Color UI

launcher/CMakeLists.txt

@@ -14,6 +14,7 @@ add_executable(launcher
     src/options/parser.cpp
     src/main.cpp
     src/ui/frame.cpp
+    src/ui/color.cpp
     src/client/configuration.cpp
     src/client/cache.cpp
     src/client/ui.cpp

launcher/src/ui/color.cpp

@@ -0,0 +1,35 @@
+#include "frame.h"
+
+// Clamp Function
+static float clamp(const float value, const float min = 0.0f, const float max = 1.0f) {
+    return std::max(min, std::min(value, max));
+}
+
+// Calculate Perceived Brightness Of Color
+// See: https://en.wikipedia.org/w/index.php?title=Relative_luminance&useskin=vector
+static float compute_luma(const ImVec4 &color) {
+    return (0.2126f * color.x) + (0.7152f * color.y) + (0.0722f * color.z);
+}
+
+// Apply Luma To RGB
+static ImVec4 apply_luma_to_color(const float target_luma, const ImVec4 &color) {
+    const float current_luma = compute_luma(color);
+    const float luma_ratio = (current_luma != 0) ? target_luma / current_luma : 0;
+    ImVec4 out = color;
+    for (float *x : {&out.x, &out.y, &out.z}) {
+        *x = clamp(*x * luma_ratio);
+    }
+    return out;
+}
+
+// Blend Color
+static ImVec4 blend_color(const ImVec4 &top, const ImVec4 &bottom) {
+    const float luma = compute_luma(bottom);
+    ImVec4 out = apply_luma_to_color(luma, top);
+    out.w = bottom.w;
+    return out;
+}
+ImVec4 Frame::blend_with_primary(const ImVec4 &color) {
+    static constexpr ImVec4 primary_color = {1.0f, (69.0f / 255.0f), 0.0f, 1.0f};
+    return blend_color(primary_color, color);
+}

launcher/src/ui/frame.cpp

@@ -86,4 +86,39 @@ void Frame::setup_style(const float scale) {
     style.WindowBorderSize = 0;
     ImGui::StyleColorsDark(&style);
     style.ScaleAllSizes(scale);
+    // Colors
+    static int target_colors[] = {
+        ImGuiCol_FrameBg,
+        ImGuiCol_FrameBgHovered,
+        ImGuiCol_FrameBgActive,
+        ImGuiCol_TitleBgActive,
+        ImGuiCol_CheckMark,
+        ImGuiCol_SliderGrab,
+        ImGuiCol_SliderGrabActive,
+        ImGuiCol_Button,
+        ImGuiCol_ButtonHovered,
+        ImGuiCol_ButtonActive,
+        ImGuiCol_Header,
+        ImGuiCol_HeaderHovered,
+        ImGuiCol_HeaderActive,
+        ImGuiCol_Separator,
+        ImGuiCol_SeparatorHovered,
+        ImGuiCol_SeparatorActive,
+        ImGuiCol_ResizeGrip,
+        ImGuiCol_ResizeGripHovered,
+        ImGuiCol_ResizeGripActive,
+        ImGuiCol_TabHovered,
+        ImGuiCol_Tab,
+        ImGuiCol_TabSelected,
+        ImGuiCol_TabSelectedOverline,
+        ImGuiCol_TabDimmed,
+        ImGuiCol_TabDimmedSelected,
+        ImGuiCol_TextLink,
+        ImGuiCol_TextSelectedBg,
+        ImGuiCol_NavCursor
+    };
+    for (const int target_color : target_colors) {
+        ImVec4 &color = style.Colors[target_color];
+        color = blend_with_primary(color);
+    }
 }

launcher/src/ui/frame.h

@@ -19,4 +19,5 @@ private:
     // Internal
     float get_scale();
     void setup_style(float scale);
+    static ImVec4 blend_with_primary(const ImVec4 &color);
 };