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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 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 SkImageFilter_DEFINED | 8 #ifndef SkImageFilter_DEFINED |
9 #define SkImageFilter_DEFINED | 9 #define SkImageFilter_DEFINED |
10 | 10 |
11 #include "SkFlattenable.h" | 11 #include "SkFlattenable.h" |
12 #include "SkRect.h" | 12 #include "SkRect.h" |
13 | 13 |
14 class SkBitmap; | 14 class SkBitmap; |
15 class SkColorFilter; | 15 class SkColorFilter; |
16 class SkDevice; | 16 class SkDevice; |
17 class SkMatrix; | 17 class SkMatrix; |
18 struct SkIPoint; | 18 struct SkIPoint; |
19 class SkShader; | 19 class SkShader; |
20 class GrEffectRef; | 20 class GrEffectRef; |
21 class GrTexture; | 21 class GrTexture; |
22 | 22 |
23 /** | 23 /** |
24 * Experimental. | |
25 * | |
26 * Base class for image filters. If one is installed in the paint, then | 24 * Base class for image filters. If one is installed in the paint, then |
27 * all drawing occurs as usual, but it is as if the drawing happened into an | 25 * all drawing occurs as usual, but it is as if the drawing happened into an |
28 * offscreen (before the xfermode is applied). This offscreen bitmap will | 26 * offscreen (before the xfermode is applied). This offscreen bitmap will |
29 * then be handed to the imagefilter, who in turn creates a new bitmap which | 27 * then be handed to the imagefilter, who in turn creates a new bitmap which |
30 * is what will finally be drawn to the device (using the original xfermode). | 28 * is what will finally be drawn to the device (using the original xfermode). |
31 * | |
32 * THIS SIGNATURE IS TEMPORARY | |
33 * | |
34 * There are several weaknesses in this function signature: | |
35 * 1. Does not expose the destination/target device, so filters that can draw | |
36 * directly to it are unable to take advantage of that optimization. | |
37 * 2. Does not expose a way to create a "compabitible" image (i.e. gpu -> gpu) | |
38 * 3. As with #1, the filter is unable to "read" the dest (which would be slow) | |
39 * | |
40 * Therefore, we should not create any real dependencies on this API yet -- it | |
41 * is being checked in as a check-point so we can explore these and other | |
42 * considerations. | |
43 */ | 29 */ |
44 class SK_API SkImageFilter : public SkFlattenable { | 30 class SK_API SkImageFilter : public SkFlattenable { |
45 public: | 31 public: |
46 SK_DECLARE_INST_COUNT(SkImageFilter) | 32 SK_DECLARE_INST_COUNT(SkImageFilter) |
47 | 33 |
48 class Proxy { | 34 class Proxy { |
49 public: | 35 public: |
50 virtual ~Proxy() {}; | 36 virtual ~Proxy() {}; |
51 | 37 |
52 virtual SkDevice* createDevice(int width, int height) = 0; | 38 virtual SkDevice* createDevice(int width, int height) = 0; |
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178 bool applyCropRect(SkIRect* rect) const; | 164 bool applyCropRect(SkIRect* rect) const; |
179 | 165 |
180 private: | 166 private: |
181 typedef SkFlattenable INHERITED; | 167 typedef SkFlattenable INHERITED; |
182 int fInputCount; | 168 int fInputCount; |
183 SkImageFilter** fInputs; | 169 SkImageFilter** fInputs; |
184 SkIRect fCropRect; | 170 SkIRect fCropRect; |
185 }; | 171 }; |
186 | 172 |
187 #endif | 173 #endif |
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