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* Copyright 2014 Google Inc. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "base/compiler_specific.h"
#include "cobalt/base/type_id.h"
#include "cobalt/math/matrix3_f.h"
#include "cobalt/math/rect_f.h"
#include "cobalt/render_tree/image.h"
#include "cobalt/render_tree/node.h"
namespace cobalt {
namespace render_tree {
// An image that supports scaling and tiling.
class ImageNode : public Node {
struct Builder {
Builder(const scoped_refptr<Image>& source,
const math::RectF& destination_rect);
Builder(const scoped_refptr<Image>& source, const math::Vector2dF& offset);
Builder(const scoped_refptr<Image>& source,
const math::RectF& destination_rect,
const math::Matrix3F& local_transform);
// A source of pixels. May be smaller or larger than layed out image.
// The class does not own the image, it merely refers it from a resource
// pool.
scoped_refptr<Image> source;
// The destination rectangle into which the image will be rasterized.
math::RectF destination_rect;
// A matrix expressing how the each point within the image box (defined
// by destination_rect) should be mapped to image data. The identity
// matrix would map the entire source image rectangle into the entire
// destination rectangle. As an example, if you were to pass in a scale
// matrix that scales the image coordinates by 0.5 in all directions, the
// image will appear zoomed out.
math::Matrix3F local_transform;
explicit ImageNode(const Builder& builder) : data_(builder) {}
// If no width/height are specified, the native width and height of the
// image will be selected and used as the image node's width and height.
explicit ImageNode(const scoped_refptr<Image>& source);
// The specified image will render with the given width and height, which
// may result in scaling.
ImageNode(const scoped_refptr<Image>& image,
const math::RectF& destination_rect);
ImageNode(const scoped_refptr<Image>& image, const math::Vector2dF& offset);
// Allows users to additionally supply a local matrix to be applied to the
// normalized image coordinates.
ImageNode(const scoped_refptr<Image>& image,
const math::RectF& destination_rect,
const math::Matrix3F& local_transform);
void Accept(NodeVisitor* visitor) OVERRIDE;
math::RectF GetBounds() const OVERRIDE;
base::TypeId GetTypeId() const OVERRIDE {
return base::GetTypeId<ImageNode>();
const Builder& data() const { return data_; }
const Builder data_;
} // namespace render_tree
} // namespace cobalt