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nsxivimage.c

326 lines · 6.4 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 image: %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->re = 0;
92 img->checkpan = 0;
93 img->zoomed = 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)
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
123void img_render(img_t *img, win_t *win) {
124 int sx, sy, sw, sh;
125 int dx, dy, dw, dh;
126
127 if (!img || !win || !imlib_context_get_image())
128 return;
129
130 if (!img->zoomed && options->scalemode != SCALE_ZOOM) {
131 img_fit(img, win);
132 if (options->scalemode == SCALE_DOWN && img->zoom > 1.0)
133 img->zoom = 1.0;
134 }
135
136 if (!img->re) {
137 /* rendered for the first time */
138 img->re = 1;
139 img_center(img, win);
140 }
141
142 if (img->checkpan) {
143 img_check_pan(img, win);
144 img->checkpan = 0;
145 }
146
147 /* calculate source and destination offsets */
148 if (img->x < 0) {
149 sx = -img->x / img->zoom;
150 sw = win->w / img->zoom;
151 dx = 0;
152 dw = win->w;
153 } else {
154 sx = 0;
155 sw = img->w;
156 dx = img->x;
157 dw = img->w * img->zoom;
158 }
159 if (img->y < 0) {
160 sy = -img->y / img->zoom;
161 sh = win->h / img->zoom;
162 dy = 0;
163 dh = win->h;
164 } else {
165 sy = 0;
166 sh = img->h;
167 dy = img->y;
168 dh = img->h * img->zoom;
169 }
170
171 win_clear(win);
172
173 imlib_context_set_drawable(win->pm);
174 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
175
176 win_draw(win);
177}
178
179int img_fit(img_t *img, win_t *win) {
180 float oz, zw, zh;
181
182 if (!img || !win)
183 return 0;
184
185 oz = img->zoom;
186 zw = (float) win->w / (float) img->w;
187 zh = (float) win->h / (float) img->h;
188
189 img->zoom = MIN(zw, zh);
190 img->zoom = MAX(img->zoom, zoom_min);
191 img->zoom = MIN(img->zoom, zoom_max);
192
193 return oz != img->zoom;
194}
195
196int img_center(img_t *img, win_t *win) {
197 int ox, oy;
198
199 if (!img || !win)
200 return 0;
201
202 ox = img->x;
203 oy = img->y;
204
205 img->x = (win->w - img->w * img->zoom) / 2;
206 img->y = (win->h - img->h * img->zoom) / 2;
207
208 return ox != img->x || oy != img->y;
209}
210
211int img_zoom(img_t *img, float z) {
212 if (!img)
213 return 0;
214
215 z = MAX(z, zoom_min);
216 z = MIN(z, zoom_max);
217
218 if (z != img->zoom) {
219 img->x -= (img->w * z - img->w * img->zoom) / 2;
220 img->y -= (img->h * z - img->h * img->zoom) / 2;
221 img->zoom = z;
222 img->checkpan = 1;
223 img->zoomed = 1;
224 return 1;
225 } else {
226 return 0;
227 }
228}
229
230int img_zoom_in(img_t *img) {
231 int i;
232
233 if (!img)
234 return 0;
235
236 for (i = 1; i < zl_cnt; ++i) {
237 if (zoom_levels[i] > img->zoom * 100.0)
238 return img_zoom(img, zoom_levels[i] / 100.0);
239 }
240 return 0;
241}
242
243int img_zoom_out(img_t *img) {
244 int i;
245
246 if (!img)
247 return 0;
248
249 for (i = zl_cnt - 2; i >= 0; --i) {
250 if (zoom_levels[i] < img->zoom * 100.0)
251 return img_zoom(img, zoom_levels[i] / 100.0);
252 }
253 return 0;
254}
255
256int img_move(img_t *img, win_t *win, int dx, int dy) {
257 int ox, oy;
258
259 if (!img || !win)
260 return 0;
261
262 ox = img->x;
263 oy = img->y;
264
265 img->x += dx;
266 img->y += dy;
267
268 img_check_pan(img, win);
269
270 return ox != img->x || oy != img->y;
271}
272
273int img_pan(img_t *img, win_t *win, pandir_t dir) {
274 if (!img || !win)
275 return 0;
276
277 switch (dir) {
278 case PAN_LEFT:
279 return img_move(img, win, win->w / 5, 0);
280 case PAN_RIGHT:
281 return img_move(img, win, win->w / 5 * -1, 0);
282 case PAN_UP:
283 return img_move(img, win, 0, win->h / 5);
284 case PAN_DOWN:
285 return img_move(img, win, 0, win->h / 5 * -1);
286 }
287
288 return 0;
289}
290
291void img_rotate(img_t *img, win_t *win, int d) {
292 int ox, oy, tmp;
293
294 if (!img || !win)
295 return;
296
297 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
298 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
299
300 imlib_image_orientate(d);
301
302 img->x = oy + (win->w - win->h) / 2;
303 img->y = ox + (win->h - win->w) / 2;
304
305 tmp = img->w;
306 img->w = img->h;
307 img->h = tmp;
308
309 img->checkpan = 1;
310}
311
312void img_rotate_left(img_t *img, win_t *win) {
313 img_rotate(img, win, 3);
314}
315
316void img_rotate_right(img_t *img, win_t *win) {
317 img_rotate(img, win, 1);
318}
319
320void img_toggle_antialias(img_t *img) {
321 if (!img)
322 return;
323
324 img->aa ^= 1;
325 imlib_context_set_anti_alias(img->aa);
326}