Fix drawing of vertically clipped surfaces.

Also fix bottom platforms disappearing and wrong coordinates being
sent to the function that draws debug lines. Obviously debug lines
drawing is still messed up... but at least you see the two lines!

src/jumping/platform.cpp

@@ -61,7 +61,7 @@ namespace cloonel {
 	///--------------------------------------------------------------------------
 	///--------------------------------------------------------------------------
 	void Platform::Draw() const {
-		m_surface->Render(TopLeft(), m_size, m_screenRatio.Ratio(), true);
+		m_surface->Render(BottomLeft(), m_size, m_screenRatio.Ratio(), true);
 #if defined(WITH_DEBUG_VISUALS)
 		m_collisionTopDrawable.Render(m_collisionTop->From(), m_screenRatio.Ratio());
 		m_collisionTopDrawable.Render(TopLeft(), m_screenRatio.Ratio());

src/jumping/platform.hpp

@@ -47,8 +47,8 @@ namespace cloonel {
 		virtual ~Platform ( void ) noexcept;
 		Platform& operator= ( const Platform& parOther );
 
-		float2 TopLeft ( void ) const { return GetPos(); }
+		float2 BottomLeft ( void ) const { return GetPos(); }
-		float2 BottomRight ( void ) const { return TopLeft() + m_size; }
+		float2 TopLeft ( void ) const { return GetPos() + float2(0.0f, m_size.y()); }
 		const HorzCollisionBar* TopCollisionBar ( void ) const { return m_collisionTop.get(); }
 		void CopyDrawables ( std::vector<const Drawable*>& parOut ) const;
 

src/jumping/platformset.cpp

@@ -35,7 +35,7 @@ namespace cloonel {
 		///----------------------------------------------------------------------
 		boost::circular_buffer<Platform>::const_iterator FindFirstVisible (const boost::circular_buffer<Platform>& parPlatforms) {
 			auto curr = parPlatforms.begin();
-			while (curr != parPlatforms.end() and curr->TopLeft().y() < 0.0f) {
+			while (curr != parPlatforms.end() and curr->TopLeft().y() <= 0.0f) {
 				++curr;
 			}
 			return curr;

src/jumping/texture.cpp

@@ -388,7 +388,8 @@ namespace cloonel {
 		}
 #endif
 
-		const SDL_Rect sdlsrc(src);
+		SDL_Rect sdlsrc(src);
+		sdlsrc.y = static_cast<decltype(sdlsrc.y)>(m_size.y()) - sdlsrc.y - sdlsrc.h;
 		SDL_Rect sdldst(dest);
 		sdldst.y = m_sdlmain->WidthHeight().y() - sdldst.y - sdldst.h;