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fix: implement proper ZLIB compression to resolve PNG bloat #964

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Aug 31, 2025
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fix: implement proper ZLIB compression to resolve PNG bloat #964

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4 changes: 2 additions & 2 deletions src/external/fortplot_zlib_core.f90
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Original file line number Diff line number Diff line change
Expand Up @@ -121,9 +121,9 @@ function zlib_compress(input_data, input_len, output_len) result(output_data)
output_data(pos+1) = int(z'9C', int8)
pos = pos + 2

! Generate simple uncompressed DEFLATE blocks
! Generate compressed DEFLATE blocks using Huffman coding
compressed_len = 1
call compress_with_uncompressed_blocks(input_data, input_len, compressed_data, compressed_len)
call compress_with_fixed_huffman(input_data, input_len, compressed_data, compressed_len)

! Bounds check before copying compressed data
if (compressed_len > size(compressed_data)) then
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