void SkScalerContext::getMetrics(SkGlyph* glyph) {
generateMetrics(glyph);
// for now we have separate cache entries for devkerning on and off
// in the future we might share caches, but make our measure/draw
// code make the distinction. Thus we zap the values if the caller
// has not asked for them.
if ((fRec.fFlags & SkScalerContext::kDevKernText_Flag) == 0) {
// no devkern, so zap the fields
glyph->fLsbDelta = glyph->fRsbDelta = 0;
}
// if either dimension is empty, zap the image bounds of the glyph
if (0 == glyph->fWidth || 0 == glyph->fHeight) {
glyph->fWidth = 0;
glyph->fHeight = 0;
glyph->fTop = 0;
glyph->fLeft = 0;
glyph->fMaskFormat = 0;
return;
}
if (fGenerateImageFromPath) {
SkPath devPath, fillPath;
SkMatrix fillToDevMatrix;
this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix);
if (fRasterizer) {
SkMask mask;
if (fRasterizer->rasterize(fillPath, fillToDevMatrix, nullptr,
fMaskFilter, &mask,
SkMask::kJustComputeBounds_CreateMode)) {
glyph->fLeft = mask.fBounds.fLeft;
glyph->fTop = mask.fBounds.fTop;
glyph->fWidth = SkToU16(mask.fBounds.width());
glyph->fHeight = SkToU16(mask.fBounds.height());
} else {
goto SK_ERROR;
}
} else {
// just use devPath
const SkIRect ir = devPath.getBounds().roundOut();
if (ir.isEmpty() || !ir.is16Bit()) {
goto SK_ERROR;
}
glyph->fLeft = ir.fLeft;
glyph->fTop = ir.fTop;
glyph->fWidth = SkToU16(ir.width());
glyph->fHeight = SkToU16(ir.height());
if (glyph->fWidth > 0) {
switch (fRec.fMaskFormat) {
case SkMask::kLCD16_Format:
glyph->fWidth += 2;
glyph->fLeft -= 1;
break;
default:
break;
}
}
}
}
if (SkMask::kARGB32_Format != glyph->fMaskFormat) {
glyph->fMaskFormat = fRec.fMaskFormat;
}
// If we are going to create the mask, then we cannot keep the color
if ((fGenerateImageFromPath || fMaskFilter) &&
SkMask::kARGB32_Format == glyph->fMaskFormat) {
glyph->fMaskFormat = SkMask::kA8_Format;
}
if (fMaskFilter) {
SkMask src, dst;
SkMatrix matrix;
glyph->toMask(&src);
fRec.getMatrixFrom2x2(&matrix);
src.fImage = nullptr; // only want the bounds from the filter
if (fMaskFilter->filterMask(&dst, src, matrix, nullptr)) {
if (dst.fBounds.isEmpty() || !dst.fBounds.is16Bit()) {
goto SK_ERROR;
}
SkASSERT(dst.fImage == nullptr);
glyph->fLeft = dst.fBounds.fLeft;
glyph->fTop = dst.fBounds.fTop;
glyph->fWidth = SkToU16(dst.fBounds.width());
glyph->fHeight = SkToU16(dst.fBounds.height());
glyph->fMaskFormat = dst.fFormat;
}
}
return;
SK_ERROR:
// draw nothing 'cause we failed
glyph->fLeft = 0;
glyph->fTop = 0;
glyph->fWidth = 0;
glyph->fHeight = 0;
// put a valid value here, in case it was earlier set to
// MASK_FORMAT_JUST_ADVANCE
glyph->fMaskFormat = fRec.fMaskFormat;
}
void SkScalerContext_CairoFT::generateAdvance(SkGlyph* glyph)
{
generateMetrics(glyph);
}