nsxiv/image.c

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/* Copyright 2011-2020 Bert Muennich
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* Copyright 2021-2023 nsxiv contributors
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*
* This file is a part of nsxiv.
*
* nsxiv 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 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,
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* 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/>.
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*/
#include "nsxiv.h"
#define INCLUDE_IMAGE_CONFIG
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
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#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#if HAVE_LIBEXIF
#include <libexif/exif-data.h>
#endif
#if HAVE_IMLIB2_MULTI_FRAME
enum { DEF_ANIM_DELAY = 75 };
#endif
#define ZOOM_MIN (zoom_levels[0] / 100)
#define ZOOM_MAX (zoom_levels[ARRLEN(zoom_levels) - 1] / 100)
static int calc_cache_size(void)
{
long cache, pages = -1, page_size = -1;
if (CACHE_SIZE_MEM_PERCENTAGE <= 0)
return 0;
#ifdef _SC_PHYS_PAGES /* _SC_PHYS_PAGES isn't POSIX */
pages = sysconf(_SC_PHYS_PAGES);
page_size = sysconf(_SC_PAGE_SIZE);
#endif
if (pages < 0 || page_size < 0)
return CACHE_SIZE_FALLBACK;
cache = (pages / 100) * CACHE_SIZE_MEM_PERCENTAGE;
cache *= page_size;
return MIN(cache, CACHE_SIZE_LIMIT);
}
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(calc_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;
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img->anti_alias = options->anti_alias;
img->alpha_layer = options->alpha_layer;
set autoreload timeout based on the latest event (#459) currently the autoreload feature of nsxiv is a bit unreliable because we try to load at the very first event we received. however, the writer might not be done writing and so we might try to load a truncated image (and fail). in the following ascii diagram, function S represents sleep and `+` sign represents writes by the writer. because we set the sleep (of 10ms) at the first event, subsequent writes by the writer doesn't influence our reload logic: S(10) load() nsxiv | | writer + + + + (done) time(ms): 00 05 10 15 after this patch, (assuming function T (re)sets a timeout), we will keep (re)setting a timeout on new events giving the writer more time to finish: T(10) T(10) T(10) T(10) load() nsxiv | | | | | writer + + + + (done) time(ms): 00 05 10 15 20 25 while this patch makes things significantly more robust, the problem here is inherently unsolvable since there's no way to tell whether the writer is done writing or not. for example, if user does something like `curl 'some.png' > test.png` then curl might stop for a second or two in the middle of writing due to internet issues - which will make nsxiv drop the image. this patch also increases the autoreload delay from 10ms to now 128ms instead to decrease chances of false failures. ref: https://github.com/0ion9/sxiv/commit/6ae2df6ed549c2cc119bd7d235b75154fc042d2d partially-fixes: https://codeberg.org/nsxiv/nsxiv/issues/456 commit-message-by: NRK Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/459 Reviewed-by: eylles <eylles@noreply.codeberg.org>
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img->autoreload_pending = false;
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->brightness = 0;
img->contrast = 0;
img_change_color_modifier(img, options->gamma, &img->gamma);
img->ss.on = options->slideshow > 0;
img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10u;
}
#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_IMLIB2_MULTI_FRAME
static void img_area_clear(int x, int y, int w, int h)
{
assert(x >= 0 && y >= 0);
assert(w > 0 && h > 0);
imlib_image_set_has_alpha(1);
imlib_context_set_blend(0);
imlib_context_set_color(0, 0, 0, 0);
imlib_image_fill_rectangle(x, y, w, h);
}
static bool img_load_multiframe(img_t *img, const fileinfo_t *file)
{
unsigned int n, fcnt;
Imlib_Image blank;
Imlib_Frame_Info finfo;
int px, py, pw, ph, pflag;
multi_img_t *m = &img->multi;
imlib_context_set_image(img->im);
imlib_image_get_frame_info(&finfo);
if ((fcnt = finfo.frame_count) <= 1 || !(finfo.frame_flags & IMLIB_IMAGE_ANIMATED))
return false;
img->w = finfo.canvas_w;
img->h = finfo.canvas_h;
if (fcnt > m->cap) {
m->cap = fcnt;
m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
}
if ((blank = imlib_create_image(img->w, img->h)) == NULL) {
error(0, 0, "%s: couldn't create image", file->name);
return false;
}
imlib_context_set_image(blank);
img_area_clear(0, 0, img->w, img->h);
imlib_context_set_dither(0);
imlib_context_set_anti_alias(0);
imlib_context_set_color_modifier(NULL);
imlib_context_set_operation(IMLIB_OP_COPY);
/*
* Imlib2 gives back a "raw frame", we need to blend it on top of the
* previous frame ourselves if necessary to get the fully decoded frame.
*/
pflag = m->length = m->cnt = m->sel = 0;
px = py = pw = ph = 0;
for (n = 1; n <= fcnt; ++n) {
Imlib_Image frame, canvas;
int sx, sy, sw, sh;
bool has_alpha;
imlib_context_set_image(m->cnt < 1 ? blank : m->frames[m->cnt - 1].im);
canvas = imlib_clone_image();
if ((frame = imlib_load_image_frame(file->path, n)) != NULL) {
imlib_context_set_image(frame);
imlib_image_set_changes_on_disk(); /* see img_load() for rationale */
imlib_image_get_frame_info(&finfo);
}
/* NOTE: the underlying file can end up changing during load.
* so check if frame_count, w, h are all still the same or not.
*/
if (canvas == NULL || frame == NULL || finfo.frame_count != (int)fcnt ||
finfo.canvas_w != img->w || finfo.canvas_h != img->h)
{
img_free(frame, false);
img_free(canvas, false);
error(0, 0, "%s: failed to load frame %d", file->name, n);
break;
}
sx = finfo.frame_x;
sy = finfo.frame_y;
sw = finfo.frame_w;
sh = finfo.frame_h;
has_alpha = imlib_image_has_alpha();
imlib_context_set_image(canvas);
/* the dispose flags are explained in Imlib2's header */
if (pflag & IMLIB_FRAME_DISPOSE_CLEAR) {
img_area_clear(px, py, pw, ph);
} else if (pflag & IMLIB_FRAME_DISPOSE_PREV) {
Imlib_Image p = m->cnt < 2 ? blank : m->frames[m->cnt - 2].im;
assert(m->cnt > 0);
img_area_clear(0, 0, img->w, img->h);
imlib_blend_image_onto_image(p, 1, px, py, pw, ph, px, py, pw, ph);
}
pflag = finfo.frame_flags;
if (pflag & (IMLIB_FRAME_DISPOSE_CLEAR | IMLIB_FRAME_DISPOSE_PREV)) {
/* remember these so we can "dispose" them before blending next frame */
px = sx;
py = sy;
pw = sw;
ph = sh;
}
assert(imlib_context_get_operation() == IMLIB_OP_COPY);
imlib_image_set_has_alpha(has_alpha);
imlib_context_set_blend(!!(finfo.frame_flags & IMLIB_FRAME_BLEND));
imlib_blend_image_onto_image(frame, has_alpha, 0, 0, sw, sh, sx, sy, sw, sh);
m->frames[m->cnt].im = canvas;
m->frames[m->cnt].delay = finfo.frame_delay ? finfo.frame_delay : DEF_ANIM_DELAY;
m->length += m->frames[m->cnt].delay;
m->cnt++;
img_free(frame, false);
}
img_free(blank, false);
imlib_context_set_color_modifier(img->cmod); /* restore cmod */
if (m->cnt > 1) {
img_free(img->im, false);
img->im = m->frames[0].im;
} else if (m->cnt == 1) {
img_free(m->frames[0].im, false);
m->cnt = 0;
}
imlib_context_set_image(img->im);
return m->cnt > 0;
}
#endif /* HAVE_IMLIB2_MULTI_FRAME */
Imlib_Image img_open(const fileinfo_t *file)
{
struct stat st;
Imlib_Image im = NULL;
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if (access(file->path, R_OK) == 0 &&
stat(file->path, &st) == 0 && S_ISREG(st.st_mode) &&
#if HAVE_IMLIB2_MULTI_FRAME
(im = imlib_load_image_frame(file->path, 1)) != NULL)
#else
(im = imlib_load_image_immediately(file->path)) != NULL)
#endif
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{
imlib_context_set_image(im);
}
/* UPGRADE: Imlib2 v1.10.0: better error reporting with
* imlib_get_error() + imlib_strerror() */
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;
bool animated = false;
if ((img->im = img_open(file)) == NULL)
return false;
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/* ensure that the image's timestamp is checked when loading from cache
* to avoid issues like: https://codeberg.org/nsxiv/nsxiv/issues/436
*/
imlib_image_set_changes_on_disk();
/* UPGRADE: Imlib2 v1.7.5: remove these exif related ifdefs */
/* since v1.7.5, Imlib2 can parse exif orientation from jpeg files.
* this version also happens to be the first one which defines the
* IMLIB2_VERSION macro.
*/
#if HAVE_LIBEXIF && !defined(IMLIB2_VERSION)
exif_auto_orientate(file);
#endif
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#if HAVE_IMLIB2_MULTI_FRAME
animated = img_load_multiframe(img, file);
#endif
(void)fmt; /* maybe unused */
#if HAVE_LIBEXIF && defined(IMLIB2_VERSION)
if ((fmt = imlib_image_format()) != NULL) {
if (!STREQ(fmt, "jpeg") && !STREQ(fmt, "jpg"))
exif_auto_orientate(file);
}
#endif
/* for animated images, we want the _canvas_ width/height, which
* img_load_multiframe() sets already.
*/
if (!animated) {
img->w = imlib_image_get_width();
img->h = imlib_image_get_height();
}
img->checkpan = true;
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img->dirty = true;
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return true;
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}
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CLEANUP void img_free(Imlib_Image im, bool decache)
{
if (im != NULL) {
imlib_context_set_image(im);
decache ? imlib_free_image_and_decache() : imlib_free_image();
}
}
CLEANUP void img_close(img_t *img, bool decache)
{
unsigned int i;
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if (img->multi.cnt > 0) {
for (i = 0; i < img->multi.cnt; i++)
img_free(img->multi.frames[i].im, decache);
/* NOTE: the above only decaches the "composed frames",
* and not the "raw frame" that's associated with the file.
* which leads to issues like: https://codeberg.org/nsxiv/nsxiv/issues/456
*/
#if HAVE_IMLIB2_MULTI_FRAME
#if IMLIB2_VERSION >= IMLIB2_VERSION_(1, 12, 0)
if (decache)
imlib_image_decache_file(files[fileidx].path);
#else /* UPGRADE: Imlib2 v1.12.0: remove this hack */
/* HACK: try to reload all the frames and forcefully decache them
* if imlib_image_decache_file() isn't available.
*/
for (i = 0; decache && i < img->multi.cnt; i++)
img_free(imlib_load_image_frame(files[fileidx].path, i + 1), true);
#endif
#endif
img->multi.cnt = 0;
img->im = NULL;
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} else if (img->im != NULL) {
img_free(img->im, decache);
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img->im = NULL;
}
}
static void img_check_pan(img_t *img, bool moved)
{
win_t *win;
float w, h, ox, oy;
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win = img->win;
w = img->w * img->zoom;
h = img->h * img->zoom;
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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;
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if (!moved && (ox != img->x || oy != img->y))
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img->dirty = true;
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}
static bool img_fit(img_t *img)
{
float z, zw, zh;
if (img->scalemode == SCALE_ZOOM)
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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)) {
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img->zoom = z;
img->dirty = true;
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return true;
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} else {
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return false;
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}
}
void img_render(img_t *img)
{
win_t *win;
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int sx, sy, sw, sh;
int dx, dy, dw, dh;
Imlib_Image bg;
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win = img->win;
img_fit(img);
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if (img->checkpan) {
img_check_pan(img, false);
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img->checkpan = false;
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}
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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;
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sw = win->w / img->zoom;
dx = 0;
dw = win->w;
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} else {
sx = 0;
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sw = img->w;
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dx = img->x;
dw = MAX(img->w * img->zoom, 1);
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}
if (img->y <= 0) {
sy = -img->y / img->zoom + 0.5;
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sh = win->h / img->zoom;
dy = win->bar.top ? win->bar.h : 0;
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dh = win->h;
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} else {
sy = 0;
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sh = img->h;
dy = img->y + (win->bar.top ? win->bar.h : 0);
dh = MAX(img->h * img->zoom, 1);
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}
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win_clear(win);
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imlib_context_set_image(img->im);
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imlib_context_set_anti_alias(img->anti_alias);
imlib_context_set_drawable(win->buf.pm);
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/* manual blending, for performance reasons.
* see https://phab.enlightenment.org/T8969#156167 for more details.
*/
if (imlib_image_has_alpha()) {
if ((bg = imlib_create_image(dw, dh)) == NULL) {
error(0, ENOMEM, "Failed to create image");
goto fallback;
}
imlib_context_set_image(bg);
imlib_image_set_has_alpha(0);
if (img->alpha_layer) {
int i, c, r;
uint32_t col[2] = { 0xFF666666, 0xFF999999 };
uint32_t *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 {
XColor 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_context_set_blend(1);
imlib_context_set_operation(IMLIB_OP_COPY);
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 {
fallback:
imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
}
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img->dirty = false;
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}
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bool img_fit_win(img_t *img, scalemode_t sm)
{
float oz;
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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;
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return true;
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} else {
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return false;
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}
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}
bool img_zoom_to(img_t *img, float z)
{
int x, y;
if (ZOOM_MIN <= z && z <= ZOOM_MAX) {
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win_cursor_pos(img->win, &x, &y);
if (x < 0 || (unsigned int)x >= img->win->w ||
y < 0 || (unsigned int)y >= img->win->h)
{
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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;
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img->zoom = z;
img->scalemode = SCALE_ZOOM;
img->dirty = img->checkpan = true;
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return true;
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} else {
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return false;
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}
}
bool img_zoom(img_t *img, int d)
{
int i = d > 0 ? 0 : (int)ARRLEN(zoom_levels) - 1;
while (i >= 0 && i < (int)ARRLEN(zoom_levels) &&
(d > 0 ? zoom_levels[i] / 100 <= img->zoom : zoom_levels[i] / 100 >= img->zoom))
{
i += d;
}
i = MIN(MAX(i, 0), (int)ARRLEN(zoom_levels) - 1);
return img_zoom_to(img, zoom_levels[i] / 100);
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}
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bool img_pos(img_t *img, float x, float y)
{
float ox, oy;
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ox = img->x;
oy = img->y;
img->x = x;
img->y = y;
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img_check_pan(img, true);
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if (ox != img->x || oy != img->y) {
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img->dirty = true;
return true;
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} else {
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return false;
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}
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}
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
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* 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 {
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x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
}
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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);
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}
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return false;
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}
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bool img_pan_center(img_t *img)
{
float x, y;
x = (img->win->w - img->w * img->zoom) / 2.0;
y = (img->win->h - img->h * img->zoom) / 2.0;
return img_pos(img, x, y);
}
bool img_pan_edge(img_t *img, direction_t dir)
{
float ox, oy;
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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;
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img_check_pan(img, true);
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if (ox != img->x || oy != img->y) {
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img->dirty = true;
return true;
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} else {
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return false;
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}
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}
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void img_rotate(img_t *img, degree_t d)
{
unsigned int i, tmp;
float ox, oy;
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imlib_context_set_image(img->im);
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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);
}
}
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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 + (int)(img->win->w - img->win->h) / 2;
img->y = ox + (int)(img->win->h - img->win->w) / 2;
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tmp = img->w;
img->w = img->h;
img->h = tmp;
img->checkpan = true;
}
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img->dirty = true;
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}
void img_flip(img_t *img, flipdir_t d)
{
unsigned 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;
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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]();
}
}
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img->dirty = true;
}
void img_toggle_antialias(img_t *img)
{
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img->anti_alias = !img->anti_alias;
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imlib_context_set_image(img->im);
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imlib_context_set_anti_alias(img->anti_alias);
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img->dirty = true;
}
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static double steps_to_range(int d, double max, double offset)
{
return offset + d * ((d <= 0 ? 1.0 : (max - 1.0)) / CC_STEPS);
}
void img_update_color_modifiers(img_t *img)
{
assert(imlib_context_get_color_modifier() == img->cmod);
imlib_reset_color_modifier();
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if (img->gamma != 0)
imlib_modify_color_modifier_gamma(steps_to_range(img->gamma, GAMMA_MAX, 1.0));
if (img->brightness != 0)
imlib_modify_color_modifier_brightness(steps_to_range(img->brightness, BRIGHTNESS_MAX, 0.0));
if (img->contrast != 0)
imlib_modify_color_modifier_contrast(steps_to_range(img->contrast, CONTRAST_MAX, 1.0));
img->dirty = true;
}
bool img_change_color_modifier(img_t *img, int d, int *target)
{
int value = d == 0 ? 0 : MIN(MAX(*target + d, -CC_STEPS), CC_STEPS);
if (*target == value)
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return false;
*target = value;
img_update_color_modifiers(img);
return true;
}
static bool img_frame_goto(img_t *img, int n)
{
if (n < 0 || (unsigned int)n >= img->multi.cnt || (unsigned int)n == img->multi.sel)
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return false;
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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();
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img->checkpan = true;
img->dirty = true;
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return true;
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}
bool img_frame_navigate(img_t *img, int d)
{
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if (img->multi.cnt == 0 || d == 0)
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return false;
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d += img->multi.sel;
d = MAX(0, MIN(d, (int)img->multi.cnt - 1));
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return img_frame_goto(img, d);
}
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bool img_frame_animate(img_t *img)
{
if (img->multi.cnt > 0)
return img_frame_goto(img, (img->multi.sel + 1) % img->multi.cnt);
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else
return false;
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}