[PATCH v4 0/1] MR3931: windows.ui: Support accent colors in uisettings3_GetColorValue.

[Myah Caron (＠qsniyg)]

Fixes https://bugs.winehq.org/show_bug.cgi?id=55640.

The lightening/darkening values are loosely based on Qt 6's fallback code: https://github.com/qt/qtbase/blob/ba98644180bcaf40341a9005abe93575cf45cc5a/s....

The values are not perfect, technically it should use Software\Microsoft\Windows\DWM\AccentColor. But since to my knowledge, wine doesn't use AccentColor in any way, this should do the trick for now. `COLOR_HIGHLIGHT` should be roughly the same color as the accent color in most cases. Qt 6 uses the accent color as its highlight color anyways.

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  v4: windows.ui: Support accent colors in uisettings3_GetColorValue.

https://gitlab.winehq.org/wine/wine/-/merge_requests/3931

[PATCH v4 1/1] windows.ui: Support accent colors in uisettings3_GetColorValue.

[Myah Caron]

From: Myah Caron

Signed-off-by: Myah Caron 
---
 dlls/windows.ui/Makefile.in  |  2 +-
 dlls/windows.ui/uisettings.c | 41 +++++++++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/dlls/windows.ui/Makefile.in b/dlls/windows.ui/Makefile.in
index 592d023f353..4fafcbfe869 100644
--- a/dlls/windows.ui/Makefile.in
+++ b/dlls/windows.ui/Makefile.in
@@ -1,5 +1,5 @@
 MODULE  = windows.ui.dll
-IMPORTS = combase advapi32
+IMPORTS = combase advapi32 user32

C_SRCS = \
    main.c \
diff --git a/dlls/windows.ui/uisettings.c b/dlls/windows.ui/uisettings.c
index 041388da33b..76e0ba6b28b 100644
--- a/dlls/windows.ui/uisettings.c
+++ b/dlls/windows.ui/uisettings.c
@@ -274,9 +274,23 @@ static void set_color_value( BYTE a, BYTE r, BYTE g, BYTE b, Color *out )
     out->B = b;
 }

+static BYTE darken_single_color( BYTE color, float darken )
+{
+    return (BYTE)(color + ((color / 256.0) * darken));
+}
+
+static void darken_dword_to_color( DWORD color, float darken, Color *out )
+{
+    out->R = darken_single_color(color & 0xFF, darken);
+    out->G = darken_single_color((color >> 8) & 0xFF, darken);
+    out->B = darken_single_color((color >> 16) & 0xFF, darken);
+    out->A = (color >> 24) & 0xFF;
+}
+
 static HRESULT WINAPI uisettings3_GetColorValue( IUISettings3 *iface, UIColorType type, Color *value )
 {
     DWORD theme;
+    DWORD highlight;

TRACE( "iface %p, type %d, value %p.\n", iface, type, value );

@@ -286,6 +300,17 @@ static HRESULT WINAPI uisettings3_GetColorValue( IUISettings3 *iface, UIColorTyp
     case UIColorType_Background:
         theme = get_app_theme();
         break;
+    case UIColorType_Accent:
+    case UIColorType_AccentDark1:
+    case UIColorType_AccentDark2:
+    case UIColorType_AccentDark3:
+    case UIColorType_AccentLight1:
+    case UIColorType_AccentLight2:
+    case UIColorType_AccentLight3:
+        if (type != UIColorType_Accent)
+            FIXME( "type %d: returning dummy color.\n", type );
+        highlight = GetSysColor(COLOR_HIGHLIGHT);
+        break;
     default:
         FIXME( "type %d not implemented.\n", type );
         return E_NOTIMPL;
@@ -293,8 +318,22 @@ static HRESULT WINAPI uisettings3_GetColorValue( IUISettings3 *iface, UIColorTyp

if (type == UIColorType_Foreground)
         set_color_value( 255, theme ? 0 : 255, theme ? 0 : 255, theme ? 0 : 255, value );
-    else
+    else if (type == UIColorType_Background)
         set_color_value( 255, theme ? 255 : 0, theme ? 255 : 0, theme ? 255 : 0, value );
+    else if (type == UIColorType_Accent)
+        darken_dword_to_color( highlight, 0.0, value );
+    else if (type == UIColorType_AccentDark1)
+        darken_dword_to_color( highlight, 0.2, value );
+    else if (type == UIColorType_AccentDark2)
+        darken_dword_to_color( highlight, 0.4, value );
+    else if (type == UIColorType_AccentDark3)
+        darken_dword_to_color( highlight, 0.6, value );
+    else if (type == UIColorType_AccentLight1)
+        darken_dword_to_color( highlight, -0.2, value );
+    else if (type == UIColorType_AccentLight2)
+        darken_dword_to_color( highlight, -0.4, value );
+    else if (type == UIColorType_AccentLight3)
+        darken_dword_to_color( highlight, -0.6, value );

TRACE( "Returning value.A = %d, value.R = %d, value.G = %d, value.B = %d\n", value->A, value->R, value->G, value->B );
     return S_OK;