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reverse the direction of rot45 

now matches the rest of vips
This commit is contained in:
John Cupitt 2013-10-25 13:24:48 +01:00
parent dec76f566d
commit 25fd67bb84
1 changed files with 35 additions and 35 deletions
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70
libvips/conversion/rot45.c
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@ -116,7 +116,7 @@ vips_rot45_rot45( VipsImage *out, VipsImage *in )
g_assert( in->Xsize % 2 == 1 );
/* Split the square into 8 triangles. Loop over the top-left one,
* reflect into the others.
* reflect to index the others.
*
* 1 1 2 2 3
* 8 1 2 3 3
@ -129,48 +129,48 @@ vips_rot45_rot45( VipsImage *out, VipsImage *in )
for( y = 0; y < size_2; y++ )
for( x = y; x < size_2; x++ ) {
/* Save 1, it goes into 8 at the end.
/* Save 1, it goes into 2 at the end.
*/
POINT_TO_TEMP( temp, x, y );
/* Fill 1 from 2.
/* Fill 1 from 8.
*/
ASSIGN( x, y,
(x - y) + size_2, y );
/* 2 from 3.
*/
ASSIGN( (x - y) + size_2, y,
(size - 1) - y, x );
/* 3 from 4.
*/
ASSIGN( (size - 1) - y, x,
(size - 1) - y, (x - y) + size_2 );
/* 4 from 5.
*/
ASSIGN( (size - 1) - y, (x - y) + size_2,
(size - 1) - x, (size - 1) - y );
/* 5 from 6.
*/
ASSIGN( (size - 1) - x, (size - 1) - y,
size_2 - (x - y), (size - 1) - y );
/* 6 from 7.
*/
ASSIGN( size_2 - (x - y), (size - 1) - y,
y, (size - 1) - x );
/* 7 from 8.
*/
ASSIGN( y, (size - 1) - x,
y, size_2 - (x - y) );
/* 8 from saved 1.
/* 8 from 7.
*/
TEMP_TO_POINT( y, size_2 - (x - y), temp );
ASSIGN( y, size_2 - (x - y),
y, (size - 1) - x );
/* 7 from 6.
*/
ASSIGN( y, (size - 1) - x,
size_2 - (x - y), (size - 1) - y );
/* 6 from 5.
*/
ASSIGN( size_2 - (x - y), (size - 1) - y,
(size - 1) - x, (size - 1) - y );
/* 5 from 4.
*/
ASSIGN( (size - 1) - x, (size - 1) - y,
(size - 1) - y, (x - y) + size_2 );
/* 4 from 3.
*/
ASSIGN( (size - 1) - y, (x - y) + size_2,
(size - 1) - y, x );
/* 3 from 2.
*/
ASSIGN( (size - 1) - y, x,
(x - y) + size_2, y );
/* 2 from saved 1.
*/
TEMP_TO_POINT( (x - y) + size_2, y, temp );
}
/* Centre.