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/* base class for drawing operations
*
* 27/9/10
* - from im_draw_circle()
* 17/11/10
* - oops, scanline clipping was off by 1
*/
/*
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <string.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pdraw.h"
/**
* SECTION: draw
* @short_description: drawing operations: flood, paste, line, circle
* @stability: Stable
* @include: vips/vips.h
*
* These operations directly modify the image. They do not thread, on 32-bit
* machines they will be limited to 2GB images, and a little care needs to be
* taken if you use them as part of an image pipeline.
* They are mostly supposed to be useful for paintbox-style programs.
*
* libvips operations are all functional: they take zero or more existing input
* images and generate zero or more new output images. Images are
* never altered, you always create new images. This means libvips can cache
* and thread very aggressively.
*
* The downside is that creating entirely fresh images each time can be very
* slow. libvips has a range of tricks to avoid these problems, but there are
* still times when you really have to be able to modify an image. An example
* might be drawing a curved line from a set of straight line segments: if you
* need to draw 1,000 straight lines, a 1,000 operation-deep pipeline is going
* to be a slow way to do it. This is where the draw operations come in.
*
* To use these operations, use vips_image_copy_memory() to make a private
* memory copy of the image you want to modify, then call a
* series of draw operations.
*
* Once you are done drawing, return to normal use of vips operations. Any time
* you want to start drawing again, you'll need to copy again.
*/
/**
* VipsCombineMode:
* @VIPS_COMBINE_MODE_SET: set pixels to the new value
* @VIPS_COMBINE_MODE_ADD: add pixels
*
* See vips_draw_image() and so on.
*
* Operations like vips_draw_image() need to be told how to combine images
* from two sources.
*
* See also: vips_join().
*/
G_DEFINE_ABSTRACT_TYPE( VipsDraw, vips_draw, VIPS_TYPE_OPERATION );
static int
vips_draw_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsDraw *draw = VIPS_DRAW( object );
#ifdef DEBUG
printf( "vips_draw_build: " );
vips_object_print_name( object );
printf( "\n" );
#endif /*DEBUG*/
if( VIPS_OBJECT_CLASS( vips_draw_parent_class )->build( object ) )
return( -1 );
if( vips_check_coding_known( class->nickname, draw->image ) ||
vips_image_inplace( draw->image ) )
return( -1 );
draw->lsize = VIPS_IMAGE_SIZEOF_LINE( draw->image );
draw->psize = VIPS_IMAGE_SIZEOF_PEL( draw->image );
draw->noclip = FALSE;
return( 0 );
}
static void
vips_draw_class_init( VipsDrawClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "draw";
vobject_class->description = _( "draw operations" );
vobject_class->build = vips_draw_build;
VIPS_ARG_IMAGE( class, "image", 1,
_( "Image" ),
_( "Image to draw on" ),
VIPS_ARGUMENT_REQUIRED_INPUT | VIPS_ARGUMENT_MODIFY,
G_STRUCT_OFFSET( VipsDraw, image ) );
}
static void
vips_draw_init( VipsDraw *draw )
{
}
void
vips_draw_operation_init( void )
{
extern GType vips_draw_rect_get_type( void );
extern GType vips_draw_image_get_type( void );
extern GType vips_draw_mask_get_type( void );
extern GType vips_draw_line_get_type( void );
extern GType vips_draw_circle_get_type( void );
extern GType vips_draw_flood_get_type( void );
extern GType vips_draw_smudge_get_type( void );
vips_draw_rect_get_type();
vips_draw_image_get_type();
vips_draw_mask_get_type();
vips_draw_line_get_type();
vips_draw_circle_get_type();
vips_draw_flood_get_type();
vips_draw_smudge_get_type();
}
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