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feat(jpegenc): honor the encode restart interval

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Co-Authored-By: Claude <noreply@anthropic.com>
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Adrià FranchandClaude committed 2026-10-06 14:16:07 +02:00
1 parent 5895ea721a
commit 263cb6626c
6 files changed
+99 -5
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core/Decoder/Jpeg/src/Jpeg.cpp
+9 -1
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@@ -49,7 +49,8 @@ int toSubsampling(Sampling sampling) {
} // namespace
std::vector<std::uint8_t> Encode(std::span<const std::uint8_t> pixels, std::uint32_t width, std::uint32_t height,
std::uint32_t channels, int quality, Sampling sampling) {
std::uint32_t channels, int quality, Sampling sampling, std::uint32_t restartBlocks,
std::uint32_t restartRows) {
if (width == 0 || height == 0 || width > MAX_DIMENSION || height > MAX_DIMENSION) {
throw std::invalid_argument("Jpeg::Encode: unsupported image size");
}
@@ -58,11 +59,18 @@ std::vector<std::uint8_t> Encode(std::span<const std::uint8_t> pixels, std::uint
if (pixels.size() < static_cast<std::size_t>(width) * height * channels) {
throw std::invalid_argument("Jpeg::Encode: pixel buffer is too small");
}
if (restartBlocks > MAX_DIMENSION || restartRows > MAX_DIMENSION || (restartBlocks != 0 && restartRows != 0)) {
throw std::invalid_argument("Jpeg::Encode: invalid restart interval");
}
const int subsampling = toSubsampling(sampling);
Handle handle;
if (tj3Set(handle, TJPARAM_QUALITY, quality) < 0 || tj3Set(handle, TJPARAM_SUBSAMP, channels == 1 ? TJSAMP_GRAY : subsampling) < 0) {
throw std::runtime_error("Jpeg::Encode: encoder configuration failed");
}
if ((restartBlocks != 0 && tj3Set(handle, TJPARAM_RESTARTBLOCKS, static_cast<int>(restartBlocks)) < 0) ||
(restartRows != 0 && tj3Set(handle, TJPARAM_RESTARTROWS, static_cast<int>(restartRows)) < 0)) {
throw std::runtime_error("Jpeg::Encode: encoder configuration failed");
}
Buffer buffer;
std::size_t size = 0;
const int pixelFormat = channels == 1 ? TJPF_GRAY : TJPF_RGB;