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DotDebianandClaude Opus 5.5
bfe9bf9af4
A filter_type naming a subset of the PNG filters used only the first filter of the mask, because stb's writer is either fully adaptive or forced to one filter. Decoder::Png::Encode now takes the set of allowed filter types, filters the rows and writes the chunks itself, and keeps stb for deflate only. Output for the all-filters and single-filter cases is unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
#ifndef DECODER_PNG_HPP
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#define DECODER_PNG_HPP
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#include <cstdint>
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#include <optional>
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#include <span>
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#include <vector>
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namespace Decoder::Png {
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enum class ColorType : std::uint8_t {
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Grayscale = 0,
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Rgb = 2,
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Palette = 3,
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GrayscaleAlpha = 4,
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Rgba = 6,
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};
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struct Header {
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std::uint32_t width;
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std::uint32_t height;
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std::uint8_t bitDepth;
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ColorType colorType;
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bool interlaced;
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bool hasTransparency;
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};
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struct Image {
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std::uint32_t width;
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std::uint32_t height;
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std::vector<std::uint8_t> pixels;
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};
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std::optional<Header> ParseHeader(std::span<const std::uint8_t> png);
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std::optional<Image> Decode(std::span<const std::uint8_t> png);
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inline constexpr std::uint8_t FILTER_NONE = 1 << 0;
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inline constexpr std::uint8_t FILTER_SUB = 1 << 1;
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inline constexpr std::uint8_t FILTER_UP = 1 << 2;
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inline constexpr std::uint8_t FILTER_AVERAGE = 1 << 3;
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inline constexpr std::uint8_t FILTER_PAETH = 1 << 4;
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inline constexpr std::uint8_t FILTER_ALL = FILTER_NONE | FILTER_SUB | FILTER_UP | FILTER_AVERAGE | FILTER_PAETH;
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struct EncodeOptions {
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int compressionLevel = 8;
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std::uint8_t filters = FILTER_ALL;
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};
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std::vector<std::uint8_t> Encode(std::span<const std::uint8_t> pixels, std::uint32_t width, std::uint32_t height,
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std::uint32_t channels, EncodeOptions options = {});
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} // namespace Decoder::Png
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#endif // DECODER_PNG_HPP
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