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nsxivimage.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
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (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., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301, USA.
17 */
18
19#define _IMAGE_CONFIG
20
21#include <unistd.h>
22
23#include "image.h"
24#include "options.h"
25#include "util.h"
26#include "config.h"
27
28int zl_cnt;
29float zoom_min;
30float zoom_max;
31
32void img_init(img_t *img, win_t *win) {
33 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
34 zoom_min = zoom_levels[0] / 100.0;
35 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
36
37 if (img) {
38 img->im = NULL;
39 img->zoom = options->zoom;
40 img->zoom = MAX(img->zoom, zoom_min);
41 img->zoom = MIN(img->zoom, zoom_max);
42 img->aa = options->aa;
43 img->alpha = 1;
44 }
45
46 if (win) {
47 imlib_context_set_display(win->env.dpy);
48 imlib_context_set_visual(win->env.vis);
49 imlib_context_set_colormap(win->env.cmap);
50 }
51}
52
53int img_load(img_t *img, const fileinfo_t *file) {
54 if (!img || !file || !file->name || !file->path)
55 return 0;
56
57 if (access(file->path, R_OK) || !(img->im = imlib_load_image(file->path))) {
58 warn("could not open image: %s", file->name);
59 return 0;
60 }
61
62 imlib_context_set_image(img->im);
63 imlib_image_set_changes_on_disk();
64 imlib_context_set_anti_alias(img->aa);
65
66 img->scalemode = options->scalemode;
67 img->re = 0;
68 img->checkpan = 0;
69
70 img->w = imlib_image_get_width();
71 img->h = imlib_image_get_height();
72
73 return 1;
74}
75
76void img_close(img_t *img, int decache) {
77 if (img && img->im) {
78 imlib_context_set_image(img->im);
79 if (decache)
80 imlib_free_image_and_decache();
81 else
82 imlib_free_image();
83 img->im = NULL;
84 }
85}
86
87void img_check_pan(img_t *img, win_t *win) {
88 if (!img || !win)
89 return;
90
91 if (img->w * img->zoom > win->w) {
92 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
93 img->x = 0;
94 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
95 img->x = win->w - img->w * img->zoom;
96 } else {
97 img->x = (win->w - img->w * img->zoom) / 2;
98 }
99 if (img->h * img->zoom > win->h) {
100 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
101 img->y = 0;
102 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
103 img->y = win->h - img->h * img->zoom;
104 } else {
105 img->y = (win->h - img->h * img->zoom) / 2;
106 }
107}
108
109int img_fit(img_t *img, win_t *win) {
110 float oz, zw, zh;
111
112 if (!img || !win)
113 return 0;
114
115 oz = img->zoom;
116 zw = (float) win->w / (float) img->w;
117 zh = (float) win->h / (float) img->h;
118
119 img->zoom = MIN(zw, zh);
120 img->zoom = MAX(img->zoom, zoom_min);
121 img->zoom = MIN(img->zoom, zoom_max);
122
123 return oz != img->zoom;
124}
125
126void img_render(img_t *img, win_t *win) {
127 int sx, sy, sw, sh;
128 int dx, dy, dw, dh;
129
130 if (!img || !img->im || !win)
131 return;
132
133 if (img->scalemode != SCALE_ZOOM) {
134 img_fit(img, win);
135 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
136 img->zoom = 1.0;
137 }
138
139 if (!img->re) {
140 /* rendered for the first time */
141 img->re = 1;
142 if (img->zoom * img->w <= win->w)
143 img->x = (win->w - img->w * img->zoom) / 2;
144 else
145 img->x = 0;
146 if (img->zoom * img->h <= win->h)
147 img->y = (win->h - img->h * img->zoom) / 2;
148 else
149 img->y = 0;
150 }
151
152 if (img->checkpan) {
153 img_check_pan(img, win);
154 img->checkpan = 0;
155 }
156
157 /* calculate source and destination offsets */
158 if (img->x < 0) {
159 sx = -img->x / img->zoom;
160 sw = win->w / img->zoom;
161 dx = 0;
162 dw = win->w;
163 } else {
164 sx = 0;
165 sw = img->w;
166 dx = img->x;
167 dw = img->w * img->zoom;
168 }
169 if (img->y < 0) {
170 sy = -img->y / img->zoom;
171 sh = win->h / img->zoom;
172 dy = 0;
173 dh = win->h;
174 } else {
175 sy = 0;
176 sh = img->h;
177 dy = img->y;
178 dh = img->h * img->zoom;
179 }
180
181 win_clear(win);
182
183 imlib_context_set_image(img->im);
184
185 if (imlib_image_has_alpha() && !img->alpha)
186 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
187
188 imlib_context_set_drawable(win->pm);
189 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
190
191 win_draw(win);
192}
193
194int img_fit_win(img_t *img, win_t *win) {
195 if (!img || !img->im || !win)
196 return 0;
197
198 img->scalemode = SCALE_FIT;
199 return img_fit(img, win);
200}
201
202int img_center(img_t *img, win_t *win) {
203 int ox, oy;
204
205 if (!img || !win)
206 return 0;
207
208 ox = img->x;
209 oy = img->y;
210
211 img->x = (win->w - img->w * img->zoom) / 2;
212 img->y = (win->h - img->h * img->zoom) / 2;
213
214 return ox != img->x || oy != img->y;
215}
216
217int img_zoom(img_t *img, win_t *win, float z) {
218 if (!img || !img->im || !win)
219 return 0;
220
221 z = MAX(z, zoom_min);
222 z = MIN(z, zoom_max);
223
224 img->scalemode = SCALE_ZOOM;
225
226 if (z != img->zoom) {
227 img->x = win->w / 2 - (win->w / 2 - img->x) * z / img->zoom;
228 img->y = win->h / 2 - (win->h / 2 - img->y) * z / img->zoom;
229 img->zoom = z;
230 img->checkpan = 1;
231 return 1;
232 } else {
233 return 0;
234 }
235}
236
237int img_zoom_in(img_t *img, win_t *win) {
238 int i;
239
240 if (!img || !img->im || !win)
241 return 0;
242
243 for (i = 1; i < zl_cnt; i++) {
244 if (zoom_levels[i] > img->zoom * 100.0)
245 return img_zoom(img, win, zoom_levels[i] / 100.0);
246 }
247 return 0;
248}
249
250int img_zoom_out(img_t *img, win_t *win) {
251 int i;
252
253 if (!img || !img->im || !win)
254 return 0;
255
256 for (i = zl_cnt - 2; i >= 0; i--) {
257 if (zoom_levels[i] < img->zoom * 100.0)
258 return img_zoom(img, win, zoom_levels[i] / 100.0);
259 }
260 return 0;
261}
262
263int img_move(img_t *img, win_t *win, int dx, int dy) {
264 int ox, oy;
265
266 if (!img || !img->im || !win)
267 return 0;
268
269 ox = img->x;
270 oy = img->y;
271
272 img->x += dx;
273 img->y += dy;
274
275 img_check_pan(img, win);
276
277 return ox != img->x || oy != img->y;
278}
279
280int img_pan(img_t *img, win_t *win, direction_t dir, int screen) {
281 if (!img || !img->im || !win)
282 return 0;
283
284 switch (dir) {
285 case DIR_LEFT:
286 return img_move(img, win, win->w / (screen ? 1 : 5), 0);
287 case DIR_RIGHT:
288 return img_move(img, win, win->w / (screen ? 1 : 5) * -1, 0);
289 case DIR_UP:
290 return img_move(img, win, 0, win->h / (screen ? 1 : 5));
291 case DIR_DOWN:
292 return img_move(img, win, 0, win->h / (screen ? 1 : 5) * -1);
293 }
294
295 return 0;
296}
297
298int img_pan_edge(img_t *img, win_t *win, direction_t dir) {
299 int ox, oy;
300
301 if (!img || !img->im || !win)
302 return 0;
303
304 ox = img->x;
305 oy = img->y;
306
307 switch (dir) {
308 case DIR_LEFT:
309 img->x = 0;
310 break;
311 case DIR_RIGHT:
312 img->x = win->w - img->w * img->zoom;
313 break;
314 case DIR_UP:
315 img->y = 0;
316 break;
317 case DIR_DOWN:
318 img->y = win->h - img->h * img->zoom;
319 break;
320 }
321
322 img_check_pan(img, win);
323
324 return ox != img->x || oy != img->y;
325}
326
327void img_rotate(img_t *img, win_t *win, int d) {
328 int ox, oy, tmp;
329
330 if (!img || !img->im || !win)
331 return;
332
333 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
334 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
335
336 imlib_context_set_image(img->im);
337 imlib_image_orientate(d);
338
339 img->x = oy + (win->w - win->h) / 2;
340 img->y = ox + (win->h - win->w) / 2;
341
342 tmp = img->w;
343 img->w = img->h;
344 img->h = tmp;
345
346 img->checkpan = 1;
347}
348
349void img_rotate_left(img_t *img, win_t *win) {
350 img_rotate(img, win, 3);
351}
352
353void img_rotate_right(img_t *img, win_t *win) {
354 img_rotate(img, win, 1);
355}
356
357void img_toggle_antialias(img_t *img) {
358 if (img && img->im) {
359 img->aa ^= 1;
360 imlib_context_set_image(img->im);
361 imlib_context_set_anti_alias(img->aa);
362 }
363}