68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
#pragma once
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#include <mbgl/util/noncopyable.hpp>
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#include <mbgl/util/size.hpp>
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#include <string>
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#include <memory>
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#include <algorithm>
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namespace mbgl {
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enum class ImageAlphaMode {
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Unassociated,
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Premultiplied,
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Exclusive, // Alpha-channel only
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};
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template <ImageAlphaMode Mode>
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class Image : private util::noncopyable {
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public:
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Image() = default;
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Image(Size size_)
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: size(std::move(size_)),
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data(std::make_unique<uint8_t[]>(bytes())) {}
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Image(Size size_, std::unique_ptr<uint8_t[]> data_)
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: size(std::move(size_)),
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data(std::move(data_)) {}
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Image(Image&& o)
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: size(o.size),
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data(std::move(o.data)) {}
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Image& operator=(Image&& o) {
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size = o.size;
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data = std::move(o.data);
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return *this;
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}
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bool operator==(const Image& rhs) const {
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return size == rhs.size &&
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std::equal(data.get(), data.get() + bytes(), rhs.data.get(),
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rhs.data.get() + rhs.bytes());
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}
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bool valid() const {
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return size && data.get() != nullptr;
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}
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size_t stride() const { return channels * size.width; }
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size_t bytes() const { return stride() * size.height; }
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Size size;
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static constexpr size_t channels = Mode == ImageAlphaMode::Exclusive ? 1 : 4;
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std::unique_ptr<uint8_t[]> data;
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};
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using UnassociatedImage = Image<ImageAlphaMode::Unassociated>;
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using PremultipliedImage = Image<ImageAlphaMode::Premultiplied>;
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using AlphaImage = Image<ImageAlphaMode::Exclusive>;
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// TODO: don't use std::string for binary data.
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PremultipliedImage decodeImage(const std::string&);
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std::string encodePNG(const PremultipliedImage&);
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} // namespace mbgl
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