Refactor and test color

Signed-off-by: pacien <pacien.trangirard@pacien.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/painter/color.c b/src/painter/color.c
new file mode 100644
index 0000000..65c4f20
--- /dev/null
+++ b/src/painter/color.c
@@ -0,0 +1,20 @@
+#include "painter/color.h"
+#include <math.h>
+
+static inline ColorComponent blend_component(ColorComponent origin, ColorComponent target, TimeVector frame) {
+  return (ColorComponent) round(sqrt((TIME_UNIT - frame) * pow(origin, 2) + frame * pow(target, 2)));
+}
+
+bool color_equals(Color c1, Color c2) {
+  return c1.rgba.r == c2.rgba.r &&
+         c1.rgba.g == c2.rgba.g &&
+         c1.rgba.b == c2.rgba.b &&
+         c1.rgba.a == c2.rgba.a;
+}
+
+Color color_blend(Color origin, Color target, TimeVector distance) {
+  return (Color) {{blend_component(origin.rgba.a, target.rgba.a, distance),
+                   blend_component(origin.rgba.b, target.rgba.b, distance),
+                   blend_component(origin.rgba.g, target.rgba.g, distance),
+                   blend_component(origin.rgba.r, target.rgba.r, distance)}};
+}