/* Fill a scanline between points x1 and x2 inclusive. x1 < x2.
*/
void
im__draw_scanline( Draw *draw, int y, int x1, int x2 )
{
PEL *mp;
int i;
int len;
g_assert( x1 <= x2 );
if( y < 0 || y >= draw->im->Ysize )
return;
if( x1 < 0 && x2 < 0 )
return;
if( x1 >= draw->im->Xsize && x2 >= draw->im->Xsize )
return;
x1 = IM_CLIP( 0, x1, draw->im->Xsize - 1 );
x2 = IM_CLIP( 0, x2, draw->im->Xsize - 1 );
mp = (PEL *) IM_IMAGE_ADDR( draw->im, x1, y );
len = x2 - x1 + 1;
for( i = 0; i < len; i++ ) {
im__draw_pel( draw, mp );
mp += draw->psize;
}
}
/**
* im_draw_rect:
* @image: image to draw on
* @left: area to paint
* @top: area to paint
* @width: area to paint
* @height: area to paint
* @fill: fill the rect
* @ink: paint with this colour
*
* Paint pixels within @left, @top, @width, @height in @image with @ink. If
* @fill is zero, just paint a 1-pixel-wide outline.
*
* See also: im_draw_circle().
*
* Returns: 0 on success, or -1 on error.
*/
int
im_draw_rect( IMAGE *image,
int left, int top, int width, int height, int fill, VipsPel *ink )
{
Rect im, rect, clipped;
Draw draw;
if( !fill )
return( im_draw_rect( image, left, top, width, 1, 1, ink ) ||
im_draw_rect( image,
left + width - 1, top, 1, height, 1, ink ) ||
im_draw_rect( image,
left, top + height - 1, width, 1, 1, ink ) ||
im_draw_rect( image, left, top, 1, height, 1, ink ) );
int x, y;
VipsPel *to;
VipsPel *q;
/* Find area we plot.
*/
im.left = 0;
im.top = 0;
im.width = image->Xsize;
im.height = image->Ysize;
rect.left = left;
rect.top = top;
rect.width = width;
rect.height = height;
im_rect_intersectrect( &rect, &im, &clipped );
/* Any points left to plot?
*/
if( im_rect_isempty( &clipped ) )
return( 0 );
if( im_check_coding_known( "im_draw_rect", image ) ||
!im__draw_init( &draw, image, ink ) )
return( -1 );
/* We plot the first line pointwise, then memcpy() it for the
* subsequent lines.
*/
to = IM_IMAGE_ADDR( image, clipped.left, clipped.top );
q = to;
for( x = 0; x < clipped.width; x++ ) {
im__draw_pel( &draw, q );
q += draw.psize;
}
q = to + draw.lsize;
for( y = 1; y < clipped.height; y++ ) {
memcpy( q, to, clipped.width * draw.psize );
q += draw.lsize;
}
im__draw_free( &draw );
return( 0 );
}