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Merge pull request #915 from harukizaemon/region-shrink-method 

WIP: Adds a region shrink method
This commit is contained in:
John Cupitt 2018-06-13 17:15:03 +01:00 committed by GitHub
parent 539cc0616c 2c7684669f
commit 8a8a093523
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 262 additions and 34 deletions
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22
libvips/foreign/dzsave.c
View File

@ -447,6 +447,7 @@ struct _VipsForeignSaveDz {
VipsAngle angle;
VipsForeignDzContainer container;
int compression;
VipsRegionShrink region_shrink;
/* Tile and overlap geometry. The members above are the parameters we
* accept, this next set are the derived values which are actually
@ -1355,6 +1356,8 @@ strip_shrink( Layer *layer )
Layer *below = layer->below;
VipsRegion *from = layer->strip;
VipsRegion *to = below->strip;
VipsForeignSaveDz *dz = layer->dz;
VipsRegionShrink region_shrink = dz->region_shrink;
VipsRect target;
VipsRect source;
@ -1401,10 +1404,11 @@ strip_shrink( Layer *layer )
/* None? All done.
*/
if( vips_rect_isempty( &target ) )
if( vips_rect_isempty( &target ) )
break;
(void) vips_region_shrink( from, to, &target );
(void) vips_region_shrink( from, to, &target,
region_shrink );
below->write_y += target.height;
@ -2098,6 +2102,14 @@ vips_foreign_save_dz_class_init( VipsForeignSaveDzClass *class )
G_STRUCT_OFFSET( VipsForeignSaveDz, compression ),
-1, 9, 0 );
VIPS_ARG_ENUM( class, "region_shrink", 18,
_( "Region shrink" ),
_( "Method for blah" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSaveDz, region_shrink ),
VIPS_TYPE_REGION_SHRINK,
VIPS_REGION_SHRINK_MEAN );
/* How annoying. We stupidly had these in earlier versions.
*/
@ -2136,6 +2148,7 @@ vips_foreign_save_dz_init( VipsForeignSaveDz *dz )
dz->angle = VIPS_ANGLE_D0;
dz->container = VIPS_FOREIGN_DZ_CONTAINER_FS;
dz->compression = 0;
dz->region_shrink = VIPS_REGION_SHRINK_MEAN;
}
typedef struct _VipsForeignSaveDzFile {
@ -2332,6 +2345,7 @@ vips_foreign_save_dz_buffer_init( VipsForeignSaveDzBuffer *buffer )
* * @container: #VipsForeignDzContainer set container type
* * @properties: %gboolean write a properties file
* * @compression: %gint zip deflate compression level
* * @shrink_region: #VipsRegionShrink How to shrink each 2x2 region.
*
* Save an image as a set of tiles at various resolutions. By default dzsave
* uses DeepZoom layout -- use @layout to pick other conventions.
@ -2375,6 +2389,10 @@ vips_foreign_save_dz_buffer_init( VipsForeignSaveDzBuffer *buffer )
* (use zlib default), 0 (store, compression disabled) to 9 (max compression).
* If no value is given, the default is to store files without compression.
*
* You can use @region_shrink to control the method for shrinking each 2x2
* region. This defaults to using the average of the 4 input pixels but you can
* also use the median in cases where you want to preseve the range of values.
*
* See also: vips_tiffsave().
*
* Returns: 0 on success, -1 on error.

5
libvips/foreign/vips2tiff.c
View File

@ -1389,10 +1389,11 @@ layer_strip_shrink( Layer *layer )
/* None? All done.
*/
if( vips_rect_isempty( &target ) )
if( vips_rect_isempty( &target ) )
break;
(void) vips_region_shrink( from, to, &target );
(void) vips_region_shrink( from, to, &target,
VIPS_REGION_SHRINK_MEAN );
below->write_y += target.height;

3
libvips/include/vips/Makefile.am
View File

@ -72,7 +72,8 @@ vips_scan_headers = \
${top_srcdir}/libvips/include/vips/morphology.h \
${top_srcdir}/libvips/include/vips/draw.h \
${top_srcdir}/libvips/include/vips/basic.h \
${top_srcdir}/libvips/include/vips/object.h
${top_srcdir}/libvips/include/vips/object.h \
${top_srcdir}/libvips/include/vips/region.h
enumtypes.h: $(vips_scan_headers) Makefile.am
glib-mkenums --template enumtemplate $(vips_scan_headers) > enumtypes.h

24
libvips/include/vips/region.h
View File

@ -55,6 +55,21 @@ extern "C" {
(G_TYPE_INSTANCE_GET_CLASS( (obj), \
VIPS_TYPE_REGION, VipsRegionClass ))
/**
* VipsRegionShrink:
* @VIPS_REGION_SHRINK_MEAN: use the average
* @VIPS_REGION_SHRINK_MEDIAN: use the median
* @VIPS_REGION_SHRINK_MODE: use the mode
*
* How to calculate the output pixels when shrinking a 2x2 region.
*/
typedef enum {
VIPS_REGION_SHRINK_MEAN,
VIPS_REGION_SHRINK_MEDIAN,
VIPS_REGION_SHRINK_MODE,
VIPS_REGION_SHRINK_LAST
} VipsRegionShrink;
/* Sub-area of image.
*/
typedef struct _VipsRegion {
@ -115,13 +130,14 @@ void vips_region_paint( VipsRegion *reg, const VipsRect *r, int value );
void vips_region_paint_pel( VipsRegion *reg,
const VipsRect *r, const VipsPel *ink );
void vips_region_black( VipsRegion *reg );
void vips_region_copy( VipsRegion *reg, VipsRegion *dest,
void vips_region_copy( VipsRegion *reg, VipsRegion *dest,
const VipsRect *r, int x, int y );
int vips_region_shrink( VipsRegion *from,
VipsRegion *to, const VipsRect *target );
int vips_region_shrink( VipsRegion *from,
VipsRegion *to, const VipsRect *target,
VipsRegionShrink method );
int vips_region_prepare( VipsRegion *reg, const VipsRect *r );
int vips_region_prepare_to( VipsRegion *reg,
int vips_region_prepare_to( VipsRegion *reg,
VipsRegion *dest, const VipsRect *r, int x, int y );
void vips_region_invalidate( VipsRegion *reg );

3
libvips/iofuncs/Makefile.am
View File

@ -70,7 +70,8 @@ vips_scan_headers = \
${top_srcdir}/libvips/include/vips/morphology.h \
${top_srcdir}/libvips/include/vips/draw.h \
${top_srcdir}/libvips/include/vips/basic.h \
${top_srcdir}/libvips/include/vips/object.h
${top_srcdir}/libvips/include/vips/object.h \
${top_srcdir}/libvips/include/vips/region.h
enumtypes.c: $(vips_scan_headers) Makefile.am
glib-mkenums --template enumtemplate $(vips_scan_headers) > enumtypes.c

20
libvips/iofuncs/enumtypes.c
View File

@ -866,6 +866,26 @@ vips_operation_flags_get_type( void )
return( etype );
}
/* enumerations from "../../libvips/include/vips/region.h" */
GType
vips_region_shrink_get_type( void )
{
static GType etype = 0;
if( etype == 0 ) {
static const GEnumValue values[] = {
{VIPS_REGION_SHRINK_MEAN, "VIPS_REGION_SHRINK_MEAN", "mean"},
{VIPS_REGION_SHRINK_MEDIAN, "VIPS_REGION_SHRINK_MEDIAN", "median"},
{VIPS_REGION_SHRINK_MODE, "VIPS_REGION_SHRINK_MODE", "mode"},
{VIPS_REGION_SHRINK_LAST, "VIPS_REGION_SHRINK_LAST", "last"},
{0, NULL, NULL}
};
etype = g_enum_register_static( "VipsRegionShrink", values );
}
return( etype );
}
/* enumerations from "../../libvips/include/vips/resample.h" */
GType
vips_kernel_get_type( void )

219
libvips/iofuncs/region.c
View File

@ -1166,7 +1166,7 @@ vips_region_shrink_labpack( VipsRegion *from,
}
}
#define SHRINK_TYPE_INT( TYPE ) \
#define SHRINK_TYPE_MEAN_INT( TYPE ) \
for( x = 0; x < target->width; x++ ) { \
TYPE *tp = (TYPE *) p; \
TYPE *tp1 = (TYPE *) (p + ls); \
@ -1185,7 +1185,7 @@ vips_region_shrink_labpack( VipsRegion *from,
q += ps; \
}
#define SHRINK_TYPE_FLOAT( TYPE ) \
#define SHRINK_TYPE_MEAN_FLOAT( TYPE ) \
for( x = 0; x < target->width; x++ ) { \
TYPE *tp = (TYPE *) p; \
TYPE *tp1 = (TYPE *) (p + ls); \
@ -1204,10 +1204,69 @@ vips_region_shrink_labpack( VipsRegion *from,
q += ps; \
}
/* This method is implemented so as to perform well and to always select an
* output pixel from one of the input pixels. As such we make only the
* following guarantees:
*
* ONLY works for non-complex uncoded images pixel types
* ALWAYS draws from the input values
* NEVER interpolates
* NOT stable with respect to the ordered set of input values
* IS stable with respect to the initial arrangement of input values
*/
#define SHRINK_TYPE_MEDIAN( TYPE ) \
for( x = 0; x < target->width; x++ ) { \
TYPE *tp = (TYPE *) p; \
TYPE *tp1 = (TYPE *) (p + ls); \
TYPE *tq = (TYPE *) q; \
\
for( z = 0; z < nb; z++ ) { \
tq[z] = VIPS_MIN( \
VIPS_MAX( tp[z], tp[z + nb] ), \
VIPS_MAX( tp1[z], tp1[z + nb] ) \
); \
} \
\
/* Move on two pels in input. \
*/ \
p += ps << 1; \
q += ps; \
}
/* This method is implemented so as to perform well and to always select an
* output pixel from one of the input pixels. As such we make only the
* following guarantees:
*
* ONLY works for non-complex uncoded images pixel types
* ALWAYS draws from the input values
* NEVER interpolates
* NOT stable with respect to the ordered set of input values
* IS stable with respect to the initial arrangement of input values
*/
#define SHRINK_TYPE_MODE( TYPE ) \
for( x = 0; x < target->width; x++ ) { \
TYPE *tp = (TYPE *) p; \
TYPE *tp1 = (TYPE *) (p + ls); \
TYPE *tq = (TYPE *) q; \
\
for( z = 0; z < nb; z++ ) { \
TYPE v[] = {tp[z], tp[z + nb], tp1[z], tp1[z + nb]}; \
int b0 = (v[0] == v[1]) | (v[0] == v[2]) | (v[0] == v[3]); \
int b1 = (v[1] == v[0]) | (v[1] == v[2]) | (v[1] == v[3]); \
int index = ((~b0) & 0x1) + (~(b0 ^ b1) & 0x1); \
tq[z] = v[index]; \
} \
\
/* Move on two pels in input. \
*/ \
p += ps << 1; \
q += ps; \
}
/* Generate area @target in @to using pixels in @from. Non-complex.
*/
static void
vips_region_shrink_uncoded( VipsRegion *from,
vips_region_shrink_uncoded_mean( VipsRegion *from,
VipsRegion *to, const VipsRect *target )
{
int ls = VIPS_REGION_LSKIP( from );
@ -1225,22 +1284,22 @@ vips_region_shrink_uncoded( VipsRegion *from,
/* Process this line of pels.
*/
switch( from->im->BandFmt ) {
case VIPS_FORMAT_UCHAR:
SHRINK_TYPE_INT( unsigned char ); break;
case VIPS_FORMAT_CHAR:
SHRINK_TYPE_INT( signed char ); break;
case VIPS_FORMAT_USHORT:
SHRINK_TYPE_INT( unsigned short ); break;
case VIPS_FORMAT_SHORT:
SHRINK_TYPE_INT( signed short ); break;
case VIPS_FORMAT_UINT:
SHRINK_TYPE_INT( unsigned int ); break;
case VIPS_FORMAT_INT:
SHRINK_TYPE_INT( signed int ); break;
case VIPS_FORMAT_FLOAT:
SHRINK_TYPE_FLOAT( float ); break;
case VIPS_FORMAT_DOUBLE:
SHRINK_TYPE_FLOAT( double ); break;
case VIPS_FORMAT_UCHAR:
SHRINK_TYPE_MEAN_INT( unsigned char ); break;
case VIPS_FORMAT_CHAR:
SHRINK_TYPE_MEAN_INT( signed char ); break;
case VIPS_FORMAT_USHORT:
SHRINK_TYPE_MEAN_INT( unsigned short ); break;
case VIPS_FORMAT_SHORT:
SHRINK_TYPE_MEAN_INT( signed short ); break;
case VIPS_FORMAT_UINT:
SHRINK_TYPE_MEAN_INT( unsigned int ); break;
case VIPS_FORMAT_INT:
SHRINK_TYPE_MEAN_INT( signed int ); break;
case VIPS_FORMAT_FLOAT:
SHRINK_TYPE_MEAN_FLOAT( float ); break;
case VIPS_FORMAT_DOUBLE:
SHRINK_TYPE_MEAN_FLOAT( double ); break;
default:
g_assert_not_reached();
@ -1248,6 +1307,116 @@ vips_region_shrink_uncoded( VipsRegion *from,
}
}
/* Generate area @target in @to using pixels in @from. Non-complex.
*/
static void
vips_region_shrink_uncoded_median( VipsRegion *from,
VipsRegion *to, const VipsRect *target )
{
int ls = VIPS_REGION_LSKIP( from );
int ps = VIPS_IMAGE_SIZEOF_PEL( from->im );
int nb = from->im->Bands;
int x, y, z;
for( y = 0; y < target->height; y++ ) {
VipsPel *p = VIPS_REGION_ADDR( from,
target->left * 2, (target->top + y) * 2 );
VipsPel *q = VIPS_REGION_ADDR( to,
target->left, target->top + y );
/* Process this line of pels.
*/
switch( from->im->BandFmt ) {
case VIPS_FORMAT_UCHAR:
SHRINK_TYPE_MEDIAN( unsigned char ); break;
case VIPS_FORMAT_CHAR:
SHRINK_TYPE_MEDIAN( signed char ); break;
case VIPS_FORMAT_USHORT:
SHRINK_TYPE_MEDIAN( unsigned short ); break;
case VIPS_FORMAT_SHORT:
SHRINK_TYPE_MEDIAN( signed short ); break;
case VIPS_FORMAT_UINT:
SHRINK_TYPE_MEDIAN( unsigned int ); break;
case VIPS_FORMAT_INT:
SHRINK_TYPE_MEDIAN( signed int ); break;
case VIPS_FORMAT_FLOAT:
SHRINK_TYPE_MEDIAN( float ); break;
case VIPS_FORMAT_DOUBLE:
SHRINK_TYPE_MEDIAN( double ); break;
default:
g_assert_not_reached();
}
}
}
/* Generate area @target in @to using pixels in @from. Non-complex.
*/
static void
vips_region_shrink_uncoded_mode( VipsRegion *from,
VipsRegion *to, const VipsRect *target )
{
int ls = VIPS_REGION_LSKIP( from );
int ps = VIPS_IMAGE_SIZEOF_PEL( from->im );
int nb = from->im->Bands;
int x, y, z;
for( y = 0; y < target->height; y++ ) {
VipsPel *p = VIPS_REGION_ADDR( from,
target->left * 2, (target->top + y) * 2 );
VipsPel *q = VIPS_REGION_ADDR( to,
target->left, target->top + y );
/* Process this line of pels.
*/
switch( from->im->BandFmt ) {
case VIPS_FORMAT_UCHAR:
SHRINK_TYPE_MODE( unsigned char ); break;
case VIPS_FORMAT_CHAR:
SHRINK_TYPE_MODE( signed char ); break;
case VIPS_FORMAT_USHORT:
SHRINK_TYPE_MODE( unsigned short ); break;
case VIPS_FORMAT_SHORT:
SHRINK_TYPE_MODE( signed short ); break;
case VIPS_FORMAT_UINT:
SHRINK_TYPE_MODE( unsigned int ); break;
case VIPS_FORMAT_INT:
SHRINK_TYPE_MODE( signed int ); break;
case VIPS_FORMAT_FLOAT:
SHRINK_TYPE_MODE( float ); break;
case VIPS_FORMAT_DOUBLE:
SHRINK_TYPE_MODE( double ); break;
default:
g_assert_not_reached();
}
}
}
/* Generate area @target in @to using pixels in @from. Non-complex.
*/
static void
vips_region_shrink_uncoded( VipsRegion *from,
VipsRegion *to, const VipsRect *target, VipsRegionShrink method )
{
switch( method ) {
case VIPS_REGION_SHRINK_MEAN:
vips_region_shrink_uncoded_mean( from, to, target );
break;
case VIPS_REGION_SHRINK_MEDIAN:
vips_region_shrink_uncoded_median( from, to, target );
break;
case VIPS_REGION_SHRINK_MODE:
vips_region_shrink_uncoded_mode( from, to, target );
break;
default:
g_assert_not_reached();
}
}
/* No point having an int path, this will always be horribly slow.
*/
#define SHRINK_ALPHA_TYPE( TYPE ) { \
@ -1333,9 +1502,10 @@ vips_region_shrink_alpha( VipsRegion *from,
/**
* vips_region_shrink:
* @from: source region
* @to: (inout): destination region
* @from: source region
* @to: (inout): destination region
* @target: #VipsRect of pixels you need to copy
* @method: #VipsRegionShrink method to use when generating target pixels
*
* Write the pixels @target in @to from the x2 larger area in @from.
* Non-complex uncoded images and LABQ only. Images with alpha (see
@ -1344,7 +1514,8 @@ vips_region_shrink_alpha( VipsRegion *from,
* See also: vips_region_copy().
*/
int
vips_region_shrink( VipsRegion *from, VipsRegion *to, const VipsRect *target )
vips_region_shrink( VipsRegion *from, VipsRegion *to, const VipsRect *target,
VipsRegionShrink method )
{
VipsImage *image = from->im;
@ -1355,10 +1526,10 @@ vips_region_shrink( VipsRegion *from, VipsRegion *to, const VipsRect *target )
if( vips_check_noncomplex( "vips_region_shrink", image ) )
return( -1 );
if( vips_image_hasalpha( image ) )
if( vips_image_hasalpha( image ) )
vips_region_shrink_alpha( from, to, target );
else
vips_region_shrink_uncoded( from, to, target );
vips_region_shrink_uncoded( from, to, target, method );
}
else
vips_region_shrink_labpack( from, to, target );