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seems to work 

now a switch/case pair
This commit is contained in:
John Cupitt 2019-08-18 16:35:28 +01:00
parent 1734284a9a
commit daf578ca42
4 changed files with 81 additions and 75 deletions
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5
libvips/conversion/switch.c
View File

@ -119,6 +119,9 @@ vips_switch_build( VipsObject *object )
if( VIPS_OBJECT_CLASS( vips_switch_parent_class )->build( object ) )
return( -1 );
/* 255 rather than 256, since we want to reserve +1 as the no
* match value.
*/
tests = vips_area_get_data( &swit->tests->area,
NULL, &swit->n, NULL, NULL );
if( swit->n > 255 ||
@ -149,7 +152,7 @@ vips_switch_build( VipsObject *object )
/* Images must match in size and bands.
*/
if( vips__bandalike_vec( class->nickname, tests, band, swit->n, 1 ) ||
vips__sizealike_vec( band, size, swit->n + 1 ) )
vips__sizealike_vec( band, size, swit->n ) )
return( -1 );
tests = size;

144
libvips/histogram/case.c
View File

@ -46,9 +46,9 @@
typedef struct _VipsCase {
VipsOperation parent_instance;
VipsImage *in;
VipsImage *index;
VipsArrayImage *cases;
VipsImage *out;
VipsArrayImage *lut;
int n;
} VipsCase;
@ -57,8 +57,6 @@ typedef VipsOperationClass VipsCaseClass;
G_DEFINE_TYPE( VipsCase, vips_case, VIPS_TYPE_OPERATION );
/* Do a map.
*/
static int
vips_case_gen( VipsRegion *or, void *seq, void *a, void *b,
gboolean *stop )
@ -68,7 +66,7 @@ vips_case_gen( VipsRegion *or, void *seq, void *a, void *b,
VipsRect *r = &or->valid;
VipsRegion *index = ar[cas->n];
int x, y, i, j;
int x, y, i;
VipsPel * restrict ip;
VipsPel * restrict q;
size_t ils;
@ -84,20 +82,23 @@ vips_case_gen( VipsRegion *or, void *seq, void *a, void *b,
g_assert( index->im->BandFmt == VIPS_FORMAT_UCHAR );
g_assert( index->im->Bands == 1 );
/* Histogram of input region, so we know which of our inputs we will
/* Histogram of index region, so we know which of our inputs we will
* need to prepare.
*/
memset( hist, 0, 256 * sizeof( int ) );
memset( hist, 0, cas->n * sizeof( int ) );
ip = VIPS_REGION_ADDR( index, r->left, r->top );
ils = VIPS_REGION_LSKIP( index );
for( y = 0; y < r->height; y++ ) {
for( x = 0; x < r->width; x++ )
hist[ip[x]] += 1;
for( x = 0; x < r->width; x++ ) {
int v = VIPS_MIN( ip[x], cas->n - 1 );
hist[v] += 1;
}
ip += ils;
}
for( i = 0; i < 256; i++ )
for( i = 0; i < cas->n; i++ )
if( hist[i] ) {
if( vips_region_prepare( ar[i], r ) )
return( -1 );
@ -110,19 +111,24 @@ vips_case_gen( VipsRegion *or, void *seq, void *a, void *b,
qls = VIPS_REGION_LSKIP( or );
ps = VIPS_IMAGE_SIZEOF_PEL( or->im );
for( y = 0; y < r->height; y++ ) {
i = 0;
int k;
k = 0;
for( x = 0; x < r->width; x++ ) {
VipsPel * restrict pv = p[ip[x]];
int v = VIPS_MIN( ip[x], cas->n - 1 );
VipsPel * restrict pv = p[v];
int j;
for( j = 0; j < ps; j++ ) {
q[i] = pv[i];
i += 1;
q[k] = pv[k];
k += 1;
}
}
ip += ils;
q += qls;
for( i = 0; i < 256; i++ )
for( i = 0; i < cas->n; i++ )
if( hist[i] )
p[i] += ls[i];
}
@ -137,8 +143,8 @@ vips_case_build( VipsObject *object )
VipsCase *cas = (VipsCase *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
VipsImage *in;
VipsImage **lut;
VipsImage *index;
VipsImage **cases;
VipsImage **decode;
VipsImage **format;
VipsImage **band;
@ -150,24 +156,25 @@ vips_case_build( VipsObject *object )
if( VIPS_OBJECT_CLASS( vips_case_parent_class )->build( object ) )
return( -1 );
in = cas->in;
lut = vips_area_get_data( &cas->lut->area,
index = cas->index;
cases = vips_area_get_data( &cas->cases->area,
NULL, &cas->n, NULL, NULL );
if( cas->n > 256 ) {
vips_error( class->nickname, "%s", _( "LUT too large" ) );
if( cas->n > 256 ||
cas->n < 1 ) {
vips_error( class->nickname, "%s", _( "bad number of cases" ) );
return( -1 );
}
if( in->Bands > 1 ) {
if( index->Bands > 1 ) {
vips_error( class->nickname,
"%s", _( "index image not 1-band" ) );
return( -1 );
}
/* Cast @in to u8 to make the index image.
/* Cast @index to u8 to make the index image.
*/
if( vips_cast( in, &t[0], VIPS_FORMAT_UCHAR, NULL ) )
if( vips_cast( index, &t[0], VIPS_FORMAT_UCHAR, NULL ) )
return( -1 );
in = t[0];
index = t[0];
decode = (VipsImage **) vips_object_local_array( object, cas->n );
format = (VipsImage **) vips_object_local_array( object, cas->n );
@ -177,37 +184,35 @@ vips_case_build( VipsObject *object )
/* Decode RAD/LABQ etc.
*/
for( i = 0; i < cas->n; i++ )
if( vips_image_decode( lut[i], &decode[i] ) )
if( vips_image_decode( cases[i], &decode[i] ) )
return( -1 );
lut = decode;
cases = decode;
/* LUT images must match in format, size and bands.
/* case images must match in format, size and bands.
*
* We want everything sized up to the size of the index image, so add
* that to the end of the set of images for sizealike.
*/
band[cas->n] = in;
g_object_ref( in );
if( vips__formatalike_vec( lut, format, cas->n ) ||
band[cas->n] = index;
g_object_ref( index );
if( vips__formatalike_vec( cases, format, cas->n ) ||
vips__bandalike_vec( class->nickname,
format, band, cas->n, 1 ) ||
vips__sizealike_vec( band, size, cas->n + 1 ) )
return( -1 );
lut = size;
cas->out->BandFmt = lut[0]->BandFmt;
cas->out->Bands = lut[0]->Bands;
cas->out->Type = lut[0]->Type;
cas->out->Xsize = in->Xsize;
cas->out->Ysize = in->Ysize;
cases = size;
if( vips_image_pipeline_array( cas->out,
VIPS_DEMAND_STYLE_THINSTRIP, lut ) )
VIPS_DEMAND_STYLE_THINSTRIP, cases ) )
return( -1 );
cas->out->BandFmt = cases[0]->BandFmt;
cas->out->Bands = cases[0]->Bands;
cas->out->Type = cases[0]->Type;
if( vips_image_generate( cas->out,
vips_start_many, vips_case_gen, vips_stop_many,
lut, cas ) )
cases, cas ) )
return( -1 );
return( 0 );
@ -225,30 +230,30 @@ vips_case_class_init( VipsCaseClass *class )
object_class->nickname = "case";
object_class->description =
_( "use pixel values to case between a set of images" );
_( "use pixel values to pick cases from an array of images" );
object_class->build = vips_case_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input image" ),
VIPS_ARG_IMAGE( class, "index", 1,
_( "index" ),
_( "Index image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsCase, in ) );
G_STRUCT_OFFSET( VipsCase, index ) );
VIPS_ARG_IMAGE( class, "out", 2,
VIPS_ARG_BOXED( class, "cases", 2,
_( "cases" ),
_( "Array of case images" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsCase, cases ),
VIPS_TYPE_ARRAY_IMAGE );
VIPS_ARG_IMAGE( class, "out", 3,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsCase, out ) );
VIPS_ARG_BOXED( class, "lut", 3,
_( "LUT" ),
_( "Look-up table of images" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsCase, lut ),
VIPS_TYPE_ARRAY_IMAGE );
}
static void
@ -257,14 +262,14 @@ vips_case_init( VipsCase *cas )
}
static int
vips_casev( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
vips_casev( VipsImage *index, VipsImage **cases, VipsImage **out, int n,
va_list ap )
{
VipsArrayImage *array;
int result;
array = vips_array_image_new( lut, n );
result = vips_call_split( "case", ap, in, out, array );
array = vips_array_image_new( cases, n );
result = vips_call_split( "case", ap, index, array, out );
vips_area_unref( VIPS_AREA( array ) );
return( result );
@ -272,24 +277,21 @@ vips_casev( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
/**
* vips_case: (method)
* @in: input image
* @index: index image
* @cases: (array length=n): array of case images
* @out: (out): output image
* @lut: (array length=n): LUT of input images
* @n: number of input images
* @n: number of case images
* @...: %NULL-terminated list of optional named arguments
*
* Use pixel values to pick cases from an array of images.
* Use values in @index to select pixels from @cases.
*
* Each value in @in is used to select an image from @lut, and the
* corresponding pixel is copied to the output.
* @index must have one band. @cases can have up to 256 elements. Values in
* @index greater than or equal to @n use the final image in @cases. The
* images in @cases must have either one band or the same number of bands.
* The output image is the same size as @index. Images in @cases are
* expanded to the smallest common format and number of bands.
*
* @in must have one band. @lut can have up to 256 elements. Values in @in
* greater than or equal to @n use the final image in @lut. The images in @lut
* must have either one band or the same number of bands. The output image is
* the same size as @in. Images in @lut are expanded to the smallest common
* format and number of bands.
*
* Combine this with vips_switch() to make something like a case statement, or
* Combine this with vips_switch() to make something like a case statement or
* a multi-way vips_ifthenelse().
*
* See also: vips_maplut(), vips_switch(), vips_ifthenelse().
@ -297,13 +299,13 @@ vips_casev( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
* Returns: 0 on success, -1 on error
*/
int
vips_case( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
vips_case( VipsImage *index, VipsImage **cases, VipsImage **out, int n, ... )
{
va_list ap;
int result;
va_start( ap, n );
result = vips_casev( in, out, lut, n, ap );
result = vips_casev( index, cases, out, n, ap );
va_end( ap );
return( result );

4
libvips/histogram/histogram.c
View File

@ -251,7 +251,7 @@ void
vips_histogram_operation_init( void )
{
extern GType vips_maplut_get_type( void );
extern GType vips_switch_get_type( void );
extern GType vips_case_get_type( void );
extern GType vips_percent_get_type( void );
extern GType vips_hist_cum_get_type( void );
extern GType vips_hist_norm_get_type( void );
@ -264,7 +264,7 @@ vips_histogram_operation_init( void )
extern GType vips_stdif_get_type( void );
vips_maplut_get_type();
vips_switch_get_type();
vips_case_get_type();
vips_percent_get_type();
vips_stdif_get_type();
vips_hist_cum_get_type();

3
libvips/include/vips/histogram.h
View File

@ -64,7 +64,8 @@ int vips_hist_ismonotonic( VipsImage *in, gboolean *out, ... )
int vips_hist_entropy( VipsImage *in, double *out, ... )
__attribute__((sentinel));
int vips_case( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
int vips_case( VipsImage *index, VipsImage **cases, VipsImage **out, int n,
... )
__attribute__((sentinel));
#ifdef __cplusplus