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nsxivimage.c

327 lines · 6.3 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 <stdlib.h>
20#include <stdio.h>
21
22#include <Imlib2.h>
23
24#include "sxiv.h"
25#include "image.h"
26
27int zl_cnt;
28float zoom_min;
29float zoom_max;
30
31void img_init(img_t *img, win_t *win) {
32 zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
33 zoom_min = zoom_levels[0] / 100.0;
34 zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
35
36 if (img) {
37 img->zoom = options->zoom;
38 img->zoom = MAX(img->zoom, zoom_min);
39 img->zoom = MIN(img->zoom, zoom_max);
40 img->aa = options->aa;
41 }
42
43 if (win) {
44 imlib_context_set_display(win->env.dpy);
45 imlib_context_set_visual(win->env.vis);
46 imlib_context_set_colormap(win->env.cmap);
47 }
48}
49
50void img_free(img_t* img) {
51 if (imlib_context_get_image())
52 imlib_free_image();
53}
54
55int _imlib_load_image(const char *filename) {
56 Imlib_Image *im;
57
58 if (!filename)
59 return 0;
60
61 if (!(im = imlib_load_image(filename))) {
62 WARN("could not open image: %s", filename);
63 return 0;
64 }
65
66 imlib_context_set_image(im);
67 imlib_image_set_changes_on_disk();
68
69 return 1;
70}
71
72int img_check(const char *filename) {
73 int ret;
74
75 if ((ret = _imlib_load_image(filename)))
76 imlib_free_image();
77
78 return ret;
79}
80
81int img_load(img_t *img, const char *filename) {
82 if (!img || !filename)
83 return 0;
84
85 if (imlib_context_get_image())
86 imlib_free_image();
87
88 if (!_imlib_load_image(filename))
89 return 0;
90
91 imlib_context_set_anti_alias(img->aa);
92
93 img->re = 0;
94 img->checkpan = 0;
95 img->zoomed = 0;
96
97 img->w = imlib_image_get_width();
98 img->h = imlib_image_get_height();
99
100 return 1;
101}
102
103void img_check_pan(img_t *img, win_t *win) {
104 if (!img)
105 return;
106
107 if (img->w * img->zoom > win->w) {
108 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
109 img->x = 0;
110 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
111 img->x = win->w - img->w * img->zoom;
112 } else {
113 img->x = (win->w - img->w * img->zoom) / 2;
114 }
115 if (img->h * img->zoom > win->h) {
116 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
117 img->y = 0;
118 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
119 img->y = win->h - img->h * img->zoom;
120 } else {
121 img->y = (win->h - img->h * img->zoom) / 2;
122 }
123}
124
125void img_render(img_t *img, win_t *win) {
126 int sx, sy, sw, sh;
127 int dx, dy, dw, dh;
128
129 if (!img || !win || !imlib_context_get_image())
130 return;
131
132 if (!img->zoomed && options->scalemode != SCALE_ZOOM) {
133 img_fit(img, win);
134 if (options->scalemode == SCALE_DOWN && img->zoom > 1.0)
135 img->zoom = 1.0;
136 }
137
138 if (!img->re) {
139 /* rendered for the first time */
140 img->re = 1;
141 img_center(img, win);
142 }
143
144 if (img->checkpan) {
145 img_check_pan(img, win);
146 img->checkpan = 0;
147 }
148
149 /* calculate source and destination offsets */
150 if (img->x < 0) {
151 sx = -img->x / img->zoom;
152 sw = win->w / img->zoom;
153 dx = 0;
154 dw = win->w;
155 } else {
156 sx = 0;
157 sw = img->w;
158 dx = img->x;
159 dw = img->w * img->zoom;
160 }
161 if (img->y < 0) {
162 sy = -img->y / img->zoom;
163 sh = win->h / img->zoom;
164 dy = 0;
165 dh = win->h;
166 } else {
167 sy = 0;
168 sh = img->h;
169 dy = img->y;
170 dh = img->h * img->zoom;
171 }
172
173 win_clear(win);
174
175 imlib_context_set_drawable(win->pm);
176 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
177
178 win_draw(win);
179}
180
181int img_fit(img_t *img, win_t *win) {
182 float oz, zw, zh;
183
184 if (!img || !win)
185 return 0;
186
187 oz = img->zoom;
188 zw = (float) win->w / (float) img->w;
189 zh = (float) win->h / (float) img->h;
190
191 img->zoom = MIN(zw, zh);
192 img->zoom = MAX(img->zoom, zoom_min);
193 img->zoom = MIN(img->zoom, zoom_max);
194
195 return oz != img->zoom;
196}
197
198void img_center(img_t *img, win_t *win) {
199 if (!img || !win)
200 return;
201
202 img->x = (win->w - img->w * img->zoom) / 2;
203 img->y = (win->h - img->h * img->zoom) / 2;
204}
205
206int img_zoom(img_t *img, float z) {
207 if (!img)
208 return 0;
209
210 z = MAX(z, zoom_min);
211 z = MIN(z, zoom_max);
212
213 if (z != img->zoom) {
214 img->x -= (img->w * z - img->w * img->zoom) / 2;
215 img->y -= (img->h * z - img->h * img->zoom) / 2;
216 img->zoom = z;
217 img->checkpan = 1;
218 img->zoomed = 1;
219 return 1;
220 } else {
221 return 0;
222 }
223}
224
225int img_zoom_in(img_t *img) {
226 int i;
227
228 if (!img)
229 return 0;
230
231 for (i = 1; i < zl_cnt; ++i) {
232 if (zoom_levels[i] > img->zoom * 100.0)
233 return img_zoom(img, zoom_levels[i] / 100.0);
234 }
235
236 return 0;
237}
238
239int img_zoom_out(img_t *img) {
240 int i;
241
242 if (!img)
243 return 0;
244
245 for (i = zl_cnt - 2; i >= 0; --i) {
246 if (zoom_levels[i] < img->zoom * 100.0)
247 return img_zoom(img, zoom_levels[i] / 100.0);
248 }
249
250 return 0;
251}
252
253int img_move(img_t *img, win_t *win, int dx, int dy) {
254 int ox, oy;
255
256 if (!img || !win)
257 return 0;
258
259 ox = img->x;
260 oy = img->y;
261
262 img->x += dx;
263 img->y += dy;
264
265 img_check_pan(img, win);
266
267 return ox != img->x || oy != img->y;
268}
269
270int img_pan(img_t *img, win_t *win, pandir_t dir) {
271 if (!img || !win)
272 return 0;
273
274 switch (dir) {
275 case PAN_LEFT:
276 return img_move(img, win, win->w / 5, 0);
277 case PAN_RIGHT:
278 return img_move(img, win, win->w / 5 * -1, 0);
279 case PAN_UP:
280 return img_move(img, win, 0, win->h / 5);
281 case PAN_DOWN:
282 return img_move(img, win, 0, win->h / 5 * -1);
283 }
284
285 return 0;
286}
287
288int img_rotate(img_t *img, win_t *win, int d) {
289 int ox, oy, tmp;
290
291 if (!img || !win)
292 return 0;
293
294 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
295 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
296
297 imlib_image_orientate(d);
298
299 img->x = oy + (win->w - win->h) / 2;
300 img->y = ox + (win->h - win->w) / 2;
301
302 tmp = img->w;
303 img->w = img->h;
304 img->h = tmp;
305
306 img->checkpan = 1;
307
308 return 1;
309}
310
311int img_rotate_left(img_t *img, win_t *win) {
312 return img_rotate(img, win, 3);
313}
314
315int img_rotate_right(img_t *img, win_t *win) {
316 return img_rotate(img, win, 1);
317}
318
319int img_toggle_antialias(img_t *img) {
320 if (!img)
321 return 0;
322
323 img->aa ^= 1;
324 imlib_context_set_anti_alias(img->aa);
325
326 return 1;
327}