| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrPathRendering.h" |
| #include "SkDescriptor.h" |
| #include "SkGlyph.h" |
| #include "SkMatrix.h" |
| #include "SkTypeface.h" |
| #include "GrPathRange.h" |
| |
| class GlyphGenerator : public GrPathRange::PathGenerator { |
| public: |
| GlyphGenerator(const SkTypeface& typeface, const SkDescriptor& desc) |
| : fDesc(desc.copy()), |
| fScalerContext(typeface.createScalerContext(fDesc)) { |
| fFlipMatrix.setScale(1, -1); |
| } |
| |
| virtual ~GlyphGenerator() { |
| SkDescriptor::Free(fDesc); |
| } |
| |
| int getNumPaths() SK_OVERRIDE { |
| return fScalerContext->getGlyphCount(); |
| } |
| |
| void generatePath(int glyphID, SkPath* out) SK_OVERRIDE { |
| SkGlyph skGlyph; |
| skGlyph.init(SkGlyph::MakeID(glyphID)); |
| fScalerContext->getMetrics(&skGlyph); |
| |
| fScalerContext->getPath(skGlyph, out); |
| out->transform(fFlipMatrix); // Load glyphs with the inverted y-direction. |
| } |
| |
| bool isEqualTo(const SkDescriptor& desc) const SK_OVERRIDE { |
| return fDesc->equals(desc); |
| } |
| |
| private: |
| SkDescriptor* const fDesc; |
| const SkAutoTDelete<SkScalerContext> fScalerContext; |
| SkMatrix fFlipMatrix; |
| }; |
| |
| GrPathRange* GrPathRendering::createGlyphs(const SkTypeface* typeface, |
| const SkDescriptor* desc, |
| const SkStrokeRec& stroke) { |
| if (NULL == typeface) { |
| typeface = SkTypeface::GetDefaultTypeface(); |
| SkASSERT(NULL != typeface); |
| } |
| |
| if (desc) { |
| SkAutoTUnref<GlyphGenerator> generator(SkNEW_ARGS(GlyphGenerator, (*typeface, *desc))); |
| return this->createPathRange(generator, stroke); |
| } |
| |
| SkScalerContextRec rec; |
| memset(&rec, 0, sizeof(rec)); |
| rec.fFontID = typeface->uniqueID(); |
| rec.fTextSize = SkPaint::kCanonicalTextSizeForPaths; |
| rec.fPreScaleX = rec.fPost2x2[0][0] = rec.fPost2x2[1][1] = SK_Scalar1; |
| // Don't bake stroke information into the glyphs, we'll let the GPU do the stroking. |
| |
| SkAutoDescriptor ad(sizeof(rec) + SkDescriptor::ComputeOverhead(1)); |
| SkDescriptor* genericDesc = ad.getDesc(); |
| |
| genericDesc->init(); |
| genericDesc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| genericDesc->computeChecksum(); |
| |
| SkAutoTUnref<GlyphGenerator> generator(SkNEW_ARGS(GlyphGenerator, (*typeface, *genericDesc))); |
| return this->createPathRange(generator, stroke); |
| } |