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zeniba-nsxiv/image.c
NRK ca7368aa89 Revert "fix: out-of-bounds access when bg not in color map" 
with this patch certain gif images will fail to play. one other problem
here is that it suddenly breaks the loop without free-ing data and rows,
leading to a memory leak.

regardless, this needs to be investigated further.

here's an example image where this happens:
https://i.postimg.cc/SQf1TJJg/awoo-study.gif

This reverts commit cca7834e67.
2021-11-26 15:36:05 +06:00

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/* Copyright 2011-2020 Bert Muennich
* Copyright 2021 nsxiv contributors
*
* This file is a part of nsxiv.
*
* nsxiv 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.
*
* nsxiv 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 nsxiv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "nsxiv.h"
#define _IMAGE_CONFIG
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#if HAVE_LIBEXIF
#include <libexif/exif-data.h>
#endif
#if HAVE_LIBGIF
#include <gif_lib.h>
enum { DEF_GIF_DELAY = 75 };
#endif
#if HAVE_LIBWEBP
#include <webp/decode.h>
#include <webp/demux.h>
enum { DEF_WEBP_DELAY = 75 };
#endif
void img_init(img_t *img, win_t *win)
{
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
imlib_set_cache_size(CACHE_SIZE);
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 = options->animate;
img->multi.framedelay = options->framerate > 0 ? 1000 / options->framerate : 0;
img->multi.length = 0;
img->cmod = imlib_create_color_modifier();
imlib_context_set_color_modifier(img->cmod);
img_change_gamma(img, options->gamma);
img->ss.on = options->slideshow > 0;
img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10;
}
#if HAVE_LIBEXIF
void exif_auto_orientate(const fileinfo_t *file)
{
ExifData *ed;
ExifEntry *entry;
int byte_order, orientation = 0;
if ((ed = exif_data_new_from_file(file->path)) == NULL)
return;
byte_order = exif_data_get_byte_order(ed);
entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
if (entry != NULL)
orientation = exif_get_short(entry->data, byte_order);
exif_data_unref(ed);
switch (orientation) {
case 5:
imlib_image_orientate(1);
/* fall through */
case 2:
imlib_image_flip_vertical();
break;
case 3:
imlib_image_orientate(2);
break;
case 7:
imlib_image_orientate(1);
/* fall through */
case 4:
imlib_image_flip_horizontal();
break;
case 6:
imlib_image_orientate(1);
break;
case 8:
imlib_image_orientate(3);
break;
}
}
#endif
#if HAVE_LIBGIF
static 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 = emalloc(img->multi.cap * sizeof(img_frame_t));
}
img->multi.cnt = img->multi.sel = 0;
img->multi.length = 0;
#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
gif = DGifOpenFileName(file->path, NULL);
#else
gif = DGifOpenFileName(file->path);
#endif
if (gif == NULL) {
error(0, 0, "%s: Error opening gif image", 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]);
disposal = (unsigned int) ext[1] >> 2 & 0x7;
}
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 = emalloc(h * sizeof(GifRowType));
for (i = 0; i < h; i++)
rows[i] = emalloc(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 = emalloc(sw * sh * sizeof(DATA32));
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 = 0xffu << 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 = erealloc(img->multi.frames,
img->multi.cap * sizeof(img_frame_t));
}
img->multi.frames[img->multi.cnt].im = im;
delay = img->multi.framedelay > 0 ? img->multi.framedelay : delay;
img->multi.frames[img->multi.cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
img->multi.length += img->multi.frames[img->multi.cnt].delay;
img->multi.cnt++;
}
} while (rec != TERMINATE_RECORD_TYPE);
#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
DGifCloseFile(gif, NULL);
#else
DGifCloseFile(gif);
#endif
if (err && (file->flags & FF_WARN))
error(0, 0, "%s: Corrupted gif file", file->name);
if (img->multi.cnt > 1) {
imlib_context_set_image(img->im);
imlib_free_image();
img->im = img->multi.frames[0].im;
} else if (img->multi.cnt == 1) {
imlib_context_set_image(img->multi.frames[0].im);
imlib_free_image();
img->multi.cnt = 0;
}
imlib_context_set_image(img->im);
return !err;
}
#endif /* HAVE_LIBGIF */
#if HAVE_LIBWEBP
static bool is_webp(const char *path)
{
/* The size (in bytes) of the largest amount of data required to verify a WebP image. */
enum { max = 30 };
const unsigned char fmt[max];
bool ret = false;
FILE *f;
if ((f = fopen(path, "rb")) != NULL) {
if (fread((unsigned char *) fmt, 1, max, f) == max)
ret = WebPGetInfo(fmt, max, NULL, NULL);
fclose(f);
}
return ret;
}
/* fframe img
* NULL NULL = do nothing
* x NULL = load the first frame as an Imlib_Image
* NULL x = load all frames into img->multi.
*/
static bool img_load_webp(const fileinfo_t *file, Imlib_Image *fframe, img_t *img)
{
FILE *webp_file;
WebPData data;
Imlib_Image im = NULL;
struct WebPAnimDecoderOptions opts;
WebPAnimDecoder *dec = NULL;
struct WebPAnimInfo info;
unsigned char *buf = NULL;
int ts;
const WebPDemuxer *demux;
WebPIterator iter;
unsigned long flags;
unsigned int delay;
bool err = false;
data.bytes = NULL;
if ((err = fframe == NULL && img == NULL))
goto fail;
if ((err = (webp_file = fopen(file->path, "rb")) == NULL)) {
error(0, 0, "%s: Error opening webp image", file->name);
goto fail;
}
fseek(webp_file, 0L, SEEK_END);
data.size = ftell(webp_file);
rewind(webp_file);
data.bytes = emalloc(data.size);
if ((err = fread((unsigned char *)data.bytes, 1, data.size, webp_file) != data.size)) {
error(0, 0, "%s: Error reading webp image", file->name);
goto fail;
}
/* Setup the WebP Animation Decoder */
if ((err = !WebPAnimDecoderOptionsInit(&opts))) {
error(0, 0, "%s: WebP library version mismatch", file->name);
goto fail;
}
opts.color_mode = MODE_BGRA;
/* NOTE: Multi-threaded decoding may cause problems on some system */
opts.use_threads = true;
dec = WebPAnimDecoderNew(&data, &opts);
if ((err = (dec == NULL) || !WebPAnimDecoderGetInfo(dec, &info))) {
error(0, 0, "%s: WebP parsing or memory error (file is corrupt?)", file->name);
goto fail;
}
demux = WebPAnimDecoderGetDemuxer(dec);
if (img == NULL) { /* Only get the first frame and put it into fframe. */
if ((err = !WebPAnimDecoderGetNext(dec, &buf, &ts))) {
error(0, 0, "%s: Error loading first frame", file->name);
goto fail;
}
*fframe = imlib_create_image_using_copied_data(
info.canvas_width, info.canvas_height, (DATA32*)buf);
imlib_context_set_image(*fframe);
imlib_image_set_has_alpha(WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS) & ALPHA_FLAG);
} else {
/* Get global information for the image */
flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
img->w = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
img->h = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
if (img->multi.cap == 0) {
img->multi.cap = info.frame_count;
img->multi.frames = emalloc(img->multi.cap * sizeof(img_frame_t));
} else if (info.frame_count > img->multi.cap) {
img->multi.cap = info.frame_count;
img->multi.frames = erealloc(img->multi.frames,
img->multi.cap * sizeof(img_frame_t));
}
/* Load and decode frames (also works on images with only 1 frame) */
img->multi.cnt = img->multi.sel = 0;
while (WebPAnimDecoderGetNext(dec, &buf, &ts)) {
im = imlib_create_image_using_copied_data(
info.canvas_width, info.canvas_height, (DATA32*)buf);
imlib_context_set_image(im);
imlib_image_set_format("webp");
/* Get an iterator of this frame - used for frame info (duration, etc.) */
WebPDemuxGetFrame(demux, img->multi.cnt+1, &iter);
imlib_image_set_has_alpha((flags & ALPHA_FLAG) == ALPHA_FLAG);
/* Store info for this frame */
img->multi.frames[img->multi.cnt].im = im;
delay = iter.duration > 0 ? iter.duration : DEF_WEBP_DELAY;
img->multi.frames[img->multi.cnt].delay = delay;
img->multi.length += img->multi.frames[img->multi.cnt].delay;
img->multi.cnt++;
}
WebPDemuxReleaseIterator(&iter);
if (img->multi.cnt > 1) {
imlib_context_set_image(img->im);
imlib_free_image();
img->im = img->multi.frames[0].im;
} else if (img->multi.cnt == 1) {
imlib_context_set_image(img->multi.frames[0].im);
imlib_free_image();
img->multi.cnt = 0;
}
imlib_context_set_image(img->im);
}
imlib_image_set_format("webp");
fail:
if (dec != NULL)
WebPAnimDecoderDelete(dec);
free((unsigned char *)data.bytes);
return !err;
}
#endif /* HAVE_LIBWEBP */
Imlib_Image img_open(const fileinfo_t *file)
{
struct stat st;
Imlib_Image im = NULL;
if (access(file->path, R_OK) == 0 &&
stat(file->path, &st) == 0 && S_ISREG(st.st_mode))
{
#if HAVE_LIBWEBP
if (is_webp(file->path))
img_load_webp(file, &im, NULL);
else
#endif
im = imlib_load_image(file->path);
if (im != NULL) {
imlib_context_set_image(im);
if (imlib_image_get_data_for_reading_only() == NULL) {
imlib_free_image();
im = NULL;
}
}
}
if (im == NULL && (file->flags & FF_WARN))
error(0, 0, "%s: Error opening image", file->name);
return im;
}
bool img_load(img_t *img, const fileinfo_t *file)
{
const char *fmt;
if ((img->im = img_open(file)) == NULL)
return false;
imlib_image_set_changes_on_disk();
#if HAVE_LIBEXIF
exif_auto_orientate(file);
#endif
if ((fmt = imlib_image_format()) != NULL) {
#if HAVE_LIBGIF
if (STREQ(fmt, "gif"))
img_load_gif(img, file);
#endif
#if HAVE_LIBWEBP
if (STREQ(fmt, "webp"))
img_load_webp(file, NULL, img);
#endif
}
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
img->checkpan = true;
img->dirty = true;
return true;
}
CLEANUP void img_close(img_t *img, bool decache)
{
int i;
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;
}
}
static void img_check_pan(img_t *img, bool moved)
{
win_t *win;
float w, h, ox, oy;
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;
}
static bool img_fit(img_t *img)
{
float z, zw, zh;
if (img->scalemode == SCALE_ZOOM)
return false;
zw = (float) img->win->w / (float) img->w;
zh = (float) img->win->h / (float) img->h;
switch (img->scalemode) {
case SCALE_FILL:
z = MAX(zw, zh);
break;
case SCALE_WIDTH:
z = zw;
break;
case SCALE_HEIGHT:
z = zh;
break;
default:
z = MIN(zw, zh);
break;
}
z = MIN(z, img->scalemode == SCALE_DOWN ? 1.0 : ZOOM_MAX);
if (ABS(img->zoom - z) > 1.0/MAX(img->w, img->h)) {
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;
XColor c;
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 + 0.5;
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 + 0.5;
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->buf.pm);
if (imlib_image_has_alpha()) {
if ((bg = imlib_create_image(dw, dh)) == NULL)
error(EXIT_FAILURE, ENOMEM, NULL);
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->win_bg;
imlib_context_set_color(c.red >> 8, c.green >> 8, c.blue >> 8, 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();
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;
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_to(img_t *img, float z)
{
int x, y;
if (ZOOM_MIN <= z && z <= ZOOM_MAX) {
win_cursor_pos(img->win, &x, &y);
if (x < 0 || x >= img->win->w || y < 0 || y >= img->win->h) {
x = img->win->w / 2;
y = img->win->h / 2;
}
img->x = x - (x - img->x) * z / img->zoom;
img->y = y - (y - img->y) * z / img->zoom;
img->zoom = z;
img->scalemode = SCALE_ZOOM;
img->checkpan = true;
img->dirty = true;
return true;
} else {
return false;
}
}
bool img_zoom(img_t *img, int d)
{
const float z = img->zoom * (d > 0 ? ZOOM_STEP : 1/ZOOM_STEP);
return img_zoom_to(img, z);
}
bool img_pos(img_t *img, float x, float y)
{
float ox, oy;
ox = img->x;
oy = img->y;
img->x = x;
img->y = y;
img_check_pan(img, true);
if (ox != img->x || oy != img->y) {
img->dirty = true;
return true;
} else {
return false;
}
}
static bool img_move(img_t *img, float dx, float dy)
{
return img_pos(img, img->x + dx, img->y + dy);
}
bool img_pan(img_t *img, direction_t dir, int d)
{
/* d < 0: screen-wise
* d = 0: 1/PAN_FRACTION of screen
* d > 0: num of pixels
*/
float x, y;
if (d > 0) {
x = y = MAX(1, (float) d * img->zoom);
} else {
x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
}
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)
{
float ox, oy;
ox = img->x;
oy = img->y;
if (dir & DIR_LEFT)
img->x = 0;
if (dir & DIR_RIGHT)
img->x = img->win->w - img->w * img->zoom;
if (dir & DIR_UP)
img->y = 0;
if (dir & DIR_DOWN)
img->y = img->win->h - img->h * img->zoom;
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, tmp;
float ox, oy;
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 (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)
{
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;
double range;
if (d == 0)
gamma = 0;
else
gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
if (img->gamma != gamma) {
imlib_reset_color_modifier();
if (gamma) {
range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
}
img->gamma = gamma;
img->dirty = true;
return true;
} else {
return false;
}
}
static bool img_frame_goto(img_t *img, int n)
{
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->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)
{
if (img->multi.cnt == 0)
return false;
if (img->multi.sel + 1 >= img->multi.cnt)
img_frame_goto(img, 0);
else
img_frame_goto(img, img->multi.sel + 1);
img->dirty = true;
return true;
}
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