My attempt at a smarter tile manager

 Removes TileSets and queues tiles individually
 Uses a priority queue to determine which tiles to render first
 Stops rendering the front tile page if we are prepping the back one
 Limits queue spam by tracking which tiles are already in the queue

Change-Id: I2f2c9539e0d8a421ac7f1f4cb80ee831b9894293

1 files changed, 81 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/android/PaintTileOperation.cpp b/WebCore/platform/graphics/android/PaintTileOperation.cpp
new file mode 100644
index 0000000..222b69b
--- /dev/null
+++ b/WebCore/platform/graphics/android/PaintTileOperation.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2011, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "PaintTileOperation.h"
+
+namespace WebCore {
+
+PaintTileOperation::PaintTileOperation(BaseTile* tile)
+    : QueuedOperation(QueuedOperation::PaintTile, tile->page())
+    , m_tile(tile)
+{
+    if (m_tile)
+        m_tile->setRepaintPending(true);
+}
+
+PaintTileOperation::~PaintTileOperation()
+{
+    if (m_tile) {
+        m_tile->setRepaintPending(false);
+        m_tile = 0;
+    }
+}
+
+bool PaintTileOperation::operator==(const QueuedOperation* operation)
+{
+    if (operation->type() != type())
+        return false;
+    const PaintTileOperation* op = static_cast<const PaintTileOperation*>(operation);
+    return op->m_tile == m_tile;
+}
+
+void PaintTileOperation::run()
+{
+    if (m_tile) {
+        m_tile->paintBitmap();
+        m_tile->setRepaintPending(false);
+        m_tile = 0;
+    }
+}
+
+int PaintTileOperation::priority()
+{
+    if (!m_tile || m_tile->usedLevel() < 0)
+        return -1;
+    bool goingDown = m_tile->page()->scrollingDown();
+    SkIRect *rect = m_tile->page()->expandedTileBounds();
+    int firstTileX = rect->fLeft;
+    int nbTilesWidth = rect->width();
+    int priority = m_tile->x() - firstTileX;
+    if (goingDown)
+        priority += (rect->fBottom - m_tile->y()) * nbTilesWidth;
+    else
+        priority += (m_tile->y() - rect->fTop) * nbTilesWidth;
+    priority += m_tile->usedLevel() * 100000;
+    return priority;
+}
+
+}