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netsurf/render/table.c
Vincent Sanders c105738fa3 Change LOG() macro to be varadic 
This changes the LOG macro to be varadic removing the need for all
callsites to have double bracketing and allows for future improvement
on how we use the logging macros.

The callsites were changed with coccinelle and the changes checked by
hand. Compile tested for several frontends but not all.

A formatting annotation has also been added which allows the compiler
to check the parameters and types passed to the logging.
2015-05-28 16:08:46 +01:00

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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2005 Richard Wilson <info@tinct.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
* Table processing and layout (implementation).
*/
#include <assert.h>
#include <dom/dom.h>
#include "css/css.h"
#include "css/utils.h"
#include "render/box.h"
#include "render/table.h"
#include "utils/log.h"
#include "utils/talloc.h"
/* Define to enable verbose table debug */
#undef TABLE_DEBUG
/**
* Container for border values during table border calculations
*/
struct border {
enum css_border_style_e style; /**< border-style */
enum css_border_color_e color; /**< border-color type */
css_color c; /**< border-color value */
css_fixed width; /**< border-width length */
css_unit unit; /**< border-width units */
};
static void table_used_left_border_for_cell(struct box *cell);
static void table_used_top_border_for_cell(struct box *cell);
static void table_used_right_border_for_cell(struct box *cell);
static void table_used_bottom_border_for_cell(struct box *cell);
static bool table_border_is_more_eyecatching(const struct border *a,
box_type a_src, const struct border *b, box_type b_src);
static void table_cell_top_process_table(struct box *table, struct border *a,
box_type *a_src);
static bool table_cell_top_process_group(struct box *cell, struct box *group,
struct border *a, box_type *a_src);
static bool table_cell_top_process_row(struct box *cell, struct box *row,
struct border *a, box_type *a_src);
/**
* Determine the column width types for a table.
*
* \param table box of type BOX_TABLE
* \return true on success, false on memory exhaustion
*
* The table->col array is allocated and type and width are filled in for each
* column.
*/
bool table_calculate_column_types(struct box *table)
{
unsigned int i, j;
struct column *col;
struct box *row_group, *row, *cell;
if (table->col)
/* table->col already constructed, for example frameset table */
return true;
table->col = col = talloc_array(table, struct column, table->columns);
if (!col)
return false;
for (i = 0; i != table->columns; i++) {
col[i].type = COLUMN_WIDTH_UNKNOWN;
col[i].width = 0;
col[i].positioned = true;
}
/* 1st pass: 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) {
enum css_width_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
assert(cell->type == BOX_TABLE_CELL);
assert(cell->style);
if (cell->columns != 1)
continue;
i = cell->start_column;
if (css_computed_position(cell->style) !=
CSS_POSITION_ABSOLUTE &&
css_computed_position(cell->style) !=
CSS_POSITION_FIXED) {
col[i].positioned = false;
}
type = css_computed_width(cell->style, &value, &unit);
/* fixed width takes priority over any other width type */
if (col[i].type != COLUMN_WIDTH_FIXED &&
type == CSS_WIDTH_SET && unit != CSS_UNIT_PCT) {
col[i].type = COLUMN_WIDTH_FIXED;
col[i].width = FIXTOINT(nscss_len2px(value, unit,
cell->style));
if (col[i].width < 0)
col[i].width = 0;
continue;
}
if (col[i].type != COLUMN_WIDTH_UNKNOWN)
continue;
if (type == CSS_WIDTH_SET && unit == CSS_UNIT_PCT) {
col[i].type = COLUMN_WIDTH_PERCENT;
col[i].width = FIXTOINT(value);
if (col[i].width < 0)
col[i].width = 0;
} else if (type == CSS_WIDTH_AUTO) {
col[i].type = COLUMN_WIDTH_AUTO;
}
}
/* 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 fixed_columns = 0, percent_columns = 0,
auto_columns = 0, unknown_columns = 0;
int fixed_width = 0, percent_width = 0;
enum css_width_e type;
css_fixed value = 0;
css_unit unit = CSS_UNIT_PX;
if (cell->columns == 1)
continue;
i = cell->start_column;
for (j = i; j < i + cell->columns; j++) {
col[j].positioned = false;
}
/* count column types in spanned cells */
for (j = 0; j != cell->columns; j++) {
if (col[i + j].type == COLUMN_WIDTH_FIXED) {
fixed_width += col[i + j].width;
fixed_columns++;
} else if (col[i + j].type == COLUMN_WIDTH_PERCENT) {
percent_width += col[i + j].width;
percent_columns++;
} else if (col[i + j].type == COLUMN_WIDTH_AUTO) {
auto_columns++;
} else {
unknown_columns++;
}
}
if (!unknown_columns)
continue;
type = css_computed_width(cell->style, &value, &unit);
/* if cell is fixed width, and all spanned columns are fixed
* or unknown width, split extra width among unknown columns */
if (type == CSS_WIDTH_SET && unit != CSS_UNIT_PCT &&
fixed_columns + unknown_columns ==
cell->columns) {
int width = (FIXTOFLT(nscss_len2px(value, unit,
cell->style)) - fixed_width) /
unknown_columns;
if (width < 0)
width = 0;
for (j = 0; j != cell->columns; j++) {
if (col[i + j].type == COLUMN_WIDTH_UNKNOWN) {
col[i + j].type = COLUMN_WIDTH_FIXED;
col[i + j].width = width;
}
}
}
/* as above for percentage width */
if (type == CSS_WIDTH_SET && unit == CSS_UNIT_PCT &&
percent_columns + unknown_columns ==
cell->columns) {
int width = (FIXTOFLT(value) -
percent_width) / unknown_columns;
if (width < 0)
width = 0;
for (j = 0; j != cell->columns; j++) {
if (col[i + j].type == COLUMN_WIDTH_UNKNOWN) {
col[i + j].type = COLUMN_WIDTH_PERCENT;
col[i + j].width = width;
}
}
}
}
/* use AUTO if no width type was specified */
for (i = 0; i != table->columns; i++) {
if (col[i].type == COLUMN_WIDTH_UNKNOWN)
col[i].type = COLUMN_WIDTH_AUTO;
}
#ifdef TABLE_DEBUG
for (i = 0; i != table->columns; i++)
LOG("table %p, column %u: type %s, width %i", table, i, ((const char *[]){
"UNKNOWN",
"FIXED",
"AUTO",
"PERCENT",
"RELATIVE"
})[col[i].type], col[i].width);
#endif
return true;
}
/**
* Calculate used values of border-{trbl}-{style,color,width} for table cells.
*
* \param cell Table cell to consider
*
* \post \a cell's border array is populated
*/
void table_used_border_for_cell(struct box *cell)
{
int side;
assert(cell->type == BOX_TABLE_CELL);
if (css_computed_border_collapse(cell->style) ==
CSS_BORDER_COLLAPSE_SEPARATE) {
css_fixed width = 0;
css_unit unit = CSS_UNIT_PX;
/* Left border */
cell->border[LEFT].style =
css_computed_border_left_style(cell->style);
css_computed_border_left_color(cell->style,
&cell->border[LEFT].c);
css_computed_border_left_width(cell->style, &width, &unit);
cell->border[LEFT].width =
FIXTOINT(nscss_len2px(width, unit, cell->style));
/* Top border */
cell->border[TOP].style =
css_computed_border_top_style(cell->style);
css_computed_border_top_color(cell->style,
&cell->border[TOP].c);
css_computed_border_top_width(cell->style, &width, &unit);
cell->border[TOP].width =
FIXTOINT(nscss_len2px(width, unit, cell->style));
/* Right border */
cell->border[RIGHT].style =
css_computed_border_right_style(cell->style);
css_computed_border_right_color(cell->style,
&cell->border[RIGHT].c);
css_computed_border_right_width(cell->style, &width, &unit);
cell->border[RIGHT].width =
FIXTOINT(nscss_len2px(width, unit, cell->style));
/* Bottom border */
cell->border[BOTTOM].style =
css_computed_border_bottom_style(cell->style);
css_computed_border_bottom_color(cell->style,
&cell->border[BOTTOM].c);
css_computed_border_bottom_width(cell->style, &width, &unit);
cell->border[BOTTOM].width =
FIXTOINT(nscss_len2px(width, unit, cell->style));
} else {
/* Left border */
table_used_left_border_for_cell(cell);
/* Top border */
table_used_top_border_for_cell(cell);
/* Right border */
table_used_right_border_for_cell(cell);
/* Bottom border */
table_used_bottom_border_for_cell(cell);
}
/* Finally, ensure that any borders configured as
* hidden or none have zero width. (c.f. layout_find_dimensions) */
for (side = 0; side != 4; side++) {
if (cell->border[side].style == CSS_BORDER_STYLE_HIDDEN ||
cell->border[side].style ==
CSS_BORDER_STYLE_NONE)
cell->border[side].width = 0;
}
}
/******************************************************************************
* Helpers for used border calculations *
******************************************************************************/
/**
* Calculate used values of border-left-{style,color,width}
*
* \param cell Table cell to consider
*/
void table_used_left_border_for_cell(struct box *cell)
{
struct border a, b;
box_type a_src, b_src;
/** \todo Need column and column_group, too */
/* Initialise to computed left border for cell */
a.style = css_computed_border_left_style(cell->style);
a.color = css_computed_border_left_color(cell->style, &a.c);
css_computed_border_left_width(cell->style, &a.width, &a.unit);
a.width = nscss_len2px(a.width, a.unit, cell->style);
a.unit = CSS_UNIT_PX;
a_src = BOX_TABLE_CELL;
if (cell->prev != NULL || cell->start_column != 0) {
/* Cell to the left -- consider its right border */
struct box *prev = NULL;
if (cell->prev == NULL) {
struct box *row;
/* Spanned from a previous row in current row group */
for (row = cell->parent; row != NULL; row = row->prev) {
for (prev = row->children; prev != NULL;
prev = prev->next) {
if (prev->start_column +
prev->columns ==
cell->start_column)
break;
}
if (prev != NULL)
break;
}
assert(prev != NULL);
} else {
prev = cell->prev;
}
b.style = css_computed_border_right_style(prev->style);
b.color = css_computed_border_right_color(prev->style, &b.c);
css_computed_border_right_width(prev->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, prev->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_CELL;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
} else {
/* First cell in row, so consider rows and row group */
struct box *row = cell->parent;
struct box *group = row->parent;
struct box *table = group->parent;
unsigned int rows = cell->rows;
while (rows-- > 0 && row != NULL) {
/* Spanned rows -- consider their left border */
b.style = css_computed_border_left_style(row->style);
b.color = css_computed_border_left_color(
row->style, &b.c);
css_computed_border_left_width(
row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(&a, a_src,
&b, b_src)) {
a = b;
a_src = b_src;
}
row = row->next;
}
/** \todo can cells span row groups? */
/* Row group -- consider its left border */
b.style = css_computed_border_left_style(group->style);
b.color = css_computed_border_left_color(group->style, &b.c);
css_computed_border_left_width(group->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
/* The table itself -- consider its left border */
b.style = css_computed_border_left_style(table->style);
b.color = css_computed_border_left_color(table->style, &b.c);
css_computed_border_left_width(table->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, table->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
}
/* a now contains the used left border for the cell */
cell->border[LEFT].style = a.style;
cell->border[LEFT].c = a.c;
cell->border[LEFT].width =
FIXTOINT(nscss_len2px(a.width, a.unit, cell->style));
}
/**
* Calculate used values of border-top-{style,color,width}
*
* \param cell Table cell to consider
*/
void table_used_top_border_for_cell(struct box *cell)
{
struct border a, b;
box_type a_src, b_src;
struct box *row = cell->parent;
bool process_group = false;
/* Initialise to computed top border for cell */
a.style = css_computed_border_top_style(cell->style);
css_computed_border_top_color(cell->style, &a.c);
css_computed_border_top_width(cell->style, &a.width, &a.unit);
a.width = nscss_len2px(a.width, a.unit, cell->style);
a.unit = CSS_UNIT_PX;
a_src = BOX_TABLE_CELL;
/* Top border of row */
b.style = css_computed_border_top_style(row->style);
css_computed_border_top_color(row->style, &b.c);
css_computed_border_top_width(row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
if (row->prev != NULL) {
/* Consider row(s) above */
while (table_cell_top_process_row(cell, row->prev,
&a, &a_src) == false) {
if (row->prev->prev == NULL) {
/* Consider row group */
process_group = true;
break;
} else {
row = row->prev;
}
}
} else {
process_group = true;
}
if (process_group) {
struct box *group = row->parent;
/* Top border of row group */
b.style = css_computed_border_top_style(group->style);
b.color = css_computed_border_top_color(group->style, &b.c);
css_computed_border_top_width(group->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
if (group->prev == NULL) {
/* Top border of table */
table_cell_top_process_table(group->parent, &a, &a_src);
} else {
/* Process previous group(s) */
while (table_cell_top_process_group(cell, group->prev,
&a, &a_src) == false) {
if (group->prev->prev == NULL) {
/* Top border of table */
table_cell_top_process_table(
group->parent,
&a, &a_src);
break;
} else {
group = group->prev;
}
}
}
}
/* a now contains the used top border for the cell */
cell->border[TOP].style = a.style;
cell->border[TOP].c = a.c;
cell->border[TOP].width =
FIXTOINT(nscss_len2px(a.width, a.unit, cell->style));
}
/**
* Calculate used values of border-right-{style,color,width}
*
* \param cell Table cell to consider
*/
void table_used_right_border_for_cell(struct box *cell)
{
struct border a, b;
box_type a_src, b_src;
/** \todo Need column and column_group, too */
/* Initialise to computed right border for cell */
a.style = css_computed_border_right_style(cell->style);
css_computed_border_right_color(cell->style, &a.c);
css_computed_border_right_width(cell->style, &a.width, &a.unit);
a.width = nscss_len2px(a.width, a.unit, cell->style);
a.unit = CSS_UNIT_PX;
a_src = BOX_TABLE_CELL;
if (cell->next != NULL || cell->start_column + cell->columns !=
cell->parent->parent->parent->columns) {
/* Cell is not at right edge of table -- no right border */
a.style = CSS_BORDER_STYLE_NONE;
a.width = 0;
a.unit = CSS_UNIT_PX;
} else {
/* Last cell in row, so consider rows and row group */
struct box *row = cell->parent;
struct box *group = row->parent;
struct box *table = group->parent;
unsigned int rows = cell->rows;
while (rows-- > 0 && row != NULL) {
/* Spanned rows -- consider their right border */
b.style = css_computed_border_right_style(row->style);
b.color = css_computed_border_right_color(
row->style, &b.c);
css_computed_border_right_width(
row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(&a, a_src,
&b, b_src)) {
a = b;
a_src = b_src;
}
row = row->next;
}
/** \todo can cells span row groups? */
/* Row group -- consider its right border */
b.style = css_computed_border_right_style(group->style);
b.color = css_computed_border_right_color(group->style, &b.c);
css_computed_border_right_width(group->style,
&b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
/* The table itself -- consider its right border */
b.style = css_computed_border_right_style(table->style);
b.color = css_computed_border_right_color(table->style, &b.c);
css_computed_border_right_width(table->style,
&b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, table->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
}
/* a now contains the used right border for the cell */
cell->border[RIGHT].style = a.style;
cell->border[RIGHT].c = a.c;
cell->border[RIGHT].width =
FIXTOINT(nscss_len2px(a.width, a.unit, cell->style));
}
/**
* Calculate used values of border-bottom-{style,color,width}
*
* \param cell Table cell to consider
*/
void table_used_bottom_border_for_cell(struct box *cell)
{
struct border a, b;
box_type a_src, b_src;
struct box *row = cell->parent;
unsigned int rows = cell->rows;
/* Initialise to computed bottom border for cell */
a.style = css_computed_border_bottom_style(cell->style);
css_computed_border_bottom_color(cell->style, &a.c);
css_computed_border_bottom_width(cell->style, &a.width, &a.unit);
a.width = nscss_len2px(a.width, a.unit, cell->style);
a.unit = CSS_UNIT_PX;
a_src = BOX_TABLE_CELL;
while (rows-- > 0 && row != NULL)
row = row->next;
/** \todo Can cells span row groups? */
if (row != NULL) {
/* Cell is not at bottom edge of table -- no bottom border */
a.style = CSS_BORDER_STYLE_NONE;
a.width = 0;
a.unit = CSS_UNIT_PX;
} else {
/* Cell at bottom of table, so consider row and row group */
struct box *row = cell->parent;
struct box *group = row->parent;
struct box *table = group->parent;
/* Bottom border of row */
b.style = css_computed_border_bottom_style(row->style);
b.color = css_computed_border_bottom_color(row->style, &b.c);
css_computed_border_bottom_width(row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
/* Row group -- consider its bottom border */
b.style = css_computed_border_bottom_style(group->style);
b.color = css_computed_border_bottom_color(group->style, &b.c);
css_computed_border_bottom_width(group->style,
&b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
a_src = b_src;
}
/* The table itself -- consider its bottom border */
b.style = css_computed_border_bottom_style(table->style);
b.color = css_computed_border_bottom_color(table->style, &b.c);
css_computed_border_bottom_width(table->style,
&b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, table->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE;
if (table_border_is_more_eyecatching(&a, a_src, &b, b_src)) {
a = b;
}
}
/* a now contains the used bottom border for the cell */
cell->border[BOTTOM].style = a.style;
cell->border[BOTTOM].c = a.c;
cell->border[BOTTOM].width =
FIXTOINT(nscss_len2px(a.width, a.unit, cell->style));
}
/**
* Determine if a border style is more eyecatching than another
*
* \param a Reference border style
* \param a_src Source of \a a
* \param b Candidate border style
* \param b_src Source of \a b
* \return True if \a b is more eyecatching than \a a
*/
bool table_border_is_more_eyecatching(const struct border *a,
box_type a_src, const struct border *b, box_type b_src)
{
css_fixed awidth, bwidth;
int impact = 0;
/* See CSS 2.1 $17.6.2.1 */
/* 1 + 2 -- hidden beats everything, none beats nothing */
if (a->style == CSS_BORDER_STYLE_HIDDEN ||
b->style == CSS_BORDER_STYLE_NONE)
return false;
if (b->style == CSS_BORDER_STYLE_HIDDEN ||
a->style == CSS_BORDER_STYLE_NONE)
return true;
/* 3a -- wider borders beat narrow ones */
/* The widths must be absolute, which will be the case
* if they've come from a computed style. */
assert(a->unit != CSS_UNIT_EM && a->unit != CSS_UNIT_EX);
assert(b->unit != CSS_UNIT_EM && b->unit != CSS_UNIT_EX);
awidth = nscss_len2px(a->width, a->unit, NULL);
bwidth = nscss_len2px(b->width, b->unit, NULL);
if (awidth < bwidth)
return true;
else if (bwidth < awidth)
return false;
/* 3b -- sort by style */
switch (a->style) {
case CSS_BORDER_STYLE_DOUBLE: impact++;
case CSS_BORDER_STYLE_SOLID: impact++;
case CSS_BORDER_STYLE_DASHED: impact++;
case CSS_BORDER_STYLE_DOTTED: impact++;
case CSS_BORDER_STYLE_RIDGE: impact++;
case CSS_BORDER_STYLE_OUTSET: impact++;
case CSS_BORDER_STYLE_GROOVE: impact++;
case CSS_BORDER_STYLE_INSET: impact++;
default:
break;
}
switch (b->style) {
case CSS_BORDER_STYLE_DOUBLE: impact--;
case CSS_BORDER_STYLE_SOLID: impact--;
case CSS_BORDER_STYLE_DASHED: impact--;
case CSS_BORDER_STYLE_DOTTED: impact--;
case CSS_BORDER_STYLE_RIDGE: impact--;
case CSS_BORDER_STYLE_OUTSET: impact--;
case CSS_BORDER_STYLE_GROOVE: impact--;
case CSS_BORDER_STYLE_INSET: impact--;
default:
break;
}
if (impact < 0)
return true;
else if (impact > 0)
return false;
/* 4a -- sort by origin */
impact = 0;
switch (a_src) {
case BOX_TABLE_CELL: impact++;
case BOX_TABLE_ROW: impact++;
case BOX_TABLE_ROW_GROUP: impact++;
/** \todo COL/COL_GROUP */
case BOX_TABLE: impact++;
default:
break;
}
switch (b_src) {
case BOX_TABLE_CELL: impact--;
case BOX_TABLE_ROW: impact--;
case BOX_TABLE_ROW_GROUP: impact--;
/** \todo COL/COL_GROUP */
case BOX_TABLE: impact--;
default:
break;
}
if (impact < 0)
return true;
else if (impact > 0)
return false;
/* 4b -- furthest left (if direction: ltr) and towards top wins */
/** \todo Currently assumes b satisifies this */
return true;
}
/******************************************************************************
* Helpers for top border collapsing *
******************************************************************************/
/**
* Process a table
*
* \param table Table to process
* \param a Current border style for cell
* \param a_src Source of \a a
*
* \post \a a will be updated with most eyecatching style
* \post \a a_src will be updated also
*/
void table_cell_top_process_table(struct box *table, struct border *a,
box_type *a_src)
{
struct border b;
box_type b_src;
/* Top border of table */
b.style = css_computed_border_top_style(table->style);
b.color = css_computed_border_top_color(table->style, &b.c);
css_computed_border_top_width(table->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, table->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE;
if (table_border_is_more_eyecatching(a, *a_src, &b, b_src)) {
*a = b;
*a_src = b_src;
}
}
/**
* Process a group
*
* \param cell Cell being considered
* \param group Group to process
* \param a Current border style for cell
* \param a_src Source of \a a
* \return true if group has non-empty rows, false otherwise
*
* \post \a a will be updated with most eyecatching style
* \post \a a_src will be updated also
*/
bool table_cell_top_process_group(struct box *cell, struct box *group,
struct border *a, box_type *a_src)
{
struct border b;
box_type b_src;
/* Bottom border of group */
b.style = css_computed_border_bottom_style(group->style);
b.color = css_computed_border_bottom_color(group->style, &b.c);
css_computed_border_bottom_width(group->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(a, *a_src, &b, b_src)) {
*a = b;
*a_src = b_src;
}
if (group->last != NULL) {
/* Process rows in group, starting with last */
struct box *row = group->last;
while (table_cell_top_process_row(cell, row,
a, a_src) == false) {
if (row->prev == NULL) {
return false;
} else {
row = row->prev;
}
}
} else {
/* Group is empty, so consider its top border */
b.style = css_computed_border_top_style(group->style);
b.color = css_computed_border_top_color(group->style, &b.c);
css_computed_border_top_width(group->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, group->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW_GROUP;
if (table_border_is_more_eyecatching(a, *a_src, &b, b_src)) {
*a = b;
*a_src = b_src;
}
return false;
}
return true;
}
/**
* Process a row
*
* \param cell Cell being considered
* \param row Row to process
* \param a Current border style for cell
* \param a_src Source of \a a
* \return true if row has cells, false otherwise
*
* \post \a a will be updated with most eyecatching style
* \post \a a_src will be updated also
*/
bool table_cell_top_process_row(struct box *cell, struct box *row,
struct border *a, box_type *a_src)
{
struct border b;
box_type b_src;
/* Bottom border of row */
b.style = css_computed_border_bottom_style(row->style);
b.color = css_computed_border_bottom_color(row->style, &b.c);
css_computed_border_bottom_width(row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(a, *a_src, &b, b_src)) {
*a = b;
*a_src = b_src;
}
if (row->children == NULL) {
/* Row is empty, so consider its top border */
b.style = css_computed_border_top_style(row->style);
b.color = css_computed_border_top_color(row->style, &b.c);
css_computed_border_top_width(row->style, &b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit, row->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_ROW;
if (table_border_is_more_eyecatching(a, *a_src, &b, b_src)) {
*a = b;
*a_src = b_src;
}
return false;
} else {
/* Process cells that are directly above the cell being
* considered. They may not be in this row, but in one of the
* rows above it in the case where rowspan > 1. */
struct box *c;
bool processed = false;
while (processed == false) {
for (c = row->children; c != NULL; c = c->next) {
/* Ignore cells to the left */
if (c->start_column + c->columns - 1 <
cell->start_column)
continue;
/* Ignore cells to the right */
if (c->start_column > cell->start_column +
cell->columns - 1)
continue;
/* Flag that we've processed a cell */
processed = true;
/* Consider bottom border */
b.style = css_computed_border_bottom_style(
c->style);
b.color = css_computed_border_bottom_color(
c->style, &b.c);
css_computed_border_bottom_width(c->style,
&b.width, &b.unit);
b.width = nscss_len2px(b.width, b.unit,
c->style);
b.unit = CSS_UNIT_PX;
b_src = BOX_TABLE_CELL;
if (table_border_is_more_eyecatching(a, *a_src,
&b, b_src)) {
*a = b;
*a_src = b_src;
}
}
if (processed == false) {
/* There must be a preceding row */
assert(row->prev != NULL);
row = row->prev;
}
}
}
return true;
}
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