From 8014fe06fcf9386d98daa49418e3596bd2baa5a6 Mon Sep 17 00:00:00 2001
From: D G Turner
Date: Sun, 24 Nov 2019 01:41:14 +0000
Subject: LINUXMOTO: Implement horizontal shake

---
 .../linuxmotosdl/linuxmotosdl-graphics.cpp         | 30 ++++++++++++++++++----
 1 file changed, 25 insertions(+), 5 deletions(-)

(limited to 'backends')

diff --git a/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp b/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
index 4e64060992..b0837db2c6 100644
--- a/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
+++ b/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
@@ -196,6 +196,7 @@ void LinuxmotoSdlGraphicsManager::drawMouse() {
 	// scaling, shake position and aspect ratio correction manually.
 
 	if (!_overlayVisible) {
+		dst.x += _currentShakeXOffset;
 		dst.y += _currentShakeYOffset;
 	}
 
@@ -248,6 +249,19 @@ void LinuxmotoSdlGraphicsManager::internUpdateScreen() {
 #endif
 
 	// If the shake position changed, fill the dirty area with blackness
+	if (_currentShakeXOffset != _gameScreenShakeXOffset ||
+		(_cursorNeedsRedraw && _mouseBackup.x <= _currentShakeXOffset)) {
+		SDL_Rect blackrect = {0, 0, (Uint16)(_gameScreenShakeXOffset * _videoMode.scaleFactor), (Uint16)(_videoMode.screenHeight * _videoMode.scaleFactor)};
+
+		if (_videoMode.aspectRatioCorrection && !_overlayVisible)
+			blackrect.h = real2Aspect(blackrect.h - 1) + 1;
+
+		SDL_FillRect(_hwScreen, &blackrect, 0);
+
+		_currentShakeXOffset = _gameScreenShakeXOffset;
+
+		_forceFull = true;
+	}
 	if (_currentShakeYOffset != _gameScreenShakeYOffset ||
 		(_cursorNeedsRedraw && _mouseBackup.y <= _currentShakeYOffset)) {
 		SDL_Rect blackrect = {0, 0, (Uint16)(_videoMode.screenWidth * _videoMode.scaleFactor), (Uint16)(_gameScreenShakeYOffset * _videoMode.scaleFactor)};
@@ -333,13 +347,17 @@ void LinuxmotoSdlGraphicsManager::internUpdateScreen() {
 		for (r = _dirtyRectList; r != lastRect; ++r) {
 			int dst_y = r->y + _currentShakeYOffset;
 			int dst_h = 0;
-			int dst_w = r->w;
+			int dst_w = 0;
 			int orig_dst_y = 0;
-			int dst_x = r->x;
+			int dst_x = r->x + _currentShakeXOffset;
 			int src_y;
 			int src_x;
 
-			if (dst_y < height) {
+			if (dst_x < width && dst_y < height) {
+				dst_w = r->w;
+				if (dst_w > width - dst_x)
+					dst_w = width - dst_x;
+
 				dst_h = r->h;
 				if (dst_h > height - dst_y)
 					dst_h = height - dst_y;
@@ -378,10 +396,10 @@ void LinuxmotoSdlGraphicsManager::internUpdateScreen() {
 			}
 
 			if (_videoMode.mode == GFX_HALF && scalerProc == DownscaleAllByHalf) {
-				r->w = r->w / 2;
+				r->w = dst_w / 2;
 				r->h = dst_h / 2;
 			} else {
-				r->w = r->w;
+				r->w = dst_w;
 				r->h = dst_h;
 			}
 
@@ -399,7 +417,9 @@ void LinuxmotoSdlGraphicsManager::internUpdateScreen() {
 		// Readjust the dirty rect list in case we are doing a full update.
 		// This is necessary if shaking is active.
 		if (_forceRedraw) {
+			_dirtyRectList[0].x = 0;
 			_dirtyRectList[0].y = 0;
+			_dirtyRectList[0].w = (_videoMode.mode == GFX_HALF) ? _videoMode.hardwareWidth / 2 : _videoMode.hardwareWidth;
 			_dirtyRectList[0].h = (_videoMode.mode == GFX_HALF) ? _videoMode.hardwareHeight / 2 : _videoMode.hardwareHeight;
 		}
 
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