113 lines
5.3 KiB
C++
113 lines
5.3 KiB
C++
#include "Decoder/Jpeg.hpp"
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#include <cstdint>
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#include <cstdlib>
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#include <stdexcept>
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#include <utility>
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#include <vector>
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static void Require(bool value) { if (!value) std::abort(); }
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template<typename TFunction>
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static bool ThrowsInvalidArgument(TFunction function) {
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try {
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function();
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} catch (const std::invalid_argument&) {
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return true;
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}
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return false;
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}
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static bool IsJpeg(const std::vector<std::uint8_t>& data) {
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return data.size() > 4 && data[0] == 0xFF && data[1] == 0xD8 && data[data.size() - 2] == 0xFF && data.back() == 0xD9;
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}
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static int Difference(std::uint8_t left, std::uint8_t right) {
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return left > right ? left - right : right - left;
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}
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struct FrameInfo { int components; std::uint8_t sampling; };
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static FrameInfo ReadFrame(const std::vector<std::uint8_t>& jpeg) {
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std::size_t offset = 2;
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while (offset + 3 < jpeg.size()) {
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Require(jpeg[offset++] == 0xFF);
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while (offset < jpeg.size() && jpeg[offset] == 0xFF) ++offset;
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Require(offset < jpeg.size());
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const std::uint8_t marker = jpeg[offset++];
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if (marker == 0xDA || marker == 0xD9) break;
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Require(offset + 1 < jpeg.size());
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const std::size_t length = (static_cast<std::size_t>(jpeg[offset]) << 8) | jpeg[offset + 1];
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Require(length >= 2 && offset + length <= jpeg.size());
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if (marker >= 0xC0 && marker <= 0xC3) return {jpeg[offset + 7], jpeg[offset + 9]};
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offset += length;
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}
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std::abort();
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}
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int main() {
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constexpr std::uint32_t width = 32;
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constexpr std::uint32_t height = 24;
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std::vector<std::uint8_t> rgb(width * height * 3);
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for (std::uint32_t y = 0; y < height; ++y) {
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for (std::uint32_t x = 0; x < width; ++x) {
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std::uint8_t* pixel = &rgb[(y * width + x) * 3];
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pixel[0] = static_cast<std::uint8_t>(x * 8);
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pixel[1] = static_cast<std::uint8_t>(y * 10);
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pixel[2] = 128;
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}
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}
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const std::vector<std::uint8_t> rgbJpeg = Decoder::Jpeg::Encode(rgb, width, height, 3, 90);
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Require(IsJpeg(rgbJpeg));
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Require(ReadFrame(rgbJpeg).components == 3 && ReadFrame(rgbJpeg).sampling == 0x11);
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const auto rgbImage = Decoder::Jpeg::Decode(rgbJpeg);
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Require(rgbImage.has_value());
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Require(rgbImage->width == width && rgbImage->height == height && rgbImage->channels == 3);
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Require(rgbImage->pixels.size() == rgb.size());
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long totalError = 0;
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for (std::size_t i = 0; i < rgb.size(); ++i) totalError += Difference(rgb[i], rgbImage->pixels[i]);
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Require(totalError / static_cast<long>(rgb.size()) < 4);
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std::vector<std::uint8_t> gray(width * height);
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for (std::uint32_t y = 0; y < height; ++y) {
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for (std::uint32_t x = 0; x < width; ++x) gray[y * width + x] = static_cast<std::uint8_t>((x + y) * 4);
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}
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const std::vector<std::uint8_t> grayJpeg = Decoder::Jpeg::Encode(gray, width, height, 1, 90);
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Require(IsJpeg(grayJpeg));
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Require(ReadFrame(grayJpeg).components == 1);
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const auto grayImage = Decoder::Jpeg::Decode(grayJpeg);
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Require(grayImage.has_value());
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Require(grayImage->width == width && grayImage->height == height);
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totalError = 0;
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for (std::size_t i = 0; i < gray.size(); ++i) totalError += Difference(gray[i], grayImage->pixels[i * grayImage->channels]);
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Require(totalError / static_cast<long>(gray.size()) < 4);
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 4, 90); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 0); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 101); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, 0, height, 3, 90); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, 0x10000, 1, 3, 90); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height + 1, 3, 90); }));
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for (const auto [sampling, factor] : {std::pair{Decoder::Jpeg::Sampling::Yuv444, std::uint8_t{0x11}},
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std::pair{Decoder::Jpeg::Sampling::Yuv422, std::uint8_t{0x21}},
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std::pair{Decoder::Jpeg::Sampling::Yuv420, std::uint8_t{0x22}}}) {
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const auto encoded = Decoder::Jpeg::Encode(rgb, 31, 23, 3, 1, sampling);
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Require(ReadFrame(encoded).components == 3 && ReadFrame(encoded).sampling == factor);
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const auto highQuality = Decoder::Jpeg::Encode(rgb, 31, 23, 3, 100, sampling);
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Require(ReadFrame(highQuality).components == 3 && ReadFrame(highQuality).sampling == factor);
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}
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 90, static_cast<Decoder::Jpeg::Sampling>(3)); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 90, Decoder::Jpeg::Sampling::Yuv444, 1, 1); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 90, Decoder::Jpeg::Sampling::Yuv444, 0x10000, 0); }));
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Require(ThrowsInvalidArgument([&] { Decoder::Jpeg::Encode(rgb, width, height, 3, 90, Decoder::Jpeg::Sampling::Yuv444, 0, 0x10000); }));
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Require(!Decoder::Jpeg::Decode({}).has_value());
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const std::vector<std::uint8_t> garbage{1, 2, 3, 4, 5, 6, 7, 8};
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Require(!Decoder::Jpeg::Decode(garbage).has_value());
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return 0;
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}
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