IPHONE: Add aspect ratio correction to iPhone

3 files changed, 32 insertions, 3 deletions

diff --git a/backends/platform/iphone/iphone_common.h b/backends/platform/iphone/iphone_common.h
index 18821e697f..d4c4cf3eb2 100644
--- a/backends/platform/iphone/iphone_common.h
+++ b/backends/platform/iphone/iphone_common.h
@@ -75,6 +75,8 @@ struct VideoContext {
 };
 
 // On the ObjC side
+void iPhone_setAspectRatioState(bool enable); 
+bool iPhone_getAspectRatioState();
 void iPhone_updateScreen();
 void iPhone_updateScreenRect(unsigned short *screen, int x1, int y1, int x2, int y2, int width);
 void iPhone_updateOverlayRect(unsigned short *screen, int x1, int y1, int x2, int y2, int width);
diff --git a/backends/platform/iphone/iphone_video.mm b/backends/platform/iphone/iphone_video.mm
index 387ed7252f..56c74b9ac5 100644
--- a/backends/platform/iphone/iphone_video.mm
+++ b/backends/platform/iphone/iphone_video.mm
@@ -53,6 +53,8 @@ static long lastTick = 0;
 static int frames = 0;
 #endif
 
+static bool _aspectRatioCorrect = false;
+
 #define printOpenGLError() printOglError(__FILE__, __LINE__)
 
 int printOglError(const char *file, int line) {
@@ -73,6 +75,14 @@ void iPhone_setMouseCursor(unsigned short *buffer) {
 	[g_iPhoneViewInstance performSelectorOnMainThread:@selector(updateMouseCursor) withObject:nil waitUntilDone: YES];
 }
 
+void iPhone_setAspectRatioState(bool enable) {
+	_aspectRatioCorrect = enable;
+}
+
+bool iPhone_getAspectRatioState() {
+	return _aspectRatioCorrect;
+}
+
 bool iPhone_isHighResDevice() {
 	return _fullHeight > 480;
 }
@@ -485,7 +495,7 @@ const char *iPhone_getDocumentsDir() {
 
 	int screenWidth, screenHeight;
 	[self setUpOrientation:[[UIDevice currentDevice] orientation] width:&screenWidth height:&screenHeight];
-
+	
 	//printf("Window: (%d, %d), Surface: (%d, %d), Texture(%d, %d)\n", _fullWidth, _fullHeight, _videoContext.screenWidth, _videoContext.screenHeight, _gameScreenTextureWidth, _gameScreenTextureHeight);
 
 	if (_screenTexture > 0) {
@@ -516,10 +526,22 @@ const char *iPhone_getDocumentsDir() {
 		[[_keyboardView inputView] removeFromSuperview];
 	}
 
+	float adjustedWidth = _videoContext.screenWidth;
+	float adjustedHeight = _videoContext.screenHeight;
+    if (_aspectRatioCorrect && ((_videoContext.screenWidth == 320 && _videoContext.screenHeight == 200)
+		|| (_videoContext.screenWidth == 640 && _videoContext.screenHeight == 400)) )  {
+		if (_videoContext.screenHeight == 200) {
+			adjustedHeight = 240;
+		}
+		if (_videoContext.screenHeight == 400) {
+			adjustedHeight = 480;
+		}
+	}
+	
 	float overlayPortraitRatio;
 
 	if (_orientation == UIDeviceOrientationLandscapeLeft || _orientation ==  UIDeviceOrientationLandscapeRight) {
-		GLfloat gameScreenRatio = (GLfloat)_videoContext.screenWidth / (GLfloat)_videoContext.screenHeight;
+		GLfloat gameScreenRatio = (GLfloat)adjustedWidth / (GLfloat)adjustedHeight;
 		GLfloat screenRatio = (GLfloat)screenWidth / (GLfloat)screenHeight;
 
 		// These are the width/height according to the portrait layout!
@@ -548,7 +570,7 @@ const char *iPhone_getDocumentsDir() {
 		_gameScreenRect = CGRectMake(xOffset, yOffset, rectWidth, rectHeight);
 		overlayPortraitRatio = 1.0f;
 	} else {
-		float ratio = (float)_videoContext.screenHeight / (float)_videoContext.screenWidth;
+		float ratio = (float)adjustedHeight / (float)adjustedWidth;
 		int height = (int)(screenWidth * ratio);
 		//printf("Making rect (%u, %u)\n", screenWidth, height);
 		_gameScreenRect = CGRectMake(0, 0, screenWidth, height);
diff --git a/backends/platform/iphone/osys_main.cpp b/backends/platform/iphone/osys_main.cpp
index 368434c476..3c9d2d949c 100644
--- a/backends/platform/iphone/osys_main.cpp
+++ b/backends/platform/iphone/osys_main.cpp
@@ -119,6 +119,9 @@ void OSystem_IPHONE::setFeatureState(Feature f, bool enable) {
 			_mouseCursorPaletteEnabled = enable;
 		}
 		break;
+	case kFeatureAspectRatioCorrection:
+		iPhone_setAspectRatioState(enable);
+		break;
 
 	default:
 		break;
@@ -129,6 +132,8 @@ bool OSystem_IPHONE::getFeatureState(Feature f) {
 	switch (f) {
 	case kFeatureCursorPalette:
 		return _mouseCursorPaletteEnabled;
+	case kFeatureAspectRatioCorrection:
+		return iPhone_getAspectRatioState();
 
 	default:
 		return false;