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fix clipping with new mapim cods

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we had the clip in the wrong place

see https://github.com/libvips/libvips/issues/1180
This commit is contained in:
John Cupitt 2018-12-17 20:29:31 +00:00
parent 582b224125
commit 6ba4b3bfdb
2 changed files with 10 additions and 10 deletions
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14
libvips/resample/mapim.c
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@ -231,8 +231,8 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
TYPE * restrict p1 = (TYPE *) p; \
\
for( x = 0; x < r->width; x++ ) { \
TYPE px = p1[0] + window_offset; \
TYPE py = p1[1] + window_offset; \
TYPE px = p1[0]; \
TYPE py = p1[1]; \
\
if( px >= clip_width || \
py >= clip_height ) { \
@ -240,7 +240,8 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
q[z] = 0; \
} \
else \
interpolate( mapim->interpolate, q, ir[0], px, py ); \
interpolate( mapim->interpolate, q, ir[0], \
px + window_offset, py + window_offset ); \
\
p1 += 2; \
q += ps; \
@ -251,8 +252,8 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
TYPE * restrict p1 = (TYPE *) p; \
\
for( x = 0; x < r->width; x++ ) { \
TYPE px = p1[0] + window_offset; \
TYPE py = p1[1] + window_offset; \
TYPE px = p1[0]; \
TYPE py = p1[1]; \
\
if( px < 0 || \
px >= clip_width || \
@ -262,7 +263,8 @@ vips_mapim_region_minmax( VipsRegion *region, VipsRect *r, VipsRect *bounds )
q[z] = 0; \
} \
else \
interpolate( mapim->interpolate, q, ir[0], px, py ); \
interpolate( mapim->interpolate, q, ir[0], \
px + window_offset, py + window_offset ); \
\
p1 += 2; \
q += ps; \

6
test/test-suite/test_resample.py
View File

@ -200,11 +200,9 @@ class TestResample:
# this was a bug at one point, strangely, if executed with debug
# enabled
mp = pyvips.Image.xyz(100, 100)
mp = pyvips.Image.xyz(im.width, im.height)
interp = pyvips.Interpolate.new('bicubic')
assert im.mapim(mp, interpolate=interp).avg() == \
im.crop(0, 0, 100, 100).avg()
assert im.mapim(mp, interpolate=interp).avg() == im.avg()
if __name__ == '__main__':