mirror of
https://codeberg.org/nsxiv/nsxiv
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328 lines
6.3 KiB
C
328 lines
6.3 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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int zl_cnt;
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float zoom_min;
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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]);
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zoom_min = zoom_levels[0] / 100.0;
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zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
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if (img) {
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img->zoom = options->zoom;
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img->zoom = MAX(img->zoom, zoom_min);
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img->zoom = MIN(img->zoom, zoom_max);
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img->aa = options->aa;
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}
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if (win) {
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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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}
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}
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void img_free(img_t* img) {
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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 _imlib_load_image(const char *filename) {
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Imlib_Image *im;
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if (!filename)
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return 0;
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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 0;
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}
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imlib_context_set_image(im);
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imlib_image_set_changes_on_disk();
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return 1;
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}
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int img_check(const char *filename) {
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int ret;
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if ((ret = _imlib_load_image(filename)))
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imlib_free_image();
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return ret;
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}
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int img_load(img_t *img, const char *filename) {
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if (!img || !filename)
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return 0;
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if (imlib_context_get_image())
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imlib_free_image();
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if (!_imlib_load_image(filename))
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return 0;
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imlib_context_set_anti_alias(img->aa);
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img->re = 0;
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img->checkpan = 0;
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img->zoomed = 0;
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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 1;
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}
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void img_check_pan(img_t *img, win_t *win) {
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if (!img)
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return;
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if (img->w * img->zoom > win->w) {
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if (img->x > 0 && img->x + img->w * img->zoom > win->w)
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img->x = 0;
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if (img->x < 0 && img->x + img->w * img->zoom < win->w)
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img->x = win->w - img->w * img->zoom;
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} else {
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img->x = (win->w - img->w * img->zoom) / 2;
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}
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if (img->h * img->zoom > win->h) {
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if (img->y > 0 && img->y + img->h * img->zoom > win->h)
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img->y = 0;
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if (img->y < 0 && img->y + img->h * img->zoom < win->h)
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img->y = win->h - img->h * img->zoom;
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} else {
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img->y = (win->h - img->h * img->zoom) / 2;
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}
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}
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void img_render(img_t *img, win_t *win) {
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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->zoomed && options->scalemode != SCALE_ZOOM) {
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img_fit(img, win);
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if (options->scalemode == SCALE_DOWN && img->zoom > 1.0)
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img->zoom = 1.0;
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}
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if (!img->re) {
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/* rendered for the first time */
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img->re = 1;
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img_center(img, win);
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}
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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) {
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sx = -img->x / img->zoom;
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sw = win->w / img->zoom;
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dx = 0;
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dw = win->w;
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} else {
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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) {
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sy = -img->y / img->zoom;
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sh = win->h / img->zoom;
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dy = 0;
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dh = win->h;
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} else {
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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_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(img_t *img, win_t *win) {
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float oz, zw, zh;
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if (!img || !win)
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return 0;
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oz = img->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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img->zoom = MAX(img->zoom, zoom_min);
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img->zoom = MIN(img->zoom, zoom_max);
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return oz != img->zoom;
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}
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void img_center(img_t *img, win_t *win) {
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if (!img || !win)
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return;
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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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}
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int img_zoom(img_t *img, float z) {
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if (!img)
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return 0;
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z = MAX(z, zoom_min);
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z = MIN(z, zoom_max);
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if (z != img->zoom) {
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img->x -= (img->w * z - img->w * img->zoom) / 2;
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img->y -= (img->h * z - img->h * img->zoom) / 2;
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img->zoom = z;
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img->checkpan = 1;
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img->zoomed = 1;
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return 1;
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} else {
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return 0;
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}
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}
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int img_zoom_in(img_t *img) {
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int i;
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if (!img)
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return 0;
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for (i = 1; i < zl_cnt; ++i) {
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if (zoom_levels[i] > img->zoom * 100.0)
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return img_zoom(img, zoom_levels[i] / 100.0);
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}
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return 0;
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}
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int img_zoom_out(img_t *img) {
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int i;
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if (!img)
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return 0;
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for (i = zl_cnt - 2; i >= 0; --i) {
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if (zoom_levels[i] < img->zoom * 100.0)
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return img_zoom(img, zoom_levels[i] / 100.0);
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}
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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 || !win)
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return 0;
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ox = img->x;
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oy = img->y;
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img->x += dx;
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img->y += dy;
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img_check_pan(img, win);
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return ox != img->x || oy != img->y;
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}
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int img_pan(img_t *img, win_t *win, pandir_t dir) {
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if (!img || !win)
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return 0;
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switch (dir) {
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case PAN_LEFT:
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return img_move(img, win, win->w / 5, 0);
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case PAN_RIGHT:
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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:
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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_rotate(img_t *img, win_t *win, int d) {
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int ox, oy, tmp;
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if (!img || !win)
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return 0;
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ox = d == 1 ? img->x : win->w - img->x - img->w * img->zoom;
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oy = d == 3 ? img->y : win->h - img->y - img->h * img->zoom;
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imlib_image_orientate(d);
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img->x = oy + (win->w - win->h) / 2;
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img->y = ox + (win->h - win->w) / 2;
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tmp = img->w;
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img->w = img->h;
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img->h = tmp;
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img->checkpan = 1;
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return 1;
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}
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int img_rotate_left(img_t *img, win_t *win) {
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return img_rotate(img, win, 3);
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}
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int img_rotate_right(img_t *img, win_t *win) {
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return img_rotate(img, win, 1);
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}
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int img_toggle_antialias(img_t *img) {
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if (!img)
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return 0;
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img->aa ^= 1;
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imlib_context_set_anti_alias(img->aa);
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return 1;
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}
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