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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/marquee_scene.h"
#include <memory>
#include <string>
#include "base/bind.h"
#include "cobalt/math/size_f.h"
#include "cobalt/math/transform_2d.h"
#include "cobalt/render_tree/composition_node.h"
#include "cobalt/render_tree/font.h"
#include "cobalt/render_tree/glyph_buffer.h"
#include "cobalt/render_tree/matrix_transform_node.h"
#include "cobalt/render_tree/rect_node.h"
#include "cobalt/render_tree/text_node.h"
#include "cobalt/render_tree/typeface.h"
using cobalt::math::Matrix3F;
using cobalt::math::RectF;
using cobalt::math::SizeF;
using cobalt::math::TranslateMatrix;
using cobalt::render_tree::animations::AnimateNode;
using cobalt::render_tree::animations::Animation;
using cobalt::render_tree::animations::AnimationList;
using cobalt::render_tree::Brush;
using cobalt::render_tree::ColorRGBA;
using cobalt::render_tree::CompositionNode;
using cobalt::render_tree::Font;
using cobalt::render_tree::FontStyle;
using cobalt::render_tree::GlyphBuffer;
using cobalt::render_tree::MatrixTransformNode;
using cobalt::render_tree::Node;
using cobalt::render_tree::RectNode;
using cobalt::render_tree::ResourceProvider;
using cobalt::render_tree::SolidColorBrush;
using cobalt::render_tree::TextNode;
namespace cobalt {
namespace renderer {
namespace test {
namespace scenes {
namespace {
scoped_refptr<GlyphBuffer> CreateGlyphBuffer(
ResourceProvider* resource_provider, FontStyle font_style, int font_size,
const std::string& text) {
scoped_refptr<Font> font =
resource_provider->GetLocalTypeface("Roboto", font_style)
return resource_provider->CreateGlyphBuffer(text, font);
void AnimateMarqueeElement(base::TimeDelta start_time, const RectF& text_bounds,
const SizeF& output_dimensions,
MatrixTransformNode::Builder* transform_node,
base::TimeDelta time) {
// Calculate the animated x position of the text.
const float kTextMarqueePeriod = 10.0f;
float text_start_position = -text_bounds.right();
float text_end_position = output_dimensions.width() - text_bounds.x();
float periodic_position =
Sawtooth((time - start_time).InSecondsF() / kTextMarqueePeriod);
float x_position =
text_start_position +
(text_end_position - text_start_position) * periodic_position;
// Translate the specified child element by the appropriate amount.
transform_node->transform = TranslateMatrix(x_position, 0);
} // namespace
scoped_refptr<render_tree::Node> CreateMarqueeScene(
ResourceProvider* resource_provider, const math::SizeF& output_dimensions,
base::TimeDelta start_time) {
CompositionNode::Builder marquee_scene_builder;
AnimateNode::Builder animations;
const std::string kMarqueeText("YouTube");
// All animations will affect the top-level composition node, and so they
// will all go in this same list.
AnimationList<CompositionNode>::Builder marquee_animations;
// Load a font for use with text rendering.
const float kFontSize = 40.0f;
scoped_refptr<render_tree::GlyphBuffer> glyph_buffer = CreateGlyphBuffer(
resource_provider, FontStyle(), kFontSize, kMarqueeText);
RectF text_bounds(glyph_buffer->GetBounds());
// Use information about the string we are rendering to properly position
// it in the vertical center of the screen and far enough offscreen that
// a switch from the right side to the left is not noticed.
// Center the text's bounding box vertically on the screen.
float y_position =
(output_dimensions.height() / 2.0f) - text_bounds.y() -
(text_bounds.height() / 2.0f);
// Add a background rectangle to the text in order to demonstrate the
// relationship between the text's origin and its bounding box.
new RectNode(RectF(text_bounds.x(), y_position + text_bounds.y(),
text_bounds.width(), text_bounds.height()),
new SolidColorBrush(ColorRGBA(0.7f, 0.2f, 1.0f))))));
// Add the actual text node to our composition.
marquee_scene_builder.AddChild(new TextNode(math::Vector2dF(0, y_position),
ColorRGBA(0.0f, 0.0f, 0.0f)));
scoped_refptr<MatrixTransformNode> marquee_node(new MatrixTransformNode(
new CompositionNode(std::move(marquee_scene_builder)),
animations.Add(marquee_node, base::Bind(&AnimateMarqueeElement, start_time,
text_bounds, output_dimensions));
return new AnimateNode(animations, marquee_node);
} // namespace scenes
} // namespace test
} // namespace renderer
} // namespace cobalt