129 lines
3 KiB
C
129 lines
3 KiB
C
/* sxiv: image.c
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* Copyright (c) 2011 Bert Muennich <muennich at informatik.hu-berlin.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <Imlib2.h>
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#include "sxiv.h"
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#include "image.h"
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void imlib_init(win_t *win) {
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if (!win)
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return;
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imlib_context_set_display(win->env.dpy);
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imlib_context_set_visual(win->env.vis);
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imlib_context_set_colormap(win->env.cmap);
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imlib_context_set_drawable(win->xwin);
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}
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void imlib_destroy() {
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if (imlib_context_get_image())
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imlib_free_image();
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}
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int img_load(img_t *img, const char *filename) {
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Imlib_Image *im;
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if (!img || !filename)
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return -1;
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if (imlib_context_get_image())
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imlib_free_image();
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if (!(im = imlib_load_image(filename))) {
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WARN("could not open image: %s", filename);
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return -1;
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}
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imlib_context_set_image(im);
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img->w = imlib_image_get_width();
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img->h = imlib_image_get_height();
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return 0;
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}
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void img_display(img_t *img, win_t *win) {
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float zw, zh;
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if (!img || !win || !imlib_context_get_image())
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return;
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/* set zoom level to fit image into window */
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if (img->scalemode != SCALE_ZOOM) {
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zw = (float) win->w / (float) img->w;
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zh = (float) win->h / (float) img->h;
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img->zoom = MIN(zw, zh);
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if (img->zoom * 100.0 < ZOOM_MIN)
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img->zoom = ZOOM_MIN / 100.0;
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else if (img->zoom * 100.0 > ZOOM_MAX)
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img->zoom = ZOOM_MAX / 100.0;
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if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
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img->zoom = 1.0;
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}
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/* center image in window */
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img->x = (win->w - img->w * img->zoom) / 2;
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img->y = (win->h - img->h * img->zoom) / 2;
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win_clear(win);
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img_render(img, win, 0, 0, win->w, win->h);
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}
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void img_render(img_t *img, win_t *win, int x, int y, int w, int h) {
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int sx, sy, sw, sh;
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int dx, dy, dw, dh;
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if (!img || !win || !imlib_context_get_image())
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return;
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if (img->x < x) {
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sx = (x - img->x) / img->zoom;
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sw = MIN(w / img->zoom, img->w - sx);
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dx = x;
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dw = sw * img->zoom;
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} else {
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sx = 0;
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sw = MIN((w - img->x + x) / img->zoom, img->w);
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dx = img->x;
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dw = sw * img->zoom;
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}
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if (img->y < y) {
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sy = (y - img->y) / img->zoom;
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sh = MIN(h / img->zoom, img->h - sy);
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dy = y;
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dh = sh * img->zoom;
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} else {
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sy = 0;
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sh = MIN((h - img->y + y) / img->zoom, img->h);
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dy = img->y;
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dh = sh * img->zoom;
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}
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if (sw < 0 || sh < 0)
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return;
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imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
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}
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