cc: Nine patch layer.

cc/nine_patch_layer.cc

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+
+#include "cc/nine_patch_layer.h"
+
+#include "cc/layer_tree_host.h"
+#include "cc/nine_patch_layer_impl.h"
+#include "cc/resource_update.h"
+#include "cc/resource_update_queue.h"
+
+namespace cc {
+
+scoped_refptr<NinePatchLayer> NinePatchLayer::create()
+{
+    return make_scoped_refptr(new NinePatchLayer());
+}
+
+NinePatchLayer::NinePatchLayer()
+    : m_bitmapDirty(false)
+{
+}
+
+NinePatchLayer::~NinePatchLayer()
+{
+}
+
+scoped_ptr<LayerImpl> NinePatchLayer::createLayerImpl()
+{
+    return NinePatchLayerImpl::create(id()).PassAs<LayerImpl>();
+}
+
+void NinePatchLayer::setTexturePriorities(const PriorityCalculator& priorityCalc)
+{
+    if (m_needsDisplay && m_bitmapDirty && drawsContent()) {
+        DCHECK(!m_bitmap.isNull());
+        createUpdaterIfNeeded();
+        m_updater->setBitmap(m_bitmap);
+        m_needsDisplay = false;
+
+        if (!m_resource.get())

[jamesr, 2012/11/01 19:55:43]

fyi - you can null check scoped_ptr<>s by just saying "if (!m_resource)", same
as with WTF smart pointers (thanks enne!)

+            m_resource = m_updater->createResource(layerTreeHost()->contentsTextureManager());
+    }
+
+    if (m_resource.get()) {
+        m_resource->texture()->setRequestPriority(PriorityCalculator::uiPriority(true));
+        // FIXME: Need to support swizzle in the shader for !PlatformColor::sameComponentOrder(textureFormat)
+        GLenum textureFormat = layerTreeHost()->rendererCapabilities().bestTextureFormat;
+        m_resource->texture()->setDimensions(IntSize(m_bitmap.width(), m_bitmap.height()), textureFormat);
+    }
+}
+
+void NinePatchLayer::setBitmap(const SkBitmap& bitmap, const IntRect& aperture) {
+    m_bitmap = bitmap;
+    m_imageAperture = aperture;
+    m_bitmapDirty = true;
+    setNeedsDisplay();
+}
+
+void NinePatchLayer::update(ResourceUpdateQueue& queue, const OcclusionTracker* occlusion, RenderingStats& stats)
+{
+    createUpdaterIfNeeded();
+
+    // FIXME: Or should this query backingResourceWasEvicted()?
+    if (m_resource.get() && (m_bitmapDirty || !m_resource->texture()->haveBackingTexture())) {
+        IntRect contentRect = IntRect(IntPoint(), IntSize(m_bitmap.width(), m_bitmap.height()));
+        ResourceUpdate upload = ResourceUpdate::Create(m_resource->texture(), &m_bitmap, contentRect, contentRect, gfx::Vector2d());
+        queue.appendFullUpload(upload);
+        m_bitmapDirty = false;
+    }
+}
+
+void NinePatchLayer::createUpdaterIfNeeded()
+{
+    if (m_updater)
+        return;
+
+    m_updater = ImageLayerUpdater::create();
+}
+
+bool NinePatchLayer::drawsContent() const
+{
+    bool draws = !m_bitmap.isNull() && Layer::drawsContent() && m_bitmap.width() && m_bitmap.height();
+    return draws;
+}
+
+void NinePatchLayer::pushPropertiesTo(LayerImpl* layer)
+{
+    Layer::pushPropertiesTo(layer);
+    NinePatchLayerImpl* layerImpl = static_cast<NinePatchLayerImpl*>(layer);
+
+    if (m_resource.get())

[jamesr, 2012/11/01 19:55:43]

does m_resource ever go null after creation? if it does, would we leave a stale
resource id on the layerImpl?

[aelias_OOO_until_Jul13, 2012/11/02 07:38:16]

No, it should never go null.  This is just in case this happens before it's
initialized.

[danakj, 2012/11/02 16:04:14]

Should we just DCHECK in setTexturePriorities() or update() or here also, that
m_bitmap and/or m_resource is not null?

Is it an intended use case that you would make this layer and not call setBitmap
on it immediately?

[aelias_OOO_until_Jul13, 2012/11/06 01:15:00]

Switched to DCHECKs.

+        layerImpl->setResourceId(m_resource->texture()->resourceId());
+    layerImpl->setNinePatchLayout(IntSize(m_bitmap.width(), m_bitmap.height()), m_imageAperture);
+}
+
+}