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/* 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"
void imlib_init(win_t *win) {
if (!win)
return;
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
imlib_context_set_drawable(win->xwin);
}
void imlib_destroy() {
if (imlib_context_get_image())
imlib_free_image();
}
void img_load(img_t *img, const char *filename) {
Imlib_Image *im;
if (!img || !filename)
return;
if (imlib_context_get_image())
imlib_free_image();
if (!(im = imlib_load_image(filename)))
DIE("could not open image: %s", filename);
imlib_context_set_image(im);
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
}
void img_display(img_t *img, win_t *win) {
float zw, zh;
if (!img || !win || !imlib_context_get_image())
return;
/* set zoom level to fit image into window */
if (img->scalemode != SCALE_ZOOM) {
zw = (float) win->w / (float) img->w;
zh = (float) win->h / (float) img->h;
img->zoom = MIN(zw, zh);
if (img->zoom * 100.0 < ZOOM_MIN)
img->zoom = ZOOM_MIN / 100.0;
else if (img->zoom * 100.0 > ZOOM_MAX)
img->zoom = ZOOM_MAX / 100.0;
if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
img->zoom = 1.0;
}
/* center image in window */
img->x = (win->w - img->w * img->zoom) / 2;
img->y = (win->h - img->h * img->zoom) / 2;
win_clear(win);
img_render(img, win, 0, 0, win->w, win->h);
}
void img_render(img_t *img, win_t *win, int x, int y, int w, int h) {
int sx, sy, sw, sh;
int dx, dy, dw, dh;
if (!img || !win || !imlib_context_get_image())
return;
if (img->x < x) {
sx = (x - img->x) / img->zoom;
sw = MIN(w / img->zoom, img->w - sx);
dx = x;
dw = sw * img->zoom;
} else {
sx = 0;
sw = MIN((w - img->x + x) / img->zoom, img->w);
dx = img->x;
dw = sw * img->zoom;
}
if (img->y < y) {
sy = (y - img->y) / img->zoom;
sh = MIN(h / img->zoom, img->h - sy);
dy = y;
dh = sh * img->zoom;
} else {
sy = 0;
sh = MIN((h - img->y + y) / img->zoom, img->h);
dy = img->y;
dh = sh * img->zoom;
}
if (sw < 0 || sh < 0)
return;
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
}
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