&fixed, &frac);
if (fixed < 0)
fixed = 0;
width -= fixed;
}
if (max_width >= 0 && width > max_width) width = max_width;
if (min_width > 0 && width < min_width) width = min_width;
} else {
if (max_width >= 0 && width > max_width) width = max_width;
if (min_width > 0 && width < min_width) width = min_width;
width -= scrollbar_width_y;
}
box->width = width;
box->height = height;
if (margin[TOP] == AUTO)
margin[TOP] = 0;
if (margin[BOTTOM] == AUTO)
margin[BOTTOM] = 0;
}
/**
* Calculate width, height, and thickness of margins, paddings, and borders.
*
* \param available_width width of containing block
* \param viewport_height height of viewport in pixels or -ve if unknown
* \param box current box
* \param style style giving width, height, margins, paddings,
* and borders
* \param width updated to width, may be NULL
* \param height updated to height, may be NULL
* \param max_width updated to max-width, may be NULL
* \param min_width updated to min-width, may be NULL
* \param max_height updated to max-height, may be NULL
* \param min_height updated to min-height, may be NULL
* \param margin[4] filled with margins, may be NULL
* \param padding[4] filled with paddings, may be NULL
* \param border[4] filled with border widths, may be NULL
*/
void layout_find_dimensions(int available_width, int viewport_height,
struct box *box, const css_computed_style *style,
int *width, int *height, int *max_width, int *min_width,
int *max_height, int *min_height, int margin[4], int padding[4],
struct box_border border[4])
{
struct box *containing_block = NULL;
unsigned int i;
bool percentage;
if (width) {
enum css_width_e wtype;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
wtype = css_computed_width(style, &value, &unit);
if (wtype == CSS_WIDTH_SET) {
if (unit == CSS_UNIT_PCT) {
*width = FPCT_OF_INT_TOINT(
value, available_width);
} else {
*width = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
*width = AUTO;
}
/* specified gadget widths include borders and padding in some
* cases */
if (box->gadget && *width != AUTO) {
percentage = unit == CSS_UNIT_PCT;
layout_tweak_form_dimensions(box, percentage,
available_width, true, width);
}
}
if (height) {
enum css_height_e htype;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
htype = css_computed_height(style, &value, &unit);
if (htype == CSS_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
enum css_height_e cbhtype;
if (css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE &&
box->parent) {
/* Box is absolutely positioned */
assert(box->float_container);
containing_block = box->float_container;
} else if (box->float_container &&
css_computed_position(box->style) !=
CSS_POSITION_ABSOLUTE &&
(css_computed_float(box->style) ==
CSS_FLOAT_LEFT ||
css_computed_float(box->style) ==
CSS_FLOAT_RIGHT)) {
/* Box is a float */
assert(box->parent &&
box->parent->parent &&
box->parent->parent->parent);
containing_block =
box->parent->parent->parent;
} else if (box->parent && box->parent->type !=
BOX_INLINE_CONTAINER) {
/* Box is a block level element */
containing_block = box->parent;
} else if (box->parent && box->parent->type ==
BOX_INLINE_CONTAINER) {
/* Box is an inline block */
assert(box->parent->parent);
containing_block = box->parent->parent;
}
if (containing_block) {
css_fixed f = 0;
css_unit u = CSS_UNIT_PX;
cbhtype = css_computed_height(
containing_block->style,
&f, &u);
}
if (containing_block &&
containing_block->height != AUTO &&
(css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE ||
cbhtype == CSS_HEIGHT_SET)) {
/* Box is absolutely positioned or its
* containing block has a valid
* specified height.
* (CSS 2.1 Section 10.5) */
*height = FPCT_OF_INT_TOINT(value,
containing_block->height);
} else if ((!box->parent ||
!box->parent->parent) &&
viewport_height >= 0) {
/* If root element or it's child
* (HTML or BODY) */
*height = FPCT_OF_INT_TOINT(value,
viewport_height);
} else {
/* precentage height not permissible
* treat height as auto */
*height = AUTO;
}
} else {
*height = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
*height = AUTO;
}
/* specified gadget heights include borders and padding in
* some cases */
if (box->gadget && *height != AUTO) {
percentage = unit == CSS_UNIT_PCT;
layout_tweak_form_dimensions(box, percentage,
available_width, false, height);
}
}
if (max_width) {
enum css_max_width_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
type = css_computed_max_width(style, &value, &unit);
if (type == CSS_MAX_WIDTH_SET) {
if (unit == CSS_UNIT_PCT) {
*max_width = FPCT_OF_INT_TOINT(value,
available_width);
} else {
*max_width = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
/* Inadmissible */
*max_width = -1;
}
/* specified gadget widths include borders and padding in some
* cases */
if (box->gadget && *max_width != -1) {
percentage = unit == CSS_UNIT_PCT;
layout_tweak_form_dimensions(box, percentage,
available_width, true, max_width);
}
}
if (min_width) {
enum css_min_width_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
type = css_computed_min_width(style, &value, &unit);
if (type == CSS_MIN_WIDTH_SET) {
if (unit == CSS_UNIT_PCT) {
*min_width = FPCT_OF_INT_TOINT(value,
available_width);
} else {
*min_width = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
/* Inadmissible */
*min_width = 0;
}
/* specified gadget widths include borders and padding in some
* cases */
if (box->gadget && *min_width != 0) {
percentage = unit == CSS_UNIT_PCT;
layout_tweak_form_dimensions(box, percentage,
available_width, true, min_width);
}
}
if (max_height) {
enum css_max_height_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
type = css_computed_max_height(style, &value, &unit);
if (type == CSS_MAX_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
/* TODO: handle percentage */
*max_height = -1;
} else {
*max_height = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
/* Inadmissible */
*max_height = -1;
}
}
if (min_height) {
enum css_min_height_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
type = css_computed_min_height(style, &value, &unit);
if (type == CSS_MIN_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
/* TODO: handle percentage */
*min_height = 0;
} else {
*min_height = FIXTOINT(nscss_len2px(value, unit,
style));
}
} else {
/* Inadmissible */
*min_height = 0;
}
}
for (i = 0; i != 4; i++) {
if (margin) {
enum css_margin_e type = CSS_MARGIN_AUTO;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
switch (i) {
case TOP:
type = css_computed_margin_top(style,
&value, &unit);
break;
case RIGHT:
type = css_computed_margin_right(style,
&value, &unit);
break;
case BOTTOM:
type = css_computed_margin_bottom(style,
&value, &unit);
break;
case LEFT:
type = css_computed_margin_left(style,
&value, &unit);
break;
}
if (type == CSS_MARGIN_SET) {
if (unit == CSS_UNIT_PCT) {
margin[i] = FPCT_OF_INT_TOINT(value,
available_width);
} else {
margin[i] = FIXTOINT(nscss_len2px(value,
unit, style));
}
} else {
margin[i] = AUTO;
}
}
if (padding) {
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
switch (i) {
case TOP:
css_computed_padding_top(style, &value, &unit);
break;
case RIGHT:
css_computed_padding_right(style, &value,
&unit);
break;
case BOTTOM:
css_computed_padding_bottom(style, &value,
&unit);
break;
case LEFT:
css_computed_padding_left(style, &value, &unit);
break;
}
if (unit == CSS_UNIT_PCT) {
padding[i] = FPCT_OF_INT_TOINT(value,
available_width);
} else {
padding[i] = FIXTOINT(nscss_len2px(value, unit,
style));
}
}
/* Table cell borders are populated in table.c */
if (border && box->type != BOX_TABLE_CELL) {
enum css_border_style_e bstyle = CSS_BORDER_STYLE_NONE;
css_color color = 0;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
switch (i) {
case TOP:
css_computed_border_top_width(style, &value,
&unit);
bstyle = css_computed_border_top_style(style);
css_computed_border_top_color(style, &color);
break;
case RIGHT:
css_computed_border_right_width(style, &value,
&unit);
bstyle = css_computed_border_right_style(style);
css_computed_border_right_color(style, &color);
break;
case BOTTOM:
css_computed_border_bottom_width(style, &value,
&unit);
bstyle = css_computed_border_bottom_style(
style);
css_computed_border_bottom_color(style, &color);
break;
case LEFT:
css_computed_border_left_width(style, &value,
&unit);
bstyle = css_computed_border_left_style(style);
css_computed_border_left_color(style, &color);
break;
}
border[i].style = bstyle;
border[i].c = color;
if (bstyle == CSS_BORDER_STYLE_HIDDEN ||
bstyle == CSS_BORDER_STYLE_NONE)
/* spec unclear: following Mozilla */
border[i].width = 0;
else
border[i].width = FIXTOINT(nscss_len2px(value,
unit, style));
/* Special case for border-collapse: make all borders
* on table/table-row-group/table-row zero width. */
if (css_computed_border_collapse(style) ==
CSS_BORDER_COLLAPSE_COLLAPSE &&
(box->type == BOX_TABLE ||
box->type == BOX_TABLE_ROW_GROUP ||
box->type == BOX_TABLE_ROW))
border[i].width = 0;
}
}
}
/**
* Under some circumstances, specified dimensions for form elements include
* borders and padding.
*
* \param box gadget to adjust dimensions of
* \param percentage whether the gadget has its dimension specified as a
* percentage
* \param available_width width of containing block
* \param setwidth set true if the dimension to be tweaked is a width,
* else set false for a height
* \param dimension current value for given width/height dimension.
* updated to new value after consideration of
* gadget properties.
*/
void layout_tweak_form_dimensions(struct box *box, bool percentage,
int available_width, bool setwidth, int *dimension)
{
int fixed = 0;
float frac = 0;
assert(box && box->gadget);
/* specified gadget widths include borders and padding in some
* cases */
if (percentage || box->gadget->type == GADGET_SUBMIT ||
box->gadget->type == GADGET_RESET ||
box->gadget->type == GADGET_BUTTON) {
calculate_mbp_width(box->style, setwidth ? LEFT : TOP,
false, true, true, &fixed, &frac);
calculate_mbp_width(box->style, setwidth ? RIGHT : BOTTOM,
false, true, true, &fixed, &frac);
*dimension -= frac * available_width + fixed;
*dimension = *dimension > 0 ? *dimension : 0;
}
}
/**
* Find y coordinate which clears all floats on left and/or right.
*
* \param fl first float in float list
* \param clear type of clear
* \return y coordinate relative to ancestor box for floats
*/
int layout_clear(struct box *fl, enum css_clear_e clear)
{
int y = 0;
for (; fl; fl = fl->next_float) {
if ((clear == CSS_CLEAR_LEFT || clear == CSS_CLEAR_BOTH) &&
fl->type == BOX_FLOAT_LEFT)
if (y < fl->y + fl->height)
y = fl->y + fl->height;
if ((clear == CSS_CLEAR_RIGHT || clear == CSS_CLEAR_BOTH) &&
fl->type == BOX_FLOAT_RIGHT)
if (y < fl->y + fl->height)
y = fl->y + fl->height;
}
return y;
}
/**
* Find left and right edges in a vertical range.
*
* \param fl first float in float list
* \param y0 start of y range to search
* \param y1 end of y range to search
* \param x0 start left edge, updated to available left edge
* \param x1 start right edge, updated to available right edge
* \param left returns float on left if present
* \param right returns float on right if present
*/
void find_sides(struct box *fl, int y0, int y1,
int *x0, int *x1, struct box **left, struct box **right)
{
int fy0, fy1, fx0, fx1;
#ifdef LAYOUT_DEBUG
LOG(("y0 %i, y1 %i, x0 %i, x1 %i", y0, y1, *x0, *x1));
#endif
*left = *right = 0;
for (; fl; fl = fl->next_float) {
fy0 = fl->y;
fy1 = fl->y + fl->height;
if (y0 < fy1 && fy0 <= y1) {
if (fl->type == BOX_FLOAT_LEFT) {
fx1 = fl->x + fl->width;
if (*x0 < fx1) {
*x0 = fx1;
*left = fl;
}
} else if (fl->type == BOX_FLOAT_RIGHT) {
fx0 = fl->x;
if (fx0 < *x1) {
*x1 = fx0;
*right = fl;
}
}
}
}
#ifdef LAYOUT_DEBUG
LOG(("x0 %i, x1 %i, left %p, right %p", *x0, *x1, *left, *right));
#endif
}
/**
* Layout lines of text or inline boxes with floats.
*
* \param box inline container
* \param width horizontal space available
* \param cont ancestor box which defines horizontal space, for floats
* \param cx box position relative to cont
* \param cy box position relative to cont
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_inline_container(struct box *inline_container, int width,
struct box *cont, int cx, int cy, html_content *content)
{
bool first_line = true;
bool has_text_children;
struct box *c, *next;
int y = 0;
int curwidth,maxwidth = width;
assert(inline_container->type == BOX_INLINE_CONTAINER);
#ifdef LAYOUT_DEBUG
LOG(("inline_container %p, width %i, cont %p, cx %i, cy %i",
inline_container, width, cont, cx, cy));
#endif
has_text_children = false;
for (c = inline_container->children; c; c = c->next) {
bool is_pre = false;
if (c->style) {
enum css_white_space_e whitespace;
whitespace = css_computed_white_space(c->style);
is_pre = (whitespace == CSS_WHITE_SPACE_PRE ||
whitespace == CSS_WHITE_SPACE_PRE_LINE ||
whitespace == CSS_WHITE_SPACE_PRE_WRAP);
}
if ((!c->object && !(c->flags & REPLACE_DIM) &&
!(c->flags & IFRAME) &&
c->text && (c->length || is_pre)) ||
c->type == BOX_BR)
has_text_children = true;
}
/** \todo fix wrapping so that a box with horizontal scrollbar will
* shrink back to 'width' if no word is wider than 'width' (Or just set
* curwidth = width and have the multiword lines wrap to the min width)
*/
for (c = inline_container->children; c; ) {
#ifdef LAYOUT_DEBUG
LOG(("c %p", c));
#endif
curwidth = inline_container->width;
if (!layout_line(c, &curwidth, &y, cx, cy + y, cont, first_line,
has_text_children, content, &next))
return false;
maxwidth = max(maxwidth,curwidth);
c = next;
first_line = false;
}
inline_container->width = maxwidth;
inline_container->height = y;
return true;
}
/**
* Calculate minimum and maximum width of an inline container.
*
* \param inline_container box of type INLINE_CONTAINER
* \post inline_container->min_width and inline_container->max_width filled in,
* 0 <= inline_container->min_width <= inline_container->max_width
*/
void layout_minmax_inline_container(struct box *inline_container,
bool *has_height, const struct font_functions *font_func)
{
struct box *child;
int line_min = 0, line_max = 0;
int min = 0, max = 0;
bool first_line = true;
bool line_has_height;
assert(inline_container->type == BOX_INLINE_CONTAINER);
/* check if the widths have already been calculated */
if (inline_container->max_width != UNKNOWN_MAX_WIDTH)
return;
*has_height = false;
for (child = inline_container->children; child; ) {
child = layout_minmax_line(child, &line_min, &line_max,
first_line, &line_has_height, font_func);
if (min < line_min)
min = line_min;
if (max < line_max)
max = line_max;
first_line = false;
*has_height |= line_has_height;
}
inline_container->min_width = min;
inline_container->max_width = max;
assert(0 <= inline_container->min_width &&
inline_container->min_width <=
inline_container->max_width);
}
/**
* Calculate line height from a style.
*/
int line_height(const css_computed_style *style)
{
enum css_line_height_e lhtype;
css_fixed lhvalue = 0;
css_unit lhunit = CSS_UNIT_PX;
css_fixed line_height;
assert(style);
lhtype = css_computed_line_height(style, &lhvalue, &lhunit);
if (lhtype == CSS_LINE_HEIGHT_NORMAL) {
/* Normal => use a constant of 1.3 * font-size */
lhvalue = FLTTOFIX(1.3);
lhtype = CSS_LINE_HEIGHT_NUMBER;
}
if (lhtype == CSS_LINE_HEIGHT_NUMBER ||
lhunit == CSS_UNIT_PCT) {
line_height = nscss_len2px(lhvalue, CSS_UNIT_EM, style);
if (lhtype != CSS_LINE_HEIGHT_NUMBER)
line_height = FDIV(line_height, F_100);
} else {
assert(lhunit != CSS_UNIT_PCT);
line_height = nscss_len2px(lhvalue, lhunit, style);
}
return FIXTOINT(line_height);
}
/**
* Split a text box.
*
* \param content memory pool for any new boxes
* \param fstyle style for text in text box
* \param split_box box with text to split
* \param new_length new length for text in split_box, after splitting
* \param new_width new width for text in split_box, after splitting
* \return true on success, false on memory exhaustion
*
* A new box is created and inserted into the box tree after split_box,
* containing the text after new_length excluding the initial space character.
*/
static bool layout_text_box_split(html_content *content,
plot_font_style_t *fstyle, struct box *split_box,
size_t new_length, int new_width)
{
int space_width = split_box->space;
struct box *c2;
const struct font_functions *font_func = content->font_func;
bool space = (split_box->text[new_length] == ' ');
int used_length = new_length + (space ? 1 : 0);
if ((space && space_width == 0) || space_width == UNKNOWN_WIDTH) {
/* We're need to add a space, and we don't know how big
* it's to be, OR we have a space of unknown width anyway;
* Calculate space width */
font_func->font_width(fstyle, " ", 1, &space_width);
}
if (split_box->space == UNKNOWN_WIDTH)
split_box->space = space_width;
if (!space)
space_width = 0;
/* Create clone of split_box, c2 */
c2 = talloc_memdup(content->bctx, split_box, sizeof *c2);
if (!c2)
return false;
c2->flags |= CLONE;
/* Set remaining text in c2 */
c2->text += used_length;
/* Set c2 according to the remaining text */
c2->width -= new_width + space_width;
c2->flags &= ~MEASURED; /* width has been estimated */
c2->length = split_box->length - used_length;
/* Update split_box for its reduced text */
split_box->width = new_width;
split_box->flags |= MEASURED;
split_box->length = new_length;
split_box->space = space_width;
/* Insert c2 into box list */
c2->next = split_box->next;
split_box->next = c2;
c2->prev = split_box;
if (c2->next)
c2->next->prev = c2;
else
c2->parent->last = c2;
#ifdef LAYOUT_DEBUG
LOG(("split_box %p len: %u \"%.*s\"",
split_box, split_box->length,
split_box->length, split_box->text));
LOG((" new_box %p len: %u \"%.*s\"",
c2, c2->length,
c2->length, c2->text));
#endif
return true;
}
/**
* Position a line of boxes in inline formatting context.
*
* \param first box at start of line
* \param width available width on input, updated with actual width on output
* (may be incorrect if the line gets split?)
* \param y coordinate of top of line, updated on exit to bottom
* \param cx coordinate of left of line relative to cont
* \param cy coordinate of top of line relative to cont
* \param cont ancestor box which defines horizontal space, for floats
* \param indent apply any first-line indent
* \param has_text_children at least one TEXT in the inline_container
* \param next_box updated to first box for next line, or 0 at end
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_line(struct box *first, int *width, int *y,
int cx, int cy, struct box *cont, bool indent,
bool has_text_children,
html_content *content, struct box **next_box)
{
int height, used_height;
int x0 = 0;
int x1 = *width;
int x, h, x_previous;
int fy = cy;
struct box *left;
struct box *right;
struct box *b;
struct box *split_box = 0;
struct box *d;
struct box *br_box = 0;
bool move_y = false;
bool place_below = false;
int space_before = 0, space_after = 0;
unsigned int inline_count = 0;
unsigned int i;
const struct font_functions *font_func = content->font_func;
plot_font_style_t fstyle;
#ifdef LAYOUT_DEBUG
LOG(("first %p, first->text '%.*s', width %i, y %i, cx %i, cy %i",
first, (int) first->length, first->text, *width,
*y, cx, cy));
#endif
/* find sides at top of line */
x0 += cx;
x1 += cx;
find_sides(cont->float_children, cy, cy, &x0, &x1, &left, &right);
x0 -= cx;
x1 -= cx;
if (indent)
x0 += layout_text_indent(first->parent->parent->style, *width);
if (x1 < x0)
x1 = x0;
/* get minimum line height from containing block.
* this is the line-height if there are text children and also in the
* case of an initially empty text input */
if (has_text_children || first->parent->parent->gadget)
used_height = height =
line_height(first->parent->parent->style);
else
/* inline containers with no text are usually for layout and
* look better with no minimum line-height */
used_height = height = 0;
/* pass 1: find height of line assuming sides at top of line: loop
* body executed at least once
* keep in sync with the loop in layout_minmax_line() */
#ifdef LAYOUT_DEBUG
LOG(("x0 %i, x1 %i, x1 - x0 %i", x0, x1, x1 - x0));
#endif
for (x = 0, b = first; x <= x1 - x0 && b != 0; b = b->next) {
int min_width, max_width, min_height, max_height;
assert(b->type == BOX_INLINE || b->type == BOX_INLINE_BLOCK ||
b->type == BOX_FLOAT_LEFT ||
b->type == BOX_FLOAT_RIGHT ||
b->type == BOX_BR || b->type == BOX_TEXT ||
b->type == BOX_INLINE_END);
#ifdef LAYOUT_DEBUG
LOG(("pass 1: b %p, x %i", b, x));
#endif
if (b->type == BOX_BR)
break;
if (b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT)
continue;
if (b->type == BOX_INLINE_BLOCK &&
(css_computed_position(b->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(b->style) ==
CSS_POSITION_FIXED))
continue;
assert(b->style != NULL);
font_plot_style_from_css(b->style, &fstyle);
x += space_after;
if (b->type == BOX_INLINE_BLOCK) {
if (b->max_width != UNKNOWN_WIDTH)
if (!layout_float(b, *width, content))
return false;
h = b->border[TOP].width + b->padding[TOP] + b->height +
b->padding[BOTTOM] +
b->border[BOTTOM].width;
if (height < h)
height = h;
x += b->margin[LEFT] + b->border[LEFT].width +
b->padding[LEFT] + b->width +
b->padding[RIGHT] +
b->border[RIGHT].width +
b->margin[RIGHT];
space_after = 0;
continue;
}
if (b->type == BOX_INLINE) {
/* calculate borders, margins, and padding */
layout_find_dimensions(*width, -1, b, b->style, 0, 0,
0, 0, 0, 0, b->margin, b->padding,
b->border);
for (i = 0; i != 4; i++)
if (b->margin[i] == AUTO)
b->margin[i] = 0;
x += b->margin[LEFT] + b->border[LEFT].width +
b->padding[LEFT];
if (b->inline_end) {
b->inline_end->margin[RIGHT] = b->margin[RIGHT];
b->inline_end->padding[RIGHT] =
b->padding[RIGHT];
b->inline_end->border[RIGHT] =
b->border[RIGHT];
} else {
x += b->padding[RIGHT] +
b->border[RIGHT].width +
b->margin[RIGHT];
}
} else if (b->type == BOX_INLINE_END) {
b->width = 0;
if (b->space == UNKNOWN_WIDTH) {
font_func->font_width(&fstyle, " ", 1,
&b->space);
/** \todo handle errors */
}
space_after = b->space;
x += b->padding[RIGHT] + b->border[RIGHT].width +
b->margin[RIGHT];
continue;
}
if (!b->object && !(b->flags & IFRAME) && !b->gadget &&
!(b->flags & REPLACE_DIM)) {
/* inline non-replaced, 10.3.1 and 10.6.1 */
b->height = line_height(b->style ? b->style :
b->parent->parent->style);
if (height < b->height)
height = b->height;
if (!b->text) {
b->width = 0;
space_after = 0;
continue;
}
if (b->width == UNKNOWN_WIDTH) {
/** \todo handle errors */
/* If it's a select element, we must use the
* width of the widest option text */
if (b->parent->parent->gadget &&
b->parent->parent->gadget->type
== GADGET_SELECT) {
int opt_maxwidth = 0;
struct form_option *o;
for (o = b->parent->parent->gadget->
data.select.items; o;
o = o->next) {
int opt_width;
font_func->font_width(&fstyle,
o->text,
strlen(o->text),
&opt_width);
if (opt_maxwidth < opt_width)
opt_maxwidth =opt_width;
}
b->width = opt_maxwidth;
if (nsoption_bool(core_select_menu))
b->width += SCROLLBAR_WIDTH;
} else {
font_func->font_width(&fstyle, b->text,
b->length, &b->width);
b->flags |= MEASURED;
}
}
/* If the current text has not been measured (i.e. its
* width was estimated after splitting), and it fits on
* the line, measure it properly, so next box is placed
* correctly. */
if (b->text && (x + b->width < x1 - x0) &&
!(b->flags & MEASURED) &&
b->next) {
font_func->font_width(&fstyle, b->text,
b->length, &b->width);
b->flags |= MEASURED;
}
x += b->width;
if (b->space == UNKNOWN_WIDTH) {
font_func->font_width(&fstyle, " ", 1,
&b->space);
/** \todo handle errors */
}
space_after = b->space;
continue;
}
space_after = 0;
/* inline replaced, 10.3.2 and 10.6.2 */
assert(b->style);
layout_find_dimensions(*width, -1, b, b->style,
&b->width, &b->height, &max_width, &min_width,
&max_height, &min_height, NULL, NULL, NULL);
if (b->object && !(b->flags & REPLACE_DIM)) {
layout_get_object_dimensions(b, &b->width, &b->height,
min_width, max_width,
min_height, max_height);
} else if (b->flags & IFRAME) {
/* TODO: should we look at the content dimensions? */
if (b->width == AUTO)
b->width = 400;
if (b->height == AUTO)
b->height = 300;
/* We reformat the iframe browser window to new
* dimensions in pass 2 */
} else {
/* form control with no object */
if (b->width == AUTO)
b->width = FIXTOINT(nscss_len2px(INTTOFIX(1),
CSS_UNIT_EM, b->style));
if (b->height == AUTO)
b->height = FIXTOINT(nscss_len2px(INTTOFIX(1),
CSS_UNIT_EM, b->style));
}
/* Reformat object to new box size */
if (b->object && content_get_type(b->object) == CONTENT_HTML &&
b->width !=
content_get_available_width(b->object)) {
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
enum css_height_e htype = css_computed_height(b->style,
&value, &unit);
content_reformat(b->object, false, b->width, b->height);
if (htype == CSS_HEIGHT_AUTO)
b->height = content_get_height(b->object);
}
if (height < b->height)
height = b->height;
x += b->width;
}
/* find new sides using this height */
x0 = cx;
x1 = cx + *width;
find_sides(cont->float_children, cy, cy + height, &x0, &x1,
&left, &right);
x0 -= cx;
x1 -= cx;
if (indent)
x0 += layout_text_indent(first->parent->parent->style, *width);
if (x1 < x0)
x1 = x0;
space_after = space_before = 0;
/* pass 2: place boxes in line: loop body executed at least once */
#ifdef LAYOUT_DEBUG
LOG(("x0 %i, x1 %i, x1 - x0 %i", x0, x1, x1 - x0));
#endif
for (x = x_previous = 0, b = first; x <= x1 - x0 && b; b = b->next) {
#ifdef LAYOUT_DEBUG
LOG(("pass 2: b %p, x %i", b, x));
#endif
if (b->type == BOX_INLINE_BLOCK &&
(css_computed_position(b->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(b->style) ==
CSS_POSITION_FIXED)) {
b->x = x + space_after;
} else if (b->type == BOX_INLINE ||
b->type == BOX_INLINE_BLOCK ||
b->type == BOX_TEXT ||
b->type == BOX_INLINE_END) {
assert(b->width != UNKNOWN_WIDTH);
x_previous = x;
x += space_after;
b->x = x;
if ((b->type == BOX_INLINE && !b->inline_end) ||
b->type == BOX_INLINE_BLOCK) {
b->x += b->margin[LEFT] + b->border[LEFT].width;
x = b->x + b->padding[LEFT] + b->width +
b->padding[RIGHT] +
b->border[RIGHT].width +
b->margin[RIGHT];
} else if (b->type == BOX_INLINE) {
b->x += b->margin[LEFT] + b->border[LEFT].width;
x = b->x + b->padding[LEFT] + b->width;
} else if (b->type == BOX_INLINE_END) {
b->height = b->inline_end->height;
x += b->padding[RIGHT] +
b->border[RIGHT].width +
b->margin[RIGHT];
} else {
x += b->width;
}
space_before = space_after;
if (b->object || b->flags & REPLACE_DIM ||
b->flags & IFRAME)
space_after = 0;
else if (b->text || b->type == BOX_INLINE_END) {
if (b->space == UNKNOWN_WIDTH) {
font_plot_style_from_css(b->style,
&fstyle);
/** \todo handle errors */
font_func->font_width(&fstyle, " ", 1,
&b->space);
}
space_after = b->space;
} else {
space_after = 0;
}
split_box = b;
move_y = true;
inline_count++;
} else if (b->type == BOX_BR) {
b->x = x;
b->width = 0;
br_box = b;
b = b->next;
split_box = 0;
move_y = true;
break;
} else {
/* float */
#ifdef LAYOUT_DEBUG
LOG(("float %p", b));
#endif
d = b->children;
d->float_children = 0;
b->float_container = d->float_container = cont;
if (!layout_float(d, *width, content))
return false;
#ifdef LAYOUT_DEBUG
LOG(("%p : %d %d", d, d->margin[TOP],
d->border[TOP].width));
#endif
d->x = d->margin[LEFT] + d->border[LEFT].width;
d->y = d->margin[TOP] + d->border[TOP].width;
b->width = d->margin[LEFT] + d->border[LEFT].width +
d->padding[LEFT] + d->width +
d->padding[RIGHT] +
d->border[RIGHT].width +
d->margin[RIGHT];
b->height = d->margin[TOP] + d->border[TOP].width +
d->padding[TOP] + d->height +
d->padding[BOTTOM] +
d->border[BOTTOM].width +
d->margin[BOTTOM];
if (b->width > (x1 - x0) - x)
place_below = true;
if (d->style && (css_computed_clear(d->style) ==
CSS_CLEAR_NONE ||
(css_computed_clear(d->style) ==
CSS_CLEAR_LEFT && left == 0) ||
(css_computed_clear(d->style) ==
CSS_CLEAR_RIGHT &&
right == 0) ||
(css_computed_clear(d->style) ==
CSS_CLEAR_BOTH &&
left == 0 && right == 0)) &&
(!place_below ||
(left == 0 && right == 0 && x == 0)) &&
cy >= cont->clear_level) {
/* + not cleared or,
* cleared and there are no floats to clear
* + fits without needing to be placed below or,
* this line is empty with no floats
* + current y, cy, is below the clear level
*
* Float affects current line */
if (b->type == BOX_FLOAT_LEFT) {
b->x = cx + x0;
if (b->width > 0)
x0 += b->width;
left = b;
} else {
b->x = cx + x1 - b->width;
if (b->width > 0)
x1 -= b->width;
right = b;
}
b->y = cy;
} else {
/* cleared or doesn't fit on line */
/* place below into next available space */
int fcy = (cy > cont->clear_level) ? cy :
cont->clear_level;
fy = (fy > fcy) ? fy : fcy;
fy = (fy == cy) ? fy + height : fy;
place_float_below(b, *width, cx, fy, cont);
fy = b->y;
if (d->style && (
(css_computed_clear(d->style) ==
CSS_CLEAR_LEFT && left != 0) ||
(css_computed_clear(d->style) ==
CSS_CLEAR_RIGHT &&
right != 0) ||
(css_computed_clear(d->style) ==
CSS_CLEAR_BOTH &&
(left != 0 || right != 0)))) {
/* to be cleared below existing
* floats */
if (b->type == BOX_FLOAT_LEFT)
b->x = cx;
else
b->x = cx + *width - b->width;
fcy = layout_clear(cont->float_children,
css_computed_clear(d->style));
if (fcy > cont->clear_level)
cont->clear_level = fcy;
if (b->y < fcy)
b->y = fcy;
}
if (b->type == BOX_FLOAT_LEFT)
left = b;
else
right = b;
}
if (cont->float_children == b) {
#ifdef LAYOUT_DEBUG
LOG(("float %p already placed", b));
#endif
box_dump(stderr, cont, 0, true);
assert(0);
}
b->next_float = cont->float_children;
cont->float_children = b;
split_box = 0;
}
}
if (x1 - x0 < x && split_box) {
/* the last box went over the end */
size_t split = 0;
int w;
bool no_wrap = css_computed_white_space(
split_box->style) == CSS_WHITE_SPACE_NOWRAP ||
css_computed_white_space(
split_box->style) == CSS_WHITE_SPACE_PRE;
x = x_previous;
if (!no_wrap && (split_box->type == BOX_INLINE ||
split_box->type == BOX_TEXT) &&
!split_box->object &&
!(split_box->flags & REPLACE_DIM) &&
!(split_box->flags & IFRAME) &&
!split_box->gadget && split_box->text) {
font_plot_style_from_css(split_box->style, &fstyle);
/** \todo handle errors */
font_func->font_split(&fstyle,
split_box->text, split_box->length,
x1 - x0 - x - space_before, &split, &w);
}
/* split == 0 implies that text can't be split */
if (split == 0)
w = split_box->width;
#ifdef LAYOUT_DEBUG
LOG(("splitting: split_box %p \"%.*s\", spilt %zu, w %i, "
"left %p, right %p, inline_count %u",
split_box, (int) split_box->length,
split_box->text, split, w,
left, right, inline_count));
#endif
if ((split == 0 || x1 - x0 <= x + space_before + w) &&
!left && !right && inline_count == 1) {
/* first word of box doesn't fit, but no floats and
* first box on line so force in */
if (split == 0 || split == split_box->length) {
/* only one word in this box, or not text
* or white-space:nowrap */
b = split_box->next;
} else {
/* cut off first word for this line */
if (!layout_text_box_split(content, &fstyle,
split_box, split, w))
return false;
b = split_box->next;
}
x += space_before + w;
#ifdef LAYOUT_DEBUG
LOG(("forcing"));
#endif
} else if ((split == 0 || x1 - x0 <= x + space_before + w) &&
inline_count == 1) {
/* first word of first box doesn't fit, but a float is
* taking some of the width so move below it */
assert(left || right);
used_height = 0;
if (left) {
#ifdef LAYOUT_DEBUG
LOG(("cy %i, left->y %i, left->height %i",
cy, left->y, left->height));
#endif
used_height = left->y + left->height - cy + 1;
#ifdef LAYOUT_DEBUG
LOG(("used_height %i", used_height));
#endif
}
if (right && used_height <
right->y + right->height - cy + 1)
used_height = right->y + right->height - cy + 1;
if (used_height < 0)
used_height = 0;
b = split_box;
#ifdef LAYOUT_DEBUG
LOG(("moving below float"));
#endif
} else if (split == 0 || x1 - x0 <= x + space_before + w) {
/* first word of box doesn't fit so leave box for next
* line */
b = split_box;
#ifdef LAYOUT_DEBUG
LOG(("leaving for next line"));
#endif
} else {
/* fit as many words as possible */
assert(split != 0);
#ifdef LAYOUT_DEBUG
LOG(("'%.*s' %i %zu %i", (int) split_box->length,
split_box->text, x1 - x0, split, w));
#endif
if (split != split_box->length) {
if (!layout_text_box_split(content, &fstyle,
split_box, split, w))
return false;
b = split_box->next;
}
x += space_before + w;
#ifdef LAYOUT_DEBUG
LOG(("fitting words"));
#endif
}
move_y = true;
}
/* set positions */
switch (css_computed_text_align(first->parent->parent->style)) {
case CSS_TEXT_ALIGN_RIGHT:
case CSS_TEXT_ALIGN_LIBCSS_RIGHT:
x0 = x1 - x;
break;
case CSS_TEXT_ALIGN_CENTER:
case CSS_TEXT_ALIGN_LIBCSS_CENTER:
x0 = (x0 + (x1 - x)) / 2;
break;
case CSS_TEXT_ALIGN_LEFT:
case CSS_TEXT_ALIGN_LIBCSS_LEFT:
case CSS_TEXT_ALIGN_JUSTIFY:
/* leave on left */
break;
case CSS_TEXT_ALIGN_DEFAULT:
/* None; consider text direction */
switch (css_computed_direction(first->parent->parent->style)) {
case CSS_DIRECTION_LTR:
/* leave on left */
break;
case CSS_DIRECTION_RTL:
x0 = x1 - x;
break;
}
break;
}
for (d = first; d != b; d = d->next) {
d->flags &= ~NEW_LINE;
if (d->type == BOX_INLINE_BLOCK &&
(css_computed_position(d->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(d->style) ==
CSS_POSITION_FIXED)) {
/* positioned inline-blocks:
* set static position (x,y) only, rest of positioning
* is handled later */
d->x += x0;
d->y = *y;
continue;
} else if ((d->type == BOX_INLINE &&
((d->object || d->gadget) == false) &&
!(d->flags & IFRAME) &&
!(d->flags & REPLACE_DIM)) ||
d->type == BOX_BR ||
d->type == BOX_TEXT ||
d->type == BOX_INLINE_END) {
/* regular (non-replaced) inlines */
d->x += x0;
d->y = *y - d->padding[TOP];
if (d->type == BOX_TEXT && d->height > used_height) {
/* text */
used_height = d->height;
}
} else if ((d->type == BOX_INLINE) ||
d->type == BOX_INLINE_BLOCK) {
/* replaced inlines and inline-blocks */
d->x += x0;
d->y = *y + d->border[TOP].width + d->margin[TOP];
h = d->margin[TOP] + d->border[TOP].width +
d->padding[TOP] + d->height +
d->padding[BOTTOM] +
d->border[BOTTOM].width +
d->margin[BOTTOM];
if (used_height < h)
used_height = h;
}
}
first->flags |= NEW_LINE;
assert(b != first || (move_y && 0 < used_height && (left || right)));
/* handle vertical-align by adjusting box y values */
/** \todo proper vertical alignment handling */
for (d = first; d != b; d = d->next) {
if ((d->type == BOX_INLINE && d->inline_end) ||
d->type == BOX_BR ||
d->type == BOX_TEXT ||
d->type == BOX_INLINE_END) {
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
switch (css_computed_vertical_align(d->style, &value,
&unit)) {
case CSS_VERTICAL_ALIGN_SUPER:
case CSS_VERTICAL_ALIGN_TOP:
case CSS_VERTICAL_ALIGN_TEXT_TOP:
/* already at top */
break;
case CSS_VERTICAL_ALIGN_SUB:
case CSS_VERTICAL_ALIGN_BOTTOM:
case CSS_VERTICAL_ALIGN_TEXT_BOTTOM:
d->y += used_height - d->height;
break;
default:
case CSS_VERTICAL_ALIGN_BASELINE:
d->y += 0.75 * (used_height - d->height);
break;
}
}
}
/* handle clearance for br */
if (br_box && css_computed_clear(br_box->style) != CSS_CLEAR_NONE) {
int clear_y = layout_clear(cont->float_children,
css_computed_clear(br_box->style));
if (used_height < clear_y - cy)
used_height = clear_y - cy;
}
if (move_y)
*y += used_height;
*next_box = b;
*width = x; /* return actual width */
return true;
}
/**
* Calculate minimum and maximum width of a line.
*
* \param first a box in an inline container
* \param line_min updated to minimum width of line starting at first
* \param line_max updated to maximum width of line starting at first
* \param first_line true iff this is the first line in the inline container
* \param line_has_height updated to true or false, depending on line
* \return first box in next line, or 0 if no more lines
* \post 0 <= *line_min <= *line_max
*/
struct box *layout_minmax_line(struct box *first,
int *line_min, int *line_max, bool first_line,
bool *line_has_height, const struct font_functions *font_func)
{
int min = 0, max = 0, width, height, fixed;
float frac;
size_t i, j;
struct box *b;
struct box *block;
plot_font_style_t fstyle;
bool no_wrap;
assert(first->parent);
assert(first->parent->parent);
assert(first->parent->parent->style);
block = first->parent->parent;
no_wrap = (css_computed_white_space(block->style) ==
CSS_WHITE_SPACE_NOWRAP ||
css_computed_white_space(block->style) ==
CSS_WHITE_SPACE_PRE);
*line_has_height = false;
/* corresponds to the pass 1 loop in layout_line() */
for (b = first; b; b = b->next) {
enum css_width_e wtype;
enum css_height_e htype;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
assert(b->type == BOX_INLINE || b->type == BOX_INLINE_BLOCK ||
b->type == BOX_FLOAT_LEFT ||
b->type == BOX_FLOAT_RIGHT ||
b->type == BOX_BR || b->type == BOX_TEXT ||
b->type == BOX_INLINE_END);
#ifdef LAYOUT_DEBUG
LOG(("%p: min %i, max %i", b, min, max));
#endif
if (b->type == BOX_BR) {
b = b->next;
break;
}
if (b->type == BOX_FLOAT_LEFT || b->type == BOX_FLOAT_RIGHT) {
assert(b->children);
if (b->children->type == BOX_BLOCK)
layout_minmax_block(b->children, font_func);
else
layout_minmax_table(b->children, font_func);
b->min_width = b->children->min_width;
b->max_width = b->children->max_width;
if (min < b->min_width)
min = b->min_width;
max += b->max_width;
continue;
}
if (b->type == BOX_INLINE_BLOCK) {
layout_minmax_block(b, font_func);
if (min < b->min_width)
min = b->min_width;
max += b->max_width;
if (b->flags & HAS_HEIGHT)
*line_has_height = true;
continue;
}
assert(b->style);
font_plot_style_from_css(b->style, &fstyle);
if (b->type == BOX_INLINE && !b->object &&
!(b->flags & REPLACE_DIM) &&
!(b->flags & IFRAME)) {
fixed = frac = 0;
calculate_mbp_width(b->style, LEFT, true, true, true,
&fixed, &frac);
if (!b->inline_end)
calculate_mbp_width(b->style, RIGHT,
true, true, true,
&fixed, &frac);
if (0 < fixed)
max += fixed;
*line_has_height = true;
/* \todo update min width, consider fractional extra */
} else if (b->type == BOX_INLINE_END) {
fixed = frac = 0;
calculate_mbp_width(b->inline_end->style, RIGHT,
true, true, true,
&fixed, &frac);
if (0 < fixed)
max += fixed;
if (b->next) {
if (b->space == UNKNOWN_WIDTH) {
font_func->font_width(&fstyle, " ", 1,
&b->space);
}
max += b->space;
}
*line_has_height = true;
continue;
}
if (!b->object && !(b->flags & IFRAME) && !b->gadget &&
!(b->flags & REPLACE_DIM)) {
/* inline non-replaced, 10.3.1 and 10.6.1 */
bool no_wrap_box;
if (!b->text)
continue;
no_wrap_box = (css_computed_white_space(b->style) ==
CSS_WHITE_SPACE_NOWRAP ||
css_computed_white_space(b->style) ==
CSS_WHITE_SPACE_PRE);
if (b->width == UNKNOWN_WIDTH) {
/** \todo handle errors */
/* If it's a select element, we must use the
* width of the widest option text */
if (b->parent->parent->gadget &&
b->parent->parent->gadget->type
== GADGET_SELECT) {
int opt_maxwidth = 0;
struct form_option *o;
for (o = b->parent->parent->gadget->
data.select.items; o;
o = o->next) {
int opt_width;
font_func->font_width(&fstyle,
o->text,
strlen(o->text),
&opt_width);
if (opt_maxwidth < opt_width)
opt_maxwidth =opt_width;
}
b->width = opt_maxwidth;
if (nsoption_bool(core_select_menu))
b->width += SCROLLBAR_WIDTH;
} else {
font_func->font_width(&fstyle, b->text,
b->length, &b->width);
b->flags |= MEASURED;
}
}
max += b->width;
if (b->next) {
if (b->space == UNKNOWN_WIDTH) {
font_func->font_width(&fstyle, " ", 1,
&b->space);
}
max += b->space;
}
if (no_wrap) {
/* Don't wrap due to block style,
* so min is the same as max */
min = max;
} else if (no_wrap_box) {
/* This inline box can't be wrapped,
* for min, consider box's width */
if (min < b->width)
min = b->width;
} else if (b->parent->flags & NEED_MIN) {
/* If we care what the minimum width is,
* calculate it. (It's only needed if we're
* shrinking-to-fit.) */
/* min = widest single word */
i = 0;
do {
for (j = i; j != b->length &&
b->text[j] != ' '; j++)
;
font_func->font_width(&fstyle,
b->text + i,
j - i, &width);
if (min < width)
min = width;
i = j + 1;
} while (j != b->length);
}
*line_has_height = true;
continue;
}
/* inline replaced, 10.3.2 and 10.6.2 */
assert(b->style);
/* calculate box width */
wtype = css_computed_width(b->style, &value, &unit);
if (wtype == CSS_WIDTH_SET) {
if (unit == CSS_UNIT_PCT) {
/*
b->width = FPCT_OF_INT_TOINT(value, width);
*/
width = AUTO;
} else {
width = FIXTOINT(nscss_len2px(value, unit,
b->style));
if (width < 0)
width = 0;
}
} else {
width = AUTO;
}
/* height */
htype = css_computed_height(b->style, &value, &unit);
if (htype == CSS_HEIGHT_SET) {
height = FIXTOINT(nscss_len2px(value, unit, b->style));
} else {
height = AUTO;
}
if (b->object || (b->flags & REPLACE_DIM)) {
if (b->object) {
int temp_height = height;
layout_get_object_dimensions(b,
&width, &temp_height,
INT_MIN, INT_MAX,
INT_MIN, INT_MAX);
}
fixed = frac = 0;
calculate_mbp_width(b->style, LEFT, true, true, true,
&fixed, &frac);
calculate_mbp_width(b->style, RIGHT, true, true, true,
&fixed, &frac);
if (0 < width + fixed)
width += fixed;
} else if (b->flags & IFRAME) {
/* TODO: handle percentage widths properly */
if (width == AUTO)
width = 400;
fixed = frac = 0;
calculate_mbp_width(b->style, LEFT, true, true, true,
&fixed, &frac);
calculate_mbp_width(b->style, RIGHT, true, true, true,
&fixed, &frac);
if (0 < width + fixed)
width += fixed;
} else {
/* form control with no object */
if (width == AUTO)
width = FIXTOINT(nscss_len2px(INTTOFIX(1),
CSS_UNIT_EM, b->style));
}
if (min < width)
min = width;
max += width;
*line_has_height = true;
}
if (first_line) {
/* todo: handle percentage values properly */
/* todo: handle text-indent interaction with floats */
int text_indent = layout_text_indent(
first->parent->parent->style, 100);
min = (min + text_indent < 0) ? 0 : min + text_indent;
max = (max + text_indent < 0) ? 0 : max + text_indent;
}
*line_min = min;
*line_max = max;
#ifdef LAYOUT_DEBUG
LOG(("line_min %i, line_max %i", min, max));
#endif
assert(b != first);
assert(0 <= *line_min);
assert(*line_min <= *line_max);
return b;
}
/**
* Calculate the text-indent length.
*
* \param style style of block
* \param width width of containing block
* \return length of indent
*/
int layout_text_indent(const css_computed_style *style, int width)
{
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
css_computed_text_indent(style, &value, &unit);
if (unit == CSS_UNIT_PCT) {
return FPCT_OF_INT_TOINT(value, width);
} else {
return FIXTOINT(nscss_len2px(value, unit, style));
}
}
/**
* Layout the contents of a float or inline block.
*
* \param b float or inline block box
* \param width available width
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_float(struct box *b, int width, html_content *content)
{
assert(b->type == BOX_TABLE || b->type == BOX_BLOCK ||
b->type == BOX_INLINE_BLOCK);
layout_float_find_dimensions(width, b->style, b);
if (b->type == BOX_TABLE) {
if (!layout_table(b, width, content))
return false;
if (b->margin[LEFT] == AUTO)
b->margin[LEFT] = 0;
if (b->margin[RIGHT] == AUTO)
b->margin[RIGHT] = 0;
if (b->margin[TOP] == AUTO)
b->margin[TOP] = 0;
if (b->margin[BOTTOM] == AUTO)
b->margin[BOTTOM] = 0;
} else
return layout_block_context(b, -1, content);
return true;
}
/**
* Position a float in the first available space.
*
* \param c float box to position
* \param width available width
* \param cx x coordinate relative to cont to place float right of
* \param y y coordinate relative to cont to place float below
* \param cont ancestor box which defines horizontal space, for floats
*/
void place_float_below(struct box *c, int width, int cx, int y,
struct box *cont)
{
int x0, x1, yy = y;
struct box *left;
struct box *right;
#ifdef LAYOUT_DEBUG
LOG(("c %p, width %i, cx %i, y %i, cont %p", c, width, cx, y, cont));
#endif
do {
y = yy;
x0 = cx;
x1 = cx + width;
find_sides(cont->float_children, y, y + c->height, &x0, &x1,
&left, &right);
if (left != 0 && right != 0) {
yy = (left->y + left->height <
right->y + right->height ?
left->y + left->height :
right->y + right->height);
} else if (left == 0 && right != 0) {
yy = right->y + right->height;
} else if (left != 0 && right == 0) {
yy = left->y + left->height;
}
} while (!((left == 0 && right == 0) || (c->width <= x1 - x0)));
if (c->type == BOX_FLOAT_LEFT) {
c->x = x0;
} else {
c->x = x1 - c->width;
}
c->y = y;
}
/**
* Layout a table.
*
* \param table table to layout
* \param available_width width of containing block
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_table(struct box *table, int available_width,
html_content *content)
{
unsigned int columns = table->columns; /* total columns */
unsigned int i;
unsigned int *row_span;
int *excess_y;
int table_width, min_width = 0, max_width = 0;
int required_width = 0;
int x, remainder = 0, count = 0;
int table_height = 0;
int min_height = 0;
int *xs; /* array of column x positions */
int auto_width;
int spare_width;
int relative_sum = 0;
int border_spacing_h = 0, border_spacing_v = 0;
int spare_height;
int positioned_columns = 0;
struct box *containing_block = NULL;
struct box *c;
struct box *row;
struct box *row_group;
struct box **row_span_cell;
struct column *col;
const css_computed_style *style = table->style;
enum css_width_e wtype;
enum css_height_e htype;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
assert(table->type == BOX_TABLE);
assert(style);
assert(table->children && table->children->children);
assert(columns);
/* allocate working buffers */
col = malloc(columns * sizeof col[0]);
excess_y = malloc(columns * sizeof excess_y[0]);
row_span = malloc(columns * sizeof row_span[0]);
row_span_cell = malloc(columns * sizeof row_span_cell[0]);
xs = malloc((columns + 1) * sizeof xs[0]);
if (!col || !xs || !row_span || !excess_y || !row_span_cell) {
free(col);
free(excess_y);
free(row_span);
free(row_span_cell);
free(xs);
return false;
}
memcpy(col, table->col, sizeof(col[0]) * columns);
/* find margins, paddings, and borders for table and cells */
layout_find_dimensions(available_width, -1, table, style, 0, 0, 0, 0,
0, 0, table->margin, table->padding, table->border);
for (row_group = table->children; row_group;
row_group = row_group->next) {
for (row = row_group->children; row; row = row->next) {
for (c = row->children; c; c = c->next) {
enum css_overflow_e overflow_x;
enum css_overflow_e overflow_y;
assert(c->style);
table_used_border_for_cell(c);
layout_find_dimensions(available_width, -1,
c, c->style, 0, 0, 0, 0, 0, 0,
0, c->padding, c->border);
overflow_x = css_computed_overflow_x(c->style);
overflow_y = css_computed_overflow_y(c->style);
if (overflow_x == CSS_OVERFLOW_SCROLL ||
overflow_x ==
CSS_OVERFLOW_AUTO) {
c->padding[BOTTOM] += SCROLLBAR_WIDTH;
}
if (overflow_y == CSS_OVERFLOW_SCROLL ||
overflow_y ==
CSS_OVERFLOW_AUTO) {
c->padding[RIGHT] += SCROLLBAR_WIDTH;
}
}
}
}
/* border-spacing is used in the separated borders model */
if (css_computed_border_collapse(style) ==
CSS_BORDER_COLLAPSE_SEPARATE) {
css_fixed h = 0, v = 0;
css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX;
css_computed_border_spacing(style, &h, &hu, &v, &vu);
border_spacing_h = FIXTOINT(nscss_len2px(h, hu, style));
border_spacing_v = FIXTOINT(nscss_len2px(v, vu, style));
}
/* find specified table width, or available width if auto-width */
wtype = css_computed_width(style, &value, &unit);
if (wtype == CSS_WIDTH_SET) {
if (unit == CSS_UNIT_PCT) {
table_width = FPCT_OF_INT_TOINT(value, available_width);
} else {
table_width =
FIXTOINT(nscss_len2px(value, unit, style));
}
/* specified width includes border */
table_width -= table->border[LEFT].width +
table->border[RIGHT].width;
table_width = table_width < 0 ? 0 : table_width;
auto_width = table_width;
} else {
table_width = AUTO;
auto_width = available_width -
((table->margin[LEFT] == AUTO ? 0 :
table->margin[LEFT]) +
table->border[LEFT].width +
table->padding[LEFT] +
table->padding[RIGHT] +
table->border[RIGHT].width +
(table->margin[RIGHT] == AUTO ? 0 :
table->margin[RIGHT]));
}
/* Find any table height specified within CSS/HTML */
htype = css_computed_height(style, &value, &unit);
if (htype == CSS_HEIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
/* This is the minimum height for the table
* (see 17.5.3) */
if (css_computed_position(table->style) ==
CSS_POSITION_ABSOLUTE) {
/* Table is absolutely positioned */
assert(table->float_container);
containing_block = table->float_container;
} else if (table->float_container &&
css_computed_position(table->style) !=
CSS_POSITION_ABSOLUTE &&
(css_computed_float(table->style) ==
CSS_FLOAT_LEFT ||
css_computed_float(table->style) ==
CSS_FLOAT_RIGHT)) {
/* Table is a float */
assert(table->parent && table->parent->parent &&
table->parent->parent->parent);
containing_block =
table->parent->parent->parent;
} else if (table->parent && table->parent->type !=
BOX_INLINE_CONTAINER) {
/* Table is a block level element */
containing_block = table->parent;
} else if (table->parent && table->parent->type ==
BOX_INLINE_CONTAINER) {
/* Table is an inline block */
assert(table->parent->parent);
containing_block = table->parent->parent;
}
if (containing_block) {
css_fixed ignored = 0;
htype = css_computed_height(
containing_block->style,
&ignored, &unit);
}
if (containing_block &&
containing_block->height != AUTO &&
(css_computed_position(table->style) ==
CSS_POSITION_ABSOLUTE ||
htype == CSS_HEIGHT_SET)) {
/* Table is absolutely positioned or its
* containing block has a valid specified
* height. (CSS 2.1 Section 10.5) */
min_height = FPCT_OF_INT_TOINT(value,
containing_block->height);
}
} else {
/* This is the minimum height for the table
* (see 17.5.3) */
min_height = FIXTOINT(nscss_len2px(value, unit, style));
}
}
/* calculate width required by cells */
for (i = 0; i != columns; i++) {
#ifdef LAYOUT_DEBUG
LOG(("table %p, column %u: type %s, width %i, min %i, max %i",
table, i,
((const char *[]) {"UNKNOWN", "FIXED", "AUTO",
"PERCENT", "RELATIVE"})[col[i].type],
col[i].width, col[i].min, col[i].max));
#endif
if (col[i].positioned) {
positioned_columns++;
continue;
} else if (col[i].type == COLUMN_WIDTH_FIXED) {
if (col[i].width < col[i].min)
col[i].width = col[i].max = col[i].min;
else
col[i].min = col[i].max = col[i].width;
required_width += col[i].width;
} else if (col[i].type == COLUMN_WIDTH_PERCENT) {
int width = col[i].width * auto_width / 100;
required_width += col[i].min < width ? width :
col[i].min;
} else
required_width += col[i].min;
#ifdef LAYOUT_DEBUG
LOG(("required_width %i", required_width));
#endif
}
required_width += (columns + 1 - positioned_columns) *
border_spacing_h;
#ifdef LAYOUT_DEBUG
LOG(("width %i, min %i, max %i, auto %i, required %i",
table_width, table->min_width, table->max_width,
auto_width, required_width));
#endif
if (auto_width < required_width) {
/* table narrower than required width for columns:
* treat percentage widths as maximums */
for (i = 0; i != columns; i++) {
if (col[i].type == COLUMN_WIDTH_RELATIVE)
continue;
if (col[i].type == COLUMN_WIDTH_PERCENT) {
col[i].max = auto_width * col[i].width / 100;
if (col[i].max < col[i].min)
col[i].max = col[i].min;
}
min_width += col[i].min;
max_width += col[i].max;
}
} else {
/* take percentages exactly */
for (i = 0; i != columns; i++) {
if (col[i].type == COLUMN_WIDTH_RELATIVE)
continue;
if (col[i].type == COLUMN_WIDTH_PERCENT) {
int width = auto_width * col[i].width / 100;
if (width < col[i].min)
width = col[i].min;
col[i].min = col[i].width = col[i].max = width;
col[i].type = COLUMN_WIDTH_FIXED;
}
min_width += col[i].min;
max_width += col[i].max;
}
}
/* allocate relative widths */
spare_width = auto_width;
for (i = 0; i != columns; i++) {
if (col[i].type == COLUMN_WIDTH_RELATIVE)
relative_sum += col[i].width;
else if (col[i].type == COLUMN_WIDTH_FIXED)
spare_width -= col[i].width;
else
spare_width -= col[i].min;
}
spare_width -= (columns + 1) * border_spacing_h;
if (relative_sum != 0) {
if (spare_width < 0)
spare_width = 0;
for (i = 0; i != columns; i++) {
if (col[i].type == COLUMN_WIDTH_RELATIVE) {
col[i].min = ceil(col[i].max =
(float) spare_width
* (float) col[i].width
/ relative_sum);
min_width += col[i].min;
max_width += col[i].max;
}
}
}
min_width += (columns + 1) * border_spacing_h;
max_width += (columns + 1) * border_spacing_h;
if (auto_width <= min_width) {
/* not enough space: minimise column widths */
for (i = 0; i < columns; i++) {
col[i].width = col[i].min;
}
table_width = min_width;
} else if (max_width <= auto_width) {
/* more space than maximum width */
if (table_width == AUTO) {
/* for auto-width tables, make columns max width */
for (i = 0; i < columns; i++) {
col[i].width = col[i].max;
}
table_width = max_width;
} else {
/* for fixed-width tables, distribute the extra space
* too */
unsigned int flexible_columns = 0;
for (i = 0; i != columns; i++)
if (col[i].type != COLUMN_WIDTH_FIXED)
flexible_columns++;
if (flexible_columns == 0) {
int extra = (table_width - max_width) / columns;
remainder = (table_width - max_width) -
(extra * columns);
for (i = 0; i != columns; i++) {
col[i].width = col[i].max + extra;
count -= remainder;
if (count < 0) {
col[i].width++;
count += columns;
}
}
} else {
int extra = (table_width - max_width) /
flexible_columns;
remainder = (table_width - max_width) -
(extra * flexible_columns);
for (i = 0; i != columns; i++)
if (col[i].type != COLUMN_WIDTH_FIXED) {
col[i].width = col[i].max +
extra;
count -= remainder;
if (count < 0) {
col[i].width++;
count += flexible_columns;
}
}
}
}
} else {
/* space between min and max: fill it exactly */
float scale = (float) (auto_width - min_width) /
(float) (max_width - min_width);
/* fprintf(stderr, "filling, scale %f\n", scale); */
for (i = 0; i < columns; i++) {
col[i].width = col[i].min + (int) (0.5 +
(col[i].max - col[i].min) * scale);
}
table_width = auto_width;
}
xs[0] = x = border_spacing_h;
for (i = 0; i != columns; i++) {
if (!col[i].positioned)
x += col[i].width + border_spacing_h;
xs[i + 1] = x;
row_span[i] = 0;
excess_y[i] = 0;
row_span_cell[i] = 0;
}
/* position cells */
table_height = border_spacing_v;
for (row_group = table->children; row_group;
row_group = row_group->next) {
int row_group_height = 0;
for (row = row_group->children; row; row = row->next) {
int row_height = 0;
htype = css_computed_height(row->style, &value, &unit);
if (htype == CSS_HEIGHT_SET && unit != CSS_UNIT_PCT) {
row_height = FIXTOINT(nscss_len2px(value, unit,
row->style));
}
for (c = row->children; c; c = c->next) {
assert(c->style);
c->width = xs[c->start_column + c->columns] -
xs[c->start_column] -
border_spacing_h -
c->border[LEFT].width -
c->padding[LEFT] -
c->padding[RIGHT] -
c->border[RIGHT].width;
c->float_children = 0;
c->height = AUTO;
if (!layout_block_context(c, -1, content)) {
free(col);
free(excess_y);
free(row_span);
free(row_span_cell);
free(xs);
return false;
}
/* warning: c->descendant_y0 and
* c->descendant_y1 used as temporary storage
* until after vertical alignment is complete */
c->descendant_y0 = c->height;
c->descendant_y1 = c->padding[BOTTOM];
htype = css_computed_height(c->style,
&value, &unit);
if (htype == CSS_HEIGHT_SET &&
unit != CSS_UNIT_PCT) {
/* some sites use height="1" or similar
* to attempt to make cells as small as
* possible, so treat it as a minimum */
int h = FIXTOINT(nscss_len2px(value,
unit, c->style));
if (c->height < h)
c->height = h;
}
/* specified row height is treated as a minimum
*/
if (c->height < row_height)
c->height = row_height;
c->x = xs[c->start_column] +
c->border[LEFT].width;
c->y = c->border[TOP].width;
for (i = 0; i != c->columns; i++) {
row_span[c->start_column + i] = c->rows;
excess_y[c->start_column + i] =
c->border[TOP].width +
c->padding[TOP] +
c->height +
c->padding[BOTTOM] +
c->border[BOTTOM].width;
row_span_cell[c->start_column + i] = 0;
}
row_span_cell[c->start_column] = c;
c->padding[BOTTOM] = -border_spacing_v -
c->border[TOP].width -
c->padding[TOP] -
c->height -
c->border[BOTTOM].width;
}
for (i = 0; i != columns; i++)
if (row_span[i] != 0)
row_span[i]--;
else
row_span_cell[i] = 0;
if (row->next || row_group->next) {
/* row height is greatest excess of a cell
* which ends in this row */
for (i = 0; i != columns; i++)
if (row_span[i] == 0 && row_height <
excess_y[i])
row_height = excess_y[i];
} else {
/* except in the last row */
for (i = 0; i != columns; i++)
if (row_height < excess_y[i])
row_height = excess_y[i];
}
for (i = 0; i != columns; i++) {
if (row_height < excess_y[i])
excess_y[i] -= row_height;
else
excess_y[i] = 0;
if (row_span_cell[i] != 0)
row_span_cell[i]->padding[BOTTOM] +=
row_height +
border_spacing_v;
}
row->x = 0;
row->y = row_group_height;
row->width = table_width;
row->height = row_height;
row_group_height += row_height + border_spacing_v;
}
row_group->x = 0;
row_group->y = table_height;
row_group->width = table_width;
row_group->height = row_group_height;
table_height += row_group_height;
}
/* Table height is either the height of the contents, or specified
* height if greater */
table_height = max(table_height, min_height);
/** \TODO distribute spare height over the row groups / rows / cells */
/* perform vertical alignment */
for (row_group = table->children; row_group;
row_group = row_group->next) {
for (row = row_group->children; row; row = row->next) {
for (c = row->children; c; c = c->next) {
enum css_vertical_align_e vertical_align;
/* unextended bottom padding is in
* c->descendant_y1, and unextended
* cell height is in c->descendant_y0 */
spare_height = (c->padding[BOTTOM] -
c->descendant_y1) +
(c->height - c->descendant_y0);
vertical_align = css_computed_vertical_align(
c->style, &value, &unit);
switch (vertical_align) {
case CSS_VERTICAL_ALIGN_SUB:
case CSS_VERTICAL_ALIGN_SUPER:
case CSS_VERTICAL_ALIGN_TEXT_TOP:
case CSS_VERTICAL_ALIGN_TEXT_BOTTOM:
case CSS_VERTICAL_ALIGN_SET:
case CSS_VERTICAL_ALIGN_BASELINE:
/* todo: baseline alignment, for now
* just use ALIGN_TOP */
case CSS_VERTICAL_ALIGN_TOP:
break;
case CSS_VERTICAL_ALIGN_MIDDLE:
c->padding[TOP] += spare_height / 2;
c->padding[BOTTOM] -= spare_height / 2;
layout_move_children(c, 0,
spare_height / 2);
break;
case CSS_VERTICAL_ALIGN_BOTTOM:
c->padding[TOP] += spare_height;
c->padding[BOTTOM] -= spare_height;
layout_move_children(c, 0,
spare_height);
break;
case CSS_VERTICAL_ALIGN_INHERIT:
assert(0);
break;
}
}
}
}
/* Top and bottom margins of 'auto' are set to 0. CSS2.1 10.6.3 */
if (table->margin[TOP] == AUTO)
table->margin[TOP] = 0;
if (table->margin[BOTTOM] == AUTO)
table->margin[BOTTOM] = 0;
free(col);
free(excess_y);
free(row_span);
free(row_span_cell);
free(xs);
table->width = table_width;
table->height = table_height;
return true;
}
/**
* Calculate minimum and maximum width of a table.
*
* \param table box of type TABLE
* \post table->min_width and table->max_width filled in,
* 0 <= table->min_width <= table->max_width
*/
void layout_minmax_table(struct box *table,
const struct font_functions *font_func)
{
unsigned int i, j;
int border_spacing_h = 0;
int table_min = 0, table_max = 0;
int extra_fixed = 0;
float extra_frac = 0;
struct column *col = table->col;
struct box *row_group, *row, *cell;
enum css_width_e wtype;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
/* check if the widths have already been calculated */
if (table->max_width != UNKNOWN_MAX_WIDTH)
return;
/* start with 0 except for fixed-width columns */
for (i = 0; i != table->columns; i++) {
if (col[i].type == COLUMN_WIDTH_FIXED)
col[i].min = col[i].max = col[i].width;
else
col[i].min = col[i].max = 0;
}
/* border-spacing is used in the separated borders model */
if (css_computed_border_collapse(table->style) ==
CSS_BORDER_COLLAPSE_SEPARATE) {
css_fixed h = 0, v = 0;
css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX;
css_computed_border_spacing(table->style, &h, &hu, &v, &vu);
border_spacing_h = FIXTOINT(nscss_len2px(h, hu, table->style));
}
/* 1st pass: consider cells with colspan 1 only */
for (row_group = table->children; row_group; row_group =row_group->next)
for (row = row_group->children; row; row = row->next)
for (cell = row->children; cell; cell = cell->next) {
assert(cell->type == BOX_TABLE_CELL);
assert(cell->style);
/** TODO: Handle colspan="0" correctly.
* It's currently converted to 1 in box normaisation */
assert(cell->columns != 0);
if (cell->columns != 1)
continue;
layout_minmax_block(cell, font_func);
i = cell->start_column;
if (col[i].positioned)
continue;
/* update column min, max widths using cell widths */
if (col[i].min < cell->min_width)
col[i].min = cell->min_width;
if (col[i].max < cell->max_width)
col[i].max = cell->max_width;
}
/* 2nd pass: cells which span multiple columns */
for (row_group = table->children; row_group; row_group =row_group->next)
for (row = row_group->children; row; row = row->next)
for (cell = row->children; cell; cell = cell->next) {
unsigned int flexible_columns = 0;
int min = 0, max = 0, fixed_width = 0, extra;
if (cell->columns == 1)
continue;
layout_minmax_block(cell, font_func);
i = cell->start_column;
/* find min width so far of spanned columns, and count
* number of non-fixed spanned columns and total fixed width */
for (j = 0; j != cell->columns; j++) {
min += col[i + j].min;
if (col[i + j].type == COLUMN_WIDTH_FIXED)
fixed_width += col[i + j].width;
else
flexible_columns++;
}
min += (cell->columns - 1) * border_spacing_h;
/* distribute extra min to spanned columns */
if (min < cell->min_width) {
if (flexible_columns == 0) {
extra = 1 + (cell->min_width - min) /
cell->columns;
for (j = 0; j != cell->columns; j++) {
col[i + j].min += extra;
if (col[i + j].max < col[i + j].min)
col[i + j].max = col[i + j].min;
}
} else {
extra = 1 + (cell->min_width - min) /
flexible_columns;
for (j = 0; j != cell->columns; j++) {
if (col[i + j].type !=
COLUMN_WIDTH_FIXED) {
col[i + j].min += extra;
if (col[i + j].max <
col[i + j].min)
col[i + j].max =
col[i + j].min;
}
}
}
}
/* find max width so far of spanned columns */
for (j = 0; j != cell->columns; j++)
max += col[i + j].max;
max += (cell->columns - 1) * border_spacing_h;
/* distribute extra max to spanned columns */
if (max < cell->max_width && flexible_columns) {
extra = 1 + (cell->max_width - max) / flexible_columns;
for (j = 0; j != cell->columns; j++)
if (col[i + j].type != COLUMN_WIDTH_FIXED)
col[i + j].max += extra;
}
}
for (i = 0; i != table->columns; i++) {
if (col[i].max < col[i].min) {
box_dump(stderr, table, 0, true);
assert(0);
}
table_min += col[i].min;
table_max += col[i].max;
}
/* fixed width takes priority, unless it is too narrow */
wtype = css_computed_width(table->style, &value, &unit);
if (wtype == CSS_WIDTH_SET && unit != CSS_UNIT_PCT) {
int width = FIXTOINT(nscss_len2px(value, unit, table->style));
if (table_min < width)
table_min = width;
if (table_max < width)
table_max = width;
}
/* add margins, border, padding to min, max widths */
calculate_mbp_width(table->style, LEFT, true, true, true,
&extra_fixed, &extra_frac);
calculate_mbp_width(table->style, RIGHT, true, true, true,
&extra_fixed, &extra_frac);
if (extra_fixed < 0)
extra_fixed = 0;
if (extra_frac < 0)
extra_frac = 0;
if (1.0 <= extra_frac)
extra_frac = 0.9;
table->min_width = (table_min + extra_fixed) / (1.0 - extra_frac);
table->max_width = (table_max + extra_fixed) / (1.0 - extra_frac);
table->min_width += (table->columns + 1) * border_spacing_h;
table->max_width += (table->columns + 1) * border_spacing_h;
assert(0 <= table->min_width && table->min_width <= table->max_width);
}
/**
* Moves the children of a box by a specified amount
*
* \param box top of tree of boxes
* \param x the amount to move children by horizontally
* \param y the amount to move children by vertically
*/
void layout_move_children(struct box *box, int x, int y)
{
assert(box);
for (box = box->children; box; box = box->next) {
box->x += x;
box->y += y;
}
}
/**
* Determine width of margin, borders, and padding on one side of a box.
*
* \param style style to measure
* \param size side of box to measure
* \param margin whether margin width is required
* \param border whether border width is required
* \param padding whether padding width is required
* \param fixed increased by sum of fixed margin, border, and padding
* \param frac increased by sum of fractional margin and padding
*/
void calculate_mbp_width(const css_computed_style *style, unsigned int side,
bool margin, bool border, bool padding,
int *fixed, float *frac)
{
typedef uint8_t (*len_func)(const css_computed_style *style,
css_fixed *length, css_unit *unit);
static len_func margin_funcs[4] = {
css_computed_margin_top,
css_computed_margin_right,
css_computed_margin_bottom,
css_computed_margin_left
};
static len_func padding_funcs[4] = {
css_computed_padding_top,
css_computed_padding_right,
css_computed_padding_bottom,
css_computed_padding_left
};
static struct {
len_func width;
uint8_t (*style)(const css_computed_style *style);
} border_funcs[4] = {
{ css_computed_border_top_width,
css_computed_border_top_style },
{ css_computed_border_right_width,
css_computed_border_right_style },
{ css_computed_border_bottom_width,
css_computed_border_bottom_style },
{ css_computed_border_left_width,
css_computed_border_left_style }
};
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
assert(style);
/* margin */
if (margin) {
enum css_margin_e type;
type = margin_funcs[side](style, &value, &unit);
if (type == CSS_MARGIN_SET) {
if (unit == CSS_UNIT_PCT) {
*frac += FIXTOINT(FDIV(value, F_100));
} else {
*fixed += FIXTOINT(nscss_len2px(value, unit,
style));
}
}
}
/* border */
if (border) {
if (border_funcs[side].style(style) !=
CSS_BORDER_STYLE_NONE) {
border_funcs[side].width(style, &value, &unit);
*fixed += FIXTOINT(nscss_len2px(value, unit, style));
}
}
/* padding */
if (padding) {
padding_funcs[side](style, &value, &unit);
if (unit == CSS_UNIT_PCT) {
*frac += FIXTOINT(FDIV(value, F_100));
} else {
*fixed += FIXTOINT(nscss_len2px(value, unit, style));
}
}
}
/**
* Layout list markers.
*/
void layout_lists(struct box *box,
const struct font_functions *font_func)
{
struct box *child;
struct box *marker;
plot_font_style_t fstyle;
for (child = box->children; child; child = child->next) {
if (child->list_marker) {
marker = child->list_marker;
if (marker->object) {
marker->width =
content_get_width(marker->object);
marker->x = -marker->width;
marker->height =
content_get_height(marker->object);
marker->y = (line_height(marker->style) -
marker->height) / 2;
} else if (marker->text) {
if (marker->width == UNKNOWN_WIDTH) {
font_plot_style_from_css(marker->style,
&fstyle);
font_func->font_width(&fstyle,
marker->text,
marker->length,
&marker->width);
marker->flags |= MEASURED;
}
marker->x = -marker->width;
marker->y = 0;
marker->height = line_height(marker->style);
} else {
marker->x = 0;
marker->y = 0;
marker->width = 0;
marker->height = 0;
}
/* Gap between marker and content */
marker->x -= 4;
}
layout_lists(child, font_func);
}
}
/**
* Adjust positions of relatively positioned boxes.
*
* \param root box to adjust the position of
* \param fp box which forms the block formatting context for children of
* "root" which are floats
* \param fx x offset due to intervening relatively positioned boxes
* between current box, "root", and the block formatting context
* box, "fp", for float children of "root"
* \param fy y offset due to intervening relatively positioned boxes
* between current box, "root", and the block formatting context
* box, "fp", for float children of "root"
*/
void layout_position_relative(struct box *root, struct box *fp, int fx, int fy)
{
struct box *box; /* for children of "root" */
struct box *fn; /* for block formatting context box for children of
* "box" */
struct box *fc; /* for float children of the block formatting context,
* "fp" */
int x, y; /* for the offsets resulting from any relative
* positioning on the current block */
int fnx, fny; /* for affsets which apply to flat children of "box" */
/**\todo ensure containing box is large enough after moving boxes */
assert(root);
/* Normal children */
for (box = root->children; box; box = box->next) {
if (box->type == BOX_TEXT)
continue;
/* If relatively positioned, get offsets */
if (box->style && css_computed_position(box->style) ==
CSS_POSITION_RELATIVE)
layout_compute_relative_offset(box, &x, &y);
else
x = y = 0;
/* Adjust float coordinates.
* (note float x and y are relative to their block formatting
* context box and not their parent) */
if (box->style && (css_computed_float(box->style) ==
CSS_FLOAT_LEFT ||
css_computed_float(box->style) ==
CSS_FLOAT_RIGHT) &&
(fx != 0 || fy != 0)) {
/* box is a float and there is a float offset to
* apply */
for (fc = fp->float_children; fc; fc = fc->next_float) {
if (box == fc->children) {
/* Box is floated in the block
* formatting context block, fp.
* Apply float offsets. */
box->x += fx;
box->y += fy;
fx = fy = 0;
}
}
}
if (box->float_children) {
fn = box;
fnx = fny = 0;
} else {
fn = fp;
fnx = fx + x;
fny = fy + y;
}
/* recurse first */
layout_position_relative(box, fn, fnx, fny);
/* Ignore things we're not interested in. */
if (!box->style || (box->style &&
css_computed_position(box->style) !=
CSS_POSITION_RELATIVE))
continue;
box->x += x;
box->y += y;
/* Handle INLINEs - their "children" are in fact
* the sibling boxes between the INLINE and
* INLINE_END boxes */
if (box->type == BOX_INLINE && box->inline_end) {
struct box *b;
for (b = box->next; b && b != box->inline_end;
b = b->next) {
b->x += x;
b->y += y;
}
}
}
}
/**
* Compute a box's relative offset as per CSS 2.1 9.4.3
*
* \param box Box to compute relative offsets for.
* \param x Receives relative offset in x.
* \param y Receives relative offset in y.
*/
void layout_compute_relative_offset(struct box *box, int *x, int *y)
{
int left, right, top, bottom;
struct box *containing_block;
assert(box && box->parent && box->style &&
css_computed_position(box->style) ==
CSS_POSITION_RELATIVE);
if (box->float_container &&
(css_computed_float(box->style) == CSS_FLOAT_LEFT ||
css_computed_float(box->style) == CSS_FLOAT_RIGHT)) {
containing_block = box->float_container;
} else {
containing_block = box->parent;
}
layout_compute_offsets(box, containing_block,
&top, &right, &bottom, &left);
if (left == AUTO && right == AUTO)
left = right = 0;
else if (left == AUTO)
/* left is auto => computed = -right */
left = -right;
else if (right == AUTO)
/* right is auto => computed = -left */
right = -left;
else {
/* over constrained => examine direction property
* of containing block */
if (containing_block->style &&
css_computed_direction(
containing_block->style) ==
CSS_DIRECTION_RTL) {
/* right wins */
left = -right;
} else {
/* assume LTR in all other cases */
right = -left;
}
}
assert(left == -right);
if (top == AUTO && bottom == AUTO)
top = bottom = 0;
else if (top == AUTO)
top = -bottom;
else if (bottom == AUTO)
bottom = -top;
else
bottom = -top;
#ifdef LAYOUT_DEBUG
LOG(("left %i, right %i, top %i, bottom %i", left, right, top, bottom));
#endif
*x = left;
*y = top;
}
/**
* Recursively layout and position absolutely positioned boxes.
*
* \param box tree of boxes to layout
* \param containing_block current containing block
* \param cx position of box relative to containing_block
* \param cy position of box relative to containing_block
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_position_absolute(struct box *box,
struct box *containing_block,
int cx, int cy,
html_content *content)
{
struct box *c;
for (c = box->children; c; c = c->next) {
if ((c->type == BOX_BLOCK || c->type == BOX_TABLE ||
c->type == BOX_INLINE_BLOCK) &&
(css_computed_position(c->style) ==
CSS_POSITION_ABSOLUTE ||
css_computed_position(c->style) ==
CSS_POSITION_FIXED)) {
if (!layout_absolute(c, containing_block,
cx, cy, content))
return false;
if (!layout_position_absolute(c, c, 0, 0, content))
return false;
} else if (c->style && css_computed_position(c->style) ==
CSS_POSITION_RELATIVE) {
if (!layout_position_absolute(c, c, 0, 0, content))
return false;
} else {
int px, py;
if (c->style && (css_computed_float(c->style) ==
CSS_FLOAT_LEFT ||
css_computed_float(c->style) ==
CSS_FLOAT_RIGHT)) {
/* Float x/y coords are relative to nearest
* ansestor with float_children, rather than
* relative to parent. Need to get x/y relative
* to parent */
struct box *p;
px = c->x;
py = c->y;
for (p = box->parent; p && !p->float_children;
p = p->parent) {
px -= p->x;
py -= p->y;
}
} else {
/* Not a float, so box x/y coords are relative
* to parent */
px = c->x;
py = c->y;
}
if (!layout_position_absolute(c, containing_block,
cx + px, cy + py, content))
return false;
}
}
return true;
}
/**
* Layout and position an absolutely positioned box.
*
* \param box absolute box to layout and position
* \param containing_block containing block
* \param cx position of box relative to containing_block
* \param cy position of box relative to containing_block
* \param content memory pool for any new boxes
* \return true on success, false on memory exhaustion
*/
bool layout_absolute(struct box *box, struct box *containing_block,
int cx, int cy,
html_content *content)
{
int static_left, static_top; /* static position */
int top, right, bottom, left;
int width, height, max_width, min_width;
int *margin = box->margin;
int *padding = box->padding;
struct box_border *border = box->border;
int available_width = containing_block->width;
int space;
assert(box->type == BOX_BLOCK || box->type == BOX_TABLE ||
box->type == BOX_INLINE_BLOCK);
/* The static position is where the box would be if it was not
* absolutely positioned. The x and y are filled in by
* layout_block_context(). */
static_left = cx + box->x;
static_top = cy + box->y;
if (containing_block->type == BOX_BLOCK ||
containing_block->type == BOX_INLINE_BLOCK ||
containing_block->type == BOX_TABLE_CELL) {
/* Block level container => temporarily increase containing
* block dimensions to include padding (we restore this
* again at the end) */
containing_block->width += containing_block->padding[LEFT] +
containing_block->padding[RIGHT];
containing_block->height += containing_block->padding[TOP] +
containing_block->padding[BOTTOM];
} else {
/** \todo inline containers */
}
layout_compute_offsets(box, containing_block,
&top, &right, &bottom, &left);
/* Pass containing block into layout_find_dimensions via the float
* containing block box member. This is unused for absolutely positioned
* boxes because a box can't be floated and absolutely positioned. */
box->float_container = containing_block;
layout_find_dimensions(available_width, -1, box, box->style,
&width, &height, &max_width, &min_width,
0, 0, margin, padding, border);
box->float_container = NULL;
/* 10.3.7 */
#ifdef LAYOUT_DEBUG
LOG(("%i + %i + %i + %i + %i + %i + %i + %i + %i = %i",
left, margin[LEFT], border[LEFT].width,
padding[LEFT], width, padding[RIGHT],
border[RIGHT].width, margin[RIGHT], right,
containing_block->width));
#endif
if (left == AUTO && width == AUTO && right == AUTO) {
if (margin[LEFT] == AUTO)
margin[LEFT] = 0;
if (margin[RIGHT] == AUTO)
margin[RIGHT] = 0;
left = static_left;
width = min(max(box->min_width, available_width),
box->max_width);
width -= box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] + box->padding[RIGHT] +
box->border[RIGHT].width + box->margin[RIGHT];
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width) width = max_width;
if (min_width > 0 && width < min_width) width = min_width;
right = containing_block->width -
left -
margin[LEFT] - border[LEFT].width - padding[LEFT] -
width -
padding[RIGHT] - border[RIGHT].width - margin[RIGHT];
} else if (left != AUTO && width != AUTO && right != AUTO) {
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width) width = max_width;
if (min_width > 0 && width < min_width) width = min_width;
if (margin[LEFT] == AUTO && margin[RIGHT] == AUTO) {
space = containing_block->width -
left - border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - right;
if (space < 0) {
margin[LEFT] = 0;
margin[RIGHT] = space;
} else {
margin[LEFT] = margin[RIGHT] = space / 2;
}
} else if (margin[LEFT] == AUTO) {
margin[LEFT] = containing_block->width -
left - border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT] -
right;
} else if (margin[RIGHT] == AUTO) {
margin[RIGHT] = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - right;
} else {
right = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT];
}
} else {
if (margin[LEFT] == AUTO)
margin[LEFT] = 0;
if (margin[RIGHT] == AUTO)
margin[RIGHT] = 0;
if (left == AUTO && width == AUTO && right != AUTO) {
available_width -= right;
width = min(max(box->min_width, available_width),
box->max_width);
width -= box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] + box->padding[RIGHT] +
box->border[RIGHT].width + box->margin[RIGHT];
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
left = containing_block->width -
margin[LEFT] - border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT] -
right;
} else if (left == AUTO && width != AUTO && right == AUTO) {
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
left = static_left;
right = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT];
} else if (left != AUTO && width == AUTO && right == AUTO) {
available_width -= left;
width = min(max(box->min_width, available_width),
box->max_width);
width -= box->margin[LEFT] + box->border[LEFT].width +
box->padding[LEFT] + box->padding[RIGHT] +
box->border[RIGHT].width + box->margin[RIGHT];
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
right = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT];
} else if (left == AUTO && width != AUTO && right != AUTO) {
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
left = containing_block->width -
margin[LEFT] - border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT] -
right;
} else if (left != AUTO && width == AUTO && right != AUTO) {
width = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT] -
right;
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
} else if (left != AUTO && width != AUTO && right == AUTO) {
/* Adjust for {min|max}-width */
if (max_width >= 0 && width > max_width)
width = max_width;
if (min_width > 0 && width < min_width)
width = min_width;
right = containing_block->width -
left - margin[LEFT] -
border[LEFT].width -
padding[LEFT] - width - padding[RIGHT] -
border[RIGHT].width - margin[RIGHT];
}
}
#ifdef LAYOUT_DEBUG
LOG(("%i + %i + %i + %i + %i + %i + %i + %i + %i = %i",
left, margin[LEFT], border[LEFT].width, padding[LEFT],
width, padding[RIGHT], border[RIGHT].width,
margin[RIGHT], right,
containing_block->width));
#endif
box->x = left + margin[LEFT] + border[LEFT].width - cx;
if (containing_block->type == BOX_BLOCK ||
containing_block->type == BOX_INLINE_BLOCK ||
containing_block->type == BOX_TABLE_CELL) {
/* Block-level ancestor => reset container's width */
containing_block->width -= containing_block->padding[LEFT] +
containing_block->padding[RIGHT];
} else {
/** \todo inline ancestors */
}
box->width = width;
box->height = height;
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->object || box->flags & IFRAME) {
if (!layout_block_context(box, -1, content))
return false;
} else if (box->type == BOX_TABLE) {
/* layout_table also expects the containing block to be
* stored in the float_container field */
box->float_container = containing_block;
/* \todo layout_table considers margins etc. again */
if (!layout_table(box, width, content))
return false;
box->float_container = NULL;
layout_solve_width(box, box->parent->width, box->width, 0, 0,
-1, -1);
}
/* 10.6.4 */
#ifdef LAYOUT_DEBUG
LOG(("%i + %i + %i + %i + %i + %i + %i + %i + %i = %i",
top, margin[TOP], border[TOP].width, padding[TOP],
height, padding[BOTTOM], border[BOTTOM].width,
margin[BOTTOM], bottom,
containing_block->height));
#endif
if (top == AUTO && height == AUTO && bottom == AUTO) {
top = static_top;
height = box->height;
if (margin[TOP] == AUTO)
margin[TOP] = 0;
if (margin[BOTTOM] == AUTO)
margin[BOTTOM] = 0;
bottom = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height - padding[BOTTOM] -
border[BOTTOM].width - margin[BOTTOM];
} else if (top != AUTO && height != AUTO && bottom != AUTO) {
if (margin[TOP] == AUTO && margin[BOTTOM] == AUTO) {
space = containing_block->height -
top - border[TOP].width - padding[TOP] -
height - padding[BOTTOM] -
border[BOTTOM].width - bottom;
margin[TOP] = margin[BOTTOM] = space / 2;
} else if (margin[TOP] == AUTO) {
margin[TOP] = containing_block->height -
top - border[TOP].width - padding[TOP] -
height - padding[BOTTOM] -
border[BOTTOM].width - margin[BOTTOM] -
bottom;
} else if (margin[BOTTOM] == AUTO) {
margin[BOTTOM] = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
bottom;
} else {
bottom = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM];
}
} else {
if (margin[TOP] == AUTO)
margin[TOP] = 0;
if (margin[BOTTOM] == AUTO)
margin[BOTTOM] = 0;
if (top == AUTO && height == AUTO && bottom != AUTO) {
height = box->height;
top = containing_block->height -
margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM] - bottom;
} else if (top == AUTO && height != AUTO && bottom == AUTO) {
top = static_top;
bottom = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM];
} else if (top != AUTO && height == AUTO && bottom == AUTO) {
height = box->height;
bottom = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM];
} else if (top == AUTO && height != AUTO && bottom != AUTO) {
top = containing_block->height -
margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM] - bottom;
} else if (top != AUTO && height == AUTO && bottom != AUTO) {
height = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - padding[BOTTOM] -
border[BOTTOM].width - margin[BOTTOM] -
bottom;
} else if (top != AUTO && height != AUTO && bottom == AUTO) {
bottom = containing_block->height -
top - margin[TOP] - border[TOP].width -
padding[TOP] - height -
padding[BOTTOM] - border[BOTTOM].width -
margin[BOTTOM];
}
}
#ifdef LAYOUT_DEBUG
LOG(("%i + %i + %i + %i + %i + %i + %i + %i + %i = %i",
top, margin[TOP], border[TOP].width, padding[TOP],
height, padding[BOTTOM], border[BOTTOM].width,
margin[BOTTOM], bottom,
containing_block->height));
#endif
box->y = top + margin[TOP] + border[TOP].width - cy;
if (containing_block->type == BOX_BLOCK ||
containing_block->type == BOX_INLINE_BLOCK ||
containing_block->type == BOX_TABLE_CELL) {
/* Block-level ancestor => reset container's height */
containing_block->height -= containing_block->padding[TOP] +
containing_block->padding[BOTTOM];
} else {
/** \todo Inline ancestors */
}
box->height = height;
layout_apply_minmax_height(box, containing_block);
return true;
}
/**
* Compute box offsets for a relatively or absolutely positioned box with
* respect to a box.
*
* \param box box to compute offsets for
* \param containing_block box to compute percentages with respect to
* \param top updated to top offset, or AUTO
* \param right updated to right offset, or AUTO
* \param bottom updated to bottom offset, or AUTO
* \param left updated to left offset, or AUTO
*
* See CSS 2.1 9.3.2. containing_block must have width and height.
*/
void layout_compute_offsets(struct box *box,
struct box *containing_block,
int *top, int *right, int *bottom, int *left)
{
uint32_t type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
assert(containing_block->width != UNKNOWN_WIDTH &&
containing_block->width != AUTO &&
containing_block->height != AUTO);
/* left */
type = css_computed_left(box->style, &value, &unit);
if (type == CSS_LEFT_SET) {
if (unit == CSS_UNIT_PCT) {
*left = FPCT_OF_INT_TOINT(value,
containing_block->width);
} else {
*left = FIXTOINT(nscss_len2px(value, unit, box->style));
}
} else {
*left = AUTO;
}
/* right */
type = css_computed_right(box->style, &value, &unit);
if (type == CSS_RIGHT_SET) {
if (unit == CSS_UNIT_PCT) {
*right = FPCT_OF_INT_TOINT(value,
containing_block->width);
} else {
*right = FIXTOINT(nscss_len2px(value, unit,
box->style));
}
} else {
*right = AUTO;
}
/* top */
type = css_computed_top(box->style, &value, &unit);
if (type == CSS_TOP_SET) {
if (unit == CSS_UNIT_PCT) {
*top = FPCT_OF_INT_TOINT(value,
containing_block->height);
} else {
*top = FIXTOINT(nscss_len2px(value, unit, box->style));
}
} else {
*top = AUTO;
}
/* bottom */
type = css_computed_bottom(box->style, &value, &unit);
if (type == CSS_BOTTOM_SET) {
if (unit == CSS_UNIT_PCT) {
*bottom = FPCT_OF_INT_TOINT(value,
containing_block->height);
} else {
*bottom = FIXTOINT(nscss_len2px(value, unit,
box->style));
}
} else {
*bottom = AUTO;
}
}
/**
* Find a box's bounding box relative to itself, i.e. the box's border edge box
*
* \param box box find bounding box of
* \param desc_x0 updated to left of box's bbox
* \param desc_y0 updated to top of box's bbox
* \param desc_x1 updated to right of box's bbox
* \param desc_y1 updated to bottom of box's bbox
*/
static void layout_get_box_bbox(struct box *box, int *desc_x0, int *desc_y0,
int *desc_x1, int *desc_y1)
{
*desc_x0 = -box->border[LEFT].width;
*desc_y0 = -box->border[TOP].width;
*desc_x1 = box->padding[LEFT] + box->width + box->padding[RIGHT] +
box->border[RIGHT].width;
*desc_y1 = box->padding[TOP] + box->height + box->padding[BOTTOM] +
box->border[BOTTOM].width;
/* To stop the top of text getting clipped when css line-height is
* reduced, we increase the top of the descendant bbox. */
if (box->type == BOX_BLOCK && box->style != NULL &&
css_computed_overflow_y(box->style) ==
CSS_OVERFLOW_VISIBLE &&
box->object == NULL) {
css_fixed font_size = 0;
css_unit font_unit = CSS_UNIT_PT;
int text_height;
css_computed_font_size(box->style, &font_size, &font_unit);
text_height = nscss_len2px(font_size, font_unit, box->style);
text_height = FIXTOINT(text_height * 3 / 4);
*desc_y0 = (*desc_y0 < -text_height) ? *desc_y0 : -text_height;
}
}
/**
* Apply changes to box descendant_[xy][01] values due to given child.
*
* \param box box to update
* \param child a box, which may affect box's descendant bbox
* \param off_x offset to apply to child->x coord to treat as child of box
* \param off_y offset to apply to child->y coord to treat as child of box
*/
static void layout_update_descendant_bbox(struct box *box, struct box *child,
int off_x, int off_y)
{
int child_desc_x0, child_desc_y0, child_desc_x1, child_desc_y1;
/* get coordinates of child relative to box */
int child_x = child->x - off_x;
int child_y = child->y - off_y;
bool html_object = (child->object &&
content_get_type(child->object) == CONTENT_HTML);
enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE;
enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE;
if (child->style != NULL) {
overflow_x = css_computed_overflow_x(child->style);
overflow_y = css_computed_overflow_y(child->style);
}
if (child->style == NULL ||
(child->style &&
overflow_x == CSS_OVERFLOW_VISIBLE &&
overflow_y == CSS_OVERFLOW_VISIBLE &&
html_object == false)) {
/* get child's descendant bbox relative to box */
child_desc_x0 = child_x + child->descendant_x0;
child_desc_y0 = child_y + child->descendant_y0;
child_desc_x1 = child_x + child->descendant_x1;
child_desc_y1 = child_y + child->descendant_y1;
} else {
/* child's descendants don't matter; use child's border edge */
layout_get_box_bbox(child, &child_desc_x0, &child_desc_y0,
&child_desc_x1, &child_desc_y1);
/* get the bbox relative to box */
child_desc_x0 += child_x;
child_desc_y0 += child_y;
child_desc_x1 += child_x;
child_desc_y1 += child_y;
}
/* increase box's descendant bbox to contain descendants */
if (child_desc_x0 < box->descendant_x0)
box->descendant_x0 = child_desc_x0;
if (child_desc_y0 < box->descendant_y0)
box->descendant_y0 = child_desc_y0;
if (box->descendant_x1 < child_desc_x1)
box->descendant_x1 = child_desc_x1;
if (box->descendant_y1 < child_desc_y1)
box->descendant_y1 = child_desc_y1;
}
/**
* Recursively calculate the descendant_[xy][01] values for a laid-out box tree
* and inform iframe browser windows of their size and position.
*
* \param box tree of boxes to update
*/
void layout_calculate_descendant_bboxes(struct box *box)
{
struct box *child;
assert((box->width != UNKNOWN_WIDTH) && (box->height != AUTO));
/* assert((box->width >= 0) && (box->height >= 0)); */
/* Initialise box's descendant box to border edge box */
layout_get_box_bbox(box, &box->descendant_x0, &box->descendant_y0,
&box->descendant_x1, &box->descendant_y1);
/* Extend it to contain HTML contents if box is replaced */
if (box->object && content_get_type(box->object) == CONTENT_HTML) {
if (box->descendant_x1 < content_get_width(box->object))
box->descendant_x1 = content_get_width(box->object);
if (box->descendant_y1 < content_get_height(box->object))
box->descendant_y1 = content_get_height(box->object);
}
if (box->iframe != NULL) {
int x, y;
box_coords(box, &x, &y);
browser_window_set_position(box->iframe, x, y);
browser_window_set_dimensions(box->iframe,
box->width, box->height);
browser_window_reformat(box->iframe, true,
box->width, box->height);
}
if (box->type == BOX_INLINE || box->type == BOX_TEXT)
return;
if (box->type == BOX_INLINE_END) {
box = box->inline_end;
for (child = box->next; child;
child = child->next) {
if (child->type == BOX_FLOAT_LEFT ||
child->type == BOX_FLOAT_RIGHT)
continue;
layout_update_descendant_bbox(box, child,
box->x, box->y);
if (child == box->inline_end)
break;
}
return;
}
if (box->flags & REPLACE_DIM)
/* Box's children aren't displayed if the box is replaced */
return;
for (child = box->children; child; child = child->next) {
if (child->type == BOX_FLOAT_LEFT ||
child->type == BOX_FLOAT_RIGHT)
continue;
layout_calculate_descendant_bboxes(child);
if (box->style && css_computed_overflow_x(box->style) ==
CSS_OVERFLOW_HIDDEN &&
css_computed_overflow_y(box->style) ==
CSS_OVERFLOW_HIDDEN)
continue;
layout_update_descendant_bbox(box, child, 0, 0);
}
for (child = box->float_children; child; child = child->next_float) {
assert(child->type == BOX_FLOAT_LEFT ||
child->type == BOX_FLOAT_RIGHT);
layout_calculate_descendant_bboxes(child);
layout_update_descendant_bbox(box, child, 0, 0);
}
if (box->list_marker) {
child = box->list_marker;
layout_calculate_descendant_bboxes(child);
layout_update_descendant_bbox(box, child, 0, 0);
}
}
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