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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* This source code is Copyright (C) 2006-2009 by WolfWings. */
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/* It is, however, released under the ISC license. */
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/* en.wikipedia.org/wiki/ISC_Licence */
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/* --------------------------------------------------------- */
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/* It is a formula-level rederiviation of the HQ2x technique */
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/* and is, thus, not a derivative work of the original code, */
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/* only the original equations behind the code. */
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#ifndef __PAST_LIBRARY_H
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#define __PAST_LIBRARY_H
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#include <stdint.h>
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#ifndef __PAST_LIBRARY_WIDTH
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#define __PAST_LIBRARY_WIDTH 256
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#endif
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#ifndef __PAST_LIBRARY_HEIGHT
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#define __PAST_LIBRARY_HEIGHT 224
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#endif
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typedef uint16_t pixel;
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/* These two functions are what need to be modified to interface other
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* pixel formats with the library. They need to return values inside a
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* format like this: (Red/Blue can be reversed.)
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*
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* 0000-00GG-GGG0-0000-0RRR-RR00-000B-BBBB
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*
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* This is VERY fast to create from 15-bit (NOT 16-bit) RGB/BGR, as
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* below.
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*
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* If you can't return data in this format, you'll have to rebuild the
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* ExpandedDiff function and DiffTable array to compensate, and possibly
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* change the blending functions in the Process* functions to handle any
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* guard-bits and masking.
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*/
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static inline uint32_t RGBUnpack(pixel i) {
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uint32_t o = i;
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o = (o * 0x10001);
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o = o & 0x03E07C1F;
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return o;
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}
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static inline pixel RGBPack(uint32_t x) {
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x &= 0x03E07C1F;
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x |= (x >> 16);
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return x;
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}
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void ProcessHQ2x(const pixel * restrict inbuffer, pixel * restrict outbuffer);
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void ProcessHQ4x(const pixel * restrict inbuffer, pixel * restrict outbuffer);
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#endif /* __PAST_LIBRARY_H */
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