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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrSWMaskHelper_DEFINED | 8 #ifndef GrSWMaskHelper_DEFINED |
9 #define GrSWMaskHelper_DEFINED | 9 #define GrSWMaskHelper_DEFINED |
10 | 10 |
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35 * draw one or more paths/rects specifying the required boolean ops | 35 * draw one or more paths/rects specifying the required boolean ops |
36 * | 36 * |
37 * toTexture(); // to get it from the internal bitmap to the GPU | 37 * toTexture(); // to get it from the internal bitmap to the GPU |
38 * | 38 * |
39 * The result of this process will be the final mask (on the GPU) in the | 39 * The result of this process will be the final mask (on the GPU) in the |
40 * upper left hand corner of the texture. | 40 * upper left hand corner of the texture. |
41 */ | 41 */ |
42 class GrSWMaskHelper : SkNoncopyable { | 42 class GrSWMaskHelper : SkNoncopyable { |
43 public: | 43 public: |
44 GrSWMaskHelper(GrContext* context) | 44 GrSWMaskHelper(GrContext* context) |
45 : fContext(context), fCompressMask(false) { | 45 : fContext(context) |
| 46 , fCompressionMode(kNone_CompressionMode) { |
46 } | 47 } |
47 | 48 |
48 // set up the internal state in preparation for draws. Since many masks | 49 // set up the internal state in preparation for draws. Since many masks |
49 // may be accumulated in the helper during creation, "resultBounds" | 50 // may be accumulated in the helper during creation, "resultBounds" |
50 // allows the caller to specify the region of interest - to limit the | 51 // allows the caller to specify the region of interest - to limit the |
51 // amount of work. | 52 // amount of work. |
52 bool init(const SkIRect& resultBounds, const SkMatrix* matrix); | 53 bool init(const SkIRect& resultBounds, const SkMatrix* matrix); |
53 | 54 |
54 // Draw a single rect into the accumulation bitmap using the specified op | 55 // Draw a single rect into the accumulation bitmap using the specified op |
55 void draw(const SkRect& rect, SkRegion::Op op, | 56 void draw(const SkRect& rect, SkRegion::Op op, |
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87 // geometry and the current drawState. The current drawState is altered to | 88 // geometry and the current drawState. The current drawState is altered to |
88 // accommodate the mask. | 89 // accommodate the mask. |
89 // Note that this method assumes that the GrPaint::kTotalStages slot in | 90 // Note that this method assumes that the GrPaint::kTotalStages slot in |
90 // the draw state can be used to hold the mask texture stage. | 91 // the draw state can be used to hold the mask texture stage. |
91 // This method is really only intended to be used with the | 92 // This method is really only intended to be used with the |
92 // output of DrawPathMaskToTexture. | 93 // output of DrawPathMaskToTexture. |
93 static void DrawToTargetWithPathMask(GrTexture* texture, | 94 static void DrawToTargetWithPathMask(GrTexture* texture, |
94 GrDrawTarget* target, | 95 GrDrawTarget* target, |
95 const SkIRect& rect); | 96 const SkIRect& rect); |
96 | 97 |
97 protected: | |
98 private: | 98 private: |
99 GrContext* fContext; | 99 GrContext* fContext; |
100 SkMatrix fMatrix; | 100 SkMatrix fMatrix; |
101 SkBitmap fBM; | 101 SkBitmap fBM; |
102 SkDraw fDraw; | 102 SkDraw fDraw; |
103 SkRasterClip fRasterClip; | 103 SkRasterClip fRasterClip; |
104 | 104 |
105 // This flag says whether or not we should compress the mask. If | 105 // This enum says whether or not we should compress the mask: |
106 // it is true, then fCompressedFormat is always valid. | 106 // kNone_CompressionMode: compression is not supported on this device. |
107 bool fCompressMask; | 107 // kCompress_CompressionMode: compress the bitmap before it gets sent to the
gpu |
| 108 // kBlitter_CompressionMode: write to the bitmap using a special compressed
blitter. |
| 109 enum CompressionMode { |
| 110 kNone_CompressionMode, |
| 111 kCompress_CompressionMode, |
| 112 kBlitter_CompressionMode, |
| 113 } fCompressionMode; |
| 114 |
| 115 // This is the buffer into which we store our compressed data. This buffer i
s |
| 116 // only allocated (non-null) if fCompressionMode is kBlitter_CompressionMode |
| 117 SkAutoMalloc fCompressedBuffer; |
108 | 118 |
109 // This is the desired format within which to compress the | 119 // This is the desired format within which to compress the |
110 // texture. This value is only valid if fCompressMask is true. | 120 // texture. This value is only valid if fCompressionMode is not kNone_Compre
ssionMode. |
111 SkTextureCompressor::Format fCompressedFormat; | 121 SkTextureCompressor::Format fCompressedFormat; |
112 | 122 |
113 // Actually sends the texture data to the GPU. This is called from | 123 // Actually sends the texture data to the GPU. This is called from |
114 // toTexture with the data filled in depending on the texture config. | 124 // toTexture with the data filled in depending on the texture config. |
115 void sendTextureData(GrTexture *texture, const GrTextureDesc& desc, | 125 void sendTextureData(GrTexture *texture, const GrTextureDesc& desc, |
116 const void *data, int rowbytes); | 126 const void *data, int rowbytes); |
117 | 127 |
118 // Compresses the bitmap stored in fBM and sends the compressed data | 128 // Compresses the bitmap stored in fBM and sends the compressed data |
119 // to the GPU to be stored in 'texture' using sendTextureData. | 129 // to the GPU to be stored in 'texture' using sendTextureData. |
120 void compressTextureData(GrTexture *texture, const GrTextureDesc& desc); | 130 void compressTextureData(GrTexture *texture, const GrTextureDesc& desc); |
121 | 131 |
122 typedef SkNoncopyable INHERITED; | 132 typedef SkNoncopyable INHERITED; |
123 }; | 133 }; |
124 | 134 |
125 #endif // GrSWMaskHelper_DEFINED | 135 #endif // GrSWMaskHelper_DEFINED |
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