Rewrite PictureSet with TURBO!

This changes how partial invals are done by adding a hybrid mode.

What we used to do is generate a SkPicture for the new area. This
SkPicture would possibly be larger than the actual inval, depending
on various merge rules (more SkPictures == slower to draw a tile)

The new code rewrites PictureSet entirely, preserving many of the old rules
but cleans up the code and adds the concept of a "PrerenderedInval". This is
a partial inval that WebKit has rasterized. By having WebKit produce both
a SkPicture and a SkBitmap, we avoid needing to play back the picture and
avoid overdrawing. We take this SkBitmap, and simply update the front
textures with it. This gives us full partial invals through the entire
system without hitting any driver bugs, and with minimal copies. And while
the SkPicture may be larger than the inval, the SkBitmap that is rasterized
is not - it matches the area webkit has said is dirty.

Change-Id: Ieb7ecc9db0d4f679102fda004a43399f9b319ebc

1 files changed, 58 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/android/layers/PrerenderedInval.h b/Source/WebCore/platform/graphics/android/layers/PrerenderedInval.h
new file mode 100644
index 0000000..91f385d
--- /dev/null
+++ b/Source/WebCore/platform/graphics/android/layers/PrerenderedInval.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012, 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.
+ */
+
+#ifndef PrerenderedInval_h
+#define PrerenderedInval_h
+
+#include "IntRect.h"
+#include "SkBitmap.h"
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/ThreadSafeRefCounted.h>
+
+namespace WebCore {
+
+class PrerenderedInval : public ThreadSafeRefCounted<PrerenderedInval> {
+    WTF_MAKE_NONCOPYABLE(PrerenderedInval);
+public:
+    SkBitmap bitmap;
+    IntRect area;
+    IntRect screenArea;
+
+    static PassRefPtr<PrerenderedInval> create(const IntRect& ir)
+    {
+        return adoptRef(new PrerenderedInval(ir));
+    }
+
+private:
+    PrerenderedInval(const IntRect& ir)
+        : area(ir)
+    {}
+};
+
+} // namespace WebCore
+
+#endif // PrerenderedInval_h