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im_blend() can take non-uchar conditions

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John Cupitt 2010-10-01 15:45:55 +00:00
parent 05b92ea6e5
commit 08ebc9e535
4 changed files with 15 additions and 13 deletions
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1
ChangeLog
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@ -31,6 +31,7 @@
- added im_read_point(), now partial, moved im_readpoint() to deprecated
- added im_draw_smudge(), moved im_smudge() / im_smear() to deprecated
- convolution functions support complex images
- im_blend() can have any format condition image and it's converted to uchar
12/5/10 started 7.22.2
- the conditional image of ifthenelse can be any format, a (!=0) is added if

8
TODO
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@ -5,14 +5,6 @@
make a region, prepare to that, copy back over the image?
- smudge is too strong ... tone it down a bit
- can we make more use of im__draw_pel()? eg. im_draw_rect() etc.
- im_blend() is rather fussy about formats, argh
cf. im_ifthenelse() and the extra !=0 it adds?

4
libvips/inplace/im_draw_smudge.c
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@ -100,8 +100,8 @@ im_draw_smudge( VipsImage *im, int left, int top, int width, int height )
return( 0 );
if( !blur ) {
blur = im_create_imaskv( "im_draw_smudge", 3, 1, 1, 2, 1 );
blur->scale = 4;
blur = im_create_imaskv( "im_draw_smudge", 3, 1, 1, 4, 1 );
blur->scale = 6;
}
if( !(t[0] = im_open( "im_draw_smudge", "p" )) )

15
libvips/relational/im_blend.c
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@ -323,7 +323,7 @@ blend( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
* @b: else #IMAGE
* @out: output #IMAGE
*
* This operation scans the condition image @c (which must be unsigned char)
* This operation scans the condition image @c
* and uses it to blend pixels from either the then image @a or the else
* image @b. 255 means @a only, 0 means @b only, and intermediate values are a
* mixture.
@ -348,9 +348,9 @@ im_blend( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
const int repack = a->Coding == IM_CODING_LABQ &&
b->Coding == IM_CODING_LABQ;
IMAGE *t[7];
IMAGE *t[8];
if( im_open_local_array( out, t, 7, "im_blend", "p" ) )
if( im_open_local_array( out, t, 8, "im_blend", "p" ) )
return( -1 );
/* Unpack LABPACK as a courtesy.
@ -366,6 +366,15 @@ im_blend( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
b = t[1];
}
/* c must be uchar.
*/
if( c->BandFmt != IM_BANDFMT_UCHAR ) {
if( im_clip2fmt( c, t[7], IM_BANDFMT_UCHAR ) )
return( -1 );
c = t[7];
}
/* Make a and b match in bands and format.
*/
if( im__formatalike( a, b, t[2], t[3] ) ||