Bug 931843 - Part 1: generate smaller thumbnails. r=kats

mobile/android/base/ThumbnailHelper.java

@@ -96,18 +96,24 @@ public final class ThumbnailHelper {
     }
 
     public void setThumbnailWidth(int width) {
-        mPendingWidth.set(IntSize.nextPowerOfTwo(width));
+        // Check inverted for safety: Bug 803299 Comment 34.
+        if (GeckoAppShell.getScreenDepth() == 24) {
+            mPendingWidth.set(width);
+        } else {
+            // Bug 776906: on 16-bit screens we need to ensure an even width.
+            mPendingWidth.set((width & 1) == 0 ? width : width + 1);
+        }
     }
 
     private void updateThumbnailSize() {
-        // Apply any pending width updates
+        // Apply any pending width updates.
         mWidth = mPendingWidth.get();
 
-        mWidth &= ~0x1; // Ensure the width is always an even number (bug 776906)
         mHeight = Math.round(mWidth * THUMBNAIL_ASPECT_RATIO);
 
         int pixelSize = (GeckoAppShell.getScreenDepth() == 24) ? 4 : 2;
         int capacity = mWidth * mHeight * pixelSize;
+        Log.d(LOGTAG, "Using new thumbnail size: " + capacity + " (width " + mWidth + ")");
         if (mBuffer == null || mBuffer.capacity() != capacity) {
             if (mBuffer != null) {
                 mBuffer = DirectBufferAllocator.free(mBuffer);
@@ -139,6 +145,7 @@ public final class ThumbnailHelper {
             return;
         }
 
+        Log.d(LOGTAG, "Sending thumbnail event: " + mWidth + ", " + mHeight);
         GeckoEvent e = GeckoEvent.createThumbnailEvent(tab.getId(), mWidth, mHeight, mBuffer);
         GeckoAppShell.sendEventToGecko(e);
     }
@@ -172,6 +179,7 @@ public final class ThumbnailHelper {
     }
 
     private void handleThumbnailData(Tab tab, ByteBuffer data) {
+        Log.d(LOGTAG, "handleThumbnailData: " + data.capacity());
         if (data != mBuffer) {
             // This should never happen, but log it and recover gracefully
             Log.e(LOGTAG, "handleThumbnailData called with an unexpected ByteBuffer!");

mobile/android/base/home/TopSitesGridView.java

@@ -18,6 +18,7 @@ import android.database.Cursor;
 import android.graphics.Rect;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.view.ContextMenu.ContextMenuInfo;
 import android.view.View;
 import android.widget.AbsListView;
@@ -179,13 +180,10 @@ public class TopSitesGridView extends GridView {
             return;
         }
 
-        final int childWidth = getColumnWidth();
+        final int columnWidth = getColumnWidth();
-
-        // Set the column width as the thumbnail width.
-        ThumbnailHelper.getInstance().setThumbnailWidth(childWidth);
 
         // Get the first child from the adapter.
-        final View child = new TopSitesGridItemView(getContext());
+        final TopSitesGridItemView child = new TopSitesGridItemView(getContext());
 
         // Set a default LayoutParams on the child, if it doesn't have one on its own.
         AbsListView.LayoutParams params = (AbsListView.LayoutParams) child.getLayoutParams();
@@ -197,11 +195,16 @@ public class TopSitesGridView extends GridView {
 
         // Measure the exact width of the child, and the height based on the width.
         // Note: the child (and TopSitesThumbnailView) takes care of calculating its height.
-        int childWidthSpec = MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY);
+        int childWidthSpec = MeasureSpec.makeMeasureSpec(columnWidth, MeasureSpec.EXACTLY);
         int childHeightSpec = MeasureSpec.makeMeasureSpec(0,  MeasureSpec.UNSPECIFIED);
         child.measure(childWidthSpec, childHeightSpec);
         final int childHeight = child.getMeasuredHeight();
 
+        // This is the maximum width of the contents of each child in the grid.
+        // Use this as the target width for thumbnails.
+        final int thumbnailWidth = child.getMeasuredWidth() - child.getPaddingLeft() - child.getPaddingRight();
+        ThumbnailHelper.getInstance().setThumbnailWidth(thumbnailWidth);
+
         // Number of rows required to show these top sites.
         final int rows = (int) Math.ceil((double) mMaxSites / mNumColumns);
         final int childrenHeight = childHeight * rows;