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vipsthumbnail shrinks to a scanline cache 

so it works well with the new :seq mode for png
This commit is contained in:
John Cupitt 2012-02-08 14:05:58 +00:00
parent e0f31e3b4a
commit ed2f979497
1 changed files with 27 additions and 10 deletions
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37
tools/vipsthumbnail.c
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@ -23,6 +23,8 @@
* - use new "rd" mode rather than our own open via disc
* 8/2/12
* - use :seq mode for png images
* - shrink to a scanline cache to ensure we request pixels sequentially
* from the input
*/
#ifdef HAVE_CONFIG_H
@ -157,14 +159,28 @@ shrink_factor( IMAGE *in, IMAGE *out,
x = t[1];
}
/* Shrink!
/* Shrink!
*
* We want to make sure we read the image sequentially
* so that :seq mode works. However, the convolution we may be doing
* later will force us into SMALLTILE mode and that will break
* sequentiallity.
*
* So ... read into a cache where tiles are scanlines, and make sure
* we keep enough scanlines to be able to serve a line of tiles.
*/
if( im_shrink( x, t[2], shrink, shrink ) ||
im_affinei_all( t[2], t[3],
interp, residual, 0, 0, residual, 0, 0 ) )
im_tile_cache( t[2], t[3],
t[2]->Xsize, 1,
VIPS__TILE_HEIGHT * 2 ) )
return( -1 );
x = t[3];
if( im_affinei_all( t[3], t[4],
interp, residual, 0, 0, residual, 0, 0 ) )
return( -1 );
x = t[4];
/* If we are upsampling, don't sharpen, since nearest looks dumb
* sharpened.
*/
@ -172,9 +188,9 @@ shrink_factor( IMAGE *in, IMAGE *out,
if( verbose )
printf( "sharpening thumbnail\n" );
if( im_conv( x, t[4], sharpen_filter() ) )
if( im_conv( x, t[5], sharpen_filter() ) )
return( -1 );
x = t[4];
x = t[5];
}
/* Colour management: we can transform the image if we have an output
@ -188,7 +204,7 @@ shrink_factor( IMAGE *in, IMAGE *out,
if( verbose )
printf( "importing with embedded profile\n" );
if( im_icc_import_embedded( x, t[5],
if( im_icc_import_embedded( x, t[6],
IM_INTENT_RELATIVE_COLORIMETRIC ) )
return( -1 );
}
@ -197,7 +213,7 @@ shrink_factor( IMAGE *in, IMAGE *out,
printf( "importing with profile %s\n",
import_profile );
if( im_icc_import( x, t[5],
if( im_icc_import( x, t[6],
import_profile,
IM_INTENT_RELATIVE_COLORIMETRIC ) )
return( -1 );
@ -206,12 +222,12 @@ shrink_factor( IMAGE *in, IMAGE *out,
if( verbose )
printf( "exporting with profile %s\n", export_profile );
if( im_icc_export_depth( t[5], t[6],
if( im_icc_export_depth( t[6], t[7],
8, export_profile,
IM_INTENT_RELATIVE_COLORIMETRIC ) )
return( -1 );
x = t[6];
x = t[7];
}
if( !nodelete_profile ) {
@ -253,7 +269,8 @@ thumbnail3( IMAGE *in, IMAGE *out )
if( verbose ) {
printf( "integer shrink by %d\n", shrink );
printf( "residual scale by %g\n", residual );
printf( "%s interpolation\n", VIPS_OBJECT( interp )->nickname );
printf( "%s interpolation\n",
VIPS_OBJECT_GET_CLASS( interp )->nickname );
}
result = shrink_factor( in, out, shrink, residual, interp );