Implemented the OSystem framebuffer API, as discussed on scummvm-devel. All changes are just fine, and won't cause any compile problems or regressions, despite the fact that I can't test most of the non-SDL backend changes, at an improbability level of two to the power of two hundred and seventy-six thousand to one against - possibly much higher. Anything you still can't cope with is therefore your own problem. Please relax.

svn-id: r27548

2 files changed, 15 insertions, 7 deletions

diff --git a/backends/platform/PalmOS/Src/be_os5.h b/backends/platform/PalmOS/Src/be_os5.h
index 13e8b4ff20..bb38c51ca6 100644
--- a/backends/platform/PalmOS/Src/be_os5.h
+++ b/backends/platform/PalmOS/Src/be_os5.h
@@ -110,6 +110,8 @@ private:
 	typedef void (OSystem_PalmOS5::*RendererProc)(RectangleType &r, PointType &p);
 	RendererProc _render;
 
+	Graphics::Surface _framebuffer;
+
 	OverlayColor *_overlayP;
 	WinHandle _overlayH, _workScreenH;
 	int16 *_workScreenP;
@@ -168,7 +170,8 @@ public:
 
 	void copyRectToScreen(const byte *buf, int pitch, int x, int y, int w, int h);
 	void clearScreen();
-	bool grabRawScreen(Graphics::Surface *surf);
+	virtual Graphics::Surface *lockScreen();
+	virtual void unlockScreen();
 
 	void setCursorPalette(const byte *colors, uint start, uint num);
 	void disableCursorPalette(bool disable);
diff --git a/backends/platform/PalmOS/Src/os5_gfx.cpp b/backends/platform/PalmOS/Src/os5_gfx.cpp
index cff9e79abe..be5d28bc56 100644
--- a/backends/platform/PalmOS/Src/os5_gfx.cpp
+++ b/backends/platform/PalmOS/Src/os5_gfx.cpp
@@ -219,13 +219,18 @@ void OSystem_PalmOS5::copyRectToScreen(const byte *buf, int pitch, int x, int y,
 	}
 }
 
-bool OSystem_PalmOS5::grabRawScreen(Graphics::Surface *surf) {
-	assert(surf);
+Graphics::Surface *OSystem_PalmOS5::lockScreen() {
+	_framebuffer.pixels = _offScreenP;
+	_framebuffer.w = _screenWidth;
+	_framebuffer.h = _screenHeight;
+	_framebuffer.pitch = _screenWidth;
+	_framebuffer.bytesPerPixel = 1;
+
+	return &_framebuffer;
+}
 
-	surf->create(_screenWidth, _screenHeight, 1);
-	MemMove(surf->pixels, _offScreenP, _screenWidth * _screenHeight);
-	
-	return true;
+void OSystem_PalmOS5::unlockScreen() {
+	// The screen is always completely update anyway, so we don't have to force a full update here.
 }
 
 void OSystem_PalmOS5::int_updateScreen() {