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/* Definitions for partial image regions.
*
* J.Cupitt, 8/4/93
*
* 2/3/11
* - move to GObject
*/
/*
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
*/
#ifndef VIPS_REGION_H
#define VIPS_REGION_H
#include <glib.h>
#include <glib-object.h>
#include <vips/object.h>
#include <vips/image.h>
#include <vips/rect.h>
#include <vips/private.h>
#ifdef __cplusplus
extern "C" {
#endif /*__cplusplus*/
#define VIPS_TYPE_REGION (vips_region_get_type())
#define VIPS_REGION(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), \
VIPS_TYPE_REGION, VipsRegion))
#define VIPS_REGION_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass), \
VIPS_TYPE_REGION, VipsRegionClass))
#define VIPS_IS_REGION(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), VIPS_TYPE_REGION))
#define VIPS_IS_REGION_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass), VIPS_TYPE_REGION))
#define VIPS_REGION_GET_CLASS(obj) \
(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
* @VIPS_REGION_SHRINK_MAX: use the maximum
* @VIPS_REGION_SHRINK_MIN: use the minimum
* @VIPS_REGION_SHRINK_NEAREST: use the top-left pixel
*
* 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_MAX,
VIPS_REGION_SHRINK_MIN,
VIPS_REGION_SHRINK_NEAREST,
VIPS_REGION_SHRINK_LAST
} VipsRegionShrink;
/* Sub-area of image.
*
* Matching typedef in basic.h.
*/
struct _VipsRegion {
VipsObject parent_object;
/*< public >*/
/* Users may read these two fields.
*/
VipsImage *im; /* Link back to parent image */
VipsRect valid; /* Area of parent we can see */
/* The rest of VipsRegion is private.
*/
/*< private >*/
RegionType type; /* What kind of attachment */
VipsPel *data; /* Off here to get data */
int bpl; /* Bytes-per-line for data */
void *seq; /* Sequence we are using to fill region */
/* The thread that made this region. Used to assert() test that
* regions are not being shared between threads.
*/
GThread *thread;
/* Ref to the window we use for this region, if any.
*/
VipsWindow *window;
/* Ref to the buffer we use for this region, if any.
*/
VipsBuffer *buffer;
/* The image this region is on has changed and caches need to be
* dropped.
*/
gboolean invalid;
};
typedef struct _VipsRegionClass {
VipsObjectClass parent_class;
} VipsRegionClass;
/* Don't put spaces around void here, it breaks gtk-doc.
*/
VIPS_API
GType vips_region_get_type(void);
VIPS_API
VipsRegion *vips_region_new(VipsImage *image);
VIPS_API
int vips_region_buffer(VipsRegion *reg, const VipsRect *r);
VIPS_API
int vips_region_image(VipsRegion *reg, const VipsRect *r);
VIPS_API
int vips_region_region(VipsRegion *reg, VipsRegion *dest,
const VipsRect *r, int x, int y);
VIPS_API
int vips_region_equalsregion(VipsRegion *reg1, VipsRegion *reg2);
VIPS_API
int vips_region_position(VipsRegion *reg, int x, int y);
VIPS_API
void vips_region_paint(VipsRegion *reg, const VipsRect *r, int value);
VIPS_API
void vips_region_paint_pel(VipsRegion *reg,
const VipsRect *r, const VipsPel *ink);
VIPS_API
void vips_region_black(VipsRegion *reg);
VIPS_API
void vips_region_copy(VipsRegion *reg, VipsRegion *dest,
const VipsRect *r, int x, int y);
VIPS_API
int vips_region_shrink_method(VipsRegion *from, VipsRegion *to,
const VipsRect *target, VipsRegionShrink method);
VIPS_API
int vips_region_shrink(VipsRegion *from, VipsRegion *to,
const VipsRect *target);
VIPS_API
int vips_region_prepare(VipsRegion *reg, const VipsRect *r);
VIPS_API
int vips_region_prepare_to(VipsRegion *reg,
VipsRegion *dest, const VipsRect *r, int x, int y);
VIPS_API
VipsPel *vips_region_fetch(VipsRegion *region,
int left, int top, int width, int height, size_t *len);
VIPS_API
int vips_region_width(VipsRegion *region);
VIPS_API
int vips_region_height(VipsRegion *region);
VIPS_API
void vips_region_invalidate(VipsRegion *reg);
/* Use this to count pixels passing through key points. Handy for spotting bad
* overcomputation.
*/
#ifdef DEBUG_LEAK
#define VIPS_COUNT_PIXELS(R, N) vips__region_count_pixels(R, N)
#else /*!DEBUG_LEAK*/
#define VIPS_COUNT_PIXELS(R, N)
#endif /*DEBUG_LEAK*/
#define VIPS_REGION_LSKIP(R) \
((size_t) ((R)->bpl))
#define VIPS_REGION_N_ELEMENTS(R) \
((size_t) ((R)->valid.width * (R)->im->Bands))
#define VIPS_REGION_SIZEOF_ELEMENT(R) \
(VIPS_IMAGE_SIZEOF_ELEMENT((R)->im))
#define VIPS_REGION_SIZEOF_PEL(R) \
(VIPS_IMAGE_SIZEOF_PEL((R)->im))
#define VIPS_REGION_SIZEOF_LINE(R) \
((size_t) ((R)->valid.width * VIPS_REGION_SIZEOF_PEL(R)))
/* If DEBUG is defined, add bounds checking.
*/
#ifdef DEBUG
#define VIPS_REGION_ADDR(R, X, Y) \
((vips_rect_includespoint(&(R)->valid, (X), (Y))) \
? ((R)->data + ((Y) - (R)->valid.top) * VIPS_REGION_LSKIP(R) + \
((X) - (R)->valid.left) * VIPS_REGION_SIZEOF_PEL(R)) \
: (fprintf(stderr, \
"VIPS_REGION_ADDR: point out of bounds, " \
"file \"%s\", line %d\n" \
"(point x=%d, y=%d\n" \
" should have been within VipsRect left=%d, top=%d, " \
"width=%d, height=%d)\n", \
__FILE__, __LINE__, \
(X), (Y), \
(R)->valid.left, \
(R)->valid.top, \
(R)->valid.width, \
(R)->valid.height), \
abort(), (VipsPel *) NULL))
#else /*DEBUG*/
#define VIPS_REGION_ADDR(R, X, Y) \
((R)->data + \
((Y) - (R)->valid.top) * VIPS_REGION_LSKIP(R) + \
((X) - (R)->valid.left) * VIPS_REGION_SIZEOF_PEL(R))
#endif /*DEBUG*/
#define VIPS_REGION_ADDR_TOPLEFT(R) ((R)->data)
#ifdef __cplusplus
}
#endif /*__cplusplus*/
#endif /*VIPS_REGION_H*/