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1 /* | |
2 * Copyright 2015 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 #ifndef GrAtlasTextContext_DEFINED | |
9 #define GrAtlasTextContext_DEFINED | |
10 | |
11 #include "GrTextContext.h" | |
12 | |
13 #include "GrAtlasTextBlob.h" | |
14 #include "GrDistanceFieldAdjustTable.h" | |
15 #include "GrGeometryProcessor.h" | |
16 #include "SkTextBlobRunIterator.h" | |
17 | |
18 #ifdef GR_TEST_UTILS | |
19 #include "GrBatchTest.h" | |
20 #endif | |
21 | |
22 class GrDrawBatch; | |
23 class GrDrawContext; | |
24 class GrDrawTarget; | |
25 class GrPipelineBuilder; | |
26 class GrTextBlobCache; | |
27 class SkGlyph; | |
28 | |
29 /* | |
30 * This class implements GrTextContext using standard bitmap fonts, and can also
process textblobs. | |
31 */ | |
32 class GrAtlasTextContext : public GrTextContext { | |
33 public: | |
34 static GrAtlasTextContext* Create(GrContext*, const SkSurfaceProps&); | |
35 | |
36 private: | |
37 GrAtlasTextContext(GrContext*, const SkSurfaceProps&); | |
38 ~GrAtlasTextContext() override {} | |
39 | |
40 bool canDraw(const SkPaint&, const SkMatrix& viewMatrix) override; | |
41 | |
42 void onDrawText(GrDrawContext*, const GrClip&, const GrPaint&, const SkPaint
&, | |
43 const SkMatrix& viewMatrix, const char text[], size_t byteLe
ngth, | |
44 SkScalar x, SkScalar y, const SkIRect& regionClipBounds) ove
rride; | |
45 void onDrawPosText(GrDrawContext*, const GrClip&, const GrPaint&, | |
46 const SkPaint&, const SkMatrix& viewMatrix, | |
47 const char text[], size_t byteLength, | |
48 const SkScalar pos[], int scalarsPerPosition, | |
49 const SkPoint& offset, const SkIRect& regionClipBounds) o
verride; | |
50 void drawTextBlob(GrDrawContext*, const GrClip&, const SkPaint&, | |
51 const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x,
SkScalar y, | |
52 SkDrawFilter*, const SkIRect& clipBounds) override; | |
53 | |
54 typedef GrAtlasTextBlob::Run Run; | |
55 typedef Run::SubRunInfo PerSubRunInfo; | |
56 | |
57 inline bool canDrawAsDistanceFields(const SkPaint&, const SkMatrix& viewMatr
ix); | |
58 GrAtlasTextBlob* setupDFBlob(int glyphCount, const SkPaint& origPaint, | |
59 const SkMatrix& viewMatrix, SkPaint* dfPaint, | |
60 SkScalar* textRatio); | |
61 void bmpAppendGlyph(GrAtlasTextBlob*, int runIndex, const SkGlyph&, int left
, int top, | |
62 GrColor color, GrFontScaler*); | |
63 bool dfAppendGlyph(GrAtlasTextBlob*, int runIndex, const SkGlyph&, SkScalar
sx, SkScalar sy, | |
64 GrColor color, GrFontScaler*, SkScalar textRatio, | |
65 const SkMatrix& viewMatrix); | |
66 | |
67 // A helper for drawing BitmapText in a run of distance fields | |
68 inline void fallbackDrawPosText(GrAtlasTextBlob*, int runIndex, | |
69 const GrClip&, GrColor color, | |
70 const SkPaint&, const SkMatrix& viewMatrix, | |
71 const SkTDArray<char>& fallbackTxt, | |
72 const SkTDArray<SkScalar>& fallbackPos, | |
73 int scalarsPerPosition, | |
74 const SkPoint& offset); | |
75 | |
76 void internalDrawDFText(GrAtlasTextBlob*, int runIndex, const SkPaint&, | |
77 GrColor color, const SkMatrix& viewMatrix, | |
78 const char text[], size_t byteLength, | |
79 SkScalar x, SkScalar y, | |
80 SkScalar textRatio, | |
81 SkTDArray<char>* fallbackTxt, | |
82 SkTDArray<SkScalar>* fallbackPos, | |
83 SkPoint* offset, const SkPaint& origPaint); | |
84 void internalDrawDFPosText(GrAtlasTextBlob*, int runIndex, const SkPaint&, | |
85 GrColor color, const SkMatrix& viewMatrix, | |
86 const char text[], size_t byteLength, | |
87 const SkScalar pos[], int scalarsPerPosition, | |
88 const SkPoint& offset, | |
89 SkScalar textRatio, | |
90 SkTDArray<char>* fallbackTxt, | |
91 SkTDArray<SkScalar>* fallbackPos); | |
92 | |
93 // sets up the descriptor on the blob and returns a detached cache. Client
must attach | |
94 inline static GrColor ComputeCanonicalColor(const SkPaint&, bool lcd); | |
95 inline SkGlyphCache* setupCache(Run*, const SkPaint&, const SkMatrix* viewMa
trix, bool noGamma); | |
96 void regenerateTextBlob(GrAtlasTextBlob* bmp, const SkPaint& skPaint, GrColo
r, | |
97 const SkMatrix& viewMatrix, | |
98 const SkTextBlob* blob, SkScalar x, SkScalar y, | |
99 SkDrawFilter* drawFilter, | |
100 const GrClip&); | |
101 inline static bool HasLCD(const SkTextBlob*); | |
102 inline void initDistanceFieldPaint(GrAtlasTextBlob*, SkPaint*, SkScalar* tex
tRatio, | |
103 const SkMatrix&); | |
104 | |
105 // Test methods | |
106 // TODO this is really ugly. It'd be much nicer if positioning could be mov
ed to batch | |
107 inline GrAtlasTextBlob* createDrawTextBlob(const GrClip&, const GrPaint&, | |
108 const SkPaint&, const SkMatrix& v
iewMatrix, | |
109 const char text[], size_t byteLen
gth, | |
110 SkScalar x, SkScalar y, | |
111 const SkIRect& regionClipBounds); | |
112 inline GrAtlasTextBlob* createDrawPosTextBlob(const GrClip&, const GrPaint&, | |
113 const SkPaint&, const SkMatrix
& viewMatrix, | |
114 const char text[], size_t byte
Length, | |
115 const SkScalar pos[], int scal
arsPerPosition, | |
116 const SkPoint& offset, | |
117 const SkIRect& regionClipBound
s); | |
118 const GrDistanceFieldAdjustTable* dfAdjustTable() const { return fDistanceAd
justTable; } | |
119 | |
120 GrBatchTextStrike* fCurrStrike; | |
121 GrTextBlobCache* fCache; | |
122 SkAutoTUnref<const GrDistanceFieldAdjustTable> fDistanceAdjustTable; | |
123 | |
124 #ifdef GR_TEST_UTILS | |
125 DRAW_BATCH_TEST_FRIEND(TextBlobBatch); | |
126 #endif | |
127 | |
128 typedef GrTextContext INHERITED; | |
129 }; | |
130 | |
131 #endif | |
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