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redo im_XYZ2Lab() as a class

This commit is contained in:
John Cupitt 2012-09-20 09:18:52 +01:00
parent e0fcc2c517
commit e688bf29b6
9 changed files with 321 additions and 231 deletions
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4
ChangeLog
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@ -1,6 +1,6 @@
31/8/12 started 7.31.0
- redone im_Lab2XYZ(), im_Lab2LCh(), im_LCh2Lab(), im_UCS2LCh, im_LCh2UCS()
as classes
- redone im_Lab2XYZ(), im_XYZ2Lab(), im_Lab2LCh(), im_LCh2Lab(), im_UCS2LCh,
im_LCh2UCS() as classes
13/9/12 started 7.30.3
- linecache sized itself too large

6
libvips/colour/Lab2XYZ.c
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@ -236,9 +236,9 @@ vips_col_Lab2XYZ( float L, float a, float b, float *X, float *Y, float *Z )
in[0] = L;
in[1] = a;
in[2] = b;
Lab2XYZ.X0 = IM_D65_X0;
Lab2XYZ.Y0 = IM_D65_Y0;
Lab2XYZ.Z0 = IM_D65_Z0;
Lab2XYZ.X0 = VIPS_D65_X0;
Lab2XYZ.Y0 = VIPS_D65_Y0;
Lab2XYZ.Z0 = VIPS_D65_Z0;
vips_Lab2XYZ_line( (VipsColour *) &Lab2XYZ,
(VipsPel *) out, (VipsPel **) &in, 1 );
*X = out[0];

2
libvips/colour/Makefile.am
View File

@ -11,6 +11,7 @@ libcolour_la_SOURCES = \
LCh2Lab.c \
LCh2UCS.c \
UCS2LCh.c \
XYZ2Lab.c \
im_icc_transform.c \
im_Lab2LabQ.c \
im_Lab2LabS.c \
@ -20,7 +21,6 @@ libcolour_la_SOURCES = \
im_LabS2LabQ.c \
im_LabS2Lab.c \
im_lab_morph.c \
im_XYZ2Lab.c \
im_XYZ2Yxy.c \
im_float2rad.c \
im_Yxy2XYZ.c \

265
libvips/colour/XYZ2Lab.c Normal file
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@ -0,0 +1,265 @@
/* Turn XYZ to Lab colourspace.
*
* Modifed:
* 16/11/94 JC
* - uses im_wrapone()
* - in-line conversion
* 27/1/03 JC
* - swapped cbrt() for pow(), more portable
* 12/11/04
* - swapped pow() for cbrt() again, pow() is insanely slow on win32
* - added a configure test for cbrt().
* 23/11/04
* - use a large LUT instead, about 5x faster
* 23/11/06
* - ahem, build the LUT outside the eval thread
* 2/11/09
* - gtkdoc
* 3/8/11
* - fix a race in the table build
* 19/9/12
* - redone as a class
*/
/*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include "colour.h"
#ifndef HAVE_CBRT
#define cbrt( X ) pow( (X), 1.0 / 3.0 )
#endif /*!HAVE_CBRT*/
/* Lookup table size.
*/
#define QUANT_ELEMENTS (100000)
float cbrt_table[QUANT_ELEMENTS];
typedef struct _VipsXYZ2Lab {
VipsColorimetric parent_instance;
/* The colour temperature -- default to D65.
*/
VipsArea *temp;
/* Broken out as xyz.
*/
double X0;
double Y0;
double Z0;
} VipsXYZ2Lab;
typedef VipsColorimetricClass VipsXYZ2LabClass;
G_DEFINE_TYPE( VipsXYZ2Lab, vips_XYZ2Lab, VIPS_TYPE_COLORIMETRIC );
static void *
table_init( void *client )
{
int i;
for( i = 0; i < QUANT_ELEMENTS; i++ ) {
float Y = (double) i / QUANT_ELEMENTS;
if( Y < 0.008856 )
cbrt_table[i] = 7.787 * Y + (16.0 / 116.0);
else
cbrt_table[i] = cbrt( Y );
}
return( NULL );
}
static void
vips_XYZ2Lab_make_tables( void )
{
static GOnce once = G_ONCE_INIT;
(void) g_once( &once, table_init, NULL );
}
/* Process a buffer of data.
*/
static void
vips_XYZ2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
{
VipsXYZ2Lab *XYZ2Lab = (VipsXYZ2Lab *) colour;
float *p = (float *) in[0];
float *q = (float *) out;
int x;
vips_XYZ2Lab_make_tables();
for( x = 0; x < width; x++ ) {
float nX, nY, nZ;
int i;
float f;
float cbx, cby, cbz;
nX = QUANT_ELEMENTS * p[0] / XYZ2Lab->X0;
nY = QUANT_ELEMENTS * p[1] / XYZ2Lab->Y0;
nZ = QUANT_ELEMENTS * p[2] / XYZ2Lab->Z0;
p += 3;
i = VIPS_CLIP( 0, (int) nX, QUANT_ELEMENTS - 2 );
f = nX - i;
cbx = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
i = VIPS_CLIP( 0, (int) nY, QUANT_ELEMENTS - 2 );
f = nY - i;
cby = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
i = VIPS_CLIP( 0, (int) nZ, QUANT_ELEMENTS - 2 );
f = nZ - i;
cbz = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
q[0] = 116.0 * cby - 16.0;
q[1] = 500.0 * (cbx - cby);
q[2] = 200.0 * (cby - cbz);
q += 3;
}
}
/**
* vips_col_XYZ2Lab:
* @X: Input CIE XYZ colour
* @Y: Input CIE XYZ colour
* @Z: Input CIE XYZ colour
* @L: Return CIE Lab value
* @a: Return CIE Lab value
* @b: Return CIE Lab value
*
* Calculate XYZ from Lab, D65.
*
* See also: vips_XYZ2Lab().
*/
void
vips_col_XYZ2Lab( float X, float Y, float Z, float *L, float *a, float *b )
{
float in[3], out[3];
VipsXYZ2Lab XYZ2Lab;
in[0] = X;
in[1] = Y;
in[2] = Z;
XYZ2Lab.X0 = VIPS_D65_X0;
XYZ2Lab.Y0 = VIPS_D65_Y0;
XYZ2Lab.Z0 = VIPS_D65_Z0;
vips_XYZ2Lab_line( (VipsColour *) &XYZ2Lab,
(VipsPel *) out, (VipsPel **) &in, 1 );
*L = out[0];
*a = out[1];
*b = out[2];
}
static int
vips_XYZ2Lab_build( VipsObject *object )
{
VipsXYZ2Lab *XYZ2Lab = (VipsXYZ2Lab *) object;
if( XYZ2Lab->temp ) {
if( vips_check_vector_length( "VipsXYZ2Lab",
XYZ2Lab->temp->n, 3 ) )
return( -1 );
XYZ2Lab->X0 = ((double *) XYZ2Lab->temp->data)[0];
XYZ2Lab->Y0 = ((double *) XYZ2Lab->temp->data)[1];
XYZ2Lab->Z0 = ((double *) XYZ2Lab->temp->data)[2];
}
if( VIPS_OBJECT_CLASS( vips_XYZ2Lab_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
static void
vips_XYZ2Lab_class_init( VipsXYZ2LabClass *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 = "XYZ2Lab";
object_class->description = _( "transform XYZ to Lab" );
object_class->build = vips_XYZ2Lab_build;
colour_class->process_line = vips_XYZ2Lab_line;
colour_class->interpretation = VIPS_INTERPRETATION_LAB;
VIPS_ARG_BOXED( class, "temp", 110,
_( "Temperature" ),
_( "Colour temperature" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsXYZ2Lab, temp ),
VIPS_TYPE_ARRAY_DOUBLE );
}
static void
vips_XYZ2Lab_init( VipsXYZ2Lab *XYZ2Lab )
{
XYZ2Lab->X0 = VIPS_D65_X0;
XYZ2Lab->Y0 = VIPS_D65_Y0;
XYZ2Lab->Z0 = VIPS_D65_Z0;
}
/**
* vips_XYZ2Lab:
* @in: input image
* @out: output image
*
* Turn XYZ to D65 Lab.
*
* Returns: 0 on success, -1 on error.
*/
int
vips_XYZ2Lab( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "XYZ2Lab", ap, in, out );
va_end( ap );
return( result );
}

31
libvips/colour/colour_funcs.c
View File

@ -67,37 +67,6 @@
#include <vips/vips.h>
#include <vips/internal.h>
/**
* im_col_XYZ2Lab:
* @X: Input CIE XYZ colour
* @Y: Input CIE XYZ colour
* @Z: Input CIE XYZ colour
* @L: return CIE Lab value
* @a: return CIE Lab value
* @b: return CIE Lab value
*
* Calculate Lab from XYZ, D65.
*
* See also: im_XYZ2Lab_temp().
*/
void
im_col_XYZ2Lab( float X, float Y, float Z, float *L, float *a, float *b )
{
float in[3], out[3];
im_colour_temperature temp;
in[0] = X;
in[1] = Y;
in[2] = Z;
temp.X0 = IM_D65_X0;
temp.Y0 = IM_D65_Y0;
temp.Z0 = IM_D65_Z0;
imb_XYZ2Lab( in, out, 1, &temp );
*L = out[0];
*a = out[1];
*b = out[2];
}
/**
* im_col_pythagoras:
* @L1: Input coordinate 1

189
libvips/colour/im_XYZ2Lab.c
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@ -1,189 +0,0 @@
/* Turn XYZ to Lab colourspace.
*
* Modifed:
* 16/11/94 JC
* - uses im_wrapone()
* - in-line conversion
* 27/1/03 JC
* - swapped cbrt() for pow(), more portable
* 12/11/04
* - swapped pow() for cbrt() again, pow() is insanely slow on win32
* - added a configure test for cbrt().
* 23/11/04
* - use a large LUT instead, about 5x faster
* 23/11/06
* - ahem, build the LUT outside the eval thread
* 2/11/09
* - gtkdoc
* 3/8/11
* - fix a race in the table build
*/
/*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/thread.h>
#include <vips/internal.h>
#ifndef HAVE_CBRT
#define cbrt( X ) pow( (X), 1.0 / 3.0 )
#endif /*!HAVE_CBRT*/
/* Lookup table size.
*/
#define QUANT_ELEMENTS (100000)
float cbrt_table[QUANT_ELEMENTS];
static void
imb_XYZ2Lab_tables( void )
{
static int built_tables = 0;
int i;
g_mutex_lock( im__global_lock );
if( built_tables ) {
g_mutex_unlock( im__global_lock );
return;
}
for( i = 0; i < QUANT_ELEMENTS; i++ ) {
float Y = (double) i / QUANT_ELEMENTS;
if( Y < 0.008856 )
cbrt_table[i] = 7.787 * Y + (16.0 / 116.0);
else
cbrt_table[i] = cbrt( Y );
}
built_tables = 1;
g_mutex_unlock( im__global_lock );
}
/* Process a buffer of data.
*/
void
imb_XYZ2Lab( float *p, float *q, int n, im_colour_temperature *temp )
{
int x;
imb_XYZ2Lab_tables();
for( x = 0; x < n; x++ ) {
float nX, nY, nZ;
int i;
float f;
float cbx, cby, cbz;
nX = QUANT_ELEMENTS * p[0] / temp->X0;
nY = QUANT_ELEMENTS * p[1] / temp->Y0;
nZ = QUANT_ELEMENTS * p[2] / temp->Z0;
p += 3;
i = (int) nX;
if( i < 0 )
i = 0;
if( i > QUANT_ELEMENTS - 2 )
i = QUANT_ELEMENTS - 2;
f = nX - i;
cbx = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
i = (int) nY;
if( i < 0 )
i = 0;
if( i > QUANT_ELEMENTS - 2 )
i = QUANT_ELEMENTS - 2;
f = nY - i;
cby = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
i = (int) nZ;
if( i < 0 )
i = 0;
if( i > QUANT_ELEMENTS - 2 )
i = QUANT_ELEMENTS - 2;
f = nZ - i;
cbz = cbrt_table[i] + f * (cbrt_table[i + 1] - cbrt_table[i]);
q[0] = 116.0 * cby - 16.0;
q[1] = 500.0 * (cbx - cby);
q[2] = 200.0 * (cby - cbz);
q += 3;
}
}
/**
* im_XYZ2Lab_temp:
* @in: input image
* @out: output image
* @X0: colour temperature
* @Y0: colour temperature
* @Z0: colour temperature
*
* Turn XYZ to Lab. @X0, @y0, @Z0 give the Lab colour temperature.
*
* Returns: 0 on success, -1 on error.
*/
int
im_XYZ2Lab_temp( IMAGE *in, IMAGE *out, double X0, double Y0, double Z0 )
{
im_colour_temperature *temp;
if( !(temp = IM_NEW( out, im_colour_temperature )) )
return( -1 );
temp->X0 = X0;
temp->Y0 = Y0;
temp->Z0 = Z0;
return( im__colour_unary( "im_XYZ2Lab", in, out, IM_TYPE_LAB,
(im_wrapone_fn) imb_XYZ2Lab, temp, NULL ) );
}
/**
* im_XYZ2Lab:
* @in: input image
* @out: output image
*
* Turn XYZ to D65 Lab.
*
* Returns: 0 on success, -1 on error.
*/
int
im_XYZ2Lab( IMAGE *in, IMAGE *out )
{
return( im_XYZ2Lab_temp( in, out, IM_D65_X0, IM_D65_Y0, IM_D65_Z0 ) );
}

42
libvips/deprecated/vips7compat.c
View File

@ -2186,6 +2186,48 @@ im_Lab2XYZ( IMAGE *in, IMAGE *out )
return( 0 );
}
int
im_XYZ2Lab_temp( IMAGE *in, IMAGE *out, double X0, double Y0, double Z0 )
{
double ary[3];
VipsArea *temp;
VipsImage *x;
ary[0] = X0;
ary[1] = Y0;
ary[2] = Z0;
temp = (VipsArea *) vips_array_double_new( ary, 3 );
if( vips_XYZ2Lab( in, &x, "temp", temp, NULL ) ) {
vips_area_unref( temp );
return( -1 );
}
vips_area_unref( temp );
if( im_copy( x, out ) ) {
g_object_unref( x );
return( -1 );
}
g_object_unref( x );
return( 0 );
}
int
im_XYZ2Lab( IMAGE *in, IMAGE *out )
{
VipsImage *x;
if( vips_XYZ2Lab( in, &x, NULL ) )
return( -1 );
if( im_copy( x, out ) ) {
g_object_unref( x );
return( -1 );
}
g_object_unref( x );
return( 0 );
}
int
im_Lab2LCh( IMAGE *in, IMAGE *out )
{

9
libvips/include/vips/colour.h
View File

@ -117,6 +117,8 @@ int vips_UCS2XYZ( VipsImage *in, VipsImage **out, ... )
__attribute__((sentinel));
int vips_Lab2XYZ( VipsImage *in, VipsImage **out, ... )
__attribute__((sentinel));
int vips_XYZ2Lab( VipsImage *in, VipsImage **out, ... )
__attribute__((sentinel));
int vips_XYZ2disp( VipsImage *in, VipsImage **out,
struct im_col_display *disp, ... )
__attribute__((sentinel));
@ -127,6 +129,8 @@ int vips_UCS2LCh( VipsImage *in, VipsImage **out, ... )
void vips_col_Lab2XYZ( float L, float a, float b,
float *X, float *Y, float *Z );
void vips_col_XYZ2Lab( float X, float Y, float Z,
float *L, float *a, float *b );
double vips_col_ab2h( double a, double b );
void vips_col_ab2Ch( float a, float b, float *C, float *h );
void vips_col_Ch2ab( float C, float h, float *a, float *b );
@ -146,8 +150,6 @@ float vips_col_Chucs2h( float C, float hucs );
/* Colour loading and conversion functions.
*/
void im_col_ab2Ch( float a, float b, float *C, float *h );
void im_col_XYZ2Lab( float X, float Y, float Z, float *L, float *a, float *b );
float im_col_pythagoras( float L1, float a1, float b1,
float L2, float a2, float b2 );
@ -169,9 +171,6 @@ int im_LabS2Lab( VipsImage *in, VipsImage *out );
int im_UCS2XYZ( VipsImage *in, VipsImage *out );
int im_UCS2Lab( VipsImage *in, VipsImage *out );
int im_Lab2UCS( VipsImage *in, VipsImage *out );
int im_XYZ2Lab( VipsImage *in, VipsImage *out );
int im_XYZ2Lab_temp( VipsImage *in, VipsImage *out,
double X0, double Y0, double Z0 );
int im_XYZ2UCS( VipsImage *in, VipsImage *out );
int im_sRGB2XYZ( VipsImage *in, VipsImage *out );
int im_XYZ2sRGB( VipsImage *in, VipsImage *out );

4
libvips/include/vips/vips7compat.h
View File

@ -81,6 +81,7 @@ extern "C" {
#define IM_D3250_Z0 VIPS_D3250_Z0
#define im_col_Lab2XYZ vips_col_Lab2XYZ
#define im_col_XYZ2Lab vips_col_XYZ2Lab
#define im_col_ab2h vips_col_ab2h
#define im_col_ab2Ch vips_col_ab2Ch
#define im_col_Ch2ab vips_col_Ch2ab
@ -708,6 +709,9 @@ int im_shrink( VipsImage *in, VipsImage *out, double xshrink, double yshrink );
int im_Lab2XYZ_temp( IMAGE *in, IMAGE *out, double X0, double Y0, double Z0 );
int im_Lab2XYZ( IMAGE *in, IMAGE *out );
int im_XYZ2Lab( VipsImage *in, VipsImage *out );
int im_XYZ2Lab_temp( VipsImage *in, VipsImage *out,
double X0, double Y0, double Z0 );
int im_Lab2LCh( VipsImage *in, VipsImage *out );
int im_LCh2Lab( VipsImage *in, VipsImage *out );
int im_LCh2UCS( VipsImage *in, VipsImage *out );