155 lines
2.9 KiB
C++
155 lines
2.9 KiB
C++
// VIPS region wrapper
|
|
|
|
/*
|
|
|
|
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_VREGION_H
|
|
#define VIPS_VREGION_H
|
|
|
|
#include <vips/vips.h>
|
|
|
|
VIPS_NAMESPACE_START
|
|
|
|
/**
|
|
* A region of an image. Can be used to access raw pixel data.
|
|
* */
|
|
class VRegion : public VObject {
|
|
public:
|
|
/**
|
|
* Create a VRegion that wraps a VipsRegion object. If steal
|
|
* is STEAL, then this VRegion takes over ownership of the libvips
|
|
* object and will automatically unref it.
|
|
*/
|
|
explicit VRegion(VipsRegion *region, VSteal steal = STEAL)
|
|
: VObject((VipsObject *) region, steal)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Create a VRegion from an image.
|
|
*/
|
|
static VRegion
|
|
new_from_image(VImage image);
|
|
|
|
/**
|
|
* Get a pointer to the underlying VipsRegion object.
|
|
*/
|
|
VipsRegion *
|
|
get_region() const
|
|
{
|
|
return (VipsRegion *) VObject::get_object();
|
|
}
|
|
|
|
/**
|
|
* Prepare the region from VipsRect.
|
|
*/
|
|
void
|
|
prepare(const VipsRect *rect) const
|
|
{
|
|
if (vips_region_prepare(get_region(), rect))
|
|
throw VError();
|
|
}
|
|
|
|
/**
|
|
* Prepare the region from rectangle coordinates.
|
|
*/
|
|
void
|
|
prepare(int left, int top, int width, int height) const
|
|
{
|
|
VipsRect rect = { left, top, width, height };
|
|
|
|
prepare(&rect);
|
|
}
|
|
|
|
/**
|
|
* Get valid bounds of the region.
|
|
*/
|
|
VipsRect
|
|
valid() const
|
|
{
|
|
return get_region()->valid;
|
|
}
|
|
|
|
/**
|
|
* Get pointer to the start of the region.
|
|
*/
|
|
VipsPel *
|
|
addr() const
|
|
{
|
|
return addr(0);
|
|
}
|
|
|
|
/**
|
|
* Get pointer at the given index of the region.
|
|
*/
|
|
VipsPel *
|
|
addr(size_t i) const
|
|
{
|
|
return &VIPS_REGION_ADDR_TOPLEFT(get_region())[i];
|
|
}
|
|
|
|
/**
|
|
* Get pointer at the given coordinates of the region.
|
|
*/
|
|
VipsPel *
|
|
addr(int x, int y) const
|
|
{
|
|
return VIPS_REGION_ADDR(get_region(), x, y);
|
|
}
|
|
|
|
/**
|
|
* Get the stride (bytes per row, including padding) of the region.
|
|
*/
|
|
size_t
|
|
stride() const
|
|
{
|
|
return VIPS_REGION_LSKIP(get_region());
|
|
}
|
|
|
|
/**
|
|
* Get VipsPel at the given index of the region.
|
|
*/
|
|
VipsPel
|
|
operator[](size_t i) const
|
|
{
|
|
return *addr(i);
|
|
}
|
|
|
|
/**
|
|
* Get VipsPel at the given coordinates of the region.
|
|
*/
|
|
VipsPel
|
|
operator()(int x, int y) const
|
|
{
|
|
return *addr(x, y);
|
|
}
|
|
};
|
|
|
|
VIPS_NAMESPACE_END
|
|
|
|
#endif /*VIPS_VREGION_H*/
|