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set max size for lcdtext

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git-svn-id: http://skia.googlecode.com/svn/trunk@2252 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2011-09-13 13:23:26 +00:00
parent 4c888aae25
commit 4f79b9be9e
1 changed files with 12 additions and 1 deletions
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13
src/core/SkPaint.cpp
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@ -1224,6 +1224,17 @@ static SkPaint::Hinting computeHinting(const SkPaint& paint) {
return h;
}
// Beyond this size, LCD doesn't appreciably improve quality, but it always
// cost more RAM and draws slower, so we set a cap.
static const SkScalar SK_MAX_SIZE_FOR_LCDTEXT = SkIntToScalar(48);
static bool tooBigForLCD(const SkScalerContext::Rec& rec) {
SkScalar area = SkScalarMul(rec.fPost2x2[0][0], rec.fPost2x2[1][1]) -
SkScalarMul(rec.fPost2x2[1][0], rec.fPost2x2[0][1]);
SkScalar size = SkScalarMul(area, rec.fTextSize);
return SkScalarAbs(size) > SK_MAX_SIZE_FOR_LCDTEXT;
}
/*
* Return the scalar with only limited fractional precision. Used to consolidate matrices
* that vary only slightly when we create our key into the font cache, since the font scaler
@ -1308,7 +1319,7 @@ void SkScalerContext::MakeRec(const SkPaint& paint,
{
SkFontHost::LCDOrder order = SkFontHost::GetSubpixelOrder();
SkFontHost::LCDOrientation orient = SkFontHost::GetSubpixelOrientation();
if (SkFontHost::kNONE_LCDOrder == order) {
if (SkFontHost::kNONE_LCDOrder == order || tooBigForLCD(*rec)) {
// eeek, can't support LCD
rec->fMaskFormat = SkMask::kA8_Format;
} else {