92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/* base class for drawing operations
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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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/* Our state.
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*/
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typedef struct _Draw {
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/* Parameters.
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*/
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IMAGE *im; /* Draw here */
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PEL *ink; /* Copy of ink param */
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/* Derived stuff.
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*/
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size_t lsize;
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size_t psize;
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/* If the object to draw is entirely within the image, we have a
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* faster noclip path.
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*/
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gboolean noclip;
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} Draw;
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#define DRAW(X) ((Draw *)(X))
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static inline void
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im__draw_pel( Draw *draw, PEL *q )
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{
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int j;
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/* Faster than memcopy() for n < about 20.
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*/
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for( j = 0; j < draw->psize; j++ )
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q[j] = draw->ink[j];
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}
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/* Paint, with clip.
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*/
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static inline void
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im__draw_pel_clip( Draw *draw, int x, int y )
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{
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if( x < 0 || x >= draw->im->Xsize )
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return;
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if( y < 0 || y >= draw->im->Ysize )
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return;
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im__draw_pel( draw, (PEL *) IM_IMAGE_ADDR( draw->im, x, y ) );
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}
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/* Is p painted?
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*/
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static inline gboolean
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im__draw_painted( Draw *draw, PEL *p )
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{
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int j;
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for( j = 0; j < draw->psize; j++ )
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if( p[j] != draw->ink[j] )
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break;
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return( j == draw->psize );
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}
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void im__draw_scanline( Draw *draw, int y, int x1, int x2 );
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void im__draw_free( Draw *draw );
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Draw *im__draw_init( Draw *draw, IMAGE *im, PEL *ink );
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