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nsxivimage.c

347 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_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
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 || !imlib_context_get_image())
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 img_center(img, win);
169 }
170
171 if (img->checkpan) {
172 img_check_pan(img, win);
173 img->checkpan = 0;
174 }
175
176 /* calculate source and destination offsets */
177 if (img->x < 0) {
178 sx = -img->x / img->zoom;
179 sw = win->w / img->zoom;
180 dx = 0;
181 dw = win->w;
182 } else {
183 sx = 0;
184 sw = img->w;
185 dx = img->x;
186 dw = img->w * img->zoom;
187 }
188 if (img->y < 0) {
189 sy = -img->y / img->zoom;
190 sh = win->h / img->zoom;
191 dy = 0;
192 dh = win->h;
193 } else {
194 sy = 0;
195 sh = img->h;
196 dy = img->y;
197 dh = img->h * img->zoom;
198 }
199
200 win_clear(win);
201
202 imlib_context_set_drawable(win->pm);
203 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
204
205 win_draw(win);
206}
207
208int img_fit_win(img_t *img, win_t *win) {
209 if (!img || !img->valid || !win)
210 return 0;
211
212 img->scalemode = SCALE_FIT;
213 return img_fit(img, win);
214}
215
216int img_center(img_t *img, win_t *win) {
217 int ox, oy;
218
219 if (!img || !win)
220 return 0;
221
222 ox = img->x;
223 oy = img->y;
224
225 img->x = (win->w - img->w * img->zoom) / 2;
226 img->y = (win->h - img->h * img->zoom) / 2;
227
228 return ox != img->x || oy != img->y;
229}
230
231int img_zoom(img_t *img, float z) {
232 if (!img || !img->valid)
233 return 0;
234
235 z = MAX(z, zoom_min);
236 z = MIN(z, zoom_max);
237
238 img->scalemode = SCALE_ZOOM;
239
240 if (z != img->zoom) {
241 img->x -= (img->w * z - img->w * img->zoom) / 2;
242 img->y -= (img->h * z - img->h * img->zoom) / 2;
243 img->zoom = z;
244 img->checkpan = 1;
245 return 1;
246 } else {
247 return 0;
248 }
249}
250
251int img_zoom_in(img_t *img) {
252 int i;
253
254 if (!img || !img->valid)
255 return 0;
256
257 for (i = 1; i < zl_cnt; ++i) {
258 if (zoom_levels[i] > img->zoom * 100.0)
259 return img_zoom(img, zoom_levels[i] / 100.0);
260 }
261 return 0;
262}
263
264int img_zoom_out(img_t *img) {
265 int i;
266
267 if (!img || !img->valid)
268 return 0;
269
270 for (i = zl_cnt - 2; i >= 0; --i) {
271 if (zoom_levels[i] < img->zoom * 100.0)
272 return img_zoom(img, zoom_levels[i] / 100.0);
273 }
274 return 0;
275}
276
277int img_move(img_t *img, win_t *win, int dx, int dy) {
278 int ox, oy;
279
280 if (!img || !img->valid || !win)
281 return 0;
282
283 ox = img->x;
284 oy = img->y;
285
286 img->x += dx;
287 img->y += dy;
288
289 img_check_pan(img, win);
290
291 return ox != img->x || oy != img->y;
292}
293
294int img_pan(img_t *img, win_t *win, pandir_t dir) {
295 if (!img || !img->valid || !win)
296 return 0;
297
298 switch (dir) {
299 case PAN_LEFT:
300 return img_move(img, win, win->w / 5, 0);
301 case PAN_RIGHT:
302 return img_move(img, win, win->w / 5 * -1, 0);
303 case PAN_UP:
304 return img_move(img, win, 0, win->h / 5);
305 case PAN_DOWN:
306 return img_move(img, win, 0, win->h / 5 * -1);
307 }
308
309 return 0;
310}
311
312void img_rotate(img_t *img, win_t *win, int d) {
313 int ox, oy, tmp;
314
315 if (!img || !img->valid || !win)
316 return;
317
318 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
319 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
320
321 imlib_image_orientate(d);
322
323 img->x = oy + (win->w - win->h) / 2;
324 img->y = ox + (win->h - win->w) / 2;
325
326 tmp = img->w;
327 img->w = img->h;
328 img->h = tmp;
329
330 img->checkpan = 1;
331}
332
333void img_rotate_left(img_t *img, win_t *win) {
334 img_rotate(img, win, 3);
335}
336
337void img_rotate_right(img_t *img, win_t *win) {
338 img_rotate(img, win, 1);
339}
340
341void img_toggle_antialias(img_t *img) {
342 if (!img || !img->valid)
343 return;
344
345 img->aa ^= 1;
346 imlib_context_set_anti_alias(img->aa);
347}