1 files changed, 51 insertions, 10 deletions

diff --git a/src/gallium/winsys/xlib/xm_winsys.c b/src/gallium/winsys/xlib/xm_winsys.c
index 68ead7f528..c4a30d3702 100644
--- a/src/gallium/winsys/xlib/xm_winsys.c
+++ b/src/gallium/winsys/xlib/xm_winsys.c
@@ -276,6 +276,39 @@ xm_buffer_destroy(struct pipe_winsys *pws,
 
 
 /**
+ * For Cell.  Basically, rearrange the pixels/quads from this layout:
+ *  +--+--+--+--+
+ *  |p0|p1|p2|p3|....
+ *  +--+--+--+--+
+ *
+ * to this layout:
+ *  +--+--+
+ *  |p0|p1|....
+ *  +--+--+
+ *  |p2|p3|
+ *  +--+--+
+ */
+static void
+twiddle_tile(uint *tile)
+{
+   uint tile2[TILE_SIZE * TILE_SIZE];
+   int y, x;
+
+   for (y = 0; y < TILE_SIZE; y+=2) {
+      for (x = 0; x < TILE_SIZE; x+=2) {
+         int k = 4 * (y/2 * TILE_SIZE/2 + x/2);
+         tile2[y * TILE_SIZE + (x + 0)] = tile[k];
+         tile2[y * TILE_SIZE + (x + 1)] = tile[k+1];
+         tile2[(y + 1) * TILE_SIZE + (x + 0)] = tile[k+2];
+         tile2[(y + 1) * TILE_SIZE + (x + 1)] = tile[k+3];
+      }
+   }
+   memcpy(tile, tile2, sizeof(tile2));
+}
+
+
+
+/**
  * Display a surface that's in a tiled configuration.  That is, all the
  * pixels for a TILE_SIZExTILE_SIZE block are contiguous in memory.
  */
@@ -287,16 +320,16 @@ xmesa_display_surface_tiled(XMesaBuffer b, const struct pipe_surface *surf)
    const uint tilesPerRow = (surf->width + TILE_SIZE - 1) / TILE_SIZE;
    uint x, y;
 
-   /* check that the XImage has been previously initialized */
-   assert(ximage->format);
-   assert(ximage->bitmap_unit);
-
    if (XSHM_ENABLED(xm_buf) && (xm_buf->tempImage == NULL)) {
       alloc_shm_ximage(xm_buf, b, TILE_SIZE, TILE_SIZE);
    }
 
    ximage = (XSHM_ENABLED(xm_buf)) ? xm_buf->tempImage : b->tempImage;
 
+   /* check that the XImage has been previously initialized */
+   assert(ximage->format);
+   assert(ximage->bitmap_unit);
+
    if (!XSHM_ENABLED(xm_buf)) {
       /* update XImage's fields */
       ximage->width = TILE_SIZE;
@@ -306,24 +339,32 @@ xmesa_display_surface_tiled(XMesaBuffer b, const struct pipe_surface *surf)
 
    for (y = 0; y < surf->height; y += TILE_SIZE) {
       for (x = 0; x < surf->width; x += TILE_SIZE) {
-         int dx = x;
-         int dy = y;
          int tx = x / TILE_SIZE;
          int ty = y / TILE_SIZE;
          int offset = ty * tilesPerRow + tx;
+         int w = TILE_SIZE;
+         int h = TILE_SIZE;
+
+         if (y + h > surf->height)
+            h = surf->height - y;
+         if (x + w > surf->width)
+            w = surf->width - x;
 
          offset *= 4 * TILE_SIZE * TILE_SIZE;
 
          ximage->data = (char *) xm_buf->data + offset;
 
+         twiddle_tile((uint *) ximage->data);
+
          if (XSHM_ENABLED(xm_buf)) {
 #if defined(USE_XSHM) && !defined(XFree86Server)
             XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
-                         ximage, 0, 0, x, y, TILE_SIZE, TILE_SIZE, False);
+                         ximage, 0, 0, x, y, w, h, False);
 #endif
-         } else {
+         }
+         else {
             XPutImage(b->xm_visual->display, b->drawable, b->gc,
-                      ximage, 0, 0, dx, dy, TILE_SIZE, TILE_SIZE);
+                      ximage, 0, 0, x, y, w, h);
          }
       }
    }
@@ -543,7 +584,7 @@ xm_surface_release(struct pipe_winsys *winsys, struct pipe_surface **s)
    surf->refcount--;
    if (surf->refcount == 0) {
       if (surf->buffer)
-	pipe_buffer_reference(winsys, &surf->buffer, NULL);
+	winsys_buffer_reference(winsys, &surf->buffer, NULL);
       free(surf);
    }
    *s = NULL;