From 6b4195a542083c97f696c843b9823d578b018996 Mon Sep 17 00:00:00 2001
From: Thierry Crozat
Date: Sat, 11 Nov 2017 00:18:57 +0000
Subject: SDL: Use RLE acceleration for SDL2 transparent surfaces

We were already doing it for SDL1.2, but with SDL2 the SDL_RLEACCEL
is not passed to SDL and instead we need to call SDL_SetSurfaceRLE.
---
 backends/platform/sdl/sdl.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'backends/platform/sdl')

diff --git a/backends/platform/sdl/sdl.cpp b/backends/platform/sdl/sdl.cpp
index f44d87666a..f2bf9590c5 100644
--- a/backends/platform/sdl/sdl.cpp
+++ b/backends/platform/sdl/sdl.cpp
@@ -754,10 +754,13 @@ int SDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha) {
 		if (SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE)) {
 			return -1;
 		}
+		SDL_SetSurfaceRLE(surface, 0);
 	} else {
 		if (SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND)) {
 			return -1;
 		}
+		if (flag & SDL_RLEACCEL)
+			SDL_SetSurfaceRLE(surface, 1);
 	}
 
 	return 0;
@@ -765,7 +768,13 @@ int SDL_SetAlpha(SDL_Surface *surface, Uint32 flag, Uint8 alpha) {
 
 #undef SDL_SetColorKey
 int SDL_SetColorKey_replacement(SDL_Surface *surface, Uint32 flag, Uint32 key) {
-	return SDL_SetColorKey(surface, SDL_TRUE, key) ? -1 : 0;
+	if (SDL_SetColorKey(surface, SDL_TRUE, key)) {
+		return -1;
+	}
+
+	if (flag & SDL_RLEACCEL)
+		SDL_SetSurfaceRLE(surface, 1);
+	return 0;
 }
 #endif
 
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