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author | 2008-12-17 15:59:43 +0000 | |
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committer | 2008-12-17 15:59:43 +0000 | |
commit | 8a1c16ff38322f0210116fa7293eb8817c7e477e (patch) | |
tree | fe40e07f6c8983318a2f79032b9a706ede1090c1 /src/images/SkScaledBitmapSampler.h | |
parent | 2559c629078f738ac37095d896d580b681ac6a30 (diff) |
grab from latest android
git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/images/SkScaledBitmapSampler.h')
-rw-r--r-- | src/images/SkScaledBitmapSampler.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/images/SkScaledBitmapSampler.h b/src/images/SkScaledBitmapSampler.h new file mode 100644 index 0000000000..0bb99242a7 --- /dev/null +++ b/src/images/SkScaledBitmapSampler.h @@ -0,0 +1,55 @@ +#ifndef SkScaledBitmapSampler_DEFINED +#define SkScaledBitmapSampler_DEFINED + +#include "SkTypes.h" + +class SkBitmap; + +class SkScaledBitmapSampler { +public: + SkScaledBitmapSampler(int origWidth, int origHeight, int cellSize); + + int scaledWidth() const { return fScaledWidth; } + int scaledHeight() const { return fScaledHeight; } + + int srcY0() const { return fY0; } + int srcDY() const { return fDY; } + + enum SrcConfig { + kGray, // 1 byte per pixel + kIndex, // 1 byte per pixel + kRGB, // 3 bytes per pixel + kRGBX, // 4 byes per pixel (ignore 4th) + kRGBA // 4 bytes per pixel + }; + + // Given a dst bitmap (with pixels already allocated) and a src-config, + // prepares iterator to process the src colors and write them into dst. + // Returns false if the request cannot be fulfulled. + bool begin(SkBitmap* dst, SrcConfig sc, bool doDither); + // call with row of src pixels, for y = 0...scaledHeight-1. + // returns true if the row had non-opaque alpha in it + bool next(const uint8_t* SK_RESTRICT src); + +private: + int fScaledWidth; + int fScaledHeight; + + int fX0; // first X coord to sample + int fY0; // first Y coord (scanline) to sample + int fDX; // step between X samples + int fDY; // step between Y samples + + typedef bool (*RowProc)(void* SK_RESTRICT dstRow, + const uint8_t* SK_RESTRICT src, + int width, int deltaSrc, int y); + + // setup state + char* fDstRow; // points into bitmap's pixels + int fDstRowBytes; + int fCurrY; // used for dithering + int fSrcPixelSize; // 1, 3, 4 + RowProc fRowProc; +}; + +#endif |