47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#pragma once
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#include <easy2d/core/types.h>
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#include <easy2d/core/math_types.h>
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#include <vector>
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namespace easy2d {
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// ============================================================================
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// Alpha 遮罩 - 存储图片的非透明区域信息
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// ============================================================================
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class AlphaMask {
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public:
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AlphaMask() = default;
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AlphaMask(int width, int height);
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/// 从像素数据创建遮罩
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static AlphaMask createFromPixels(const uint8_t* pixels, int width, int height, int channels);
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/// 获取指定位置的透明度（0-255）
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uint8_t getAlpha(int x, int y) const;
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/// 检查指定位置是否不透明
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bool isOpaque(int x, int y, uint8_t threshold = 128) const;
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/// 检查指定位置是否在遮罩范围内
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bool isValid(int x, int y) const;
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/// 获取遮罩尺寸
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int getWidth() const { return width_; }
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int getHeight() const { return height_; }
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Size getSize() const { return Size(static_cast<float>(width_), static_cast<float>(height_)); }
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/// 获取原始数据
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const std::vector<uint8_t>& getData() const { return data_; }
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/// 检查遮罩是否有效
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bool isValid() const { return !data_.empty() && width_ > 0 && height_ > 0; }
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private:
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int width_ = 0;
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int height_ = 0;
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std::vector<uint8_t> data_; // Alpha值数组
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};
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} // namespace easy2d
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