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nsxivimage.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 "config.h"
20#include "icon.h"
21#include "image.h"
22#include "options.h"
23#include "util.h"
24
25int zl_cnt;
26float zoom_min;
27float zoom_max;
28
29Imlib_Image *im_invalid;
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 im_invalid = imlib_create_image_using_data(32, 32, icon_invalid);
37
38 if (img) {
39 img->im = NULL;
40 img->zoom = options->zoom;
41 img->zoom = MAX(img->zoom, zoom_min);
42 img->zoom = MIN(img->zoom, zoom_max);
43 img->aa = options->aa;
44 img->alpha = 1;
45 }
46
47 if (win) {
48 imlib_context_set_display(win->env.dpy);
49 imlib_context_set_visual(win->env.vis);
50 imlib_context_set_colormap(win->env.cmap);
51 }
52}
53
54void img_free(img_t* img) {
55 imlib_context_set_image(im_invalid);
56 imlib_free_image();
57}
58
59int img_load(img_t *img, const char *filename) {
60 if (!img || !filename)
61 return 0;
62
63 if ((img->im = imlib_load_image(filename))) {
64 imlib_context_set_image(img->im);
65 imlib_image_set_changes_on_disk();
66 imlib_context_set_anti_alias(img->aa);
67 img->scalemode = options->scalemode;
68 } else {
69 warn("not an image: %s", filename);
70 imlib_context_set_image(im_invalid);
71 imlib_context_set_anti_alias(0);
72 }
73
74 img->re = 0;
75 img->checkpan = 0;
76
77 img->w = imlib_image_get_width();
78 img->h = imlib_image_get_height();
79
80 return 1;
81}
82
83void img_close(img_t *img, int decache) {
84 if (img && img->im) {
85 imlib_context_set_image(img->im);
86 if (decache)
87 imlib_free_image_and_decache();
88 else
89 imlib_free_image();
90 img->im = NULL;
91 }
92}
93
94void img_check_pan(img_t *img, win_t *win) {
95 if (!img || !win)
96 return;
97
98 if (img->w * img->zoom > win->w) {
99 if (img->x > 0 && img->x + img->w * img->zoom > win->w)
100 img->x = 0;
101 if (img->x < 0 && img->x + img->w * img->zoom < win->w)
102 img->x = win->w - img->w * img->zoom;
103 } else {
104 img->x = (win->w - img->w * img->zoom) / 2;
105 }
106 if (img->h * img->zoom > win->h) {
107 if (img->y > 0 && img->y + img->h * img->zoom > win->h)
108 img->y = 0;
109 if (img->y < 0 && img->y + img->h * img->zoom < win->h)
110 img->y = win->h - img->h * img->zoom;
111 } else {
112 img->y = (win->h - img->h * img->zoom) / 2;
113 }
114}
115
116int img_fit(img_t *img, win_t *win) {
117 float oz, zw, zh;
118
119 if (!img || !win)
120 return 0;
121
122 oz = img->zoom;
123 zw = (float) win->w / (float) img->w;
124 zh = (float) win->h / (float) img->h;
125
126 img->zoom = MIN(zw, zh);
127 img->zoom = MAX(img->zoom, zoom_min);
128 img->zoom = MIN(img->zoom, zoom_max);
129
130 return oz != img->zoom;
131}
132
133void img_render(img_t *img, win_t *win) {
134 int sx, sy, sw, sh;
135 int dx, dy, dw, dh;
136
137 if (!img || !win)
138 return;
139
140 if (!img->im || img->scalemode != SCALE_ZOOM) {
141 img_fit(img, win);
142 if ((!img->im || img->scalemode == SCALE_DOWN) && img->zoom > 1.0)
143 img->zoom = 1.0;
144 }
145
146 if (!img->re) {
147 /* rendered for the first time */
148 img->re = 1;
149 if (img->zoom * img->w <= win->w)
150 img->x = (win->w - img->w * img->zoom) / 2;
151 else
152 img->x = 0;
153 if (img->zoom * img->h <= win->h)
154 img->y = (win->h - img->h * img->zoom) / 2;
155 else
156 img->y = 0;
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 if (img->im)
191 imlib_context_set_image(img->im);
192 else
193 imlib_context_set_image(im_invalid);
194
195 if (imlib_image_has_alpha() && !img->alpha)
196 win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
197
198 imlib_context_set_drawable(win->pm);
199 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
200
201 win_draw(win);
202}
203
204int img_fit_win(img_t *img, win_t *win) {
205 if (!img || !img->im || !win)
206 return 0;
207
208 img->scalemode = SCALE_FIT;
209 return img_fit(img, win);
210}
211
212int img_center(img_t *img, win_t *win) {
213 int ox, oy;
214
215 if (!img || !win)
216 return 0;
217
218 ox = img->x;
219 oy = img->y;
220
221 img->x = (win->w - img->w * img->zoom) / 2;
222 img->y = (win->h - img->h * img->zoom) / 2;
223
224 return ox != img->x || oy != img->y;
225}
226
227int img_zoom(img_t *img, float z) {
228 if (!img || !img->im)
229 return 0;
230
231 z = MAX(z, zoom_min);
232 z = MIN(z, zoom_max);
233
234 img->scalemode = SCALE_ZOOM;
235
236 if (z != img->zoom) {
237 img->x -= (img->w * z - img->w * img->zoom) / 2;
238 img->y -= (img->h * z - img->h * img->zoom) / 2;
239 img->zoom = z;
240 img->checkpan = 1;
241 return 1;
242 } else {
243 return 0;
244 }
245}
246
247int img_zoom_in(img_t *img) {
248 int i;
249
250 if (!img || !img->im)
251 return 0;
252
253 for (i = 1; i < zl_cnt; ++i) {
254 if (zoom_levels[i] > img->zoom * 100.0)
255 return img_zoom(img, zoom_levels[i] / 100.0);
256 }
257 return 0;
258}
259
260int img_zoom_out(img_t *img) {
261 int i;
262
263 if (!img || !img->im)
264 return 0;
265
266 for (i = zl_cnt - 2; i >= 0; --i) {
267 if (zoom_levels[i] < img->zoom * 100.0)
268 return img_zoom(img, zoom_levels[i] / 100.0);
269 }
270 return 0;
271}
272
273int img_move(img_t *img, win_t *win, int dx, int dy) {
274 int ox, oy;
275
276 if (!img || !img->im || !win)
277 return 0;
278
279 ox = img->x;
280 oy = img->y;
281
282 img->x += dx;
283 img->y += dy;
284
285 img_check_pan(img, win);
286
287 return ox != img->x || oy != img->y;
288}
289
290int img_pan(img_t *img, win_t *win, pandir_t dir) {
291 if (!img || !img->im || !win)
292 return 0;
293
294 switch (dir) {
295 case PAN_LEFT:
296 return img_move(img, win, win->w / 5, 0);
297 case PAN_RIGHT:
298 return img_move(img, win, win->w / 5 * -1, 0);
299 case PAN_UP:
300 return img_move(img, win, 0, win->h / 5);
301 case PAN_DOWN:
302 return img_move(img, win, 0, win->h / 5 * -1);
303 }
304
305 return 0;
306}
307
308void img_rotate(img_t *img, win_t *win, int d) {
309 int ox, oy, tmp;
310
311 if (!img || !img->im || !win)
312 return;
313
314 ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
315 oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
316
317 imlib_context_set_image(img->im);
318 imlib_image_orientate(d);
319
320 img->x = oy + (win->w - win->h) / 2;
321 img->y = ox + (win->h - win->w) / 2;
322
323 tmp = img->w;
324 img->w = img->h;
325 img->h = tmp;
326
327 img->checkpan = 1;
328}
329
330void img_rotate_left(img_t *img, win_t *win) {
331 img_rotate(img, win, 3);
332}
333
334void img_rotate_right(img_t *img, win_t *win) {
335 img_rotate(img, win, 1);
336}
337
338void img_toggle_antialias(img_t *img) {
339 if (img && img->im) {
340 img->aa ^= 1;
341 imlib_context_set_image(img->im);
342 imlib_context_set_anti_alias(img->aa);
343 }
344}