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// Copyright 2017 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_RENDERER_RASTERIZER_EGL_DRAW_RECT_LINEAR_GRADIENT_H_
#define COBALT_RENDERER_RASTERIZER_EGL_DRAW_RECT_LINEAR_GRADIENT_H_
#include <vector>
#include "cobalt/math/matrix3_f.h"
#include "cobalt/math/rect_f.h"
#include "cobalt/render_tree/brush.h"
#include "cobalt/renderer/rasterizer/egl/draw_object.h"
namespace cobalt {
namespace renderer {
namespace rasterizer {
namespace egl {
// Handles drawing a rectangle with a linear color gradient. This may use
// transparency to mask out unwanted pixels, so it must be processed with other
// transparent draws.
class DrawRectLinearGradient : public DrawObject {
public:
DrawRectLinearGradient(GraphicsState* graphics_state,
const BaseState& base_state, const math::RectF& rect,
const render_tree::LinearGradientBrush& brush);
void ExecuteUpdateVertexBuffer(
GraphicsState* graphics_state,
ShaderProgramManager* program_manager) override;
void ExecuteRasterize(GraphicsState* graphics_state,
ShaderProgramManager* program_manager) override;
base::TypeId GetTypeId() const override;
private:
void AddRectWithHorizontalGradient(
const math::RectF& rect, const math::PointF& source,
const math::PointF& dest, const render_tree::ColorStopList& color_stops);
void AddRectWithVerticalGradient(
const math::RectF& rect, const math::PointF& source,
const math::PointF& dest, const render_tree::ColorStopList& color_stops);
void AddRectWithAngledGradient(const math::RectF& rect,
const render_tree::LinearGradientBrush& brush);
uint32_t GetGLColor(const render_tree::ColorStop& color_stop);
void AddVertex(float x, float y, uint32_t color);
// For angled gradients, this is the rotation needed to transform a
// horizontal gradient into the desired rect with angled gradient. The
// include scissor will be used to ensure that only the desired pixels
// are modified.
math::Matrix3F transform_;
math::RectF include_scissor_;
struct VertexAttributes {
float position[2];
float offset[2];
uint32_t color;
};
std::vector<VertexAttributes> attributes_;
uint8_t* vertex_buffer_;
};
} // namespace egl
} // namespace rasterizer
} // namespace renderer
} // namespace cobalt
#endif // COBALT_RENDERER_RASTERIZER_EGL_DRAW_RECT_LINEAR_GRADIENT_H_