overlay: tweak imgui colors (#359)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Change the dark brown colors used in widget backgrounds to dark gray.

Decrease the in-game overlay transparency (more opaque): 80% -> 96%.

## Testing
Tested cfg and in-game overlay.

src/spice2x/overlay/overlay.cpp

@@ -174,18 +174,18 @@ void overlay::SpiceOverlay::init() {
     // https://github.com/ocornut/imgui/issues/707#issuecomment-760220280
     // r, g, b, a
     ImVec4* colors = ImGui::GetStyle().Colors;
-    // colors[ImGuiCol_Text]                   = ImVec4(0.75f, 0.75f, 0.75f, 1.00f);
-    // colors[ImGuiCol_TextDisabled]           = ImVec4(0.35f, 0.35f, 0.35f, 1.00f);
 
-    // colors[ImGuiCol_WindowBg]               = ImVec4(0.00f, 0.00f, 0.00f, 0.94f);
+    // note: also see bg_alpha value in each overlay window
-    // colors[ImGuiCol_ChildBg]                = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+    colors[ImGuiCol_WindowBg]               = ImVec4(0.06f, 0.06f, 0.06f, 1.0f);
-    colors[ImGuiCol_PopupBg]                = ImVec4(0.08f, 0.f, 0.f, 0.94f);
+    colors[ImGuiCol_PopupBg]                = ImVec4(0.08f, 0.08f, 0.08f, 1.0f);
 
     colors[ImGuiCol_Border]                 = ImVec4(0.00f, 0.00f, 0.00f, 0.50f);
     colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
-    colors[ImGuiCol_FrameBg]                = ImVec4(0.37f, 0.14f, 0.00f, 0.54f);
+
-    colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.37f, 0.14f, 0.14f, 0.67f);
+    colors[ImGuiCol_FrameBg]                = ImVec4(0.18f, 0.18f, 0.18f, 0.54f);
-    colors[ImGuiCol_FrameBgActive]          = ImVec4(0.39f, 0.20f, 0.20f, 0.67f);
+    colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.18f, 0.18f, 0.18f, 0.80f);
+    colors[ImGuiCol_FrameBgActive]          = ImVec4(0.24f, 0.24f, 0.24f, 0.80f);
+
     colors[ImGuiCol_TitleBg]                = ImVec4(0.04f, 0.04f, 0.04f, 1.00f);
     colors[ImGuiCol_TitleBgActive]          = ImVec4(0.48f, 0.16f, 0.16f, 1.00f);
     colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.48f, 0.16f, 0.16f, 1.00f);
@@ -194,16 +194,16 @@ void overlay::SpiceOverlay::init() {
     colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.31f, 0.31f, 0.31f, 1.00f);
     colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.41f, 0.41f, 0.41f, 1.00f);
     colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.51f, 0.51f, 0.51f, 1.00f);
-    colors[ImGuiCol_CheckMark]              = ImVec4(0.56f, 0.10f, 0.10f, 1.00f);
+    colors[ImGuiCol_CheckMark]              = ImVec4(0.89f, 0.00f, 0.19f, 1.00f);
     colors[ImGuiCol_SliderGrab]             = ImVec4(1.00f, 0.19f, 0.19f, 0.40f);
     colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.89f, 0.00f, 0.19f, 1.00f);
 
     colors[ImGuiCol_Button]                 = ImVec4(1.00f, 0.19f, 0.19f, 0.40f);
     colors[ImGuiCol_ButtonHovered]          = ImVec4(0.80f, 0.17f, 0.00f, 1.00f);
-    colors[ImGuiCol_ButtonActive]           = ImVec4(0.89f, 0.00f, 0.19f, 1.00f);
+    colors[ImGuiCol_ButtonActive]           = ImVec4(0.80f, 0.17f, 0.00f, 0.90f);
 
     colors[ImGuiCol_Header]                 = ImVec4(0.33f, 0.35f, 0.36f, 0.53f);
-    colors[ImGuiCol_HeaderHovered]          = ImVec4(0.76f, 0.28f, 0.44f, 0.67f);
+    colors[ImGuiCol_HeaderHovered]          = ImVec4(0.44f, 0.44f, 0.44f, 0.67f);
     colors[ImGuiCol_HeaderActive]           = ImVec4(0.47f, 0.47f, 0.47f, 0.67f);
     colors[ImGuiCol_Separator]              = ImVec4(0.32f, 0.32f, 0.32f, 1.00f);
     colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.32f, 0.32f, 0.32f, 1.00f);
@@ -228,7 +228,7 @@ void overlay::SpiceOverlay::init() {
     colors[ImGuiCol_TableBorderStrong]      = ImVec4(0.31f, 0.31f, 0.35f, 1.00f);
     colors[ImGuiCol_TableBorderLight]       = ImVec4(0.23f, 0.23f, 0.25f, 1.00f);
     colors[ImGuiCol_TableRowBg]             = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
-    colors[ImGuiCol_TableRowBgAlt]          = ImVec4(1.00f, 1.00f, 1.00f, 0.04f);
+    colors[ImGuiCol_TableRowBgAlt]          = ImVec4(1.00f, 1.00f, 1.00f, 0.02f);
     colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
     colors[ImGuiCol_DragDropTarget]         = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
     colors[ImGuiCol_NavHighlight]           = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);

src/spice2x/overlay/window.h

@@ -45,7 +45,7 @@ namespace overlay {
         ImVec2 init_size = ImVec2(0, 0);
         ImVec2 size_min = ImVec2(0, 0);
         ImVec2 size_max = ImVec2(-1, -1);
-        float bg_alpha = 0.8f;
+        float bg_alpha = 0.96f;
 
         Window(SpiceOverlay *overlay);
     };

src/spice2x/overlay/windows/config.cpp

@@ -3024,9 +3024,13 @@ namespace overlay::windows {
             }
 
             // game selector
+            ImGui::PushStyleColor(ImGuiCol_FrameBg, ImVec4(0.34f, 0.14f, 0.14f, 0.54f));
+            ImGui::PushStyleColor(ImGuiCol_FrameBgActive, ImVec4(0.34f, 0.14f, 0.14f, 0.54f));
+            ImGui::PushStyleColor(ImGuiCol_FrameBgHovered, ImVec4(0.34f, 0.14f, 0.14f, 0.64f));
             ImGui::PushItemWidth(MIN(700, MAX(100, ImGui::GetWindowSize().x - 400)));
             ImGui::Combo("##game_selector", game_selected, games_names.data(), (int)games_list.size());
             ImGui::PopItemWidth();
+            ImGui::PopStyleColor(3);
 
             ImGui::BeginDisabled();
             if (!avs::game::is_model("000")) {

src/spice2x/overlay/windows/fps.cpp

@@ -14,7 +14,7 @@ namespace overlay::windows {
                       | ImGuiWindowFlags_NoNavFocus
                       | ImGuiWindowFlags_NoNavInputs
                       | ImGuiWindowFlags_NoDocking;
-        this->bg_alpha = 0.4f;
+        this->bg_alpha = 0.5f;
         this->start_time = std::chrono::system_clock::now();
     }