4 * Copyright (C) 2008 - 2011 The Geeqie Team
6 * Author: Vladimir Nadvornik
8 * This software is released under the GNU General Public License (GNU GPL).
9 * Please read the included file COPYING for more information.
10 * This software comes with no warranty of any kind, use at your own risk!
13 /* based on code from GdkPixbuf library - JPEG image loader
15 * Copyright (C) 1999 Michael Zucchi
16 * Copyright (C) 1999 The Free Software Foundation
18 * Progressive loading code Copyright (C) 1999 Red Hat, Inc.
20 * Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
21 * Federico Mena-Quintero <federico@gimp.org>
22 * Michael Fulbright <drmike@redhat.com>
24 * This library is free software; you can redistribute it and/or
25 * modify it under the terms of the GNU Lesser General Public
26 * License as published by the Free Software Foundation; either
27 * version 2 of the License, or (at your option) any later version.
29 * This library is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32 * Lesser General Public License for more details.
34 * You should have received a copy of the GNU Lesser General Public
35 * License along with this library; if not, write to the
36 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
37 * Boston, MA 02111-1307, USA.
42 #include "image-load.h"
43 #include "image_load_jpeg.h"
44 #include "jpeg_parser.h"
50 typedef struct _ImageLoaderJpeg ImageLoaderJpeg;
51 struct _ImageLoaderJpeg {
52 ImageLoaderBackendCbAreaUpdated area_updated_cb;
53 ImageLoaderBackendCbSize size_cb;
54 ImageLoaderBackendCbAreaPrepared area_prepared_cb;
59 guint requested_width;
60 guint requested_height;
67 /* error handler data */
68 struct error_handler_data {
69 struct jpeg_error_mgr pub;
70 sigjmp_buf setjmp_buffer;
74 /* explode gray image data from jpeg library into rgb components in pixbuf */
76 explode_gray_into_buf (struct jpeg_decompress_struct *cinfo,
82 g_return_if_fail (cinfo != NULL);
83 g_return_if_fail (cinfo->output_components == 1);
84 g_return_if_fail (cinfo->out_color_space == JCS_GRAYSCALE);
86 /* Expand grey->colour. Expand from the end of the
87 * memory down, so we can use the same buffer.
89 w = cinfo->output_width;
90 for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
93 from = lines[i] + w - 1;
94 to = lines[i] + (w - 1) * 3;
95 for (j = w - 1; j >= 0; j--) {
107 convert_cmyk_to_rgb (struct jpeg_decompress_struct *cinfo,
112 g_return_if_fail (cinfo != NULL);
113 g_return_if_fail (cinfo->output_components == 4);
114 g_return_if_fail (cinfo->out_color_space == JCS_CMYK);
116 for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
120 for (j = 0; j < cinfo->output_width; j++) {
126 if (cinfo->saw_Adobe_marker) {
132 p[0] = (255 - k)*(255 - c) / 255;
133 p[1] = (255 - k)*(255 - m) / 255;
134 p[2] = (255 - k)*(255 - y) / 255;
143 static gpointer image_loader_jpeg_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
145 ImageLoaderJpeg *loader = g_new0(ImageLoaderJpeg, 1);
147 loader->area_updated_cb = area_updated_cb;
148 loader->size_cb = size_cb;
149 loader->area_prepared_cb = area_prepared_cb;
151 return (gpointer) loader;
155 fatal_error_handler (j_common_ptr cinfo)
157 struct error_handler_data *errmgr;
158 char buffer[JMSG_LENGTH_MAX];
160 errmgr = (struct error_handler_data *) cinfo->err;
162 /* Create the message */
163 (* cinfo->err->format_message) (cinfo, buffer);
165 /* broken check for *error == NULL for robustness against
166 * crappy JPEG library
168 if (errmgr->error && *errmgr->error == NULL) {
169 g_set_error (errmgr->error,
171 cinfo->err->msg_code == JERR_OUT_OF_MEMORY
172 ? GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY
173 : GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
174 _("Error interpreting JPEG image file (%s)"),
178 siglongjmp (errmgr->setjmp_buffer, 1);
180 g_assert_not_reached ();
184 output_message_handler (j_common_ptr cinfo)
186 /* This method keeps libjpeg from dumping crap to stderr */
192 void image_loader_jpeg_read_scanline(struct jpeg_decompress_struct *cinfo, guchar **dptr, guint rowstride)
199 for (i = 0; i < cinfo->rec_outbuf_height; i++)
205 jpeg_read_scanlines (cinfo, lines, cinfo->rec_outbuf_height);
207 switch (cinfo->out_color_space)
210 explode_gray_into_buf (cinfo, lines);
216 convert_cmyk_to_rgb (cinfo, lines);
224 static void init_source (j_decompress_ptr cinfo) {}
225 static boolean fill_input_buffer (j_decompress_ptr cinfo)
227 ERREXIT(cinfo, JERR_INPUT_EMPTY);
229 static void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
231 struct jpeg_source_mgr* src = (struct jpeg_source_mgr*) cinfo->src;
235 src->next_input_byte += (size_t) num_bytes;
236 src->bytes_in_buffer -= (size_t) num_bytes;
239 static void term_source (j_decompress_ptr cinfo) {}
240 static void set_mem_src (j_decompress_ptr cinfo, void* buffer, long nbytes)
242 struct jpeg_source_mgr* src;
244 if (cinfo->src == NULL)
245 { /* first time for this JPEG object? */
246 cinfo->src = (struct jpeg_source_mgr *) (*cinfo->mem->alloc_small) (
247 (j_common_ptr) cinfo, JPOOL_PERMANENT,
248 sizeof(struct jpeg_source_mgr));
251 src = (struct jpeg_source_mgr*) cinfo->src;
252 src->init_source = init_source;
253 src->fill_input_buffer = fill_input_buffer;
254 src->skip_input_data = skip_input_data;
255 src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
256 src->term_source = term_source;
257 src->bytes_in_buffer = nbytes;
258 src->next_input_byte = (JOCTET*)buffer;
262 static gboolean image_loader_jpeg_load (gpointer loader, const guchar *buf, gsize count, GError **error)
264 ImageLoaderJpeg *lj = (ImageLoaderJpeg *) loader;
265 struct jpeg_decompress_struct cinfo;
266 struct jpeg_decompress_struct cinfo2;
267 guchar *dptr, *dptr2;
269 guchar *stereo_buf2 = NULL;
270 guint stereo_length = 0;
272 struct error_handler_data jerr;
276 MPOData *mpo = jpeg_get_mpo_data(buf, count);
277 if (mpo && mpo->num_images > 1)
280 gint idx1 = -1, idx2 = -1;
283 for (i = 0; i < mpo->num_images; i++)
285 if (mpo->images[i].type_code == 0x20002)
287 if (mpo->images[i].MPIndividualNum == 1)
291 else if (mpo->images[i].MPIndividualNum > num2)
294 num2 = mpo->images[i].MPIndividualNum;
299 if (idx1 >= 0 && idx2 >= 0)
302 stereo_buf2 = (unsigned char *)buf + mpo->images[idx2].offset;
303 stereo_length = mpo->images[idx2].length;
304 buf = (unsigned char *)buf + mpo->images[idx1].offset;
305 count = mpo->images[idx1].length;
308 jpeg_mpo_data_free(mpo);
310 /* setup error handler */
311 cinfo.err = jpeg_std_error (&jerr.pub);
312 if (lj->stereo) cinfo2.err = jpeg_std_error (&jerr.pub);
313 jerr.pub.error_exit = fatal_error_handler;
314 jerr.pub.output_message = output_message_handler;
319 if (setjmp(jerr.setjmp_buffer))
321 /* If we get here, the JPEG code has signaled an error.
322 * We need to clean up the JPEG object, close the input file, and return.
324 jpeg_destroy_decompress(&cinfo);
325 if (lj->stereo) jpeg_destroy_decompress(&cinfo2);
329 jpeg_create_decompress(&cinfo);
331 set_mem_src(&cinfo, (unsigned char *)buf, count);
334 jpeg_read_header(&cinfo, TRUE);
338 jpeg_create_decompress(&cinfo2);
339 set_mem_src(&cinfo2, stereo_buf2, stereo_length);
340 jpeg_read_header(&cinfo2, TRUE);
342 if (cinfo.image_width != cinfo2.image_width ||
343 cinfo.image_height != cinfo2.image_height)
345 DEBUG_1("stereo data with different size");
346 jpeg_destroy_decompress(&cinfo2);
353 lj->requested_width = lj->stereo ? cinfo.image_width * 2: cinfo.image_width;
354 lj->requested_height = cinfo.image_height;
355 lj->size_cb(loader, lj->requested_width, lj->requested_height, lj->data);
358 for (cinfo.scale_denom = 2; cinfo.scale_denom <= 8; cinfo.scale_denom *= 2) {
359 jpeg_calc_output_dimensions(&cinfo);
360 if (cinfo.output_width < (lj->stereo ? lj->requested_width / 2 : lj->requested_width) || cinfo.output_height < lj->requested_height) {
361 cinfo.scale_denom /= 2;
365 jpeg_calc_output_dimensions(&cinfo);
368 cinfo2.scale_num = cinfo.scale_num;
369 cinfo2.scale_denom = cinfo.scale_denom;
370 jpeg_calc_output_dimensions(&cinfo2);
371 jpeg_start_decompress(&cinfo2);
375 jpeg_start_decompress(&cinfo);
380 if (cinfo.output_width != cinfo2.output_width ||
381 cinfo.output_height != cinfo2.output_height ||
382 cinfo.out_color_components != cinfo2.out_color_components)
384 DEBUG_1("stereo data with different output size");
385 jpeg_destroy_decompress(&cinfo2);
391 lj->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
392 cinfo.out_color_components == 4 ? TRUE : FALSE,
393 8, lj->stereo ? cinfo.output_width * 2: cinfo.output_width, cinfo.output_height);
397 jpeg_destroy_decompress (&cinfo);
398 if (lj->stereo) jpeg_destroy_decompress (&cinfo2);
401 if (lj->stereo) g_object_set_data(G_OBJECT(lj->pixbuf), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
402 lj->area_prepared_cb(loader, lj->data);
404 rowstride = gdk_pixbuf_get_rowstride(lj->pixbuf);
405 dptr = gdk_pixbuf_get_pixels(lj->pixbuf);
406 dptr2 = gdk_pixbuf_get_pixels(lj->pixbuf) + ((cinfo.out_color_components == 4) ? 4 * cinfo.output_width : 3 * cinfo.output_width);
409 while (cinfo.output_scanline < cinfo.output_height && !lj->abort)
411 guint scanline = cinfo.output_scanline;
412 image_loader_jpeg_read_scanline(&cinfo, &dptr, rowstride);
413 lj->area_updated_cb(loader, 0, scanline, cinfo.output_width, cinfo.rec_outbuf_height, lj->data);
416 guint scanline = cinfo2.output_scanline;
417 image_loader_jpeg_read_scanline(&cinfo2, &dptr2, rowstride);
418 lj->area_updated_cb(loader, cinfo.output_width, scanline, cinfo2.output_width, cinfo2.rec_outbuf_height, lj->data);
422 jpeg_finish_decompress(&cinfo);
423 jpeg_destroy_decompress(&cinfo);
426 jpeg_finish_decompress(&cinfo);
427 jpeg_destroy_decompress(&cinfo);
433 static void image_loader_jpeg_set_size(gpointer loader, int width, int height)
435 ImageLoaderJpeg *lj = (ImageLoaderJpeg *) loader;
436 lj->requested_width = width;
437 lj->requested_height = height;
440 static GdkPixbuf* image_loader_jpeg_get_pixbuf(gpointer loader)
442 ImageLoaderJpeg *lj = (ImageLoaderJpeg *) loader;
446 static gchar* image_loader_jpeg_get_format_name(gpointer loader)
448 return g_strdup("jpeg");
450 static gchar** image_loader_jpeg_get_format_mime_types(gpointer loader)
452 static gchar *mime[] = {"image/jpeg", NULL};
453 return g_strdupv(mime);
456 static gboolean image_loader_jpeg_close(gpointer loader, GError **error)
461 static void image_loader_jpeg_abort(gpointer loader)
463 ImageLoaderJpeg *lj = (ImageLoaderJpeg *) loader;
467 static void image_loader_jpeg_free(gpointer loader)
469 ImageLoaderJpeg *lj = (ImageLoaderJpeg *) loader;
470 if (lj->pixbuf) g_object_unref(lj->pixbuf);
475 void image_loader_backend_set_jpeg(ImageLoaderBackend *funcs)
477 funcs->loader_new = image_loader_jpeg_new;
478 funcs->set_size = image_loader_jpeg_set_size;
479 funcs->load = image_loader_jpeg_load;
481 funcs->get_pixbuf = image_loader_jpeg_get_pixbuf;
482 funcs->close = image_loader_jpeg_close;
483 funcs->abort = image_loader_jpeg_abort;
484 funcs->free = image_loader_jpeg_free;
486 funcs->get_format_name = image_loader_jpeg_get_format_name;
487 funcs->get_format_mime_types = image_loader_jpeg_get_format_mime_types;