Refactored remote changes

commands.c

@@ -474,17 +474,10 @@ bool i_toggle_antialias(arg_t a)
 	}
 }
 
-/* a < 0:  decrease gamma
- * a == 0: reset gamma
- * a > 0:  increase gamma
- */
 bool i_change_gamma(arg_t a)
 {
 	if (mode == MODE_IMAGE) {
-		long val = (long) a;
-		int delta = val > 0 ? 1 : (val < 0 ? -1 : -img.gamma);
-		img_set_gamma(&img, img.gamma + delta);
-		return true;
+		return img_change_gamma(&img, (long) a);
 	} else {
 		return false;
 	}

image.c

@@ -39,11 +39,27 @@ enum { MIN_GIF_DELAY = 25 };
 float zoom_min;
 float zoom_max;
 
-int zoomdiff(float z1, float z2)
+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;
@@ -69,7 +85,7 @@ void img_init(img_t *img, win_t *win)
 	img->multi.animate = false;
 
 	img->cmod = imlib_create_color_modifier();
-	img_set_gamma(img, options->gamma);
+	img->gamma = options->gamma;
 }
 
 void exif_auto_orientate(const fileinfo_t *file)
@@ -306,7 +322,7 @@ bool img_load(img_t *img, const fileinfo_t *file)
 		img_load_gif(img, file);
 #endif
 
-	img_set_gamma(img, img->gamma);
+	img_apply_gamma(img);
 
 	img->w = imlib_image_get_width();
 	img->h = imlib_image_get_height();
@@ -714,25 +730,31 @@ void img_toggle_antialias(img_t *img)
 	img->dirty = true;
 }
 
-void img_set_gamma(img_t *img, int gamma)
+bool img_change_gamma(img_t *img, int d)
 {
-	if (img == NULL)
-		return;
+	/* d < 0: decrease gamma
+	 * d = 0: reset gamma
+	 * d > 0: increase gamma
+	 */
+	int gamma;
 
-	img->gamma = MIN(MAX(gamma, -GAMMA_RANGE), GAMMA_RANGE);
+	if (img == NULL || img->im == NULL)
+		return false;
 
-	if (img->im && img->cmod) {
-		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 + (double) img->gamma
-				* (range / (double) GAMMA_RANGE));
-		}
+	if (d == 0)
+		gamma = 0;
+	else if (d < 0)
+		gamma = MAX(-GAMMA_RANGE, img->gamma - 1);
+	else
+		gamma = MIN(+GAMMA_RANGE, img->gamma + 1);
+
+	if (img->gamma != gamma) {
+		img->gamma = gamma;
+		img_apply_gamma(img);
 		img->dirty = true;
+		return true;
+	} else {
+		return false;
 	}
 }
 

image.h

@@ -84,7 +84,7 @@ void img_flip(img_t*, flipdir_t);
 
 void img_toggle_antialias(img_t*);
 
-void img_set_gamma(img_t*, int);
+bool img_change_gamma(img_t*, int);
 
 bool img_frame_navigate(img_t*, int);
 bool img_frame_animate(img_t*, bool);

main.c

@@ -345,14 +345,15 @@ void update_info(void)
 			ow_info = false;
 		}
 	} else {
-		n = snprintf(rt, rlen, "%s%3d%% | ", mark, (int) (img.zoom * 100.0));
+		n = snprintf(rt, rlen, "%s", mark);
+		if (img.gamma != 0)
+			n += snprintf(rt + n, rlen - n, "G%+d | ", img.gamma);
+		n += snprintf(rt + n, rlen - n, "%3d%% | ", (int) (img.zoom * 100.0));
 		if (img.multi.cnt > 0) {
 			for (fn = 0, i = img.multi.cnt; i > 0; fn++, i /= 10);
 			n += snprintf(rt + n, rlen - n, "%0*d/%d | ",
 			              fn, img.multi.sel + 1, img.multi.cnt);
 		}
-		if (img.gamma != 0)
-			n += snprintf(rt + n, rlen - n, "g%d | ", img.gamma);
 		n += snprintf(rt + n, rlen - n, "%0*d/%d", fw, sel + 1, filecnt);
 		ow_info = info.script == NULL;
 	}

options.c

@@ -33,7 +33,7 @@ const options_t *options = (const options_t*) &_options;
 
 void print_usage(void)
 {
-	printf("usage: sxiv [-bcdFfhioqrstvZ] [-g GEOMETRY] [-G GAMMA] [-n NUM] "
+	printf("usage: sxiv [-bcdFfhioqrstvZ] [-G GAMMA] [-g GEOMETRY] [-n NUM] "
 	       "[-N name] [-z ZOOM] FILES...\n");
 }
 
@@ -45,6 +45,7 @@ void print_version(void)
 void parse_options(int argc, char **argv)
 {
 	int opt, t, gamma;
+	char *end;
 
 	_options.from_stdin = false;
 	_options.to_stdout = false;
@@ -65,7 +66,7 @@ void parse_options(int argc, char **argv)
 	_options.thumb_mode = false;
 	_options.clean_cache = false;
 
-	while ((opt = getopt(argc, argv, "bcdFfg:G:hin:N:oqrstvZz:")) != -1) {
+	while ((opt = getopt(argc, argv, "bcdFfG:g:hin:N:oqrstvZz:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
@@ -85,17 +86,18 @@ void parse_options(int argc, char **argv)
 			case 'f':
 				_options.fullscreen = true;
 				break;
-			case 'g':
-				_options.geometry = optarg;
-				break;
 			case 'G':
-				if (sscanf(optarg, "%d", &gamma) <= 0) {
+				gamma = strtol(optarg, &end, 0);
+				if (*end != '\0') {
 					fprintf(stderr, "sxiv: invalid argument for option -G: %s\n",
 					        optarg);
 					exit(EXIT_FAILURE);
 				}
 				_options.gamma = gamma;
 				break;
+			case 'g':
+				_options.geometry = optarg;
+				break;
 			case 'h':
 				print_usage();
 				exit(EXIT_SUCCESS);

sxiv.1

@@ -4,12 +4,14 @@ sxiv \- Simple X Image Viewer
 .SH SYNOPSIS
 .B sxiv
 .RB [ \-bcdFfhiopqrstvZ ]
+.RB [ \-G
+.IR GAMMA ]
 .RB [ \-g
 .IR GEOMETRY ]
-.RB [ \-n
-.IR NUM ]
 .RB [ \-N
 .IR NAME ]
+.RB [ \-n
+.IR NUM ]
 .RB [ \-z
 .IR ZOOM ]
 .IR FILE ...
@@ -44,20 +46,20 @@ size-hints to the window width/height.
 .B \-f
 Start in fullscreen mode.
 .TP
+.BI "\-G " GAMMA
+Set image gamma to GAMMA (-32..32).
+.TP
 .BI "\-g " GEOMETRY
 Set window position and size. See section GEOMETRY SPECIFICATIONS of X(7) for
 more information on
 .IR GEOMETRY .
 .TP
-.BI "\-G " GAMMA
-Set gamma to GAMMA (-32..32).
+.BI "\-N " NAME
+Set the resource name of sxiv's X window to NAME.
 .TP
 .BI "\-n " NUM
 Start at picture number NUM.
 .TP
-.BI "\-N " NAME
-Set the resource name of sxiv's X window to NAME.
-.TP
 .B \-h
 Print brief usage information to standard output and exit.
 .TP