Add support for changing the gamma value
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450c1ed9b5
commit
0353e6eea2
16
commands.c
16
commands.c
@ -474,6 +474,22 @@ bool i_toggle_antialias(arg_t a)
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}
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}
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/* a < 0: decrease gamma
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* a == 0: reset gamma
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* a > 0: increase gamma
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*/
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bool i_change_gamma(arg_t a)
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{
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if (mode == MODE_IMAGE) {
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long val = (long) a;
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int delta = val > 0 ? 1 : (val < 0 ? -1 : -img.gamma);
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img_set_gamma(&img, img.gamma + delta);
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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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}
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bool it_toggle_alpha(arg_t a)
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{
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img.alpha = tns.alpha = !img.alpha;
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@ -67,6 +67,7 @@ bool i_fit_to_img(arg_t);
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bool i_rotate(arg_t);
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bool i_flip(arg_t);
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bool i_toggle_antialias(arg_t);
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bool i_change_gamma(arg_t);
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bool it_toggle_alpha(arg_t);
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bool it_open_with(arg_t);
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bool it_shell_cmd(arg_t);
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11
config.def.h
11
config.def.h
@ -46,6 +46,12 @@ enum {
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GIF_LOOP = 0 /* endless loop [0/1] */
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};
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/* gamma correction: the user-visible ranges [-GAMMA_RANGE, 0] and
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* (0, GAMMA_RANGE] are mapped to the ranges [0, 1], and (1, GAMMA_MAX].
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* */
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static const double GAMMA_MAX = 10.0;
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static const int GAMMA_RANGE = 32;
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#endif
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#ifdef _THUMBS_CONFIG
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@ -141,6 +147,11 @@ static const keymap_t keys[] = {
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{ false, XK_a, i_toggle_antialias, (arg_t) None },
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{ false, XK_A, it_toggle_alpha, (arg_t) None },
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/* decrease/increase/reset gamma */
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{ false, XK_braceleft, i_change_gamma, (arg_t) -1 },
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{ false, XK_braceright, i_change_gamma, (arg_t) +1 },
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{ true, XK_G, i_change_gamma, (arg_t) 0 },
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/* open current image with given program: */
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{ true, XK_g, it_open_with, (arg_t) "gimp" },
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30
image.c
30
image.c
@ -67,6 +67,9 @@ void img_init(img_t *img, win_t *win)
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img->alpha = !RENDER_WHITE_ALPHA;
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img->multi.cap = img->multi.cnt = 0;
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img->multi.animate = false;
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img->cmod = imlib_create_color_modifier();
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img_set_gamma(img, options->gamma);
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}
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void exif_auto_orientate(const fileinfo_t *file)
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@ -303,6 +306,8 @@ bool img_load(img_t *img, const fileinfo_t *file)
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img_load_gif(img, file);
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#endif
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img_set_gamma(img, img->gamma);
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img->w = imlib_image_get_width();
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img->h = imlib_image_get_height();
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img->scalemode = options->scalemode;
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@ -335,6 +340,9 @@ void img_close(img_t *img, bool decache)
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imlib_free_image();
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img->im = NULL;
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}
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if (img->cmod)
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imlib_context_set_color_modifier(NULL);
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}
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void img_check_pan(img_t *img, bool moved)
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@ -706,6 +714,28 @@ void img_toggle_antialias(img_t *img)
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img->dirty = true;
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}
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void img_set_gamma(img_t *img, int gamma)
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{
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if (img == NULL)
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return;
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img->gamma = MIN(MAX(gamma, -GAMMA_RANGE), GAMMA_RANGE);
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if (img->im && img->cmod) {
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if (img->gamma == 0) {
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imlib_context_set_color_modifier(NULL);
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} else {
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double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
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imlib_context_set_color_modifier(img->cmod);
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imlib_reset_color_modifier();
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imlib_modify_color_modifier_gamma(
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1.0 + (double) img->gamma
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* (range / (double) GAMMA_RANGE));
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}
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img->dirty = true;
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}
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}
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bool img_frame_goto(img_t *img, int n)
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{
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if (img == NULL || img->im == NULL)
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5
image.h
5
image.h
@ -55,6 +55,9 @@ typedef struct {
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bool aa;
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bool alpha;
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Imlib_Color_Modifier cmod;
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int gamma;
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multi_img_t multi;
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} img_t;
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@ -81,6 +84,8 @@ void img_flip(img_t*, flipdir_t);
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void img_toggle_antialias(img_t*);
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void img_set_gamma(img_t*, int);
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bool img_frame_navigate(img_t*, int);
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bool img_frame_animate(img_t*, bool);
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2
main.c
2
main.c
@ -352,6 +352,8 @@ void update_info(void)
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n += snprintf(rt + n, rlen - n, "%0*d/%d | ",
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fn, img.multi.sel + 1, img.multi.cnt);
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}
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if (img.gamma != 0)
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n += snprintf(rt + n, rlen - n, "g%d | ", img.gamma);
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n += snprintf(rt + n, rlen - n, "%0*d/%d", fw, sel + 1, filecnt);
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ow_info = info.script == NULL;
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}
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15
options.c
15
options.c
@ -33,7 +33,7 @@ const options_t *options = (const options_t*) &_options;
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void print_usage(void)
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{
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printf("usage: sxiv [-bcdFfhioqrstvZ] [-g GEOMETRY] [-n NUM] "
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printf("usage: sxiv [-bcdFfhioqrstvZ] [-g GEOMETRY] [-G GAMMA] [-n NUM] "
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"[-N name] [-z ZOOM] FILES...\n");
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}
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@ -44,7 +44,7 @@ void print_version(void)
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void parse_options(int argc, char **argv)
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{
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int opt, t;
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int opt, t, gamma;
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_options.from_stdin = false;
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_options.to_stdout = false;
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@ -53,6 +53,7 @@ void parse_options(int argc, char **argv)
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_options.scalemode = SCALE_MODE;
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_options.zoom = 1.0;
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_options.gamma = 0;
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_options.fixed_win = false;
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_options.fullscreen = false;
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@ -64,7 +65,7 @@ void parse_options(int argc, char **argv)
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_options.thumb_mode = false;
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_options.clean_cache = false;
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while ((opt = getopt(argc, argv, "bcdFfg:hin:N:oqrstvZz:")) != -1) {
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while ((opt = getopt(argc, argv, "bcdFfg:G:hin:N:oqrstvZz:")) != -1) {
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switch (opt) {
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case '?':
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print_usage();
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@ -87,6 +88,14 @@ void parse_options(int argc, char **argv)
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case 'g':
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_options.geometry = optarg;
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break;
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case 'G':
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if (sscanf(optarg, "%d", &gamma) <= 0) {
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fprintf(stderr, "sxiv: invalid argument for option -G: %s\n",
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optarg);
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exit(EXIT_FAILURE);
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}
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_options.gamma = gamma;
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break;
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case 'h':
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print_usage();
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exit(EXIT_SUCCESS);
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@ -34,6 +34,7 @@ typedef struct {
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/* image: */
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scalemode_t scalemode;
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float zoom;
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int gamma;
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/* window: */
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bool fixed_win;
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13
sxiv.1
13
sxiv.1
@ -49,6 +49,9 @@ Set window position and size. See section GEOMETRY SPECIFICATIONS of X(7) for
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more information on
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.IR GEOMETRY .
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.TP
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.BI "\-G " GAMMA
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Set gamma to GAMMA (-32..32).
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.TP
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.BI "\-n " NUM
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Start at picture number NUM.
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.TP
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@ -282,6 +285,16 @@ Flip image horizontally.
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.TP
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.B _
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Flip image vertically.
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.SS Gamma Correction
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.TP
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.B {
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Decrease gamma.
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.TP
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.B }
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Increase gamma.
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.TP
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.B Ctrl-G
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Reset gamma.
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.SS Miscellaneous
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.TP
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.B a
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