shared/image-loader.c

   1 /*
   2  * Copyright © 2008-2012 Kristian Høgsberg
   3  * Copyright © 2012 Intel Corporation
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and its
   6  * documentation for any purpose is hereby granted without fee, provided that
   7  * the above copyright notice appear in all copies and that both that copyright
   8  * notice and this permission notice appear in supporting documentation, and
   9  * that the name of the copyright holders not be used in advertising or
  10  * publicity pertaining to distribution of the software without specific,
  11  * written prior permission.  The copyright holders make no representations
  12  * about the suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  17  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  18  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  19  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  20  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  21  * OF THIS SOFTWARE.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <jpeglib.h>
  30 #include <png.h>
  31 #include <pixman.h>
  32
  33 #include "image-loader.h"
  34
  35 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
  36
  37 #ifdef HAVE_WEBP
  38 #include <webp/decode.h>
  39 #endif
  40
  41 static int
  42 stride_for_width(int width)
  43 {
  44         return width * 4;
  45 }
  46
  47 static void
  48 swizzle_row(JSAMPLE *row, JDIMENSION width)
  49 {
  50         JSAMPLE *s;
  51         uint32_t *d;
  52
  53         s = row + (width - 1) * 3;
  54         d = (uint32_t *) (row + (width - 1) * 4);
  55         while (s >= row) {
  56                 *d = 0xff000000 | (s[0] << 16) | (s[1] << 8) | (s[2] << 0);
  57                 s -= 3;
  58                 d--;
  59         }
  60 }
  61
  62 static void
  63 error_exit(j_common_ptr cinfo)
  64 {
  65         longjmp(cinfo->client_data, 1);
  66 }
  67
  68 static void
  69 pixman_image_destroy_func(pixman_image_t *image, void *data)
  70 {
  71         free(data);
  72 }
  73
  74 static pixman_image_t *
  75 load_jpeg(FILE *fp)
  76 {
  77         struct jpeg_decompress_struct cinfo;
  78         struct jpeg_error_mgr jerr;
  79         pixman_image_t *pixman_image = NULL;
  80         unsigned int i;
  81         int stride, first;
  82         JSAMPLE *data, *rows[4];
  83         jmp_buf env;
  84
  85         cinfo.err = jpeg_std_error(&jerr);
  86         jerr.error_exit = error_exit;
  87         cinfo.client_data = env;
  88         if (setjmp(env))
  89                 return NULL;
  90
  91         jpeg_create_decompress(&cinfo);
  92
  93         jpeg_stdio_src(&cinfo, fp);
  94
  95         jpeg_read_header(&cinfo, TRUE);
  96
  97         cinfo.out_color_space = JCS_RGB;
  98         jpeg_start_decompress(&cinfo);
  99
 100         stride = cinfo.output_width * 4;
 101         data = malloc(stride * cinfo.output_height);
 102         if (data == NULL) {
 103                 fprintf(stderr, "couldn't allocate image data\n");
 104                 return NULL;
 105         }
 106
 107         while (cinfo.output_scanline < cinfo.output_height) {
 108                 first = cinfo.output_scanline;
 109                 for (i = 0; i < ARRAY_LENGTH(rows); i++)
 110                         rows[i] = data + (first + i) * stride;
 111
 112                 jpeg_read_scanlines(&cinfo, rows, ARRAY_LENGTH(rows));
 113                 for (i = 0; first + i < cinfo.output_scanline; i++)
 114                         swizzle_row(rows[i], cinfo.output_width);
 115         }
 116
 117         jpeg_finish_decompress(&cinfo);
 118
 119         jpeg_destroy_decompress(&cinfo);
 120
 121         pixman_image = pixman_image_create_bits(PIXMAN_a8r8g8b8,
 122                                         cinfo.output_width,
 123                                         cinfo.output_height,
 124                                         (uint32_t *) data, stride);
 125
 126         pixman_image_set_destroy_function(pixman_image,
 127                                 pixman_image_destroy_func, data);
 128
 129         return pixman_image;
 130 }
 131
 132 static inline int
 133 multiply_alpha(int alpha, int color)
 134 {
 135     int temp = (alpha * color) + 0x80;
 136
 137     return ((temp + (temp >> 8)) >> 8);
 138 }
 139
 140 static void
 141 premultiply_data(png_structp   png,
 142                  png_row_infop row_info,
 143                  png_bytep     data)
 144 {
 145     unsigned int i;
 146     png_bytep p;
 147
 148     for (i = 0, p = data; i < row_info->rowbytes; i += 4, p += 4) {
 149         png_byte  alpha = p[3];
 150         uint32_t w;
 151
 152         if (alpha == 0) {
 153                 w = 0;
 154         } else {
 155                 png_byte red   = p[0];
 156                 png_byte green = p[1];
 157                 png_byte blue  = p[2];
 158
 159                 if (alpha != 0xff) {
 160                         red   = multiply_alpha(alpha, red);
 161                         green = multiply_alpha(alpha, green);
 162                         blue  = multiply_alpha(alpha, blue);
 163                 }
 164                 w = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
 165         }
 166
 167         * (uint32_t *) p = w;
 168     }
 169 }
 170
 171 static void
 172 read_func(png_structp png, png_bytep data, png_size_t size)
 173 {
 174         FILE *fp = png_get_io_ptr(png);
 175
 176         if (fread(data, 1, size, fp) != size)
 177                 png_error(png, NULL);
 178 }
 179
 180 static void
 181 png_error_callback(png_structp png, png_const_charp error_msg)
 182 {
 183     longjmp (png_jmpbuf (png), 1);
 184 }
 185
 186 static pixman_image_t *
 187 load_png(FILE *fp)
 188 {
 189         png_struct *png;
 190         png_info *info;
 191         png_byte *data = NULL;
 192         png_byte **row_pointers = NULL;
 193         png_uint_32 width, height;
 194         int depth, color_type, interlace, stride;
 195         unsigned int i;
 196         pixman_image_t *pixman_image = NULL;
 197
 198         png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
 199                                      png_error_callback, NULL);
 200         if (!png)
 201                 return NULL;
 202
 203         info = png_create_info_struct(png);
 204         if (!info) {
 205                 png_destroy_read_struct(&png, &info, NULL);
 206                 return NULL;
 207         }
 208
 209         if (setjmp(png_jmpbuf(png))) {
 210                 if (data)
 211                         free(data);
 212                 if (row_pointers)
 213                         free(row_pointers);
 214                 png_destroy_read_struct(&png, &info, NULL);
 215                 return NULL;
 216         }
 217
 218         png_set_read_fn(png, fp, read_func);
 219         png_read_info(png, info);
 220         png_get_IHDR(png, info,
 221                      &width, &height, &depth,
 222                      &color_type, &interlace, NULL, NULL);
 223
 224         if (color_type == PNG_COLOR_TYPE_PALETTE)
 225                 png_set_palette_to_rgb(png);
 226
 227         if (color_type == PNG_COLOR_TYPE_GRAY)
 228                 png_set_expand_gray_1_2_4_to_8(png);
 229
 230         if (png_get_valid(png, info, PNG_INFO_tRNS))
 231                 png_set_tRNS_to_alpha(png);
 232
 233         if (depth == 16)
 234                 png_set_strip_16(png);
 235
 236         if (depth < 8)
 237                 png_set_packing(png);
 238
 239         if (color_type == PNG_COLOR_TYPE_GRAY ||
 240             color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
 241                 png_set_gray_to_rgb(png);
 242
 243         if (interlace != PNG_INTERLACE_NONE)
 244                 png_set_interlace_handling(png);
 245
 246         png_set_filler(png, 0xff, PNG_FILLER_AFTER);
 247         png_set_read_user_transform_fn(png, premultiply_data);
 248         png_read_update_info(png, info);
 249         png_get_IHDR(png, info,
 250                      &width, &height, &depth,
 251                      &color_type, &interlace, NULL, NULL);
 252
 253
 254         stride = stride_for_width(width);
 255         data = malloc(stride * height);
 256         if (!data) {
 257                 png_destroy_read_struct(&png, &info, NULL);
 258                 return NULL;
 259         }
 260
 261         row_pointers = malloc(height * sizeof row_pointers[0]);
 262         if (row_pointers == NULL) {
 263                 free(data);
 264                 png_destroy_read_struct(&png, &info, NULL);
 265                 return NULL;
 266         }
 267
 268         for (i = 0; i < height; i++)
 269                 row_pointers[i] = &data[i * stride];
 270
 271         png_read_image(png, row_pointers);
 272         png_read_end(png, info);
 273
 274         free(row_pointers);
 275         png_destroy_read_struct(&png, &info, NULL);
 276
 277         pixman_image = pixman_image_create_bits(PIXMAN_a8r8g8b8,
 278                                 width, height, (uint32_t *) data, stride);
 279
 280         pixman_image_set_destroy_function(pixman_image,
 281                                 pixman_image_destroy_func, data);
 282
 283         return pixman_image;
 284 }
 285
 286 #ifdef HAVE_WEBP
 287
 288 static pixman_image_t *
 289 load_webp(FILE *fp)
 290 {
 291         WebPDecoderConfig config;
 292         uint8_t buffer[16 * 1024];
 293         int len;
 294         VP8StatusCode status;
 295         WebPIDecoder *idec;
 296
 297         if (!WebPInitDecoderConfig(&config)) {
 298                 fprintf(stderr, "Library version mismatch!\n");
 299                 return NULL;
 300         }
 301
 302         /* webp decoding api doesn't seem to specify a min size that's
 303            usable for GetFeatures, but 256 works... */
 304         len = fread(buffer, 1, 256, fp);
 305         status = WebPGetFeatures(buffer, len, &config.input);
 306         if (status != VP8_STATUS_OK) {
 307                 fprintf(stderr, "failed to parse webp header\n");
 308                 WebPFreeDecBuffer(&config.output);
 309                 return NULL;
 310         }
 311
 312         config.output.colorspace = MODE_BGRA;
 313         config.output.u.RGBA.stride = stride_for_width(config.input.width);
 314         config.output.u.RGBA.size =
 315                 config.output.u.RGBA.stride * config.input.height;
 316         config.output.u.RGBA.rgba =
 317                 malloc(config.output.u.RGBA.stride * config.input.height);
 318         config.output.is_external_memory = 1;
 319         if (!config.output.u.RGBA.rgba) {
 320                 WebPFreeDecBuffer(&config.output);
 321                 return NULL;
 322         }
 323
 324         rewind(fp);
 325         idec = WebPINewDecoder(&config.output);
 326         if (!idec) {
 327                 WebPFreeDecBuffer(&config.output);
 328                 return NULL;
 329         }
 330
 331         while (!feof(fp)) {
 332                 len = fread(buffer, 1, sizeof buffer, fp);
 333                 status = WebPIAppend(idec, buffer, len);
 334                 if (status != VP8_STATUS_OK) {
 335                         fprintf(stderr, "webp decode status %d\n", status);
 336                         WebPIDelete(idec);
 337                         WebPFreeDecBuffer(&config.output);
 338                         return NULL;
 339                 }
 340         }
 341
 342         WebPIDelete(idec);
 343         WebPFreeDecBuffer(&config.output);
 344
 345         return pixman_image_create_bits(PIXMAN_a8r8g8b8,
 346                                         config.input.width,
 347                                         config.input.height,
 348                                         (uint32_t *) config.output.u.RGBA.rgba,
 349                                         config.output.u.RGBA.stride);
 350 }
 351
 352 #endif
 353
 354
 355 struct image_loader {
 356         unsigned char header[4];
 357         int header_size;
 358         pixman_image_t *(*load)(FILE *fp);
 359 };
 360
 361 static const struct image_loader loaders[] = {
 362         { { 0x89, 'P', 'N', 'G' }, 4, load_png },
 363         { { 0xff, 0xd8 }, 2, load_jpeg },
 364 #ifdef HAVE_WEBP
 365         { { 'R', 'I', 'F', 'F' }, 4, load_webp }
 366 #endif
 367 };
 368
 369 pixman_image_t *
 370 load_image(const char *filename)
 371 {
 372         pixman_image_t *image;
 373         unsigned char header[4];
 374         FILE *fp;
 375         unsigned int i;
 376
 377         fp = fopen(filename, "rb");
 378         if (fp == NULL)
 379                 return NULL;
 380
 381         if (fread(header, sizeof header, 1, fp) != 1) {
 382                 fclose(fp);
 383                 return NULL;
 384         }
 385
 386         rewind(fp);
 387         for (i = 0; i < ARRAY_LENGTH(loaders); i++) {
 388                 if (memcmp(header, loaders[i].header,
 389                            loaders[i].header_size) == 0) {
 390                         image = loaders[i].load(fp);
 391                         break;
 392                 }
 393         }
 394
 395         fclose(fp);
 396
 397         if (i == ARRAY_LENGTH(loaders)) {
 398                 fprintf(stderr, "unrecognized file header for %s: "
 399                         "0x%02x 0x%02x 0x%02x 0x%02x\n",
 400                         filename, header[0], header[1], header[2], header[3]);
 401                 image = NULL;
 402         }
 403
 404         return image;
 405 }