[Openchrome-users] xgamma enabled

[Thomas Hellström]

Gonzalo A. de la Vega wrote:

> The following patch lets xgamma change the screen gamma, at least in 
> 24 bit mode, in K8M800... that's what I've tested.

Hmm,

Does not seem to be a patch against openChrome SVN?

/Thomas

>
> Gonzalo
>
>------------------------------------------------------------------------
>
>--- ./unichrome/via_driver.c	2006-12-05 20:24:21.000000000 -0300
>+++ ./unichrome/via_driver.c	2006-12-05 20:22:49.000000000 -0300
>@@ -82,6 +82,7 @@
> static void VIAUnmapMem(ScrnInfoPtr pScrn);
> 
> static void VIALoadRgbLut(ScrnInfoPtr pScrn, LOCO *colors);
>+static int VIAChangeGamma(int myNum, Gamma gamma);
> 
> DriverRec VIA =
> {
>@@ -1340,25 +1341,6 @@
> 	    VIAFreeRec(pScrn);
>             return FALSE;
>         }
>-    /* The above code only sets the gamma values in the screen info structure.
>-     * We should now build the LUT and call VIALoadRgbLut().
>-     * I don't know what happens if the LUT values go over 255, so I limited
>-     * since a value higher than that seem to be useles anyway (with 255 the
>-     * screen saturates).
>-     */
>-    LOCO *colors;
>-    colors=malloc(256*3*sizeof(unsigned short));
>-    int cindex;
>-    for(cindex=0;cindex<256;cindex++) {
>-       colors[cindex].red=(unsigned short)(192*powf((float)cindex/255,1/pScrn->gamma.red));
>-       colors[cindex].green=(unsigned short)(192*powf((float)cindex/255,1/pScrn->gamma.green));
>-       colors[cindex].blue=(unsigned short)(192*powf((float)cindex/255,1/pScrn->gamma.blue));
>-
>-
>-
>-       }
>-    VIALoadRgbLut(pScrn, colors);
>-
>     }
> 
>     /* detect amount of installed ram */
>@@ -2190,7 +2172,34 @@
>     return;
> }
> 
>+int VIAChangeGamma(int myNum, Gamma gamma)
>+{
>+    LOCO *colors;
>+    colors=malloc(256*3*sizeof(unsigned short));
>+    int cindex;
>+    
>+    ScrnInfoPtr pScrn = xf86Screens[myNum];
>+
>+    if (gamma.red < GAMMA_MIN || gamma.red > GAMMA_MAX ||
>+        gamma.green < GAMMA_MIN || gamma.green > GAMMA_MAX ||
>+        gamma.blue < GAMMA_MIN || gamma.blue > GAMMA_MAX)
>+        return BadValue;
>+
>+    pScrn->gamma.red = gamma.red;
>+    pScrn->gamma.green = gamma.green;
>+    pScrn->gamma.blue = gamma.blue;
>+
>+    for(cindex=0;cindex<256;cindex++) {
>+       colors[cindex].red=(unsigned short)(255*powf((float)cindex/255,1/pScrn->gamma.red));
>+       colors[cindex].green=(unsigned short)(255*powf((float)cindex/255,1/pScrn->gamma.green));
>+       colors[cindex].blue=(unsigned short)(255*powf((float)cindex/255,1/pScrn->gamma.blue));
> 
>+       }
>+
>+    VIALoadRgbLut(pScrn, colors);
>+    return Success;
>+}
>+ 
> 
> /*
>  *
>@@ -2328,7 +2337,7 @@
>     pVia->CloseScreen = pScreen->CloseScreen;
>     pScreen->SaveScreen = VIASaveScreen;
>     pScreen->CloseScreen = VIACloseScreen;
>-
>+    pScrn->ChangeGamma = VIAChangeGamma;
>     xf86DPMSInit(pScreen, VIADPMS, 0);
>     DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO, "- DPMS set up\n"));
> 
>  
>
>------------------------------------------------------------------------
>
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