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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"
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 = 1.0;
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 img_load(img_t *img, const char *filename) {
Imlib_Image *im;
if (!img || !filename)
return -1;
if (imlib_context_get_image())
imlib_free_image();
if (!(im = imlib_load_image(filename))) {
WARN("could not open image: %s", filename);
return -1;
}
imlib_context_set_image(im);
img->re = 0;
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
return 0;
}
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;
float zw, zh;
if (!img || !win || !imlib_context_get_image())
return;
if (!img->re) {
/* rendered for the first time */
img->re = 1;
/* set zoom level to fit image into window */
if (SCALE_MODE != SCALE_ZOOM) {
zw = (float) win->w / (float) img->w;
zh = (float) win->h / (float) img->h;
img->zoom = MIN(zw, zh);
if (img->zoom < zoom_min)
img->zoom = zoom_min;
else if (img->zoom > zoom_max)
img->zoom = zoom_max;
if (SCALE_MODE == 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;
} else {
/* typically after zooming and panning */
img_check_pan(img, win);
}
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_zoom(img_t *img, float z) {
if (!img)
return 0;
if (z < zoom_min)
z = zoom_min;
else if (z > zoom_max)
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;
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;
}
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