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nsxivimage.c

346 lines · 7.0 KB · C

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1/* sxiv: image.c
2 * Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program 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
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#include <unistd.h>
20#include <Imlib2.h>
21
22#include "config.h"
23#include "icon.h"
24#include "image.h"
25#include "options.h"
26#include "util.h"
27
28int zl_cnt;
29float zoom_min;
30float zoom_max;
31
32Imlib_Image *im_broken;
33
34void img_init(img_t *img, win_t *win) {
35 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
36 zoom_min = zoom_levels[0] / 100.0;
37 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
38
39 im_broken = imlib_create_image_using_data(32, 32, icon_broken);
40
41 if (img) {
42 img->zoom = options->zoom;
43 img->zoom = MAX(img->zoom, zoom_min);
44 img->zoom = MIN(img->zoom, zoom_max);
45 img->aa = options->aa;
46 }
47
48 if (win) {
49 imlib_context_set_display(win->env.dpy);
50 imlib_context_set_visual(win->env.vis);
51 imlib_context_set_colormap(win->env.cmap);
52 }
53}
54
55void img_free(img_t* img) {
56 if (img && img->valid && imlib_context_get_image())
57 imlib_free_image();
58 imlib_context_set_image(im_broken);
59 imlib_free_image();
60}
61
62int _imlib_load_image(const char *filename) {
63 Imlib_Image *im;
64
65 if (!filename)
66 return 0;
67
68 if (access(filename, F_OK) || !(im = imlib_load_image(filename))) {
69 warn("could not open file: %s", filename);
70 return 0;
71 }
72
73 imlib_context_set_image(im);
74 imlib_image_set_changes_on_disk();
75
76 return 1;
77}
78
79int img_check(const char *filename) {
80 int ret;
81
82 if ((ret = _imlib_load_image(filename)))
83 imlib_free_image();
84 return ret;
85}
86
87int img_load(img_t *img, const char *filename) {
88 if (!img || !filename)
89 return 0;
90
91 if (img->valid && imlib_context_get_image())
92 imlib_free_image();
93
94 if ((img->valid = _imlib_load_image(filename))) {
95 imlib_context_set_anti_alias(img->aa);
96 img->scalemode = options->scalemode;
97 } else {
98 imlib_context_set_image(im_broken);
99 imlib_context_set_anti_alias(0);
100 img->scalemode = SCALE_DOWN;
101 }
102
103 img->re = 0;
104 img->checkpan = 0;
105
106 img->w = imlib_image_get_width();
107 img->h = imlib_image_get_height();
108
109 return 1;
110}
111
112void img_check_pan(img_t *img, win_t *win) {
113 if (!img || !win)
114 return;
115
116 if (img->w * img->zoom > win->w) {
117 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
118 img->x = 0;
119 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
120 img->x = win->w - img->w * img->zoom;
121 } else {
122 img->x = (win->w - img->w * img->zoom) / 2;
123 }
124 if (img->h * img->zoom > win->h) {
125 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
126 img->y = 0;
127 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
128 img->y = win->h - img->h * img->zoom;
129 } else {
130 img->y = (win->h - img->h * img->zoom) / 2;
131 }
132}
133
134int img_fit(img_t *img, win_t *win) {
135 float oz, zw, zh;
136
137 if (!img || !win)
138 return 0;
139
140 oz = img->zoom;
141 zw = (float) win->w / (float) img->w;
142 zh = (float) win->h / (float) img->h;
143
144 img->zoom = MIN(zw, zh);
145 img->zoom = MAX(img->zoom, zoom_min);
146 img->zoom = MIN(img->zoom, zoom_max);
147
148 return oz != img->zoom;
149}
150
151void img_render(img_t *img, win_t *win) {
152 int sx, sy, sw, sh;
153 int dx, dy, dw, dh;
154
155 if (!img || !win || !imlib_context_get_image())
156 return;
157
158 if (img->scalemode != SCALE_ZOOM) {
159 img_fit(img, win);
160 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
161 img->zoom = 1.0;
162 }
163
164 if (!img->re) {
165 /* rendered for the first time */
166 img->re = 1;
167 img_center(img, win);
168 }
169
170 if (img->checkpan) {
171 img_check_pan(img, win);
172 img->checkpan = 0;
173 }
174
175 /* calculate source and destination offsets */
176 if (img->x < 0) {
177 sx = -img->x / img->zoom;
178 sw = win->w / img->zoom;
179 dx = 0;
180 dw = win->w;
181 } else {
182 sx = 0;
183 sw = img->w;
184 dx = img->x;
185 dw = img->w * img->zoom;
186 }
187 if (img->y < 0) {
188 sy = -img->y / img->zoom;
189 sh = win->h / img->zoom;
190 dy = 0;
191 dh = win->h;
192 } else {
193 sy = 0;
194 sh = img->h;
195 dy = img->y;
196 dh = img->h * img->zoom;
197 }
198
199 win_clear(win);
200
201 imlib_context_set_drawable(win->pm);
202 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
203
204 win_draw(win);
205}
206
207int img_fit_win(img_t *img, win_t *win) {
208 if (!img || !img->valid || !win)
209 return 0;
210
211 img->scalemode = SCALE_FIT;
212 return img_fit(img, win);
213}
214
215int img_center(img_t *img, win_t *win) {
216 int ox, oy;
217
218 if (!img || !win)
219 return 0;
220
221 ox = img->x;
222 oy = img->y;
223
224 img->x = (win->w - img->w * img->zoom) / 2;
225 img->y = (win->h - img->h * img->zoom) / 2;
226
227 return ox != img->x || oy != img->y;
228}
229
230int img_zoom(img_t *img, float z) {
231 if (!img || !img->valid)
232 return 0;
233
234 z = MAX(z, zoom_min);
235 z = MIN(z, zoom_max);
236
237 img->scalemode = SCALE_ZOOM;
238
239 if (z != img->zoom) {
240 img->x -= (img->w * z - img->w * img->zoom) / 2;
241 img->y -= (img->h * z - img->h * img->zoom) / 2;
242 img->zoom = z;
243 img->checkpan = 1;
244 return 1;
245 } else {
246 return 0;
247 }
248}
249
250int img_zoom_in(img_t *img) {
251 int i;
252
253 if (!img || !img->valid)
254 return 0;
255
256 for (i = 1; i < zl_cnt; ++i) {
257 if (zoom_levels[i] > img->zoom * 100.0)
258 return img_zoom(img, zoom_levels[i] / 100.0);
259 }
260 return 0;
261}
262
263int img_zoom_out(img_t *img) {
264 int i;
265
266 if (!img || !img->valid)
267 return 0;
268
269 for (i = zl_cnt - 2; i >= 0; --i) {
270 if (zoom_levels[i] < img->zoom * 100.0)
271 return img_zoom(img, zoom_levels[i] / 100.0);
272 }
273 return 0;
274}
275
276int img_move(img_t *img, win_t *win, int dx, int dy) {
277 int ox, oy;
278
279 if (!img || !img->valid || !win)
280 return 0;
281
282 ox = img->x;
283 oy = img->y;
284
285 img->x += dx;
286 img->y += dy;
287
288 img_check_pan(img, win);
289
290 return ox != img->x || oy != img->y;
291}
292
293int img_pan(img_t *img, win_t *win, pandir_t dir) {
294 if (!img || !img->valid || !win)
295 return 0;
296
297 switch (dir) {
298 case PAN_LEFT:
299 return img_move(img, win, win->w / 5, 0);
300 case PAN_RIGHT:
301 return img_move(img, win, win->w / 5 * -1, 0);
302 case PAN_UP:
303 return img_move(img, win, 0, win->h / 5);
304 case PAN_DOWN:
305 return img_move(img, win, 0, win->h / 5 * -1);
306 }
307
308 return 0;
309}
310
311void img_rotate(img_t *img, win_t *win, int d) {
312 int ox, oy, tmp;
313
314 if (!img || !img->valid || !win)
315 return;
316
317 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
318 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
319
320 imlib_image_orientate(d);
321
322 img->x = oy + (win->w - win->h) / 2;
323 img->y = ox + (win->h - win->w) / 2;
324
325 tmp = img->w;
326 img->w = img->h;
327 img->h = tmp;
328
329 img->checkpan = 1;
330}
331
332void img_rotate_left(img_t *img, win_t *win) {
333 img_rotate(img, win, 3);
334}
335
336void img_rotate_right(img_t *img, win_t *win) {
337 img_rotate(img, win, 1);
338}
339
340void img_toggle_antialias(img_t *img) {
341 if (!img || !img->valid)
342 return;
343
344 img->aa ^= 1;
345 imlib_context_set_anti_alias(img->aa);
346}