Take scale into account when greedily prefetching an entire layer

bug:5509149

Scale wasn't being taken into account when estimating layer tile consumption, so
zooming in on layer content could attempt to fetch and draw hundreds of layers
per tile, causing lots of missing content.

Change-Id: Ib26e203827ad93be12d29561b9d8094cb712f014

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/WebCore/platform/graphics/android/PaintedSurface.cpp b/Source/WebCore/platform/graphics/android/PaintedSurface.cpp
index 00129a0..8f78638 100644
--- a/Source/WebCore/platform/graphics/android/PaintedSurface.cpp
+++ b/Source/WebCore/platform/graphics/android/PaintedSurface.cpp
@@ -214,8 +214,8 @@ void PaintedSurface::computeVisibleArea() {
     if (!m_visibleArea.isEmpty()) {
         float tileWidth = TilesManager::instance()->layerTileWidth();
         float tileHeight = TilesManager::instance()->layerTileHeight();
-        int w = ceilf(m_area.width() / tileWidth);
-        int h = ceilf(m_area.height() / tileHeight);
+        int w = ceilf(m_area.width() * m_scale / tileWidth);
+        int h = ceilf(m_area.height() * m_scale / tileHeight);
         if (w * h < MAX_UNCLIPPED_AREA)
             m_visibleArea = m_area;
     }