libs/hwui/shader/SweepGradientShader.h

/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * 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.
 */

#pragma once

#include "Shader.h"
#include "SkShader.h"

namespace android::uirenderer {

/**
 * Shader implementation that renders a color ramp clockwise such that the start and end colors
 * are visible at 3 o'clock. This handles converting to either an SkShader or SkImageFilter
 */
class SweepGradientShader : public Shader {
public:
    SweepGradientShader(float x, float y, const std::vector<SkColor4f>& colors,
                        const sk_sp<SkColorSpace>& colorspace, const SkScalar pos[],
                        const uint32_t shaderFlags, const SkMatrix* matrix);
    virtual ~SweepGradientShader() override;

protected:
    virtual sk_sp<SkShader> makeSkShader() override;

private:
    sk_sp<SkShader> skShader;
};
}  // namespace android::uirenderer