New file : Osystem overlay function only, overlay now only on storage memory

svn-id: r13879

1 files changed, 126 insertions, 0 deletions

diff --git a/backends/PalmOS/Src/palmovl.cpp b/backends/PalmOS/Src/palmovl.cpp
new file mode 100644
index 0000000000..181c0498a0
--- /dev/null
+++ b/backends/PalmOS/Src/palmovl.cpp
@@ -0,0 +1,126 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ * Copyright (C) 2001-2004 The ScummVM project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+#include "stdafx.h"
+#include "palm.h"
+
+void OSystem_PALMOS::showOverlay() {
+	// hide the mouse
+	undraw_mouse();
+	// save background
+	byte *src = _offScreenP;
+	byte *dst = _tmpBackupP;
+	int h = _screenHeight;
+
+	UInt32 offset = 0;
+	do {
+		DmWrite(dst, offset, src, _screenWidth);
+		offset += _screenWidth;
+		src += _offScreenPitch;
+	} while (--h);	
+
+	_overlayVisible = true;
+	clearOverlay();
+}
+
+void OSystem_PALMOS::hideOverlay() {
+	// hide the mouse
+	undraw_mouse();
+
+	_overlayVisible = false;
+	copyRectToScreen(_tmpBackupP, _screenWidth, 0, 0, _screenWidth, _screenHeight);
+}
+
+void OSystem_PALMOS::clearOverlay() {
+	if (!_overlayVisible)
+		return;
+
+	// hide the mouse
+	undraw_mouse();
+	// restore background
+	DmWrite(_tmpScreenP, 0, _tmpBackupP, _screenWidth * _screenHeight);
+}
+
+void OSystem_PALMOS::grabOverlay(byte *buf, int pitch) {
+	if (!_overlayVisible)
+		return;
+
+	// hide the mouse
+	undraw_mouse();
+
+	byte *src = _tmpScreenP;
+	int h = _screenHeight;
+
+	do {
+		memcpy(buf, src, _screenWidth);
+		src += _screenWidth;
+		buf += pitch;
+	} while (--h);
+}
+
+void OSystem_PALMOS::copyRectToOverlay(const byte *buf, int pitch, int x, int y, int w, int h) {
+	if (!_overlayVisible)
+		return;
+
+	if (!_tmpScreenP)
+		return;
+
+	// Clip the coordinates
+	if (x < 0) {
+		w += x;
+		buf -= x;
+		x = 0;
+	}
+
+	if (y < 0) {
+		h += y; buf -= y * pitch;
+		y = 0;
+	}
+
+	if (w > _screenWidth - x)
+		w = _screenWidth - x;
+
+	if (h > _screenHeight - y)
+		h = _screenHeight - y;
+
+	if (w <= 0 || h <= 0)
+		return;
+
+	/* FIXME: undraw mouse only if the draw rect intersects with the mouse rect */
+	if (_mouseDrawn) {
+/*		RectangleType mouse = {_mouseCurState.x, _mouseCurState.y, _mouseCurState.w, _mouseCurState.h};
+		RectangleType copy	= {x, y, w, h};
+		RectangleType result;
+		
+		RctGetIntersection(&mouse, &copy, &result);
+		
+		if (result.extent.x !=0 && result.extent.y !=0)*/
+			undraw_mouse();
+	}
+
+	byte *dst = _tmpScreenP;
+	int offset = y * _screenWidth + x;
+	do {
+		DmWrite(dst, offset, buf, w);
+		offset += _screenWidth;
+		buf += pitch;
+	} while (--h);
+}