bool FontPlatformData::fontContainsCharacter(UChar32 character) {
SkPaint paint;
setupPaint(&paint);
paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
uint16_t glyph;
paint.textToGlyphs(&character, sizeof(character), &glyph);
return glyph;
}
bool SkDrawPaint::getProperty(int index, SkScriptValue* value) const {
SkPaint::FontMetrics metrics;
SkPaint paint;
setupPaint(&paint);
paint.getFontMetrics(&metrics);
switch (index) {
case SK_PROPERTY(ascent):
value->fOperand.fScalar = metrics.fAscent;
break;
case SK_PROPERTY(descent):
value->fOperand.fScalar = metrics.fDescent;
break;
// should consider returning fLeading as well (or roll it into ascent/descent somehow
default:
SkASSERT(0);
return false;
}
value->fType = SkType_Float;
return true;
}
void SkDrawPaint::executeFunction(SkDisplayable* target, int index,
SkTDArray<SkScriptValue>& parameters, SkDisplayTypes type,
SkScriptValue* scriptValue) {
if (scriptValue == NULL)
return;
SkASSERT(target == this);
switch (index) {
case SK_FUNCTION(measureText): {
SkASSERT(parameters.count() == 1);
SkASSERT(type == SkType_Float);
SkPaint paint;
setupPaint(&paint);
scriptValue->fType = SkType_Float;
SkASSERT(parameters[0].fType == SkType_String);
scriptValue->fOperand.fScalar = paint.measureText(parameters[0].fOperand.fString->c_str(),
parameters[0].fOperand.fString->size());
// SkDebugf("measureText: %s = %g\n", parameters[0].fOperand.fString->c_str(),
// scriptValue->fOperand.fScalar / 65536.0f);
} break;
default:
SkASSERT(0);
}
}
bool SkDrawPaint::draw(SkAnimateMaker& maker) {
SkPaint* paint = maker.fPaint;
setupPaint(paint);
return false;
}
// 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() || PlatformSupport::layoutTestMode())
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);
}
SkCanvas* canvas = gc->platformContext()->canvas();
if (font->platformData().orientation() == Vertical) {
canvas->save();
canvas->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);
canvas->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);
}
canvas->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, paint);
}
if (font->platformData().orientation() == Vertical)
canvas->restore();
}
