[PATCH xserver] glamor: Clarify variable names in glamor_copy_cpu_fbo

[Keith Packard]

This function creates a temporary pixmap to hold data being moved from
the source to the destination. However, it labeled all of the
variables associated with this as src_, which makes it confusing to
read the code. Rename them tmp_ instead. Also fix the comment
describing the function to note that it copies from CPU to GPU, not
GPU to GPU.

Signed-off-by: Keith Packard <keithp at keithp.com>
---
 glamor/glamor_copy.c | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/glamor/glamor_copy.c b/glamor/glamor_copy.c
index ff8f44ef1..b13f11d42 100644
--- a/glamor/glamor_copy.c
+++ b/glamor/glamor_copy.c
@@ -180,7 +180,7 @@ glamor_copy_bail(DrawablePtr src,
 }
 
 /**
- * Implements CopyPlane and CopyArea from the GPU to the GPU by using
+ * Implements CopyPlane and CopyArea from the CPU to the GPU by using
  * the source as a texture and painting that into the destination.
  *
  * This requires that source and dest are different textures, or that
@@ -203,10 +203,6 @@ glamor_copy_cpu_fbo(DrawablePtr src,
     ScreenPtr screen = dst->pScreen;
     glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
     PixmapPtr dst_pixmap = glamor_get_drawable_pixmap(dst);
-    FbBits *src_bits;
-    FbStride src_stride;
-    int src_bpp;
-    int src_xoff, src_yoff;
     int dst_xoff, dst_yoff;
 
     if (gc && gc->alu != GXcopy)
@@ -221,33 +217,43 @@ glamor_copy_cpu_fbo(DrawablePtr src,
     glamor_get_drawable_deltas(dst, dst_pixmap, &dst_xoff, &dst_yoff);
 
     if (bitplane) {
-        PixmapPtr src_pix = fbCreatePixmap(screen, dst_pixmap->drawable.width,
+        FbBits *tmp_bits;
+        FbStride tmp_stride;
+        int tmp_bpp;
+        int tmp_xoff, tmp_yoff;
+
+        PixmapPtr tmp_pix = fbCreatePixmap(screen, dst_pixmap->drawable.width,
                                            dst_pixmap->drawable.height,
                                            dst->depth, 0);
 
-        if (!src_pix) {
+        if (!tmp_pix) {
             glamor_finish_access(src);
             goto bail;
         }
 
-        src_pix->drawable.x = -dst->x;
-        src_pix->drawable.y = -dst->y;
+        tmp_pix->drawable.x = -dst->x;
+        tmp_pix->drawable.y = -dst->y;
 
-        fbGetDrawable(&src_pix->drawable, src_bits, src_stride, src_bpp, src_xoff,
-                      src_yoff);
+        fbGetDrawable(&tmp_pix->drawable, tmp_bits, tmp_stride, tmp_bpp, tmp_xoff,
+                      tmp_yoff);
 
         if (src->bitsPerPixel > 1)
-            fbCopyNto1(src, &src_pix->drawable, gc, box, nbox, dx, dy,
+            fbCopyNto1(src, &tmp_pix->drawable, gc, box, nbox, dx, dy,
                        reverse, upsidedown, bitplane, closure);
         else
-            fbCopy1toN(src, &src_pix->drawable, gc, box, nbox, dx, dy,
+            fbCopy1toN(src, &tmp_pix->drawable, gc, box, nbox, dx, dy,
                        reverse, upsidedown, bitplane, closure);
 
-        glamor_upload_boxes(dst_pixmap, box, nbox, src_xoff, src_yoff,
-                            dst_xoff, dst_yoff, (uint8_t *) src_bits,
-                            src_stride * sizeof(FbBits));
-        fbDestroyPixmap(src_pix);
+        glamor_upload_boxes(dst_pixmap, box, nbox, tmp_xoff, tmp_yoff,
+                            dst_xoff, dst_yoff, (uint8_t *) tmp_bits,
+                            tmp_stride * sizeof(FbBits));
+        fbDestroyPixmap(tmp_pix);
     } else {
+        FbBits *src_bits;
+        FbStride src_stride;
+        int src_bpp;
+        int src_xoff, src_yoff;
+
         fbGetDrawable(src, src_bits, src_stride, src_bpp, src_xoff, src_yoff);
         glamor_upload_boxes(dst_pixmap, box, nbox, src_xoff + dx, src_yoff + dy,
                             dst_xoff, dst_yoff,
-- 
2.11.0