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better sanity checking for input profiles 

previously it could get RGBA and CMYK images mixed up, see:

https://github.com/lovell/sharp/issues/237
This commit is contained in:
John Cupitt 2015-06-26 11:07:00 +01:00
parent a812e90332
commit 6ffdc6a7b7
2 changed files with 63 additions and 7 deletions
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7
TODO
View File

@ -1,4 +1,9 @@
- fix up docs for HSV
- colour needs to split _build() into preprocess / process / postprocess
phases
in icc_import, for example, we want to check that the supplied profile is
compatible with the input image as it will be when unpacked and ready for
process_line
- how about something like vips_grid() which turns a tall thin one-band
image into a much smaller many-band image?

63
libvips/colour/icc_transform.c
View File

@ -31,6 +31,8 @@
* 29/9/14
* - check input profiles for compatibility with the input image, thanks
* James
* 26/6/15
* - better profile sanity checking for icc import
*/
/*
@ -489,6 +491,57 @@ vips_icc_profile_needs_bands( cmsHPROFILE profile )
return( needs_bands );
}
/* How many bands we expect to see from an image after preprocessing by our
* parent classes. This is a bit fragile :-(
*
* FIXME ... split the _build() for colour into separate preprocess / process
* / postprocess phases so we can load profiles after preprocess but before
* actual processing takes place.
*/
static int
vips_image_expected_bands( VipsImage *image )
{
int expected_bands;
switch( image->Bands ) {
case VIPS_INTERPRETATION_B_W:
case VIPS_INTERPRETATION_GREY16:
expected_bands = 1;
break;
case VIPS_INTERPRETATION_XYZ:
case VIPS_INTERPRETATION_LAB:
case VIPS_INTERPRETATION_LABQ:
case VIPS_INTERPRETATION_RGB:
case VIPS_INTERPRETATION_CMC:
case VIPS_INTERPRETATION_LCH:
case VIPS_INTERPRETATION_LABS:
case VIPS_INTERPRETATION_sRGB:
case VIPS_INTERPRETATION_YXY:
case VIPS_INTERPRETATION_RGB16:
case VIPS_INTERPRETATION_scRGB:
case VIPS_INTERPRETATION_HSV:
expected_bands = 3;
break;
case VIPS_INTERPRETATION_CMYK:
expected_bands = 4;
break;
case VIPS_INTERPRETATION_MULTIBAND:
case VIPS_INTERPRETATION_HISTOGRAM:
case VIPS_INTERPRETATION_MATRIX:
case VIPS_INTERPRETATION_FOURIER:
default:
expected_bands = image->Bands;
break;
}
expected_bands = VIPS_MIN( expected_bands, image->Bands );
return( expected_bands );
}
static cmsHPROFILE
vips_icc_load_profile_image( const char *domain, VipsImage *image )
{
@ -506,9 +559,8 @@ vips_icc_load_profile_image( const char *domain, VipsImage *image )
return( NULL );
}
/* We allow extra bands for eg. alpha.
*/
if( image->Bands < vips_icc_profile_needs_bands( profile ) ) {
if( vips_image_expected_bands( image ) !=
vips_icc_profile_needs_bands( profile ) ) {
VIPS_FREEF( cmsCloseProfile, profile );
vips_warn( domain,
"%s", _( "embedded profile incompatible with image" ) );
@ -530,9 +582,8 @@ vips_icc_load_profile_file( const char *domain,
return( NULL );
}
/* We allow extra bands for eg. alpha.
*/
if( image->Bands < vips_icc_profile_needs_bands( profile ) ) {
if( vips_image_expected_bands( image ) !=
vips_icc_profile_needs_bands( profile ) ) {
VIPS_FREEF( cmsCloseProfile, profile );
vips_warn( domain,
_( "profile \"%s\" incompatible with image" ),