Fix low-res tiles rendering too early

bug:5369978

Low-res tiles were being prepared before high res, so despite being lower
priority, they had a chance to start rendering when a new page was loaded before
any other tiles existed in the priority queue.

Change-Id: I479f01a00c2507bcabf13929eb099571d8886c4c

1 files changed, 7 insertions, 7 deletions

diff --git a/Source/WebCore/platform/graphics/android/BaseLayerAndroid.cpp b/Source/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
index 547ac39..94bf045 100644
--- a/Source/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
+++ b/Source/WebCore/platform/graphics/android/BaseLayerAndroid.cpp
@@ -232,13 +232,6 @@ bool BaseLayerAndroid::drawBasePictureInGL(SkRect& viewport, float scale,
     bool scrolling = m_scrollState != NotScrolling;
     bool zooming = ZoomManager::kNoScaleRequest != zoomManager->scaleRequestState();
 
-    // prefetch in the nextTiledPage if unused by zooming (even if not scrolling
-    // since we want the tiles to be ready before they're needed)
-    bool usePrefetchPage = !zooming;
-    nextTiledPage->setIsPrefetchPage(usePrefetchPage);
-    if (usePrefetchPage)
-        prefetchBasePicture(viewport, scale, nextTiledPage);
-
     // When we aren't zooming, we should TRY and swap tile buffers if they're
     // ready. When scrolling, we swap whatever's ready. Otherwise, buffer until
     // the entire page is ready and then swap.
@@ -293,6 +286,13 @@ bool BaseLayerAndroid::drawBasePictureInGL(SkRect& viewport, float scale,
     XLOG("scrolling %d, zooming %d, buffersSwapped %d, needsRedraw %d",
          scrolling, zooming, buffersSwapped, needsRedraw);
 
+    // prefetch in the nextTiledPage if unused by zooming (even if not scrolling
+    // since we want the tiles to be ready before they're needed)
+    bool usePrefetchPage = !zooming;
+    nextTiledPage->setIsPrefetchPage(usePrefetchPage);
+    if (usePrefetchPage)
+        prefetchBasePicture(viewport, scale, nextTiledPage);
+
     tiledPage->draw(transparency, preZoomBounds);
 
     return needsRedraw;