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LibGfx+LibPDF: Create filter_type() for converting u8 to FilterType

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...and use it in LibPDF.

No behavior change.
This commit is contained in:
Nico Weber 2023-11-16 19:37:42 -05:00 • committed by Andreas Kling
parent 7e4fe8e610
commit 588d6fab22
3 changed files with 23 additions and 17 deletions
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8
Userland/Libraries/LibGfx/ImageFormats/PNGShared.h
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@ -7,6 +7,7 @@
#pragma once
#include <AK/Array.h>
#include <AK/Error.h>
#include <AK/SIMD.h>
namespace Gfx::PNG {
@ -32,6 +33,13 @@ enum class FilterType : u8 {
Paeth,
};
inline ErrorOr<FilterType> filter_type(u8 byte)
{
if (byte <= 4)
return static_cast<FilterType>(byte);
return Error::from_string_literal("PNGImageDecoderPlugin: Invalid PNG filter");
}
// https://www.w3.org/TR/PNG/#9Filter-type-4-Paeth
ALWAYS_INLINE u8 paeth_predictor(u8 a, u8 b, u8 c)
{