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nsxivimage.c

350 lines · 7.1 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) {
103 if (img && img->im) {
104 imlib_context_set_image(img->im);
105 imlib_free_image();
106 img->im = NULL;
107 }
108}
109
110void img_check_pan(img_t *img, win_t *win) {
111 if (!img || !win)
112 return;
113
114 if (img->w * img->zoom > win->w) {
115 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
116 img->x = 0;
117 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
118 img->x = win->w - img->w * img->zoom;
119 } else {
120 img->x = (win->w - img->w * img->zoom) / 2;
121 }
122 if (img->h * img->zoom > win->h) {
123 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
124 img->y = 0;
125 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
126 img->y = win->h - img->h * img->zoom;
127 } else {
128 img->y = (win->h - img->h * img->zoom) / 2;
129 }
130}
131
132int img_fit(img_t *img, win_t *win) {
133 float oz, zw, zh;
134
135 if (!img || !win)
136 return 0;
137
138 oz = img->zoom;
139 zw = (float) win->w / (float) img->w;
140 zh = (float) win->h / (float) img->h;
141
142 img->zoom = MIN(zw, zh);
143 img->zoom = MAX(img->zoom, zoom_min);
144 img->zoom = MIN(img->zoom, zoom_max);
145
146 return oz != img->zoom;
147}
148
149void img_render(img_t *img, win_t *win) {
150 int sx, sy, sw, sh;
151 int dx, dy, dw, dh;
152
153 if (!img || !win)
154 return;
155
156 if (img->scalemode != SCALE_ZOOM) {
157 img_fit(img, win);
158 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
159 img->zoom = 1.0;
160 }
161
162 if (!img->re) {
163 /* rendered for the first time */
164 img->re = 1;
165 img_center(img, win);
166 }
167
168 if (img->checkpan) {
169 img_check_pan(img, win);
170 img->checkpan = 0;
171 }
172
173 /* calculate source and destination offsets */
174 if (img->x < 0) {
175 sx = -img->x / img->zoom;
176 sw = win->w / img->zoom;
177 dx = 0;
178 dw = win->w;
179 } else {
180 sx = 0;
181 sw = img->w;
182 dx = img->x;
183 dw = img->w * img->zoom;
184 }
185 if (img->y < 0) {
186 sy = -img->y / img->zoom;
187 sh = win->h / img->zoom;
188 dy = 0;
189 dh = win->h;
190 } else {
191 sy = 0;
192 sh = img->h;
193 dy = img->y;
194 dh = img->h * img->zoom;
195 }
196
197 win_clear(win);
198
199 if (img->im)
200 imlib_context_set_image(img->im);
201 else
202 imlib_context_set_image(im_broken);
203
204 imlib_context_set_drawable(win->pm);
205 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
206
207 win_draw(win);
208}
209
210int img_fit_win(img_t *img, win_t *win) {
211 if (!img || !img->im || !win)
212 return 0;
213
214 img->scalemode = SCALE_FIT;
215 return img_fit(img, win);
216}
217
218int img_center(img_t *img, win_t *win) {
219 int ox, oy;
220
221 if (!img || !win)
222 return 0;
223
224 ox = img->x;
225 oy = img->y;
226
227 img->x = (win->w - img->w * img->zoom) / 2;
228 img->y = (win->h - img->h * img->zoom) / 2;
229
230 return ox != img->x || oy != img->y;
231}
232
233int img_zoom(img_t *img, float z) {
234 if (!img || !img->im)
235 return 0;
236
237 z = MAX(z, zoom_min);
238 z = MIN(z, zoom_max);
239
240 img->scalemode = SCALE_ZOOM;
241
242 if (z != img->zoom) {
243 img->x -= (img->w * z - img->w * img->zoom) / 2;
244 img->y -= (img->h * z - img->h * img->zoom) / 2;
245 img->zoom = z;
246 img->checkpan = 1;
247 return 1;
248 } else {
249 return 0;
250 }
251}
252
253int img_zoom_in(img_t *img) {
254 int i;
255
256 if (!img || !img->im)
257 return 0;
258
259 for (i = 1; i < zl_cnt; ++i) {
260 if (zoom_levels[i] > img->zoom * 100.0)
261 return img_zoom(img, zoom_levels[i] / 100.0);
262 }
263 return 0;
264}
265
266int img_zoom_out(img_t *img) {
267 int i;
268
269 if (!img || !img->im)
270 return 0;
271
272 for (i = zl_cnt - 2; i >= 0; --i) {
273 if (zoom_levels[i] < img->zoom * 100.0)
274 return img_zoom(img, zoom_levels[i] / 100.0);
275 }
276 return 0;
277}
278
279int img_move(img_t *img, win_t *win, int dx, int dy) {
280 int ox, oy;
281
282 if (!img || !img->im || !win)
283 return 0;
284
285 ox = img->x;
286 oy = img->y;
287
288 img->x += dx;
289 img->y += dy;
290
291 img_check_pan(img, win);
292
293 return ox != img->x || oy != img->y;
294}
295
296int img_pan(img_t *img, win_t *win, pandir_t dir) {
297 if (!img || !img->im || !win)
298 return 0;
299
300 switch (dir) {
301 case PAN_LEFT:
302 return img_move(img, win, win->w / 5, 0);
303 case PAN_RIGHT:
304 return img_move(img, win, win->w / 5 * -1, 0);
305 case PAN_UP:
306 return img_move(img, win, 0, win->h / 5);
307 case PAN_DOWN:
308 return img_move(img, win, 0, win->h / 5 * -1);
309 }
310
311 return 0;
312}
313
314void img_rotate(img_t *img, win_t *win, int d) {
315 int ox, oy, tmp;
316
317 if (!img || !img->im || !win)
318 return;
319
320 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
321 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
322
323 imlib_context_set_image(img->im);
324 imlib_image_orientate(d);
325
326 img->x = oy + (win->w - win->h) / 2;
327 img->y = ox + (win->h - win->w) / 2;
328
329 tmp = img->w;
330 img->w = img->h;
331 img->h = tmp;
332
333 img->checkpan = 1;
334}
335
336void img_rotate_left(img_t *img, win_t *win) {
337 img_rotate(img, win, 3);
338}
339
340void img_rotate_right(img_t *img, win_t *win) {
341 img_rotate(img, win, 1);
342}
343
344void img_toggle_antialias(img_t *img) {
345 if (img && img->im) {
346 img->aa ^= 1;
347 imlib_context_set_image(img->im);
348 imlib_context_set_anti_alias(img->aa);
349 }
350}