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Support Other Uncompressed Component Formats #1650

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e2d11d9
support writing other uncC component_format types (monochrome)
dukesook Dec 29, 2025
c653945
resolve warning with explicit type cast
dukesook Dec 29, 2025
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32 changes: 30 additions & 2 deletions libheif/codecs/uncompressed/unc_codec.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -988,12 +988,14 @@ Error fill_cmpd_and_uncC(std::shared_ptr<Box_cmpd>& cmpd,
}

int bpp = image->get_bits_per_pixel(heif_channel_Y);
Box_uncC::Component component0 = {0, (uint8_t) (bpp), component_format_unsigned, 0};
heif_uncompressed_component_format format = to_unc_component_format(image, heif_channel_Y);
Box_uncC::Component component0 = {0, (uint8_t) (bpp), (uint8_t) format, 0};
uncC->add_component(component0);

if (save_alpha_channel && image->has_channel(heif_channel_Alpha)) {
heif_uncompressed_component_format format_alpha = to_unc_component_format(image, heif_channel_Alpha);
bpp = image->get_bits_per_pixel(heif_channel_Alpha);
Box_uncC::Component component1 = {1, (uint8_t) (bpp), component_format_unsigned, 0};
Box_uncC::Component component1 = {1, (uint8_t) (bpp), (uint8_t) format_alpha, 0};
uncC->add_component(component1);
}

Expand All @@ -1018,3 +1020,29 @@ Error fill_cmpd_and_uncC(std::shared_ptr<Box_cmpd>& cmpd,
}
return Error::Ok;
}

heif_uncompressed_component_format to_unc_component_format(heif_channel_datatype channel_datatype)
{
switch (channel_datatype) {
case heif_channel_datatype_signed_integer:
return component_format_signed;

case heif_channel_datatype_floating_point:
return component_format_float;

case heif_channel_datatype_complex_number:
return component_format_complex;

case heif_channel_datatype_unsigned_integer:
case heif_channel_datatype_undefined:
default:
return component_format_unsigned;
}
}

heif_uncompressed_component_format to_unc_component_format(const std::shared_ptr<const HeifPixelImage>& image, heif_channel channel)
{
heif_channel_datatype datatype = image->get_datatype(channel);
heif_uncompressed_component_format component_format = to_unc_component_format(datatype);
return component_format;
}
3 changes: 3 additions & 0 deletions libheif/codecs/uncompressed/unc_codec.h
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,9 @@ bool map_uncompressed_component_to_channel(const std::shared_ptr<const Box_cmpd>
Box_uncC::Component component,
heif_channel *channel);

heif_uncompressed_component_format to_unc_component_format(heif_channel_datatype);

heif_uncompressed_component_format to_unc_component_format(const std::shared_ptr<const HeifPixelImage>&, heif_channel);

class UncompressedImageCodec
{
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