Add appearance customization options

include/slurp.h

@@ -24,6 +24,14 @@ struct slurp_state {
 	struct wl_list outputs; // slurp_output::link
 	struct wl_list pointers; // slurp_pointer::link
 
+	struct {
+		uint32_t background;
+		uint32_t border;
+		uint32_t selection;
+	} colors;
+
+	uint32_t border_weight;
+
 	struct slurp_box result;
 };
 

main.c

@@ -1,4 +1,5 @@
 #define _POSIX_C_SOURCE 2
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -320,21 +321,71 @@ static const struct wl_registry_listener registry_listener = {
 static const char usage[] =
 	"Usage: slurp [options...]\n"
 	"\n"
-	"  -h      Show help message and quit.\n";
+	"  -h         Show help message and quit.\n"
+	"  -b #rrggbb Set background color.\n"
+	"  -c #rrggbb Set border color.\n"
+	"  -s #rrggbb Set selection color.\n"
+	"  -w n       Set border weight.\n";
+
+uint32_t parse_color(const char *color) {
+	if (color[0] == '#') {
+		++color;
+	}
+
+	int len = strlen(color);
+	if (len != 6 && len != 8) {
+		fprintf(stderr, "Invalid color %s, "
+				"defaulting to color 0xFFFFFFFF\n", color);
+		return 0xFFFFFFFF;
+	}
+	uint32_t res = (uint32_t)strtoul(color, NULL, 16);
+	if (strlen(color) == 6) {
+		res = (res << 8) | 0xFF;
+	}
+	return res;
+}
 
 int main(int argc, char *argv[]) {
+	struct slurp_state state = {
+		.colors = {
+			.background = 0xFFFFFF40,
+			.border = 0x000000FF,
+			.selection = 0x00000000,
+		},
+		.border_weight = 2,
+	};
+
 	int opt;
-	while ((opt = getopt(argc, argv, "h")) != -1) {
+	while ((opt = getopt(argc, argv, "hb:c:s:w:")) != -1) {
 		switch (opt) {
 		case 'h':
 			printf("%s", usage);
 			return EXIT_SUCCESS;
+		case 'b':
+			state.colors.background = parse_color(optarg);
+			break;
+		case 'c':
+			state.colors.border = parse_color(optarg);
+			break;
+		case 's':
+			state.colors.selection = parse_color(optarg);
+			break;
+		case 'w': {
+			errno = 0;
+			char *endptr;
+			state.border_weight = strtol(optarg, &endptr, 10);
+			if (*endptr || errno) {
+				fprintf(stderr, "Error: expected numeric argument for -w\n");
+				exit(EXIT_FAILURE);
+			}
+			break;
+		}
 		default:
+			printf("%s", usage);
 			return EXIT_FAILURE;
 		}
 	}
 
-	struct slurp_state state = {0};
 	wl_list_init(&state.outputs);
 	wl_list_init(&state.pointers);
 

render.c

@@ -20,15 +20,10 @@ void render(struct slurp_output *output) {
 	cairo_t *cairo = buffer->cairo;
 	int32_t scale = output->scale;
 
-	uint32_t border_color = 0x000000FF;
-	int border_size = 2;
-
 	// Clear
-	cairo_save(cairo);
-	cairo_set_source_rgba(cairo, 0, 0, 0, 0);
 	cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
+	set_source_u32(cairo, state->colors.background);
 	cairo_paint(cairo);
-	cairo_restore(cairo);
 
 	struct slurp_pointer *pointer;
 	wl_list_for_each(pointer, &state->pointers, link) {
@@ -41,8 +36,13 @@ void render(struct slurp_output *output) {
 		pointer_get_box(pointer, &x, &y, &width, &height);
 
 		// Draw border
-		set_source_u32(cairo, border_color);
-		cairo_set_line_width(cairo, border_size * scale);
+		set_source_u32(cairo, state->colors.selection);
+		cairo_rectangle(cairo, x * scale, y * scale,
+			width * scale, height * scale);
+		cairo_fill(cairo);
+
+		set_source_u32(cairo, state->colors.border);
+		cairo_set_line_width(cairo, state->border_weight * scale);
 		cairo_rectangle(cairo, x * scale, y * scale,
 			width * scale, height * scale);
 		cairo_stroke(cairo);

slurp.1.scd

@@ -11,14 +11,30 @@ slurp - select a region in a Wayland compositor
 # SYNOPSIS
 
 slurp is a command-line utility to select a region from Wayland compositors
-which support the layer-shell protocol. It lets the user hold his pointer to
+which support the layer-shell protocol. It lets the user hold the pointer to
 select, or click to cancel the selection.
 
 # OPTIONS
 
 *-h*
 	Show help message and quit.
 
+*-b* _color_
+	Set background color. See *COLORS* for more detail.
+
+*-c* _color_
+	Set border color. See *COLORS* for more detail.
+
+*-s* _color_
+	Set selection color. See *COLORS* for more detail.
+
+*-w* _weight_
+	Set border weight.
+
+# COLORS
+
+Colors may be specified in #RRGGBB or #RRGGBBAA format. The # is optional.
+
 # AUTHORS
 
 Maintained by Simon Ser <[email protected]>, who is assisted by other