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annotate libs/libimago/src/conv.c @ 10:819c7ebb1bec

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added libimago to avoid the external dependency
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 18 Jul 2014 05:07:40 +0300
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nuclear@10 1 /*
nuclear@10 2 libimago - a multi-format image file input/output library.
nuclear@10 3 Copyright (C) 2010 John Tsiombikas <nuclear@member.fsf.org>
nuclear@10 4
nuclear@10 5 This program is free software: you can redistribute it and/or modify
nuclear@10 6 it under the terms of the GNU Lesser General Public License as published
nuclear@10 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@10 8 (at your option) any later version.
nuclear@10 9
nuclear@10 10 This program is distributed in the hope that it will be useful,
nuclear@10 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@10 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@10 13 GNU Lesser General Public License for more details.
nuclear@10 14
nuclear@10 15 You should have received a copy of the GNU Lesser General Public License
nuclear@10 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@10 17 */
nuclear@10 18 #include <string.h>
nuclear@10 19 #include "imago2.h"
nuclear@10 20
nuclear@10 21 /* pixel-format conversions are sub-optimal at the moment to avoid
nuclear@10 22 * writing a lot of code. optimize at some point ?
nuclear@10 23 */
nuclear@10 24
nuclear@10 25 #define CLAMP(x, a, b) ((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
nuclear@10 26
nuclear@10 27 struct pixel {
nuclear@10 28 float r, g, b, a;
nuclear@10 29 };
nuclear@10 30
nuclear@10 31 static void unpack_grey8(struct pixel *unp, void *pptr, int count);
nuclear@10 32 static void unpack_rgb24(struct pixel *unp, void *pptr, int count);
nuclear@10 33 static void unpack_rgba32(struct pixel *unp, void *pptr, int count);
nuclear@10 34 static void unpack_greyf(struct pixel *unp, void *pptr, int count);
nuclear@10 35 static void unpack_rgbf(struct pixel *unp, void *pptr, int count);
nuclear@10 36 static void unpack_rgbaf(struct pixel *unp, void *pptr, int count);
nuclear@10 37
nuclear@10 38 static void pack_grey8(void *pptr, struct pixel *unp, int count);
nuclear@10 39 static void pack_rgb24(void *pptr, struct pixel *unp, int count);
nuclear@10 40 static void pack_rgba32(void *pptr, struct pixel *unp, int count);
nuclear@10 41 static void pack_greyf(void *pptr, struct pixel *unp, int count);
nuclear@10 42 static void pack_rgbf(void *pptr, struct pixel *unp, int count);
nuclear@10 43 static void pack_rgbaf(void *pptr, struct pixel *unp, int count);
nuclear@10 44
nuclear@10 45 /* XXX keep in sync with enum img_fmt at imago2.h */
nuclear@10 46 static void (*unpack[])(struct pixel*, void*, int) = {
nuclear@10 47 unpack_grey8,
nuclear@10 48 unpack_rgb24,
nuclear@10 49 unpack_rgba32,
nuclear@10 50 unpack_greyf,
nuclear@10 51 unpack_rgbf,
nuclear@10 52 unpack_rgbaf
nuclear@10 53 };
nuclear@10 54
nuclear@10 55 /* XXX keep in sync with enum img_fmt at imago2.h */
nuclear@10 56 static void (*pack[])(void*, struct pixel*, int) = {
nuclear@10 57 pack_grey8,
nuclear@10 58 pack_rgb24,
nuclear@10 59 pack_rgba32,
nuclear@10 60 pack_greyf,
nuclear@10 61 pack_rgbf,
nuclear@10 62 pack_rgbaf
nuclear@10 63 };
nuclear@10 64
nuclear@10 65
nuclear@10 66 int img_convert(struct img_pixmap *img, enum img_fmt tofmt)
nuclear@10 67 {
nuclear@10 68 struct pixel pbuf[8];
nuclear@10 69 int bufsz = (img->width & 7) == 0 ? 8 : ((img->width & 3) == 0 ? 4 : 1);
nuclear@10 70 int i, num_pix = img->width * img->height;
nuclear@10 71 int num_iter = num_pix / bufsz;
nuclear@10 72 char *sptr, *dptr;
nuclear@10 73 struct img_pixmap nimg;
nuclear@10 74
nuclear@10 75 if(img->fmt == tofmt) {
nuclear@10 76 return 0; /* nothing to do */
nuclear@10 77 }
nuclear@10 78
nuclear@10 79 img_init(&nimg);
nuclear@10 80 if(img_set_pixels(&nimg, img->width, img->height, tofmt, 0) == -1) {
nuclear@10 81 img_destroy(&nimg);
nuclear@10 82 return -1;
nuclear@10 83 }
nuclear@10 84
nuclear@10 85 sptr = img->pixels;
nuclear@10 86 dptr = nimg.pixels;
nuclear@10 87
nuclear@10 88 for(i=0; i<num_iter; i++) {
nuclear@10 89 unpack[img->fmt](pbuf, sptr, bufsz);
nuclear@10 90 pack[tofmt](dptr, pbuf, bufsz);
nuclear@10 91
nuclear@10 92 sptr += bufsz * img->pixelsz;
nuclear@10 93 dptr += bufsz * nimg.pixelsz;
nuclear@10 94 }
nuclear@10 95
nuclear@10 96 img_copy(img, &nimg);
nuclear@10 97 img_destroy(&nimg);
nuclear@10 98 return 0;
nuclear@10 99 }
nuclear@10 100
nuclear@10 101 /* the following functions *could* benefit from SIMD */
nuclear@10 102
nuclear@10 103 static void unpack_grey8(struct pixel *unp, void *pptr, int count)
nuclear@10 104 {
nuclear@10 105 int i;
nuclear@10 106 unsigned char *pix = pptr;
nuclear@10 107
nuclear@10 108 for(i=0; i<count; i++) {
nuclear@10 109 unp->r = unp->g = unp->b = (float)*pix++ / 255.0;
nuclear@10 110 unp->a = 1.0;
nuclear@10 111 unp++;
nuclear@10 112 }
nuclear@10 113 }
nuclear@10 114
nuclear@10 115 static void unpack_rgb24(struct pixel *unp, void *pptr, int count)
nuclear@10 116 {
nuclear@10 117 int i;
nuclear@10 118 unsigned char *pix = pptr;
nuclear@10 119
nuclear@10 120 for(i=0; i<count; i++) {
nuclear@10 121 unp->r = (float)*pix++ / 255.0;
nuclear@10 122 unp->g = (float)*pix++ / 255.0;
nuclear@10 123 unp->b = (float)*pix++ / 255.0;
nuclear@10 124 unp->a = 1.0;
nuclear@10 125 unp++;
nuclear@10 126 }
nuclear@10 127 }
nuclear@10 128
nuclear@10 129 static void unpack_rgba32(struct pixel *unp, void *pptr, int count)
nuclear@10 130 {
nuclear@10 131 int i;
nuclear@10 132 unsigned char *pix = pptr;
nuclear@10 133
nuclear@10 134 for(i=0; i<count; i++) {
nuclear@10 135 unp->r = (float)*pix++ / 255.0;
nuclear@10 136 unp->g = (float)*pix++ / 255.0;
nuclear@10 137 unp->b = (float)*pix++ / 255.0;
nuclear@10 138 unp->a = (float)*pix++ / 255.0;
nuclear@10 139 unp++;
nuclear@10 140 }
nuclear@10 141 }
nuclear@10 142
nuclear@10 143 static void unpack_greyf(struct pixel *unp, void *pptr, int count)
nuclear@10 144 {
nuclear@10 145 int i;
nuclear@10 146 float *pix = pptr;
nuclear@10 147
nuclear@10 148 for(i=0; i<count; i++) {
nuclear@10 149 unp->r = unp->g = unp->b = *pix++;
nuclear@10 150 unp->a = 1.0;
nuclear@10 151 unp++;
nuclear@10 152 }
nuclear@10 153 }
nuclear@10 154
nuclear@10 155 static void unpack_rgbf(struct pixel *unp, void *pptr, int count)
nuclear@10 156 {
nuclear@10 157 int i;
nuclear@10 158 float *pix = pptr;
nuclear@10 159
nuclear@10 160 for(i=0; i<count; i++) {
nuclear@10 161 unp->r = *pix++;
nuclear@10 162 unp->g = *pix++;
nuclear@10 163 unp->b = *pix++;
nuclear@10 164 unp->a = 1.0;
nuclear@10 165 unp++;
nuclear@10 166 }
nuclear@10 167 }
nuclear@10 168
nuclear@10 169 static void unpack_rgbaf(struct pixel *unp, void *pptr, int count)
nuclear@10 170 {
nuclear@10 171 int i;
nuclear@10 172 float *pix = pptr;
nuclear@10 173
nuclear@10 174 for(i=0; i<count; i++) {
nuclear@10 175 unp->r = *pix++;
nuclear@10 176 unp->g = *pix++;
nuclear@10 177 unp->b = *pix++;
nuclear@10 178 unp->a = *pix++;
nuclear@10 179 unp++;
nuclear@10 180 }
nuclear@10 181 }
nuclear@10 182
nuclear@10 183
nuclear@10 184 static void pack_grey8(void *pptr, struct pixel *unp, int count)
nuclear@10 185 {
nuclear@10 186 int i;
nuclear@10 187 unsigned char *pix = pptr;
nuclear@10 188
nuclear@10 189 for(i=0; i<count; i++) {
nuclear@10 190 int lum = (int)(255.0 * (unp->r + unp->g + unp->b) / 3.0);
nuclear@10 191 *pix++ = CLAMP(lum, 0, 255);
nuclear@10 192 unp++;
nuclear@10 193 }
nuclear@10 194 }
nuclear@10 195
nuclear@10 196 static void pack_rgb24(void *pptr, struct pixel *unp, int count)
nuclear@10 197 {
nuclear@10 198 int i;
nuclear@10 199 unsigned char *pix = pptr;
nuclear@10 200
nuclear@10 201 for(i=0; i<count; i++) {
nuclear@10 202 int r = (int)(unp->r * 255.0);
nuclear@10 203 int g = (int)(unp->g * 255.0);
nuclear@10 204 int b = (int)(unp->b * 255.0);
nuclear@10 205
nuclear@10 206 *pix++ = CLAMP(r, 0, 255);
nuclear@10 207 *pix++ = CLAMP(g, 0, 255);
nuclear@10 208 *pix++ = CLAMP(b, 0, 255);
nuclear@10 209 unp++;
nuclear@10 210 }
nuclear@10 211 }
nuclear@10 212
nuclear@10 213 static void pack_rgba32(void *pptr, struct pixel *unp, int count)
nuclear@10 214 {
nuclear@10 215 int i;
nuclear@10 216 unsigned char *pix = pptr;
nuclear@10 217
nuclear@10 218 for(i=0; i<count; i++) {
nuclear@10 219 int r = (int)(unp->r * 255.0);
nuclear@10 220 int g = (int)(unp->g * 255.0);
nuclear@10 221 int b = (int)(unp->b * 255.0);
nuclear@10 222 int a = (int)(unp->a * 255.0);
nuclear@10 223
nuclear@10 224 *pix++ = CLAMP(r, 0, 255);
nuclear@10 225 *pix++ = CLAMP(g, 0, 255);
nuclear@10 226 *pix++ = CLAMP(b, 0, 255);
nuclear@10 227 *pix++ = CLAMP(a, 0, 255);
nuclear@10 228 unp++;
nuclear@10 229 }
nuclear@10 230 }
nuclear@10 231
nuclear@10 232 static void pack_greyf(void *pptr, struct pixel *unp, int count)
nuclear@10 233 {
nuclear@10 234 int i;
nuclear@10 235 float *pix = pptr;
nuclear@10 236
nuclear@10 237 for(i=0; i<count; i++) {
nuclear@10 238 *pix++ = (unp->r + unp->g + unp->b) / 3.0;
nuclear@10 239 unp++;
nuclear@10 240 }
nuclear@10 241 }
nuclear@10 242
nuclear@10 243 static void pack_rgbf(void *pptr, struct pixel *unp, int count)
nuclear@10 244 {
nuclear@10 245 int i;
nuclear@10 246 float *pix = pptr;
nuclear@10 247
nuclear@10 248 for(i=0; i<count; i++) {
nuclear@10 249 *pix++ = unp->r;
nuclear@10 250 *pix++ = unp->g;
nuclear@10 251 *pix++ = unp->b;
nuclear@10 252 unp++;
nuclear@10 253 }
nuclear@10 254 }
nuclear@10 255
nuclear@10 256 static void pack_rgbaf(void *pptr, struct pixel *unp, int count)
nuclear@10 257 {
nuclear@10 258 memcpy(pptr, unp, count * sizeof *unp);
nuclear@10 259 }
nuclear@10 260