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/*
* This code was mostly copied from gdk-pango.
* source: http://git.gnome.org/browse/gtk+/tree/gdk/gdkpango.c
*
* Copyright (C) 2000 Red Hat, Inc.
* Copyright (C) 2011 ProFUSION embedded systems
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "PangoUtilities.h"
#include <cairo.h>
#include <pango/pango.h>
namespace WebCore {
static cairo_region_t* getLineClipRegionFromLayoutIter(PangoLayoutIter* iter, const int* indexRange)
{
PangoRectangle logicalRect;
PangoLayoutLine* line = pango_layout_iter_get_line_readonly(iter);
cairo_region_t* clipRegion = cairo_region_create();
pango_layout_iter_get_line_extents(iter, 0, &logicalRect);
int baseline = pango_layout_iter_get_baseline(iter);
int* pixelRanges = 0;
int pixelRangeCount = 0;
if (indexRange[1] >= line->start_index
&& indexRange[0] < line->start_index + line->length)
pango_layout_line_get_x_ranges(line,
indexRange[0],
indexRange[1],
&pixelRanges, &pixelRangeCount);
for (int j = 0; j < pixelRangeCount; ++j) {
int offsetX = PANGO_PIXELS(pixelRanges[2 * j] - logicalRect.x);
int offsetY = PANGO_PIXELS(baseline - logicalRect.y);
cairo_rectangle_int_t rect;
rect.x = offsetX;
rect.y = -offsetY;
rect.width = PANGO_PIXELS(pixelRanges[2 * j + 1] - logicalRect.x) - offsetX;
rect.height = PANGO_PIXELS(baseline - logicalRect.y + logicalRect.height) - offsetY;
cairo_region_union_rectangle(clipRegion, &rect);
}
free(pixelRanges);
return clipRegion;
}
cairo_region_t* getClipRegionFromPangoLayoutLine(PangoLayoutLine* line, const int* indexRange)
{
if (!indexRange)
return 0;
PangoLayoutIter* iter = pango_layout_get_iter(line->layout);
while (pango_layout_iter_get_line_readonly(iter) != line)
pango_layout_iter_next_line(iter);
cairo_region_t* clipRegion = getLineClipRegionFromLayoutIter(iter, indexRange);
pango_layout_iter_free(iter);
return clipRegion;
}
} // namespace WebCore
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