randr: Improve per-crtc gamma support.

- The Gamma values from the monitor section are now used during initial config.
- The old colormap system is disabled when gamma set hook is available.
- Gamma values are now persistent for the lifetime of the xserver.
- This requires no driver changes and should be driver ABI compatible.

hw/xfree86/common/Makefile.am

@@ -42,7 +42,7 @@ INCLUDES = $(XORG_INCS) -I$(srcdir)/../ddc -I$(srcdir)/../i2c \
 	   -I$(srcdir)/../loader -I$(srcdir)/../rac -I$(srcdir)/../parser \
            -I$(srcdir)/../vbe -I$(srcdir)/../int10 \
 	   -I$(srcdir)/../vgahw -I$(srcdir)/../dixmods/extmod \
-	   -I$(srcdir)/../modes
+	   -I$(srcdir)/../modes -I$(srcdir)/../ramdac
 
 sdk_HEADERS = compiler.h fourcc.h xf86.h xf86Module.h xf86Opt.h \
               xf86PciInfo.h xf86Priv.h xf86Privstr.h xf86Resources.h \

hw/xfree86/common/xf86Helper.c

@@ -60,6 +60,7 @@
 #include "mivalidate.h"
 #include "xf86RAC.h"
 #include "xf86Bus.h"
+#include "xf86Crtc.h"
 
 /* For xf86GetClocks */
 #if defined(CSRG_BASED) || defined(__GNU__)
@@ -918,6 +919,11 @@ Bool
 xf86SetGamma(ScrnInfoPtr scrp, Gamma gamma)
 {
     MessageType from = X_DEFAULT;
+    /* Pretend we succeeded if we support better a gamma system.
+     * This avoids a confusing message.
+     */
+    if (xf86_crtc_supports_gamma(scrp))
+	return TRUE;
 #if 0
     xf86MonPtr DDC = (xf86MonPtr)(scrp->monitor->DDC);
 #endif

hw/xfree86/common/xf86cmap.c

@@ -49,6 +49,7 @@
 #include "xf86_OSproc.h"
 #include "xf86str.h"
 #include "micmap.h"
+#include "xf86Crtc.h"
 
 #ifdef XFreeXDGA
 #define _XF86DGA_SERVER_
@@ -141,6 +142,10 @@ Bool xf86HandleColormaps(
     int *indices; 
     int elements;
 
+    /* If we support a better colormap system, then pretend we succeeded. */
+    if (xf86_crtc_supports_gamma(pScrn))
+	return TRUE;
+
     if(!maxColors || !sigRGBbits || !loadPalette)
 	return FALSE;
 

hw/xfree86/modes/xf86Crtc.c

@@ -117,6 +117,12 @@ xf86CrtcCreate (ScrnInfoPtr		scrn,
     crtc->desiredTransformPresent = FALSE;
     memset (&crtc->bounds, '\0', sizeof (crtc->bounds));
 
+    /* Preallocate gamma at a sensible size. */
+    crtc->gamma_size = 256;
+    crtc->gamma_red = malloc(3 * crtc->gamma_size * sizeof (CARD16));
+    crtc->gamma_green = crtc->gamma_red + crtc->gamma_size;
+    crtc->gamma_blue = crtc->gamma_green + crtc->gamma_size;
+
     if (xf86_config->crtc)
 	crtcs = xrealloc (xf86_config->crtc,
 			  (xf86_config->num_crtc + 1) * sizeof (xf86CrtcPtr));
@@ -150,6 +156,7 @@ xf86CrtcDestroy (xf86CrtcPtr crtc)
 	}
     if (crtc->params)
 	xfree (crtc->params);
+    free(crtc->gamma_red);
     xfree (crtc);
 }
 
@@ -2207,6 +2214,97 @@ xf86TargetUserpref(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
     return FALSE;
 }
 
+static Bool
+xf86CrtcSetInitialGamma(xf86CrtcPtr crtc, float gamma_red, float gamma_green,
+        float gamma_blue)
+{
+    int i, size = 256;
+    CARD16 *red, *green, *blue;
+
+    red = malloc(3 * size * sizeof(CARD16));
+    green = red + size;
+    blue = green + size;
+
+     /* Only cause warning if user wanted gamma to be set. */
+    if (!crtc->funcs->gamma_set && (gamma_red != 1.0 || gamma_green != 1.0 || gamma_blue != 1.0))
+        return FALSE;
+    else if (!crtc->funcs->gamma_set)
+        return TRUE;
+
+    /* At this early stage none of the randr-interface stuff is up.
+     * So take the default gamma size for lack of something better.
+     */
+    for (i = 0; i < size; i++) {
+        /* Code partially borrowed from ComputeGamma(). */
+        if (gamma_red == 1.0)
+            red[i] = i << 8;
+        else
+            red[i] = (CARD16)((pow((double)i/(double)size,
+                        gamma_red) * (double)size + 0.5)*256);
+
+        if (gamma_green == 1.0)
+            green[i] = i << 8;
+        else
+            green[i] = (CARD16)((pow((double)i/(double)size,
+                        gamma_green) * (double)size + 0.5)*256);
+
+        if (gamma_blue == 1.0)
+            blue[i] = i << 8;
+        else
+            blue[i] = (CARD16)((pow((double)i/(double)size,
+                        gamma_blue) * (double)size + 0.5)*256);
+    }
+
+    /* Default size is 256, so anything else is failure. */
+    if (size != crtc->gamma_size)
+        return FALSE;
+
+    crtc->gamma_size = size;
+    memcpy (crtc->gamma_red, red, crtc->gamma_size * sizeof (CARD16));
+    memcpy (crtc->gamma_green, green, crtc->gamma_size * sizeof (CARD16));
+    memcpy (crtc->gamma_blue, blue, crtc->gamma_size * sizeof (CARD16));
+
+    /* Use copied values, the perfect way to test if all went well. */
+    crtc->funcs->gamma_set(crtc, crtc->gamma_red, crtc->gamma_green,
+                                            crtc->gamma_blue, crtc->gamma_size);
+
+    free(red);
+
+    return TRUE;
+}
+
+static Bool
+xf86OutputSetInitialGamma(xf86OutputPtr output)
+{
+    XF86ConfMonitorPtr mon = output->conf_monitor;
+    float gamma_red = 1.0, gamma_green = 1.0, gamma_blue = 1.0;
+    
+    if (!mon)
+        return TRUE;
+
+    if (!output->crtc)
+        return FALSE;
+
+    /* Get configured values, where they exist. */
+    if (mon->mon_gamma_red >= GAMMA_MIN &&
+        mon->mon_gamma_red <= GAMMA_MAX)
+            gamma_red = mon->mon_gamma_red;
+
+    if (mon->mon_gamma_green >= GAMMA_MIN &&
+        mon->mon_gamma_green <= GAMMA_MAX)
+            gamma_green = mon->mon_gamma_green;
+
+    if (mon->mon_gamma_blue >= GAMMA_MIN &&
+        mon->mon_gamma_blue <= GAMMA_MAX)
+            gamma_blue = mon->mon_gamma_blue;
+
+    /* This avoids setting gamma 1.0 in case another cloned output on this crtc has a specific gamma. */
+    if (gamma_red != 1.0 || gamma_green != 1.0 || gamma_blue != 1.0) {
+	xf86DrvMsg(output->scrn->scrnIndex, X_INFO, "Output %s wants gamma correction (%.1f, %.1f, %.1f)\n", output->name, gamma_red, gamma_green, gamma_blue);
+	return xf86CrtcSetInitialGamma(output->crtc, gamma_red, gamma_green, gamma_blue);
+    }else
+	return TRUE;
+}
 
 /**
  * Construct default screen configuration
@@ -2317,8 +2415,14 @@ xf86InitialConfiguration (ScrnInfoPtr scrn, Bool canGrow)
 
 	crtc->enabled = FALSE;
 	memset (&crtc->desiredMode, '\0', sizeof (crtc->desiredMode));
+	/* Set default gamma for all crtc's. */
+	/* This is done to avoid problems later on with cloned outputs. */
+	xf86CrtcSetInitialGamma(crtc, 1.0, 1.0, 1.0);
     }
 
+    if (xf86_crtc_supports_gamma(scrn))
+	xf86DrvMsg(scrn->scrnIndex, X_INFO, "Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.\n");
+
     /*
      * Set initial configuration
      */
@@ -2342,6 +2446,8 @@ xf86InitialConfiguration (ScrnInfoPtr scrn, Bool canGrow)
 	    memcpy (&crtc->panningTrackingArea, &output->initialTrackingArea, sizeof(BoxRec));
 	    memcpy (crtc->panningBorder,        output->initialBorder,        4*sizeof(INT16));
 	    output->crtc = crtc;
+	    if (!xf86OutputSetInitialGamma(output))
+		xf86DrvMsg (scrn->scrnIndex, X_WARNING, "Initial gamma correction for output %s: failed.\n", output->name);
 	} else {
 	    output->crtc = NULL;
 	}
@@ -3029,3 +3135,21 @@ xf86_crtc_notify(ScreenPtr screen)
     if (config->xf86_crtc_notify)
 	config->xf86_crtc_notify(screen);
 }
+
+Bool
+xf86_crtc_supports_gamma(ScrnInfoPtr pScrn)
+{
+    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
+    xf86CrtcPtr crtc;
+    int c;
+
+    for (c = 0; c < xf86_config->num_crtc; c++) {
+        crtc = xf86_config->crtc[c];
+        if (crtc->funcs->gamma_set)
+            return TRUE;
+        else
+            return FALSE;
+    }
+
+    return FALSE;
+}

hw/xfree86/modes/xf86Crtc.h

@@ -337,6 +337,14 @@ struct _xf86Crtc {
     BoxRec          panningTotalArea;
     BoxRec          panningTrackingArea;
     INT16           panningBorder[4];
+
+    /**
+     * Current gamma, especially useful after initial config.
+     */
+    CARD16 *gamma_red;
+    CARD16 *gamma_green;
+    CARD16 *gamma_blue;
+    int gamma_size;
 };
 
 typedef struct _xf86OutputFuncs {
@@ -914,4 +922,12 @@ xf86_crtc_set_panning(ScrnInfoPtr pScrn,
 		      BoxPtr      TrackingArea,
 		      INT16      *border);
 
+
+/**
+ * Gamma
+ */
+
+Bool
+xf86_crtc_supports_gamma(ScrnInfoPtr pScrn);
+
 #endif /* _XF86CRTC_H_ */

hw/xfree86/modes/xf86RandR12.c

@@ -1046,8 +1046,55 @@ xf86RandR12CrtcSetGamma (ScreenPtr    pScreen,
     if (!crtc->scrn->vtSema)
 	return TRUE;
 
-    crtc->funcs->gamma_set(crtc, randr_crtc->gammaRed, randr_crtc->gammaGreen,
+    /* Realloc local gamma if needed. */
-			   randr_crtc->gammaBlue, randr_crtc->gammaSize);
+    if (randr_crtc->gammaSize != crtc->gamma_size) {
+        CARD16 *tmp_ptr;
+        tmp_ptr = realloc(crtc->gamma_red, 3 * crtc->gamma_size * sizeof (CARD16));
+        if (!tmp_ptr)
+            return FALSE;
+        crtc->gamma_red = tmp_ptr;
+        crtc->gamma_green = crtc->gamma_red + crtc->gamma_size;
+        crtc->gamma_blue = crtc->gamma_green + crtc->gamma_size;
+    }
+
+    crtc->gamma_size = randr_crtc->gammaSize;
+    memcpy (crtc->gamma_red, randr_crtc->gammaRed, crtc->gamma_size * sizeof (CARD16));
+    memcpy (crtc->gamma_green, randr_crtc->gammaGreen, crtc->gamma_size * sizeof (CARD16));
+    memcpy (crtc->gamma_blue, randr_crtc->gammaBlue, crtc->gamma_size * sizeof (CARD16));
+
+    /* Use copied values, the perfect way to test if all went well. */
+    crtc->funcs->gamma_set(crtc, crtc->gamma_red, crtc->gamma_green,
+                                            crtc->gamma_blue, crtc->gamma_size);
+
+    return TRUE;
+}
+
+static Bool
+xf86RandR12CrtcGetGamma (ScreenPtr    pScreen,
+			 RRCrtcPtr    randr_crtc)
+{
+    xf86CrtcPtr crtc = randr_crtc->devPrivate;
+
+    if (!crtc->gamma_size)
+        return FALSE;
+
+    if (!crtc->gamma_red || !crtc->gamma_green || !crtc->gamma_blue)
+        return FALSE;
+
+    /* Realloc randr gamma if needed. */
+    if (randr_crtc->gammaSize != crtc->gamma_size) {
+        CARD16 *tmp_ptr;
+        tmp_ptr = realloc(randr_crtc->gammaRed, 3 * crtc->gamma_size * sizeof (CARD16));
+        if (!tmp_ptr)
+            return FALSE;
+        randr_crtc->gammaRed = tmp_ptr;
+        randr_crtc->gammaGreen = randr_crtc->gammaRed + crtc->gamma_size;
+        randr_crtc->gammaBlue = randr_crtc->gammaGreen + crtc->gamma_size;
+    }
+    randr_crtc->gammaSize = crtc->gamma_size;
+    memcpy (randr_crtc->gammaRed, crtc->gamma_red, crtc->gamma_size * sizeof (CARD16));
+    memcpy (randr_crtc->gammaGreen, crtc->gamma_green, crtc->gamma_size * sizeof (CARD16));
+    memcpy (randr_crtc->gammaBlue, crtc->gamma_blue, crtc->gamma_size * sizeof (CARD16));
 
     return TRUE;
 }
@@ -1443,6 +1490,7 @@ xf86RandR12Init12 (ScreenPtr pScreen)
     rp->rrScreenSetSize = xf86RandR12ScreenSetSize;
     rp->rrCrtcSet = xf86RandR12CrtcSet;
     rp->rrCrtcSetGamma = xf86RandR12CrtcSetGamma;
+    rp->rrCrtcGetGamma = xf86RandR12CrtcGetGamma;
     rp->rrOutputSetProperty = xf86RandR12OutputSetProperty;
     rp->rrOutputValidateMode = xf86RandR12OutputValidateMode;
 #if RANDR_13_INTERFACE

randr/randrstr.h

@@ -173,6 +173,9 @@ typedef Bool (*RRCrtcSetProcPtr) (ScreenPtr		pScreen,
 typedef Bool (*RRCrtcSetGammaProcPtr) (ScreenPtr	pScreen,
 				       RRCrtcPtr	crtc);
 
+typedef Bool (*RRCrtcGetGammaProcPtr) (ScreenPtr	pScreen,
+				       RRCrtcPtr	crtc);
+
 typedef Bool (*RROutputSetPropertyProcPtr) (ScreenPtr		pScreen,
 					    RROutputPtr		output,
 					    Atom		property,
@@ -245,6 +248,7 @@ typedef struct _rrScrPriv {
     RRScreenSetSizeProcPtr  rrScreenSetSize;
     RRCrtcSetProcPtr	    rrCrtcSet;
     RRCrtcSetGammaProcPtr   rrCrtcSetGamma;
+    RRCrtcGetGammaProcPtr   rrCrtcGetGamma;
     RROutputSetPropertyProcPtr	rrOutputSetProperty;
     RROutputValidateModeProcPtr	rrOutputValidateMode;
     RRModeDestroyProcPtr	rrModeDestroy;
@@ -585,6 +589,14 @@ RRCrtcGammaSet (RRCrtcPtr   crtc,
 		CARD16	    *green,
 		CARD16	    *blue);
 
+/*
+ * Request current gamma back from the DDX (if possible).
+ * This includes gamma size.
+ */
+ 
+extern _X_EXPORT Bool
+RRCrtcGammaGet(RRCrtcPtr crtc);
+
 /*
  * Notify the extension that the Crtc gamma has been changed
  * The driver calls this whenever it has changed the gamma values

randr/rrcrtc.c

@@ -479,6 +479,29 @@ RRCrtcGammaSet (RRCrtcPtr   crtc,
     return ret;
 }
 
+/*
+ * Request current gamma back from the DDX (if possible).
+ * This includes gamma size.
+ */
+Bool
+RRCrtcGammaGet(RRCrtcPtr crtc)
+{
+    Bool ret = TRUE;
+#if RANDR_12_INTERFACE
+    ScreenPtr	pScreen = crtc->pScreen;
+#endif
+
+#if RANDR_12_INTERFACE
+    if (pScreen)
+    {
+        rrScrPriv(pScreen);
+        if (pScrPriv->rrCrtcGetGamma)
+            ret = (*pScrPriv->rrCrtcGetGamma) (pScreen, crtc);
+    }
+#endif
+    return ret;
+}
+
 /*
  * Notify the extension that the Crtc gamma has been changed
  * The driver calls this whenever it has changed the gamma values
@@ -1142,6 +1165,10 @@ ProcRRGetCrtcGammaSize (ClientPtr client)
     if (!crtc)
 	return RRErrorBase + BadRRCrtc;
 
+    /* Gamma retrieval failed, any better error? */
+    if (!RRCrtcGammaGet(crtc))
+        return RRErrorBase + BadRRCrtc;
+
     reply.type = X_Reply;
     reply.sequenceNumber = client->sequence;
     reply.length = 0;
@@ -1170,6 +1197,10 @@ ProcRRGetCrtcGamma (ClientPtr client)
     if (!crtc)
 	return RRErrorBase + BadRRCrtc;
 
+    /* Gamma retrieval failed, any better error? */
+    if (!RRCrtcGammaGet(crtc))
+        return RRErrorBase + BadRRCrtc;
+
     len = crtc->gammaSize * 3 * 2;
     
     if (crtc->gammaSize) {