From 657ff50ca9f29ed8bfb39b6bf09475f9d59085f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <superstippi@gmx.de>
Date: Sat, 16 Jul 2005 22:54:25 +0000
Subject: [PATCH] fall back to double buffered mode was already workingif mode
 was not 32-bit, only that IsDoubleBuffered() was not implemented, so that
 HWInterface::DrawingBuffer() returned the front buffer, which had the
 non-32-bit format... so this fixes non-32 bit modes, IAW, Vesa is working now

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13703 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/servers/app/drawing/AccelerantHWInterface.cpp | 10 ++++++++++
 src/servers/app/drawing/AccelerantHWInterface.h   |  5 +++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/servers/app/drawing/AccelerantHWInterface.cpp b/src/servers/app/drawing/AccelerantHWInterface.cpp
index 735ed919b5..8c63f188c8 100644
--- a/src/servers/app/drawing/AccelerantHWInterface.cpp
+++ b/src/servers/app/drawing/AccelerantHWInterface.cpp
@@ -791,6 +791,16 @@ AccelerantHWInterface::BackBuffer() const
 	return fBackBuffer;
 }
 
+// IsDoubleBuffered
+bool
+AccelerantHWInterface::IsDoubleBuffered() const
+{
+	if (fModeList)
+		return fBackBuffer != NULL;
+
+	return HWInterface::IsDoubleBuffered();
+}
+
 // _DrawCursor
 void
 AccelerantHWInterface::_DrawCursor(BRect area) const
diff --git a/src/servers/app/drawing/AccelerantHWInterface.h b/src/servers/app/drawing/AccelerantHWInterface.h
index 645fc30a2d..6448eb4475 100644
--- a/src/servers/app/drawing/AccelerantHWInterface.h
+++ b/src/servers/app/drawing/AccelerantHWInterface.h
@@ -66,8 +66,9 @@ virtual	void					MoveCursorTo(const float& x,
 											 const float& y);
 
 	// frame buffer access
-virtual	RenderingBuffer			*FrontBuffer() const;
-virtual	RenderingBuffer			*BackBuffer() const;
+virtual	RenderingBuffer*		FrontBuffer() const;
+virtual	RenderingBuffer*		BackBuffer() const;
+virtual	bool					IsDoubleBuffered() const;
 
 protected:
 virtual	void					_DrawCursor(BRect area) const;