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im_draw_line() is a wrapper

This commit is contained in:
John Cupitt 2014-02-07 17:42:11 +00:00
parent da6de1f10e
commit 6da3752815
5 changed files with 31 additions and 406 deletions
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23
libvips/deprecated/vips7compat.c
View File

@ -4537,6 +4537,29 @@ im_draw_circle( VipsImage *image,
NULL ) );
}
int
im_draw_line( VipsImage *image, int x1, int y1, int x2, int y2, VipsPel *ink )
{
double *vec;
int n;
if( !(vec = vips__ink_to_vector( "im_draw_line", image, ink, &n )) )
return( -1 );
return( vips_line( image, vec, n, x1, y1, x2, y2, NULL ) );
}
int
im_draw_line_user( VipsImage *image,
int x1, int y1, int x2, int y2,
VipsPlotFn plot, void *a, void *b, void *c )
{
im_error( "im_draw_line_user",
"not supported ... use a VipsLine subclass instead, "
"or vips_line_mask()" );
return( -1 );
}
int
im_draw_mask( VipsImage *image, VipsImage *mask_im, int x, int y, VipsPel *ink )
{

2
libvips/draw/Makefile.am
View File

@ -7,8 +7,8 @@ libdraw_la_SOURCES = \
draw.c \
flood.c \
paintmask.c \
linemask.c \
im_draw_image.c \
im_draw_line.c \
im_draw_point.c \
im_draw_rect.c \
im_draw_smudge.c \

2
libvips/draw/draw.c
View File

@ -131,11 +131,13 @@ vips_draw_operation_init( void )
{
extern GType vips_paintmask_get_type( void );
extern GType vips_line_get_type( void );
extern GType vips_line_mask_get_type( void );
extern GType vips_circle_get_type( void );
extern GType vips_flood_get_type( void );
vips_paintmask_get_type();
vips_line_get_type();
vips_line_mask_get_type();
vips_circle_get_type();
vips_flood_get_type();
}

376
libvips/draw/im_draw_line.c
View File

@ -1,376 +0,0 @@
/* draw straight lines
*
* Copyright: J. Cupitt
* Written: 15/06/1992
* Modified : 22/10/92 - clipping constraints changed
* 22/7/93 JC
* - im_incheck() added
* 16/8/94 JC
* - im_incheck() changed to im_makerw()
* 5/12/06
* - im_invalidate() after paint
* 1/3/10
* - oops, lineset needs to ask for WIO of mask and ink
* 6/3/10
* - don't im_invalidate() after paint, this now needs to be at a higher
* level
* 27/9/10
* - gtk-doc
* - use draw.c base class
* - do pointwise clipping
* - rename as im_draw_line() for consistency
* - cleanups!
*/
/*
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 <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <vips/vips.h>
#include "old_draw.h"
typedef struct _Line {
Draw draw;
int x1, y1;
int x2, y2;
int dx;
int dy;
VipsPlotFn plot;
void *a;
void *b;
void *c;
} Line;
static void
line_free( Line *line )
{
im__draw_free( DRAW( line ) );
im_free( line );
}
static Line *
line_new( VipsImage *im, int x1, int y1, int x2, int y2, VipsPel *ink )
{
Line *line;
if( !(line = IM_NEW( NULL, Line )) )
return( NULL );
if( !im__draw_init( DRAW( line ), im, ink ) ) {
line_free( line );
return( NULL );
}
/* Find offsets.
*/
line->dx = x2 - x1;
line->dy = y2 - y1;
/* Swap endpoints to reduce number of cases.
*/
if( abs( line->dx ) >= abs( line->dy ) && line->dx < 0 ) {
/* Swap to get all x greater or equal cases going to the
* right. Do diagonals here .. just have up and right and down
* and right now.
*/
IM_SWAP( int, x1, x2 );
IM_SWAP( int, y1, y2 );
}
else if( abs( line->dx ) < abs( line->dy ) && line->dy < 0 ) {
/* Swap to get all y greater cases going down the screen.
*/
IM_SWAP( int, x1, x2 );
IM_SWAP( int, y1, y2 );
}
/* Recalculate dx, dy.
*/
line->dx = x2 - x1;
line->dy = y2 - y1;
line->x1 = x1;
line->y1 = y1;
line->x2 = x2;
line->y2 = y2;
line->plot = NULL;
line->a = NULL;
line->b = NULL;
line->c = NULL;
if( x1 < im->Xsize && x1 >= 0 &&
x2 < im->Xsize && x2 >= 0 &&
y1 < im->Ysize && y1 >= 0 &&
y2 < im->Ysize && y2 >= 0 )
DRAW( line )->noclip = TRUE;
return( line );
}
static inline int
line_plot( Line *line, int x, int y )
{
return( line->plot( DRAW( line )->im, x, y,
line->a, line->b, line->c ) );
}
static int
line_draw( Line *line )
{
int x, y, err;
/* Start point and offset.
*/
x = line->x1;
y = line->y1;
/* Special case: zero width and height is single point.
*/
if( line->dx == 0 && line->dy == 0 ) {
if( line_plot( line, x, y ) )
return( -1 );
}
/* Special case vertical and horizontal lines for speed.
*/
else if( line->dx == 0 ) {
/* Vertical line going down.
*/
for( ; y <= line->y2; y++ ) {
if( line_plot( line, x, y ) )
return( -1 );
}
}
else if( line->dy == 0 ) {
/* Horizontal line to the right.
*/
for( ; x <= line->x2; x++ ) {
if( line_plot( line, x, y ) )
return( -1 );
}
}
/* Special case diagonal lines.
*/
else if( abs( line->dy ) == abs( line->dx ) && line->dy > 0 ) {
/* Diagonal line going down and right.
*/
for( ; x <= line->x2; x++, y++ ) {
if( line_plot( line, x, y ) )
return( -1 );
}
}
else if( abs( line->dy ) == abs( line->dx ) && line->dy < 0 ) {
/* Diagonal line going up and right.
*/
for( ; x <= line->x2; x++, y-- ) {
if( line_plot( line, x, y ) )
return( -1 );
}
}
else if( abs( line->dy ) < abs( line->dx ) && line->dy > 0 ) {
/* Between -45 and 0 degrees.
*/
for( err = 0; x <= line->x2; x++ ) {
if( line_plot( line, x, y ) )
return( -1 );
err += line->dy;
if( err >= line->dx ) {
err -= line->dx;
y++;
}
}
}
else if( abs( line->dy ) < abs( line->dx ) && line->dy < 0 ) {
/* Between 0 and 45 degrees.
*/
for( err = 0; x <= line->x2; x++ ) {
if( line_plot( line, x, y ) )
return( -1 );
err -= line->dy;
if( err >= line->dx ) {
err -= line->dx;
y--;
}
}
}
else if( abs( line->dy ) > abs( line->dx ) && line->dx > 0 ) {
/* Between -45 and -90 degrees.
*/
for( err = 0; y <= line->y2; y++ ) {
if( line_plot( line, x, y ) )
return( -1 );
err += line->dx;
if( err >= line->dy ) {
err -= line->dy;
x++;
}
}
}
else if( abs( line->dy ) > abs( line->dx ) && line->dx < 0 ) {
/* Between -90 and -135 degrees.
*/
for( err = 0; y <= line->y2; y++ ) {
if( line_plot( line, x, y ) )
return( -1 );
err -= line->dx;
if( err >= line->dy ) {
err -= line->dy;
x--;
}
}
}
else
g_assert( 0 );
return( 0 );
}
/**
* VipsPlotFn:
* @image: image to draw on
* @x: position to draw at
* @y: position to draw at
* @a: user data
* @b: user data
* @c: user data
*
* A plot function, as used by im_draw_line_user() to draw on an image.
*/
/**
* im_draw_line_user:
* @image: image to draw on
* @x1: start point
* @y1: start point
* @x2: end point
* @y2: end point
* @plot: draw operation
* @a: draw operation parameter
* @b: draw operation parameter
* @c: draw operation parameter
*
* Calls @plot for every point on the line connecting @x1, @y1 and @x2, @y2.
* If you pass im_draw_mask() as the plot operation, you can draw wide lines
* or lines with various brushes.
*
* See also: im_draw_mask(), im_draw_line(), im_draw_circle().
*
* Returns: 0 on success, or -1 on error.
*/
int
im_draw_line_user( VipsImage *image,
int x1, int y1, int x2, int y2,
VipsPlotFn plot, void *a, void *b, void *c )
{
Line *line;
if( im_check_coding_known( "im_draw_line_user", image ) ||
!(line = line_new( image, x1, y1, x2, y2, NULL )) )
return( -1 );
line->plot = plot;
line->a = a;
line->b = b;
line->c = c;
if( line_draw( line ) ) {
line_free( line );
return( -1 );
}
line_free( line );
return( 0 );
}
static int
line_plot_point( VipsImage *im, int x, int y,
void *a, void *b, void *c )
{
Draw *draw = (Draw *) a;
if( draw->noclip )
im__draw_pel( draw, IM_IMAGE_ADDR( draw->im, x, y ) );
else
im__draw_pel_clip( draw, x, y );
return( 0 );
}
/**
* im_draw_line:
* @image: image to draw on
* @x1: start point
* @y1: start point
* @x2: end point
* @y2: end point
* @ink: value to draw
*
* Draws a 1-pixel-wide line on an image.
*
* @ink is an array of bytes
* containing a valid pixel for the image's format.
* It must have at least IM_IMAGE_SIZEOF_PEL( @image ) bytes.
*
* See also: im_draw_circle().
*
* Returns: 0 on success, or -1 on error.
*/
int
im_draw_line( VipsImage *image, int x1, int y1, int x2, int y2, VipsPel *ink )
{
Line *line;
if( im_check_coding_known( "im_draw_line", image ) ||
!(line = line_new( image, x1, y1, x2, y2, ink )) )
return( -1 );
line->plot = line_plot_point;
line->a = line;
if( line_draw( line ) ) {
line_free( line );
return( 0 );
}
line_free( line );
return( 0 );
}

34
libvips/draw/linemask.c
View File

@ -74,41 +74,18 @@ typedef VipsLineClass VipsLineMaskClass;
G_DEFINE_TYPE( VipsLineMask, vips_line_mask, VIPS_TYPE_LINE );
static int
vips_line_mask_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsDraw *draw = VIPS_DRAW( object );
VipsLine *line = (VipsLine *) object;
if( VIPS_OBJECT_CLASS( vips_line_mask_parent_class )->build( object ) )
return( -1 );
if( vips_check_coding_noneorlabq( class->nickname, draw->image ) ||
im_incheck( mask_im ) ||
vips_check_mono( class->nickname, mask_im ) ||
vips_check_uncoded( class->nickname, mask_im ) ||
vips_check_format( class->nickname, mask_im, VIPS_FORMAT_UCHAR ) ||
return( NULL );
return( 0 );
}
static int
vips_line_mask_plot_point( VipsLine *line, int x, int y )
{
VipsDraw *draw = (VipsDraw *) line;
VipsLineMask *line_mask = (VipsLineMask *) line;
if( draw->noclip )
vips__draw_pel( draw, VIPS_IMAGE_ADDR( draw->image, x, y ) );
else
vips__draw_pel_clip( draw, x, y );
return( 0 );
return( vips_paintmask( draw->image,
draw->ink->data, draw->ink->n, line_mask->mask, x, y, NULL ) );
}
static void
vips_line_mask_class_init( VipsLineClass *class )
vips_line_mask_class_init( VipsLineMaskClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
@ -118,7 +95,6 @@ vips_line_mask_class_init( VipsLineClass *class )
vobject_class->nickname = "line_mask";
vobject_class->description = _( "draw a mask along a line" );
vobject_class->build = vips_line_mask_build;
class->plot_point = vips_line_mask_plot_point;
@ -131,7 +107,7 @@ vips_line_mask_class_init( VipsLineClass *class )
}
static void
vips_line_mask_init( VipsLine *line )
vips_line_mask_init( VipsLineMask *line_mask )
{
}