156 lines
2.9 KiB
C++
156 lines
2.9 KiB
C++
// VIPS region wrapper
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifndef VIPS_VREGION_H
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#define VIPS_VREGION_H
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#include <vips/vips.h>
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VIPS_NAMESPACE_START
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/**
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* A region of an image. Can be used to access raw pixel data.
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* */
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class VRegion : public VObject
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{
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public:
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/**
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* Create a VRegion that wraps a VipsRegion object. If steal
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* is STEAL, then this VRegion takes over ownership of the libvips
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* object and will automatically unref it.
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*/
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VRegion( VipsRegion *region, VSteal steal = STEAL ) :
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VObject( (VipsObject *) region, steal )
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{
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}
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/**
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* Create a VRegion from an image.
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*/
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static VRegion
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new_from_image( VImage image );
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/**
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* Get a pointer to the underlying VipsRegion object.
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*/
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VipsRegion *
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get_region() const
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{
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return (VipsRegion *) VObject::get_object();
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}
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/**
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* Prepare the region from VipsRect.
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*/
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void
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prepare( const VipsRect *rect ) const
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{
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if ( vips_region_prepare( get_region(), rect ) )
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throw VError();
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}
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/**
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* Prepare the region from rectangle coordinates.
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*/
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void
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prepare( int left, int top, int width, int height ) const
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{
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VipsRect rect = { left, top, width, height };
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prepare( &rect );
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}
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/**
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* Get valid bounds of the region.
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*/
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VipsRect
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valid() const
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{
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return get_region()->valid;
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}
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/**
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* Get pointer to the start of the region.
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*/
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VipsPel *
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addr() const
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{
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return addr( 0 );
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}
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/**
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* Get pointer at the given index of the region.
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*/
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VipsPel *
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addr( size_t i ) const
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{
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return &VIPS_REGION_ADDR_TOPLEFT( get_region() )[i];
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}
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/**
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* Get pointer at the given coordinates of the region.
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*/
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VipsPel *
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addr( int x, int y ) const
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{
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return VIPS_REGION_ADDR( get_region(), x, y );
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}
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/**
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* Get the stride (bytes per row, including padding) of the region.
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*/
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size_t
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stride() const
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{
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return VIPS_REGION_LSKIP( get_region() );
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}
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/**
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* Get VipsPel at the given index of the region.
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*/
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VipsPel
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operator[]( size_t i ) const
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{
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return *addr( i );
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}
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/**
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* Get VipsPel at the given coordinates of the region.
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*/
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VipsPel
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operator()( int x, int y ) const
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{
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return *addr( x, y );
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}
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};
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VIPS_NAMESPACE_END
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#endif /*VIPS_VREGION_H*/
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