From 48f10b6e30d45cb2987a31f7efe4673b91a3e99b Mon Sep 17 00:00:00 2001
From: antifallobst <antifallobst@systemausfall.org>
Date: Wed, 22 Feb 2023 23:30:32 +0100
Subject: [PATCH] feature (kernel): Implemented a color palette and fixed an
 alpha blending overflow bug

---
 kernel/inc/drivers/graphics/color.h | 17 +++++++++++++++++
 kernel/src/drivers/graphics/color.c | 20 ++++++++++++++++----
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/kernel/inc/drivers/graphics/color.h b/kernel/inc/drivers/graphics/color.h
index fa2dc58..b112664 100644
--- a/kernel/inc/drivers/graphics/color.h
+++ b/kernel/inc/drivers/graphics/color.h
@@ -18,6 +18,21 @@
 
 #include "utils/stdtypes.h"
 
+// Colors from https://gogh-co.github.io/Gogh/
+typedef enum {
+    COLOR_PAL_GREY_DARK,
+    COLOR_PAL_PINK,
+    COLOR_PAL_GREEN_SIGNAL,
+    COLOR_PAL_ORANGE,
+    COLOR_PAL_BLUE,
+    COLOR_PAL_PURPLE,
+    COLOR_PAL_GREEN,
+    COLOR_PAL_GREY_LIGHT,
+    COLOR_PAL_RED,
+
+    COLOR_PAL_ENUM_END
+} color_palette_E;
+
 typedef struct {
     uint8_t alpha;
     uint8_t red;
@@ -25,6 +40,8 @@ typedef struct {
     uint8_t blue;
 } color_argb_T;
 
+extern color_argb_T color_palette[COLOR_PAL_ENUM_END];
+
 color_argb_T color_argb_blend_alpha(color_argb_T background, color_argb_T foreground);
 
 #endif //NOX_COLOR_H
diff --git a/kernel/src/drivers/graphics/color.c b/kernel/src/drivers/graphics/color.c
index aea3644..0ef3654 100644
--- a/kernel/src/drivers/graphics/color.c
+++ b/kernel/src/drivers/graphics/color.c
@@ -15,11 +15,23 @@
 
 #include "drivers/graphics/color.h"
 
+color_argb_T color_palette[COLOR_PAL_ENUM_END] = {
+        {0xFF, 0x36, 0x36, 0x36},   // GREY_DARK
+        {0xFF, 0xFF, 0x08, 0x83},   // PINK
+        {0xFF, 0x83, 0xff, 0x08},   // GREEN_SIGNAL
+        {0xFF, 0xFF, 0x83, 0x08},   // ORANGE
+        {0xFF, 0x08, 0x83, 0xFF},   // BLUE
+        {0xFF, 0x83, 0x08, 0xFF},   // PURPLE
+        {0xFF, 0x08, 0xFF, 0x83},   // GREEN
+        {0xFF, 0xB6, 0xB6, 0xB6},   // GREY_LIGHT
+        {0xFF, 0xFF, 0x00, 0x00},   // RED
+};
+
 color_argb_T color_argb_blend_alpha(color_argb_T background, color_argb_T foreground) {
-    color_argb_T color = foreground;
-    color.red   += ((foreground.red   * foreground.alpha) + (background.red   * (0xFF - foreground.alpha))) / 0xFF;
-    color.green += ((foreground.green * foreground.alpha) + (background.green * (0xFF - foreground.alpha))) / 0xFF;
-    color.blue  += ((foreground.blue  * foreground.alpha) + (background.blue  * (0xFF - foreground.alpha))) / 0xFF;
+    color_argb_T color;
+    color.red   = ((foreground.red   * foreground.alpha) + (background.red   * (0xFF - foreground.alpha))) / 0xFF;
+    color.green = ((foreground.green * foreground.alpha) + (background.green * (0xFF - foreground.alpha))) / 0xFF;
+    color.blue  = ((foreground.blue  * foreground.alpha) + (background.blue  * (0xFF - foreground.alpha))) / 0xFF;
 
     return color;
 }