blob: 2d4f495d4f65afa512061a97768060e3d35e0c61 [file] [log] [blame]
/*
* Copyright (C) 2006-2008, 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FontCascade.h"
#include "Font.h"
#include "GlyphBuffer.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include "LayoutRect.h"
#include "Logging.h"
#include "TextRun.h"
#include "UniscribeController.h"
#include <wtf/MathExtras.h>
namespace WebCore {
bool FontCascade::canReturnFallbackFontsForComplexText()
{
return true;
}
bool FontCascade::canExpandAroundIdeographsInComplexText()
{
return false;
}
void FontCascade::adjustSelectionRectForComplexText(const TextRun& run, LayoutRect& selectionRect, unsigned from, unsigned to) const
{
UniscribeController it(this, run);
it.advance(from);
float beforeWidth = it.runWidthSoFar();
it.advance(to);
float afterWidth = it.runWidthSoFar();
if (run.rtl()) {
it.advance(run.length());
selectionRect.move(it.runWidthSoFar() - afterWidth, 0);
} else
selectionRect.move(beforeWidth, 0);
selectionRect.setWidth(afterWidth - beforeWidth);
}
float FontCascade::getGlyphsAndAdvancesForComplexText(const TextRun& run, unsigned from, unsigned to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
if (forTextEmphasis) {
// FIXME: Add forTextEmphasis paremeter to UniscribeController and use it.
LOG_ERROR("Not implemented for text emphasis.");
return 0;
}
UniscribeController controller(this, run);
controller.advance(from);
float beforeWidth = controller.runWidthSoFar();
controller.advance(to, &glyphBuffer);
if (glyphBuffer.isEmpty())
return 0;
float afterWidth = controller.runWidthSoFar();
if (run.rtl()) {
controller.advance(run.length());
return controller.runWidthSoFar() - afterWidth;
}
return beforeWidth;
}
float FontCascade::floatWidthForComplexText(const TextRun& run, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
UniscribeController controller(this, run, fallbackFonts);
controller.advance(run.length());
if (glyphOverflow) {
glyphOverflow->top = std::max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()));
glyphOverflow->bottom = std::max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent()));
glyphOverflow->left = std::max<int>(0, ceilf(-controller.minGlyphBoundingBoxX()));
glyphOverflow->right = std::max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.runWidthSoFar()));
}
return controller.runWidthSoFar();
}
int FontCascade::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool includePartialGlyphs) const
{
// FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers
// to FontCascade::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem.
int x = static_cast<int>(xFloat);
UniscribeController controller(this, run);
return controller.offsetForPosition(x, includePartialGlyphs);
}
}