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// Copyright 2015 The Cobalt Authors. 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 "cobalt/renderer/test/scenes/image_wrap_scene.h"
#include <cmath>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "cobalt/math/size_f.h"
#include "cobalt/math/transform_2d.h"
#include "cobalt/render_tree/color_rgba.h"
#include "cobalt/render_tree/composition_node.h"
#include "cobalt/render_tree/image_node.h"
#include "cobalt/render_tree/matrix_transform_node.h"
#include "cobalt/render_tree/rect_node.h"
#include "cobalt/render_tree/resource_provider.h"
#include "cobalt/renderer/test/png_utils/png_decode.h"
using cobalt::math::Matrix3F;
using cobalt::math::SizeF;
using cobalt::render_tree::animations::AnimateNode;
using cobalt::render_tree::animations::Animation;
using cobalt::render_tree::animations::AnimationList;
using cobalt::render_tree::CompositionNode;
using cobalt::render_tree::Image;
using cobalt::render_tree::ImageNode;
using cobalt::render_tree::MatrixTransformNode;
using cobalt::render_tree::Node;
using cobalt::render_tree::ResourceProvider;
using cobalt::renderer::test::png_utils::DecodePNGToRenderTreeImage;
namespace cobalt {
namespace renderer {
namespace test {
namespace scenes {
namespace {
void AnimateImage(base::TimeDelta start_time,
ImageNode::Builder* composition_node, base::TimeDelta time) {
float elapsed_time_in_seconds = (time - start_time).InSecondsF();
// Determine the scale of the local image transform, given the current
// time.
const float kScalePeriodInSeconds = 1.5f;
const float kScaleAmplitude = 0.4f;
const float kScalePhaseShift = 0.55f;
float scale =
kScalePhaseShift + kScaleAmplitude *
sin(2 * M_PI * elapsed_time_in_seconds / kScalePeriodInSeconds);
// Determine the rotation of the local transform given the current time.
const float kRotationPeriod = 3.0f;
float rotation = 2 * M_PI * elapsed_time_in_seconds / kRotationPeriod;
// Combine the scale and rotation together, translating to the center to
// use that as the origin.
composition_node->local_transform =
math::TranslateMatrix(0.5f, 0.5f) *
math::ScaleMatrix(scale) * math::RotateMatrix(rotation);
scoped_refptr<Image> GetTestImage(ResourceProvider* resource_provider) {
// Load a test image from disk.
base::FilePath data_directory;
CHECK(base::PathService::Get(base::DIR_TEST_DATA, &data_directory));
return DecodePNGToRenderTreeImage(
} // namespace
scoped_refptr<render_tree::Node> CreateImageWrapScene(
ResourceProvider* resource_provider, const math::SizeF& output_dimensions,
base::TimeDelta start_time) {
AnimateNode::Builder animations;
// Create an image node that will have its local_transform animated to
// demonstrate what local_transform allows one to do.
scoped_refptr<ImageNode> image_node(new ImageNode(
GetTestImage(resource_provider), math::RectF(output_dimensions)));
// Scale our image down to half the screen, and center it.
scoped_refptr<MatrixTransformNode> image_wrap_scene(new MatrixTransformNode(
image_node, math::ScaleMatrix(0.5f) *
math::TranslateMatrix(output_dimensions.width() / 2,
output_dimensions.height() / 2)));
animations.Add(image_node, base::Bind(&AnimateImage, start_time));
return new AnimateNode(animations, image_wrap_scene);
} // namespace scenes
} // namespace test
} // namespace renderer
} // namespace cobalt