Render background

1 files changed, 82 insertions, 0 deletions

diff --git a/src/colour.c b/src/colour.c
new file mode 100644
index 0000000..8095d69
--- /dev/null
+++ b/src/colour.c
@@ -0,0 +1,82 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<stdint.h>
+#include<stdbool.h>
+#include<string.h>
+#include<cairo/cairo.h>
+
+#include"misc.h"
+#include"colour.h"
+
+static bool colour_from_hex_string (struct Wlclock_colour *colour, const char *hex)
+{
+	unsigned int r = 0, g = 0, b = 0, a = 255;
+	if ( 4 != sscanf(hex, "#%02x%02x%02x%02x", &r, &g, &b, &a)
+			&& 3 != sscanf(hex, "#%02x%02x%02x", &r, &g, &b)
+			&& 4 != sscanf(hex, "0x%02x%02x%02x%02x", &r, &g, &b, &a)
+			&& 3 != sscanf(hex, "0x%02x%02x%02x", &r, &g, &b) )
+		return false;
+
+	colour->r = (float)r / 255.0f;
+	colour->g = (float)g / 255.0f;
+	colour->b = (float)b / 255.0f;
+	colour->a = (float)a / 255.0f;
+
+	return true;
+}
+
+static bool colour_from_rgb_string (struct Wlclock_colour *colour, const char *str)
+{
+	int32_t r = 0, g = 0, b = 0, a = 255;
+	if ( 4 != sscanf(str, "rgba(%d,%d,%d,%d)", &r, &g, &b, &a)
+			&& 3 != sscanf(str, "rgb(%d,%d,%d)", &r, &g, &b) )
+		return false;
+
+	if ( r > 255 || g > 255 || b > 255 || a > 255 )
+		return false;
+	if ( r < 0 || g < 0 || b < 0 || a < 0 )
+		return false;
+
+	colour->r = (float)r / 255.0f;
+	colour->g = (float)g / 255.0f;
+	colour->b = (float)b / 255.0f;
+	colour->a = (float)a / 255.0f;
+
+	return true;
+}
+
+bool colour_from_string (struct Wlclock_colour *colour, const char *str)
+{
+	if ( colour == NULL || str == NULL || *str == '\0' )
+		goto error;
+
+	if ( *str == '#' || strstr(str, "0x") == str )
+	{
+		if (! colour_from_hex_string(colour, str))
+			goto error;
+	}
+	else if ( strstr(str, "rgb") == str )
+	{
+		if (! colour_from_rgb_string(colour, str))
+			goto error;
+	}
+	else
+		goto error;
+
+	return true;
+
+error:
+	clocklog(NULL, 0, "ERROR: \"%s\" is not a valid colour.\n");
+	return false;
+}
+
+void colour_set_cairo_source (cairo_t *cairo, struct Wlclock_colour *colour)
+{
+	cairo_set_source_rgba(cairo, colour->r, colour->g, colour->b, colour->a);
+}
+
+bool colour_is_transparent (struct Wlclock_colour *colour)
+{
+	return colour->a == 0.0;
+}
+