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nsxivimage.c

335 lines · 6.5 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 <Imlib2.h>
20
21#include "config.h"
22#include "image.h"
23#include "options.h"
24#include "util.h"
25
26int zl_cnt;
27float zoom_min;
28float zoom_max;
29
30void img_init(img_t *img, win_t *win) {
31 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
32 zoom_min = zoom_levels[0] / 100.0;
33 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
34
35 if (img) {
36 img->zoom = options->zoom;
37 img->zoom = MAX(img->zoom, zoom_min);
38 img->zoom = MIN(img->zoom, zoom_max);
39 img->aa = options->aa;
40 }
41
42 if (win) {
43 imlib_context_set_display(win->env.dpy);
44 imlib_context_set_visual(win->env.vis);
45 imlib_context_set_colormap(win->env.cmap);
46 }
47}
48
49void img_free(img_t* img) {
50 if (imlib_context_get_image())
51 imlib_free_image();
52}
53
54int _imlib_load_image(const char *filename) {
55 Imlib_Image *im;
56
57 if (!filename)
58 return 0;
59
60 if (!(im = imlib_load_image(filename))) {
61 warn("could not open file: %s", filename);
62 return 0;
63 }
64
65 imlib_context_set_image(im);
66 imlib_image_set_changes_on_disk();
67
68 return 1;
69}
70
71int img_check(const char *filename) {
72 int ret;
73
74 if ((ret = _imlib_load_image(filename)))
75 imlib_free_image();
76 return ret;
77}
78
79int img_load(img_t *img, const char *filename) {
80 if (!img || !filename)
81 return 0;
82
83 if (imlib_context_get_image())
84 imlib_free_image();
85
86 if (!_imlib_load_image(filename))
87 return 0;
88
89 imlib_context_set_anti_alias(img->aa);
90
91 img->scalemode = options->scalemode;
92 img->re = 0;
93 img->checkpan = 0;
94
95 img->w = imlib_image_get_width();
96 img->h = imlib_image_get_height();
97
98 return 1;
99}
100
101void img_check_pan(img_t *img, win_t *win) {
102 if (!img || !win)
103 return;
104
105 if (img->w * img->zoom > win->w) {
106 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
107 img->x = 0;
108 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
109 img->x = win->w - img->w * img->zoom;
110 } else {
111 img->x = (win->w - img->w * img->zoom) / 2;
112 }
113 if (img->h * img->zoom > win->h) {
114 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
115 img->y = 0;
116 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
117 img->y = win->h - img->h * img->zoom;
118 } else {
119 img->y = (win->h - img->h * img->zoom) / 2;
120 }
121}
122
123int img_fit(img_t *img, win_t *win) {
124 float oz, zw, zh;
125
126 if (!img || !win)
127 return 0;
128
129 oz = img->zoom;
130 zw = (float) win->w / (float) img->w;
131 zh = (float) win->h / (float) img->h;
132
133 img->zoom = MIN(zw, zh);
134 img->zoom = MAX(img->zoom, zoom_min);
135 img->zoom = MIN(img->zoom, zoom_max);
136
137 return oz != img->zoom;
138}
139
140void img_render(img_t *img, win_t *win) {
141 int sx, sy, sw, sh;
142 int dx, dy, dw, dh;
143
144 if (!img || !win || !imlib_context_get_image())
145 return;
146
147 if (img->scalemode != SCALE_ZOOM) {
148 img_fit(img, win);
149 if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
150 img->zoom = 1.0;
151 }
152
153 if (!img->re) {
154 /* rendered for the first time */
155 img->re = 1;
156 img_center(img, win);
157 }
158
159 if (img->checkpan) {
160 img_check_pan(img, win);
161 img->checkpan = 0;
162 }
163
164 /* calculate source and destination offsets */
165 if (img->x < 0) {
166 sx = -img->x / img->zoom;
167 sw = win->w / img->zoom;
168 dx = 0;
169 dw = win->w;
170 } else {
171 sx = 0;
172 sw = img->w;
173 dx = img->x;
174 dw = img->w * img->zoom;
175 }
176 if (img->y < 0) {
177 sy = -img->y / img->zoom;
178 sh = win->h / img->zoom;
179 dy = 0;
180 dh = win->h;
181 } else {
182 sy = 0;
183 sh = img->h;
184 dy = img->y;
185 dh = img->h * img->zoom;
186 }
187
188 win_clear(win);
189
190 imlib_context_set_drawable(win->pm);
191 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
192
193 win_draw(win);
194}
195
196int img_fit_win(img_t *img, win_t *win) {
197 if (!img || !win)
198 return 0;
199
200 img->scalemode = SCALE_FIT;
201 return img_fit(img, win);
202}
203
204int img_center(img_t *img, win_t *win) {
205 int ox, oy;
206
207 if (!img || !win)
208 return 0;
209
210 ox = img->x;
211 oy = img->y;
212
213 img->x = (win->w - img->w * img->zoom) / 2;
214 img->y = (win->h - img->h * img->zoom) / 2;
215
216 return ox != img->x || oy != img->y;
217}
218
219int img_zoom(img_t *img, float z) {
220 if (!img)
221 return 0;
222
223 z = MAX(z, zoom_min);
224 z = MIN(z, zoom_max);
225
226 img->scalemode = SCALE_ZOOM;
227
228 if (z != img->zoom) {
229 img->x -= (img->w * z - img->w * img->zoom) / 2;
230 img->y -= (img->h * z - img->h * img->zoom) / 2;
231 img->zoom = z;
232 img->checkpan = 1;
233 return 1;
234 } else {
235 return 0;
236 }
237}
238
239int img_zoom_in(img_t *img) {
240 int i;
241
242 if (!img)
243 return 0;
244
245 for (i = 1; i < zl_cnt; ++i) {
246 if (zoom_levels[i] > img->zoom * 100.0)
247 return img_zoom(img, zoom_levels[i] / 100.0);
248 }
249 return 0;
250}
251
252int img_zoom_out(img_t *img) {
253 int i;
254
255 if (!img)
256 return 0;
257
258 for (i = zl_cnt - 2; i >= 0; --i) {
259 if (zoom_levels[i] < img->zoom * 100.0)
260 return img_zoom(img, zoom_levels[i] / 100.0);
261 }
262 return 0;
263}
264
265int img_move(img_t *img, win_t *win, int dx, int dy) {
266 int ox, oy;
267
268 if (!img || !win)
269 return 0;
270
271 ox = img->x;
272 oy = img->y;
273
274 img->x += dx;
275 img->y += dy;
276
277 img_check_pan(img, win);
278
279 return ox != img->x || oy != img->y;
280}
281
282int img_pan(img_t *img, win_t *win, pandir_t dir) {
283 if (!img || !win)
284 return 0;
285
286 switch (dir) {
287 case PAN_LEFT:
288 return img_move(img, win, win->w / 5, 0);
289 case PAN_RIGHT:
290 return img_move(img, win, win->w / 5 * -1, 0);
291 case PAN_UP:
292 return img_move(img, win, 0, win->h / 5);
293 case PAN_DOWN:
294 return img_move(img, win, 0, win->h / 5 * -1);
295 }
296
297 return 0;
298}
299
300void img_rotate(img_t *img, win_t *win, int d) {
301 int ox, oy, tmp;
302
303 if (!img || !win)
304 return;
305
306 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
307 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
308
309 imlib_image_orientate(d);
310
311 img->x = oy + (win->w - win->h) / 2;
312 img->y = ox + (win->h - win->w) / 2;
313
314 tmp = img->w;
315 img->w = img->h;
316 img->h = tmp;
317
318 img->checkpan = 1;
319}
320
321void img_rotate_left(img_t *img, win_t *win) {
322 img_rotate(img, win, 3);
323}
324
325void img_rotate_right(img_t *img, win_t *win) {
326 img_rotate(img, win, 1);
327}
328
329void img_toggle_antialias(img_t *img) {
330 if (!img)
331 return;
332
333 img->aa ^= 1;
334 imlib_context_set_anti_alias(img->aa);
335}