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ICC: Add method to convert a color to the profile connection space

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Only implemented for matrix profiles so far.

This API won't be fast enough to color manage images, but let's
get something working before getting something fast.
This commit is contained in:
Nico Weber 2023-04-28 09:10:20 -04:00 • committed by Andreas Kling
parent e76d2238bb
commit af453b246a
3 changed files with 145 additions and 0 deletions
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21
Userland/Libraries/LibGfx/ICC/Profile.h
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@ -16,6 +16,7 @@
#include <LibCrypto/Hash/MD5.h>
#include <LibGfx/ICC/DistinctFourCC.h>
#include <LibGfx/ICC/TagTypes.h>
#include <LibGfx/Vector3.h>
namespace Gfx::ICC {
@ -257,6 +258,19 @@ public:
bool is_v2() const { return version().major_version() == 2; }
bool is_v4() const { return version().major_version() == 4; }
// FIXME: The color conversion stuff should be in some other class.
// Converts an 8-bits-per-channel color to the profile connection space.
// The color's number of channels must match number_of_components_in_color_space(data_color_space()).
// Do not call for DeviceLink or NamedColor profiles. (XXX others?)
// Call connection_space() to find out the space the result is in.
ErrorOr<FloatVector3> to_pcs(ReadonlyBytes);
// Only call these if you know that this is an RGB matrix-based profile.
XYZ const& red_matrix_column() const;
XYZ const& green_matrix_column() const;
XYZ const& blue_matrix_column() const;
private:
Profile(ProfileHeader const& header, OrderedHashMap<TagSignature, NonnullRefPtr<TagData>> tag_table)
: m_header(header)
@ -264,6 +278,13 @@ private:
{
}
XYZ const& xyz_data(TagSignature tag) const
{
auto const& data = *m_tag_table.get(tag).value();
VERIFY(data.type() == XYZTagData::Type);
return static_cast<XYZTagData const&>(data).xyz();
}
ErrorOr<void> check_required_tags();
ErrorOr<void> check_tag_types();