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better mask painting in im_render()

This commit is contained in:
John Cupitt 2010-03-15 16:00:28 +00:00
parent 7c1d0a7bfb
commit f6373987e1
1 changed files with 4 additions and 26 deletions
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30
libvips/iofuncs/im_render.c
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@ -1032,30 +1032,6 @@ region_fill( REGION *out, void *seq, void *a, void *b )
return( 0 );
}
/* Paint the state of the 'painted' flag for a tile.
*/
static void
tile_paint_mask( Tile *tile, REGION *to )
{
int mask = tile->state == TILE_PAINTED ? 255 : 0;
Rect ovlap;
int y;
int len;
/* Find common pixels.
*/
im_rect_intersectrect( &tile->area, &to->valid, &ovlap );
g_assert( !im_rect_isempty( &ovlap ) );
len = IM_IMAGE_SIZEOF_PEL( to->im ) * ovlap.width;
for( y = ovlap.top; y < IM_RECT_BOTTOM( &ovlap ); y++ ) {
PEL *q = (PEL *) IM_REGION_ADDR( to, ovlap.left, y );
memset( q, mask, len );
}
}
/* The mask image is 255 / 0 for the state of painted for each tile.
*/
static int
@ -1081,14 +1057,16 @@ mask_fill( REGION *out, void *seq, void *a, void *b )
for( x = xs; x < IM_RECT_RIGHT( r ); x += render->width ) {
Rect area;
Tile *tile;
int value;
area.left = x;
area.top = y;
area.width = render->width;
area.height = render->height;
if( (tile = render_tile_lookup( render, &area )) )
tile_paint_mask( tile, out );
tile = render_tile_lookup( render, &area );
value = (tile && tile->state == TILE_PAINTED) ? 255 : 0;
im_region_paint( out, &area, value );
}
g_mutex_unlock( render->read_lock );