78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <utils/Flattenable.h>
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#include "FloatRect.h"
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#include <math.h>
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#include <type_traits>
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namespace android {
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struct StretchEffect : public LightFlattenablePod<StretchEffect> {
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constexpr static const float CONTENT_DISTANCE_STRETCHED = 1.f;
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float width = 0;
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float height = 0;
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float vectorX = 0;
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float vectorY = 0;
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float maxAmountX = 0;
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float maxAmountY = 0;
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FloatRect mappedChildBounds = {0, 0, 0, 0};
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bool operator==(const StretchEffect& other) const {
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return width == other.width && height == other.height &&
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vectorX == other.vectorX &&
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vectorY == other.vectorY &&
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maxAmountX == other.maxAmountX &&
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maxAmountY == other.maxAmountY &&
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mappedChildBounds == other.mappedChildBounds;
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}
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bool operator!=(const StretchEffect& other) const { return !(*this == other); }
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static bool isZero(float value) {
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constexpr float NON_ZERO_EPSILON = 0.001f;
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return fabsf(value) <= NON_ZERO_EPSILON;
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}
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bool isNoOp() const { return isZero(vectorX) && isZero(vectorY); }
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bool hasEffect() const { return !isNoOp(); }
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void sanitize() {
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// If the area is empty, or the max amount is zero, then reset back to defaults
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if (width == 0.f || height == 0.f || isZero(maxAmountX) ||
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isZero(maxAmountY)) {
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*this = StretchEffect{};
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}
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}
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float getStretchWidthMultiplier() const {
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return CONTENT_DISTANCE_STRETCHED / (1.f + abs(vectorX));
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}
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float getStretchHeightMultiplier() const {
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return CONTENT_DISTANCE_STRETCHED / (1.f + abs(vectorY));
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}
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};
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static_assert(std::is_trivially_copyable<StretchEffect>::value,
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"StretchEffect must be trivially copyable to be flattenable");
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} // namespace android
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