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nsxivimage.c

344 lines · 6.9 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
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->zoom = options->zoom;
39 img->zoom = MAX(img->zoom, zoom_min);
40 img->zoom = MIN(img->zoom, zoom_max);
41 img->aa = options->aa;
42 }
43
44 if (win) {
45 imlib_context_set_display(win->env.dpy);
46 imlib_context_set_visual(win->env.vis);
47 imlib_context_set_colormap(win->env.cmap);
48 }
49}
50
51void img_free(img_t* img) {
52 if (imlib_context_get_image())
53 imlib_free_image();
54}
55
56int _imlib_load_image(const char *filename) {
57 Imlib_Image *im;
58
59 if (!filename)
60 return 0;
61
62 if (access(filename, F_OK) || !(im = imlib_load_image(filename))) {
63 warn("could not open file: %s", filename);
64 return 0;
65 }
66
67 imlib_context_set_image(im);
68 imlib_image_set_changes_on_disk();
69
70 return 1;
71}
72
73int img_check(const char *filename) {
74 int ret;
75
76 if ((ret = _imlib_load_image(filename)))
77 imlib_free_image();
78 return ret;
79}
80
81int img_load(img_t *img, const char *filename) {
82 Imlib_Image *im_warn;
83
84 if (!img || !filename)
85 return 0;
86
87 if (imlib_context_get_image())
88 imlib_free_image();
89
90 if ((img->valid = _imlib_load_image(filename))) {
91 imlib_context_set_anti_alias(img->aa);
92 img->scalemode = options->scalemode;
93 } else {
94 im_warn = imlib_create_image_using_data(32, 32, icon_warn);
95 imlib_context_set_image(im_warn);
96 imlib_image_set_has_alpha(1);
97 imlib_context_set_anti_alias(0);
98 img->scalemode = SCALE_DOWN;
99 }
100
101 img->re = 0;
102 img->checkpan = 0;
103
104 img->w = imlib_image_get_width();
105 img->h = imlib_image_get_height();
106
107 return 1;
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 || !imlib_context_get_image())
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 imlib_context_set_drawable(win->pm);
200 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
201
202 win_draw(win);
203}
204
205int img_fit_win(img_t *img, win_t *win) {
206 if (!img || !img->valid || !win)
207 return 0;
208
209 img->scalemode = SCALE_FIT;
210 return img_fit(img, win);
211}
212
213int img_center(img_t *img, win_t *win) {
214 int ox, oy;
215
216 if (!img || !win)
217 return 0;
218
219 ox = img->x;
220 oy = img->y;
221
222 img->x = (win->w - img->w * img->zoom) / 2;
223 img->y = (win->h - img->h * img->zoom) / 2;
224
225 return ox != img->x || oy != img->y;
226}
227
228int img_zoom(img_t *img, float z) {
229 if (!img || !img->valid)
230 return 0;
231
232 z = MAX(z, zoom_min);
233 z = MIN(z, zoom_max);
234
235 img->scalemode = SCALE_ZOOM;
236
237 if (z != img->zoom) {
238 img->x -= (img->w * z - img->w * img->zoom) / 2;
239 img->y -= (img->h * z - img->h * img->zoom) / 2;
240 img->zoom = z;
241 img->checkpan = 1;
242 return 1;
243 } else {
244 return 0;
245 }
246}
247
248int img_zoom_in(img_t *img) {
249 int i;
250
251 if (!img || !img->valid)
252 return 0;
253
254 for (i = 1; i < zl_cnt; ++i) {
255 if (zoom_levels[i] > img->zoom * 100.0)
256 return img_zoom(img, zoom_levels[i] / 100.0);
257 }
258 return 0;
259}
260
261int img_zoom_out(img_t *img) {
262 int i;
263
264 if (!img || !img->valid)
265 return 0;
266
267 for (i = zl_cnt - 2; i >= 0; --i) {
268 if (zoom_levels[i] < img->zoom * 100.0)
269 return img_zoom(img, zoom_levels[i] / 100.0);
270 }
271 return 0;
272}
273
274int img_move(img_t *img, win_t *win, int dx, int dy) {
275 int ox, oy;
276
277 if (!img || !img->valid || !win)
278 return 0;
279
280 ox = img->x;
281 oy = img->y;
282
283 img->x += dx;
284 img->y += dy;
285
286 img_check_pan(img, win);
287
288 return ox != img->x || oy != img->y;
289}
290
291int img_pan(img_t *img, win_t *win, pandir_t dir) {
292 if (!img || !img->valid || !win)
293 return 0;
294
295 switch (dir) {
296 case PAN_LEFT:
297 return img_move(img, win, win->w / 5, 0);
298 case PAN_RIGHT:
299 return img_move(img, win, win->w / 5 * -1, 0);
300 case PAN_UP:
301 return img_move(img, win, 0, win->h / 5);
302 case PAN_DOWN:
303 return img_move(img, win, 0, win->h / 5 * -1);
304 }
305
306 return 0;
307}
308
309void img_rotate(img_t *img, win_t *win, int d) {
310 int ox, oy, tmp;
311
312 if (!img || !img->valid || !win)
313 return;
314
315 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
316 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
317
318 imlib_image_orientate(d);
319
320 img->x = oy + (win->w - win->h) / 2;
321 img->y = ox + (win->h - win->w) / 2;
322
323 tmp = img->w;
324 img->w = img->h;
325 img->h = tmp;
326
327 img->checkpan = 1;
328}
329
330void img_rotate_left(img_t *img, win_t *win) {
331 img_rotate(img, win, 3);
332}
333
334void img_rotate_right(img_t *img, win_t *win) {
335 img_rotate(img, win, 1);
336}
337
338void img_toggle_antialias(img_t *img) {
339 if (!img || !img->valid)
340 return;
341
342 img->aa ^= 1;
343 imlib_context_set_anti_alias(img->aa);
344}