abslibre/libre/sdl/SDL-1.2.15-x11-Bypass-SetGammaRamp-when-changing-gamma.patch

From 4b56fa058a45b7c804d1a5fcaf7a70db0bd0581c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <petr.pisar@atlas.cz>
Date: Tue, 1 Jan 2013 21:25:15 +0100
Subject: [PATCH] x11: Bypass SetGammaRamp when changing gamma

Recent Xorg has broken dynamic colors setting, so calling SDL_SetGamme()
does not have any effect here. Recent means xorg-server >= 1.7, since 2010.
See <https://bugs.freedesktop.org/show_bug.cgi?id=27222>.
---
 src/video/SDL_gamma.c |   15 ++-------------
 1 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/src/video/SDL_gamma.c b/src/video/SDL_gamma.c
index 4fd0370..464ab88 100644
--- a/src/video/SDL_gamma.c
+++ b/src/video/SDL_gamma.c
@@ -92,22 +92,11 @@ static void CalculateGammaFromRamp(float *gamma, Uint16 *ramp)
 
 int SDL_SetGamma(float red, float green, float blue)
 {
-	int succeeded;
+	int succeeded = -1;
 	SDL_VideoDevice *video = current_video;
 	SDL_VideoDevice *this  = current_video;	
 
-	succeeded = -1;
-	/* Prefer using SetGammaRamp(), as it's more flexible */
-	{
-		Uint16 ramp[3][256];
-
-		CalculateGammaRamp(red, ramp[0]);
-		CalculateGammaRamp(green, ramp[1]);
-		CalculateGammaRamp(blue, ramp[2]);
-		succeeded = SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]);
-	}
-	if ( (succeeded < 0) && video->SetGamma ) {
-		SDL_ClearError();
+	if ( video->SetGamma ) {
 		succeeded = video->SetGamma(this, red, green, blue);
 	}
 	return succeeded;
-- 
1.7.8.6