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119 lines
2.5 KiB
119 lines
2.5 KiB
/*
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* Convert an image from yuv colourspace to rgb
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*
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* Code by Tony Hague (C) 2001.
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*/
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#include "ccvt.h"
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#include "ccvt_types.h"
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/* by suitable definition of PIXTYPE, can do yuv to rgb or bgr, with or
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without word alignment */
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/* This doesn't exactly earn a prize in a programming beauty contest. */
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#define WHOLE_FUNC2RGB(type) \
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const unsigned char *y1, *y2, *u, *v; \
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PIXTYPE_##type *l1, *l2; \
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int r, g, b, cr, cg, cb, yp, j, i; \
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\
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if ((width & 1) || (height & 1)) \
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return; \
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\
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l1 = (PIXTYPE_##type *)dst; \
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l2 = l1 + width; \
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y1 = (unsigned char *)src; \
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y2 = y1 + width; \
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u = (unsigned char *)src + width * height; \
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v = u + (width * height) / 4; \
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j = height / 2; \
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while (j--) { \
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i = width / 2; \
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while (i--) { \
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/* Since U & V are valid for 4 pixels, repeat code 4 \
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times for different Y */ \
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cb = ((*u-128) * 454)>>8; \
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cr = ((*v-128) * 359)>>8; \
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cg = ((*v-128) * 183 + (*u-128) * 88)>>8; \
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\
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yp = *(y1++); \
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r = yp + cr; \
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b = yp + cb; \
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g = yp - cg; \
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SAT(r); \
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SAT(g); \
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SAT(b); \
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l1->b = b; \
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l1->g = g; \
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l1->r = r; \
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l1++; \
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\
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yp = *(y1++); \
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r = yp + cr; \
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b = yp + cb; \
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g = yp - cg; \
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SAT(r); \
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SAT(g); \
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SAT(b); \
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l1->b = b; \
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l1->g = g; \
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l1->r = r; \
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l1++; \
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\
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yp = *(y2++); \
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r = yp + cr; \
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b = yp + cb; \
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g = yp - cg; \
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SAT(r); \
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SAT(g); \
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SAT(b); \
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l2->b = b; \
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l2->g = g; \
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l2->r = r; \
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l2++; \
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\
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yp = *(y2++); \
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r = yp + cr; \
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b = yp + cb; \
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g = yp - cg; \
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SAT(r); \
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SAT(g); \
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SAT(b); \
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l2->b = b; \
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l2->g = g; \
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l2->r = r; \
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l2++; \
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\
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u++; \
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v++; \
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} \
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y1 = y2; \
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y2 += width; \
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l1 = l2; \
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l2 += width; \
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}
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void ccvt_420p_bgr32(int width, int height, const void *src, void *dst)
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{
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WHOLE_FUNC2RGB(bgr32)
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}
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void ccvt_420p_bgr24(int width, int height, const void *src, void *dst)
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{
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WHOLE_FUNC2RGB(bgr24)
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}
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void ccvt_420p_rgb32(int width, int height, const void *src, void *dst)
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{
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WHOLE_FUNC2RGB(rgb32)
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}
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void ccvt_420p_rgb24(int width, int height, const void *src, void *dst)
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{
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WHOLE_FUNC2RGB(rgb24)
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}
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