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LibGfx: Make decode_huffman_stream take macroblocks by reference

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In progressive mode, this functions will need to be called multiple time
on the same macroblocks, so it shouldn't create the vector every
time it's called.
This commit is contained in:
Lucas CHOLLET 2023-02-19 23:48:25 -05:00 • committed by Andreas Kling
parent bae37676c2
commit 3fefb696a3
1 changed files with 7 additions and 7 deletions
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14
Userland/Libraries/LibGfx/JPEGLoader.cpp
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@ -363,11 +363,8 @@ static ErrorOr<void> build_macroblocks(JPEGLoadingContext& context, Vector<Macro
return {};
}
static ErrorOr<Vector<Macroblock>> decode_huffman_stream(JPEGLoadingContext& context)
static ErrorOr<void> decode_huffman_stream(JPEGLoadingContext& context, Vector<Macroblock>& macroblocks)
{
Vector<Macroblock> macroblocks;
macroblocks.resize(context.mblock_meta.padded_total);
if constexpr (JPEG_DEBUG) {
dbgln("Image width: {}", context.frame.width);
dbgln("Image height: {}", context.frame.height);
@ -416,8 +413,7 @@ static ErrorOr<Vector<Macroblock>> decode_huffman_stream(JPEGLoadingContext& con
}
}
}
return macroblocks;
return {};
}
static inline ErrorOr<void> ensure_bounds_okay(const size_t cursor, const size_t delta, const size_t bound)
@ -1252,6 +1248,9 @@ static ErrorOr<Vector<Macroblock>> construct_macroblocks(JPEGLoadingContext& con
// See: Figure B.16 – Flow of compressed data syntax
// This function handles the "Multi-scan" loop.
Vector<Macroblock> macroblocks;
macroblocks.resize(context.mblock_meta.padded_total);
Marker marker = TRY(read_marker_at_cursor(*context.stream));
while (true) {
if (is_miscellaneous_or_table_marker(marker)) {
@ -1259,7 +1258,8 @@ static ErrorOr<Vector<Macroblock>> construct_macroblocks(JPEGLoadingContext& con
} else if (marker == JPEG_SOS) {
TRY(read_start_of_scan(*context.stream, context));
TRY(scan_huffman_stream(*context.stream, context));
return TRY(decode_huffman_stream(context));
TRY(decode_huffman_stream(context, macroblocks));
return macroblocks;
} else {
dbgln_if(JPEG_DEBUG, "{}: Unexpected marker {:x}!", TRY(context.stream->tell()), marker);
return Error::from_string_literal("Unexpected marker");