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LibGfx: Add a .pam loader

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.pam is a "portrable arbitrarymap" as documented at
https://netpbm.sourceforge.net/doc/pam.html

It's very similar to .pbm, .pgm, and .ppm, so this uses the
PortableImageMapLoader framework. The header is slightly different,
so this has a custom header parsing function.

Also, .pam only exixts in binary form, so the ascii form support
becomes optional.
This commit is contained in:
Nico Weber 2024-01-24 21:27:24 -05:00 • committed by Andreas Kling
parent 0d76a9da17
commit 187862ebe0
9 changed files with 173 additions and 9 deletions
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11
Userland/Libraries/LibGfx/ImageFormats/PortableImageMapLoader.h
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@ -85,7 +85,10 @@ ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> PortableImageDecoderPlugin<TContext>:
{
auto stream = TRY(try_make<FixedMemoryStream>(data));
auto plugin = TRY(adopt_nonnull_own_or_enomem(new (nothrow) PortableImageDecoderPlugin<TContext>(move(stream))));
TRY(read_header(*plugin->m_context));
if constexpr (TContext::FormatDetails::binary_magic_number == '7')
TRY(read_pam_header(*plugin->m_context));
else
TRY(read_header(*plugin->m_context));
return plugin;
}
@ -96,8 +99,10 @@ bool PortableImageDecoderPlugin<TContext>::sniff(ReadonlyBytes data)
if (data.size() < 2)
return false;
if (data.data()[0] == 'P' && data.data()[1] == Context::FormatDetails::ascii_magic_number)
return true;
if constexpr (requires { Context::FormatDetails::ascii_magic_number; }) {
if (data.data()[0] == 'P' && data.data()[1] == Context::FormatDetails::ascii_magic_number)
return true;
}
if (data.data()[0] == 'P' && data.data()[1] == Context::FormatDetails::binary_magic_number)
return true;