std::unique_ptr<GrAtlasTextOp> GrAtlasTextOp::MakeDistanceField(
GrContext* context,
GrPaint&& paint,
int glyphCount,
const GrDistanceFieldAdjustTable* distanceAdjustTable,
bool useGammaCorrectDistanceTable,
SkColor luminanceColor,
const SkSurfaceProps& props,
bool isAntiAliased,
bool useLCD) {
GrOpMemoryPool* pool = context->contextPriv().opMemoryPool();
std::unique_ptr<GrAtlasTextOp> op = pool->allocate<GrAtlasTextOp>(std::move(paint));
bool isBGR = SkPixelGeometryIsBGR(props.pixelGeometry());
bool isLCD = useLCD && SkPixelGeometryIsH(props.pixelGeometry());
op->fMaskType = !isAntiAliased ? kAliasedDistanceField_MaskType
: isLCD ? (isBGR ? kLCDBGRDistanceField_MaskType
: kLCDDistanceField_MaskType)
: kGrayscaleDistanceField_MaskType;
op->fDistanceAdjustTable.reset(SkRef(distanceAdjustTable));
op->fUseGammaCorrectDistanceTable = useGammaCorrectDistanceTable;
op->fLuminanceColor = luminanceColor;
op->fNumGlyphs = glyphCount;
op->fGeoCount = 1;
return op;
}
void SkWindow::setColorType(SkColorType ct, SkColorProfileType pt) {
const SkImageInfo& info = fBitmap.info();
this->resize(SkImageInfo::Make(info.width(), info.height(), ct, kPremul_SkAlphaType, pt));
// Set the global flag that enables or disables "legacy" mode, depending on our format.
// With sRGB 32-bit or linear FP 16, we turn on gamma-correct handling of inputs:
SkSurfaceProps props = this->getSurfaceProps();
uint32_t flags = (props.flags() & ~SkSurfaceProps::kAllowSRGBInputs_Flag) |
(SkColorAndProfileAreGammaCorrect(ct, pt) ? SkSurfaceProps::kAllowSRGBInputs_Flag : 0);
this->setSurfaceProps(SkSurfaceProps(flags, props.pixelGeometry()));
}
uint32_t GrTextUtils::FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint) {
uint32_t flags = paint.getFlags();
if (!paint.isLCDRenderText() || !paint.isAntiAlias()) {
return flags;
}
if (kUnknown_SkPixelGeometry == surfaceProps.pixelGeometry() || ShouldDisableLCD(paint)) {
flags &= ~SkPaint::kLCDRenderText_Flag;
flags |= SkPaint::kGenA8FromLCD_Flag;
}
return flags;
}
bool GrTextUtils::CanDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix,
const SkSurfaceProps& props, const GrShaderCaps& caps) {
// TODO: support perspective (need getMaxScale replacement)
if (viewMatrix.hasPerspective()) {
return false;
}
SkScalar maxScale = viewMatrix.getMaxScale();
SkScalar scaledTextSize = maxScale*skPaint.getTextSize();
// Hinted text looks far better at small resolutions
// Scaling up beyond 2x yields undesireable artifacts
if (scaledTextSize < kMinDFFontSize ||
scaledTextSize > kLargeDFFontLimit) {
return false;
}
bool useDFT = props.isUseDeviceIndependentFonts();
#if SK_FORCE_DISTANCE_FIELD_TEXT
useDFT = true;
#endif
if (!useDFT && scaledTextSize < kLargeDFFontSize) {
return false;
}
// rasterizers and mask filters modify alpha, which doesn't
// translate well to distance
if (skPaint.getRasterizer() || skPaint.getMaskFilter() || !caps.shaderDerivativeSupport()) {
return false;
}
// TODO: add some stroking support
if (skPaint.getStyle() != SkPaint::kFill_Style) {
return false;
}
return true;
}
bool GrTextContext::CanDrawAsDistanceFields(const SkPaint& paint, const SkFont& font,
const SkMatrix& viewMatrix,
const SkSurfaceProps& props,
bool contextSupportsDistanceFieldText,
const Options& options) {
if (!viewMatrix.hasPerspective()) {
SkScalar maxScale = viewMatrix.getMaxScale();
SkScalar scaledTextSize = maxScale * font.getSize();
// Hinted text looks far better at small resolutions
// Scaling up beyond 2x yields undesireable artifacts
if (scaledTextSize < options.fMinDistanceFieldFontSize ||
scaledTextSize > options.fMaxDistanceFieldFontSize) {
return false;
}
bool useDFT = props.isUseDeviceIndependentFonts();
#if SK_FORCE_DISTANCE_FIELD_TEXT
useDFT = true;
#endif
if (!useDFT && scaledTextSize < kLargeDFFontSize) {
return false;
}
}
// mask filters modify alpha, which doesn't translate well to distance
if (paint.getMaskFilter() || !contextSupportsDistanceFieldText) {
return false;
}
// TODO: add some stroking support
if (paint.getStyle() != SkPaint::kFill_Style) {
return false;
}
return true;
}
static bool equal(const SkSurfaceProps& a, const SkSurfaceProps& b) {
return a.flags() == b.flags() && a.pixelGeometry() == b.pixelGeometry();
}
