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/*
* Copyright (C) 2006, 2007, 2008, 2009 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. AND ITS CONTRIBUTORS ``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 ITS 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 "Font.h"
#include "ComplexTextController.h"
#include "FontGlyphs.h"
#include "GlyphBuffer.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include "SimpleFontData.h"
#include "TextRun.h"
#include <wtf/MathExtras.h>
using namespace std;
namespace WebCore {
FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h,
int from, int to) const
{
ComplexTextController controller(this, run);
controller.advance(from);
float beforeWidth = controller.runWidthSoFar();
controller.advance(to);
float afterWidth = controller.runWidthSoFar();
// Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
if (run.rtl()) {
float totalWidth = controller.totalWidth();
return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h);
}
return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h);
}
float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
float initialAdvance;
ComplexTextController controller(this, run, false, 0, forTextEmphasis);
controller.advance(from);
float beforeWidth = controller.runWidthSoFar();
controller.advance(to, &glyphBuffer);
if (glyphBuffer.isEmpty())
return 0;
float afterWidth = controller.runWidthSoFar();
if (run.rtl()) {
initialAdvance = controller.totalWidth() + controller.finalRoundingWidth() - afterWidth;
glyphBuffer.reverse(0, glyphBuffer.size());
} else
initialAdvance = beforeWidth;
return initialAdvance;
}
void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
// This glyph buffer holds our glyphs + advances + font data for each glyph.
GlyphBuffer glyphBuffer;
float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer);
// We couldn't generate any glyphs for the run. Give up.
if (glyphBuffer.isEmpty())
return;
// Draw the glyph buffer now at the starting point returned in startX.
FloatPoint startPoint(startX, point.y());
drawGlyphBuffer(context, run, glyphBuffer, startPoint);
}
void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const
{
GlyphBuffer glyphBuffer;
float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer, ForTextEmphasis);
if (glyphBuffer.isEmpty())
return;
drawEmphasisMarks(context, run, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
ComplexTextController controller(this, run, true, fallbackFonts);
if (glyphOverflow) {
glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()));
glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent()));
glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX()));
glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.totalWidth()));
}
return controller.totalWidth();
}
int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const
{
ComplexTextController controller(this, run);
return controller.offsetForPosition(x, includePartialGlyphs);
}
const SimpleFontData* Font::fontDataForCombiningCharacterSequence(const UChar* characters, size_t length, FontDataVariant variant) const
{
UChar32 baseCharacter;
size_t baseCharacterLength = 0;
U16_NEXT(characters, baseCharacterLength, length, baseCharacter);
GlyphData baseCharacterGlyphData = glyphDataForCharacter(baseCharacter, false, variant);
if (!baseCharacterGlyphData.glyph)
return 0;
if (length == baseCharacterLength)
return baseCharacterGlyphData.fontData;
bool triedBaseCharacterFontData = false;
unsigned i = 0;
for (const FontData* fontData = fontDataAt(0); fontData; fontData = fontDataAt(++i)) {
const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(baseCharacter);
if (variant == NormalVariant) {
if (simpleFontData->platformData().orientation() == Vertical) {
if (isCJKIdeographOrSymbol(baseCharacter) && !simpleFontData->hasVerticalGlyphs()) {
variant = BrokenIdeographVariant;
simpleFontData = simpleFontData->brokenIdeographFontData().get();
} else if (m_fontDescription.nonCJKGlyphOrientation() == NonCJKGlyphOrientationVerticalRight) {
SimpleFontData* verticalRightFontData = simpleFontData->verticalRightOrientationFontData().get();
Glyph verticalRightGlyph = verticalRightFontData->glyphForCharacter(baseCharacter);
if (verticalRightGlyph == baseCharacterGlyphData.glyph)
simpleFontData = verticalRightFontData;
} else {
SimpleFontData* uprightFontData = simpleFontData->uprightOrientationFontData().get();
Glyph uprightGlyph = uprightFontData->glyphForCharacter(baseCharacter);
if (uprightGlyph != baseCharacterGlyphData.glyph)
simpleFontData = uprightFontData;
}
}
} else {
if (const SimpleFontData* variantFontData = simpleFontData->variantFontData(m_fontDescription, variant).get())
simpleFontData = variantFontData;
}
if (simpleFontData == baseCharacterGlyphData.fontData)
triedBaseCharacterFontData = true;
if (simpleFontData->canRenderCombiningCharacterSequence(characters, length))
return simpleFontData;
}
if (!triedBaseCharacterFontData && baseCharacterGlyphData.fontData && baseCharacterGlyphData.fontData->canRenderCombiningCharacterSequence(characters, length))
return baseCharacterGlyphData.fontData;
return SimpleFontData::systemFallback();
}
} // namespace WebCore
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