render: Always store client clip as a region

This does have one semantic change.  FixesCreateRegionFromPicture used to
throw BadImplementation if you tried to create a region from a picture
with no client clip.  I changed that to BadMatch here since that more
honestly describes what's going on.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 7 insertions, 27 deletions

diff --git a/render/mipict.c b/render/mipict.c
index 3959fc415..a72510480 100644
--- a/render/mipict.c
+++ b/render/mipict.c
@@ -49,23 +49,9 @@ miDestroyPicture(PicturePtr pPicture)
 void
 miDestroyPictureClip(PicturePtr pPicture)
 {
-    switch (pPicture->clientClipType) {
-    case CT_NONE:
-        return;
-    case CT_PIXMAP:
-        (*pPicture->pDrawable->pScreen->
-         DestroyPixmap) ((PixmapPtr) (pPicture->clientClip));
-        break;
-    default:
-        /*
-         * we know we'll never have a list of rectangles, since ChangeClip
-         * immediately turns them into a region
-         */
+    if (pPicture->clientClip)
         RegionDestroy(pPicture->clientClip);
-        break;
-    }
     pPicture->clientClip = NULL;
-    pPicture->clientClipType = CT_NONE;
 }
 
 int
@@ -73,37 +59,31 @@ miChangePictureClip(PicturePtr pPicture, int type, void *value, int n)
 {
     ScreenPtr pScreen = pPicture->pDrawable->pScreen;
     PictureScreenPtr ps = GetPictureScreen(pScreen);
-    void *clientClip;
-    int clientClipType;
+    RegionPtr clientClip;
 
     switch (type) {
     case CT_PIXMAP:
         /* convert the pixmap to a region */
-        clientClip = (void *) BitmapToRegion(pScreen, (PixmapPtr) value);
+        clientClip = BitmapToRegion(pScreen, (PixmapPtr) value);
         if (!clientClip)
             return BadAlloc;
-        clientClipType = CT_REGION;
         (*pScreen->DestroyPixmap) ((PixmapPtr) value);
         break;
     case CT_REGION:
         clientClip = value;
-        clientClipType = CT_REGION;
         break;
     case CT_NONE:
         clientClip = 0;
-        clientClipType = CT_NONE;
         break;
     default:
-        clientClip = (void *) RegionFromRects(n, (xRectangle *) value, type);
+        clientClip = RegionFromRects(n, (xRectangle *) value, type);
         if (!clientClip)
             return BadAlloc;
-        clientClipType = CT_REGION;
         free(value);
         break;
     }
     (*ps->DestroyPictureClip) (pPicture);
     pPicture->clientClip = clientClip;
-    pPicture->clientClipType = clientClipType;
     pPicture->stateChanges |= CPClipMask;
     return Success;
 }
@@ -144,7 +124,7 @@ miValidatePicture(PicturePtr pPicture, Mask mask)
              * copying of regions.  (this wins especially if many clients clip
              * by children and have no client clip.)
              */
-            if (pPicture->clientClipType == CT_NONE) {
+            if (!pPicture->clientClip) {
                 if (freeCompClip)
                     RegionDestroy(pPicture->pCompositeClip);
                 pPicture->pCompositeClip = pregWin;
@@ -203,7 +183,7 @@ miValidatePicture(PicturePtr pPicture, Mask mask)
                 pPicture->pCompositeClip = RegionCreate(&pixbounds, 1);
             }
 
-            if (pPicture->clientClipType == CT_REGION) {
+            if (pPicture->clientClip) {
                 if (pDrawable->x || pDrawable->y) {
                     RegionTranslate(pPicture->clientClip,
                                     pDrawable->x + pPicture->clipOrigin.x,
@@ -284,7 +264,7 @@ miClipPictureReg(pixman_region16_t * pRegion,
 static inline Bool
 miClipPictureSrc(RegionPtr pRegion, PicturePtr pPicture, int dx, int dy)
 {
-    if (pPicture->clientClipType != CT_NONE) {
+    if (pPicture->clientClip) {
         Bool result;
 
         pixman_region_translate(pPicture->clientClip,