AuroraMiddleware/skia2
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Don't use LCD on grayscale devices.

Browse Source 
http://codereview.appspot.com/5281041

M    src/ports/SkFontHost_mac_coretext.cpp



git-svn-id: http://skia.googlecode.com/svn/trunk@2528 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
caryclark@google.com 2011-10-25 19:10:45 +00:00
parent c909a1ecad
commit 0dbb31168d
1 changed files with 31 additions and 2 deletions
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33
src/ports/SkFontHost_mac_coretext.cpp
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@ -1220,6 +1220,30 @@ SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
return nextFontID;
}
static bool supports_LCD() {
static int gSupportsLCD = -1;
if (gSupportsLCD >= 0) {
return (bool) gSupportsLCD;
}
int rgb = 0;
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGContextRef cgContext = CGBitmapContextCreate(&rgb, 1, 1, 8, 4, colorspace,
BITMAP_INFO_RGB);
CGContextSelectFont(cgContext, "Helvetica", 16, kCGEncodingMacRoman);
CGContextSetShouldSmoothFonts(cgContext, true);
CGContextSetShouldAntialias(cgContext, true);
CGContextSetTextDrawingMode(cgContext, kCGTextFill);
CGContextSetGrayFillColor( cgContext, 1, 1.0);
CGContextShowTextAtPoint(cgContext, -1, 0, "|", 1);
CFSafeRelease(colorspace);
CFSafeRelease(cgContext);
int r = (rgb >> 16) & 0xFF;
int g = (rgb >> 8) & 0xFF;
int b = (rgb >> 0) & 0xFF;
gSupportsLCD = r != g || r != b;
return (bool) gSupportsLCD;
}
void SkFontHost::FilterRec(SkScalerContext::Rec* rec) {
unsigned flagsWeDontSupport = SkScalerContext::kDevKernText_Flag |
SkScalerContext::kAutohinting_Flag;
@ -1235,8 +1259,13 @@ void SkFontHost::FilterRec(SkScalerContext::Rec* rec) {
}
rec->setHinting(h);
if (SkMask::kLCD16_Format == rec->fMaskFormat) {
rec->fMaskFormat = SkMask::kLCD32_Format;
if (SkMask::kLCD16_Format == rec->fMaskFormat
|| SkMask::kLCD32_Format == rec->fMaskFormat) {
if (supports_LCD()) {
rec->fMaskFormat = SkMask::kLCD32_Format;
} else {
rec->fMaskFormat = SkMask::kA8_Format;
}
}
}