From ce1e9a11c89c83356d797c8225369b711513a4da Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Mon, 21 Jan 2013 20:36:48 +0100
Subject: [PATCH] improved Texture::Render()

---
 src/graphics/Texture.cpp | 41 ++++++++++++++++++++++++++++------------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
index db45b3d..97094bc 100644
--- a/src/graphics/Texture.cpp
+++ b/src/graphics/Texture.cpp
@@ -40,21 +40,38 @@ void Texture::Render(SDL_Surface *dest, const Vector<int> &from, const Vector<in
 	SDL_Rect srcRect;
 	srcRect.x = offset.X();
 	srcRect.y = offset.Y();
+	srcRect.h = size.Y();
+	srcRect.w = size.X();
 
-	for (destRect.y = from.Y(); destRect.y < to.Y(); destRect.y += size.Y()) {
+	const Vector<int> total = to - from;
+	const Vector<int> over = total % size;
+	const Vector<int> target = from + (total - over);
+
+	for (destRect.y = from.Y(); destRect.y < target.Y(); destRect.y += size.Y()) {
+		for (destRect.x = from.X(); destRect.x < target.X(); destRect.x += size.X()) {
+			SDL_BlitSurface(surface, &srcRect, dest, &destRect);
+		}
+	}
+	if (over.X() > 0) {
+		destRect.x = target.X();
+		srcRect.w = over.X();
 		srcRect.h = size.Y();
-		destRect.h = size.Y();
-		if (destRect.y + destRect.h > to.Y()) {
-			srcRect.h = to.Y() - destRect.y;
-			destRect.h = to.Y() - destRect.y;
+		for (destRect.y = from.Y(); destRect.y < target.Y(); destRect.y += size.Y()) {
+			SDL_BlitSurface(surface, &srcRect, dest, &destRect);
+		}
+	}
+	if (over.Y() > 0) {
+		destRect.y = target.Y();
+		srcRect.w = size.X();
+		srcRect.h = over.Y();
+		for (destRect.x = from.X(); destRect.x < target.X(); destRect.x += size.X()) {
+			SDL_BlitSurface(surface, &srcRect, dest, &destRect);
 		}
-		for (destRect.x = from.X(); destRect.x < to.X(); destRect.x += size.X()) {
-			srcRect.w = size.X();
-			destRect.w = size.X();
-			if (destRect.x + destRect.w > to.X()) {
-				srcRect.w = to.X() - destRect.x;
-				destRect.w = to.X() - destRect.x;
-			}
+		if (over.X() > 0) {
+			srcRect.w = over.X();
+			srcRect.h = over.Y();
+			destRect.x = target.X();
+			destRect.y = target.Y();
 			SDL_BlitSurface(surface, &srcRect, dest, &destRect);
 		}
 	}
-- 
2.39.2