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comparison: gfx/skia/trunk/src/images/SkScaledBitmapSampler.h
gfx/skia/trunk/src/images/SkScaledBitmapSampler.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:5e60e1703a21 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #ifndef SkScaledBitmapSampler_DEFINED | |
| 9 #define SkScaledBitmapSampler_DEFINED | |
| 10 | |
| 11 #include "SkTypes.h" | |
| 12 #include "SkColor.h" | |
| 13 #include "SkImageDecoder.h" | |
| 14 | |
| 15 class SkBitmap; | |
| 16 | |
| 17 class SkScaledBitmapSampler { | |
| 18 public: | |
| 19 SkScaledBitmapSampler(int origWidth, int origHeight, int cellSize); | |
| 20 | |
| 21 int scaledWidth() const { return fScaledWidth; } | |
| 22 int scaledHeight() const { return fScaledHeight; } | |
| 23 | |
| 24 int srcY0() const { return fY0; } | |
| 25 int srcDX() const { return fDX; } | |
| 26 int srcDY() const { return fDY; } | |
| 27 | |
| 28 enum SrcConfig { | |
| 29 kGray, // 1 byte per pixel | |
| 30 kIndex, // 1 byte per pixel | |
| 31 kRGB, // 3 bytes per pixel | |
| 32 kRGBX, // 4 byes per pixel (ignore 4th) | |
| 33 kRGBA, // 4 bytes per pixel | |
| 34 kRGB_565 // 2 bytes per pixel | |
| 35 }; | |
| 36 | |
| 37 // Given a dst bitmap (with pixels already allocated) and a src-config, | |
| 38 // prepares iterator to process the src colors and write them into dst. | |
| 39 // Returns false if the request cannot be fulfulled. | |
| 40 bool begin(SkBitmap* dst, SrcConfig sc, const SkImageDecoder& decoder, | |
| 41 const SkPMColor* = NULL); | |
| 42 // call with row of src pixels, for y = 0...scaledHeight-1. | |
| 43 // returns true if the row had non-opaque alpha in it | |
| 44 bool next(const uint8_t* SK_RESTRICT src); | |
| 45 | |
| 46 // Like next(), but specifies the y value of the source row, so the | |
| 47 // rows can come in any order. If the row is not part of the output | |
| 48 // sample, it will be skipped. Only sampleInterlaced OR next should | |
| 49 // be called for one SkScaledBitmapSampler. | |
| 50 bool sampleInterlaced(const uint8_t* SK_RESTRICT src, int srcY); | |
| 51 | |
| 52 typedef bool (*RowProc)(void* SK_RESTRICT dstRow, | |
| 53 const uint8_t* SK_RESTRICT src, | |
| 54 int width, int deltaSrc, int y, | |
| 55 const SkPMColor[]); | |
| 56 | |
| 57 private: | |
| 58 int fScaledWidth; | |
| 59 int fScaledHeight; | |
| 60 | |
| 61 int fX0; // first X coord to sample | |
| 62 int fY0; // first Y coord (scanline) to sample | |
| 63 int fDX; // step between X samples | |
| 64 int fDY; // step between Y samples | |
| 65 | |
| 66 #ifdef SK_DEBUG | |
| 67 // Keep track of whether the caller is using next or sampleInterlaced. | |
| 68 // Only one can be used per sampler. | |
| 69 enum SampleMode { | |
| 70 kUninitialized_SampleMode, | |
| 71 kConsecutive_SampleMode, | |
| 72 kInterlaced_SampleMode, | |
| 73 }; | |
| 74 | |
| 75 SampleMode fSampleMode; | |
| 76 #endif | |
| 77 | |
| 78 // setup state | |
| 79 char* fDstRow; // points into bitmap's pixels | |
| 80 size_t fDstRowBytes; | |
| 81 int fCurrY; // used for dithering | |
| 82 int fSrcPixelSize; // 1, 3, 4 | |
| 83 RowProc fRowProc; | |
| 84 | |
| 85 // optional reference to the src colors if the src is a palette model | |
| 86 const SkPMColor* fCTable; | |
| 87 | |
| 88 #ifdef SK_DEBUG | |
| 89 // Helper class allowing a test to have access to fRowProc. | |
| 90 friend class RowProcTester; | |
| 91 #endif | |
| 92 }; | |
| 93 | |
| 94 #endif |
