From 9682c8870b8ff5e4ac2e4c70b759f791c6f38c1f Mon Sep 17 00:00:00 2001
From: Jesse Hall <jessehall@google.com>
Date: Mon, 9 Jul 2012 11:27:07 -0700
Subject: Import SDL release-1.2.15

Change-Id: I505c4aea24325cad475f217db5589814b4c75dbf
---
 distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c | 142 ++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c

(limited to 'distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c')

diff --git a/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c b/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c
new file mode 100644
index 0000000..c6afbda
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/video/x11/SDL_x11gamma.c
@@ -0,0 +1,142 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL.h"
+#include "SDL_events.h"
+#include "../../events/SDL_events_c.h"
+#include "SDL_x11video.h"
+
+/* From the X server sources... */
+#define MAX_GAMMA 10.0
+#define MIN_GAMMA (1.0/MAX_GAMMA)
+
+static int X11_SetGammaNoLock(_THIS, float red, float green, float blue)
+{
+#if SDL_VIDEO_DRIVER_X11_VIDMODE
+    if (use_vidmode >= 200) {
+        SDL_NAME(XF86VidModeGamma) gamma;
+        Bool succeeded;
+
+	/* Clamp the gamma values */
+	if ( red < MIN_GAMMA ) {
+		gamma.red = MIN_GAMMA;
+	} else
+	if ( red > MAX_GAMMA ) {
+		gamma.red = MAX_GAMMA;
+	} else {
+        	gamma.red = red;
+	}
+	if ( green < MIN_GAMMA ) {
+		gamma.green = MIN_GAMMA;
+	} else
+	if ( green > MAX_GAMMA ) {
+		gamma.green = MAX_GAMMA;
+	} else {
+        	gamma.green = green;
+	}
+	if ( blue < MIN_GAMMA ) {
+		gamma.blue = MIN_GAMMA;
+	} else
+	if ( blue > MAX_GAMMA ) {
+		gamma.blue = MAX_GAMMA;
+	} else {
+        	gamma.blue = blue;
+	}
+        if ( SDL_GetAppState() & SDL_APPACTIVE ) {
+            succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &gamma);
+            XSync(SDL_Display, False);
+        } else {
+            gamma_saved[0] = gamma.red;
+            gamma_saved[1] = gamma.green;
+            gamma_saved[2] = gamma.blue;
+            succeeded = True;
+        }
+        if ( succeeded ) {
+            ++gamma_changed;
+        }
+        return succeeded ? 0 : -1;
+    }
+#endif
+    SDL_SetError("Gamma correction not supported");
+    return -1;
+}
+int X11_SetVidModeGamma(_THIS, float red, float green, float blue)
+{
+    int result;
+
+    SDL_Lock_EventThread();
+    result = X11_SetGammaNoLock(this, red, green, blue);
+    SDL_Unlock_EventThread();
+
+    return(result);
+}
+
+static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue)
+{
+#if SDL_VIDEO_DRIVER_X11_VIDMODE
+    if (use_vidmode >= 200) {
+        SDL_NAME(XF86VidModeGamma) gamma;
+        if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) {
+            *red   = gamma.red;
+            *green = gamma.green;
+            *blue  = gamma.blue;
+            return 0;
+        }
+        return -1;
+    }
+#endif
+    return -1;
+}
+int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue)
+{
+    int result;
+
+    SDL_Lock_EventThread();
+    result = X11_GetGammaNoLock(this, red, green, blue);
+    SDL_Unlock_EventThread();
+
+    return(result);
+}
+
+void X11_SaveVidModeGamma(_THIS)
+{
+    /* Try to save the current gamma, otherwise disable gamma control */
+    if ( X11_GetGammaNoLock(this,
+              &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) {
+        this->SetGamma = 0;
+        this->GetGamma = 0;
+    }
+    gamma_changed = 0;
+}
+void X11_SwapVidModeGamma(_THIS)
+{
+    float new_gamma[3];
+
+    if ( gamma_changed ) {
+        new_gamma[0] = gamma_saved[0];
+        new_gamma[1] = gamma_saved[1];
+        new_gamma[2] = gamma_saved[2];
+        X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]);
+        X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]);
+    }
+}
-- 
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