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/*
* Copyright (c) 2007, 2008, 2010 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 "platform/fonts/Font.h"
#include "platform/NotImplemented.h"
#include "platform/fonts/FontPlatformFeatures.h"
#include "platform/fonts/SimpleFontData.h"
#include "platform/fonts/harfbuzz/HarfBuzzShaper.h"
#include "platform/fonts/GlyphBuffer.h"
#include "platform/geometry/FloatRect.h"
#include "platform/graphics/GraphicsContext.h"
#include "SkPaint.h"
#include "SkTemplates.h"
#include "wtf/unicode/Unicode.h"
namespace WebCore {
bool FontPlatformFeatures::canReturnFallbackFontsForComplexText()
{
return false;
}
bool FontPlatformFeatures::canExpandAroundIdeographsInComplexText()
{
return false;
}
static void paintGlyphs(GraphicsContext* gc, const SimpleFontData* font,
const Glyph* glyphs, unsigned numGlyphs,
SkPoint* pos, const FloatRect& textRect)
{
TextDrawingModeFlags textMode = gc->textDrawingMode();
// We draw text up to two times (once for fill, once for stroke).
if (textMode & TextModeFill) {
SkPaint paint = gc->fillPaint();
font->platformData().setupPaint(&paint, gc);
gc->adjustTextRenderMode(&paint);
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint);
}
if ((textMode & TextModeStroke)
&& gc->strokeStyle() != NoStroke
&& gc->strokeThickness() > 0) {
SkPaint paint = gc->strokePaint();
font->platformData().setupPaint(&paint, gc);
gc->adjustTextRenderMode(&paint);
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
if (textMode & TextModeFill) {
// If there is a shadow and we filled above, there will already be
// a shadow. We don't want to draw it again or it will be too dark
// and it will go on top of the fill.
//
// Note that this isn't strictly correct, since the stroke could be
// very thick and the shadow wouldn't account for this. The "right"
// thing would be to draw to a new layer and then draw that layer
// with a shadow. But this is a lot of extra work for something
// that isn't normally an issue.
paint.setLooper(0);
}
gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint);
}
}
void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs,
const FloatPoint& point, const FloatRect& textRect) const
{
SkScalar x = SkFloatToScalar(point.x());
SkScalar y = SkFloatToScalar(point.y());
SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
SkPoint* pos = storage.get();
const OpenTypeVerticalData* verticalData = font->verticalData();
if (font->platformData().orientation() == Vertical && verticalData) {
AffineTransform savedMatrix = gc->getCTM();
gc->concatCTM(AffineTransform(0, -1, 1, 0, point.x(), point.y()));
gc->concatCTM(AffineTransform(1, 0, 0, 1, -point.x(), -point.y()));
const unsigned kMaxBufferLength = 256;
Vector<FloatPoint, kMaxBufferLength> translations;
const FontMetrics& metrics = font->fontMetrics();
SkScalar verticalOriginX = SkFloatToScalar(point.x() + metrics.floatAscent() - metrics.floatAscent(IdeographicBaseline));
float horizontalOffset = point.x();
unsigned glyphIndex = 0;
while (glyphIndex < numGlyphs) {
unsigned chunkLength = std::min(kMaxBufferLength, numGlyphs - glyphIndex);
const Glyph* glyphs = glyphBuffer.glyphs(from + glyphIndex);
translations.resize(chunkLength);
verticalData->getVerticalTranslationsForGlyphs(font, &glyphs[0], chunkLength, reinterpret_cast<float*>(&translations[0]));
x = verticalOriginX;
y = SkFloatToScalar(point.y() + horizontalOffset - point.x());
float currentWidth = 0;
for (unsigned i = 0; i < chunkLength; ++i, ++glyphIndex) {
pos[i].set(
x + SkIntToScalar(lroundf(translations[i].x())),
y + -SkIntToScalar(-lroundf(currentWidth - translations[i].y())));
currentWidth += glyphBuffer.advanceAt(from + glyphIndex).width();
}
horizontalOffset += currentWidth;
paintGlyphs(gc, font, glyphs, chunkLength, pos, textRect);
}
gc->setCTM(savedMatrix);
return;
}
// FIXME: text rendering speed:
// Android has code in their WebCore fork to special case when the
// GlyphBuffer has no advances other than the defaults. In that case the
// text drawing can proceed faster. However, it's unclear when those
// patches may be upstreamed to WebKit so we always use the slower path
// here.
const FloatSize* adv = glyphBuffer.advances(from);
for (unsigned i = 0; i < numGlyphs; i++) {
pos[i].set(x, y);
x += SkFloatToScalar(adv[i].width());
y += SkFloatToScalar(adv[i].height());
}
const Glyph* glyphs = glyphBuffer.glyphs(from);
paintGlyphs(gc, font, glyphs, numGlyphs, pos, textRect);
}
void Font::drawComplexText(GraphicsContext* gc, const TextRunPaintInfo& runInfo, const FloatPoint& point) const
{
if (!runInfo.run.length())
return;
TextDrawingModeFlags textMode = gc->textDrawingMode();
bool fill = textMode & TextModeFill;
bool stroke = (textMode & TextModeStroke)
&& gc->strokeStyle() != NoStroke
&& gc->strokeThickness() > 0;
if (!fill && !stroke)
return;
GlyphBuffer glyphBuffer;
HarfBuzzShaper shaper(this, runInfo.run);
shaper.setDrawRange(runInfo.from, runInfo.to);
if (!shaper.shape(&glyphBuffer) || glyphBuffer.isEmpty())
return;
FloatPoint adjustedPoint = shaper.adjustStartPoint(point);
drawGlyphBuffer(gc, runInfo, glyphBuffer, adjustedPoint);
}
void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const
{
GlyphBuffer glyphBuffer;
float initialAdvance = getGlyphsAndAdvancesForComplexText(runInfo, glyphBuffer, ForTextEmphasis);
if (glyphBuffer.isEmpty())
return;
drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y()));
}
float Font::getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo& runInfo, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
HarfBuzzShaper shaper(this, runInfo.run, HarfBuzzShaper::ForTextEmphasis);
shaper.setDrawRange(runInfo.from, runInfo.to);
shaper.shape(&glyphBuffer);
return 0;
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* /* fallbackFonts */, IntRectExtent* glyphBounds) const
{
HarfBuzzShaper shaper(this, run);
if (!shaper.shape())
return 0;
glyphBounds->setTop(floorf(-shaper.glyphBoundingBox().top()));
glyphBounds->setBottom(ceilf(shaper.glyphBoundingBox().bottom()));
glyphBounds->setLeft(std::max<int>(0, floorf(-shaper.glyphBoundingBox().left())));
glyphBounds->setRight(std::max<int>(0, ceilf(shaper.glyphBoundingBox().right() - shaper.totalWidth())));
return shaper.totalWidth();
}
// Return the code point index for the given |x| offset into the text run.
int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat,
bool includePartialGlyphs) const
{
HarfBuzzShaper shaper(this, run);
if (!shaper.shape())
return 0;
return shaper.offsetForPosition(xFloat);
}
// Return the rectangle for selecting the given range of code-points in the TextRun.
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const FloatPoint& point, int height,
int from, int to) const
{
HarfBuzzShaper shaper(this, run);
if (!shaper.shape())
return FloatRect();
return shaper.selectionRect(point, height, from, to);
}
} // namespace WebCore
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