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nsxivimage.c

360 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
21#include "config.h"
22#include "icon.h"
23#include "image.h"
24#include "options.h"
25#include "util.h"
26
27int zl_cnt;
28float zoom_min;
29float zoom_max;
30
31Imlib_Image *im_broken;
32
33void img_init(img_t *img, win_t *win) {
34 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
35 zoom_min = zoom_levels[0] / 100.0;
36 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
37
38 im_broken = imlib_create_image_using_data(32, 32, icon_broken);
39
40 if (img) {
41 img->im = NULL;
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 imlib_context_set_image(im_broken);
57 imlib_free_image();
58}
59
60int img_check(const char *filename) {
61 Imlib_Image *im;
62
63 if (!filename)
64 return 0;
65
66 if (!access(filename, F_OK) && (im = imlib_load_image(filename))) {
67 imlib_context_set_image(im);
68 imlib_image_set_changes_on_disk();
69 imlib_free_image();
70 return 1;
71 } else {
72 warn("could not open file: %s", filename);
73 return 0;
74 }
75}
76
77int img_load(img_t *img, const char *filename) {
78 if (!img || !filename)
79 return 0;
80
81 if (!access(filename, F_OK) && (img->im = imlib_load_image(filename))) {
82 imlib_context_set_image(img->im);
83 imlib_image_set_changes_on_disk();
84 imlib_context_set_anti_alias(img->aa);
85 img->scalemode = options->scalemode;
86 } else {
87 warn("could not open file: %s", filename);
88 imlib_context_set_image(im_broken);
89 imlib_context_set_anti_alias(0);
90 img->scalemode = SCALE_DOWN;
91 }
92
93 img->re = 0;
94 img->checkpan = 0;
95
96 img->w = imlib_image_get_width();
97 img->h = imlib_image_get_height();
98
99 return 1;
100}
101
102void img_close(img_t *img, int decache) {
103 if (img && img->im) {
104 imlib_context_set_image(img->im);
105 if (decache)
106 imlib_free_image_and_decache();
107 else
108 imlib_free_image();
109 img->im = NULL;
110 }
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
152void img_render(img_t *img, win_t *win) {
153 int sx, sy, sw, sh;
154 int dx, dy, dw, dh;
155
156 if (!img || !win)
157 return;
158
159 if (img->scalemode != SCALE_ZOOM) {
160 img_fit(img, win);
161 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
162 img->zoom = 1.0;
163 }
164
165 if (!img->re) {
166 /* rendered for the first time */
167 img->re = 1;
168 if (img->zoom * img->w <= win->w)
169 img->x = (win->w - img->w * img->zoom) / 2;
170 else
171 img->x = 0;
172 if (img->zoom * img->h <= win->h)
173 img->y = (win->h - img->h * img->zoom) / 2;
174 else
175 img->y = 0;
176 }
177
178 if (img->checkpan) {
179 img_check_pan(img, win);
180 img->checkpan = 0;
181 }
182
183 /* calculate source and destination offsets */
184 if (img->x < 0) {
185 sx = -img->x / img->zoom;
186 sw = win->w / img->zoom;
187 dx = 0;
188 dw = win->w;
189 } else {
190 sx = 0;
191 sw = img->w;
192 dx = img->x;
193 dw = img->w * img->zoom;
194 }
195 if (img->y < 0) {
196 sy = -img->y / img->zoom;
197 sh = win->h / img->zoom;
198 dy = 0;
199 dh = win->h;
200 } else {
201 sy = 0;
202 sh = img->h;
203 dy = img->y;
204 dh = img->h * img->zoom;
205 }
206
207 win_clear(win);
208
209 if (img->im)
210 imlib_context_set_image(img->im);
211 else
212 imlib_context_set_image(im_broken);
213
214 imlib_context_set_drawable(win->pm);
215 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
216
217 win_draw(win);
218}
219
220int img_fit_win(img_t *img, win_t *win) {
221 if (!img || !img->im || !win)
222 return 0;
223
224 img->scalemode = SCALE_FIT;
225 return img_fit(img, win);
226}
227
228int img_center(img_t *img, win_t *win) {
229 int ox, oy;
230
231 if (!img || !win)
232 return 0;
233
234 ox = img->x;
235 oy = img->y;
236
237 img->x = (win->w - img->w * img->zoom) / 2;
238 img->y = (win->h - img->h * img->zoom) / 2;
239
240 return ox != img->x || oy != img->y;
241}
242
243int img_zoom(img_t *img, float z) {
244 if (!img || !img->im)
245 return 0;
246
247 z = MAX(z, zoom_min);
248 z = MIN(z, zoom_max);
249
250 img->scalemode = SCALE_ZOOM;
251
252 if (z != img->zoom) {
253 img->x -= (img->w * z - img->w * img->zoom) / 2;
254 img->y -= (img->h * z - img->h * img->zoom) / 2;
255 img->zoom = z;
256 img->checkpan = 1;
257 return 1;
258 } else {
259 return 0;
260 }
261}
262
263int img_zoom_in(img_t *img) {
264 int i;
265
266 if (!img || !img->im)
267 return 0;
268
269 for (i = 1; i < zl_cnt; ++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_zoom_out(img_t *img) {
277 int i;
278
279 if (!img || !img->im)
280 return 0;
281
282 for (i = zl_cnt - 2; i >= 0; --i) {
283 if (zoom_levels[i] < img->zoom * 100.0)
284 return img_zoom(img, zoom_levels[i] / 100.0);
285 }
286 return 0;
287}
288
289int img_move(img_t *img, win_t *win, int dx, int dy) {
290 int ox, oy;
291
292 if (!img || !img->im || !win)
293 return 0;
294
295 ox = img->x;
296 oy = img->y;
297
298 img->x += dx;
299 img->y += dy;
300
301 img_check_pan(img, win);
302
303 return ox != img->x || oy != img->y;
304}
305
306int img_pan(img_t *img, win_t *win, pandir_t dir) {
307 if (!img || !img->im || !win)
308 return 0;
309
310 switch (dir) {
311 case PAN_LEFT:
312 return img_move(img, win, win->w / 5, 0);
313 case PAN_RIGHT:
314 return img_move(img, win, win->w / 5 * -1, 0);
315 case PAN_UP:
316 return img_move(img, win, 0, win->h / 5);
317 case PAN_DOWN:
318 return img_move(img, win, 0, win->h / 5 * -1);
319 }
320
321 return 0;
322}
323
324void img_rotate(img_t *img, win_t *win, int d) {
325 int ox, oy, tmp;
326
327 if (!img || !img->im || !win)
328 return;
329
330 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
331 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
332
333 imlib_context_set_image(img->im);
334 imlib_image_orientate(d);
335
336 img->x = oy + (win->w - win->h) / 2;
337 img->y = ox + (win->h - win->w) / 2;
338
339 tmp = img->w;
340 img->w = img->h;
341 img->h = tmp;
342
343 img->checkpan = 1;
344}
345
346void img_rotate_left(img_t *img, win_t *win) {
347 img_rotate(img, win, 3);
348}
349
350void img_rotate_right(img_t *img, win_t *win) {
351 img_rotate(img, win, 1);
352}
353
354void img_toggle_antialias(img_t *img) {
355 if (img && img->im) {
356 img->aa ^= 1;
357 imlib_context_set_image(img->im);
358 imlib_context_set_anti_alias(img->aa);
359 }
360}