c214a7a942
The JXL decoder now does colorspace conversion to sRGB correctly, independently of the color space that the JPEG XL file was in.
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
#include <emscripten/bind.h>
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#include <emscripten/val.h>
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#include "lib/jxl/enc_file.h"
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#include "lib/jxl/external_image.h"
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using namespace emscripten;
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thread_local const val Uint8Array = val::global("Uint8Array");
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struct JXLOptions {
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// 1 = slowest
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// 7 = fastest
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int speed;
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float quality;
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};
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val encode(std::string image, int width, int height, JXLOptions options) {
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jxl::CompressParams cparams;
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jxl::PassesEncoderState passes_enc_state;
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jxl::CodecInOut io;
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jxl::PaddedBytes bytes;
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jxl::ImageBundle* main = &io.Main();
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cparams.speed_tier = static_cast<jxl::SpeedTier>(options.speed);
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cparams.butteraugli_distance = options.quality;
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io.metadata.SetAlphaBits(8);
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uint8_t* inBuffer = (uint8_t*)image.c_str();
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auto result = jxl::ConvertImage(
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jxl::Span<const uint8_t>(reinterpret_cast<const uint8_t*>(image.data()), image.size()), width,
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height, jxl::ColorEncoding::SRGB(/*is_gray=*/false), /*has_alpha=*/true,
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/*alpha_is_premultiplied=*/false, /*bits_per_alpha=*/8, /*bits_per_sample=*/8,
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/*big_endian=*/false, /*flipped_y=*/false, /*pool=*/nullptr, main);
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if (!result) {
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return val::null();
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}
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auto js_result = val::null();
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if (EncodeFile(cparams, &io, &passes_enc_state, &bytes)) {
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js_result = Uint8Array.new_(typed_memory_view(bytes.size(), bytes.data()));
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}
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// TODO: Any freeing that needs to be done?
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//
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return js_result;
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}
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void free_result() {}
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EMSCRIPTEN_BINDINGS(my_module) {
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value_object<JXLOptions>("JXLOptions")
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.field("speed", &JXLOptions::speed)
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.field("quality", &JXLOptions::quality);
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function("encode", &encode);
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}
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