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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
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 SkColorFilter_DEFINED | 8 #ifndef SkColorFilter_DEFINED |
9 #define SkColorFilter_DEFINED | 9 #define SkColorFilter_DEFINED |
10 | 10 |
11 #include "SkColor.h" | 11 #include "SkColor.h" |
12 #include "SkFlattenable.h" | 12 #include "SkFlattenable.h" |
13 #include "SkRefCnt.h" | 13 #include "SkRefCnt.h" |
14 #include "SkXfermode.h" | 14 #include "SkXfermode.h" |
15 | 15 |
16 class GrContext; | 16 class GrContext; |
17 class GrFragmentProcessor; | 17 class GrFragmentProcessor; |
18 class SkBitmap; | 18 class SkBitmap; |
19 class SkRasterPipeline; | |
20 | 19 |
21 /** | 20 /** |
22 * ColorFilters are optional objects in the drawing pipeline. When present in | 21 * ColorFilters are optional objects in the drawing pipeline. When present in |
23 * a paint, they are called with the "src" colors, and return new colors, which | 22 * a paint, they are called with the "src" colors, and return new colors, which |
24 * are then passed onto the next stage (either ImageFilter or Xfermode). | 23 * are then passed onto the next stage (either ImageFilter or Xfermode). |
25 * | 24 * |
26 * All subclasses are required to be reentrant-safe : it must be legal to share | 25 * All subclasses are required to be reentrant-safe : it must be legal to share |
27 * the same instance between several threads. | 26 * the same instance between several threads. |
28 */ | 27 */ |
29 class SK_API SkColorFilter : public SkFlattenable { | 28 class SK_API SkColorFilter : public SkFlattenable { |
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64 The implementation writes out its filtered version into result[]. | 63 The implementation writes out its filtered version into result[]. |
65 Note: shader and result may be the same buffer. | 64 Note: shader and result may be the same buffer. |
66 @param src array of colors, possibly generated by a shader | 65 @param src array of colors, possibly generated by a shader |
67 @param count the number of entries in the src[] and result[] arrays | 66 @param count the number of entries in the src[] and result[] arrays |
68 @param result written by the filter | 67 @param result written by the filter |
69 */ | 68 */ |
70 virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[]
) const = 0; | 69 virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[]
) const = 0; |
71 | 70 |
72 virtual void filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) co
nst; | 71 virtual void filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) co
nst; |
73 | 72 |
74 bool appendStages(SkRasterPipeline*) const; | |
75 | |
76 enum Flags { | 73 enum Flags { |
77 /** If set the filter methods will not change the alpha channel of the c
olors. | 74 /** If set the filter methods will not change the alpha channel of the c
olors. |
78 */ | 75 */ |
79 kAlphaUnchanged_Flag = 1 << 0, | 76 kAlphaUnchanged_Flag = 1 << 0, |
80 }; | 77 }; |
81 | 78 |
82 /** Returns the flags for this filter. Override in subclasses to return cust
om flags. | 79 /** Returns the flags for this filter. Override in subclasses to return cust
om flags. |
83 */ | 80 */ |
84 virtual uint32_t getFlags() const { return 0; } | 81 virtual uint32_t getFlags() const { return 0; } |
85 | 82 |
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164 } | 161 } |
165 | 162 |
166 SK_TO_STRING_PUREVIRT() | 163 SK_TO_STRING_PUREVIRT() |
167 | 164 |
168 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | 165 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
169 SK_DEFINE_FLATTENABLE_TYPE(SkColorFilter) | 166 SK_DEFINE_FLATTENABLE_TYPE(SkColorFilter) |
170 | 167 |
171 protected: | 168 protected: |
172 SkColorFilter() {} | 169 SkColorFilter() {} |
173 | 170 |
174 virtual bool onAppendStages(SkRasterPipeline*) const; | |
175 | |
176 private: | 171 private: |
177 /* | 172 /* |
178 * Returns 1 if this is a single filter (not a composition of other filters
), otherwise it | 173 * Returns 1 if this is a single filter (not a composition of other filters
), otherwise it |
179 * reutrns the number of leaf-node filters in a composition. This should be
the same value | 174 * reutrns the number of leaf-node filters in a composition. This should be
the same value |
180 * as the number of GrFragmentProcessors returned by asFragmentProcessors's
array parameter. | 175 * as the number of GrFragmentProcessors returned by asFragmentProcessors's
array parameter. |
181 * | 176 * |
182 * e.g. compose(filter, compose(compose(filter, filter), filter)) --> 4 | 177 * e.g. compose(filter, compose(compose(filter, filter), filter)) --> 4 |
183 */ | 178 */ |
184 virtual int privateComposedFilterCount() const { return 1; } | 179 virtual int privateComposedFilterCount() const { return 1; } |
185 friend class SkComposeColorFilter; | 180 friend class SkComposeColorFilter; |
186 | 181 |
187 typedef SkFlattenable INHERITED; | 182 typedef SkFlattenable INHERITED; |
188 }; | 183 }; |
189 | 184 |
190 #endif | 185 #endif |
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