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1 | |
2 /* | 1 /* |
3 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
4 * | 3 * |
5 * 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 |
6 * found in the LICENSE file. | 5 * found in the LICENSE file. |
7 */ | 6 */ |
8 | 7 |
9 | |
10 #ifndef SkClampRange_DEFINED | 8 #ifndef SkClampRange_DEFINED |
11 #define SkClampRange_DEFINED | 9 #define SkClampRange_DEFINED |
12 | 10 |
13 #include "SkFixed.h" | 11 #include "SkFixed.h" |
| 12 #include "SkScalar.h" |
| 13 |
| 14 #define SK_SUPPORT_LEGACY_GRADIENT_PRECISION |
| 15 |
| 16 #ifdef SK_SUPPORT_LEGACY_GRADIENT_PRECISION |
| 17 #define SkGradFixed SkFixed |
| 18 #define SkScalarToGradFixed SkScalarToFixed |
| 19 #define SkFixedToGradFixed(x) (x) |
| 20 #define SkGradFixedToFixed(x) (x) |
| 21 #define kFracMax_SkGradFixed 0xFFFF |
| 22 #else |
| 23 #define SkGradFixed SkFixed3232 |
| 24 #define SkScalarToGradFixed SkScalarToFixed3232 |
| 25 #define SkFixedToGradFixed SkFixedToFixed3232 |
| 26 #define SkGradFixedToFixed(x) (SkFixed)((x) >> 16) |
| 27 #define kFracMax_SkGradFixed 0xFFFFFFFFLL |
| 28 #endif |
14 | 29 |
15 /** | 30 /** |
16 * Iteration fixed fx by dx, clamping as you go to [0..0xFFFF], this class | 31 * Iteration fixed fx by dx, clamping as you go to [0..kFracMax_SkGradFixed], t
his class |
17 * computes the (up to) 3 spans there are: | 32 * computes the (up to) 3 spans there are: |
18 * | 33 * |
19 * range0: use constant value V0 | 34 * range0: use constant value V0 |
20 * range1: iterate as usual fx += dx | 35 * range1: iterate as usual fx += dx |
21 * range2: use constant value V1 | 36 * range2: use constant value V1 |
22 */ | 37 */ |
23 struct SkClampRange { | 38 struct SkClampRange { |
24 int fCount0; // count for fV0 | 39 int fCount0; // count for fV0 |
25 int fCount1; // count for interpolating (fV0...fV1) | 40 int fCount1; // count for interpolating (fV0...fV1) |
26 int fCount2; // count for fV1 | 41 int fCount2; // count for fV1 |
27 SkFixed fFx1; // initial fx value for the fCount1 range. | 42 SkGradFixed fFx1; // initial fx value for the fCount1 range. |
28 // only valid if fCount1 > 0 | 43 // only valid if fCount1 > 0 |
29 int fV0, fV1; | 44 int fV0, fV1; |
30 | 45 |
31 void init(SkFixed fx, SkFixed dx, int count, int v0, int v1); | 46 void init(SkGradFixed fx, SkGradFixed dx, int count, int v0, int v1); |
32 | 47 |
33 private: | 48 private: |
34 void initFor1(SkFixed fx); | 49 void initFor1(SkGradFixed fx); |
35 }; | 50 }; |
36 | 51 |
37 #endif | 52 #endif |
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