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Wuffs LDR loader: work-buffer cap 1 GiB + 64 KiB, so 8-bit RGBA and 16-bit gray+alpha PNGs load at 16384x16384

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Richard Geldreich
2026-10-23 18:01:17 -04:00
co-authored by Claude Opus 5.5
parent 82fc8ca5de
commit 5586688df4
1 changed files with 6 additions and 6 deletions
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encoder/basisu_enc.h
+6 -6
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@@ -3997,13 +3997,13 @@ namespace basisu
#ifndef BASISU_WUFFS_LDR_MAX_DIM
#define BASISU_WUFFS_LDR_MAX_DIM basist::BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION
#endif
// Largest Wuffs work buffer we allocate: 1 GiB. This bounds how much a small corrupt/truncated file claiming a huge image can make the
// loader allocate (up to 1 GiB of pixels + this much work buffer) before Wuffs finds the data missing. Tradeoff: images within the
// dimension cap whose decode needs more work buffer are rejected - e.g. progressive JPEGs above ~15.4K^2 (4:2:0), ~13.4K^2 (4:2:2),
// ~10.9K^2 (4:4:4) or ~9.4K^2 (CMYK/YCCK 4:4:4); 16-bit RGB/RGBA PNGs above ~13.4K^2 / ~11.6K^2; 8-bit RGBA PNGs only at exactly
// 16384x16384. Raise it with -D if needed.
// Largest Wuffs work buffer we allocate: 1 GiB + 64 KiB. This bounds how much a small corrupt/truncated file claiming a huge image can make
// the loader allocate (up to 1 GiB of pixels + this much work buffer) before Wuffs finds the data missing. The extra 64 KiB covers PNG's
// one filter byte per row, so 8-bit RGBA and 16-bit gray+alpha PNGs load at the full 16384x16384. Tradeoff: images within the dimension
// cap whose decode needs more work buffer are rejected - e.g. progressive JPEGs above ~15.4K^2 (4:2:0), ~13.4K^2 (4:2:2), ~10.9K^2 (4:4:4)
// or ~9.4K^2 (CMYK/YCCK 4:4:4); 16-bit RGB/RGBA PNGs above ~13.4K^2 / ~11.6K^2. Raise it with -D if needed.
#ifndef BASISU_WUFFS_LDR_MAX_WORKBUF_BYTES
#define BASISU_WUFFS_LDR_MAX_WORKBUF_BYTES (1ULL * 1024 * 1024 * 1024)
#define BASISU_WUFFS_LDR_MAX_WORKBUF_BYTES ((1ULL << 30) + 65536)
#endif
// Header-only query (no pixel decode, no size cap): true dimensions of a .PNG/.TGA/.JPG/.QOI file, even one larger than the decode cap.