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WebP: Add missing spec quotes in a comment, tweak whitespace

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Nico Weber 2023-06-07 11:43:31 -04:00 • committed by Tim Flynn
parent 141143a1c6
commit 4e92027513
1 changed files with 5 additions and 3 deletions
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8
Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp
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@ -266,12 +266,12 @@ static ErrorOr<void> decode_webp_chunk_ALPH(Chunk const& alph_chunk, Bitmap& bit
// [...]
//
// The final value is derived by adding the decompressed value X to the predictor and using modulo-256 arithmetic"
switch (filtering_method) {
case 0:
// Method 0: predictor = 0
// "Method 0: predictor = 0"
// Nothing to do.
break;
case 1:
// "Method 1: predictor = A"
// "The top-left value at location (0, 0) uses 0 as predictor value. Otherwise,
@ -286,6 +286,7 @@ static ErrorOr<void> decode_webp_chunk_ALPH(Chunk const& alph_chunk, Bitmap& bit
}
}
break;
case 2:
// "Method 2: predictor = B"
// "The top-left value at location (0, 0) uses 0 as predictor value. Otherwise,
@ -300,6 +301,7 @@ static ErrorOr<void> decode_webp_chunk_ALPH(Chunk const& alph_chunk, Bitmap& bit
}
}
break;
case 3:
// "Method 3: predictor = clip(A + B - C)"
// where clip(v) is equal to:
@ -321,8 +323,8 @@ static ErrorOr<void> decode_webp_chunk_ALPH(Chunk const& alph_chunk, Bitmap& bit
alpha[y * bitmap.width() + x] += clamp(A + B - C, 0, 255);
}
}
break;
default:
return Error::from_string_literal("WebPImageDecoderPlugin: uncompressed ALPH invalid filtering method");
}