add brightness and contrast (#396)
* Imlib2 supports modifying gamma, brightness and contrast directly while sxiv only supports gamma. Makes sense to extend it to brightness and contrast as well. * Since color corrections need to be aware of each other, they have been refactored into one centralized function. * This also makes the code more hackable as it makes it easier to add more color correction functions without them interfering with each other. Co-authored-by: 0ion9 <finticemo@gmail.com> Co-authored-by: NRK <nrk@disroot.org> Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/396 Reviewed-by: NRK <nrk@disroot.org> Reviewed-by: TAAPArthur <taaparthur@noreply.codeberg.org> Co-authored-by: Berke Kocaoğlu <kberke@metu.edu.tr> Co-committed-by: Berke Kocaoğlu <kberke@metu.edu.tr>
This commit is contained in:
parent
9cb9a54944
commit
95bc9b463b
23
commands.c
23
commands.c
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@ -222,15 +222,28 @@ bool cg_navigate_marked(arg_t n)
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return navigate_to(new);
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}
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bool cg_change_gamma(arg_t d)
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static bool change_color_modifier(arg_t d, int *target)
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{
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if (img_change_gamma(&img, d * (prefix > 0 ? prefix : 1))) {
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if (!img_change_color_modifier(&img, d * (prefix > 0 ? prefix : 1), target))
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return false;
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if (mode == MODE_THUMB)
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tns.dirty = 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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}
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bool cg_change_gamma(arg_t d)
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{
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return change_color_modifier(d, &img.gamma);
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}
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bool cg_change_brightness(arg_t d)
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{
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return change_color_modifier(d, &img.brightness);
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}
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bool cg_change_contrast(arg_t d)
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{
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return change_color_modifier(d, &img.contrast);
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}
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bool ci_navigate(arg_t n)
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@ -4,6 +4,8 @@
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/* global */
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bool cg_change_gamma(arg_t);
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bool cg_change_brightness(arg_t);
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bool cg_change_contrast(arg_t);
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bool cg_first(arg_t);
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bool cg_mark_range(arg_t);
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bool cg_n_or_last(arg_t);
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@ -47,6 +49,8 @@ bool ct_select(arg_t);
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#ifdef INCLUDE_MAPPINGS_CONFIG
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/* global */
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#define g_change_gamma { cg_change_gamma, MODE_ALL }
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#define g_change_brightness { cg_change_brightness, MODE_ALL }
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#define g_change_contrast { cg_change_contrast, MODE_ALL }
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#define g_first { cg_first, MODE_ALL }
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#define g_mark_range { cg_mark_range, MODE_ALL }
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#define g_n_or_last { cg_n_or_last, MODE_ALL }
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13
config.def.h
13
config.def.h
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@ -33,11 +33,14 @@ static const float zoom_levels[] = {
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/* default slideshow delay (in sec, overwritten via -S option): */
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static const int SLIDESHOW_DELAY = 5;
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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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/* color correction: the user-visible ranges [-CC_STEPS, 0] and
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* (0, CC_STEPS] are mapped to the ranges [0, 1], and (1, *_MAX].
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* Higher step count will have higher granulairy.
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*/
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static const int CC_STEPS = 32;
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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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static const double BRIGHTNESS_MAX = 2.0;
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static const double CONTRAST_MAX = 4.0;
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/* command i_scroll pans image 1/PAN_FRACTION of screen width/height */
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static const int PAN_FRACTION = 5;
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@ -118,6 +121,10 @@ static const keymap_t keys[] = {
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{ 0, XK_braceleft, g_change_gamma, -1 },
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{ 0, XK_braceright, g_change_gamma, +1 },
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{ ControlMask, XK_g, g_change_gamma, 0 },
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{ ControlMask, XK_bracketright, g_change_brightness, +1 },
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{ ControlMask, XK_bracketleft, g_change_brightness, -1 },
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{ 0, XK_parenleft, g_change_contrast, -1 },
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{ 0, XK_parenright, g_change_contrast, +1 },
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{ 0, XK_h, t_move_sel, DIR_LEFT },
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{ 0, XK_Left, t_move_sel, DIR_LEFT },
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20
etc/nsxiv.1
20
etc/nsxiv.1
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@ -209,6 +209,26 @@ steps.
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.TP
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.B Ctrl-g
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Reset gamma correction.
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.TP
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.B [
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Decrease brightness correction by
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.I count
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steps.
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.TP
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.B ]
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Increase brightness correction by
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.I count
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steps.
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.TP
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.B (
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Decrease contrast by
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.I count
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steps.
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.TP
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.B )
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Increase contrast by
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.I count
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steps.
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.SS Thumbnail mode
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The following keyboard commands are only available in thumbnail mode:
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.TP
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50
image.c
50
image.c
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@ -90,7 +90,9 @@ void img_init(img_t *img, win_t *win)
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img->cmod = imlib_create_color_modifier();
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imlib_context_set_color_modifier(img->cmod);
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img_change_gamma(img, options->gamma);
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img->brightness = 0;
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img->contrast = 0;
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img_change_color_modifier(img, options->gamma, &img->gamma);
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img->ss.on = options->slideshow > 0;
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img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10u;
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@ -840,32 +842,36 @@ void img_toggle_antialias(img_t *img)
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img->dirty = true;
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}
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bool img_change_gamma(img_t *img, int d)
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static double steps_to_range(int d, double max, double offset)
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{
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/* d < 0: decrease gamma
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* d = 0: reset gamma
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* d > 0: increase gamma
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*/
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int gamma;
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double range;
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return offset + d * ((d <= 0 ? 1.0 : (max - 1.0)) / CC_STEPS);
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}
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if (d == 0)
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gamma = 0;
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else
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gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
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if (img->gamma != gamma) {
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void img_update_color_modifiers(img_t *img)
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{
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assert(imlib_context_get_color_modifier() == img->cmod);
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imlib_reset_color_modifier();
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if (gamma) {
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range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
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imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
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}
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img->gamma = gamma;
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if (img->gamma != 0)
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imlib_modify_color_modifier_gamma(steps_to_range(img->gamma, GAMMA_MAX, 1.0));
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if (img->brightness != 0)
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imlib_modify_color_modifier_brightness(steps_to_range(img->brightness, BRIGHTNESS_MAX, 0.0));
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if (img->contrast != 0)
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imlib_modify_color_modifier_contrast(steps_to_range(img->contrast, CONTRAST_MAX, 1.0));
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img->dirty = true;
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return true;
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} else {
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}
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bool img_change_color_modifier(img_t *img, int d, int *target)
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{
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int value = d == 0 ? 0 : MIN(MAX(*target + d, -CC_STEPS), CC_STEPS);
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if (*target == value)
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return false;
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}
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*target = value;
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img_update_color_modifiers(img);
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return true;
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}
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static bool img_frame_goto(img_t *img, int n)
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4
main.c
4
main.c
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@ -444,6 +444,10 @@ static void update_info(void)
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}
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if (img.gamma)
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bar_put(r, "G%+d" BAR_SEP, img.gamma);
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if (img.brightness)
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bar_put(r, "B%+d" BAR_SEP, img.brightness);
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if (img.contrast)
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bar_put(r, "C%+d" BAR_SEP, img.contrast);
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bar_put(r, "%3d%%" BAR_SEP, (int) (img.zoom * 100.0));
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if (img.multi.cnt > 0) {
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for (fn = 0, i = img.multi.cnt; i > 0; fn++, i /= 10);
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5
nsxiv.h
5
nsxiv.h
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@ -181,6 +181,8 @@ struct img {
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Imlib_Color_Modifier cmod;
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int gamma;
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int brightness;
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int contrast;
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scalemode_t scalemode;
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float zoom;
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@ -212,7 +214,8 @@ bool img_pan_edge(img_t*, direction_t);
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void img_rotate(img_t*, degree_t);
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void img_flip(img_t*, flipdir_t);
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void img_toggle_antialias(img_t*);
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bool img_change_gamma(img_t*, int);
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void img_update_color_modifiers(img_t*);
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bool img_change_color_modifier(img_t*, int, int*);
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bool img_frame_navigate(img_t*, int);
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bool img_frame_animate(img_t*);
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Imlib_Image img_open(const fileinfo_t*);
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