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/* Copyright 2011, 2012 Bert Muennich
*
* This file is part of sxiv.
*
* sxiv 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.
*
* sxiv 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 sxiv. If not, see <http://www.gnu.org/licenses/>.
*/
#define _POSIX_C_SOURCE 200112L
#define _IMAGE_CONFIG
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#if HAVE_GIFLIB
#include <gif_lib.h>
enum { MIN_GIF_DELAY = 25 };
#endif
#include "exif.h"
#include "image.h"
#include "options.h"
#include "util.h"
#include "config.h"
float zoom_min;
float zoom_max;
static int zoomdiff(float z1, float z2)
{
return (int) (z1 * 1000.0 - z2 * 1000.0);
}
static void img_apply_gamma(img_t *img)
{
if (img == NULL || img->im == NULL || img->cmod == NULL)
return;
if (img->gamma == 0) {
imlib_context_set_color_modifier(NULL);
} else {
double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
imlib_context_set_color_modifier(img->cmod);
imlib_reset_color_modifier();
imlib_modify_color_modifier_gamma(1.0 + img->gamma * (range / GAMMA_RANGE));
}
}
void img_init(img_t *img, win_t *win)
{
zoom_min = zoom_levels[0] / 100.0;
zoom_max = zoom_levels[ARRLEN(zoom_levels) - 1] / 100.0;
if (img == NULL || win == NULL)
return;
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
img->im = NULL;
img->win = win;
img->scalemode = options->scalemode;
img->zoom = options->zoom;
img->zoom = MAX(img->zoom, zoom_min);
img->zoom = MIN(img->zoom, zoom_max);
img->checkpan = false;
img->dirty = false;
img->aa = ANTI_ALIAS;
img->alpha = ALPHA_LAYER;
img->multi.cap = img->multi.cnt = 0;
img->multi.animate = false;
img->multi.length = img->multi.repeat = 0;
img->cmod = imlib_create_color_modifier();
img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
img->ss.on = options->slideshow > 0;
img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY;
}
void exif_auto_orientate(const fileinfo_t *file)
{
switch (exif_orientation(file)) {
case 5:
imlib_image_orientate(1);
case 2:
imlib_image_flip_vertical();
break;
case 3:
imlib_image_orientate(2);
break;
case 7:
imlib_image_orientate(1);
case 4:
imlib_image_flip_horizontal();
break;
case 6:
imlib_image_orientate(1);
break;
case 8:
imlib_image_orientate(3);
break;
}
}
#if HAVE_GIFLIB
bool 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 px, py, pw, ph;
int intoffset[] = { 0, 4, 2, 1 };
int intjump[] = { 8, 8, 4, 2 };
int transp = -1;
unsigned int disposal = 0, prev_disposal = 0;
unsigned int delay = 0;
bool err = false;
if (img->multi.cap == 0) {
img->multi.cap = 8;
img->multi.frames = (img_frame_t*)
s_malloc(sizeof(img_frame_t) * img->multi.cap);
}
img->multi.cnt = img->multi.sel = 0;
img->multi.length = img->multi.repeat = 0;
#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
gif = DGifOpenFileName(file->path, NULL);
#else
gif = DGifOpenFileName(file->path);
#endif
if (gif == NULL) {
warn("could not open gif file: %s", file->name);
return false;
}
bg = gif->SBackGroundColor;
sw = gif->SWidth;
sh = gif->SHeight;
px = py = pw = ph = 0;
do {
if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
err = true;
break;
}
if (rec == EXTENSION_RECORD_TYPE) {
int ext_code;
GifByteType *ext = NULL;
DGifGetExtension(gif, &ext_code, &ext);
while (ext) {
if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
if (ext[1] & 1)
transp = (int) ext[4];
else
transp = -1;
delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
if (delay)
delay = MAX(delay, MIN_GIF_DELAY);
disposal = (unsigned int) ext[1] >> 2 & 0x7;
} else if (ext_code == APPLICATION_EXT_FUNC_CODE) {
if (ext[0] == 11 && memcmp(ext+1, "NETSCAPE2.0", 11) == 0) {
DGifGetExtensionNext(gif, &ext);
if (ext && ext[0] == 3 && ext[1] == 1)
img->multi.repeat = ((int) ext[3] << 8 | (int) ext[2]) - 1;
}
}
ext = NULL;
DGifGetExtensionNext(gif, &ext);
}
} else if (rec == IMAGE_DESC_RECORD_TYPE) {
if (DGifGetImageDesc(gif) == GIF_ERROR) {
err = true;
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 ||
rows[i-y][j-x] == transp)
{
if (prev_frame != NULL && (prev_disposal != 2 ||
i < py || i >= py + ph || j < px || j >= px + pw))
{
*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 == NULL) {
err = true;
break;
}
imlib_context_set_image(im);
imlib_image_set_format("gif");
if (transp >= 0)
imlib_image_set_has_alpha(1);
if (disposal != 3)
prev_frame = imlib_image_get_data_for_reading_only();
prev_disposal = disposal;
px = x, py = y, pw = w, ph = h;
if (img->multi.cnt == img->multi.cap) {
img->multi.cap *= 2;
img->multi.frames = (img_frame_t*)
s_realloc(img->multi.frames,
img->multi.cap * sizeof(img_frame_t));
}
img->multi.frames[img->multi.cnt].im = im;
img->multi.frames[img->multi.cnt].delay = delay ? delay : GIF_DELAY;
img->multi.length += img->multi.frames[img->multi.cnt].delay;
img->multi.cnt++;
}
} while (rec != TERMINATE_RECORD_TYPE);
DGifCloseFile(gif);
if (err && !file->loaded)
warn("corrupted gif file: %s", file->name);
if (img->multi.cnt > 1) {
imlib_context_set_image(img->im);
imlib_free_image();
img->im = img->multi.frames[0].im;
img->multi.animate = GIF_AUTOPLAY;
} else if (img->multi.cnt == 1) {
imlib_context_set_image(img->multi.frames[0].im);
imlib_free_image();
img->multi.cnt = 0;
img->multi.animate = false;
}
imlib_context_set_image(img->im);
return !err;
}
#endif /* HAVE_GIFLIB */
bool img_load(img_t *img, const fileinfo_t *file)
{
const char *fmt;
if (img == NULL || file == NULL || file->name == NULL || file->path == NULL)
return false;
if (access(file->path, R_OK) < 0 ||
(img->im = imlib_load_image(file->path)) == NULL)
{
warn("could not open image: %s", file->name);
return false;
}
imlib_context_set_image(img->im);
imlib_image_set_changes_on_disk();
if ((fmt = imlib_image_format()) == NULL) {
warn("could not open image: %s", file->name);
return false;
}
if (STREQ(fmt, "jpeg"))
exif_auto_orientate(file);
#if HAVE_GIFLIB
if (STREQ(fmt, "gif"))
img_load_gif(img, file);
#endif
img_apply_gamma(img);
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
img->checkpan = true;
img->dirty = true;
return true;
}
void img_close(img_t *img, bool decache)
{
int i;
if (img == NULL)
return;
if (img->multi.cnt > 0) {
for (i = 0; i < img->multi.cnt; i++) {
imlib_context_set_image(img->multi.frames[i].im);
imlib_free_image();
}
img->multi.cnt = 0;
img->im = NULL;
} else if (img->im != NULL) {
imlib_context_set_image(img->im);
if (decache)
imlib_free_image_and_decache();
else
imlib_free_image();
img->im = NULL;
}
if (img->cmod)
imlib_context_set_color_modifier(NULL);
}
void img_check_pan(img_t *img, bool moved)
{
win_t *win;
int ox, oy;
float w, h;
if (img == NULL || img->im == NULL || img->win == NULL)
return;
win = img->win;
w = img->w * img->zoom;
h = img->h * img->zoom;
ox = img->x;
oy = img->y;
if (w < win->w)
img->x = (win->w - w) / 2;
else if (img->x > 0)
img->x = 0;
else if (img->x + w < win->w)
img->x = win->w - w;
if (h < win->h)
img->y = (win->h - h) / 2;
else if (img->y > 0)
img->y = 0;
else if (img->y + h < win->h)
img->y = win->h - h;
if (!moved && (ox != img->x || oy != img->y))
img->dirty = true;
}
bool img_fit(img_t *img)
{
float z, zmax, zw, zh;
if (img == NULL || img->im == NULL || img->win == NULL)
return false;
if (img->scalemode == SCALE_ZOOM)
return false;
zmax = img->scalemode == SCALE_DOWN ? 1.0 : zoom_max;
zw = (float) img->win->w / (float) img->w;
zh = (float) img->win->h / (float) img->h;
switch (img->scalemode) {
case SCALE_WIDTH:
z = zw;
break;
case SCALE_HEIGHT:
z = zh;
break;
default:
z = MIN(zw, zh);
break;
}
z = MAX(z, zoom_min);
z = MIN(z, zmax);
if (zoomdiff(z, img->zoom) != 0) {
img->zoom = z;
img->dirty = true;
return true;
} else {
return false;
}
}
void img_render(img_t *img)
{
win_t *win;
int sx, sy, sw, sh;
int dx, dy, dw, dh;
Imlib_Image bg;
unsigned long c;
if (img == NULL || img->im == NULL || img->win == NULL)
return;
win = img->win;
img_fit(img);
if (img->checkpan) {
img_check_pan(img, false);
img->checkpan = false;
}
if (!img->dirty)
return;
/* calculate source and destination offsets:
* - part of image drawn on full window, or
* - full image drawn on part of window
*/
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);
imlib_context_set_anti_alias(img->aa);
imlib_context_set_drawable(win->pm);
if (imlib_image_has_alpha()) {
if ((bg = imlib_create_image(dw, dh)) == NULL)
die("could not allocate memory");
imlib_context_set_image(bg);
imlib_image_set_has_alpha(0);
if (img->alpha) {
int i, c, r;
DATA32 col[2] = { 0xFF666666, 0xFF999999 };
DATA32 * data = imlib_image_get_data();
for (r = 0; r < dh; r++) {
i = r * dw;
if (r == 0 || r == 8) {
for (c = 0; c < dw; c++)
data[i++] = col[!(c & 8) ^ !r];
} else {
memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
}
}
imlib_image_put_back_data(data);
} else {
c = win->fullscreen ? win->fscol : win->bgcol;
imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
imlib_image_fill_rectangle(0, 0, dw, dh);
}
imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
imlib_context_set_color_modifier(NULL);
imlib_render_image_on_drawable(dx, dy);
imlib_free_image();
if (img->gamma != 0)
imlib_context_set_color_modifier(img->cmod);
} else {
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
}
img->dirty = false;
}
bool img_fit_win(img_t *img, scalemode_t sm)
{
float oz;
if (img == NULL || img->im == NULL || img->win == NULL)
return false;
oz = img->zoom;
img->scalemode = sm;
if (img_fit(img)) {
img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
img->checkpan = true;
return true;
} else {
return false;
}
}
bool img_zoom(img_t *img, float z)
{
if (img == NULL || img->im == NULL || img->win == NULL)
return false;
z = MAX(z, zoom_min);
z = MIN(z, zoom_max);
img->scalemode = SCALE_ZOOM;
if (zoomdiff(z, img->zoom) != 0) {
img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * z / img->zoom;
img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * z / img->zoom;
img->zoom = z;
img->checkpan = true;
img->dirty = true;
return true;
} else {
return false;
}
}
bool img_zoom_in(img_t *img)
{
int i;
float z;
if (img == NULL || img->im == NULL)
return false;
for (i = 1; i < ARRLEN(zoom_levels); i++) {
z = zoom_levels[i] / 100.0;
if (zoomdiff(z, img->zoom) > 0)
return img_zoom(img, z);
}
return false;
}
bool img_zoom_out(img_t *img)
{
int i;
float z;
if (img == NULL || img->im == NULL)
return false;
for (i = ARRLEN(zoom_levels) - 2; i >= 0; i--) {
z = zoom_levels[i] / 100.0;
if (zoomdiff(z, img->zoom) < 0)
return img_zoom(img, z);
}
return false;
}
bool img_move(img_t *img, float dx, float dy)
{
float ox, oy;
if (img == NULL || img->im == NULL)
return false;
ox = img->x;
oy = img->y;
img->x += dx;
img->y += dy;
img_check_pan(img, true);
if (ox != img->x || oy != img->y) {
img->dirty = true;
return true;
} else {
return false;
}
}
bool img_pan(img_t *img, direction_t dir, int d)
{
/* d < 0: screen-wise
* d = 0: 1/5 of screen
* d > 0: num of pixels
*/
float x, y;
if (img == NULL || img->im == NULL || img->win == NULL)
return false;
if (d > 0) {
x = y = MAX(1, (float) d * img->zoom);
} else {
x = img->win->w / (d < 0 ? 1 : 5);
y = img->win->h / (d < 0 ? 1 : 5);
}
switch (dir) {
case DIR_LEFT:
return img_move(img, x, 0.0);
case DIR_RIGHT:
return img_move(img, -x, 0.0);
case DIR_UP:
return img_move(img, 0.0, y);
case DIR_DOWN:
return img_move(img, 0.0, -y);
}
return false;
}
bool img_pan_edge(img_t *img, direction_t dir)
{
int ox, oy;
if (img == NULL || img->im == NULL || img->win == NULL)
return false;
ox = img->x;
oy = img->y;
switch (dir) {
case DIR_LEFT:
img->x = 0;
break;
case DIR_RIGHT:
img->x = img->win->w - img->w * img->zoom;
break;
case DIR_UP:
img->y = 0;
break;
case DIR_DOWN:
img->y = img->win->h - img->h * img->zoom;
break;
}
img_check_pan(img, true);
if (ox != img->x || oy != img->y) {
img->dirty = true;
return true;
} else {
return false;
}
}
void img_rotate(img_t *img, degree_t d)
{
int i, ox, oy, tmp;
if (img == NULL || img->im == NULL || img->win == NULL)
return;
imlib_context_set_image(img->im);
imlib_image_orientate(d);
for (i = 0; i < img->multi.cnt; i++) {
if (i != img->multi.sel) {
imlib_context_set_image(img->multi.frames[i].im);
imlib_image_orientate(d);
}
}
if (d == DEGREE_90 || d == DEGREE_270) {
ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
img->x = oy + (img->win->w - img->win->h) / 2;
img->y = ox + (img->win->h - img->win->w) / 2;
tmp = img->w;
img->w = img->h;
img->h = tmp;
img->checkpan = true;
}
img->dirty = true;
}
void img_flip(img_t *img, flipdir_t d)
{
int i;
void (*imlib_flip_op[3])(void) = {
imlib_image_flip_horizontal,
imlib_image_flip_vertical,
imlib_image_flip_diagonal
};
d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
if (img == NULL || img->im == NULL || d < 0 || d >= ARRLEN(imlib_flip_op))
return;
imlib_context_set_image(img->im);
imlib_flip_op[d]();
for (i = 0; i < img->multi.cnt; i++) {
if (i != img->multi.sel) {
imlib_context_set_image(img->multi.frames[i].im);
imlib_flip_op[d]();
}
}
img->dirty = true;
}
void img_toggle_antialias(img_t *img)
{
if (img == NULL || img->im == NULL)
return;
img->aa = !img->aa;
imlib_context_set_image(img->im);
imlib_context_set_anti_alias(img->aa);
img->dirty = true;
}
bool img_change_gamma(img_t *img, int d)
{
/* d < 0: decrease gamma
* d = 0: reset gamma
* d > 0: increase gamma
*/
int gamma;
if (img == NULL || img->im == NULL)
return false;
if (d == 0)
gamma = 0;
else if (d < 0)
gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
else
gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
if (img->gamma != gamma) {
img->gamma = gamma;
img_apply_gamma(img);
img->dirty = true;
return true;
} else {
return false;
}
}
bool img_frame_goto(img_t *img, int n)
{
if (img == NULL || img->im == NULL)
return false;
if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
return false;
img->multi.sel = n;
img->im = img->multi.frames[n].im;
imlib_context_set_image(img->im);
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
img->checkpan = true;
img->dirty = true;
return true;
}
bool img_frame_navigate(img_t *img, int d)
{
if (img == NULL|| img->im == NULL || img->multi.cnt == 0 || d == 0)
return false;
d += img->multi.sel;
if (d < 0)
d = 0;
else if (d >= img->multi.cnt)
d = img->multi.cnt - 1;
return img_frame_goto(img, d);
}
bool img_frame_animate(img_t *img, bool restart)
{
if (img == NULL || img->im == NULL || img->multi.cnt == 0)
return false;
if (img->multi.sel + 1 >= img->multi.cnt) {
if (restart || GIF_LOOP == 1) {
img_frame_goto(img, 0);
} else if (GIF_LOOP == -1 && img->multi.repeat != 0) {
if (img->multi.repeat > 0)
img->multi.repeat--;
img_frame_goto(img, 0);
} else {
img->multi.animate = false;
return false;
}
} else if (!restart) {
img_frame_goto(img, img->multi.sel + 1);
}
img->multi.animate = true;
img->dirty = true;
return true;
}
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