Krolyxon
Commit 12a94cc

Branches

Refs →

nsxivimage.c

326 lines · 6.3 KB · C

Raw Blame History Download
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
77 return ret;
78}
79
80int img_load(img_t *img, const char *filename) {
81 if (!img || !filename)
82 return 0;
83
84 if (imlib_context_get_image())
85 imlib_free_image();
86
87 if (!_imlib_load_image(filename))
88 return 0;
89
90 imlib_context_set_anti_alias(img->aa);
91
92 img->re = 0;
93 img->checkpan = 0;
94 img->zoomed = 0;
95
96 img->w = imlib_image_get_width();
97 img->h = imlib_image_get_height();
98
99 return 1;
100}
101
102void img_check_pan(img_t *img, win_t *win) {
103 if (!img)
104 return;
105
106 if (img->w * img->zoom > win->w) {
107 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
108 img->x = 0;
109 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
110 img->x = win->w - img->w * img->zoom;
111 } else {
112 img->x = (win->w - img->w * img->zoom) / 2;
113 }
114 if (img->h * img->zoom > win->h) {
115 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
116 img->y = 0;
117 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
118 img->y = win->h - img->h * img->zoom;
119 } else {
120 img->y = (win->h - img->h * img->zoom) / 2;
121 }
122}
123
124void img_render(img_t *img, win_t *win) {
125 int sx, sy, sw, sh;
126 int dx, dy, dw, dh;
127
128 if (!img || !win || !imlib_context_get_image())
129 return;
130
131 if (!img->zoomed && options->scalemode != SCALE_ZOOM) {
132 img_fit(img, win);
133 if (options->scalemode == SCALE_DOWN && img->zoom > 1.0)
134 img->zoom = 1.0;
135 }
136
137 if (!img->re) {
138 /* rendered for the first time */
139 img->re = 1;
140 img_center(img, win);
141 }
142
143 if (img->checkpan) {
144 img_check_pan(img, win);
145 img->checkpan = 0;
146 }
147
148 /* calculate source and destination offsets */
149 if (img->x < 0) {
150 sx = -img->x / img->zoom;
151 sw = win->w / img->zoom;
152 dx = 0;
153 dw = win->w;
154 } else {
155 sx = 0;
156 sw = img->w;
157 dx = img->x;
158 dw = img->w * img->zoom;
159 }
160 if (img->y < 0) {
161 sy = -img->y / img->zoom;
162 sh = win->h / img->zoom;
163 dy = 0;
164 dh = win->h;
165 } else {
166 sy = 0;
167 sh = img->h;
168 dy = img->y;
169 dh = img->h * img->zoom;
170 }
171
172 win_clear(win);
173
174 imlib_context_set_drawable(win->pm);
175 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
176
177 win_draw(win);
178}
179
180int img_fit(img_t *img, win_t *win) {
181 float oz, zw, zh;
182
183 if (!img || !win)
184 return 0;
185
186 oz = img->zoom;
187 zw = (float) win->w / (float) img->w;
188 zh = (float) win->h / (float) img->h;
189
190 img->zoom = MIN(zw, zh);
191 img->zoom = MAX(img->zoom, zoom_min);
192 img->zoom = MIN(img->zoom, zoom_max);
193
194 return oz != img->zoom;
195}
196
197void img_center(img_t *img, win_t *win) {
198 if (!img || !win)
199 return;
200
201 img->x = (win->w - img->w * img->zoom) / 2;
202 img->y = (win->h - img->h * img->zoom) / 2;
203}
204
205int img_zoom(img_t *img, float z) {
206 if (!img)
207 return 0;
208
209 z = MAX(z, zoom_min);
210 z = MIN(z, zoom_max);
211
212 if (z != img->zoom) {
213 img->x -= (img->w * z - img->w * img->zoom) / 2;
214 img->y -= (img->h * z - img->h * img->zoom) / 2;
215 img->zoom = z;
216 img->checkpan = 1;
217 img->zoomed = 1;
218 return 1;
219 } else {
220 return 0;
221 }
222}
223
224int img_zoom_in(img_t *img) {
225 int i;
226
227 if (!img)
228 return 0;
229
230 for (i = 1; i < zl_cnt; ++i) {
231 if (zoom_levels[i] > img->zoom * 100.0)
232 return img_zoom(img, zoom_levels[i] / 100.0);
233 }
234
235 return 0;
236}
237
238int img_zoom_out(img_t *img) {
239 int i;
240
241 if (!img)
242 return 0;
243
244 for (i = zl_cnt - 2; i >= 0; --i) {
245 if (zoom_levels[i] < img->zoom * 100.0)
246 return img_zoom(img, zoom_levels[i] / 100.0);
247 }
248
249 return 0;
250}
251
252int img_move(img_t *img, win_t *win, int dx, int dy) {
253 int ox, oy;
254
255 if (!img || !win)
256 return 0;
257
258 ox = img->x;
259 oy = img->y;
260
261 img->x += dx;
262 img->y += dy;
263
264 img_check_pan(img, win);
265
266 return ox != img->x || oy != img->y;
267}
268
269int img_pan(img_t *img, win_t *win, pandir_t dir) {
270 if (!img || !win)
271 return 0;
272
273 switch (dir) {
274 case PAN_LEFT:
275 return img_move(img, win, win->w / 5, 0);
276 case PAN_RIGHT:
277 return img_move(img, win, win->w / 5 * -1, 0);
278 case PAN_UP:
279 return img_move(img, win, 0, win->h / 5);
280 case PAN_DOWN:
281 return img_move(img, win, 0, win->h / 5 * -1);
282 }
283
284 return 0;
285}
286
287int img_rotate(img_t *img, win_t *win, int d) {
288 int ox, oy, tmp;
289
290 if (!img || !win)
291 return 0;
292
293 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
294 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
295
296 imlib_image_orientate(d);
297
298 img->x = oy + (win->w - win->h) / 2;
299 img->y = ox + (win->h - win->w) / 2;
300
301 tmp = img->w;
302 img->w = img->h;
303 img->h = tmp;
304
305 img->checkpan = 1;
306
307 return 1;
308}
309
310int img_rotate_left(img_t *img, win_t *win) {
311 return img_rotate(img, win, 3);
312}
313
314int img_rotate_right(img_t *img, win_t *win) {
315 return img_rotate(img, win, 1);
316}
317
318int img_toggle_antialias(img_t *img) {
319 if (!img)
320 return 0;
321
322 img->aa ^= 1;
323 imlib_context_set_anti_alias(img->aa);
324
325 return 1;
326}