static int computePaintTextFlags(const LOGFONT& lf)
{
int textFlags = 0;
switch (lf.lfQuality) {
case NONANTIALIASED_QUALITY:
textFlags = 0;
break;
case ANTIALIASED_QUALITY:
textFlags = SkPaint::kAntiAlias_Flag;
break;
case CLEARTYPE_QUALITY:
textFlags = (SkPaint::kAntiAlias_Flag | SkPaint::kLCDRenderText_Flag);
break;
default:
textFlags = getDefaultGDITextFlags();
break;
}
// only allow features that SystemParametersInfo allows
textFlags &= getDefaultGDITextFlags();
/*
* FontPlatformData(...) will read our logfont, and try to honor the the lfQuality
* setting (computing the corresponding SkPaint flags for AA and LCD). However, it
* will limit the quality based on its query of SPI_GETFONTSMOOTHING. This could mean
* we end up drawing the text in BW, even though our lfQuality requested antialiasing.
*
* Many web-fonts are so poorly hinted that they are terrible to read when drawn in BW.
* In these cases, we have decided to FORCE these fonts to be drawn with at least grayscale AA,
* even when the System (getDefaultGDITextFlags) tells us to draw only in BW.
*/
if (isWebFont(lf) && !isRunningLayoutTest())
textFlags |= SkPaint::kAntiAlias_Flag;
return textFlags;
}
static int computePaintTextFlags(String fontFamilyName)
{
if (isRunningLayoutTest())
return isFontSmoothingEnabledForTest() ? SkPaint::kAntiAlias_Flag : 0;
int textFlags = getSystemTextFlags();
// Many web-fonts are so poorly hinted that they are terrible to read when drawn in BW.
// In these cases, we have decided to FORCE these fonts to be drawn with at least grayscale AA,
// even when the System (getSystemTextFlags) tells us to draw only in BW.
if (isWebFont(fontFamilyName))
textFlags |= SkPaint::kAntiAlias_Flag;
return textFlags;
}
