zeniba-nsxiv/thumbs.c
2011-02-25 12:08:12 +01:00

253 lines
5.5 KiB
C

/* sxiv: thumbs.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 <string.h>
#include <Imlib2.h>
#include "config.h"
#include "thumbs.h"
#include "util.h"
extern Imlib_Image *im_broken;
const int thumb_dim = THUMB_SIZE + 10;
void tns_init(tns_t *tns, int cnt) {
if (!tns)
return;
tns->cnt = tns->first = tns->sel = 0;
tns->thumbs = (thumb_t*) s_malloc(cnt * sizeof(thumb_t));
memset(tns->thumbs, 0, cnt * sizeof(thumb_t));
tns->dirty = 0;
}
void tns_free(tns_t *tns, win_t *win) {
int i;
if (!tns || !tns->thumbs)
return;
for (i = 0; i < tns->cnt; ++i)
win_free_pixmap(win, tns->thumbs[i].pm);
free(tns->thumbs);
tns->thumbs = NULL;
}
void tns_load(tns_t *tns, win_t *win, const char *filename) {
int w, h;
float z, zw, zh;
thumb_t *t;
Imlib_Image *im;
if (!tns || !win || !filename)
return;
if ((im = imlib_load_image(filename)))
imlib_context_set_image(im);
else
imlib_context_set_image(im_broken);
w = imlib_image_get_width();
h = imlib_image_get_height();
zw = (float) THUMB_SIZE / (float) w;
zh = (float) THUMB_SIZE / (float) h;
z = MIN(zw, zh);
if (!im && z > 1.0)
z = 1.0;
t = &tns->thumbs[tns->cnt++];
t->w = z * w;
t->h = z * h;
t->pm = win_create_pixmap(win, t->w, t->h);
imlib_context_set_drawable(t->pm);
imlib_context_set_anti_alias(1);
imlib_render_image_part_on_drawable_at_size(0, 0, w, h,
0, 0, t->w, t->h);
tns->dirty = 1;
if (im)
imlib_free_image();
}
void tns_check_view(tns_t *tns, Bool scrolled) {
int r;
if (!tns)
return;
tns->first -= tns->first % tns->cols;
r = tns->sel % tns->cols;
if (scrolled) {
/* move selection into visible area */
if (tns->sel >= tns->first + tns->cols * tns->rows)
tns->sel = tns->first + r + tns->cols * (tns->rows - 1);
else if (tns->sel < tns->first)
tns->sel = tns->first + r;
} else {
/* scroll to selection */
if (tns->first + tns->cols * tns->rows <= tns->sel) {
tns->first = tns->sel - r - tns->cols * (tns->rows - 1);
tns->dirty = 1;
} else if (tns->first > tns->sel) {
tns->first = tns->sel - r;
tns->dirty = 1;
}
}
}
void tns_render(tns_t *tns, win_t *win) {
int i, cnt, r, x, y;
thumb_t *t;
if (!tns || !tns->dirty || !win)
return;
win_clear(win);
tns->cols = MAX(1, win->w / thumb_dim);
tns->rows = MAX(1, win->h / thumb_dim);
if (tns->cnt < tns->cols * tns->rows) {
tns->first = 0;
cnt = tns->cnt;
} else {
tns_check_view(tns, False);
cnt = tns->cols * tns->rows;
if ((r = tns->first + cnt - tns->cnt) >= tns->cols)
tns->first -= r - r % tns->cols;
if (r > 0)
cnt -= r % tns->cols;
}
r = cnt % tns->cols ? 1 : 0;
tns->x = x = (win->w - MIN(cnt, tns->cols) * thumb_dim) / 2 + 5;
tns->y = y = (win->h - (cnt / tns->cols + r) * thumb_dim) / 2 + 5;
for (i = 0; i < cnt; ++i) {
t = &tns->thumbs[tns->first + i];
t->x = x + (THUMB_SIZE - t->w) / 2;
t->y = y + (THUMB_SIZE - t->h) / 2;
win_draw_pixmap(win, t->pm, t->x, t->y, t->w, t->h);
if ((i + 1) % tns->cols == 0) {
x = tns->x;
y += thumb_dim;
} else {
x += thumb_dim;
}
}
tns->dirty = 0;
tns_highlight(tns, win, tns->sel, True);
}
void tns_highlight(tns_t *tns, win_t *win, int n, Bool hl) {
thumb_t *t;
if (!tns || !win)
return;
if (n >= 0 && n < tns->cnt) {
t = &tns->thumbs[n];
win_draw_rect(win, t->x - 2, t->y - 2, t->w + 4, t->h + 4, hl);
}
win_draw(win);
}
int tns_move_selection(tns_t *tns, win_t *win, tnsdir_t dir) {
int old;
if (!tns || !win)
return 0;
old = tns->sel;
switch (dir) {
case TNS_LEFT:
if (tns->sel > 0)
--tns->sel;
break;
case TNS_RIGHT:
if (tns->sel < tns->cnt - 1)
++tns->sel;
break;
case TNS_UP:
if (tns->sel >= tns->cols)
tns->sel -= tns->cols;
break;
case TNS_DOWN:
if (tns->sel + tns->cols < tns->cnt)
tns->sel += tns->cols;
break;
}
if (tns->sel != old) {
tns_highlight(tns, win, old, False);
tns_check_view(tns, False);
if (!tns->dirty)
tns_highlight(tns, win, tns->sel, True);
}
return tns->sel != old;
}
int tns_scroll(tns_t *tns, tnsdir_t dir) {
int old;
if (!tns)
return 0;
old = tns->first;
if (dir == TNS_DOWN && tns->first + tns->cols * tns->rows < tns->cnt) {
tns->first += tns->cols;
tns_check_view(tns, True);
tns->dirty = 1;
} else if (dir == TNS_UP && tns->first >= tns->cols) {
tns->first -= tns->cols;
tns_check_view(tns, True);
tns->dirty = 1;
}
return tns->first != old;
}
int tns_translate(tns_t *tns, int x, int y) {
int n;
thumb_t *t;
if (!tns || x < tns->x || y < tns->y)
return -1;
n = tns->first + (y - tns->y) / thumb_dim * tns->cols +
(x - tns->x) / thumb_dim;
if (n < tns->cnt) {
t = &tns->thumbs[n];
if (x >= t->x && x <= t->x + t->w && y >= t->y && y <= t->y + t->h)
return n;
}
return -1;
}