2 * Copyright (C) 1999 Michael Zucchi
3 * Copyright (C) 1999 The Free Software Foundation
4 * Copyright (C) 2004 John Ellis
5 * Copyright (C) 2008 - 2016 The Geeqie Team
7 * Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
8 * Federico Mena-Quintero <federico@gimp.org>
9 * Michael Fulbright <drmike@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 /** This is a Will Not Fix */
28 #pragma GCC diagnostic ignored "-Wclobbered"
34 #include "image-load-jpeg.h"
37 #include <cstdio> // for FILE and size_t in jpeglib.h
39 #include <gdk-pixbuf/gdk-pixbuf.h>
40 #include <glib-object.h>
46 #include "image-load.h"
48 #include "jpeg-parser.h"
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,
83 g_return_if_fail (cinfo != nullptr);
84 g_return_if_fail (cinfo->output_components == 1);
85 g_return_if_fail (cinfo->out_color_space == JCS_GRAYSCALE);
87 /* Expand grey->colour. Expand from the end of the
88 * memory down, so we can use the same buffer.
90 w = cinfo->output_width;
91 for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
95 from = lines[i] + w - 1;
96 to = lines[i] + (w - 1) * 3;
97 for (j = w - 1; j >= 0; j--) {
109 convert_cmyk_to_rgb (struct jpeg_decompress_struct *cinfo,
115 g_return_if_fail (cinfo != nullptr);
116 g_return_if_fail (cinfo->output_components == 4);
117 g_return_if_fail (cinfo->out_color_space == JCS_CMYK);
119 for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
123 for (j = 0; j < cinfo->output_width; j++) {
132 if (cinfo->saw_Adobe_marker) {
138 p[0] = (255 - k)*(255 - c) / 255;
139 p[1] = (255 - k)*(255 - m) / 255;
140 p[2] = (255 - k)*(255 - y) / 255;
149 static gpointer image_loader_jpeg_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
151 auto loader = g_new0(ImageLoaderJpeg, 1);
153 loader->area_updated_cb = area_updated_cb;
154 loader->size_cb = size_cb;
155 loader->area_prepared_cb = area_prepared_cb;
161 fatal_error_handler (j_common_ptr cinfo)
163 struct error_handler_data *errmgr;
164 char buffer[JMSG_LENGTH_MAX];
166 errmgr = reinterpret_cast<struct error_handler_data *>(cinfo->err);
168 /* Create the message */
169 (* cinfo->err->format_message) (cinfo, buffer);
171 /* broken check for *error == NULL for robustness against
172 * crappy JPEG library
174 if (errmgr->error && *errmgr->error == nullptr) {
175 g_set_error (errmgr->error,
177 cinfo->err->msg_code == JERR_OUT_OF_MEMORY
178 ? GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY
179 : GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
180 _("Error interpreting JPEG image file (%s)"),
184 siglongjmp (errmgr->setjmp_buffer, 1);
186 g_assert_not_reached ();
190 output_message_handler (j_common_ptr)
192 /* This method keeps libjpeg from dumping crap to stderr */
198 void image_loader_jpeg_read_scanline(struct jpeg_decompress_struct *cinfo, guchar **dptr, guint rowstride)
205 for (i = 0; i < cinfo->rec_outbuf_height; i++)
211 jpeg_read_scanlines (cinfo, lines, cinfo->rec_outbuf_height);
213 switch (cinfo->out_color_space)
216 explode_gray_into_buf (cinfo, lines);
222 convert_cmyk_to_rgb (cinfo, lines);
230 static void init_source (j_decompress_ptr) {}
231 static boolean fill_input_buffer (j_decompress_ptr cinfo)
233 ERREXIT(cinfo, JERR_INPUT_EMPTY);
236 static void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
238 auto src = static_cast<struct jpeg_source_mgr*>(cinfo->src);
240 if (static_cast<gulong>(num_bytes) > src->bytes_in_buffer)
242 ERREXIT(cinfo, JERR_INPUT_EOF);
244 else if (num_bytes > 0)
246 src->next_input_byte += static_cast<size_t>(num_bytes);
247 src->bytes_in_buffer -= static_cast<size_t>(num_bytes);
250 static void term_source (j_decompress_ptr) {}
251 static void set_mem_src (j_decompress_ptr cinfo, void* buffer, long nbytes)
253 struct jpeg_source_mgr* src;
255 if (cinfo->src == nullptr)
256 { /* first time for this JPEG object? */
257 cinfo->src = static_cast<struct jpeg_source_mgr *>((*cinfo->mem->alloc_small) (
258 reinterpret_cast<j_common_ptr>(cinfo), JPOOL_PERMANENT,
259 sizeof(struct jpeg_source_mgr)));
262 src = static_cast<struct jpeg_source_mgr*>(cinfo->src);
263 src->init_source = init_source;
264 src->fill_input_buffer = fill_input_buffer;
265 src->skip_input_data = skip_input_data;
266 src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
267 src->term_source = term_source;
268 src->bytes_in_buffer = nbytes;
269 src->next_input_byte = static_cast<JOCTET*>(buffer);
273 static gboolean image_loader_jpeg_load (gpointer loader, const guchar *buf, gsize count, GError **error)
275 auto lj = static_cast<ImageLoaderJpeg *>(loader);
276 struct jpeg_decompress_struct cinfo;
277 struct jpeg_decompress_struct cinfo2;
281 guchar *stereo_buf2 = nullptr;
282 guint stereo_length = 0;
284 struct error_handler_data jerr;
288 MPOData *mpo = jpeg_get_mpo_data(buf, count);
289 if (mpo && mpo->num_images > 1)
296 for (i = 0; i < mpo->num_images; i++)
298 if (mpo->images[i].type_code == 0x20002)
300 if (mpo->images[i].MPIndividualNum == 1)
304 else if (mpo->images[i].MPIndividualNum > num2)
307 num2 = mpo->images[i].MPIndividualNum;
312 if (idx1 >= 0 && idx2 >= 0)
315 stereo_buf2 = const_cast<unsigned char *>(buf) + mpo->images[idx2].offset;
316 stereo_length = mpo->images[idx2].length;
317 buf = const_cast<unsigned char *>(buf) + mpo->images[idx1].offset;
318 count = mpo->images[idx1].length;
321 jpeg_mpo_data_free(mpo);
323 /* setup error handler */
324 cinfo.err = jpeg_std_error (&jerr.pub);
325 if (lj->stereo) cinfo2.err = jpeg_std_error (&jerr.pub);
326 jerr.pub.error_exit = fatal_error_handler;
327 jerr.pub.output_message = output_message_handler;
332 if (sigsetjmp(jerr.setjmp_buffer, 0))
334 /* If we get here, the JPEG code has signaled an error.
335 * We need to clean up the JPEG object, close the input file, and return.
337 jpeg_destroy_decompress(&cinfo);
338 if (lj->stereo) jpeg_destroy_decompress(&cinfo2);
342 jpeg_create_decompress(&cinfo);
344 set_mem_src(&cinfo, const_cast<unsigned char *>(buf), count);
347 jpeg_read_header(&cinfo, TRUE);
351 jpeg_create_decompress(&cinfo2);
352 set_mem_src(&cinfo2, stereo_buf2, stereo_length);
353 jpeg_read_header(&cinfo2, TRUE);
355 if (cinfo.image_width != cinfo2.image_width ||
356 cinfo.image_height != cinfo2.image_height)
358 DEBUG_1("stereo data with different size");
359 jpeg_destroy_decompress(&cinfo2);
366 lj->requested_width = lj->stereo ? cinfo.image_width * 2: cinfo.image_width;
367 lj->requested_height = cinfo.image_height;
368 lj->size_cb(loader, lj->requested_width, lj->requested_height, lj->data);
371 for (cinfo.scale_denom = 2; cinfo.scale_denom <= 8; cinfo.scale_denom *= 2) {
372 jpeg_calc_output_dimensions(&cinfo);
373 if (cinfo.output_width < (lj->stereo ? lj->requested_width / 2 : lj->requested_width) || cinfo.output_height < lj->requested_height) {
374 cinfo.scale_denom /= 2;
378 jpeg_calc_output_dimensions(&cinfo);
381 cinfo2.scale_num = cinfo.scale_num;
382 cinfo2.scale_denom = cinfo.scale_denom;
383 jpeg_calc_output_dimensions(&cinfo2);
384 jpeg_start_decompress(&cinfo2);
388 jpeg_start_decompress(&cinfo);
393 if (cinfo.output_width != cinfo2.output_width ||
394 cinfo.output_height != cinfo2.output_height ||
395 cinfo.out_color_components != cinfo2.out_color_components)
397 DEBUG_1("stereo data with different output size");
398 jpeg_destroy_decompress(&cinfo2);
404 lj->pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
405 cinfo.out_color_components == 4 ? TRUE : FALSE,
406 8, lj->stereo ? cinfo.output_width * 2: cinfo.output_width, cinfo.output_height);
410 jpeg_destroy_decompress (&cinfo);
411 if (lj->stereo) jpeg_destroy_decompress (&cinfo2);
414 if (lj->stereo) g_object_set_data(G_OBJECT(lj->pixbuf), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
415 lj->area_prepared_cb(loader, lj->data);
417 rowstride = gdk_pixbuf_get_rowstride(lj->pixbuf);
418 dptr = gdk_pixbuf_get_pixels(lj->pixbuf);
419 dptr2 = gdk_pixbuf_get_pixels(lj->pixbuf) + ((cinfo.out_color_components == 4) ? 4 * cinfo.output_width : 3 * cinfo.output_width);
422 while (cinfo.output_scanline < cinfo.output_height && !lj->abort)
424 guint scanline = cinfo.output_scanline;
425 image_loader_jpeg_read_scanline(&cinfo, &dptr, rowstride);
426 lj->area_updated_cb(loader, 0, scanline, cinfo.output_width, cinfo.rec_outbuf_height, lj->data);
429 guint scanline = cinfo2.output_scanline;
430 image_loader_jpeg_read_scanline(&cinfo2, &dptr2, rowstride);
431 lj->area_updated_cb(loader, cinfo.output_width, scanline, cinfo2.output_width, cinfo2.rec_outbuf_height, lj->data);
435 jpeg_finish_decompress(&cinfo);
436 jpeg_destroy_decompress(&cinfo);
439 jpeg_finish_decompress(&cinfo);
440 jpeg_destroy_decompress(&cinfo);
446 static void image_loader_jpeg_set_size(gpointer loader, int width, int height)
448 auto lj = static_cast<ImageLoaderJpeg *>(loader);
449 lj->requested_width = width;
450 lj->requested_height = height;
453 static GdkPixbuf* image_loader_jpeg_get_pixbuf(gpointer loader)
455 auto lj = static_cast<ImageLoaderJpeg *>(loader);
459 static gchar* image_loader_jpeg_get_format_name(gpointer)
461 return g_strdup("jpeg");
463 static gchar** image_loader_jpeg_get_format_mime_types(gpointer)
465 static const gchar *mime[] = {"image/jpeg", nullptr};
466 return g_strdupv(const_cast<gchar **>(mime));
469 static gboolean image_loader_jpeg_close(gpointer, GError **)
474 static void image_loader_jpeg_abort(gpointer loader)
476 auto lj = static_cast<ImageLoaderJpeg *>(loader);
480 static void image_loader_jpeg_free(gpointer loader)
482 auto lj = static_cast<ImageLoaderJpeg *>(loader);
483 if (lj->pixbuf) g_object_unref(lj->pixbuf);
488 void image_loader_backend_set_jpeg(ImageLoaderBackend *funcs)
490 funcs->loader_new = image_loader_jpeg_new;
491 funcs->set_size = image_loader_jpeg_set_size;
492 funcs->load = image_loader_jpeg_load;
493 funcs->write = nullptr;
494 funcs->get_pixbuf = image_loader_jpeg_get_pixbuf;
495 funcs->close = image_loader_jpeg_close;
496 funcs->abort = image_loader_jpeg_abort;
497 funcs->free = image_loader_jpeg_free;
499 funcs->get_format_name = image_loader_jpeg_get_format_name;
500 funcs->get_format_mime_types = image_loader_jpeg_get_format_mime_types;
506 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */