Apply gamma value on thumbnails too; fixes issue #193

Makefile

@@ -1,4 +1,4 @@
-VERSION   := git-20150104
+VERSION   := git-20150105
 
 PREFIX    := /usr/local
 MANPREFIX := $(PREFIX)/share/man

commands.c

@@ -260,6 +260,17 @@ bool cg_navigate_marked(arg_t a)
 	}
 }
 
+bool cg_change_gamma(arg_t a)
+{
+	if (img_change_gamma(&img, (long) a * (prefix > 0 ? prefix : 1))) {
+		if (mode == MODE_THUMB)
+			tns.dirty = true;
+		return true;
+	} else {
+		return false;
+	}
+}
+
 bool ci_navigate(arg_t a)
 {
 	long n = (long) a;
@@ -419,11 +430,6 @@ bool ci_flip(arg_t a)
 	return true;
 }
 
-bool ci_change_gamma(arg_t a)
-{
-	return img_change_gamma(&img, (long) a);
-}
-
 bool ci_toggle_antialias(arg_t a)
 {
 	img_toggle_antialias(&img);

commands.lst

@@ -13,6 +13,7 @@ G_CMD(toggle_image_mark)
 G_CMD(reverse_marks)
 G_CMD(unmark_all)
 G_CMD(navigate_marked)
+G_CMD(change_gamma)
 
 I_CMD(navigate)
 I_CMD(alternate)
@@ -25,7 +26,6 @@ I_CMD(set_zoom)
 I_CMD(fit_to_win)
 I_CMD(rotate)
 I_CMD(flip)
-I_CMD(change_gamma)
 I_CMD(toggle_antialias)
 I_CMD(toggle_alpha)
 I_CMD(slideshow)

config.def.h

@@ -88,6 +88,9 @@ static const keymap_t keys[] = {
 	{ ControlMask,  XK_m,             g_unmark_all,         (arg_t) None },
 	{ 0,            XK_N,             g_navigate_marked,    (arg_t) +1 },
 	{ 0,            XK_P,             g_navigate_marked,    (arg_t) -1 },
+	{ 0,            XK_braceleft,     g_change_gamma,       (arg_t) -1 },
+	{ 0,            XK_braceright,    g_change_gamma,       (arg_t) +1 },
+	{ ControlMask,  XK_g,             g_change_gamma,       (arg_t)  0 },
 
 	{ 0,            XK_h,             t_move_sel,           (arg_t) DIR_LEFT },
 	{ 0,            XK_Left,          t_move_sel,           (arg_t) DIR_LEFT },
@@ -133,9 +136,6 @@ static const keymap_t keys[] = {
 	{ 0,            XK_question,      i_rotate,             (arg_t) DEGREE_180 },
 	{ 0,            XK_bar,           i_flip,               (arg_t) FLIP_HORIZONTAL },
 	{ 0,            XK_underscore,    i_flip,               (arg_t) FLIP_VERTICAL },
-	{ 0,            XK_braceleft,     i_change_gamma,       (arg_t) -1 },
-	{ 0,            XK_braceright,    i_change_gamma,       (arg_t) +1 },
-	{ ControlMask,  XK_g,             i_change_gamma,       (arg_t)  0 },
 	{ 0,            XK_a,             i_toggle_antialias,   (arg_t) None },
 	{ 0,            XK_A,             i_toggle_alpha,       (arg_t) None },
 	{ 0,            XK_s,             i_slideshow,          (arg_t) None },

image.c

@@ -46,22 +46,6 @@ 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;
@@ -89,6 +73,7 @@ void img_init(img_t *img, win_t *win)
 	img->multi.length = 0;
 
 	img->cmod = imlib_create_color_modifier();
+	imlib_context_set_color_modifier(img->cmod);
 	img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
 
 	img->ss.on = options->slideshow > 0;
@@ -339,8 +324,6 @@ bool img_load(img_t *img, const fileinfo_t *file)
 			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;
@@ -371,9 +354,6 @@ void img_close(img_t *img, bool decache)
 			imlib_free_image();
 		img->im = NULL;
 	}
-
-	if (img->cmod)
-		imlib_context_set_color_modifier(NULL);
 }
 
 void img_check_pan(img_t *img, bool moved)
@@ -529,9 +509,7 @@ void img_render(img_t *img)
 		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);
@@ -771,20 +749,23 @@ bool img_change_gamma(img_t *img, int d)
 	 * d > 0: increase gamma
 	 */
 	int gamma;
+	double range;
 
-	if (img == NULL || img->im == NULL)
+	if (img == 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);
+		gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
 
 	if (img->gamma != gamma) {
+		imlib_reset_color_modifier();
+		if (gamma != 0) {
+			range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
+			imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
+		}
 		img->gamma = gamma;
-		img_apply_gamma(img);
 		img->dirty = true;
 		return true;
 	} else {