1 | /* GDK - The GIMP Drawing Kit |
2 | * Copyright (C) 2021 Red Hat, Inc. |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2 of the License, or (at your option) any later version. |
8 | * |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library. If not, see <http://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include <stdlib.h> |
19 | |
20 | #include "config.h" |
21 | |
22 | #include "gdkjpegprivate.h" |
23 | |
24 | #include "gdkintl.h" |
25 | #include "gdktexture.h" |
26 | #include "gdkmemorytextureprivate.h" |
27 | |
28 | #include "gdkprofilerprivate.h" |
29 | |
30 | #include <jpeglib.h> |
31 | #include <jerror.h> |
32 | #include <setjmp.h> |
33 | |
34 | /* {{{ Error handling */ |
35 | |
36 | /* No sigsetjmp on Windows */ |
37 | #ifndef HAVE_SIGSETJMP |
38 | #define sigjmp_buf jmp_buf |
39 | #define sigsetjmp(jb, x) setjmp(jb) |
40 | #define siglongjmp longjmp |
41 | #endif |
42 | |
43 | struct error_handler_data { |
44 | struct jpeg_error_mgr pub; |
45 | sigjmp_buf setjmp_buffer; |
46 | GError **error; |
47 | }; |
48 | |
49 | G_GNUC_NORETURN static void |
50 | fatal_error_handler (j_common_ptr cinfo) |
51 | { |
52 | struct error_handler_data *errmgr; |
53 | char buffer[JMSG_LENGTH_MAX]; |
54 | |
55 | errmgr = (struct error_handler_data *) cinfo->err; |
56 | |
57 | cinfo->err->format_message (cinfo, buffer); |
58 | |
59 | if (errmgr->error && *errmgr->error == NULL) |
60 | g_set_error (err: errmgr->error, |
61 | GDK_TEXTURE_ERROR, |
62 | code: GDK_TEXTURE_ERROR_CORRUPT_IMAGE, |
63 | _("Error interpreting JPEG image file (%s)" ), buffer); |
64 | |
65 | siglongjmp (env: errmgr->setjmp_buffer, val: 1); |
66 | |
67 | g_assert_not_reached (); |
68 | } |
69 | |
70 | static void |
71 | output_message_handler (j_common_ptr cinfo) |
72 | { |
73 | /* do nothing */ |
74 | } |
75 | |
76 | /* }}} */ |
77 | /* {{{ Format conversion */ |
78 | |
79 | static void |
80 | convert_grayscale_to_rgb (guchar *data, |
81 | int width, |
82 | int height, |
83 | int stride) |
84 | { |
85 | gsize x, y; |
86 | guchar *dest, *src; |
87 | |
88 | for (y = 0; y < height; y++) |
89 | { |
90 | src = data + width; |
91 | dest = data + 3 * width; |
92 | for (x = 0; x < width; x++) |
93 | { |
94 | dest -= 3; |
95 | src -= 1; |
96 | dest[0] = *src; |
97 | dest[1] = *src; |
98 | dest[2] = *src; |
99 | } |
100 | data += stride; |
101 | } |
102 | } |
103 | |
104 | static void |
105 | convert_cmyk_to_rgba (guchar *data, |
106 | int width, |
107 | int height, |
108 | int stride) |
109 | { |
110 | gsize x, r; |
111 | guchar *dest; |
112 | |
113 | for (r = 0; r < height; r++) |
114 | { |
115 | dest = data; |
116 | for (x = 0; x < width; x++) |
117 | { |
118 | int c, m, y, k; |
119 | |
120 | c = dest[0]; |
121 | m = dest[1]; |
122 | y = dest[2]; |
123 | k = dest[3]; |
124 | dest[0] = k * c / 255; |
125 | dest[1] = k * m / 255; |
126 | dest[2] = k * y / 255; |
127 | dest[3] = 255; |
128 | dest += 4; |
129 | } |
130 | data += stride; |
131 | } |
132 | } |
133 | |
134 | /* }}} */ |
135 | /* {{{ Public API */ |
136 | |
137 | GdkTexture * |
138 | gdk_load_jpeg (GBytes *input_bytes, |
139 | GError **error) |
140 | { |
141 | struct jpeg_decompress_struct info; |
142 | struct error_handler_data jerr; |
143 | guint width, height, stride; |
144 | unsigned char *data; |
145 | unsigned char *row[1]; |
146 | GBytes *bytes; |
147 | GdkTexture *texture; |
148 | GdkMemoryFormat format; |
149 | G_GNUC_UNUSED guint64 before = GDK_PROFILER_CURRENT_TIME; |
150 | |
151 | info.err = jpeg_std_error (err: &jerr.pub); |
152 | jerr.pub.error_exit = fatal_error_handler; |
153 | jerr.pub.output_message = output_message_handler; |
154 | jerr.error = error; |
155 | |
156 | if (sigsetjmp (jerr.setjmp_buffer, 1)) |
157 | { |
158 | jpeg_destroy_decompress (cinfo: &info); |
159 | return NULL; |
160 | } |
161 | |
162 | jpeg_create_decompress (&info); |
163 | |
164 | jpeg_mem_src (cinfo: &info, |
165 | inbuffer: g_bytes_get_data (bytes: input_bytes, NULL), |
166 | insize: g_bytes_get_size (bytes: input_bytes)); |
167 | |
168 | jpeg_read_header (cinfo: &info, TRUE); |
169 | jpeg_start_decompress (cinfo: &info); |
170 | |
171 | width = info.output_width; |
172 | height = info.output_height; |
173 | |
174 | switch ((int)info.out_color_space) |
175 | { |
176 | case JCS_GRAYSCALE: |
177 | case JCS_RGB: |
178 | stride = 3 * width; |
179 | data = g_try_malloc_n (n_blocks: stride, n_block_bytes: height); |
180 | format = GDK_MEMORY_R8G8B8; |
181 | break; |
182 | case JCS_CMYK: |
183 | stride = 4 * width; |
184 | data = g_try_malloc_n (n_blocks: stride, n_block_bytes: height); |
185 | format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED; |
186 | break; |
187 | default: |
188 | g_set_error (err: error, |
189 | GDK_TEXTURE_ERROR, code: GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT, |
190 | _("Unsupported JPEG colorspace (%d)" ), info.out_color_space); |
191 | jpeg_destroy_decompress (cinfo: &info); |
192 | return NULL; |
193 | } |
194 | |
195 | if (!data) |
196 | { |
197 | g_set_error (err: error, |
198 | GDK_TEXTURE_ERROR, code: GDK_TEXTURE_ERROR_TOO_LARGE, |
199 | _("Not enough memory for image size %ux%u" ), width, height); |
200 | jpeg_destroy_decompress (cinfo: &info); |
201 | return NULL; |
202 | } |
203 | |
204 | while (info.output_scanline < info.output_height) |
205 | { |
206 | row[0] = (unsigned char *)(&data[stride * info.output_scanline]); |
207 | jpeg_read_scanlines (cinfo: &info, scanlines: row, max_lines: 1); |
208 | } |
209 | |
210 | switch ((int)info.out_color_space) |
211 | { |
212 | case JCS_GRAYSCALE: |
213 | convert_grayscale_to_rgb (data, width, height, stride); |
214 | format = GDK_MEMORY_R8G8B8; |
215 | break; |
216 | case JCS_RGB: |
217 | break; |
218 | case JCS_CMYK: |
219 | convert_cmyk_to_rgba (data, width, height, stride); |
220 | break; |
221 | default: |
222 | g_assert_not_reached (); |
223 | } |
224 | |
225 | jpeg_finish_decompress (cinfo: &info); |
226 | jpeg_destroy_decompress (cinfo: &info); |
227 | |
228 | bytes = g_bytes_new_take (data, size: stride * height); |
229 | |
230 | texture = gdk_memory_texture_new (width, height, |
231 | format, |
232 | bytes, stride); |
233 | |
234 | g_bytes_unref (bytes); |
235 | |
236 | gdk_profiler_end_mark (before, "jpeg load" , NULL); |
237 | |
238 | return texture; |
239 | } |
240 | |
241 | GBytes * |
242 | gdk_save_jpeg (GdkTexture *texture) |
243 | { |
244 | struct jpeg_compress_struct info; |
245 | struct error_handler_data jerr; |
246 | struct jpeg_error_mgr err; |
247 | guchar *data; |
248 | gulong size = 0; |
249 | guchar *input = NULL; |
250 | GdkMemoryTexture *memtex = NULL; |
251 | const guchar *texdata; |
252 | gsize texstride; |
253 | guchar *row; |
254 | int width, height; |
255 | |
256 | width = gdk_texture_get_width (texture); |
257 | height = gdk_texture_get_height (texture); |
258 | |
259 | info.err = jpeg_std_error (err: &jerr.pub); |
260 | jerr.pub.error_exit = fatal_error_handler; |
261 | jerr.pub.output_message = output_message_handler; |
262 | jerr.error = NULL; |
263 | |
264 | if (sigsetjmp (jerr.setjmp_buffer, 1)) |
265 | { |
266 | free (ptr: data); |
267 | g_free (mem: input); |
268 | jpeg_destroy_compress (cinfo: &info); |
269 | g_clear_object (&memtex); |
270 | return NULL; |
271 | } |
272 | |
273 | info.err = jpeg_std_error (err: &err); |
274 | jpeg_create_compress (&info); |
275 | info.image_width = width; |
276 | info.image_height = height; |
277 | info.input_components = 3; |
278 | info.in_color_space = JCS_RGB; |
279 | |
280 | jpeg_set_defaults (cinfo: &info); |
281 | jpeg_set_quality (cinfo: &info, quality: 75, TRUE); |
282 | |
283 | jpeg_mem_dest (cinfo: &info, outbuffer: &data, outsize: &size); |
284 | |
285 | memtex = gdk_memory_texture_from_texture (texture, |
286 | format: GDK_MEMORY_R8G8B8); |
287 | texdata = gdk_memory_texture_get_data (self: memtex); |
288 | texstride = gdk_memory_texture_get_stride (self: memtex); |
289 | |
290 | jpeg_start_compress (cinfo: &info, TRUE); |
291 | |
292 | while (info.next_scanline < info.image_height) |
293 | { |
294 | row = (guchar *) texdata + info.next_scanline * texstride; |
295 | jpeg_write_scanlines (cinfo: &info, scanlines: &row, num_lines: 1); |
296 | } |
297 | |
298 | jpeg_finish_compress (cinfo: &info); |
299 | |
300 | g_object_unref (object: memtex); |
301 | g_free (mem: input); |
302 | jpeg_destroy_compress (cinfo: &info); |
303 | |
304 | return g_bytes_new_with_free_func (data, size, free_func: (GDestroyNotify) free, NULL); |
305 | } |
306 | |
307 | /* }}} */ |
308 | |
309 | /* vim:set foldmethod=marker expandtab: */ |
310 | |