328 lines
7.2 KiB
C
328 lines
7.2 KiB
C
/* Draw a mask on an image.
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*
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* Copyright: J. Cupitt
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* Written: 15/06/1992
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* 22/7/93 JC
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* - im_incheck() added
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* 16/8/94 JC
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* - im_incheck() changed to im_makerw()
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* 24/10/03 JC
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* - now blends with 0-255 mask
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* 5/12/06
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* - im_invalidate() after paint
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* 6/3/10
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* - don't im_invalidate() after paint, this now needs to be at a higher
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* level
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* 28/9/10
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* - gtk-doc
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* - renamed as im_draw_mask()
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* - use Draw base class
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*/
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include "draw.h"
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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typedef struct _Mask {
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Draw draw;
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/* Parameters.
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*/
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int x;
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int y;
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VipsImage *mask_im;
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/* Derived.
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*/
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Rect image_clip;
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Rect mask_clip;
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} Mask;
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static void
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mask_free( Mask *mask )
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{
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im__draw_free( DRAW( mask ) );
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im_free( mask );
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}
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static Mask *
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mask_new( VipsImage *im, int x, int y, PEL *ink, VipsImage *mask_im )
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{
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Mask *mask;
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Rect area, image;
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if( im_check_coding_noneorlabq( "im_draw_mask", im ) ||
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im_incheck( mask_im ) ||
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im_check_mono( "im_draw_mask", mask_im ) ||
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im_check_uncoded( "im_draw_mask", mask_im ) ||
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im_check_format( "im_draw_mask", mask_im, IM_BANDFMT_UCHAR ) ||
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!(mask = IM_NEW( NULL, Mask )) )
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return( NULL );
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if( !im__draw_init( DRAW( mask ), im, ink ) ) {
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mask_free( mask );
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return( NULL );
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}
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mask->x = x;
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mask->y = y;
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mask->mask_im = mask_im;
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/* Find the area we draw on the image.
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*/
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area.left = x;
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area.top = y;
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area.width = mask_im->Xsize;
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area.height = mask_im->Ysize;
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image.left = 0;
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image.top = 0;
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image.width = im->Xsize;
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image.height = im->Ysize;
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im_rect_intersectrect( &area, &image, &mask->image_clip );
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/* And the area of the mask image we use.
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*/
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mask->mask_clip = mask->image_clip;
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mask->mask_clip.left -= x;
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mask->mask_clip.top -= y;
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return( mask );
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}
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/* Paint ink into an 8 or 16 bit integer image.
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*/
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#define IBLEND( TYPE, TO, INK ) { \
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TYPE *tto = (TYPE *) (TO); \
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TYPE *tink = (TYPE *) (INK); \
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\
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int x, i, j; \
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\
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for( j = 0, x = 0; x < mask->image_clip.width; x++ ) \
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for( i = 0; i < DRAW( mask )->im->Bands; i++, j++ ) \
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tto[j] = (tink[i] * mask_line[x] + \
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tto[j] * (255 - mask_line[x])) / 255; \
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}
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/* Do the blend with doubles.
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*/
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#define DBLEND( TYPE, TO, INK ) { \
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TYPE *tto = (TYPE *) (TO); \
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TYPE *tink = (TYPE *) (INK); \
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\
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int x, i, j; \
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\
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for( j = 0, x = 0; x < mask->image_clip.width; x++ ) \
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for( i = 0; i < DRAW( mask )->im->Bands; i++, j++ ) \
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tto[j] = ((double) tink[i] * mask_line[x] + \
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(double) tto[j] * (255 - mask_line[x])) / 255;\
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}
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/* Blend of complex.
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*/
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#define CBLEND( TYPE, TO, INK ) { \
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TYPE *tto = (TYPE *) (TO); \
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TYPE *tink = (TYPE *) (INK); \
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\
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int x, i, j; \
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\
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for( j = 0, x = 0; x < mask->image_clip.width; x++ ) \
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for( i = 0; i < DRAW( mask )->im->Bands * 2; i += 2, j += 2 ) { \
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tto[j] = ((double) tink[i] * mask_line[x] + \
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(double) tto[j] * (255 - mask_line[x])) / 255;\
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tto[j + 1] = ((double) tink[i + 1] * mask_line[x] + \
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(double) tto[j + 1] * (255 - mask_line[x])) / \
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255;\
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} \
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}
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static int
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mask_draw_labq( Mask *mask )
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{
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float *lab_buffer;
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float ink_buffer[3];
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int y;
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if( !(lab_buffer = IM_ARRAY( NULL,
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mask->image_clip.width * 3, float )) )
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return( -1 );
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imb_LabQ2Lab( DRAW( mask )->ink, ink_buffer, 1 );
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for( y = 0; y < mask->image_clip.height; y++ ) {
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PEL *to = (PEL *) IM_IMAGE_ADDR( DRAW( mask )->im,
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mask->image_clip.left, y + mask->image_clip.top );
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PEL *mask_line = (PEL *) IM_IMAGE_ADDR( mask->mask_im,
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mask->mask_clip.left, y + mask->mask_clip.top );
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imb_LabQ2Lab( to, lab_buffer, mask->image_clip.width );
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DBLEND( float, lab_buffer, ink_buffer );
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imb_Lab2LabQ( lab_buffer, to, mask->image_clip.width );
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}
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im_free( lab_buffer );
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return( 0 );
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}
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static int
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mask_draw( Mask *mask )
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{
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int y;
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for( y = 0; y < mask->image_clip.height; y++ ) {
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PEL *to = (PEL *) IM_IMAGE_ADDR( DRAW( mask )->im,
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mask->image_clip.left,
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y + mask->image_clip.top );
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PEL *mask_line = (PEL *) IM_IMAGE_ADDR( mask->mask_im,
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mask->mask_clip.left,
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y + mask->mask_clip.top );
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switch( DRAW( mask )->im->BandFmt ) {
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case IM_BANDFMT_UCHAR:
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IBLEND( unsigned char, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_CHAR:
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IBLEND( signed char, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_USHORT:
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IBLEND( unsigned short, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_SHORT:
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IBLEND( signed short, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_UINT:
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DBLEND( unsigned int, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_INT:
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DBLEND( signed int, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_FLOAT:
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DBLEND( float, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_DOUBLE:
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DBLEND( double, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_COMPLEX:
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CBLEND( float, to, DRAW( mask )->ink );
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break;
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case IM_BANDFMT_DPCOMPLEX:
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CBLEND( double, to, DRAW( mask )->ink );
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break;
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default:
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g_assert( 0 );
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}
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}
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return( 0 );
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}
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/**
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* im_draw_mask:
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* @image: image to draw on
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* @x: draw mask here
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* @y: draw mask here
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* @ink: value to draw
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* @mask_im: mask of 0/255 values showing where to plot
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*
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* Draw a mask on the image. @mask_im is a monochrome 8-bit image with 0/255
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* for transparent or @ink coloured points. Intermediate values blend the ink
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* with the pixel. Use with im_text() to draw text on an image.
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*
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* @ink is an array of bytes
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* containing a valid pixel for the image's format.
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* It must have at least IM_IMAGE_SIZEOF_PEL( @image ) bytes.
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*
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* See also: im_draw_circle(), im_text(), im_draw_line_user().
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*
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* Returns: 0 on success, or -1 on error.
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*/
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int
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im_draw_mask( VipsImage *image, VipsImage *mask_im, int x, int y, PEL *ink )
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{
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Mask *mask;
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if( !(mask = mask_new( image, x, y, ink, mask_im )) )
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return( -1 );
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/* Any points to plot?
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*/
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if( im_rect_isempty( &mask->image_clip ) ) {
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mask_free( mask );
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return( 0 );
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}
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/* Loop through image plotting where required.
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*/
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switch( image->Coding ) {
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case IM_CODING_LABQ:
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if( mask_draw_labq( mask ) ) {
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mask_free( mask );
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return( 0 );
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}
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break;
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case IM_CODING_NONE:
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if( mask_draw( mask ) ) {
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mask_free( mask );
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return( 0 );
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}
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break;
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default:
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g_assert( 0 );
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}
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mask_free( mask );
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return( 0 );
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}
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