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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 SkClampRange_DEFINED | 8 #ifndef SkClampRange_DEFINED |
9 #define SkClampRange_DEFINED | 9 #define SkClampRange_DEFINED |
10 | 10 |
11 #include "SkFixed.h" | 11 #include "SkFixed.h" |
12 #include "SkScalar.h" | 12 #include "SkScalar.h" |
13 | 13 |
14 #define SkGradFixed SkFixed3232 | 14 #define SkGradFixed SkFixed3232 |
15 #define SkScalarToGradFixed(x) SkScalarToFixed3232(x) | 15 #define SkScalarToGradFixed(x) SkScalarToFixed3232(x) |
| 16 #define SkFloatToGradFixed(x) SkFloatToFixed3232(x) |
16 #define SkFixedToGradFixed(x) SkFixedToFixed3232(x) | 17 #define SkFixedToGradFixed(x) SkFixedToFixed3232(x) |
17 #define SkGradFixedToFixed(x) (SkFixed)((x) >> 16) | 18 #define SkGradFixedToFixed(x) (SkFixed)((x) >> 16) |
| 19 #define SkGradFixedToFloat(x) SkFixed3232ToFloat(x) |
18 #define kFracMax_SkGradFixed 0xFFFFFFFFLL | 20 #define kFracMax_SkGradFixed 0xFFFFFFFFLL |
19 | 21 |
20 /** | 22 /** |
21 * Iteration fixed fx by dx, clamping as you go to [0..kFracMax_SkGradFixed], t
his class | 23 * Iteration fixed fx by dx, clamping as you go to [0..kFracMax_SkGradFixed], t
his class |
22 * computes the (up to) 3 spans there are: | 24 * computes the (up to) 3 spans there are: |
23 * | 25 * |
24 * range0: use constant value V0 | 26 * range0: use constant value V0 |
25 * range1: iterate as usual fx += dx | 27 * range1: iterate as usual fx += dx |
26 * range2: use constant value V1 | 28 * range2: use constant value V1 |
27 */ | 29 */ |
28 struct SkClampRange { | 30 struct SkClampRange { |
29 int fCount0; // count for fV0 | 31 int fCount0; // count for fV0 |
30 int fCount1; // count for interpolating (fV0...fV1) | 32 int fCount1; // count for interpolating (fV0...fV1) |
31 int fCount2; // count for fV1 | 33 int fCount2; // count for fV1 |
32 SkGradFixed fFx1; // initial fx value for the fCount1 range. | 34 SkGradFixed fFx1; // initial fx value for the fCount1 range. |
33 // only valid if fCount1 > 0 | 35 // only valid if fCount1 > 0 |
34 int fV0, fV1; | 36 int fV0, fV1; |
35 | 37 |
36 void init(SkGradFixed fx, SkGradFixed dx, int count, int v0, int v1); | 38 void init(float fx, float dx, int count, int v0, int v1); |
37 | 39 |
38 void validate(int count) const { | 40 void validate(int count) const { |
39 #ifdef SK_DEBUG | 41 #ifdef SK_DEBUG |
40 SkASSERT(fCount0 >= 0); | 42 SkASSERT(fCount0 >= 0); |
41 SkASSERT(fCount1 >= 0); | 43 SkASSERT(fCount1 >= 0); |
42 SkASSERT(fCount2 >= 0); | 44 SkASSERT(fCount2 >= 0); |
43 SkASSERT(fCount0 + fCount1 + fCount2 == count); | 45 SkASSERT(fCount0 + fCount1 + fCount2 == count); |
44 #endif | 46 #endif |
45 } | 47 } |
46 | 48 |
47 private: | 49 private: |
48 void initFor1(SkGradFixed fx); | 50 void initFor1(SkGradFixed fx); |
49 }; | 51 }; |
50 | 52 |
51 #endif | 53 #endif |
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