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improve accuracy of vector path

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John Cupitt 2018-06-13 16:23:21 +01:00
parent a3394dc756
commit e6edcfe20d
2 changed files with 2 additions and 1 deletions
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ChangeLog
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@ -5,6 +5,7 @@
- configure test for g++ 7.2 and composite.cpp - configure test for g++ 7.2 and composite.cpp
- don't Ping in magickload, too unreliable - don't Ping in magickload, too unreliable
- ensure WebP can add metadata when compiled with libwebpmux [lovell] - ensure WebP can add metadata when compiled with libwebpmux [lovell]
- improve accuracy of vector path convolution [felixbuenemann]
12/2/18 started 8.6.3 12/2/18 started 8.6.3
- use pkg-config to find libjpeg, if we can - use pkg-config to find libjpeg, if we can

2
libvips/convolution/convi.c
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@ -909,7 +909,7 @@ vips_convi_intize( VipsConvi *convi, VipsImage *M )
* later, so 1.0 (for example) would become 128, which is outside * later, so 1.0 (for example) would become 128, which is outside
* signed 8 bit. * signed 8 bit.
*/ */
shift = ceil( log2( mx + 1 ) ); shift = ceil( log2( mx ) + 1 );
/* We need to sum n_points, so we have to shift right before adding a /* We need to sum n_points, so we have to shift right before adding a
* new value to make sure we have enough range. * new value to make sure we have enough range.