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/*
* Copyright (c) 2011 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 "Font.h"
#include "FontSmoothingMode.h"
#include "GlyphBuffer.h"
#include "GraphicsContext.h"
#include "LayoutTestSupport.h"
#include "PlatformContextSkia.h"
#include "SimpleFontData.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkTypeface.h"
#include "SkTypeface_mac.h"
namespace WebCore {
bool Font::canReturnFallbackFontsForComplexText()
{
return true;
}
bool Font::canExpandAroundIdeographsInComplexText()
{
return true;
}
static void setupPaint(SkPaint* paint, const SimpleFontData* fontData, const Font* font, bool shouldAntialias, bool shouldSmoothFonts)
{
const FontPlatformData& platformData = fontData->platformData();
const float textSize = platformData.m_size >= 0 ? platformData.m_size : 12;
paint->setAntiAlias(shouldAntialias);
paint->setEmbeddedBitmapText(false);
paint->setTextSize(SkFloatToScalar(textSize));
paint->setVerticalText(platformData.orientation() == Vertical);
SkTypeface* typeface = SkCreateTypefaceFromCTFont(platformData.ctFont());
SkAutoUnref autoUnref(typeface);
paint->setTypeface(typeface);
paint->setFakeBoldText(platformData.m_syntheticBold);
paint->setTextSkewX(platformData.m_syntheticOblique ? -SK_Scalar1 / 4 : 0);
paint->setAutohinted(false); // freetype specific
paint->setLCDRenderText(shouldSmoothFonts);
paint->setSubpixelText(true);
#if OS(DARWIN)
// When using CoreGraphics, disable hinting when webkit-font-smoothing:antialiased is used.
// See crbug.com/152304
if (font->fontDescription().fontSmoothing() == Antialiased)
paint->setHinting(SkPaint::kNo_Hinting);
#endif
if (font->fontDescription().textRenderingMode() == GeometricPrecision)
paint->setHinting(SkPaint::kNo_Hinting);
}
// TODO: This needs to be split into helper functions to better scope the
// inputs/outputs, and reduce duplicate code.
// This issue is tracked in https://bugs.webkit.org/show_bug.cgi?id=62989
void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
const GlyphBuffer& glyphBuffer, int from, int numGlyphs,
const FloatPoint& point) const {
COMPILE_ASSERT(sizeof(GlyphBufferGlyph) == sizeof(uint16_t), GlyphBufferGlyphSize_equals_uint16_t);
bool shouldSmoothFonts = true;
bool shouldAntialias = true;
switch (fontDescription().fontSmoothing()) {
case Antialiased:
shouldSmoothFonts = false;
break;
case SubpixelAntialiased:
break;
case NoSmoothing:
shouldAntialias = false;
shouldSmoothFonts = false;
break;
case AutoSmoothing:
// For the AutoSmooth case, don't do anything! Keep the default settings.
break;
}
if (!shouldUseSmoothing() || isRunningLayoutTest())
shouldSmoothFonts = false;
const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from);
SkScalar x = SkFloatToScalar(point.x());
SkScalar y = SkFloatToScalar(point.y());
if (font->platformData().orientation() == Vertical)
y += SkFloatToScalar(font->fontMetrics().floatAscent(IdeographicBaseline) - font->fontMetrics().floatAscent());
// 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 GlyphBufferAdvance* adv = glyphBuffer.advances(from);
SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
SkPoint* pos = storage.get();
for (int i = 0; i < numGlyphs; i++) {
pos[i].set(x, y);
x += SkFloatToScalar(adv[i].width());
y += SkFloatToScalar(adv[i].height());
}
PlatformContextSkia* platformContext = gc->platformContext();
if (font->platformData().orientation() == Vertical) {
platformContext->save();
platformContext->rotate(-90);
SkMatrix rotator;
rotator.reset();
rotator.setRotate(90);
rotator.mapPoints(pos, numGlyphs);
}
TextDrawingModeFlags textMode = gc->platformContext()->getTextDrawingMode();
// We draw text up to two times (once for fill, once for stroke).
if (textMode & TextModeFill) {
SkPaint paint;
gc->platformContext()->setupPaintForFilling(&paint);
setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts);
gc->platformContext()->adjustTextRenderMode(&paint);
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
platformContext->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, paint);
}
if ((textMode & TextModeStroke)
&& gc->platformContext()->getStrokeStyle() != NoStroke
&& gc->platformContext()->getStrokeThickness() > 0) {
SkPaint paint;
gc->platformContext()->setupPaintForStroking(&paint, 0, 0);
setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts);
gc->platformContext()->adjustTextRenderMode(&paint);
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
if (textMode & TextModeFill) {
// If we also filled, we don't want to draw shadows twice.
// See comment in FontChromiumWin.cpp::paintSkiaText() for more details.
paint.setLooper(0);
}
platformContext->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, paint);
}
if (font->platformData().orientation() == Vertical)
platformContext->restore();
}
} // namespace WebCore
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