forked from libvips/libvips
/
icc_transform.c
1367 lines (1142 loc) · 32.4 KB
/
icc_transform.c
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/* Transform images with little cms
*default:
*
* 26/4/02 JC
* 26/8/05
* - attach profiles and intents to output images
* - added im_icc_import_embedded() to import with an embedded profile
* 12/5/06
* - lock around cmsDoTransform
* 23/1/07
* - set RGB16 on 16-bit RGB export
* 6/4/09
* - catch lcms error messages
* 2/11/09
* - gtkdoc
* - small cleanups
* - call attach_profile() before im_wrapone() so the profile will get
* written if we are wrinting to a file
* 2/8/10
* - add lcms2
* 12/7/11
* - import and export cast @in to an appropriate format for you
* 25/9/12
* - redo as a class
* 14/5/13
* - import and export would segv on very wide images
* 12/11/13
* - support XYZ as an alternative PCS
* 10/9/14
* - support GRAY as an input and output space
* 29/9/14
* - check input profiles for compatibility with the input image, thanks
* James
* 26/6/15
* - better profile sanity checking for icc import
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#if defined( HAVE_LCMS ) || defined( HAVE_LCMS2 )
#include <stdio.h>
#include <math.h>
#include <assert.h>
/* Has to be before VIPS to avoid nameclashes.
*/
#ifdef HAVE_LCMS2
#include <lcms2.h>
#else /*HAVE_LCMS*/
#include <lcms.h>
/* Use the lcms2 names.
*/
#define cmsSigRgbData icSigRgbData
#define cmsSigLabData icSigLabData
#define cmsSigCmykData icSigCmykData
#define cmsSigXYZData icSigXYZData
#endif
#include <vips/vips.h>
#include "pcolour.h"
/* Call lcms with up to this many pixels at once.
*/
#define PIXEL_BUFFER_SIZE (10000)
/* LCMS1 was missing some stuff.
*/
#ifdef HAVE_LCMS
typedef DWORD cmsUInt32Number;
/* This doesn't exist in lcms1, just set it to zero.
*/
#define cmsFLAGS_NOCACHE (0)
#endif
/**
* VipsIntent:
* @VIPS_INTENT_PERCEPTUAL: perceptual rendering intent
* @VIPS_INTENT_RELATIVE: relative colorimetric rendering intent
* @VIPS_INTENT_SATURATION: saturation rendering intent
* @VIPS_INTENT_ABSOLUTE: absolute colorimetric rendering intent
*
* The rendering intent. #VIPS_INTENT_ABSOLUTE is best for
* scientific work, #VIPS_INTENT_RELATIVE is usually best for
* accurate communication with other imaging libraries.
*/
/**
* VipsPCS:
* @VIPS_PCS_LAB: use CIELAB D65 as the Profile Connection Space
* @VIPS_PCS_XYZ: use XYZ as the Profile Connection Space
*
* Pick a Profile Connection Space for vips_icc_import() and
* vips_icc_export(). LAB is usually best, XYZ can be more convenient in some
* cases.
*/
/**
* vips_icc_present:
*
* VIPS can optionally be built without the ICC library. Use this function to
* test for its availability.
*
* Returns: non-zero if the ICC library is present.
*/
int
vips_icc_present( void )
{
return( 1 );
}
#define VIPS_TYPE_ICC (vips_icc_get_type())
#define VIPS_ICC( obj ) \
(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
VIPS_TYPE_ICC, VipsIcc ))
#define VIPS_ICC_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_CAST( (klass), \
VIPS_TYPE_ICC, VipsIccClass))
#define VIPS_IS_ICC( obj ) \
(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_ICC ))
#define VIPS_IS_ICC_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_ICC ))
#define VIPS_ICC_GET_CLASS( obj ) \
(G_TYPE_INSTANCE_GET_CLASS( (obj), \
VIPS_TYPE_ICC, VipsIccClass ))
typedef struct _VipsIcc {
VipsColourCode parent_instance;
VipsIntent intent;
VipsPCS pcs;
int depth;
cmsHPROFILE in_profile;
cmsHPROFILE out_profile;
cmsUInt32Number in_icc_format;
cmsUInt32Number out_icc_format;
cmsHTRANSFORM trans;
/* We need to single-thread calls to LCMS 1.
*/
GMutex *lock;
} VipsIcc;
typedef VipsColourCodeClass VipsIccClass;
G_DEFINE_ABSTRACT_TYPE( VipsIcc, vips_icc, VIPS_TYPE_COLOUR_CODE );
/* Error from lcms.
*/
#ifdef HAVE_LCMS2
static void
icc_error( cmsContext context, cmsUInt32Number code, const char *text )
{
vips_error( "VipsIcc", "%s", text );
}
#else
static int
icc_error( int code, const char *text )
{
if( code == LCMS_ERRC_WARNING )
vips_warn( "VipsIcc", "%s", text );
else
vips_error( "VipsIcc", "%s", text );
return( 0 );
}
#endif
static void
vips_icc_dispose( GObject *gobject )
{
VipsIcc *icc = (VipsIcc *) gobject;
VIPS_FREEF( cmsDeleteTransform, icc->trans );
VIPS_FREEF( cmsCloseProfile, icc->in_profile );
VIPS_FREEF( cmsCloseProfile, icc->out_profile );
VIPS_FREEF( vips_g_mutex_free, icc->lock );
G_OBJECT_CLASS( vips_icc_parent_class )->dispose( gobject );
}
/* Is a profile just a pcs stub.
*/
static gboolean
is_pcs( cmsHPROFILE profile )
{
return( cmsGetColorSpace( profile ) == cmsSigLabData ||
cmsGetColorSpace( profile ) == cmsSigXYZData );
}
static int
vips_icc_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsColour *colour = (VipsColour *) object;
VipsColourCode *code = (VipsColourCode *) object;
VipsIcc *icc = (VipsIcc *) object;
if( icc->depth != 8 &&
icc->depth != 16 ) {
vips_error( class->nickname,
"%s", _( "depth must be 8 or 16" ) );
return( -1 );
}
if( icc->in_profile &&
code->in ) {
switch( cmsGetColorSpace( icc->in_profile ) ) {
case cmsSigRgbData:
colour->input_bands = 3;
code->input_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
VIPS_FORMAT_USHORT : VIPS_FORMAT_UCHAR;
icc->in_icc_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
TYPE_RGB_16 : TYPE_RGB_8;
break;
#ifdef HAVE_LCMS2
case cmsSigGrayData:
colour->input_bands = 1;
code->input_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
VIPS_FORMAT_USHORT : VIPS_FORMAT_UCHAR;
icc->in_icc_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
TYPE_GRAY_16 : TYPE_GRAY_8;
break;
#endif /*HAVE_LCMS2*/
case cmsSigCmykData:
colour->input_bands = 4;
code->input_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
VIPS_FORMAT_USHORT : VIPS_FORMAT_UCHAR;
icc->in_icc_format =
code->in->BandFmt == VIPS_FORMAT_USHORT ?
TYPE_CMYK_16 : TYPE_CMYK_8;
break;
case cmsSigLabData:
colour->input_bands = 3;
code->input_format = VIPS_FORMAT_FLOAT;
code->input_interpretation =
VIPS_INTERPRETATION_LAB;
icc->in_icc_format = TYPE_Lab_16;
break;
case cmsSigXYZData:
colour->input_bands = 3;
code->input_format = VIPS_FORMAT_FLOAT;
icc->in_icc_format = TYPE_XYZ_16;
break;
default:
vips_error( class->nickname,
_( "unimplemented input color space 0x%x" ),
cmsGetColorSpace( icc->in_profile ) );
return( -1 );
}
}
if( icc->out_profile )
switch( cmsGetColorSpace( icc->out_profile ) ) {
case cmsSigRgbData:
colour->interpretation =
icc->depth == 8 ?
VIPS_INTERPRETATION_RGB :
VIPS_INTERPRETATION_RGB16;
colour->format =
icc->depth == 8 ?
VIPS_FORMAT_UCHAR : VIPS_FORMAT_USHORT;
colour->bands = 3;
icc->out_icc_format =
icc->depth == 16 ?
TYPE_RGB_16 : TYPE_RGB_8;
break;
#ifdef HAVE_LCMS2
case cmsSigGrayData:
colour->interpretation =
icc->depth == 8 ?
VIPS_INTERPRETATION_B_W :
VIPS_INTERPRETATION_GREY16;
colour->format =
icc->depth == 8 ?
VIPS_FORMAT_UCHAR : VIPS_FORMAT_USHORT;
colour->bands = 1;
icc->out_icc_format =
icc->depth == 16 ?
TYPE_GRAY_16 : TYPE_GRAY_8;
break;
#endif /*HAVE_LCMS2*/
case cmsSigCmykData:
colour->interpretation = VIPS_INTERPRETATION_CMYK;
colour->format =
icc->depth == 8 ?
VIPS_FORMAT_UCHAR : VIPS_FORMAT_USHORT;
colour->bands = 4;
icc->out_icc_format =
icc->depth == 16 ?
TYPE_CMYK_16 : TYPE_CMYK_8;
break;
case cmsSigLabData:
colour->interpretation = VIPS_INTERPRETATION_LAB;
colour->format = VIPS_FORMAT_FLOAT;
colour->bands = 3;
icc->out_icc_format = TYPE_Lab_16;
break;
case cmsSigXYZData:
colour->interpretation = VIPS_INTERPRETATION_XYZ;
colour->format = VIPS_FORMAT_FLOAT;
colour->bands = 3;
icc->out_icc_format = TYPE_XYZ_16;
break;
default:
vips_error( class->nickname,
_( "unimplemented output color space 0x%x" ),
cmsGetColorSpace( icc->out_profile ) );
return( -1 );
}
/* At least one must be a device profile.
*/
if( icc->in_profile &&
icc->out_profile &&
is_pcs( icc->in_profile ) &&
is_pcs( icc->out_profile ) ) {
vips_error( class->nickname,
"%s", _( "no device profile" ) );
return( -1 );
}
/* Use cmsFLAGS_NOCACHE to disable the 1-pixel cache and make
* calling cmsDoTransform() from multiple threads safe.
*/
if( !(icc->trans = cmsCreateTransform(
icc->in_profile, icc->in_icc_format,
icc->out_profile, icc->out_icc_format,
icc->intent, cmsFLAGS_NOCACHE )) )
return( -1 );
if( VIPS_OBJECT_CLASS( vips_icc_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static void
vips_icc_class_init( VipsIccClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
gobject_class->dispose = vips_icc_dispose;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "icc";
object_class->description = _( "transform using ICC profiles" );
object_class->build = vips_icc_build;
VIPS_ARG_ENUM( class, "intent", 6,
_( "Intent" ),
_( "Rendering intent" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIcc, intent ),
VIPS_TYPE_INTENT, VIPS_INTENT_RELATIVE );
VIPS_ARG_ENUM( class, "pcs", 6,
_( "PCS" ),
_( "Set Profile Connection Space" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIcc, pcs ),
VIPS_TYPE_PCS, VIPS_PCS_LAB );
#ifdef HAVE_LCMS2
cmsSetLogErrorHandler( icc_error );
#else
/* Ask lcms not to abort on error.
*/
cmsErrorAction( LCMS_ERROR_IGNORE );
cmsSetErrorHandler( icc_error );
#endif
}
static void
vips_icc_init( VipsIcc *icc )
{
icc->lock = vips_g_mutex_new();
icc->intent = VIPS_INTENT_RELATIVE;
icc->pcs = VIPS_PCS_LAB;
icc->depth = 8;
}
typedef struct _VipsIccImport {
VipsIcc parent_instance;
gboolean embedded;
char *input_profile_filename;
} VipsIccImport;
typedef VipsIccClass VipsIccImportClass;
G_DEFINE_TYPE( VipsIccImport, vips_icc_import, VIPS_TYPE_ICC );
static void
vips_check_intent( const char *domain,
cmsHPROFILE profile, VipsIntent intent, int direction )
{
if( profile &&
!cmsIsIntentSupported( profile, intent, direction ) )
vips_warn( domain,
_( "intent %d (%s) not supported by "
"%s profile; falling back to default intent" ),
intent, vips_enum_nick( VIPS_TYPE_INTENT, intent ),
direction == LCMS_USED_AS_INPUT ?
_( "input" ) : _( "output" ) );
}
static int
vips_icc_profile_needs_bands( cmsHPROFILE profile )
{
int needs_bands;
switch( cmsGetColorSpace( profile ) ) {
#ifdef HAVE_LCMS2
case cmsSigGrayData:
needs_bands = 1;
break;
#endif /*HAVE_LCMS2*/
case cmsSigRgbData:
case cmsSigLabData:
case cmsSigXYZData:
needs_bands = 3;
break;
case cmsSigCmykData:
needs_bands = 4;
break;
default:
needs_bands = -1;
break;
}
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 )
{
void *data;
size_t data_length;
cmsHPROFILE profile;
if( !vips_image_get_typeof( image, VIPS_META_ICC_NAME ) )
return( NULL );
if( vips_image_get_blob( image, VIPS_META_ICC_NAME,
&data, &data_length ) ||
!(profile = cmsOpenProfileFromMem( data, data_length )) ) {
vips_warn( domain, "%s", _( "corrupt embedded profile" ) );
return( NULL );
}
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" ) );
return( NULL );
}
return( profile );
}
static cmsHPROFILE
vips_icc_load_profile_file( const char *domain,
VipsImage *image, const char *filename )
{
cmsHPROFILE profile;
if( !(profile = cmsOpenProfileFromFile( filename, "r" )) ) {
vips_error( domain,
_( "unable to open profile \"%s\"" ), filename );
return( NULL );
}
if( vips_image_expected_bands( image ) !=
vips_icc_profile_needs_bands( profile ) ) {
VIPS_FREEF( cmsCloseProfile, profile );
vips_warn( domain,
_( "profile \"%s\" incompatible with image" ),
filename );
return( NULL );
}
return( profile );
}
static int
vips_icc_import_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsColourCode *code = (VipsColourCode *) object;
VipsIcc *icc = (VipsIcc *) object;
VipsIccImport *import = (VipsIccImport *) object;
/* We read the input profile like this:
*
* embedded filename action
* 0 0 image
* 1 0 image
* 0 1 file
* 1 1 image, then fall back to file
*
* see also import_build.
*/
if( code->in &&
(import->embedded ||
!import->input_profile_filename) )
icc->in_profile = vips_icc_load_profile_image( class->nickname,
code->in );
if( !icc->in_profile &&
import->input_profile_filename )
icc->in_profile = vips_icc_load_profile_file( class->nickname,
code->in, import->input_profile_filename );
if( !icc->in_profile ) {
vips_error( class->nickname, "%s", _( "no input profile" ) );
return( -1 );
}
vips_check_intent( class->nickname,
icc->in_profile, icc->intent, LCMS_USED_AS_INPUT );
if( icc->pcs == VIPS_PCS_LAB ) {
#ifdef HAVE_LCMS2
cmsCIExyY white;
cmsWhitePointFromTemp( &white, 6500 );
icc->out_profile = cmsCreateLab4Profile( &white );
#else
icc->out_profile = cmsCreateLabProfile( NULL );
#endif
}
else
icc->out_profile = cmsCreateXYZProfile();
if( VIPS_OBJECT_CLASS( vips_icc_import_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
static void
decode_lab( guint16 *fixed, float *lab, int n )
{
int i;
for( i = 0; i < n; i++ ) {
lab[0] = (double) fixed[0] / 652.800;
lab[1] = ((double) fixed[1] / 256.0) - 128.0;
lab[2] = ((double) fixed[2] / 256.0) - 128.0;
lab += 3;
fixed += 3;
}
}
#define X_FAC (VIPS_D50_X0 * 32768 / (VIPS_D65_X0 * 100))
#define Y_FAC (VIPS_D50_Y0 * 32768 / (VIPS_D65_Y0 * 100))
#define Z_FAC (VIPS_D50_Z0 * 32768 / (VIPS_D65_Z0 * 100))
static void
decode_xyz( guint16 *fixed, float *xyz, int n )
{
int i;
for( i = 0; i < n; i++ ) {
xyz[0] = (double) fixed[0] / X_FAC;
xyz[1] = (double) fixed[1] / Y_FAC;
xyz[2] = (double) fixed[2] / Z_FAC;
xyz += 3;
fixed += 3;
}
}
/* Process a buffer of data.
*/
static void
vips_icc_import_line( VipsColour *colour,
VipsPel *out, VipsPel **in, int width )
{
VipsIcc *icc = (VipsIcc *) colour;
VipsPel *p;
float *q;
int i;
/* Buffer of encoded 16-bit pixels we transform.
*/
guint16 encoded[3 * PIXEL_BUFFER_SIZE];
p = (VipsPel *) in[0];
q = (float *) out;
for( i = 0; i < width; i += PIXEL_BUFFER_SIZE ) {
const int chunk = VIPS_MIN( width - i, PIXEL_BUFFER_SIZE );
#ifdef HAVE_LCMS2
cmsDoTransform( icc->trans, p, encoded, chunk );
#else
g_mutex_lock( icc->lock );
cmsDoTransform( icc->trans, p, encoded, chunk );
g_mutex_unlock( icc->lock );
#endif
if( icc->pcs == VIPS_PCS_LAB )
decode_lab( encoded, q, chunk );
else
decode_xyz( encoded, q, chunk );
p += PIXEL_BUFFER_SIZE * VIPS_IMAGE_SIZEOF_PEL( colour->in[0] );
q += PIXEL_BUFFER_SIZE * 3;
}
}
static void
vips_icc_import_class_init( VipsIccImportClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "icc_import";
object_class->description = _( "import from device with ICC profile" );
object_class->build = vips_icc_import_build;
colour_class->process_line = vips_icc_import_line;
VIPS_ARG_BOOL( class, "embedded", 110,
_( "Embedded" ),
_( "Use embedded input profile, if available" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIccImport, embedded ),
FALSE );
VIPS_ARG_STRING( class, "input_profile", 120,
_( "Input profile" ),
_( "Filename to load input profile from" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIccImport, input_profile_filename ),
NULL );
}
static void
vips_icc_import_init( VipsIccImport *import )
{
}
typedef struct _VipsIccExport {
VipsIcc parent_instance;
char *output_profile_filename;
} VipsIccExport;
typedef VipsIccClass VipsIccExportClass;
G_DEFINE_TYPE( VipsIccExport, vips_icc_export, VIPS_TYPE_ICC );
static int
vips_icc_export_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsColour *colour = (VipsColour *) object;
VipsColourCode *code = (VipsColourCode *) object;
VipsIcc *icc = (VipsIcc *) object;
VipsIccExport *export = (VipsIccExport *) object;
/* If icc->pcs hasn't been set and this image is tagged as XYZ, swap
* to XYZ pcs. This will save a XYZ->LAB conversion when we chain up.
*/
if( !vips_object_argument_isset( object, "pcs" ) &&
code->in &&
code->in->Type == VIPS_INTERPRETATION_XYZ )
icc->pcs = VIPS_PCS_XYZ;
if( icc->pcs == VIPS_PCS_LAB ) {
#ifdef HAVE_LCMS2
cmsCIExyY white;
cmsWhitePointFromTemp( &white, 6500 );
icc->in_profile = cmsCreateLab4Profile( &white );
#else
icc->in_profile = cmsCreateLabProfile( NULL );
#endif
}
else
icc->in_profile = cmsCreateXYZProfile();
if( code->in &&
!export->output_profile_filename &&
vips_image_get_typeof( code->in, VIPS_META_ICC_NAME ) ) {
void *data;
size_t data_length;
if( vips_image_get_blob( code->in, VIPS_META_ICC_NAME,
&data, &data_length ) ||
!(icc->out_profile = cmsOpenProfileFromMem(
data, data_length )) ) {
vips_error( class->nickname,
"%s", _( "unable to load embedded profile" ) );
return( -1 );
}
}
else if( export->output_profile_filename ) {
if( !(icc->out_profile = cmsOpenProfileFromFile(
export->output_profile_filename, "r" )) ) {
vips_error( class->nickname,
_( "unable to open profile \"%s\"" ),
export->output_profile_filename );
return( -1 );
}
colour->profile_filename = export->output_profile_filename;
}
else {
vips_error( class->nickname, "%s", _( "no output profile" ) );
return( -1 );
}
vips_check_intent( class->nickname,
icc->out_profile, icc->intent, LCMS_USED_AS_OUTPUT );
if( VIPS_OBJECT_CLASS( vips_icc_export_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
/* Pack a buffer of floats into lcms's fixed-point formats. Cut from
* lcms-1.0.8.
*/
static void
encode_lab( float *lab, guint16 *fixed, int n )
{
int i;
for( i = 0; i < n; i++ ) {
float L = lab[0];
float a = lab[1];
float b = lab[2];
if( L < 0 )
L = 0;
if( L > 100. )
L = 100.;
if( a < -128. )
a = -128;
if( a > 127.9961 )
a = 127.9961;
if( b < -128. )
b = -128;
if( b > 127.9961 )
b = 127.9961;
fixed[0] = L * 652.800 + 0.5;
fixed[1] = (a + 128.0) * 256.0 + 0.5;
fixed[2] = (b + 128.0) * 256.0 + 0.5;
lab += 3;
fixed += 3;
}
}
#define MAX_ENCODEABLE_XYZ (100 * (1.0 + 32767.0 / 32768.0))
// 1.15 fixed point for XYZ
static void
encode_xyz( float *xyz, guint16 *fixed, int n )
{
int i;
for( i = 0; i < n; i++ ) {
float X = xyz[0];
float Y = xyz[1];
float Z = xyz[2];
if( X < 0 )
X = 0;
if( X > MAX_ENCODEABLE_XYZ )
X = MAX_ENCODEABLE_XYZ;
if( Y < 0 )
Y = 0;
if( Y > MAX_ENCODEABLE_XYZ )
Y = MAX_ENCODEABLE_XYZ;
if( Z < 0 )
Z = 0;
if( Z > MAX_ENCODEABLE_XYZ )
Z = MAX_ENCODEABLE_XYZ;
fixed[0] = X * X_FAC + 0.5;
fixed[1] = Y * Y_FAC + 0.5;
fixed[2] = Z * Z_FAC + 0.5;
xyz += 3;
fixed += 3;
}
}
/* Process a buffer of data.
*/
static void
vips_icc_export_line( VipsColour *colour,
VipsPel *out, VipsPel **in, int width )
{
VipsIcc *icc = (VipsIcc *) colour;
float *p;
VipsPel *q;
int x;
/* Buffer of encoded 16-bit pixels we transform.
*/
guint16 encoded[3 * PIXEL_BUFFER_SIZE];
p = (float *) in[0];
q = (VipsPel *) out;
for( x = 0; x < width; x += PIXEL_BUFFER_SIZE ) {
const int chunk = VIPS_MIN( width - x, PIXEL_BUFFER_SIZE );
if( icc->pcs == VIPS_PCS_LAB )
encode_lab( p, encoded, chunk );
else
encode_xyz( p, encoded, chunk );
#ifdef HAVE_LCMS2
cmsDoTransform( icc->trans, encoded, q, chunk );
#else
g_mutex_lock( icc->lock );
cmsDoTransform( icc->trans, encoded, q, chunk );
g_mutex_unlock( icc->lock );
#endif
p += PIXEL_BUFFER_SIZE * 3;
q += PIXEL_BUFFER_SIZE * VIPS_IMAGE_SIZEOF_PEL( colour->out );
}
}
static void
vips_icc_export_class_init( VipsIccExportClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "icc_export";
object_class->description = _( "output to device with ICC profile" );
object_class->build = vips_icc_export_build;
colour_class->process_line = vips_icc_export_line;
VIPS_ARG_STRING( class, "output_profile", 110,
_( "Output profile" ),
_( "Filename to load output profile from" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIccExport, output_profile_filename ),
NULL );
VIPS_ARG_INT( class, "depth", 130,
_( "Depth" ),
_( "Output device space depth in bits" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsIcc, depth ),
8, 16, 8 );
}
static void
vips_icc_export_init( VipsIccExport *export )
{
}
typedef struct _VipsIccTransform {
VipsIcc parent_instance;
gboolean embedded;
char *input_profile_filename;
char *output_profile_filename;