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nsxivimage.c

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