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nsxivimage.c

373 lines · 7.6 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
113int img_load_thumb(thumb_t *tn, const char *filename) {
114 int w, h;
115 float z, zw, zh;
116
117 if (!tn)
118 return 0;
119
120 if (!_imlib_load_image(filename))
121 return 0;
122
123 w = imlib_image_get_width();
124 h = imlib_image_get_height();
125 zw = (float) THUMB_SIZE / (float) w;
126 zh = (float) THUMB_SIZE / (float) h;
127 z = MIN(zw, zh);
128 tn->w = z * w;
129 tn->h = z * h;
130
131 imlib_context_set_drawable(tn->pm);
132 imlib_render_image_part_on_drawable_at_size(0, 0, w, h,
133 0, 0, tn->w, tn->h);
134 imlib_free_image();
135
136 return 1;
137}
138
139void img_check_pan(img_t *img, win_t *win) {
140 if (!img || !win)
141 return;
142
143 if (img->w * img->zoom > win->w) {
144 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
145 img->x = 0;
146 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
147 img->x = win->w - img->w * img->zoom;
148 } else {
149 img->x = (win->w - img->w * img->zoom) / 2;
150 }
151 if (img->h * img->zoom > win->h) {
152 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
153 img->y = 0;
154 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
155 img->y = win->h - img->h * img->zoom;
156 } else {
157 img->y = (win->h - img->h * img->zoom) / 2;
158 }
159}
160
161int img_fit(img_t *img, win_t *win) {
162 float oz, zw, zh;
163
164 if (!img || !win)
165 return 0;
166
167 oz = img->zoom;
168 zw = (float) win->w / (float) img->w;
169 zh = (float) win->h / (float) img->h;
170
171 img->zoom = MIN(zw, zh);
172 img->zoom = MAX(img->zoom, zoom_min);
173 img->zoom = MIN(img->zoom, zoom_max);
174
175 return oz != img->zoom;
176}
177
178void img_render(img_t *img, win_t *win) {
179 int sx, sy, sw, sh;
180 int dx, dy, dw, dh;
181
182 if (!img || !win || !imlib_context_get_image())
183 return;
184
185 if (img->scalemode != SCALE_ZOOM) {
186 img_fit(img, win);
187 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
188 img->zoom = 1.0;
189 }
190
191 if (!img->re) {
192 /* rendered for the first time */
193 img->re = 1;
194 img_center(img, win);
195 }
196
197 if (img->checkpan) {
198 img_check_pan(img, win);
199 img->checkpan = 0;
200 }
201
202 /* calculate source and destination offsets */
203 if (img->x < 0) {
204 sx = -img->x / img->zoom;
205 sw = win->w / img->zoom;
206 dx = 0;
207 dw = win->w;
208 } else {
209 sx = 0;
210 sw = img->w;
211 dx = img->x;
212 dw = img->w * img->zoom;
213 }
214 if (img->y < 0) {
215 sy = -img->y / img->zoom;
216 sh = win->h / img->zoom;
217 dy = 0;
218 dh = win->h;
219 } else {
220 sy = 0;
221 sh = img->h;
222 dy = img->y;
223 dh = img->h * img->zoom;
224 }
225
226 win_clear(win);
227
228 imlib_context_set_drawable(win->pm);
229 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
230
231 win_draw(win);
232}
233
234int img_fit_win(img_t *img, win_t *win) {
235 if (!img || !img->valid || !win)
236 return 0;
237
238 img->scalemode = SCALE_FIT;
239 return img_fit(img, win);
240}
241
242int img_center(img_t *img, win_t *win) {
243 int ox, oy;
244
245 if (!img || !win)
246 return 0;
247
248 ox = img->x;
249 oy = img->y;
250
251 img->x = (win->w - img->w * img->zoom) / 2;
252 img->y = (win->h - img->h * img->zoom) / 2;
253
254 return ox != img->x || oy != img->y;
255}
256
257int img_zoom(img_t *img, float z) {
258 if (!img || !img->valid)
259 return 0;
260
261 z = MAX(z, zoom_min);
262 z = MIN(z, zoom_max);
263
264 img->scalemode = SCALE_ZOOM;
265
266 if (z != img->zoom) {
267 img->x -= (img->w * z - img->w * img->zoom) / 2;
268 img->y -= (img->h * z - img->h * img->zoom) / 2;
269 img->zoom = z;
270 img->checkpan = 1;
271 return 1;
272 } else {
273 return 0;
274 }
275}
276
277int img_zoom_in(img_t *img) {
278 int i;
279
280 if (!img || !img->valid)
281 return 0;
282
283 for (i = 1; i < zl_cnt; ++i) {
284 if (zoom_levels[i] > img->zoom * 100.0)
285 return img_zoom(img, zoom_levels[i] / 100.0);
286 }
287 return 0;
288}
289
290int img_zoom_out(img_t *img) {
291 int i;
292
293 if (!img || !img->valid)
294 return 0;
295
296 for (i = zl_cnt - 2; i >= 0; --i) {
297 if (zoom_levels[i] < img->zoom * 100.0)
298 return img_zoom(img, zoom_levels[i] / 100.0);
299 }
300 return 0;
301}
302
303int img_move(img_t *img, win_t *win, int dx, int dy) {
304 int ox, oy;
305
306 if (!img || !img->valid || !win)
307 return 0;
308
309 ox = img->x;
310 oy = img->y;
311
312 img->x += dx;
313 img->y += dy;
314
315 img_check_pan(img, win);
316
317 return ox != img->x || oy != img->y;
318}
319
320int img_pan(img_t *img, win_t *win, pandir_t dir) {
321 if (!img || !img->valid || !win)
322 return 0;
323
324 switch (dir) {
325 case PAN_LEFT:
326 return img_move(img, win, win->w / 5, 0);
327 case PAN_RIGHT:
328 return img_move(img, win, win->w / 5 * -1, 0);
329 case PAN_UP:
330 return img_move(img, win, 0, win->h / 5);
331 case PAN_DOWN:
332 return img_move(img, win, 0, win->h / 5 * -1);
333 }
334
335 return 0;
336}
337
338void img_rotate(img_t *img, win_t *win, int d) {
339 int ox, oy, tmp;
340
341 if (!img || !img->valid || !win)
342 return;
343
344 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
345 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
346
347 imlib_image_orientate(d);
348
349 img->x = oy + (win->w - win->h) / 2;
350 img->y = ox + (win->h - win->w) / 2;
351
352 tmp = img->w;
353 img->w = img->h;
354 img->h = tmp;
355
356 img->checkpan = 1;
357}
358
359void img_rotate_left(img_t *img, win_t *win) {
360 img_rotate(img, win, 3);
361}
362
363void img_rotate_right(img_t *img, win_t *win) {
364 img_rotate(img, win, 1);
365}
366
367void img_toggle_antialias(img_t *img) {
368 if (!img || !img->valid)
369 return;
370
371 img->aa ^= 1;
372 imlib_context_set_anti_alias(img->aa);
373}