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nsxiv/image.c

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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., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301, USA.
*/
#define _IMAGE_CONFIG
#include <unistd.h>
#ifdef HAVE_GIFLIB
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <gif_lib.h>
#endif
#include "image.h"
#include "options.h"
#include "util.h"
#include "config.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->im = NULL;
img->multi.cap = img->multi.cnt = 0;
img->zoom = options->zoom;
img->zoom = MAX(img->zoom, zoom_min);
img->zoom = MIN(img->zoom, zoom_max);
img->aa = options->aa;
img->alpha = 1;
}
if (win) {
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
}
}
#ifdef HAVE_GIFLIB
int img_load_gif(img_t *img, const fileinfo_t *file) {
GifFileType *gif;
GifRowType *rows = NULL;
GifRecordType rec;
ColorMapObject *cmap;
DATA32 bgpixel, *data, *ptr;
DATA32 *prev_frame = NULL;
Imlib_Image *im;
int i, j, bg, r, g, b;
int x, y, w, h, sw, sh;
int intoffset[] = { 0, 4, 2, 1 };
int intjump[] = { 8, 8, 4, 2 };
int err = 0, transp = -1;
if (img->multi.cap == 0) {
img->multi.cap = 8;
img->multi.frames = (Imlib_Image**)
s_malloc(sizeof(Imlib_Image*) * img->multi.cap);
}
img->multi.cnt = 0;
img->multi.sel = 0;
gif = DGifOpenFileName(file->path);
if (!gif) {
warn("could not open gif file: %s", file->name);
return 0;
}
bg = gif->SBackGroundColor;
sw = gif->SWidth;
sh = gif->SHeight;
do {
if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
warn("could not open gif file: %s", file->name);
err = 1;
break;
}
if (rec == EXTENSION_RECORD_TYPE) {
int ext_code;
GifByteType *ext = NULL;
DGifGetExtension(gif, &ext_code, &ext);
while (ext) {
if (ext_code == 0xf9) {
if (ext[1] & 1)
transp = (int) ext[4];
else
transp = -1;
}
ext = NULL;
DGifGetExtensionNext(gif, &ext);
}
} else if (rec == IMAGE_DESC_RECORD_TYPE) {
if (DGifGetImageDesc(gif) == GIF_ERROR) {
warn("could not open gif frame # %d: %s", img->multi.cnt, file->name);
err = 1;
break;
}
x = gif->Image.Left;
y = gif->Image.Top;
w = gif->Image.Width;
h = gif->Image.Height;
rows = (GifRowType*) s_malloc(h * sizeof(GifRowType));
for (i = 0; i < h; i++)
rows[i] = (GifRowType) s_malloc(w * sizeof(GifPixelType));
if (gif->Image.Interlace) {
for (i = 0; i < 4; i++) {
for (j = intoffset[i]; j < h; j += intjump[i])
DGifGetLine(gif, rows[j], w);
}
} else {
for (i = 0; i < h; i++)
DGifGetLine(gif, rows[i], w);
}
ptr = data = (DATA32*) s_malloc(sizeof(DATA32) * sw * sh);
cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
r = cmap->Colors[bg].Red;
g = cmap->Colors[bg].Green;
b = cmap->Colors[bg].Blue;
bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
for (i = 0; i < sh; i++) {
for (j = 0; j < sw; j++) {
if (i < y || i >= y + h || j < x || j >= x + w) {
if (transp >= 0 && prev_frame)
*ptr = prev_frame[i * sw + j];
else
*ptr = bgpixel;
} else if (rows[i-y][j-x] == transp) {
if (prev_frame)
*ptr = prev_frame[i * sw + j];
else
*ptr = bgpixel;
} else {
r = cmap->Colors[rows[i-y][j-x]].Red;
g = cmap->Colors[rows[i-y][j-x]].Green;
b = cmap->Colors[rows[i-y][j-x]].Blue;
*ptr = 0xff << 24 | r << 16 | g << 8 | b;
}
ptr++;
}
}
im = imlib_create_image_using_copied_data(sw, sh, data);
for (i = 0; i < h; i++)
free(rows[i]);
free(rows);
free(data);
if (!im) {
warn("could not open gif frame # %d: %s", img->multi.cnt, file->name);
err = 1;
break;
}
imlib_context_set_image(im);
prev_frame = imlib_image_get_data_for_reading_only();
imlib_image_set_format("gif");
if (transp >= 0)
imlib_image_set_has_alpha(1);
if (img->multi.cnt == img->multi.cap) {
img->multi.cap *= 2;
img->multi.frames = (Imlib_Image**)
s_realloc(img->multi.frames,
img->multi.cap * sizeof(Imlib_Image*));
}
img->multi.frames[img->multi.cnt++] = im;
}
} while (rec != TERMINATE_RECORD_TYPE);
DGifCloseFile(gif);
if (!err && img->multi.cnt > 1) {
imlib_context_set_image(img->im);
imlib_free_image();
img->im = img->multi.frames[0];
} else {
for (i = 0; i < img->multi.cnt; i++) {
imlib_context_set_image(img->multi.frames[i]);
imlib_free_image();
}
img->multi.cnt = 0;
}
imlib_context_set_image(img->im);
return !err;
}
#endif /* HAVE_GIFLIB */
int img_load(img_t *img, const fileinfo_t *file) {
const char *fmt;
if (!img || !file || !file->name || !file->path)
return 0;
if (access(file->path, R_OK) || !(img->im = imlib_load_image(file->path))) {
warn("could not open image: %s", file->name);
return 0;
}
imlib_context_set_image(img->im);
imlib_image_set_changes_on_disk();
imlib_context_set_anti_alias(img->aa);
fmt = imlib_image_format();
#ifdef HAVE_GIFLIB
if (!strcmp(fmt, "gif"))
img_load_gif(img, file);
#else
/* avoid unused-but-set-variable warning */
(void) fmt;
#endif
img->scalemode = options->scalemode;
img->re = 0;
img->checkpan = 0;
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
return 1;
}
void img_close(img_t *img, int decache) {
int i;
if (!img)
return;
if (img->multi.cnt) {
for (i = 0; i < img->multi.cnt; i++) {
imlib_context_set_image(img->multi.frames[i]);
imlib_free_image();
}
img->multi.cnt = 0;
img->im = NULL;
} else if (img->im) {
imlib_context_set_image(img->im);
if (decache)
imlib_free_image_and_decache();
else
imlib_free_image();
img->im = NULL;
}
}
void img_check_pan(img_t *img, win_t *win) {
if (!img || !win)
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;
}
void img_render(img_t *img, win_t *win) {
int sx, sy, sw, sh;
int dx, dy, dw, dh;
if (!img || !img->im || !win)
return;
if (img->scalemode != SCALE_ZOOM) {
img_fit(img, win);
if (img->scalemode == SCALE_DOWN && img->zoom > 1.0)
img->zoom = 1.0;
}
if (!img->re) {
/* rendered for the first time */
img->re = 1;
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;
}
if (img->checkpan) {
img_check_pan(img, win);
img->checkpan = 0;
}
/* calculate source and destination offsets */
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_image(img->im);
if (imlib_image_has_alpha() && !img->alpha)
win_draw_rect(win, win->pm, dx, dy, dw, dh, True, 0, win->white);
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_change_frame(img_t *img, int d) {
if (!img || !img->multi.cnt || !d)
return 0;
d += img->multi.sel;
if (d < 0)
d = 0;
else if (d >= img->multi.cnt)
d = img->multi.cnt - 1;
img->multi.sel = d;
img->im = img->multi.frames[d];
imlib_context_set_image(img->im);
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
img->checkpan = 1;
return 1;
}
int img_fit_win(img_t *img, win_t *win) {
if (!img || !img->im || !win)
return 0;
img->scalemode = SCALE_FIT;
return img_fit(img, win);
}
int img_center(img_t *img, win_t *win) {
int ox, oy;
if (!img || !win)
return 0;
ox = img->x;
oy = img->y;
img->x = (win->w - img->w * img->zoom) / 2;
img->y = (win->h - img->h * img->zoom) / 2;
return ox != img->x || oy != img->y;
}
int img_zoom(img_t *img, win_t *win, float z) {
if (!img || !img->im || !win)
return 0;
z = MAX(z, zoom_min);
z = MIN(z, zoom_max);
img->scalemode = SCALE_ZOOM;
if (z != img->zoom) {
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;
img->zoom = z;
img->checkpan = 1;
return 1;
} else {
return 0;
}
}
int img_zoom_in(img_t *img, win_t *win) {
int i;
if (!img || !img->im || !win)
return 0;
for (i = 1; i < zl_cnt; i++) {
if (zoom_levels[i] > img->zoom * 100.0)
return img_zoom(img, win, zoom_levels[i] / 100.0);
}
return 0;
}
int img_zoom_out(img_t *img, win_t *win) {
int i;
if (!img || !img->im || !win)
return 0;
for (i = zl_cnt - 2; i >= 0; i--) {
if (zoom_levels[i] < img->zoom * 100.0)
return img_zoom(img, win, zoom_levels[i] / 100.0);
}
return 0;
}
int img_move(img_t *img, win_t *win, int dx, int dy) {
int ox, oy;
if (!img || !img->im || !win)
return 0;
ox = img->x;
oy = img->y;
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, direction_t dir, int screen) {
if (!img || !img->im || !win)
return 0;
switch (dir) {
case DIR_LEFT:
return img_move(img, win, win->w / (screen ? 1 : 5), 0);
case DIR_RIGHT:
return img_move(img, win, win->w / (screen ? 1 : 5) * -1, 0);
case DIR_UP:
return img_move(img, win, 0, win->h / (screen ? 1 : 5));
case DIR_DOWN:
return img_move(img, win, 0, win->h / (screen ? 1 : 5) * -1);
}
return 0;
}
int img_pan_edge(img_t *img, win_t *win, direction_t dir) {
int ox, oy;
if (!img || !img->im || !win)
return 0;
ox = img->x;
oy = img->y;
switch (dir) {
case DIR_LEFT:
img->x = 0;
break;
case DIR_RIGHT:
img->x = win->w - img->w * img->zoom;
break;
case DIR_UP:
img->y = 0;
break;
case DIR_DOWN:
img->y = win->h - img->h * img->zoom;
break;
}
img_check_pan(img, win);
return ox != img->x || oy != img->y;
}
void img_rotate(img_t *img, win_t *win, int d) {
int ox, oy, tmp;
if (!img || !img->im || !win)
return;
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;
imlib_context_set_image(img->im);
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;
}
void img_rotate_left(img_t *img, win_t *win) {
img_rotate(img, win, 3);
}
void img_rotate_right(img_t *img, win_t *win) {
img_rotate(img, win, 1);
}
void img_toggle_antialias(img_t *img) {
if (img && img->im) {
img->aa ^= 1;
imlib_context_set_image(img->im);
imlib_context_set_anti_alias(img->aa);
}
}
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