bool windowsCanHandleTextDrawing(GraphicsContext* context)
{
// Check for non-translation transforms. Sometimes zooms will look better in
// Skia, and sometimes better in Windows. The main problem is that zooming
// in using Skia will show you the hinted outlines for the smaller size,
// which look weird. All else being equal, it's better to use Windows' text
// drawing, so we don't check for zooms.
const AffineTransform& matrix = context->getCTM();
if (matrix.b() != 0 || matrix.c() != 0) // Check for skew.
return false;
// Check for stroke effects.
if (context->platformContext()->getTextDrawingMode() != cTextFill)
return false;
// Check for gradients.
if (context->fillGradient() || context->strokeGradient())
return false;
// Check for patterns.
if (context->fillPattern() || context->strokePattern())
return false;
// Check for shadow effects.
if (context->platformContext()->getDrawLooper() && (!windowsCanHandleDrawTextShadow(context)))
return false;
return true;
}
void Font::drawGlyphs(GraphicsContext* graphicsContext,
const SimpleFontData* font,
const GlyphBuffer& glyphBuffer,
int from,
int numGlyphs,
const FloatPoint& point) const
{
SkColor color = graphicsContext->platformContext()->effectiveFillColor();
unsigned char alpha = SkColorGetA(color);
// Skip 100% transparent text; no need to draw anything.
if (!alpha && graphicsContext->platformContext()->getStrokeStyle() == NoStroke && !graphicsContext->hasShadow())
return;
if (!alpha || windowsCanHandleDrawTextShadow(graphicsContext) || !windowsCanHandleTextDrawingWithoutShadow(graphicsContext)) {
drawGlyphsWin(graphicsContext, font, glyphBuffer, from, numGlyphs, point);
return;
}
// Draw in two passes: skia for the shadow, GDI for foreground text
// pass1: shadow (will use skia)
graphicsContext->save();
graphicsContext->setFillColor(Color::transparent, graphicsContext->fillColorSpace());
drawGlyphsWin(graphicsContext, font, glyphBuffer, from, numGlyphs, point);
graphicsContext->restore();
// pass2: foreground text (will use GDI)
FloatSize shadowOffset;
float shadowBlur;
Color shadowColor;
ColorSpace shadowColorSpace;
graphicsContext->getShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace);
graphicsContext->setShadow(shadowOffset, shadowBlur, Color::transparent, shadowColorSpace);
drawGlyphsWin(graphicsContext, font, glyphBuffer, from, numGlyphs, point);
graphicsContext->setShadow(shadowOffset, shadowBlur, shadowColor, shadowColorSpace);
}
bool windowsCanHandleTextDrawing(GraphicsContext* context)
{
if (!windowsCanHandleTextDrawingWithoutShadow(context))
return false;
// Check for shadow effects.
if (!windowsCanHandleDrawTextShadow(context))
return false;
return true;
}
void Font::drawComplexText(GraphicsContext* graphicsContext,
const TextRun& run,
const FloatPoint& point,
int from,
int to) const
{
PlatformGraphicsContext* context = graphicsContext->platformContext();
UniscribeHelperTextRun state(run, *this);
SkColor color = graphicsContext->platformContext()->effectiveFillColor();
unsigned char alpha = SkColorGetA(color);
// Skip 100% transparent text; no need to draw anything.
if (!alpha && graphicsContext->platformContext()->getStrokeStyle() == NoStroke)
return;
TransparencyAwareUniscribePainter painter(graphicsContext, this, run, from, to, point);
HDC hdc = painter.hdc();
if (windowsCanHandleTextDrawing(graphicsContext) && !hdc)
return;
// TODO(maruel): http://b/700464 SetTextColor doesn't support transparency.
// Enforce non-transparent color.
color = SkColorSetRGB(SkColorGetR(color), SkColorGetG(color), SkColorGetB(color));
if (hdc) {
SetTextColor(hdc, skia::SkColorToCOLORREF(color));
SetBkMode(hdc, TRANSPARENT);
}
// If there is a non-blur shadow and both the fill color and shadow color
// are opaque, handle without skia.
IntSize shadowSize;
int shadowBlur;
Color shadowColor;
if (graphicsContext->getShadow(shadowSize, shadowBlur, shadowColor) && windowsCanHandleDrawTextShadow(graphicsContext)) {
COLORREF textColor = skia::SkColorToCOLORREF(SkColorSetARGB(255, shadowColor.red(), shadowColor.green(), shadowColor.blue()));
COLORREF savedTextColor = GetTextColor(hdc);
SetTextColor(hdc, textColor);
state.draw(graphicsContext, hdc, static_cast<int>(point.x()) + shadowSize.width(),
static_cast<int>(point.y() - ascent()) + shadowSize.height(), from, to);
SetTextColor(hdc, savedTextColor);
}
// Uniscribe counts the coordinates from the upper left, while WebKit uses
// the baseline, so we have to subtract off the ascent.
state.draw(graphicsContext, hdc, static_cast<int>(point.x()),
static_cast<int>(point.y() - ascent()), from, to);
context->canvas()->endPlatformPaint();
}
