1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/imago2/conv.c	Sat Sep 19 05:51:51 2015 +0300
     1.3 @@ -0,0 +1,251 @@
     1.4 +/*
     1.5 +libimago - a multi-format image file input/output library.
     1.6 +Copyright (C) 2010 John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU Lesser General Public License as published
    1.10 +by the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU Lesser General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU Lesser General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +#include <string.h>
    1.22 +#include "imago2.h"
    1.23 +
    1.24 +/* pixel-format conversions are sub-optimal at the moment to avoid
    1.25 + * writing a lot of code. optimize at some point ?
    1.26 + */
    1.27 +
    1.28 +#define CLAMP(x, a, b)	((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
    1.29 +
    1.30 +struct pixel {
    1.31 +	float r, g, b, a;
    1.32 +};
    1.33 +
    1.34 +static void unpack_grey8(struct pixel *unp, void *pptr, int count);
    1.35 +static void unpack_rgb24(struct pixel *unp, void *pptr, int count);
    1.36 +static void unpack_rgba32(struct pixel *unp, void *pptr, int count);
    1.37 +static void unpack_greyf(struct pixel *unp, void *pptr, int count);
    1.38 +static void unpack_rgbf(struct pixel *unp, void *pptr, int count);
    1.39 +static void unpack_rgbaf(struct pixel *unp, void *pptr, int count);
    1.40 +
    1.41 +static void pack_grey8(void *pptr, struct pixel *unp, int count);
    1.42 +static void pack_rgb24(void *pptr, struct pixel *unp, int count);
    1.43 +static void pack_rgba32(void *pptr, struct pixel *unp, int count);
    1.44 +static void pack_greyf(void *pptr, struct pixel *unp, int count);
    1.45 +static void pack_rgbf(void *pptr, struct pixel *unp, int count);
    1.46 +static void pack_rgbaf(void *pptr, struct pixel *unp, int count);
    1.47 +
    1.48 +/* XXX keep in sync with enum img_fmt at imago2.h */
    1.49 +static void (*unpack[])(struct pixel*, void*, int) = {
    1.50 +	unpack_grey8,
    1.51 +	unpack_rgb24,
    1.52 +	unpack_rgba32,
    1.53 +	unpack_greyf,
    1.54 +	unpack_rgbf,
    1.55 +	unpack_rgbaf
    1.56 +};
    1.57 +
    1.58 +/* XXX keep in sync with enum img_fmt at imago2.h */
    1.59 +static void (*pack[])(void*, struct pixel*, int) = {
    1.60 +	pack_grey8,
    1.61 +	pack_rgb24,
    1.62 +	pack_rgba32,
    1.63 +	pack_greyf,
    1.64 +	pack_rgbf,
    1.65 +	pack_rgbaf
    1.66 +};
    1.67 +
    1.68 +
    1.69 +int img_convert(struct img_pixmap *img, enum img_fmt tofmt)
    1.70 +{
    1.71 +	struct pixel pbuf[8];
    1.72 +	int bufsz = (img->width & 7) == 0 ? 8 : ((img->width & 3) == 0 ? 4 : 1);
    1.73 +	int i, num_pix = img->width * img->height;
    1.74 +	int num_iter = num_pix / bufsz;
    1.75 +	char *sptr, *dptr;
    1.76 +	struct img_pixmap nimg;
    1.77 +
    1.78 +	if(img->fmt == tofmt) {
    1.79 +		return 0;	/* nothing to do */
    1.80 +	}
    1.81 +
    1.82 +	img_init(&nimg);
    1.83 +	if(img_set_pixels(&nimg, img->width, img->height, tofmt, 0) == -1) {
    1.84 +		img_destroy(&nimg);
    1.85 +		return -1;
    1.86 +	}
    1.87 +
    1.88 +	sptr = img->pixels;
    1.89 +	dptr = nimg.pixels;
    1.90 +
    1.91 +	for(i=0; i<num_iter; i++) {
    1.92 +		unpack[img->fmt](pbuf, sptr, bufsz);
    1.93 +		pack[tofmt](dptr, pbuf, bufsz);
    1.94 +
    1.95 +		sptr += bufsz * img->pixelsz;
    1.96 +		dptr += bufsz * nimg.pixelsz;
    1.97 +	}
    1.98 +
    1.99 +	img_copy(img, &nimg);
   1.100 +	img_destroy(&nimg);
   1.101 +	return 0;
   1.102 +}
   1.103 +
   1.104 +/* the following functions *could* benefit from SIMD */
   1.105 +
   1.106 +static void unpack_grey8(struct pixel *unp, void *pptr, int count)
   1.107 +{
   1.108 +	int i;
   1.109 +	unsigned char *pix = pptr;
   1.110 +
   1.111 +	for(i=0; i<count; i++) {
   1.112 +		unp->r = unp->g = unp->b = (float)*pix++ / 255.0;
   1.113 +		unp->a = 1.0;
   1.114 +		unp++;
   1.115 +	}
   1.116 +}
   1.117 +
   1.118 +static void unpack_rgb24(struct pixel *unp, void *pptr, int count)
   1.119 +{
   1.120 +	int i;
   1.121 +	unsigned char *pix = pptr;
   1.122 +
   1.123 +	for(i=0; i<count; i++) {
   1.124 +		unp->r = (float)*pix++ / 255.0;
   1.125 +		unp->g = (float)*pix++ / 255.0;
   1.126 +		unp->b = (float)*pix++ / 255.0;
   1.127 +		unp->a = 1.0;
   1.128 +		unp++;
   1.129 +	}
   1.130 +}
   1.131 +
   1.132 +static void unpack_rgba32(struct pixel *unp, void *pptr, int count)
   1.133 +{
   1.134 +	memcpy(unp, pptr, count * sizeof *unp);
   1.135 +}
   1.136 +
   1.137 +static void unpack_greyf(struct pixel *unp, void *pptr, int count)
   1.138 +{
   1.139 +	int i;
   1.140 +	float *pix = pptr;
   1.141 +
   1.142 +	for(i=0; i<count; i++) {
   1.143 +		unp->r = unp->g = unp->b = *pix++;
   1.144 +		unp->a = 1.0;
   1.145 +		unp++;
   1.146 +	}
   1.147 +}
   1.148 +
   1.149 +static void unpack_rgbf(struct pixel *unp, void *pptr, int count)
   1.150 +{
   1.151 +	int i;
   1.152 +	float *pix = pptr;
   1.153 +
   1.154 +	for(i=0; i<count; i++) {
   1.155 +		unp->r = *pix++;
   1.156 +		unp->g = *pix++;
   1.157 +		unp->b = *pix++;
   1.158 +		unp->a = 1.0;
   1.159 +		unp++;
   1.160 +	}
   1.161 +}
   1.162 +
   1.163 +static void unpack_rgbaf(struct pixel *unp, void *pptr, int count)
   1.164 +{
   1.165 +	int i;
   1.166 +	float *pix = pptr;
   1.167 +
   1.168 +	for(i=0; i<count; i++) {
   1.169 +		unp->r = *pix++;
   1.170 +		unp->g = *pix++;
   1.171 +		unp->b = *pix++;
   1.172 +		unp->a = *pix++;
   1.173 +		unp++;
   1.174 +	}
   1.175 +}
   1.176 +
   1.177 +
   1.178 +static void pack_grey8(void *pptr, struct pixel *unp, int count)
   1.179 +{
   1.180 +	int i;
   1.181 +	unsigned char *pix = pptr;
   1.182 +
   1.183 +	for(i=0; i<count; i++) {
   1.184 +		int lum = (int)(255.0 * (unp->r + unp->g + unp->b) / 3.0);
   1.185 +		*pix++ = CLAMP(lum, 0, 255);
   1.186 +		unp++;
   1.187 +	}
   1.188 +}
   1.189 +
   1.190 +static void pack_rgb24(void *pptr, struct pixel *unp, int count)
   1.191 +{
   1.192 +	int i;
   1.193 +	unsigned char *pix = pptr;
   1.194 +
   1.195 +	for(i=0; i<count; i++) {
   1.196 +		int r = (int)(unp->r * 255.0);
   1.197 +		int g = (int)(unp->g * 255.0);
   1.198 +		int b = (int)(unp->b * 255.0);
   1.199 +
   1.200 +		*pix++ = CLAMP(r, 0, 255);
   1.201 +		*pix++ = CLAMP(g, 0, 255);
   1.202 +		*pix++ = CLAMP(b, 0, 255);
   1.203 +		unp++;
   1.204 +	}
   1.205 +}
   1.206 +
   1.207 +static void pack_rgba32(void *pptr, struct pixel *unp, int count)
   1.208 +{
   1.209 +	int i;
   1.210 +	unsigned char *pix = pptr;
   1.211 +
   1.212 +	for(i=0; i<count; i++) {
   1.213 +		int r = (int)(unp->r * 255.0);
   1.214 +		int g = (int)(unp->g * 255.0);
   1.215 +		int b = (int)(unp->b * 255.0);
   1.216 +		int a = (int)(unp->a * 255.0);
   1.217 +
   1.218 +		*pix++ = CLAMP(r, 0, 255);
   1.219 +		*pix++ = CLAMP(g, 0, 255);
   1.220 +		*pix++ = CLAMP(b, 0, 255);
   1.221 +		*pix++ = CLAMP(a, 0, 255);
   1.222 +		unp++;
   1.223 +	}
   1.224 +}
   1.225 +
   1.226 +static void pack_greyf(void *pptr, struct pixel *unp, int count)
   1.227 +{
   1.228 +	int i;
   1.229 +	float *pix = pptr;
   1.230 +
   1.231 +	for(i=0; i<count; i++) {
   1.232 +		*pix++ = (unp->r + unp->g + unp->b) / 3.0;
   1.233 +		unp++;
   1.234 +	}
   1.235 +}
   1.236 +
   1.237 +static void pack_rgbf(void *pptr, struct pixel *unp, int count)
   1.238 +{
   1.239 +	int i;
   1.240 +	float *pix = pptr;
   1.241 +
   1.242 +	for(i=0; i<count; i++) {
   1.243 +		*pix++ = unp->r;
   1.244 +		*pix++ = unp->g;
   1.245 +		*pix++ = unp->b;
   1.246 +		unp++;
   1.247 +	}
   1.248 +}
   1.249 +
   1.250 +static void pack_rgbaf(void *pptr, struct pixel *unp, int count)
   1.251 +{
   1.252 +	memcpy(pptr, unp, count * sizeof *unp);
   1.253 +}
   1.254 +