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| author | Robin Watts <robin.watts@artifex.com> | 2012-04-05 17:48:24 +0100 |
|---|---|---|
| committer | Robin Watts <robin.watts@artifex.com> | 2012-04-05 18:01:16 +0100 |
| commit | ff55e72b741b955bbd0e23bd9d724c6682a181ac (patch) | |
| tree | f18deb262d2730c18d18faa0f10ba656fd530d4f /fitz | |
| parent | 4184ba5d2930b337fddf3ad8e612a88adb08d8c1 (diff) | |
| download | mupdf-ff55e72b741b955bbd0e23bd9d724c6682a181ac.tar.xz | |
Bug 692946 - fix 'stray white pixels in black areas' when halftoning.
Depending on the operation used (< or <=) the threshold array should
never have either 0 and ff in it. As we are using <, it should never
have 0 in it. Fixed here.
Diffstat (limited to 'fitz')
| -rw-r--r-- | fitz/res_halftone.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fitz/res_halftone.c b/fitz/res_halftone.c index daad6e37..3b5e0e51 100644 --- a/fitz/res_halftone.c +++ b/fitz/res_halftone.c @@ -36,6 +36,10 @@ fz_drop_halftone(fz_context *ctx, fz_halftone *ht) } /* Default mono halftone, lifted from Ghostscript. */ +/* The 0x00 entry has been changed to 0x01 to avoid problems with white + * pixels appearing in the output; as we use < 0 should not appear in the + * array. I think that gs scales this slighly and hence never actually uses + * the raw values here. */ static unsigned char mono_ht[] = { 0x0E, 0x8E, 0x2E, 0xAE, 0x06, 0x86, 0x26, 0xA6, 0x0C, 0x8C, 0x2C, 0xAC, 0x04, 0x84, 0x24, 0xA4, @@ -50,7 +54,7 @@ static unsigned char mono_ht[] = 0xCD, 0x4D, 0xED, 0x6D, 0xC5, 0x45, 0xE5, 0x65, 0xCF, 0x4F, 0xEF, 0x6F, 0xC7, 0x47, 0xE7, 0x67, 0x3D, 0xBD, 0x1D, 0x9D, 0x35, 0xB5, 0x15, 0x95, 0x3F, 0xBF, 0x1F, 0x9F, 0x37, 0xB7, 0x17, 0x97, 0xFD, 0x7D, 0xDD, 0x5D, 0xF5, 0x75, 0xD5, 0x55, 0xFF, 0x7F, 0xDF, 0x5F, 0xF7, 0x77, 0xD7, 0x57, - 0x02, 0x82, 0x22, 0xA2, 0x0A, 0x8A, 0x2A, 0xAA, 0x00, 0x80, 0x20, 0xA0, 0x08, 0x88, 0x28, 0xA8, + 0x02, 0x82, 0x22, 0xA2, 0x0A, 0x8A, 0x2A, 0xAA, 0x01 /*0x00*/, 0x80, 0x20, 0xA0, 0x08, 0x88, 0x28, 0xA8, 0xC2, 0x42, 0xE2, 0x62, 0xCA, 0x4A, 0xEA, 0x6A, 0xC0, 0x40, 0xE0, 0x60, 0xC8, 0x48, 0xE8, 0x68, 0x32, 0xB2, 0x12, 0x92, 0x3A, 0xBA, 0x1A, 0x9A, 0x30, 0xB0, 0x10, 0x90, 0x38, 0xB8, 0x18, 0x98, 0xF2, 0x72, 0xD2, 0x52, 0xFA, 0x7A, 0xDA, 0x5A, 0xF0, 0x70, 0xD0, 0x50, 0xF8, 0x78, 0xD8, 0x58 |