libui: add API for setting a background color for uiArea. (TODO: do for GTK)

make window background black.

3 files changed, 33 insertions, 8 deletions

diff --git a/src/libui_sdl/libui/windows/area.cpp b/src/libui_sdl/libui/windows/area.cpp
index 6bb8fe7..2185f25 100644
--- a/src/libui_sdl/libui/windows/area.cpp
+++ b/src/libui_sdl/libui/windows/area.cpp
@@ -167,6 +167,15 @@ void uiAreaBeginUserWindowResize(uiArea *a, uiWindowResizeEdge edge)
 		wParam, 0);
 }
 
+
+void uiAreaSetBackgroundColor(uiArea *a, int r, int g, int b)
+{
+    a->bgR = r;
+    a->bgG = g;
+    a->bgB = b;
+}
+
+
 uiArea *uiNewArea(uiAreaHandler *ah)
 {
 	uiArea *a;
@@ -184,6 +193,8 @@ uiArea *uiNewArea(uiAreaHandler *ah)
 		hInstance, a,
 		FALSE);
 
+    uiAreaSetBackgroundColor(a, -1, -1, -1);
+
 	return a;
 }
 
@@ -206,6 +217,8 @@ uiArea *uiNewScrollingArea(uiAreaHandler *ah, int width, int height)
 		hInstance, a,
 		FALSE);
 
+    uiAreaSetBackgroundColor(a, -1, -1, -1);
+
 	// set initial scrolling parameters
 	areaUpdateScroll(a);
 
diff --git a/src/libui_sdl/libui/windows/area.hpp b/src/libui_sdl/libui/windows/area.hpp
index 86a62de..add62dd 100644
--- a/src/libui_sdl/libui/windows/area.hpp
+++ b/src/libui_sdl/libui/windows/area.hpp
@@ -24,6 +24,8 @@ struct uiArea {
 	BOOL inside;
 	BOOL tracking;
 
+	int bgR, bgG, bgB;
+
 	ID2D1HwndRenderTarget *rt;
 };
 
diff --git a/src/libui_sdl/libui/windows/areadraw.cpp b/src/libui_sdl/libui/windows/areadraw.cpp
index 7b3dc69..0bdf58a 100644
--- a/src/libui_sdl/libui/windows/areadraw.cpp
+++ b/src/libui_sdl/libui/windows/areadraw.cpp
@@ -40,14 +40,24 @@ static HRESULT doPaint(uiArea *a, ID2D1RenderTarget *rt, RECT *clip)
 
 	// TODO only clear the clip area
 	// TODO clear with actual background brush
-	bgcolorref = GetSysColor(COLOR_BTNFACE);
-	bgcolor.r = ((float) GetRValue(bgcolorref)) / 255.0;
-	// due to utter apathy on Microsoft's part, GetGValue() does not work with MSVC's Run-Time Error Checks
-	// it has not worked since 2008 and they have *never* fixed it
-	// TODO now that -RTCc has just been deprecated entirely, should we switch back?
-	bgcolor.g = ((float) ((BYTE) ((bgcolorref & 0xFF00) >> 8))) / 255.0;
-	bgcolor.b = ((float) GetBValue(bgcolorref)) / 255.0;
-	bgcolor.a = 1.0;
+	if (a->bgR != -1)
+    {
+        bgcolor.r = ((float) a->bgR) / 255.0;
+        bgcolor.g = ((float) a->bgG) / 255.0;
+        bgcolor.b = ((float) a->bgB) / 255.0;
+        bgcolor.a = 1.0;
+    }
+    else
+    {
+        bgcolorref = GetSysColor(COLOR_BTNFACE);
+        bgcolor.r = ((float) GetRValue(bgcolorref)) / 255.0;
+        // due to utter apathy on Microsoft's part, GetGValue() does not work with MSVC's Run-Time Error Checks
+        // it has not worked since 2008 and they have *never* fixed it
+        // TODO now that -RTCc has just been deprecated entirely, should we switch back?
+        bgcolor.g = ((float) ((BYTE) ((bgcolorref & 0xFF00) >> 8))) / 255.0;
+        bgcolor.b = ((float) GetBValue(bgcolorref)) / 255.0;
+        bgcolor.a = 1.0;
+    }
 	rt->Clear(&bgcolor);
 
 	(*(ah->Draw))(ah, a, &dp);