The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/gpu/GrSWMaskHelper.h
gfx/skia/trunk/src/gpu/GrSWMaskHelper.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:0b8a6bda804c |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 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 GrSWMaskHelper_DEFINED | |
| 9 #define GrSWMaskHelper_DEFINED | |
| 10 | |
| 11 #include "GrColor.h" | |
| 12 #include "GrDrawState.h" | |
| 13 #include "SkBitmap.h" | |
| 14 #include "SkDraw.h" | |
| 15 #include "SkMatrix.h" | |
| 16 #include "SkRasterClip.h" | |
| 17 #include "SkRegion.h" | |
| 18 #include "SkTypes.h" | |
| 19 | |
| 20 class GrAutoScratchTexture; | |
| 21 class GrContext; | |
| 22 class GrTexture; | |
| 23 class SkPath; | |
| 24 class SkStrokeRec; | |
| 25 class GrDrawTarget; | |
| 26 | |
| 27 /** | |
| 28 * The GrSWMaskHelper helps generate clip masks using the software rendering | |
| 29 * path. It is intended to be used as: | |
| 30 * | |
| 31 * GrSWMaskHelper helper(context); | |
| 32 * helper.init(...); | |
| 33 * | |
| 34 * draw one or more paths/rects specifying the required boolean ops | |
| 35 * | |
| 36 * toTexture(); // to get it from the internal bitmap to the GPU | |
| 37 * | |
| 38 * The result of this process will be the final mask (on the GPU) in the | |
| 39 * upper left hand corner of the texture. | |
| 40 */ | |
| 41 class GrSWMaskHelper : public SkNoncopyable { | |
| 42 public: | |
| 43 GrSWMaskHelper(GrContext* context) | |
| 44 : fContext(context) { | |
| 45 } | |
| 46 | |
| 47 // set up the internal state in preparation for draws. Since many masks | |
| 48 // may be accumulated in the helper during creation, "resultBounds" | |
| 49 // allows the caller to specify the region of interest - to limit the | |
| 50 // amount of work. | |
| 51 bool init(const SkIRect& resultBounds, const SkMatrix* matrix); | |
| 52 | |
| 53 // Draw a single rect into the accumulation bitmap using the specified op | |
| 54 void draw(const SkRect& rect, SkRegion::Op op, | |
| 55 bool antiAlias, uint8_t alpha); | |
| 56 | |
| 57 // Draw a single path into the accumuation bitmap using the specified op | |
| 58 void draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op, | |
| 59 bool antiAlias, uint8_t alpha); | |
| 60 | |
| 61 // Helper function to get a scratch texture suitable for capturing the | |
| 62 // result (i.e., right size & format) | |
| 63 bool getTexture(GrAutoScratchTexture* texture); | |
| 64 | |
| 65 // Move the mask generation results from the internal bitmap to the gpu. | |
| 66 void toTexture(GrTexture* texture); | |
| 67 | |
| 68 // Reset the internal bitmap | |
| 69 void clear(uint8_t alpha) { | |
| 70 fBM.eraseColor(SkColorSetARGB(alpha, alpha, alpha, alpha)); | |
| 71 } | |
| 72 | |
| 73 // Canonical usage utility that draws a single path and uploads it | |
| 74 // to the GPU. The result is returned in "result". | |
| 75 static GrTexture* DrawPathMaskToTexture(GrContext* context, | |
| 76 const SkPath& path, | |
| 77 const SkStrokeRec& stroke, | |
| 78 const SkIRect& resultBounds, | |
| 79 bool antiAlias, | |
| 80 SkMatrix* matrix); | |
| 81 | |
| 82 // This utility routine is used to add a path's mask to some other draw. | |
| 83 // The ClipMaskManager uses it to accumulate clip masks while the | |
| 84 // GrSoftwarePathRenderer uses it to fulfill a drawPath call. | |
| 85 // It draws with "texture" as a path mask into "target" using "rect" as | |
| 86 // geometry and the current drawState. The current drawState is altered to | |
| 87 // accommodate the mask. | |
| 88 // Note that this method assumes that the GrPaint::kTotalStages slot in | |
| 89 // the draw state can be used to hold the mask texture stage. | |
| 90 // This method is really only intended to be used with the | |
| 91 // output of DrawPathMaskToTexture. | |
| 92 static void DrawToTargetWithPathMask(GrTexture* texture, | |
| 93 GrDrawTarget* target, | |
| 94 const SkIRect& rect); | |
| 95 | |
| 96 protected: | |
| 97 private: | |
| 98 GrContext* fContext; | |
| 99 SkMatrix fMatrix; | |
| 100 SkBitmap fBM; | |
| 101 SkDraw fDraw; | |
| 102 SkRasterClip fRasterClip; | |
| 103 | |
| 104 typedef SkNoncopyable INHERITED; | |
| 105 }; | |
| 106 | |
| 107 #endif // GrSWMaskHelper_DEFINED |
