Use the old and faster 1.5x scaler when available

svn-id: r27455

3 files changed, 47 insertions, 4 deletions

diff --git a/backends/platform/PalmOS/Src/be_os5.h b/backends/platform/PalmOS/Src/be_os5.h
index fc5f9e667f..13e8b4ff20 100644
--- a/backends/platform/PalmOS/Src/be_os5.h
+++ b/backends/platform/PalmOS/Src/be_os5.h
@@ -131,8 +131,7 @@ private:
 	void calc_scale();
 
 	void render_landscapeAny(RectangleType &r, PointType &p);
-	void render_landscape(RectangleType &r, PointType &p);
-	void render_portrait(RectangleType &r, PointType &p);
+	void render_landscape15x(RectangleType &r, PointType &p);
 	void render_1x(RectangleType &r, PointType &p);
 	WinHandle alloc_screen(Coord w, Coord h);
 	virtual void draw_osd(UInt16 id, Int32 x, Int32 y, Boolean show, UInt8 color = 0);
diff --git a/backends/platform/PalmOS/Src/os5_gfx.cpp b/backends/platform/PalmOS/Src/os5_gfx.cpp
index 247acf6f46..cff9e79abe 100644
--- a/backends/platform/PalmOS/Src/os5_gfx.cpp
+++ b/backends/platform/PalmOS/Src/os5_gfx.cpp
@@ -137,9 +137,13 @@ void OSystem_PalmOS5::hotswap_gfx_mode(int mode) {
 	}
 
 	if (_stretched) {
-		calc_scale();
 		OPTIONS_SET(kOptDisableOnScrDisp);
-		_render = &OSystem_PalmOS5::render_landscapeAny;
+		if (_screenHeight == 200 && _screenDest.h == 300) {
+			_render = &OSystem_PalmOS5::render_landscape15x;
+		} else {
+			_render = &OSystem_PalmOS5::render_landscapeAny;
+			calc_scale();
+		}
 	} else {
 		OPTIONS_RST(kOptDisableOnScrDisp);
 		_render = &OSystem_PalmOS5::render_1x;
diff --git a/backends/platform/PalmOS/Src/os5_renderer.cpp b/backends/platform/PalmOS/Src/os5_renderer.cpp
index fdae35acd5..4580db4d53 100644
--- a/backends/platform/PalmOS/Src/os5_renderer.cpp
+++ b/backends/platform/PalmOS/Src/os5_renderer.cpp
@@ -76,3 +76,43 @@ void OSystem_PalmOS5::render_landscapeAny(RectangleType &r, PointType &p) {
 	p.y = _screenOffset.y + o;
 	RctSetRectangle(&r, 0, 0,  _screenDest.w,  _screenDest.h - o);
 }
+
+void OSystem_PalmOS5::render_landscape15x(RectangleType &r, PointType &p) {
+	Coord x, y, o = 0;
+   	int16 *dst =  _workScreenP;
+
+	if (_overlayVisible) {
+   		int16 *src = _overlayP;
+
+		for (y = 0; y < 100; y++) {
+			// draw 2 lines
+			for (x = 0; x < 320; x++) {
+				*dst++ = *src++;
+				*dst++ = *src;
+				*dst++ = *src++;
+			}
+			// copy the second to the next line
+			MemMove(dst, dst - 480, 480 * 2);
+			dst += 480;
+		}
+	} else {
+		byte *src = _offScreenP;
+		o = _current_shake_pos;
+
+		for (y = 0; y < 100; y++) {
+			// draw 2 lines
+			for (x = 0; x < 320; x++) {
+				*dst++ = _nativePal[*src++];
+				*dst++ = _nativePal[*src];
+				*dst++ = _nativePal[*src++];
+			}
+			// copy the second to the next line
+			MemMove(dst, dst - 480, 480 * 2);
+			dst += 480;
+		}
+	}
+
+	p.x = _screenOffset.x;
+	p.y = _screenOffset.y + o;
+	RctSetRectangle(&r, 0, 0, 480, 300 - o);
+}