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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/cmd/jpg/totruecolor.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <draw.h>
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#include "imagefile.h"
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enum {
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	c1 = 2871,	/* 1.402 * 2048 */
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	c2 = 705,		/* 0.34414 * 2048 */
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	c3 = 1463,	/* 0.71414 * 2048 */
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	c4 = 3629,	/* 1.772 * 2048 */
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};
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Rawimage*
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totruecolor(Rawimage *i, int chandesc)
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{
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	int j, k;
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	Rawimage *im;
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	char err[ERRMAX];
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	uchar *rp, *gp, *bp, *cmap, *inp, *outp, cmap1[3*256];
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	int r, g, b, Y, Cr, Cb;
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	if(chandesc!=CY && chandesc!=CRGB24)
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		return _remaperror("remap: can't convert to chandesc %d", chandesc);
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	err[0] = '\0';
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	errstr(err, sizeof err);	/* throw it away */
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	im = malloc(sizeof(Rawimage));
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	if(im == nil)
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		return nil;
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	memset(im, 0, sizeof(Rawimage));
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	if(chandesc == CY)
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		im->chanlen = i->chanlen;
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	else
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		im->chanlen = 3*i->chanlen;
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	im->chandesc = chandesc;
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	im->chans[0] = malloc(im->chanlen);
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	if(im->chans[0] == nil){
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		free(im);
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		return nil;
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	}
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	im->r = i->r;
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	im->nchans = 1;
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	cmap = i->cmap;
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	outp = im->chans[0];
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	switch(i->chandesc){
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	default:
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		return _remaperror("remap: can't recognize channel type %d", i->chandesc);
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	case CY:
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		if(i->nchans != 1)
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			return _remaperror("remap: Y image has %d chans", i->nchans);
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		if(chandesc == CY){
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			memmove(im->chans[0], i->chans[0], i->chanlen);
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			break;
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		}
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		/* convert to three color */
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		inp = i->chans[0];
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		for(j=0; j<i->chanlen; j++){
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			k = *inp++;
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			*outp++ = k;
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			*outp++ = k;
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			*outp++ = k;
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		}
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		break;
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	case CRGB1:
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		if(cmap == nil)
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			return _remaperror("remap: image has no color map");
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		if(i->nchans != 1)
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			return _remaperror("remap: can't handle nchans %d", i->nchans);
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		for(j=1; j<=8; j++)
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			if(i->cmaplen == 3*(1<<j))
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				break;
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		if(j > 8)
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			return _remaperror("remap: can't do colormap size 3*%d", i->cmaplen/3);
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		if(i->cmaplen != 3*256){
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			/* to avoid a range check in loop below, make a full-size cmap */
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			memmove(cmap1, cmap, i->cmaplen);
82 
			cmap = cmap1;
83 
		}
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		inp = i->chans[0];
85 
		if(chandesc == CY){
86 
			for(j=0; j<i->chanlen; j++){
87 
				k = *inp++;
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				r = cmap[3*k+2];
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				g = cmap[3*k+1];
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				b = cmap[3*k+0];
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				r = (2125*r + 7154*g + 721*b)/10000;	/* Poynton page 84 */
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				*outp++ = r;
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			}
94 
		}else{
95 
			for(j=0; j<i->chanlen; j++){
96 
				k = *inp++;
97 
				*outp++ = cmap[3*k+2];
98 
				*outp++ = cmap[3*k+1];
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				*outp++ = cmap[3*k+0];
100 
			}
101 
		}
102 
		break;
103 
 
104 
	case CRGB:
105 
		if(i->nchans != 3)
106 
			return _remaperror("remap: can't handle nchans %d", i->nchans);
107 
		rp = i->chans[0];
108 
		gp = i->chans[1];
109 
		bp = i->chans[2];
110 
		if(chandesc == CY){
111 
			for(j=0; j<i->chanlen; j++){
112 
				r = *bp++;
113 
				g = *gp++;
114 
				b = *rp++;
115 
				r = (2125*r + 7154*g + 721*b)/10000;	/* Poynton page 84 */
116 
				*outp++ = r;
117 
			}
118 
		}else
119 
			for(j=0; j<i->chanlen; j++){
120 
				*outp++ = *bp++;
121 
				*outp++ = *gp++;
122 
				*outp++ = *rp++;
123 
			}
124 
		break;
125 
 
126 
	case CYCbCr:
127 
		if(i->nchans != 3)
128 
			return _remaperror("remap: can't handle nchans %d", i->nchans);
129 
		rp = i->chans[0];
130 
		gp = i->chans[1];
131 
		bp = i->chans[2];
132 
		for(j=0; j<i->chanlen; j++){
133 
			Y = *rp++ << 11;
134 
			Cb = *gp++ - 128;
135 
			Cr = *bp++ - 128;
136 
			r = (Y+c1*Cr) >> 11;
137 
			g = (Y-c2*Cb-c3*Cr) >> 11;
138 
			b = (Y+c4*Cb) >> 11;
139 
			if(r < 0)
140 
				r = 0;
141 
			if(r > 255)
142 
				r = 255;
143 
			if(g < 0)
144 
				g = 0;
145 
			if(g > 255)
146 
				g = 255;
147 
			if(b < 0)
148 
				b = 0;
149 
			if(b > 255)
150 
				b = 255;
151 
			if(chandesc == CY){
152 
				r = (2125*r + 7154*g + 721*b)/10000;
153 
				*outp++ = r;
154 
			}else{
155 
				*outp++ = b;
156 
				*outp++ = g;
157 
				*outp++ = r;
158 
			}
159 
		}
160 
		break;
161 
	}
162 
	return im;
163 
}