nsxiv/image.c
2011-02-01 16:10:08 +01:00

328 lines
6.3 KiB
C

/* sxiv: image.c
* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <Imlib2.h>
#include "sxiv.h"
#include "image.h"
int zl_cnt;
float zoom_min;
float zoom_max;
void img_init(img_t *img, win_t *win) {
zl_cnt = sizeof(zoom_levels) / sizeof(zoom_levels[0]);
zoom_min = zoom_levels[0] / 100.0;
zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
if (img) {
img->zoom = options->zoom;
img->zoom = MAX(img->zoom, zoom_min);
img->zoom = MIN(img->zoom, zoom_max);
img->aa = options->aa;
}
if (win) {
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
}
}
void img_free(img_t* img) {
if (imlib_context_get_image())
imlib_free_image();
}
int _imlib_load_image(const char *filename) {
Imlib_Image *im;
if (!filename)
return 0;
if (!(im = imlib_load_image(filename))) {
WARN("could not open image: %s", filename);
return 0;
}
imlib_context_set_image(im);
imlib_image_set_changes_on_disk();
return 1;
}
int img_check(const char *filename) {
int ret;
if ((ret = _imlib_load_image(filename)))
imlib_free_image();
return ret;
}
int img_load(img_t *img, const char *filename) {
if (!img || !filename)
return 0;
if (imlib_context_get_image())
imlib_free_image();
if (!_imlib_load_image(filename))
return 0;
imlib_context_set_anti_alias(img->aa);
img->re = 0;
img->checkpan = 0;
img->zoomed = 0;
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
return 1;
}
void img_check_pan(img_t *img, win_t *win) {
if (!img)
return;
if (img->w * img->zoom > win->w) {
if (img->x > 0 && img->x + img->w * img->zoom > win->w)
img->x = 0;
if (img->x < 0 && img->x + img->w * img->zoom < win->w)
img->x = win->w - img->w * img->zoom;
} else {
img->x = (win->w - img->w * img->zoom) / 2;
}
if (img->h * img->zoom > win->h) {
if (img->y > 0 && img->y + img->h * img->zoom > win->h)
img->y = 0;
if (img->y < 0 && img->y + img->h * img->zoom < win->h)
img->y = win->h - img->h * img->zoom;
} else {
img->y = (win->h - img->h * img->zoom) / 2;
}
}
void img_render(img_t *img, win_t *win) {
int sx, sy, sw, sh;
int dx, dy, dw, dh;
if (!img || !win || !imlib_context_get_image())
return;
if (!img->zoomed && options->scalemode != SCALE_ZOOM) {
img_fit(img, win);
if (options->scalemode == SCALE_DOWN && img->zoom > 1.0)
img->zoom = 1.0;
}
if (!img->re) {
/* rendered for the first time */
img->re = 1;
img_center(img, win);
}
if (img->checkpan) {
img_check_pan(img, win);
img->checkpan = 0;
}
/* calculate source and destination offsets */
if (img->x < 0) {
sx = -img->x / img->zoom;
sw = win->w / img->zoom;
dx = 0;
dw = win->w;
} else {
sx = 0;
sw = img->w;
dx = img->x;
dw = img->w * img->zoom;
}
if (img->y < 0) {
sy = -img->y / img->zoom;
sh = win->h / img->zoom;
dy = 0;
dh = win->h;
} else {
sy = 0;
sh = img->h;
dy = img->y;
dh = img->h * img->zoom;
}
win_clear(win);
imlib_context_set_drawable(win->pm);
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
win_draw(win);
}
int img_fit(img_t *img, win_t *win) {
float oz, zw, zh;
if (!img || !win)
return 0;
oz = img->zoom;
zw = (float) win->w / (float) img->w;
zh = (float) win->h / (float) img->h;
img->zoom = MIN(zw, zh);
img->zoom = MAX(img->zoom, zoom_min);
img->zoom = MIN(img->zoom, zoom_max);
return oz != img->zoom;
}
void img_center(img_t *img, win_t *win) {
if (!img || !win)
return;
img->x = (win->w - img->w * img->zoom) / 2;
img->y = (win->h - img->h * img->zoom) / 2;
}
int img_zoom(img_t *img, float z) {
if (!img)
return 0;
z = MAX(z, zoom_min);
z = MIN(z, zoom_max);
if (z != img->zoom) {
img->x -= (img->w * z - img->w * img->zoom) / 2;
img->y -= (img->h * z - img->h * img->zoom) / 2;
img->zoom = z;
img->checkpan = 1;
img->zoomed = 1;
return 1;
} else {
return 0;
}
}
int img_zoom_in(img_t *img) {
int i;
if (!img)
return 0;
for (i = 1; i < zl_cnt; ++i) {
if (zoom_levels[i] > img->zoom * 100.0)
return img_zoom(img, zoom_levels[i] / 100.0);
}
return 0;
}
int img_zoom_out(img_t *img) {
int i;
if (!img)
return 0;
for (i = zl_cnt - 2; i >= 0; --i) {
if (zoom_levels[i] < img->zoom * 100.0)
return img_zoom(img, zoom_levels[i] / 100.0);
}
return 0;
}
int img_move(img_t *img, win_t *win, int dx, int dy) {
int ox, oy;
if (!img || !win)
return 0;
ox = img->x;
oy = img->y;
img->x += dx;
img->y += dy;
img_check_pan(img, win);
return ox != img->x || oy != img->y;
}
int img_pan(img_t *img, win_t *win, pandir_t dir) {
if (!img || !win)
return 0;
switch (dir) {
case PAN_LEFT:
return img_move(img, win, win->w / 5, 0);
case PAN_RIGHT:
return img_move(img, win, win->w / 5 * -1, 0);
case PAN_UP:
return img_move(img, win, 0, win->h / 5);
case PAN_DOWN:
return img_move(img, win, 0, win->h / 5 * -1);
}
return 0;
}
int img_rotate(img_t *img, win_t *win, int d) {
int ox, oy, tmp;
if (!img || !win)
return 0;
ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
imlib_image_orientate(d);
img->x = oy + (win->w - win->h) / 2;
img->y = ox + (win->h - win->w) / 2;
tmp = img->w;
img->w = img->h;
img->h = tmp;
img->checkpan = 1;
return 1;
}
int img_rotate_left(img_t *img, win_t *win) {
return img_rotate(img, win, 3);
}
int img_rotate_right(img_t *img, win_t *win) {
return img_rotate(img, win, 1);
}
int img_toggle_antialias(img_t *img) {
if (!img)
return 0;
img->aa ^= 1;
imlib_context_set_anti_alias(img->aa);
return 1;
}