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Few more simplifications to JXL decoder

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This commit is contained in:
Ingvar Stepanyan
2020-10-30 13:42:38 +00:00
parent eed44dff97
commit eb08d0049a
2 changed files with 15 additions and 11 deletions
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26
codecs/jxl/dec/jxl_dec.cpp
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@@ -11,6 +11,9 @@ using namespace emscripten;
thread_local const val Uint8ClampedArray = val::global("Uint8ClampedArray");
thread_local const val ImageData = val::global("ImageData");
// R, G, B, A
#define COMPONENTS_PER_PIXEL 4
#define EXPECT_TRUE(a) \
if (!(a)) \
return val::null();
@@ -24,14 +27,14 @@ val decode(std::string data) {
EXPECT_EQ(JXL_DEC_SUCCESS,
JxlDecoderSubscribeEvents(
dec.get(), JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE));
auto next_in = (const uint8_t*)data.c_str();
auto avail_in = data.size();
EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec.get(), &next_in, &avail_in));
size_t buffer_size;
const JxlPixelFormat format = {4, JXL_LITTLE_ENDIAN, JXL_TYPE_FLOAT};
EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderImageOutBufferSize(dec.get(), &format, &buffer_size));
JxlBasicInfo info;
EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec.get(), &info));
size_t pixel_count = info.xsize * info.ysize;
size_t component_count = pixel_count * COMPONENTS_PER_PIXEL;
EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec.get(), &next_in, &avail_in));
size_t icc_size;
@@ -42,12 +45,13 @@ val decode(std::string data) {
JxlDecoderGetColorAsICCProfile(dec.get(), JXL_COLOR_PROFILE_TARGET_DATA,
icc_profile.data(), icc_profile.size()));
auto float_pixels = std::make_unique<float[]>((buffer_size + 3) / 4);
EXPECT_EQ(JXL_DEC_SUCCESS,
JxlDecoderSetImageOutBuffer(dec.get(), &format, float_pixels.get(), buffer_size));
auto float_pixels = std::make_unique<float[]>(component_count);
static const JxlPixelFormat format = {COMPONENTS_PER_PIXEL, JXL_LITTLE_ENDIAN, JXL_TYPE_FLOAT};
EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(dec.get(), &format, float_pixels.get(),
component_count * sizeof(float)));
EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec.get(), &next_in, &avail_in));
auto pixels = std::make_unique<uint8_t[]>(info.xsize * info.ysize * 4);
auto byte_pixels = std::make_unique<uint8_t[]>(component_count);
// Convert to sRGB.
skcms_ICCProfile jxl_profile;
// If the image is encoded in its original color space, the decoded data will be in the color
@@ -63,12 +67,12 @@ val decode(std::string data) {
EXPECT_TRUE(skcms_Transform(
float_pixels.get(), skcms_PixelFormat_RGBA_ffff,
info.alpha_premultiplied ? skcms_AlphaFormat_PremulAsEncoded : skcms_AlphaFormat_Unpremul,
&jxl_profile, pixels.get(), skcms_PixelFormat_RGBA_8888, skcms_AlphaFormat_Unpremul,
skcms_sRGB_profile(), info.xsize * info.ysize));
&jxl_profile, byte_pixels.get(), skcms_PixelFormat_RGBA_8888, skcms_AlphaFormat_Unpremul,
skcms_sRGB_profile(), pixel_count));
return ImageData.new_(
Uint8ClampedArray.new_(typed_memory_view(info.xsize * info.ysize * 4, pixels.get())),
info.xsize, info.ysize);
Uint8ClampedArray.new_(typed_memory_view(component_count, byte_pixels.get())), info.xsize,
info.ysize);
}
EMSCRIPTEN_BINDINGS(my_module) {

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codecs/jxl/dec/jxl_dec.wasm
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