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nsxivimage.c

386 lines · 7.8 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 <string.h>
20#include <unistd.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
32const short ori_left[8] = { 8, 7, 6, 5, 2, 1, 4, 3 };
33const short ori_right[8] = { 6, 5, 8, 7, 4, 3, 2, 1 };
34
35Imlib_Image *im_broken;
36
37void img_init(img_t *img, win_t *win) {
38 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
39 zoom_min = zoom_levels[0] / 100.0;
40 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
41
42 im_broken = imlib_create_image_using_data(32, 32, icon_broken);
43
44 if (img) {
45 img->im = NULL;
46 img->zoom = options->zoom;
47 img->zoom = MAX(img->zoom, zoom_min);
48 img->zoom = MIN(img->zoom, zoom_max);
49 img->aa = options->aa;
50 }
51
52 if (win) {
53 imlib_context_set_display(win->env.dpy);
54 imlib_context_set_visual(win->env.vis);
55 imlib_context_set_colormap(win->env.cmap);
56 }
57}
58
59void img_free(img_t* img) {
60 imlib_context_set_image(im_broken);
61 imlib_free_image();
62}
63
64int img_check(const char *filename) {
65 Imlib_Image *im;
66
67 if (!filename)
68 return 0;
69
70 if (!access(filename, F_OK) && (im = imlib_load_image(filename))) {
71 imlib_context_set_image(im);
72 imlib_image_set_changes_on_disk();
73 imlib_free_image();
74 return 1;
75 } else {
76 warn("could not open file: %s", filename);
77 return 0;
78 }
79}
80
81int img_load(img_t *img, const char *filename) {
82 if (!img || !filename)
83 return 0;
84
85 if (!access(filename, F_OK) && (img->im = imlib_load_image(filename))) {
86 imlib_context_set_image(img->im);
87 imlib_image_set_changes_on_disk();
88 imlib_context_set_anti_alias(img->aa);
89 img->scalemode = options->scalemode;
90 } else {
91 warn("could not open file: %s", filename);
92 imlib_context_set_image(im_broken);
93 imlib_context_set_anti_alias(0);
94 img->scalemode = SCALE_DOWN;
95 }
96
97 img->ori = img->o_ori = 1;
98 img->re = img->checkpan = 0;
99
100 img->w = imlib_image_get_width();
101 img->h = imlib_image_get_height();
102
103 return 1;
104}
105
106int img_save(img_t *img) {
107 const char *fmt;
108
109 if (!img || !img->im)
110 return 0;
111
112 imlib_context_set_image(img->im);
113
114 if (img->ori != img->o_ori) {
115 fmt = imlib_image_format();
116 if (strcmp(fmt, "png") == 0) {
117 imlib_save_image(imlib_image_get_filename());
118 return 1;
119 }
120 }
121
122 return 0;
123}
124
125void img_close(img_t *img) {
126 if (img && img->im) {
127 imlib_context_set_image(img->im);
128 imlib_free_image();
129 img->im = NULL;
130 }
131}
132
133void img_check_pan(img_t *img, win_t *win) {
134 if (!img || !win)
135 return;
136
137 if (img->w * img->zoom > win->w) {
138 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
139 img->x = 0;
140 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
141 img->x = win->w - img->w * img->zoom;
142 } else {
143 img->x = (win->w - img->w * img->zoom) / 2;
144 }
145 if (img->h * img->zoom > win->h) {
146 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
147 img->y = 0;
148 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
149 img->y = win->h - img->h * img->zoom;
150 } else {
151 img->y = (win->h - img->h * img->zoom) / 2;
152 }
153}
154
155int img_fit(img_t *img, win_t *win) {
156 float oz, zw, zh;
157
158 if (!img || !win)
159 return 0;
160
161 oz = img->zoom;
162 zw = (float) win->w / (float) img->w;
163 zh = (float) win->h / (float) img->h;
164
165 img->zoom = MIN(zw, zh);
166 img->zoom = MAX(img->zoom, zoom_min);
167 img->zoom = MIN(img->zoom, zoom_max);
168
169 return oz != img->zoom;
170}
171
172void img_render(img_t *img, win_t *win) {
173 int sx, sy, sw, sh;
174 int dx, dy, dw, dh;
175
176 if (!img || !win)
177 return;
178
179 if (img->scalemode != SCALE_ZOOM) {
180 img_fit(img, win);
181 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
182 img->zoom = 1.0;
183 }
184
185 if (!img->re) {
186 /* rendered for the first time */
187 img->re = 1;
188 if (img->zoom * img->w <= win->w)
189 img->x = (win->w - img->w * img->zoom) / 2;
190 else
191 img->x = 0;
192 if (img->zoom * img->h <= win->h)
193 img->y = (win->h - img->h * img->zoom) / 2;
194 else
195 img->y = 0;
196 }
197
198 if (img->checkpan) {
199 img_check_pan(img, win);
200 img->checkpan = 0;
201 }
202
203 /* calculate source and destination offsets */
204 if (img->x < 0) {
205 sx = -img->x / img->zoom;
206 sw = win->w / img->zoom;
207 dx = 0;
208 dw = win->w;
209 } else {
210 sx = 0;
211 sw = img->w;
212 dx = img->x;
213 dw = img->w * img->zoom;
214 }
215 if (img->y < 0) {
216 sy = -img->y / img->zoom;
217 sh = win->h / img->zoom;
218 dy = 0;
219 dh = win->h;
220 } else {
221 sy = 0;
222 sh = img->h;
223 dy = img->y;
224 dh = img->h * img->zoom;
225 }
226
227 win_clear(win);
228
229 if (img->im)
230 imlib_context_set_image(img->im);
231 else
232 imlib_context_set_image(im_broken);
233
234 imlib_context_set_drawable(win->pm);
235 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
236
237 win_draw(win);
238}
239
240int img_fit_win(img_t *img, win_t *win) {
241 if (!img || !img->im || !win)
242 return 0;
243
244 img->scalemode = SCALE_FIT;
245 return img_fit(img, win);
246}
247
248int img_center(img_t *img, win_t *win) {
249 int ox, oy;
250
251 if (!img || !win)
252 return 0;
253
254 ox = img->x;
255 oy = img->y;
256
257 img->x = (win->w - img->w * img->zoom) / 2;
258 img->y = (win->h - img->h * img->zoom) / 2;
259
260 return ox != img->x || oy != img->y;
261}
262
263int img_zoom(img_t *img, float z) {
264 if (!img || !img->im)
265 return 0;
266
267 z = MAX(z, zoom_min);
268 z = MIN(z, zoom_max);
269
270 img->scalemode = SCALE_ZOOM;
271
272 if (z != img->zoom) {
273 img->x -= (img->w * z - img->w * img->zoom) / 2;
274 img->y -= (img->h * z - img->h * img->zoom) / 2;
275 img->zoom = z;
276 img->checkpan = 1;
277 return 1;
278 } else {
279 return 0;
280 }
281}
282
283int img_zoom_in(img_t *img) {
284 int i;
285
286 if (!img || !img->im)
287 return 0;
288
289 for (i = 1; i < zl_cnt; ++i) {
290 if (zoom_levels[i] > img->zoom * 100.0)
291 return img_zoom(img, zoom_levels[i] / 100.0);
292 }
293 return 0;
294}
295
296int img_zoom_out(img_t *img) {
297 int i;
298
299 if (!img || !img->im)
300 return 0;
301
302 for (i = zl_cnt - 2; i >= 0; --i) {
303 if (zoom_levels[i] < img->zoom * 100.0)
304 return img_zoom(img, zoom_levels[i] / 100.0);
305 }
306 return 0;
307}
308
309int img_move(img_t *img, win_t *win, int dx, int dy) {
310 int ox, oy;
311
312 if (!img || !img->im || !win)
313 return 0;
314
315 ox = img->x;
316 oy = img->y;
317
318 img->x += dx;
319 img->y += dy;
320
321 img_check_pan(img, win);
322
323 return ox != img->x || oy != img->y;
324}
325
326int img_pan(img_t *img, win_t *win, pandir_t dir) {
327 if (!img || !img->im || !win)
328 return 0;
329
330 switch (dir) {
331 case PAN_LEFT:
332 return img_move(img, win, win->w / 5, 0);
333 case PAN_RIGHT:
334 return img_move(img, win, win->w / 5 * -1, 0);
335 case PAN_UP:
336 return img_move(img, win, 0, win->h / 5);
337 case PAN_DOWN:
338 return img_move(img, win, 0, win->h / 5 * -1);
339 }
340
341 return 0;
342}
343
344void img_rotate(img_t *img, win_t *win, int d) {
345 int ox, oy, tmp;
346
347 if (!img || !img->im || !win)
348 return;
349
350 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
351 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
352
353 imlib_context_set_image(img->im);
354 imlib_image_orientate(d);
355
356 img->x = oy + (win->w - win->h) / 2;
357 img->y = ox + (win->h - win->w) / 2;
358
359 tmp = img->w;
360 img->w = img->h;
361 img->h = tmp;
362
363 img->checkpan = 1;
364}
365
366void img_rotate_left(img_t *img, win_t *win) {
367 if (img) {
368 img_rotate(img, win, 3);
369 img->ori = ori_left[img->ori];
370 }
371}
372
373void img_rotate_right(img_t *img, win_t *win) {
374 if (img) {
375 img_rotate(img, win, 1);
376 img->ori = ori_right[img->ori];
377 }
378}
379
380void img_toggle_antialias(img_t *img) {
381 if (img && img->im) {
382 img->aa ^= 1;
383 imlib_context_set_image(img->im);
384 imlib_context_set_anti_alias(img->aa);
385 }
386}