nsxiv/image.c

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2011-01-17 14:57:59 +01:00
/* 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 <unistd.h>
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#include "config.h"
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#include "image.h"
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#include "options.h"
#include "util.h"
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int zl_cnt;
float zoom_min;
float zoom_max;
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void img_init(img_t *img, win_t *win) {
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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;
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if (img) {
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img->im = NULL;
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img->zoom = options->zoom;
img->zoom = MAX(img->zoom, zoom_min);
img->zoom = MIN(img->zoom, zoom_max);
img->aa = options->aa;
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img->alpha = 1;
}
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if (win) {
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
}
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}
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int img_load(img_t *img, const char *filename) {
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if (!img || !filename)
return 0;
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if (access(filename, R_OK) || !(img->im = imlib_load_image(filename))) {
warn("could not open image: %s", filename);
return 0;
}
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imlib_context_set_image(img->im);
imlib_image_set_changes_on_disk();
imlib_context_set_anti_alias(img->aa);
img->scalemode = options->scalemode;
img->re = 0;
img->checkpan = 0;
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img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
return 1;
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}
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void img_close(img_t *img, int decache) {
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if (img && img->im) {
imlib_context_set_image(img->im);
if (decache)
imlib_free_image_and_decache();
else
imlib_free_image();
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img->im = NULL;
}
}
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void img_check_pan(img_t *img, win_t *win) {
if (!img || !win)
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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;
}
}
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;
}
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void img_render(img_t *img, win_t *win) {
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int sx, sy, sw, sh;
int dx, dy, dw, dh;
if (!img || !img->im || !win)
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return;
if (img->scalemode != SCALE_ZOOM) {
img_fit(img, win);
if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
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img->zoom = 1.0;
}
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if (!img->re) {
/* rendered for the first time */
img->re = 1;
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if (img->zoom * img->w <= win->w)
img->x = (win->w - img->w * img->zoom) / 2;
else
img->x = 0;
if (img->zoom * img->h <= win->h)
img->y = (win->h - img->h * img->zoom) / 2;
else
img->y = 0;
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}
if (img->checkpan) {
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img_check_pan(img, win);
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img->checkpan = 0;
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}
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/* calculate source and destination offsets */
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if (img->x < 0) {
sx = -img->x / img->zoom;
sw = win->w / img->zoom;
dx = 0;
dw = win->w;
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} else {
sx = 0;
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sw = img->w;
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dx = img->x;
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dw = img->w * img->zoom;
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}
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if (img->y < 0) {
sy = -img->y / img->zoom;
sh = win->h / img->zoom;
dy = 0;
dh = win->h;
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} else {
sy = 0;
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sh = img->h;
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dy = img->y;
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dh = img->h * img->zoom;
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}
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win_clear(win);
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imlib_context_set_image(img->im);
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if (imlib_image_has_alpha() && !img->alpha)
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win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
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imlib_context_set_drawable(win->pm);
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imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
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win_draw(win);
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}
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int img_fit_win(img_t *img, win_t *win) {
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if (!img || !img->im || !win)
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return 0;
img->scalemode = SCALE_FIT;
return img_fit(img, win);
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}
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int img_center(img_t *img, win_t *win) {
int ox, oy;
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if (!img || !win)
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return 0;
ox = img->x;
oy = img->y;
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img->x = (win->w - img->w * img->zoom) / 2;
img->y = (win->h - img->h * img->zoom) / 2;
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return ox != img->x || oy != img->y;
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}
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int img_zoom(img_t *img, win_t *win, float z) {
if (!img || !img->im || !win)
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return 0;
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z = MAX(z, zoom_min);
z = MIN(z, zoom_max);
img->scalemode = SCALE_ZOOM;
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if (z != img->zoom) {
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img->x = win->w / 2 - (win->w / 2 - img->x) * z / img->zoom;
img->y = win->h / 2 - (win->h / 2 - img->y) * z / img->zoom;
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img->zoom = z;
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img->checkpan = 1;
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return 1;
} else {
return 0;
}
}
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int img_zoom_in(img_t *img, win_t *win) {
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int i;
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if (!img || !img->im || !win)
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return 0;
for (i = 1; i < zl_cnt; ++i) {
if (zoom_levels[i] > img->zoom * 100.0)
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return img_zoom(img, win, zoom_levels[i] / 100.0);
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}
return 0;
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}
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int img_zoom_out(img_t *img, win_t *win) {
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int i;
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if (!img || !img->im || !win)
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return 0;
for (i = zl_cnt - 2; i >= 0; --i) {
if (zoom_levels[i] < img->zoom * 100.0)
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return img_zoom(img, win, zoom_levels[i] / 100.0);
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}
return 0;
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}
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int img_move(img_t *img, win_t *win, int dx, int dy) {
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int ox, oy;
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if (!img || !img->im || !win)
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return 0;
ox = img->x;
oy = img->y;
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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) {
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if (!img || !img->im || !win)
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return 0;
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switch (dir) {
case PAN_LEFT:
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return img_move(img, win, win->w / 5, 0);
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case PAN_RIGHT:
return img_move(img, win, win->w / 5 * -1, 0);
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case PAN_UP:
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return img_move(img, win, 0, win->h / 5);
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case PAN_DOWN:
return img_move(img, win, 0, win->h / 5 * -1);
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}
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return 0;
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}
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int img_pan_edge(img_t *img, win_t *win, pandir_t dir) {
int ox, oy;
if (!img || !img->im || !win)
return 0;
ox = img->x;
oy = img->y;
switch (dir) {
case PAN_LEFT:
img->x = 0;
break;
case PAN_RIGHT:
img->x = win->w - img->w * img->zoom;
break;
case PAN_UP:
img->y = 0;
break;
case PAN_DOWN:
img->y = win->h - img->h * img->zoom;
break;
}
img_check_pan(img, win);
return ox != img->x || oy != img->y;
}
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void img_rotate(img_t *img, win_t *win, int d) {
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int ox, oy, tmp;
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if (!img || !img->im || !win)
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return;
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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;
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imlib_context_set_image(img->im);
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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;
}
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void img_rotate_left(img_t *img, win_t *win) {
img_rotate(img, win, 3);
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}
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void img_rotate_right(img_t *img, win_t *win) {
img_rotate(img, win, 1);
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}
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void img_toggle_antialias(img_t *img) {
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if (img && img->im) {
img->aa ^= 1;
imlib_context_set_image(img->im);
imlib_context_set_anti_alias(img->aa);
}
}