1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "GrPathRendering.h"
9 #include "SkDescriptor.h"
10 #include "SkGlyph.h"
11 #include "SkMatrix.h"
12 #include "SkTypeface.h"
13 #include "GrPathRange.h"
14
15 class GlyphGenerator : public GrPathRange::PathGenerator {
16 public:
GlyphGenerator(const SkTypeface & typeface,const SkDescriptor & desc)17 GlyphGenerator(const SkTypeface& typeface, const SkDescriptor& desc)
18 : fScalerContext(typeface.createScalerContext(&desc))
19 #ifdef SK_DEBUG
20 , fDesc(desc.copy())
21 #endif
22 {}
23
~GlyphGenerator()24 virtual ~GlyphGenerator() {
25 #ifdef SK_DEBUG
26 SkDescriptor::Free(fDesc);
27 #endif
28 }
29
getNumPaths()30 int getNumPaths() override {
31 return fScalerContext->getGlyphCount();
32 }
33
generatePath(int glyphID,SkPath * out)34 void generatePath(int glyphID, SkPath* out) override {
35 SkGlyph skGlyph;
36 skGlyph.initWithGlyphID(glyphID);
37 fScalerContext->getMetrics(&skGlyph);
38
39 fScalerContext->getPath(skGlyph, out);
40 }
41 #ifdef SK_DEBUG
isEqualTo(const SkDescriptor & desc) const42 bool isEqualTo(const SkDescriptor& desc) const override {
43 return fDesc->equals(desc);
44 }
45 #endif
46 private:
47 const SkAutoTDelete<SkScalerContext> fScalerContext;
48 #ifdef SK_DEBUG
49 SkDescriptor* const fDesc;
50 #endif
51 };
52
createGlyphs(const SkTypeface * typeface,const SkDescriptor * desc,const GrStrokeInfo & stroke)53 GrPathRange* GrPathRendering::createGlyphs(const SkTypeface* typeface,
54 const SkDescriptor* desc,
55 const GrStrokeInfo& stroke) {
56 if (nullptr == typeface) {
57 typeface = SkTypeface::GetDefaultTypeface();
58 SkASSERT(nullptr != typeface);
59 }
60
61 if (desc) {
62 SkAutoTUnref<GlyphGenerator> generator(new GlyphGenerator(*typeface, *desc));
63 return this->createPathRange(generator, stroke);
64 }
65
66 SkScalerContextRec rec;
67 memset(&rec, 0, sizeof(rec));
68 rec.fFontID = typeface->uniqueID();
69 rec.fTextSize = SkPaint::kCanonicalTextSizeForPaths;
70 rec.fPreScaleX = rec.fPost2x2[0][0] = rec.fPost2x2[1][1] = SK_Scalar1;
71 // Don't bake stroke information into the glyphs, we'll let the GPU do the stroking.
72
73 SkAutoDescriptor ad(sizeof(rec) + SkDescriptor::ComputeOverhead(1));
74 SkDescriptor* genericDesc = ad.getDesc();
75
76 genericDesc->init();
77 genericDesc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
78 genericDesc->computeChecksum();
79
80 SkAutoTUnref<GlyphGenerator> generator(new GlyphGenerator(*typeface, *genericDesc));
81 return this->createPathRange(generator, stroke);
82 }
83