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cd40c260b9
netsurf/render/html_redraw.c
Michael Drake cd40c260b9 Remove knockout from html_redraw, and use it in browser_window_redraw and thumbnail_redraw. 
svn path=/trunk/netsurf/; revision=11746
2011-02-21 14:48:55 +00:00

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/*
* Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004-2007 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2004-2007 Richard Wilson <info@tinct.net>
* Copyright 2005-2006 Adrian Lees <adrianl@users.sourceforge.net>
* Copyright 2006 Rob Kendrick <rjek@netsurf-browser.org>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
* Copyright 2009 Paul Blokus <paul_pl@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
* Redraw of a CONTENT_HTML (implementation).
*/
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "utils/config.h"
#include "content/content_protected.h"
#include "css/css.h"
#include "css/utils.h"
#include "desktop/gui.h"
#include "desktop/plotters.h"
#include "desktop/selection.h"
#include "desktop/textinput.h"
#include "desktop/options.h"
#include "desktop/print.h"
#include "desktop/search.h"
#include "desktop/scroll.h"
#include "image/bitmap.h"
#include "render/box.h"
#include "render/font.h"
#include "render/form.h"
#include "render/layout.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
static bool html_redraw_box(struct box *box, int x, int y,
const struct rect *clip, float scale,
colour current_background_color);
static bool html_redraw_box_children(struct box *box,
int x_parent, int y_parent, const struct rect *clip,
float scale, colour current_background_color);
static bool html_redraw_text_box(struct box *box, int x, int y,
const struct rect *clip, float scale,
colour current_background_color);
static bool html_redraw_caret(struct caret *caret,
colour current_background_color, float scale);
static bool html_redraw_borders(struct box *box, int x_parent, int y_parent,
int p_width, int p_height, const struct rect *clip,
float scale);
static bool html_redraw_inline_borders(struct box *box, struct rect b,
const struct rect *clip, float scale, bool first, bool last);
static bool html_redraw_border_plot(const int side, const int *p, colour c,
enum css_border_style_e style, int thickness, bool rectangular,
const struct rect *clip);
static bool html_redraw_checkbox(int x, int y, int width, int height,
bool selected);
static bool html_redraw_radio(int x, int y, int width, int height,
bool selected);
static bool html_redraw_file(int x, int y, int width, int height,
struct box *box, float scale, colour background_colour);
static bool html_redraw_background(int x, int y, struct box *box, float scale,
const struct rect *clip, colour *background_colour,
struct box *background);
static bool html_redraw_inline_background(int x, int y, struct box *box,
float scale, const struct rect *clip, struct rect b,
bool first, bool last, colour *background_colour);
static bool html_redraw_text_decoration(struct box *box,
int x_parent, int y_parent, float scale,
colour background_colour);
static bool html_redraw_text_decoration_inline(struct box *box, int x, int y,
float scale, colour colour, float ratio);
static bool html_redraw_text_decoration_block(struct box *box, int x, int y,
float scale, colour colour, float ratio);
bool html_redraw_debug = false;
/**
* Draw a CONTENT_HTML using the current set of plotters (plot).
*
* \param c content of type CONTENT_HTML
* \param x coordinate for top-left of redraw
* \param y coordinate for top-left of redraw
* \param width available width (not used for HTML redraw)
* \param height available height (not used for HTML redraw)
* \param clip clip rectangle
* \param scale scale for redraw
* \param background_colour the background colour
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw(struct content *c, int x, int y,
int width, int height, const struct rect *clip,
float scale, colour background_colour)
{
struct box *box;
bool result = true;
bool select, select_only;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = background_colour,
};
box = c->data.html.layout;
assert(box);
/* The select menu needs special treating because, when opened, it
* reaches beyond its layout box.
*/
select = false;
select_only = false;
if (current_redraw_browser != NULL &&
current_redraw_browser->visible_select_menu != NULL) {
struct form_control *control =
current_redraw_browser->visible_select_menu;
select = true;
/* check if the redraw rectangle is completely inside of the
select menu */
select_only = form_clip_inside_select_menu(control, scale,
clip);
}
if (!select_only) {
/* clear to background colour */
result = plot.clip(clip);
if (c->data.html.background_colour != NS_TRANSPARENT)
pstyle_fill_bg.fill_colour =
c->data.html.background_colour;
result &= plot.rectangle(clip->x0, clip->y0, clip->x1, clip->y1,
&pstyle_fill_bg);
result &= html_redraw_box(box, x, y, clip,
scale, pstyle_fill_bg.fill_colour);
}
if (select) {
int menu_x, menu_y;
box = current_redraw_browser->visible_select_menu->box;
box_coords(box, &menu_x, &menu_y);
menu_x -= box->border[LEFT].width;
menu_y += box->height + box->border[BOTTOM].width +
box->padding[BOTTOM] + box->padding[TOP];
result &= form_redraw_select_menu(
current_redraw_browser->visible_select_menu,
x + menu_x, y + menu_y,
current_redraw_browser->scale, clip);
}
return result;
}
/**
* Determine if a box has a background that needs drawing
*
* \param box Box to consider
* \return True if box has a background, false otherwise.
*/
static bool html_redraw_box_has_background(struct box *box)
{
if (box->background != NULL)
return true;
if (box->style != NULL) {
css_color colour;
css_computed_background_color(box->style, &colour);
if (nscss_color_is_transparent(colour) == false)
return true;
}
return false;
}
/**
* Find the background box for a box
*
* \param box Box to find background box for
* \return Pointer to background box, or NULL if there is none
*/
static struct box *html_redraw_find_bg_box(struct box *box)
{
/* Thanks to backwards compatibility, CSS defines the following:
*
* + If the box is for the root element and it has a background,
* use that (and then process the body box with no special case)
* + If the box is for the root element and it has no background,
* then use the background (if any) from the body element as if
* it were specified on the root. Then, when the box for the body
* element is processed, ignore the background.
* + For any other box, just use its own styling.
*/
if (box->parent == NULL) {
/* Root box */
if (html_redraw_box_has_background(box))
return box;
/* No background on root box: consider body box, if any */
if (box->children != NULL) {
if (html_redraw_box_has_background(box->children))
return box->children;
}
} else if (box->parent != NULL && box->parent->parent == NULL) {
/* Body box: only render background if root has its own */
if (html_redraw_box_has_background(box) &&
html_redraw_box_has_background(box->parent))
return box;
} else {
/* Any other box */
if (html_redraw_box_has_background(box))
return box;
}
return NULL;
}
/**
* Recursively draw a box.
*
* \param box box to draw
* \param x_parent coordinate of parent box
* \param y_parent coordinate of parent box
* \param clip clip rectangle
* \param scale scale for redraw
* \param current_background_color background colour under this box
* \param inline_depth depth of nested inlines inside an inline container
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw_box(struct box *box, int x_parent, int y_parent,
const struct rect *clip, float scale,
colour current_background_color)
{
int x, y;
int width, height;
int padding_left, padding_top, padding_width, padding_height;
int border_left, border_top, border_right, border_bottom;
struct rect r;
int x_scrolled, y_scrolled;
struct box *bg_box = NULL;
bool has_x_scroll, has_y_scroll;
if (html_redraw_printing && box->printed)
return true;
/* avoid trivial FP maths */
if (scale == 1.0) {
x = x_parent + box->x;
y = y_parent + box->y;
width = box->width;
height = box->height;
padding_left = box->padding[LEFT];
padding_top = box->padding[TOP];
padding_width = padding_left + box->width + box->padding[RIGHT];
padding_height = padding_top + box->height +
box->padding[BOTTOM];
border_left = box->border[LEFT].width;
border_top = box->border[TOP].width;
border_right = box->border[RIGHT].width;
border_bottom = box->border[BOTTOM].width;
} else {
x = (x_parent + box->x) * scale;
y = (y_parent + box->y) * scale;
width = box->width * scale;
height = box->height * scale;
/* left and top padding values are normally zero,
* so avoid trivial FP maths */
padding_left = box->padding[LEFT] ? box->padding[LEFT] * scale
: 0;
padding_top = box->padding[TOP] ? box->padding[TOP] * scale
: 0;
padding_width = (box->padding[LEFT] + box->width +
box->padding[RIGHT]) * scale;
padding_height = (box->padding[TOP] + box->height +
box->padding[BOTTOM]) * scale;
border_left = box->border[LEFT].width * scale;
border_top = box->border[TOP].width * scale;
border_right = box->border[RIGHT].width * scale;
border_bottom = box->border[BOTTOM].width * scale;
}
/* calculate rectangle covering this box and descendants */
if (box->style && css_computed_overflow(box->style) !=
CSS_OVERFLOW_VISIBLE) {
/* box contents clipped to box size */
r.x0 = x - border_left;
r.y0 = y - border_top;
r.x1 = x + padding_width + border_right;
r.y1 = y + padding_height + border_bottom;
} else {
/* box contents can hang out of the box; use descendant box */
if (scale == 1.0) {
r.x0 = x + box->descendant_x0;
r.y0 = y + box->descendant_y0;
r.x1 = x + box->descendant_x1 + 1;
r.y1 = y + box->descendant_y1 + 1;
} else {
r.x0 = x + box->descendant_x0 * scale;
r.y0 = y + box->descendant_y0 * scale;
r.x1 = x + box->descendant_x1 * scale + 1;
r.y1 = y + box->descendant_y1 * scale + 1;
}
if (!box->parent) {
/* root element */
int margin_left, margin_right;
int margin_top, margin_bottom;
if (scale == 1.0) {
margin_left = box->margin[LEFT];
margin_top = box->margin[TOP];
margin_right = box->margin[RIGHT];
margin_bottom = box->margin[BOTTOM];
} else {
margin_left = box->margin[LEFT] * scale;
margin_top = box->margin[TOP] * scale;
margin_right = box->margin[RIGHT] * scale;
margin_bottom = box->margin[BOTTOM] * scale;
}
r.x0 = x - border_left - margin_left < r.x0 ?
x - border_left - margin_left : r.x0;
r.y0 = y - border_top - margin_top < r.y0 ?
y - border_top - margin_top : r.y0;
r.x1 = x + padding_width + border_right +
margin_right > r.x1 ?
x + padding_width + border_right +
margin_right : r.x1;
r.y1 = y + padding_height + border_bottom +
margin_bottom > r.y1 ?
y + padding_height + border_bottom +
margin_bottom : r.y1;
}
}
/* return if the rectangle is completely outside the clip rectangle */
if (clip->y1 < r.y0 || r.y1 < clip->y0 ||
clip->x1 < r.x0 || r.x1 < clip->x0)
return true;
/*if the rectangle is under the page bottom but it can fit in a page,
don't print it now*/
if (html_redraw_printing) {
if (r.y1 > html_redraw_printing_border) {
if (r.y1 - r.y0 <= html_redraw_printing_border &&
(box->type == BOX_TEXT ||
box->type == BOX_TABLE_CELL
|| box->object || box->gadget)) {
/*remember the highest of all points from the
not printed elements*/
if (r.y0 < html_redraw_printing_top_cropped)
html_redraw_printing_top_cropped = r.y0;
return true;
}
}
else box->printed = true;/*it won't be printed anymore*/
}
/* if visibility is hidden render children only */
if (box->style && css_computed_visibility(box->style) ==
CSS_VISIBILITY_HIDDEN) {
if ((plot.group_start) && (!plot.group_start("hidden box")))
return false;
if (!html_redraw_box_children(box, x_parent, y_parent,
&r, scale, current_background_color))
return false;
return ((!plot.group_end) || (plot.group_end()));
}
if ((plot.group_start) && (!plot.group_start("vis box")))
return false;
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object) {
/* find intersection of clip rectangle and box */
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (clip->y1 < r.y1) r.y1 = clip->y1;
/* no point trying to draw 0-width/height boxes */
if (r.x0 == r.x1 || r.y0 == r.y1)
/* not an error */
return ((!plot.group_end) || (plot.group_end()));
/* clip to it */
if (!plot.clip(&r))
return false;
} else {
/* clip box unchanged */
r = *clip;
}
/* background colour and image for block level content and replaced
* inlines */
bg_box = html_redraw_find_bg_box(box);
/* bg_box == NULL implies that this box should not have
* its background rendered. Otherwise filter out linebreaks,
* optimize away non-differing inlines, only plot background
* for BOX_TEXT it's in an inline */
if (bg_box && bg_box->type != BOX_BR &&
bg_box->type != BOX_TEXT &&
bg_box->type != BOX_INLINE_END &&
(bg_box->type != BOX_INLINE || bg_box->object)) {
/* find intersection of clip box and border edge */
struct rect p;
p.x0 = x - border_left < r.x0 ? r.x0 : x - border_left;
p.y0 = y - border_top < r.y0 ? r.y0 : y - border_top;
p.x1 = x + padding_width + border_right < r.x1 ?
x + padding_width + border_right : r.x1;
p.y1 = y + padding_height + border_bottom < r.y1 ?
y + padding_height + border_bottom : r.y1;
if (!box->parent) {
/* Root element, special case:
* background covers margins too */
int m_left, m_top, m_right, m_bottom;
if (scale == 1.0) {
m_left = box->margin[LEFT];
m_top = box->margin[TOP];
m_right = box->margin[RIGHT];
m_bottom = box->margin[BOTTOM];
} else {
m_left = box->margin[LEFT] * scale;
m_top = box->margin[TOP] * scale;
m_right = box->margin[RIGHT] * scale;
m_bottom = box->margin[BOTTOM] * scale;
}
p.x0 = p.x0 - m_left < r.x0 ? r.x0 : p.x0 - m_left;
p.y0 = p.y0 - m_top < r.y0 ? r.y0 : p.y0 - m_top;
p.x1 = p.x1 + m_right < r.x1 ? p.x1 + m_right : r.x1;
p.y1 = p.y1 + m_bottom < r.y1 ? p.y1 + m_bottom : r.y1;
}
/* valid clipping rectangles only */
if ((p.x0 < p.x1) && (p.y0 < p.y1)) {
/* plot background */
if (!html_redraw_background(x, y, box, scale, &p,
&current_background_color, bg_box))
return false;
/* restore previous graphics window */
if (!plot.clip(&r))
return false;
}
}
/* borders for block level content and replaced inlines */
if (box->style && box->type != BOX_TEXT &&
box->type != BOX_INLINE_END &&
(box->type != BOX_INLINE || box->object) &&
(border_top || border_right ||
border_bottom || border_left)) {
if (!html_redraw_borders(box, x_parent, y_parent,
padding_width, padding_height, &r,
scale))
return false;
}
/* backgrounds and borders for non-replaced inlines */
if (box->style && box->type == BOX_INLINE && box->inline_end &&
(html_redraw_box_has_background(box) ||
border_top || border_right ||
border_bottom || border_left)) {
/* inline backgrounds and borders span other boxes and may
* wrap onto separate lines */
struct box *ib;
struct rect b; /* border edge rectangle */
struct rect p; /* clipped rect */
bool first = true;
int ib_x;
int ib_y = y;
int ib_p_width;
int ib_b_left, ib_b_right;
b.x0 = x - border_left;
b.x1 = x + padding_width + border_right;
b.y0 = y - border_top;
b.y1 = y + padding_height + border_bottom;
p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
for (ib = box; ib; ib = ib->next) {
/* to get extents of rectangle(s) associated with
* inline, cycle though all boxes in inline, skipping
* over floats */
if (ib->type == BOX_FLOAT_LEFT ||
ib->type == BOX_FLOAT_RIGHT)
continue;
if (scale == 1.0) {
ib_x = x_parent + ib->x;
ib_y = y_parent + ib->y;
ib_p_width = ib->padding[LEFT] + ib->width +
ib->padding[RIGHT];
ib_b_left = ib->border[LEFT].width;
ib_b_right = ib->border[RIGHT].width;
} else {
ib_x = (x_parent + ib->x) * scale;
ib_y = (y_parent + ib->y) * scale;
ib_p_width = (ib->padding[LEFT] + ib->width +
ib->padding[RIGHT]) * scale;
ib_b_left = ib->border[LEFT].width * scale;
ib_b_right = ib->border[RIGHT].width * scale;
}
if (ib->inline_new_line && ib != box) {
/* inline element has wrapped, plot background
* and borders */
if (!html_redraw_inline_background(
x, y, box, scale, &p, b,
first, false,
&current_background_color))
return false;
/* restore previous graphics window */
if (!plot.clip(&r))
return false;
if (!html_redraw_inline_borders(box, b, &r,
scale, first, false))
return false;
/* reset coords */
b.x0 = ib_x - ib_b_left;
b.y0 = ib_y - border_top - padding_top;
b.y1 = ib_y + padding_height - padding_top +
border_bottom;
p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
first = false;
}
/* increase width for current box */
b.x1 = ib_x + ib_p_width + ib_b_right;
p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
if (ib == box->inline_end)
/* reached end of BOX_INLINE span */
break;
}
/* plot background and borders for last rectangle of
* the inline */
if (!html_redraw_inline_background(x, ib_y, box, scale, &p, b,
first, true, &current_background_color))
return false;
/* restore previous graphics window */
if (!plot.clip(&r))
return false;
if (!html_redraw_inline_borders(box, b, &r, scale, first, true))
return false;
}
/* Debug outlines */
if (html_redraw_debug) {
int margin_left, margin_right;
int margin_top, margin_bottom;
if (scale == 1.0) {
/* avoid trivial fp maths */
margin_left = box->margin[LEFT];
margin_top = box->margin[TOP];
margin_right = box->margin[RIGHT];
margin_bottom = box->margin[BOTTOM];
} else {
margin_left = box->margin[LEFT] * scale;
margin_top = box->margin[TOP] * scale;
margin_right = box->margin[RIGHT] * scale;
margin_bottom = box->margin[BOTTOM] * scale;
}
/* Content edge -- blue */
if (!plot.rectangle(x + padding_left,
y + padding_top,
x + padding_left + width,
y + padding_top + height,
plot_style_content_edge))
return false;
/* Padding edge -- red */
if (!plot.rectangle(x, y,
x + padding_width, y + padding_height,
plot_style_padding_edge))
return false;
/* Margin edge -- yellow */
if (!plot.rectangle(
x - border_left - margin_left,
y - border_top - margin_top,
x + padding_width + border_right +
margin_right,
y + padding_height + border_bottom +
margin_bottom,
plot_style_margin_edge))
return false;
}
/* clip to the padding edge for objects, or boxes with overflow hidden
* or scroll */
if (box->object || (box->style && css_computed_overflow(box->style) !=
CSS_OVERFLOW_VISIBLE)) {
r.x0 = x;
r.y0 = y;
r.x1 = x + padding_width;
r.y1 = y + padding_height;
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (clip->y1 < r.y1) r.y1 = clip->y1;
if (r.x1 <= r.x0 || r.y1 <= r.y0)
return ((!plot.group_end) || (plot.group_end()));
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object) {
if (!plot.clip(&r))
return false;
}
}
/* text decoration */
if (box->type != BOX_TEXT && box->style &&
css_computed_text_decoration(box->style) !=
CSS_TEXT_DECORATION_NONE)
if (!html_redraw_text_decoration(box, x_parent, y_parent,
scale, current_background_color))
return false;
if (box->object && width != 0 && height != 0) {
x_scrolled = x - scroll_get_offset(box->scroll_x) * scale;
y_scrolled = y - scroll_get_offset(box->scroll_y) * scale;
if (!content_redraw(box->object,
x_scrolled + padding_left,
y_scrolled + padding_top,
width, height, &r, scale,
current_background_color))
return false;
} else if (box->gadget && box->gadget->type == GADGET_CHECKBOX) {
if (!html_redraw_checkbox(x + padding_left, y + padding_top,
width, height,
box->gadget->selected))
return false;
} else if (box->gadget && box->gadget->type == GADGET_RADIO) {
if (!html_redraw_radio(x + padding_left, y + padding_top,
width, height,
box->gadget->selected))
return false;
} else if (box->gadget && box->gadget->type == GADGET_FILE) {
if (!html_redraw_file(x + padding_left, y + padding_top,
width, height, box, scale,
current_background_color))
return false;
} else if (box->text) {
if (!html_redraw_text_box(box, x, y, &r, scale,
current_background_color))
return false;
} else {
if (!html_redraw_box_children(box, x_parent, y_parent, &r,
scale, current_background_color))
return false;
}
/* list marker */
if (box->list_marker)
if (!html_redraw_box(box->list_marker,
x_parent + box->x -
scroll_get_offset(box->scroll_x),
y_parent + box->y -
scroll_get_offset(box->scroll_y),
clip, scale, current_background_color))
return false;
/* scrollbars */
if (current_redraw_browser && ((box->style && box->type != BOX_BR &&
box->type != BOX_TABLE && box->type != BOX_INLINE &&
(css_computed_overflow(box->style) ==
CSS_OVERFLOW_SCROLL ||
css_computed_overflow(box->style) ==
CSS_OVERFLOW_AUTO)) || (box->object &&
content_get_type(box->object) == CONTENT_HTML))) {
has_x_scroll = box_hscrollbar_present(box);
has_y_scroll = box_vscrollbar_present(box);
if (!box_handle_scrollbars(current_redraw_browser, box,
has_x_scroll, has_y_scroll))
return false;
if (box->scroll_x != NULL)
scroll_redraw(box->scroll_x,
x_parent + box->x,
y_parent + box->y + box->padding[TOP] +
box->height + box->padding[BOTTOM] -
SCROLLBAR_WIDTH, clip, scale);
if (box->scroll_y != NULL)
scroll_redraw(box->scroll_y,
x_parent + box->x + box->padding[LEFT] +
box->width + box->padding[RIGHT] -
SCROLLBAR_WIDTH,
y_parent + box->y, clip, scale);
}
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object)
if (!plot.clip(clip))
return false;
return ((!plot.group_end) || (plot.group_end()));
}
/**
* Draw the various children of a box.
*
* \param box box to draw children of
* \param x_parent coordinate of parent box
* \param y_parent coordinate of parent box
* \param clip clip rectangle
* \param scale scale for redraw
* \param current_background_color background colour under this box
* \return true if successful, false otherwise
*/
bool html_redraw_box_children(struct box *box, int x_parent, int y_parent,
const struct rect *clip, float scale,
colour current_background_color)
{
struct box *c;
for (c = box->children; c; c = c->next) {
if (c->type != BOX_FLOAT_LEFT && c->type != BOX_FLOAT_RIGHT)
if (!html_redraw_box(c,
x_parent + box->x -
scroll_get_offset(box->scroll_x),
y_parent + box->y -
scroll_get_offset(box->scroll_y),
clip, scale, current_background_color))
return false;
}
for (c = box->float_children; c; c = c->next_float)
if (!html_redraw_box(c,
x_parent + box->x -
scroll_get_offset(box->scroll_x),
y_parent + box->y -
scroll_get_offset(box->scroll_y),
clip, scale, current_background_color))
return false;
return true;
}
/**
* Redraw the text content of a box, possibly partially highlighted
* because the text has been selected, or matches a search operation.
*
* \param box box with text content
* \param x x co-ord of box
* \param y y co-ord of box
* \param clip current clip rectangle
* \param scale current scale setting (1.0 = 100%)
* \param current_background_color
* \return true iff successful and redraw should proceed
*/
bool html_redraw_text_box(struct box *box, int x, int y,
const struct rect *clip, float scale,
colour current_background_color)
{
bool excluded = (box->object != NULL);
plot_font_style_t fstyle;
font_plot_style_from_css(box->style, &fstyle);
fstyle.background = current_background_color;
if (!text_redraw(box->text, box->length, box->byte_offset,
box->space, &fstyle, x, y,
clip, box->height, scale, excluded))
return false;
/* does this textbox contain the ghost caret? */
if (ghost_caret.defined && box == ghost_caret.text_box) {
if (!html_redraw_caret(&ghost_caret, current_background_color,
scale))
return false;
}
return true;
}
/**
* Redraw a short text string, complete with highlighting
* (for selection/search) and ghost caret
*
* \param utf8_text pointer to UTF-8 text string
* \param utf8_len length of string, in bytes
* \param offset byte offset within textual representation
* \param space indicates whether string is followed by a space
* \param fstyle text style to use
* \param x x ordinate at which to plot text
* \param y y ordinate at which to plot text
* \param clip pointer to current clip rectangle
* \param height height of text string
* \param scale current display scale (1.0 = 100%)
* \param excluded exclude this text string from the selection
* \return true iff successful and redraw should proceed
*/
bool text_redraw(const char *utf8_text, size_t utf8_len,
size_t offset, bool space, const plot_font_style_t *fstyle,
int x, int y, const struct rect *clip, int height,
float scale, bool excluded)
{
bool highlighted = false;
/* is this box part of a selection? */
if (!excluded && current_redraw_browser) {
unsigned len = utf8_len + (space ? 1 : 0);
unsigned start_idx;
unsigned end_idx;
/* first try the browser window's current selection */
if (selection_defined(current_redraw_browser->sel) &&
selection_highlighted(current_redraw_browser->sel,
offset, offset + len, &start_idx, &end_idx)) {
highlighted = true;
}
/* what about the current search operation, if any? */
if (!highlighted && (current_redraw_browser->search_context
!= NULL) &&
gui_search_term_highlighted(
current_redraw_browser->window,
offset, offset + len,
&start_idx, &end_idx,
current_redraw_browser->
search_context)) {
highlighted = true;
}
/* \todo make search terms visible within selected text */
if (highlighted) {
struct rect r;
unsigned endtxt_idx = end_idx;
bool clip_changed = false;
bool text_visible = true;
int startx, endx;
plot_style_t *pstyle_fill_hback = plot_style_fill_white;
plot_font_style_t fstyle_hback = *fstyle;
if (end_idx > utf8_len) {
/* adjust for trailing space, not present in
* utf8_text */
assert(end_idx == utf8_len + 1);
endtxt_idx = utf8_len;
}
if (!nsfont.font_width(fstyle, utf8_text, start_idx,
&startx))
startx = 0;
if (!nsfont.font_width(fstyle, utf8_text, endtxt_idx,
&endx))
endx = 0;
/* is there a trailing space that should be highlighted
* as well? */
if (end_idx > utf8_len) {
int spc_width;
/* \todo is there a more elegant/efficient
* solution? */
if (nsfont.font_width(fstyle, " ", 1,
&spc_width))
endx += spc_width;
}
if (scale != 1.0) {
startx *= scale;
endx *= scale;
}
/* draw any text preceding highlighted portion */
if (start_idx > 0 &&
!plot.text(x, y + (int) (height * 0.75 * scale),
utf8_text, start_idx,
fstyle))
return false;
/* decide whether highlighted portion is to be
* white-on-black or black-on-white */
if ((fstyle->background & 0x808080) == 0x808080)
pstyle_fill_hback = plot_style_fill_black;
/* highlighted portion */
if (!plot.rectangle(x + startx, y, x + endx,
y + height * scale,
pstyle_fill_hback))
return false;
if (start_idx > 0) {
int px0 = max(x + startx, clip->x0);
int px1 = min(x + endx, clip->x1);
if (px0 < px1) {
r.x0 = px0;
r.y0 = clip->y0;
r.x1 = px1;
r.y1 = clip->y1;
if (!plot.clip(&r))
return false;
clip_changed = true;
} else {
text_visible = false;
}
}
fstyle_hback.background =
pstyle_fill_hback->fill_colour;
fstyle_hback.foreground =
pstyle_fill_hback->fill_colour ^ 0xffffff;
if (text_visible &&
!plot.text(x, y + (int) (height * 0.75 * scale),
utf8_text, endtxt_idx,
&fstyle_hback))
return false;
/* draw any text succeeding highlighted portion */
if (endtxt_idx < utf8_len) {
int px0 = max(x + endx, clip->x0);
if (px0 < clip->x1) {
r.x0 = px0;
r.y0 = clip->y0;
r.x1 = clip->x1;
r.y1 = clip->y1;
if (!plot.clip(&r))
return false;
clip_changed = true;
if (!plot.text(x, y + (int)
(height * 0.75 * scale),
utf8_text, utf8_len,
fstyle))
return false;
}
}
if (clip_changed &&
!plot.clip(clip))
return false;
}
}
if (!highlighted) {
if (!plot.text(x, y + (int) (height * 0.75 * scale),
utf8_text, utf8_len,
fstyle))
return false;
}
return true;
}
/**
* Draw text caret.
*
* \param c structure describing text caret
* \param current_background_color background colour under the caret
* \param scale current scale setting (1.0 = 100%)
* \return true iff successful and redraw should proceed
*/
bool html_redraw_caret(struct caret *c, colour current_background_color,
float scale)
{
int xc = c->x, y = c->y;
int h = c->height - 1;
int w = (h + 7) / 8;
return (plot.line(xc * scale, y * scale,
xc * scale, (y + h) * scale,
plot_style_caret) &&
plot.line((xc - w) * scale, y * scale,
(xc + w) * scale, y * scale,
plot_style_caret) &&
plot.line((xc - w) * scale, (y + h) * scale,
(xc + w) * scale, (y + h) * scale,
plot_style_caret));
}
/**
* Draw borders for a box.
*
* \param box box to draw
* \param x_parent coordinate of left padding edge of parent of box
* \param y_parent coordinate of top padding edge of parent of box
* \param p_width width of padding box
* \param p_height height of padding box
* \param scale scale for redraw
* \return true if successful, false otherwise
*/
bool html_redraw_borders(struct box *box, int x_parent, int y_parent,
int p_width, int p_height, const struct rect *clip, float scale)
{
unsigned int sides[] = { LEFT, RIGHT, TOP, BOTTOM };
int top = box->border[TOP].width;
int right = box->border[RIGHT].width;
int bottom = box->border[BOTTOM].width;
int left = box->border[LEFT].width;
int x, y;
unsigned int i, side;
int p[8]; /* Box border vertices */
int z[8]; /* Border vertices */
bool square_end_1 = false;
bool square_end_2 = false;
x = x_parent + box->x;
y = y_parent + box->y;
if (scale != 1.0) {
top *= scale;
right *= scale;
bottom *= scale;
left *= scale;
x *= scale;
y *= scale;
}
assert(box->style);
/* Calculate border vertices
*
* A----------------------+
* | \ / |
* | B--------------+ |
* | | | |
* | +--------------C |
* | / \ |
* +----------------------D
*/
p[0] = x - left; p[1] = y - top; /* A */
p[2] = x; p[3] = y; /* B */
p[4] = x + p_width; p[5] = y + p_height; /* C */
p[6] = x + p_width + right; p[7] = y + p_height + bottom; /* D */
for (i = 0; i != 4; i++) {
colour col = 0;
side = sides[i]; /* plot order */
if (box->border[side].width == 0 ||
nscss_color_is_transparent(box->border[side].c))
continue;
switch (side) {
case LEFT:
square_end_1 = (top == 0);
square_end_2 = (bottom == 0);
z[0] = p[0]; z[1] = p[7];
z[2] = p[2]; z[3] = p[5];
z[4] = p[2]; z[5] = p[3];
z[6] = p[0]; z[7] = p[1];
if (nscss_color_is_transparent(box->border[TOP].c) ==
false &&
box->border[TOP].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang top corner fully,
* if top border is opaque */
z[5] -= top;
square_end_1 = true;
}
if (nscss_color_is_transparent(box->border[BOTTOM].c) ==
false &&
box->border[BOTTOM].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang bottom corner fully,
* if bottom border is opaque */
z[3] += bottom;
square_end_2 = true;
}
col = nscss_color_to_ns(box->border[side].c);
if (!html_redraw_border_plot(side, z, col,
box->border[side].style,
box->border[side].width * scale,
square_end_1 && square_end_2, clip))
return false;
break;
case RIGHT:
square_end_1 = (top == 0);
square_end_2 = (bottom == 0);
z[0] = p[6]; z[1] = p[1];
z[2] = p[4]; z[3] = p[3];
z[4] = p[4]; z[5] = p[5];
z[6] = p[6]; z[7] = p[7];
if (nscss_color_is_transparent(box->border[TOP].c) ==
false &&
box->border[TOP].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang top corner fully,
* if top border is opaque */
z[3] -= top;
square_end_1 = true;
}
if (nscss_color_is_transparent(box->border[BOTTOM].c) ==
false &&
box->border[BOTTOM].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang bottom corner fully,
* if bottom border is opaque */
z[5] += bottom;
square_end_2 = true;
}
col = nscss_color_to_ns(box->border[side].c);
if (!html_redraw_border_plot(side, z, col,
box->border[side].style,
box->border[side].width * scale,
square_end_1 && square_end_2, clip))
return false;
break;
case TOP:
if (clip->y0 > p[3])
/* clip rectangle is below border; nothing to
* plot */
continue;
square_end_1 = (left == 0);
square_end_2 = (right == 0);
z[0] = p[2]; z[1] = p[3];
z[2] = p[0]; z[3] = p[1];
z[4] = p[6]; z[5] = p[1];
z[6] = p[4]; z[7] = p[3];
if (box->border[TOP].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[TOP].c ==
box->border[LEFT].c) {
/* don't bother overlapping left corner if
* it's the same colour anyway */
z[2] += left;
square_end_1 = true;
}
if (box->border[TOP].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[TOP].c ==
box->border[RIGHT].c) {
/* don't bother overlapping right corner if
* it's the same colour anyway */
z[4] -= right;
square_end_2 = true;
}
col = nscss_color_to_ns(box->border[side].c);
if (!html_redraw_border_plot(side, z, col,
box->border[side].style,
box->border[side].width * scale,
square_end_1 && square_end_2, clip))
return false;
break;
case BOTTOM:
if (clip->y1 < p[5])
/* clip rectangle is above border; nothing to
* plot */
continue;
square_end_1 = (left == 0);
square_end_2 = (right == 0);
z[0] = p[4]; z[1] = p[5];
z[2] = p[6]; z[3] = p[7];
z[4] = p[0]; z[5] = p[7];
z[6] = p[2]; z[7] = p[5];
if (box->border[BOTTOM].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[BOTTOM].c ==
box->border[LEFT].c) {
/* don't bother overlapping left corner if
* it's the same colour anyway */
z[4] += left;
square_end_1 = true;
}
if (box->border[BOTTOM].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[BOTTOM].c ==
box->border[RIGHT].c) {
/* don't bother overlapping right corner if
* it's the same colour anyway */
z[2] -= right;
square_end_2 = true;
}
col = nscss_color_to_ns(box->border[side].c);
if (!html_redraw_border_plot(side, z, col,
box->border[side].style,
box->border[side].width * scale,
square_end_1 && square_end_2, clip))
return false;
break;
default:
assert(side == TOP || side == BOTTOM ||
side == LEFT || side == RIGHT);
break;
}
}
return true;
}
/**
* Draw an inline's borders.
*
* \param box BOX_INLINE which created the border
* \param b coordinates of border edge rectangle
* \param scale scale for redraw
* \param first true if this is the first rectangle associated with the inline
* \param last true if this is the last rectangle associated with the inline
* \return true if successful, false otherwise
*/
bool html_redraw_inline_borders(struct box *box, struct rect b,
const struct rect *clip, float scale, bool first, bool last)
{
int top = box->border[TOP].width;
int right = box->border[RIGHT].width;
int bottom = box->border[BOTTOM].width;
int left = box->border[LEFT].width;
colour col;
int p[8]; /* Box border vertices */
int z[8]; /* Border vertices */
bool square_end_1;
bool square_end_2;
if (scale != 1.0) {
top *= scale;
right *= scale;
bottom *= scale;
left *= scale;
}
/* Calculate border vertices
*
* A----------------------+
* | \ / |
* | B--------------+ |
* | | | |
* | +--------------C |
* | / \ |
* +----------------------D
*/
p[0] = b.x0; p[1] = b.y0; /* A */
p[2] = first ? b.x0 + left : b.x0; p[3] = b.y0 + top; /* B */
p[4] = last ? b.x1 - right : b.x1; p[5] = b.y1 - bottom; /* C */
p[6] = b.x1; p[7] = b.y1; /* D */
assert(box->style);
/* Left */
square_end_1 = (top == 0);
square_end_2 = (bottom == 0);
if (left != 0 && first && nscss_color_is_transparent(
box->border[LEFT].c) == false) {
col = nscss_color_to_ns(box->border[LEFT].c);
z[0] = p[0]; z[1] = p[7];
z[2] = p[2]; z[3] = p[5];
z[4] = p[2]; z[5] = p[3];
z[6] = p[0]; z[7] = p[1];
if (nscss_color_is_transparent(box->border[TOP].c) == false &&
box->border[TOP].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang top corner fully,
* if top border is opaque */
z[5] -= top;
square_end_1 = true;
}
if (nscss_color_is_transparent(box->border[BOTTOM].c) ==
false &&
box->border[BOTTOM].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang bottom corner fully,
* if bottom border is opaque */
z[3] += bottom;
square_end_2 = true;
}
if (!html_redraw_border_plot(LEFT, z, col,
box->border[LEFT].style,
left, square_end_1 && square_end_2, clip))
return false;
}
/* Right */
square_end_1 = (top == 0);
square_end_2 = (bottom == 0);
if (right != 0 && last && nscss_color_is_transparent(
box->border[RIGHT].c) == false) {
col = nscss_color_to_ns(box->border[RIGHT].c);
z[0] = p[6]; z[1] = p[1];
z[2] = p[4]; z[3] = p[3];
z[4] = p[4]; z[5] = p[5];
z[6] = p[6]; z[7] = p[7];
if (nscss_color_is_transparent(box->border[TOP].c) == false &&
box->border[TOP].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang top corner fully,
* if top border is opaque */
z[3] -= top;
square_end_1 = true;
}
if (nscss_color_is_transparent(box->border[BOTTOM].c) ==
false &&
box->border[BOTTOM].style !=
CSS_BORDER_STYLE_DOUBLE) {
/* make border overhang bottom corner fully,
* if bottom border is opaque */
z[5] += bottom;
square_end_2 = true;
}
if (!html_redraw_border_plot(RIGHT, z, col,
box->border[RIGHT].style,
right, square_end_1 && square_end_2, clip))
return false;
}
/* Top */
square_end_1 = (left == 0);
square_end_2 = (right == 0);
if (top != 0 && nscss_color_is_transparent(
box->border[TOP].c) == false) {
col = nscss_color_to_ns(box->border[TOP].c);
z[0] = p[2]; z[1] = p[3];
z[2] = p[0]; z[3] = p[1];
z[4] = p[6]; z[5] = p[1];
z[6] = p[4]; z[7] = p[3];
if (first && box->border[TOP].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[TOP].c ==
box->border[LEFT].c) {
/* don't bother overlapping left corner if
* it's the same colour anyway */
z[2] += left;
square_end_1 = true;
}
if (last && box->border[TOP].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[TOP].c ==
box->border[RIGHT].c) {
/* don't bother overlapping right corner if
* it's the same colour anyway */
z[4] -= right;
square_end_2 = true;
}
if (!html_redraw_border_plot(TOP, z, col,
box->border[TOP].style,
top, square_end_1 && square_end_2, clip))
return false;
}
/* Bottom */
square_end_1 = (left == 0);
square_end_2 = (right == 0);
if (bottom != 0 && nscss_color_is_transparent(
box->border[BOTTOM].c) == false) {
col = nscss_color_to_ns(box->border[BOTTOM].c);
z[0] = p[4]; z[1] = p[5];
z[2] = p[6]; z[3] = p[7];
z[4] = p[0]; z[5] = p[7];
z[6] = p[2]; z[7] = p[5];
if (first && box->border[BOTTOM].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[BOTTOM].c ==
box->border[LEFT].c) {
/* don't bother overlapping left corner if
* it's the same colour anyway */
z[4] += left;
square_end_1 = true;
}
if (last && box->border[BOTTOM].style ==
CSS_BORDER_STYLE_SOLID &&
box->border[BOTTOM].c ==
box->border[RIGHT].c) {
/* don't bother overlapping right corner if
* it's the same colour anyway */
z[2] -= right;
square_end_2 = true;
}
if (!html_redraw_border_plot(BOTTOM, z, col,
box->border[BOTTOM].style,
bottom, square_end_1 && square_end_2, clip))
return false;
}
return true;
}
static plot_style_t plot_style_bdr = {
.stroke_type = PLOT_OP_TYPE_DASH,
};
static plot_style_t plot_style_fillbdr = {
.fill_type = PLOT_OP_TYPE_SOLID,
};
static plot_style_t plot_style_fillbdr_dark = {
.fill_type = PLOT_OP_TYPE_SOLID,
};
static plot_style_t plot_style_fillbdr_light = {
.fill_type = PLOT_OP_TYPE_SOLID,
};
static plot_style_t plot_style_fillbdr_ddark = {
.fill_type = PLOT_OP_TYPE_SOLID,
};
static plot_style_t plot_style_fillbdr_dlight = {
.fill_type = PLOT_OP_TYPE_SOLID,
};
/**
* Draw one border.
*
* \param side index of border side (TOP, RIGHT, BOTTOM, LEFT)
* \param p array of precomputed border vertices
* \param c colour for border
* \param style border line style
* \param thickness border thickness
* \param rectangular whether border is rectangular
* \return true if successful, false otherwise
*/
bool html_redraw_border_plot(const int side, const int *p, colour c,
enum css_border_style_e style, int thickness, bool rectangular,
const struct rect *clip)
{
int z[8]; /* Vertices of border part */
unsigned int light = side;
plot_style_t *plot_style_bdr_in;
plot_style_t *plot_style_bdr_out;
if (c == NS_TRANSPARENT)
return true;
plot_style_bdr.stroke_type = PLOT_OP_TYPE_DASH;
plot_style_bdr.stroke_colour = c;
plot_style_bdr.stroke_width = thickness;
plot_style_fillbdr.fill_colour = c;
plot_style_fillbdr_dark.fill_colour = darken_colour(c);
plot_style_fillbdr_light.fill_colour = lighten_colour(c);
plot_style_fillbdr_ddark.fill_colour = double_darken_colour(c);
plot_style_fillbdr_dlight.fill_colour = double_lighten_colour(c);
switch (style) {
case CSS_BORDER_STYLE_DOTTED:
plot_style_bdr.stroke_type = PLOT_OP_TYPE_DOT;
/* fall through */
case CSS_BORDER_STYLE_DASHED:
if (!plot.line((p[0] + p[2]) / 2,
(p[1] + p[3]) / 2,
(p[4] + p[6]) / 2,
(p[5] + p[7]) / 2,
&plot_style_bdr))
return false;
break;
case CSS_BORDER_STYLE_SOLID:
/* fall through to default */
default:
if (rectangular || thickness == 1) {
int x0, y0, x1, y1;
if (side == TOP || side == RIGHT) {
x0 = p[2]; y0 = p[3];
x1 = p[6]; y1 = p[7];
x1 = ((side == TOP) && (p[4] - p[6] != 0)) ?
x1 + p[4] - p[6] : x1;
} else {
x0 = p[6]; y0 = p[7];
x1 = p[2]; y1 = p[3];
y1 = ((side == LEFT) && (p[1] - p[3] != 0)) ?
y1 + p[1] - p[3] : y1;
}
/* find intersection of clip rectangle and border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
&plot_style_fillbdr))
return false;
}
} else {
if (!plot.polygon(p, 4, &plot_style_fillbdr))
return false;
}
break;
case CSS_BORDER_STYLE_DOUBLE:
z[0] = p[0];
z[1] = p[1];
z[2] = (p[0] * 2 + p[2]) / 3;
z[3] = (p[1] * 2 + p[3]) / 3;
z[4] = (p[6] * 2 + p[4]) / 3;
z[5] = (p[7] * 2 + p[5]) / 3;
z[6] = p[6];
z[7] = p[7];
if (!plot.polygon(z, 4, &plot_style_fillbdr))
return false;
z[0] = p[2];
z[1] = p[3];
z[2] = (p[2] * 2 + p[0]) / 3;
z[3] = (p[3] * 2 + p[1]) / 3;
z[4] = (p[4] * 2 + p[6]) / 3;
z[5] = (p[5] * 2 + p[7]) / 3;
z[6] = p[4];
z[7] = p[5];
if (!plot.polygon(z, 4, &plot_style_fillbdr))
return false;
break;
case CSS_BORDER_STYLE_GROOVE:
light = 3 - light;
/* fall through */
case CSS_BORDER_STYLE_RIDGE:
/* choose correct colours for each part of the border line */
if (light <= 1) {
plot_style_bdr_in = &plot_style_fillbdr_dark;
plot_style_bdr_out = &plot_style_fillbdr_light;
} else {
plot_style_bdr_in = &plot_style_fillbdr_light;
plot_style_bdr_out = &plot_style_fillbdr_dark;
}
/* Render border */
if ((rectangular || thickness == 2) && thickness != 1) {
/* Border made up from two parts and can be plotted
* with rectangles */
int x0, y0, x1, y1;
/* First part */
if (side == TOP || side == RIGHT) {
x0 = (p[0] + p[2]) / 2; y0 = (p[1] + p[3]) / 2;
x1 = p[6]; y1 = p[7];
} else {
x0 = p[6]; y0 = p[7];
x1 = (p[0] + p[2]) / 2; y1 = (p[1] + p[3]) / 2;
}
/* find intersection of clip rectangle and border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_in))
return false;
}
/* Second part */
if (side == TOP || side == RIGHT) {
x0 = p[2]; y0 = p[3];
x1 = (p[6] + p[4]) / 2; y1 = (p[7] + p[5]) / 2;
} else {
x0 = (p[6] + p[4]) / 2; y0 = (p[7] + p[5]) / 2;
x1 = p[2]; y1 = p[3];
}
/* find intersection of clip rectangle and border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_out))
return false;
}
} else if (thickness == 1) {
/* Border made up from one part which can be plotted
* as a rectangle */
int x0, y0, x1, y1;
if (side == TOP || side == RIGHT) {
x0 = p[2]; y0 = p[3];
x1 = p[6]; y1 = p[7];
x1 = ((side == TOP) && (p[4] - p[6] != 0)) ?
x1 + p[4] - p[6] : x1;
/* find intersection of clip rectangle and
* border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_in))
return false;
}
} else {
x0 = p[6]; y0 = p[7];
x1 = p[2]; y1 = p[3];
y1 = ((side == LEFT) && (p[1] - p[3] != 0)) ?
y1 + p[1] - p[3] : y1;
/* find intersection of clip rectangle and
* border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_out))
return false;
}
}
} else {
/* Border made up from two parts and can't be plotted
* with rectangles */
z[0] = p[0];
z[1] = p[1];
z[2] = (p[0] + p[2]) / 2;
z[3] = (p[1] + p[3]) / 2;
z[4] = (p[6] + p[4]) / 2;
z[5] = (p[7] + p[5]) / 2;
z[6] = p[6];
z[7] = p[7];
if (!plot.polygon(z, 4, plot_style_bdr_in))
return false;
z[0] = p[2];
z[1] = p[3];
z[6] = p[4];
z[7] = p[5];
if (!plot.polygon(z, 4, plot_style_bdr_out))
return false;
}
break;
case CSS_BORDER_STYLE_INSET:
light = (light + 2) % 4;
/* fall through */
case CSS_BORDER_STYLE_OUTSET:
/* choose correct colours for each part of the border line */
switch (light) {
case 0:
plot_style_bdr_in = &plot_style_fillbdr_light;
plot_style_bdr_out = &plot_style_fillbdr_dlight;
break;
case 1:
plot_style_bdr_in = &plot_style_fillbdr_ddark;
plot_style_bdr_out = &plot_style_fillbdr_dark;
break;
case 2:
plot_style_bdr_in = &plot_style_fillbdr_dark;
plot_style_bdr_out = &plot_style_fillbdr_ddark;
break;
case 3:
plot_style_bdr_in = &plot_style_fillbdr_dlight;
plot_style_bdr_out = &plot_style_fillbdr_light;
break;
default:
plot_style_bdr_in = &plot_style_fillbdr;
plot_style_bdr_out = &plot_style_fillbdr;
break;
}
/* Render border */
if ((rectangular || thickness == 2) && thickness != 1) {
/* Border made up from two parts and can be plotted
* with rectangles */
int x0, y0, x1, y1;
/* First part */
if (side == TOP || side == RIGHT) {
x0 = (p[0] + p[2]) / 2; y0 = (p[1] + p[3]) / 2;
x1 = p[6]; y1 = p[7];
} else {
x0 = p[6]; y0 = p[7];
x1 = (p[0] + p[2]) / 2; y1 = (p[1] + p[3]) / 2;
}
/* find intersection of clip rectangle and border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_in))
return false;
}
/* Second part */
if (side == TOP || side == RIGHT) {
x0 = p[2]; y0 = p[3];
x1 = (p[6] + p[4]) / 2; y1 = (p[7] + p[5]) / 2;
} else {
x0 = (p[6] + p[4]) / 2; y0 = (p[7] + p[5]) / 2;
x1 = p[2]; y1 = p[3];
}
/* find intersection of clip rectangle and border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_out))
return false;
}
} else if (thickness == 1) {
/* Border made up from one part which can be plotted
* as a rectangle */
int x0, y0, x1, y1;
if (side == TOP || side == RIGHT) {
x0 = p[2]; y0 = p[3];
x1 = p[6]; y1 = p[7];
x1 = ((side == TOP) && (p[4] - p[6] != 0)) ?
x1 + p[4] - p[6] : x1;
/* find intersection of clip rectangle and
* border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_in))
return false;
}
} else {
x0 = p[6]; y0 = p[7];
x1 = p[2]; y1 = p[3];
y1 = ((side == LEFT) && (p[1] - p[3] != 0)) ?
y1 + p[1] - p[3] : y1;
/* find intersection of clip rectangle and
* border */
x0 = (clip->x0 > x0) ? clip->x0 : x0;
y0 = (clip->y0 > y0) ? clip->y0 : y0;
x1 = (clip->x1 < x1) ? clip->x1 : x1;
y1 = (clip->y1 < y1) ? clip->y1 : y1;
if ((x0 < x1) && (y0 < y1)) {
/* valid clip rectangles only */
if (!plot.rectangle(x0, y0, x1, y1,
plot_style_bdr_out))
return false;
}
}
} else {
/* Border made up from two parts and can't be plotted
* with rectangles */
z[0] = p[0];
z[1] = p[1];
z[2] = (p[0] + p[2]) / 2;
z[3] = (p[1] + p[3]) / 2;
z[4] = (p[6] + p[4]) / 2;
z[5] = (p[7] + p[5]) / 2;
z[6] = p[6];
z[7] = p[7];
if (!plot.polygon(z, 4, plot_style_bdr_in))
return false;
z[0] = p[2];
z[1] = p[3];
z[6] = p[4];
z[7] = p[5];
if (!plot.polygon(z, 4, plot_style_bdr_out))
return false;
}
break;
}
return true;
}
/**
* Plot a checkbox.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of checkbox
* \param height dimensions of checkbox
* \param selected the checkbox is selected
* \return true if successful, false otherwise
*/
bool html_redraw_checkbox(int x, int y, int width, int height, bool selected)
{
double z = width * 0.15;
if (z == 0)
z = 1;
if (!(plot.rectangle(x, y, x + width, y + height,
plot_style_fill_wbasec) &&
plot.line(x, y, x + width, y, plot_style_stroke_darkwbasec) &&
plot.line(x, y, x, y + height, plot_style_stroke_darkwbasec) &&
plot.line(x + width, y, x + width, y + height,
plot_style_stroke_lightwbasec) &&
plot.line(x, y + height, x + width, y + height,
plot_style_stroke_lightwbasec)))
return false;
if (selected) {
if (width < 12 || height < 12) {
/* render a solid box instead of a tick */
if (!plot.rectangle(x + z + z, y + z + z,
x + width - z, y + height - z,
plot_style_fill_wblobc))
return false;
} else {
/* render a tick, as it'll fit comfortably */
if (!(plot.line(x + width - z,
y + z,
x + (z * 3),
y + height - z,
plot_style_stroke_wblobc) &&
plot.line(x + (z * 3),
y + height - z,
x + z + z,
y + (height / 2),
plot_style_stroke_wblobc)))
return false;
}
}
return true;
}
/**
* Plot a radio icon.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of radio icon
* \param height dimensions of radio icon
* \param selected the radio icon is selected
* \return true if successful, false otherwise
*/
bool html_redraw_radio(int x, int y, int width, int height, bool selected)
{
/* plot background of radio button */
if (!plot.disc(x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1,
plot_style_fill_wbasec))
return false;
/* plot dark arc */
if (!plot.arc(x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1,
45,
225,
plot_style_fill_darkwbasec))
return false;
/* plot light arc */
if (!plot.arc(x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1,
225,
45,
plot_style_fill_lightwbasec))
return false;
if (selected) {
/* plot selection blob */
if (!plot.disc(x + width * 0.5,
y + height * 0.5,
width * 0.3 - 1,
plot_style_fill_wblobc))
return false;
}
return true;
}
/**
* Plot a file upload input.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of input
* \param height dimensions of input
* \param box box of input
* \param scale scale for redraw
* \param background_colour current background colour
* \return true if successful, false otherwise
*/
bool html_redraw_file(int x, int y, int width, int height,
struct box *box, float scale, colour background_colour)
{
int text_width;
const char *text;
size_t length;
plot_font_style_t fstyle;
font_plot_style_from_css(box->style, &fstyle);
fstyle.background = background_colour;
if (box->gadget->value)
text = box->gadget->value;
else
text = messages_get("Form_Drop");
length = strlen(text);
if (!nsfont.font_width(&fstyle, text, length, &text_width))
return false;
text_width *= scale;
if (width < text_width + 8)
x = x + width - text_width - 4;
else
x = x + 4;
return plot.text(x, y + height * 0.75, text, length, &fstyle);
}
/**
* Plot background images.
*
* \param x coordinate of box
* \param y coordinate of box
* \param box box to draw background image of
* \param scale scale for redraw
* \param clip current clip rectangle
* \param background_colour current background colour
* \param background box containing background details (usually ::box)
* \return true if successful, false otherwise
*
* The reason for the presence of ::background is the backwards compatibility
* mess that is backgrounds on <body>. The background will be drawn relative
* to ::box, using the background information contained within ::background.
*/
bool html_redraw_background(int x, int y, struct box *box, float scale,
const struct rect *clip, colour *background_colour,
struct box *background)
{
bool repeat_x = false;
bool repeat_y = false;
bool plot_colour = true;
bool plot_content;
bool clip_to_children = false;
struct box *clip_box = box;
int ox = x, oy = y;
int width, height;
css_fixed hpos = 0, vpos = 0;
css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
struct box *parent;
struct rect r = *clip;
css_color bgcol;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = *background_colour,
};
if (html_redraw_printing && option_remove_backgrounds)
return true;
plot_content = (background->background != NULL);
if (plot_content) {
if (!box->parent) {
/* Root element, special case:
* background origin calc. is based on margin box */
x -= box->margin[LEFT] * scale;
y -= box->margin[TOP] * scale;
width = box->margin[LEFT] + box->padding[LEFT] +
box->width + box->padding[RIGHT] +
box->margin[RIGHT];
height = box->margin[TOP] + box->padding[TOP] +
box->height + box->padding[BOTTOM] +
box->margin[BOTTOM];
} else {
width = box->padding[LEFT] + box->width +
box->padding[RIGHT];
height = box->padding[TOP] + box->height +
box->padding[BOTTOM];
}
/* handle background-repeat */
switch (css_computed_background_repeat(background->style)) {
case CSS_BACKGROUND_REPEAT_REPEAT:
{
struct bitmap *bmp = content_get_bitmap(
background->background);
repeat_x = repeat_y = true;
/* optimisation: only plot the colour if
* bitmap is not opaque */
if (bmp != NULL)
plot_colour = !bitmap_get_opaque(bmp);
}
break;
case CSS_BACKGROUND_REPEAT_REPEAT_X:
repeat_x = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_Y:
repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_NO_REPEAT:
break;
default:
break;
}
/* handle background-position */
css_computed_background_position(background->style,
&hpos, &hunit, &vpos, &vunit);
if (hunit == CSS_UNIT_PCT) {
x += (width -
content_get_width(background->background)) *
scale * FIXTOFLT(hpos) / 100.;
} else {
x += (int) (FIXTOFLT(nscss_len2px(hpos, hunit,
background->style)) * scale);
}
if (vunit == CSS_UNIT_PCT) {
y += (height -
content_get_height(background->background)) *
scale * FIXTOFLT(vpos) / 100.;
} else {
y += (int) (FIXTOFLT(nscss_len2px(vpos, vunit,
background->style)) * scale);
}
}
/* special case for table rows as their background needs
* to be clipped to all the cells */
if (box->type == BOX_TABLE_ROW) {
css_fixed h = 0, v = 0;
css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX;
for (parent = box->parent;
((parent) && (parent->type != BOX_TABLE));
parent = parent->parent);
assert(parent && (parent->style));
css_computed_border_spacing(parent->style, &h, &hu, &v, &vu);
clip_to_children = (h > 0) || (v > 0);
if (clip_to_children)
clip_box = box->children;
}
for (; clip_box; clip_box = clip_box->next) {
/* clip to child boxes if needed */
if (clip_to_children) {
struct bitmap *bmp = NULL;
assert(clip_box->type == BOX_TABLE_CELL);
/* update clip.* to the child cell */
r.x0 = ox + (clip_box->x * scale);
r.y0 = oy + (clip_box->y * scale);
r.x1 = r.x0 + (clip_box->padding[LEFT] +
clip_box->width +
clip_box->padding[RIGHT]) * scale;
r.y1 = r.y0 + (clip_box->padding[TOP] +
clip_box->height +
clip_box->padding[BOTTOM]) * scale;
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (r.x1 > clip->x1) r.x1 = clip->x1;
if (r.y1 > clip->y1) r.y1 = clip->y1;
if (clip_box->background != NULL)
bmp = content_get_bitmap(clip_box->background);
css_computed_background_color(clip_box->style, &bgcol);
/* <td> attributes override <tr> */
if ((r.x0 >= r.x1) || (r.y0 >= r.y1) ||
(nscss_color_is_transparent(bgcol) ==
false) ||
(bmp != NULL && bitmap_get_opaque(bmp)))
continue;
}
/* plot the background colour */
css_computed_background_color(background->style, &bgcol);
if (nscss_color_is_transparent(bgcol) == false) {
*background_colour = nscss_color_to_ns(bgcol);
pstyle_fill_bg.fill_colour = *background_colour;
if (plot_colour)
if (!plot.rectangle(r.x0, r.y0, r.x1, r.y1,
&pstyle_fill_bg))
return false;
}
/* and plot the image */
if (plot_content) {
width = content_get_width(background->background);
height = content_get_height(background->background);
if (!repeat_x) {
if (r.x0 < x)
r.x0 = x;
if (r.x1 > x + width * scale)
r.x1 = x + width * scale;
}
if (!repeat_y) {
if (r.y0 < y)
r.y0 = y;
if (r.y1 > y + height * scale)
r.y1 = y + height * scale;
}
/* valid clipping rectangles only */
if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
if (!plot.clip(&r))
return false;
if (!content_redraw_tiled(
background->background, x, y,
ceilf(width * scale),
ceilf(height * scale), &r,
scale, *background_colour,
repeat_x, repeat_y))
return false;
}
}
/* only <tr> rows being clipped to child boxes loop */
if (!clip_to_children)
return true;
}
return true;
}
/**
* Plot an inline's background and/or background image.
*
* \param x coordinate of box
* \param y coordinate of box
* \param box BOX_INLINE which created the background
* \param scale scale for redraw
* \param clip coordinates of clip rectangle
* \param b coordinates of border edge rectangle
* \param first true if this is the first rectangle associated with the inline
* \param last true if this is the last rectangle associated with the inline
* \param background_colour updated to current background colour if plotted
* \return true if successful, false otherwise
*/
bool html_redraw_inline_background(int x, int y, struct box *box, float scale,
const struct rect *clip, struct rect b, bool first, bool last,
colour *background_colour)
{
struct rect r = *clip;
bool repeat_x = false;
bool repeat_y = false;
bool plot_colour = true;
bool plot_content;
css_fixed hpos = 0, vpos = 0;
css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
css_color bgcol;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = *background_colour,
};
plot_content = (box->background != NULL);
if (html_redraw_printing && option_remove_backgrounds)
return true;
if (plot_content) {
/* handle background-repeat */
switch (css_computed_background_repeat(box->style)) {
case CSS_BACKGROUND_REPEAT_REPEAT:
{
struct bitmap *bmp =
content_get_bitmap(box->background);
repeat_x = repeat_y = true;
/* optimisation: only plot the colour if
* bitmap is not opaque */
if (bmp != NULL)
plot_colour = !bitmap_get_opaque(bmp);
}
break;
case CSS_BACKGROUND_REPEAT_REPEAT_X:
repeat_x = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_Y:
repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_NO_REPEAT:
break;
default:
break;
}
/* handle background-position */
css_computed_background_position(box->style,
&hpos, &hunit, &vpos, &vunit);
if (hunit == CSS_UNIT_PCT) {
x += (b.x1 - b.x0 -
content_get_width(box->background) *
scale) * FIXTOFLT(hpos) / 100.;
if (!repeat_x && ((hpos < 2 && !first) ||
(hpos > 98 && !last))){
plot_content = false;
}
} else {
x += (int) (FIXTOFLT(nscss_len2px(hpos, hunit,
box->style)) * scale);
}
if (vunit == CSS_UNIT_PCT) {
y += (b.y1 - b.y0 -
content_get_height(box->background) *
scale) * FIXTOFLT(vpos) / 100.;
} else {
y += (int) (FIXTOFLT(nscss_len2px(vpos, vunit,
box->style)) * scale);
}
}
/* plot the background colour */
css_computed_background_color(box->style, &bgcol);
if (nscss_color_is_transparent(bgcol) == false) {
*background_colour = nscss_color_to_ns(bgcol);
pstyle_fill_bg.fill_colour = *background_colour;
if (plot_colour)
if (!plot.rectangle(r.x0, r.y0, r.x1, r.y1,
&pstyle_fill_bg))
return false;
}
/* and plot the image */
if (plot_content) {
int width = content_get_width(box->background);
int height = content_get_height(box->background);
if (!repeat_x) {
if (r.x0 < x)
r.x0 = x;
if (r.x1 > x + width * scale)
r.x1 = x + width * scale;
}
if (!repeat_y) {
if (r.y0 < y)
r.y0 = y;
if (r.y1 > y + height * scale)
r.y1 = y + height * scale;
}
/* valid clipping rectangles only */
if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
if (!plot.clip(&r))
return false;
if (!content_redraw_tiled(box->background, x, y,
ceilf(width * scale),
ceilf(height * scale), &r,
scale, *background_colour,
repeat_x, repeat_y))
return false;
}
}
return true;
}
/**
* Plot text decoration for a box.
*
* \param box box to plot decorations for
* \param x_parent x coordinate of parent of box
* \param y_parent y coordinate of parent of box
* \param scale scale for redraw
* \param background_colour current background colour
* \return true if successful, false otherwise
*/
bool html_redraw_text_decoration(struct box *box,
int x_parent, int y_parent, float scale,
colour background_colour)
{
static const enum css_text_decoration_e decoration[] = {
CSS_TEXT_DECORATION_UNDERLINE, CSS_TEXT_DECORATION_OVERLINE,
CSS_TEXT_DECORATION_LINE_THROUGH };
static const float line_ratio[] = { 0.9, 0.1, 0.5 };
colour fgcol;
unsigned int i;
css_color col;
css_computed_color(box->style, &col);
fgcol = nscss_color_to_ns(col);
/* antialias colour for under/overline */
if (html_redraw_printing == false)
fgcol = blend_colour(background_colour, fgcol);
if (box->type == BOX_INLINE) {
if (!box->inline_end)
return true;
for (i = 0; i != NOF_ELEMENTS(decoration); i++)
if (css_computed_text_decoration(box->style) &
decoration[i])
if (!html_redraw_text_decoration_inline(box,
x_parent, y_parent, scale,
fgcol, line_ratio[i]))
return false;
} else {
for (i = 0; i != NOF_ELEMENTS(decoration); i++)
if (css_computed_text_decoration(box->style) &
decoration[i])
if (!html_redraw_text_decoration_block(box,
x_parent + box->x,
y_parent + box->y,
scale,
fgcol, line_ratio[i]))
return false;
}
return true;
}
/**
* Plot text decoration for an inline box.
*
* \param box box to plot decorations for, of type BOX_INLINE
* \param x x coordinate of parent of box
* \param y y coordinate of parent of box
* \param scale scale for redraw
* \param colour colour for decorations
* \param ratio position of line as a ratio of line height
* \return true if successful, false otherwise
*/
bool html_redraw_text_decoration_inline(struct box *box, int x, int y,
float scale, colour colour, float ratio)
{
struct box *c;
plot_style_t plot_style_box = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = colour,
};
for (c = box->next;
c && c != box->inline_end;
c = c->next) {
if (c->type != BOX_TEXT)
continue;
if (!plot.line((x + c->x) * scale,
(y + c->y + c->height * ratio) * scale,
(x + c->x + c->width) * scale,
(y + c->y + c->height * ratio) * scale,
&plot_style_box))
return false;
}
return true;
}
/**
* Plot text decoration for an non-inline box.
*
* \param box box to plot decorations for, of type other than BOX_INLINE
* \param x x coordinate of box
* \param y y coordinate of box
* \param scale scale for redraw
* \param colour colour for decorations
* \param ratio position of line as a ratio of line height
* \return true if successful, false otherwise
*/
bool html_redraw_text_decoration_block(struct box *box, int x, int y,
float scale, colour colour, float ratio)
{
struct box *c;
plot_style_t plot_style_box = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = colour,
};
/* draw through text descendants */
for (c = box->children; c; c = c->next) {
if (c->type == BOX_TEXT) {
if (!plot.line((x + c->x) * scale,
(y + c->y + c->height * ratio) * scale,
(x + c->x + c->width) * scale,
(y + c->y + c->height * ratio) * scale,
&plot_style_box))
return false;
} else if (c->type == BOX_INLINE_CONTAINER ||
c->type == BOX_BLOCK) {
if (!html_redraw_text_decoration_block(c,
x + c->x, y + c->y,
scale, colour, ratio))
return false;
}
}
return true;
}
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