[render] Split out filter finding from filter setting.

To prepare for RandR using filters in transforms, split out
code paths so that the RandR code can validate the filter name and
parameters during the transform set operation so that use of the filter
later will not have unreportable errors.

1 files changed, 40 insertions, 17 deletions

diff --git a/render/filter.c b/render/filter.c
index aa3eb1a9e..e499fc44e 100644
--- a/render/filter.c
+++ b/render/filter.c
@@ -213,7 +213,7 @@ PictureFindFilter (ScreenPtr pScreen, char *name, int len)
 }
 
 static Bool
-convolutionFilterValidateParams (PicturePtr pPicture,
+convolutionFilterValidateParams (ScreenPtr pScreen,
                                  int	   filter,
                                  xFixed	   *params,
                                  int	   nparams)
@@ -270,29 +270,51 @@ int
 SetPictureFilter (PicturePtr pPicture, char *name, int len, xFixed *params, int nparams)
 {
     PictFilterPtr	pFilter;
-    xFixed		*new_params;
-    int			i, s, result;
+    ScreenPtr		pScreen;
 
-    pFilter = PictureFindFilter (screenInfo.screens[0], name, len);
+    if (pPicture->pDrawable != NULL)
+	pScreen = pPicture->pDrawable->pScreen;
+    else
+	pScreen = screenInfo.screens[0];
+
+    pFilter = PictureFindFilter (pScreen, name, len);
+
+    if (!pFilter)
+	return BadName;
 
-    if (pPicture->pDrawable == NULL) {
+    if (pPicture->pDrawable == NULL)
+    {
+	int s;
 	/* For source pictures, the picture isn't tied to a screen.  So, ensure
 	 * that all screens can handle a filter we set for the picture.
 	 */
-	for (s = 0; s < screenInfo.numScreens; s++) {
-	    if (PictureFindFilter (screenInfo.screens[s], name, len)->id !=
-		pFilter->id)
-	    {
+	for (s = 1; s < screenInfo.numScreens; s++)
+	{
+	    PictFilterPtr   pScreenFilter;
+	    pScreenFilter = PictureFindFilter (screenInfo.screens[s],
+					       name, len);
+	    if (!pScreenFilter || pScreenFilter->id != pFilter->id)
 		return BadMatch;
-	    }
 	}
     }
+    return SetPicturePictFilter (pPicture, pFilter, params, nparams);
+}
+
+int
+SetPicturePictFilter (PicturePtr pPicture, PictFilterPtr pFilter,
+		      xFixed *params, int nparams)
+{
+    ScreenPtr	pScreen;
+    int		i;
+
+    if (pPicture->pDrawable)
+	pScreen = pPicture->pDrawable->pScreen;
+    else
+	pScreen = screenInfo.screens[0];
 
-    if (!pFilter)
-	return BadName;
     if (pFilter->ValidateParams)
     {
-	if (!(*pFilter->ValidateParams) (pPicture, pFilter->id, params, nparams))
+	if (!(*pFilter->ValidateParams) (pScreen, pFilter->id, params, nparams))
 	    return BadMatch;
     }
     else if (nparams)
@@ -300,7 +322,7 @@ SetPictureFilter (PicturePtr pPicture, char *name, int len, xFixed *params, int
 
     if (nparams != pPicture->filter_nparams)
     {
-	new_params = xalloc (nparams * sizeof (xFixed));
+	xFixed *new_params = xalloc (nparams * sizeof (xFixed));
 	if (!new_params && nparams)
 	    return BadAlloc;
 	xfree (pPicture->filter_params);
@@ -311,9 +333,10 @@ SetPictureFilter (PicturePtr pPicture, char *name, int len, xFixed *params, int
 	pPicture->filter_params[i] = params[i];
     pPicture->filter = pFilter->id;
 
-    if (pPicture->pDrawable) {
-	ScreenPtr pScreen = pPicture->pDrawable->pScreen;
-	PictureScreenPtr ps = GetPictureScreen(pScreen);
+    if (pPicture->pDrawable)
+    {
+	PictureScreenPtr    ps = GetPictureScreen(pScreen);
+	int		    result;
 
 	result = (*ps->ChangePictureFilter) (pPicture, pPicture->filter,
 					     params, nparams);