mirror of https://github.com/axmolengine/axmol.git
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
#ifndef SkScaledBitmapSampler_DEFINED
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#define SkScaledBitmapSampler_DEFINED
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#include "SkTypes.h"
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#include "SkColor.h"
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class SkBitmap;
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class SkScaledBitmapSampler {
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public:
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SkScaledBitmapSampler(int origWidth, int origHeight, int cellSize);
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int scaledWidth() const { return fScaledWidth; }
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int scaledHeight() const { return fScaledHeight; }
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int srcY0() const { return fY0; }
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int srcDY() const { return fDY; }
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enum SrcConfig {
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kGray, // 1 byte per pixel
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kIndex, // 1 byte per pixel
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kRGB, // 3 bytes per pixel
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kRGBX, // 4 byes per pixel (ignore 4th)
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kRGBA, // 4 bytes per pixel
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kRGB_565 // 2 bytes per pixel
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};
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// Given a dst bitmap (with pixels already allocated) and a src-config,
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// prepares iterator to process the src colors and write them into dst.
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// Returns false if the request cannot be fulfulled.
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bool begin(SkBitmap* dst, SrcConfig sc, bool doDither,
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const SkPMColor* = NULL);
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// call with row of src pixels, for y = 0...scaledHeight-1.
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// returns true if the row had non-opaque alpha in it
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bool next(const uint8_t* SK_RESTRICT src);
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private:
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int fScaledWidth;
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int fScaledHeight;
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int fX0; // first X coord to sample
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int fY0; // first Y coord (scanline) to sample
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int fDX; // step between X samples
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int fDY; // step between Y samples
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typedef bool (*RowProc)(void* SK_RESTRICT dstRow,
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const uint8_t* SK_RESTRICT src,
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int width, int deltaSrc, int y,
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const SkPMColor[]);
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// setup state
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char* fDstRow; // points into bitmap's pixels
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int fDstRowBytes;
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int fCurrY; // used for dithering
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int fSrcPixelSize; // 1, 3, 4
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RowProc fRowProc;
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// optional reference to the src colors if the src is a palette model
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const SkPMColor* fCTable;
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};
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#endif
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