From caca4505197d60de5b64640e25dfb7dab7f63ab6 Mon Sep 17 00:00:00 2001
From: gewlitys <gewlitys@8092fc87-c524-0410-9efc-e669fe64eaf9>
Date: Sun, 22 Dec 2002 17:38:22 +0000
Subject: [PATCH] Some optimizations to bilinear scaling

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@464 8092fc87-c524-0410-9efc-e669fe64eaf9
---
 sc2/src/sc2code/libs/graphics/sdl/pure.c | 84 ++++++++++++++----------
 1 file changed, 50 insertions(+), 34 deletions(-)

diff --git a/sc2/src/sc2code/libs/graphics/sdl/pure.c b/sc2/src/sc2code/libs/graphics/sdl/pure.c
index 317f8889f..9510f7692 100644
--- a/sc2/src/sc2code/libs/graphics/sdl/pure.c
+++ b/sc2/src/sc2code/libs/graphics/sdl/pure.c
@@ -254,32 +254,38 @@ static void Scale_Bilinear (SDL_Surface *src, SDL_Surface *dst)
 			src_p2 = src_p;
 			j = i;
 
+			p[0] = src_p[0];
+			if (y < h - 2)
+				p[2] = src_p[src->w];
+			else
+				p[2] = 0;
+
 			for (x = 0; x < w; ++x)
 			{
-				p[0] = src_p[0];
-				if (y < h - 2)
+				if (j == i)
 				{
-					p[2] = src_p[src->w];					
-					if (x < w - 2)
+					if (y < h - 2)
 					{
-						p[3] = src_p[src->w + 1];
-						p[1] = src_p[1];
+						if (x < w - 2)
+						{
+							p[1] = src_p[1];
+							p[3] = src_p[src->w + 1];
+						}
+						else
+						{
+							p[1] = 0;
+							p[3] = 0;
+						}
 					}
 					else
 					{
-						p[3] = p[2];
-						p[1] = p[0];
+						if (x < w - 2)
+							p[1] = src_p[1];
+						else
+							p[1] = 0;
+						p[3] = 0;
 					}
 				}
-				else
-				{
-					if (x < w - 2)
-						p[1] = src_p[1];
-					else
-						p[1] = p[0];
-					p[2] = p[0];
-					p[3] = p[1];
-				}
 
 				fa = bilinear_table[j][0];
 				fb = bilinear_table[j][1];
@@ -304,6 +310,8 @@ static void Scale_Bilinear (SDL_Surface *src, SDL_Surface *dst)
 				{
 					j = i;
 					src_p++;
+					p[0] = p[1];
+					p[2] = p[3];
 				}
 				else
 				{
@@ -336,32 +344,38 @@ static void Scale_Bilinear (SDL_Surface *src, SDL_Surface *dst)
 			src_p2 = src_p;
 			j = i;
 
+			p[0] = src_p[0];
+			if (y < h - 2)
+				p[2] = src_p[src->w];
+			else
+				p[2] = 0;
+
 			for (x = 0; x < w; ++x)
 			{
-				p[0] = src_p[0];
-				if (y < h - 2)
+				if (j == i)
 				{
-					p[2] = src_p[src->w];					
-					if (x < w - 2)
+					if (y < h - 2)
 					{
-						p[3] = src_p[src->w + 1];
-						p[1] = src_p[1];
+						if (x < w - 2)
+						{
+							p[1] = src_p[1];
+							p[3] = src_p[src->w + 1];
+						}
+						else
+						{
+							p[1] = 0;
+							p[3] = 0;
+						}
 					}
 					else
 					{
-						p[3] = p[2];
-						p[1] = p[0];
+						if (x < w - 2)
+							p[1] = src_p[1];
+						else
+							p[1] = 0;
+						p[3] = 0;
 					}
 				}
-				else
-				{
-					if (x < w - 2)
-						p[1] = src_p[1];
-					else
-						p[1] = p[0];
-					p[2] = p[0];
-					p[3] = p[1];
-				}
 
 				fa = bilinear_table[j][0];
 				fb = bilinear_table[j][1];
@@ -386,6 +400,8 @@ static void Scale_Bilinear (SDL_Surface *src, SDL_Surface *dst)
 				{
 					j = i;
 					src_p++;
+					p[0] = p[1];
+					p[2] = p[3];
 				}
 				else
 				{