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#ifndef BITMAP_SCROLLER_H_
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#define BITMAP_SCROLLER_H_
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#include <stdint.h>
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/**
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* This type definition describes a function which is supposed to provide an
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* eight-by-one pixel chunk of a bitmap for a given bit plane. The x-coordinates
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* are based on chunks, not on pixels (i.e. nChunkX=2 has to be interpreted as
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* a pixel based x-coordinate of 16). This way it is easy to provide the bitmap
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* via a simple lookup in an uint8_t typed array. (0,0) is considered as the top
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* left coordinate.
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* @param nBitPlane Number of the desired bit plane.
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* @param nChunkX x-coordinate of the chunk.
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* @param nChunkY y-coordinate of the chunk.
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* @param nFrame The current frame number (in case you want to animate sth.).
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* @return an eight-by-one chunk of the bitmap packed into an uint8_t typed
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*/
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typedef uint8_t (*bitmap_getChunk_t)(unsigned char const nBitPlane,
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unsigned char const nChunkX,
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unsigned char const nChunkY,
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unsigned int const nFrame);
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void bitmap_scroll(unsigned char const nWidth,
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unsigned char const nHeight,
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unsigned char const nBitPlanes,
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unsigned int const nTickCount,
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unsigned int const nTick,
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unsigned char const nFrameTickDivider,
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unsigned char const nMovementTickDivider,
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bitmap_getChunk_t fpGetChunk);
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#endif /* BITMAP_SCROLLER_H_ */
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