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nsxivimage.c

368 lines · 7.4 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_warn;
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_warn = imlib_create_image_using_data(32, 32, icon_warn);
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_warn);
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_warn);
99 imlib_image_set_has_alpha(1);
100 imlib_context_set_anti_alias(0);
101 img->scalemode = SCALE_DOWN;
102 }
103
104 img->re = 0;
105 img->checkpan = 0;
106
107 img->w = imlib_image_get_width();
108 img->h = imlib_image_get_height();
109
110 return 1;
111}
112
113void img_check_pan(img_t *img, win_t *win) {
114 if (!img || !win)
115 return;
116
117 if (img->w * img->zoom > win->w) {
118 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
119 img->x = 0;
120 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
121 img->x = win->w - img->w * img->zoom;
122 } else {
123 img->x = (win->w - img->w * img->zoom) / 2;
124 }
125 if (img->h * img->zoom > win->h) {
126 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
127 img->y = 0;
128 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
129 img->y = win->h - img->h * img->zoom;
130 } else {
131 img->y = (win->h - img->h * img->zoom) / 2;
132 }
133}
134
135int img_fit(img_t *img, win_t *win) {
136 float oz, zw, zh;
137
138 if (!img || !win)
139 return 0;
140
141 oz = img->zoom;
142 zw = (float) win->w / (float) img->w;
143 zh = (float) win->h / (float) img->h;
144
145 img->zoom = MIN(zw, zh);
146 img->zoom = MAX(img->zoom, zoom_min);
147 img->zoom = MIN(img->zoom, zoom_max);
148
149 return oz != img->zoom;
150}
151
152int img_load_thumb(thumb_t *tn, const char *filename) {
153 int w;
154 int h;
155
156 if (!tn)
157 return 0;
158
159 if (!_imlib_load_image(filename))
160 return 0;
161
162 w = imlib_image_get_width();
163 h = imlib_image_get_height();
164
165 imlib_context_set_drawable(tn->pm);
166 imlib_render_image_part_on_drawable_at_size(0, 0, w, h,
167 0, 0, THUMB_SIZE, THUMB_SIZE);
168 imlib_free_image();
169
170 return 1;
171}
172
173void img_render(img_t *img, win_t *win) {
174 int sx, sy, sw, sh;
175 int dx, dy, dw, dh;
176
177 if (!img || !win || !imlib_context_get_image())
178 return;
179
180 if (img->scalemode != SCALE_ZOOM) {
181 img_fit(img, win);
182 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
183 img->zoom = 1.0;
184 }
185
186 if (!img->re) {
187 /* rendered for the first time */
188 img->re = 1;
189 img_center(img, win);
190 }
191
192 if (img->checkpan) {
193 img_check_pan(img, win);
194 img->checkpan = 0;
195 }
196
197 /* calculate source and destination offsets */
198 if (img->x < 0) {
199 sx = -img->x / img->zoom;
200 sw = win->w / img->zoom;
201 dx = 0;
202 dw = win->w;
203 } else {
204 sx = 0;
205 sw = img->w;
206 dx = img->x;
207 dw = img->w * img->zoom;
208 }
209 if (img->y < 0) {
210 sy = -img->y / img->zoom;
211 sh = win->h / img->zoom;
212 dy = 0;
213 dh = win->h;
214 } else {
215 sy = 0;
216 sh = img->h;
217 dy = img->y;
218 dh = img->h * img->zoom;
219 }
220
221 win_clear(win);
222
223 imlib_context_set_drawable(win->pm);
224 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
225
226 win_draw(win);
227}
228
229int img_fit_win(img_t *img, win_t *win) {
230 if (!img || !img->valid || !win)
231 return 0;
232
233 img->scalemode = SCALE_FIT;
234 return img_fit(img, win);
235}
236
237int img_center(img_t *img, win_t *win) {
238 int ox, oy;
239
240 if (!img || !win)
241 return 0;
242
243 ox = img->x;
244 oy = img->y;
245
246 img->x = (win->w - img->w * img->zoom) / 2;
247 img->y = (win->h - img->h * img->zoom) / 2;
248
249 return ox != img->x || oy != img->y;
250}
251
252int img_zoom(img_t *img, float z) {
253 if (!img || !img->valid)
254 return 0;
255
256 z = MAX(z, zoom_min);
257 z = MIN(z, zoom_max);
258
259 img->scalemode = SCALE_ZOOM;
260
261 if (z != img->zoom) {
262 img->x -= (img->w * z - img->w * img->zoom) / 2;
263 img->y -= (img->h * z - img->h * img->zoom) / 2;
264 img->zoom = z;
265 img->checkpan = 1;
266 return 1;
267 } else {
268 return 0;
269 }
270}
271
272int img_zoom_in(img_t *img) {
273 int i;
274
275 if (!img || !img->valid)
276 return 0;
277
278 for (i = 1; i < zl_cnt; ++i) {
279 if (zoom_levels[i] > img->zoom * 100.0)
280 return img_zoom(img, zoom_levels[i] / 100.0);
281 }
282 return 0;
283}
284
285int img_zoom_out(img_t *img) {
286 int i;
287
288 if (!img || !img->valid)
289 return 0;
290
291 for (i = zl_cnt - 2; i >= 0; --i) {
292 if (zoom_levels[i] < img->zoom * 100.0)
293 return img_zoom(img, zoom_levels[i] / 100.0);
294 }
295 return 0;
296}
297
298int img_move(img_t *img, win_t *win, int dx, int dy) {
299 int ox, oy;
300
301 if (!img || !img->valid || !win)
302 return 0;
303
304 ox = img->x;
305 oy = img->y;
306
307 img->x += dx;
308 img->y += dy;
309
310 img_check_pan(img, win);
311
312 return ox != img->x || oy != img->y;
313}
314
315int img_pan(img_t *img, win_t *win, pandir_t dir) {
316 if (!img || !img->valid || !win)
317 return 0;
318
319 switch (dir) {
320 case PAN_LEFT:
321 return img_move(img, win, win->w / 5, 0);
322 case PAN_RIGHT:
323 return img_move(img, win, win->w / 5 * -1, 0);
324 case PAN_UP:
325 return img_move(img, win, 0, win->h / 5);
326 case PAN_DOWN:
327 return img_move(img, win, 0, win->h / 5 * -1);
328 }
329
330 return 0;
331}
332
333void img_rotate(img_t *img, win_t *win, int d) {
334 int ox, oy, tmp;
335
336 if (!img || !img->valid || !win)
337 return;
338
339 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
340 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
341
342 imlib_image_orientate(d);
343
344 img->x = oy + (win->w - win->h) / 2;
345 img->y = ox + (win->h - win->w) / 2;
346
347 tmp = img->w;
348 img->w = img->h;
349 img->h = tmp;
350
351 img->checkpan = 1;
352}
353
354void img_rotate_left(img_t *img, win_t *win) {
355 img_rotate(img, win, 3);
356}
357
358void img_rotate_right(img_t *img, win_t *win) {
359 img_rotate(img, win, 1);
360}
361
362void img_toggle_antialias(img_t *img) {
363 if (!img || !img->valid)
364 return;
365
366 img->aa ^= 1;
367 imlib_context_set_anti_alias(img->aa);
368}