# HG changeset patch
# User Chris Cannam
# Date 1467307271 -3600
# Node ID cbc7c8675706fb5d17e97f2d06e1cd4df899e476
# Parent  2e5945b87acaf342879808f87b77187a56627bb8
Comments

diff -r 2e5945b87aca -r cbc7c8675706 layer/Colour3DPlotRenderer.cpp
--- a/layer/Colour3DPlotRenderer.cpp	Thu Jun 30 16:28:32 2016 +0100
+++ b/layer/Colour3DPlotRenderer.cpp	Thu Jun 30 18:21:11 2016 +0100
@@ -74,9 +74,9 @@
             m_cache.scrollTo(startFrame);
 
             // if we are not time-constrained, then we want to paint
-            // the whole area in one go, and we're not going to
-            // provide the more complex logic to handle that if there
-            // are discontiguous areas involved. So if the only valid
+            // the whole area in one go; we don't return a partial
+            // paint. To avoid providing the more complex logic to
+            // handle painting discontiguous areas, if the only valid
             // part of cache is in the middle, just make the whole
             // thing invalid and start again.
             if (!timeConstrained) {
@@ -91,10 +91,9 @@
     bool rightToLeft = false;
 
     if (!m_cache.isValid() && timeConstrained) {
-        // When rendering the whole thing in a context where we
-        // might not be able to complete the work, start from
-        // somewhere near the middle so that the region of
-        // interest appears first
+        // When rendering the whole area, in a context where we might
+        // not be able to complete the work, start from somewhere near
+        // the middle so that the region of interest appears first
 
         //!!! (perhaps we should avoid doing this if past repaints
         //!!! have been fast enough to do the whole in one shot)
diff -r 2e5945b87aca -r cbc7c8675706 layer/ScrollableImageCache.h
--- a/layer/ScrollableImageCache.h	Thu Jun 30 16:28:32 2016 +0100
+++ b/layer/ScrollableImageCache.h	Thu Jun 30 18:21:11 2016 +0100
@@ -122,10 +122,12 @@
      * Take a left coordinate and width describing a region, and
      * adjust them so that they are contiguous with the cache valid
      * region and so that the union of the adjusted region with the
-     * cache valid region contains the supplied region.
+     * cache valid region contains the supplied region.  Does not
+     * modify anything about the cache, only about the arguments.
      */
     void adjustToTouchValidArea(int &left, int &width,
 				bool &isLeftOfValidArea) const;
+    
     /**
      * Draw from an image onto the cache. The supplied image must have
      * the same height as the cache and the full height is always