34 lines
924 B
NASM
34 lines
924 B
NASM
mcopy rawdec.macros
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gen on
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case on
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* Pointer to direct page space for use by these routines
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dpPtr data
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ds 4
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end
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* DP locations
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destOfst gequ 0 offset into destBuf to start at
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endOfst gequ 2 offset into destBuf to end before
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loop1End gequ 4 offset into destBuf to end loop 1
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oldDB gequ 6 data bank on entry
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oldDP gequ 8 direct page on entry
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* Generates 640-mode SHR pixels [destBuf+startOffset, destBuf+endOffset)
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* from raw pixels starting at lineDataPtr. Returns next lineDataPtr value.
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*
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* First loop is unrolled to minimize index calculation overhead,
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* and runs until less that 8 iterations (output bytes) remain.
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* Second loop generates the remaining bytes.
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*
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* unsigned char * rawDecode640(unsigned startOffset, unsigned endOffset,
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* unsigned char *lineDataPtr);
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rawDecode640 start rawDec640
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rawdec 640,8
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end
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* Same for 320-mode
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rawDecode320 start rawDec320
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rawdec 320,8
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end
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