gfx/skia/trunk/src/gpu/GrSWMaskHelper.h@6474c204b198 (annotated)
gfx/skia/trunk/src/gpu/GrSWMaskHelper.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2012 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef GrSWMaskHelper_DEFINED |
| michael@0 | 9 | #define GrSWMaskHelper_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #include "GrColor.h" |
| michael@0 | 12 | #include "GrDrawState.h" |
| michael@0 | 13 | #include "SkBitmap.h" |
| michael@0 | 14 | #include "SkDraw.h" |
| michael@0 | 15 | #include "SkMatrix.h" |
| michael@0 | 16 | #include "SkRasterClip.h" |
| michael@0 | 17 | #include "SkRegion.h" |
| michael@0 | 18 | #include "SkTypes.h" |
| michael@0 | 19 | |
| michael@0 | 20 | class GrAutoScratchTexture; |
| michael@0 | 21 | class GrContext; |
| michael@0 | 22 | class GrTexture; |
| michael@0 | 23 | class SkPath; |
| michael@0 | 24 | class SkStrokeRec; |
| michael@0 | 25 | class GrDrawTarget; |
| michael@0 | 26 | |
| michael@0 | 27 | /** |
| michael@0 | 28 | * The GrSWMaskHelper helps generate clip masks using the software rendering |
| michael@0 | 29 | * path. It is intended to be used as: |
| michael@0 | 30 | * |
| michael@0 | 31 | * GrSWMaskHelper helper(context); |
| michael@0 | 32 | * helper.init(...); |
| michael@0 | 33 | * |
| michael@0 | 34 | * draw one or more paths/rects specifying the required boolean ops |
| michael@0 | 35 | * |
| michael@0 | 36 | * toTexture(); // to get it from the internal bitmap to the GPU |
| michael@0 | 37 | * |
| michael@0 | 38 | * The result of this process will be the final mask (on the GPU) in the |
| michael@0 | 39 | * upper left hand corner of the texture. |
| michael@0 | 40 | */ |
| michael@0 | 41 | class GrSWMaskHelper : public SkNoncopyable { |
| michael@0 | 42 | public: |
| michael@0 | 43 | GrSWMaskHelper(GrContext* context) |
| michael@0 | 44 | : fContext(context) { |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | // set up the internal state in preparation for draws. Since many masks |
| michael@0 | 48 | // may be accumulated in the helper during creation, "resultBounds" |
| michael@0 | 49 | // allows the caller to specify the region of interest - to limit the |
| michael@0 | 50 | // amount of work. |
| michael@0 | 51 | bool init(const SkIRect& resultBounds, const SkMatrix* matrix); |
| michael@0 | 52 | |
| michael@0 | 53 | // Draw a single rect into the accumulation bitmap using the specified op |
| michael@0 | 54 | void draw(const SkRect& rect, SkRegion::Op op, |
| michael@0 | 55 | bool antiAlias, uint8_t alpha); |
| michael@0 | 56 | |
| michael@0 | 57 | // Draw a single path into the accumuation bitmap using the specified op |
| michael@0 | 58 | void draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op, |
| michael@0 | 59 | bool antiAlias, uint8_t alpha); |
| michael@0 | 60 | |
| michael@0 | 61 | // Helper function to get a scratch texture suitable for capturing the |
| michael@0 | 62 | // result (i.e., right size & format) |
| michael@0 | 63 | bool getTexture(GrAutoScratchTexture* texture); |
| michael@0 | 64 | |
| michael@0 | 65 | // Move the mask generation results from the internal bitmap to the gpu. |
| michael@0 | 66 | void toTexture(GrTexture* texture); |
| michael@0 | 67 | |
| michael@0 | 68 | // Reset the internal bitmap |
| michael@0 | 69 | void clear(uint8_t alpha) { |
| michael@0 | 70 | fBM.eraseColor(SkColorSetARGB(alpha, alpha, alpha, alpha)); |
| michael@0 | 71 | } |
| michael@0 | 72 | |
| michael@0 | 73 | // Canonical usage utility that draws a single path and uploads it |
| michael@0 | 74 | // to the GPU. The result is returned in "result". |
| michael@0 | 75 | static GrTexture* DrawPathMaskToTexture(GrContext* context, |
| michael@0 | 76 | const SkPath& path, |
| michael@0 | 77 | const SkStrokeRec& stroke, |
| michael@0 | 78 | const SkIRect& resultBounds, |
| michael@0 | 79 | bool antiAlias, |
| michael@0 | 80 | SkMatrix* matrix); |
| michael@0 | 81 | |
| michael@0 | 82 | // This utility routine is used to add a path's mask to some other draw. |
| michael@0 | 83 | // The ClipMaskManager uses it to accumulate clip masks while the |
| michael@0 | 84 | // GrSoftwarePathRenderer uses it to fulfill a drawPath call. |
| michael@0 | 85 | // It draws with "texture" as a path mask into "target" using "rect" as |
| michael@0 | 86 | // geometry and the current drawState. The current drawState is altered to |
| michael@0 | 87 | // accommodate the mask. |
| michael@0 | 88 | // Note that this method assumes that the GrPaint::kTotalStages slot in |
| michael@0 | 89 | // the draw state can be used to hold the mask texture stage. |
| michael@0 | 90 | // This method is really only intended to be used with the |
| michael@0 | 91 | // output of DrawPathMaskToTexture. |
| michael@0 | 92 | static void DrawToTargetWithPathMask(GrTexture* texture, |
| michael@0 | 93 | GrDrawTarget* target, |
| michael@0 | 94 | const SkIRect& rect); |
| michael@0 | 95 | |
| michael@0 | 96 | protected: |
| michael@0 | 97 | private: |
| michael@0 | 98 | GrContext* fContext; |
| michael@0 | 99 | SkMatrix fMatrix; |
| michael@0 | 100 | SkBitmap fBM; |
| michael@0 | 101 | SkDraw fDraw; |
| michael@0 | 102 | SkRasterClip fRasterClip; |
| michael@0 | 103 | |
| michael@0 | 104 | typedef SkNoncopyable INHERITED; |
| michael@0 | 105 | }; |
| michael@0 | 106 | |
| michael@0 | 107 | #endif // GrSWMaskHelper_DEFINED |
