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| 1 |
| 1 /* | 2 /* |
| 2 * Copyright 2013 Google Inc. | 3 * Copyright 2013 Google Inc. |
| 3 * | 4 * |
| 4 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. | 6 * found in the LICENSE file. |
| 6 */ | 7 */ |
| 7 | 8 |
| 9 |
| 8 #ifndef SkBitmapFilter_DEFINED | 10 #ifndef SkBitmapFilter_DEFINED |
| 9 #define SkBitmapFilter_DEFINED | 11 #define SkBitmapFilter_DEFINED |
| 10 | 12 |
| 11 #include "SkFixed.h" | |
| 12 #include "SkMath.h" | 13 #include "SkMath.h" |
| 13 #include "SkScalar.h" | |
| 14 | 14 |
| 15 // size of the precomputed bitmap filter tables for high quality filtering. | 15 // size of the precomputed bitmap filter tables for high quality filtering. |
| 16 // Used to precompute the shape of the filter kernel. | 16 // Used to precompute the shape of the filter kernel. |
| 17 // Table size chosen from experiments to see where I could start to see a differ
ence. | 17 // Table size chosen from experiments to see where I could start to see a differ
ence. |
| 18 | 18 |
| 19 #define SKBITMAP_FILTER_TABLE_SIZE 128 | 19 #define SKBITMAP_FILTER_TABLE_SIZE 128 |
| 20 | 20 |
| 21 class SkBitmapFilter { | 21 class SkBitmapFilter { |
| 22 public: | 22 public: |
| 23 SkBitmapFilter(float width) | 23 SkBitmapFilter(float width) |
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| 166 return 1.0f; // Special case the discontinuity at the origin. | 166 return 1.0f; // Special case the discontinuity at the origin. |
| 167 } | 167 } |
| 168 float xpi = x * static_cast<float>(SK_ScalarPI); | 168 float xpi = x * static_cast<float>(SK_ScalarPI); |
| 169 return (sk_float_sin(xpi) / xpi) * // sinc(x) | 169 return (sk_float_sin(xpi) / xpi) * // sinc(x) |
| 170 sk_float_sin(xpi / fWidth) / (xpi / fWidth); // sinc(x/fWidth
) | 170 sk_float_sin(xpi / fWidth) / (xpi / fWidth); // sinc(x/fWidth
) |
| 171 } | 171 } |
| 172 }; | 172 }; |
| 173 | 173 |
| 174 | 174 |
| 175 #endif | 175 #endif |
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