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c214a7a942
The JXL decoder now does colorspace conversion to sRGB correctly, independently of the color space that the JPEG XL file was in.
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
#include <emscripten/bind.h>
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#include <emscripten/val.h>
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#include <jxl/decode.h>
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#include "lib/jxl/color_encoding_internal.h"
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#include "skcms.h"
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using namespace emscripten;
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thread_local const val Uint8ClampedArray = val::global("Uint8ClampedArray");
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thread_local const val ImageData = val::global("ImageData");
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#define EXPECT_EQ(a, b) \
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if ((a) != (b)) { \
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JxlDecoderDestroy(dec); \
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return val::null(); \
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}
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val decode(std::string data) {
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JxlDecoder* dec = JxlDecoderCreate(nullptr);
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EXPECT_EQ(JXL_DEC_SUCCESS,
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JxlDecoderSubscribeEvents(
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dec, JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE));
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auto next_in = (const uint8_t*)data.c_str();
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auto avail_in = data.size();
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EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec, &next_in, &avail_in));
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size_t buffer_size;
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const JxlPixelFormat format = {4, JXL_LITTLE_ENDIAN, JXL_TYPE_FLOAT};
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EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
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JxlBasicInfo info;
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EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
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EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec, &next_in, &avail_in));
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size_t icc_size;
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EXPECT_EQ(JXL_DEC_SUCCESS,
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JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_DATA, &icc_size));
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std::vector<uint8_t> icc_profile(icc_size);
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EXPECT_EQ(JXL_DEC_SUCCESS,
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JxlDecoderGetColorAsICCProfile(dec, JXL_COLOR_PROFILE_TARGET_DATA, icc_profile.data(),
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icc_profile.size()));
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std::unique_ptr<float[]> float_pixels(new float[(buffer_size + 3) / 4]);
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EXPECT_EQ(JXL_DEC_SUCCESS,
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JxlDecoderSetImageOutBuffer(
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dec, &format, reinterpret_cast<uint8_t*>(float_pixels.get()), buffer_size));
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EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec, &next_in, &avail_in));
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JxlDecoderDestroy(dec);
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#undef EXPECT_EQ
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#define EXPECT_TRUE(a) \
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if (!(a)) { \
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return val::null(); \
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}
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std::unique_ptr<uint8_t[]> pixels(new uint8_t[info.xsize * info.ysize * 4]);
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// Convert to sRGB.
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skcms_ICCProfile jxl_profile;
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// If the image is encoded in its original color space, the decoded data will be in the color
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// space defined by the decoded ICC profile. Otherwise, it is in Linear sRGB. TODO: the decoded
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// color profile should also be Linear sRGB if !uses_original_profile.
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if (info.uses_original_profile) {
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EXPECT_TRUE(skcms_Parse(icc_profile.data(), icc_profile.size(), &jxl_profile));
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} else {
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auto s = jxl::ColorEncoding::LinearSRGB(/*gray=*/false);
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EXPECT_TRUE(s.CreateICC());
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EXPECT_TRUE(skcms_Parse(s.ICC().data(), s.ICC().size(), &jxl_profile));
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}
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EXPECT_TRUE(skcms_Transform(
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float_pixels.get(), skcms_PixelFormat_RGBA_ffff,
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info.alpha_premultiplied ? skcms_AlphaFormat_PremulAsEncoded : skcms_AlphaFormat_Unpremul,
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&jxl_profile, pixels.get(), skcms_PixelFormat_RGBA_8888, skcms_AlphaFormat_Unpremul,
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skcms_sRGB_profile(), info.xsize * info.ysize));
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float_pixels.reset();
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return ImageData.new_(
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Uint8ClampedArray.new_(typed_memory_view(info.xsize * info.ysize * 4, pixels.get())),
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info.xsize, info.ysize);
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}
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EMSCRIPTEN_BINDINGS(my_module) {
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function("decode", &decode);
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}
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