/***********************************************************************
* clip_visrect
*
* Clip a rectangle to the DC visible rect.
*/
BOOL clip_visrect( DC *dc, RECT *dst, const RECT *src )
{
RECT clip;
if (!clip_device_rect( dc, dst, src )) return FALSE;
if (GetRgnBox( get_dc_region(dc), &clip )) return intersect_rect( dst, dst, &clip );
return TRUE;
}
static BOOL get_vis_rectangles( DC *dc_dst, struct bitblt_coords *dst,
DC *dc_src, struct bitblt_coords *src )
{
RECT rect;
/* get the destination visible rectangle */
rect.left = dst->log_x;
rect.top = dst->log_y;
rect.right = dst->log_x + dst->log_width;
rect.bottom = dst->log_y + dst->log_height;
LPtoDP( dc_dst->hSelf, (POINT *)&rect, 2 );
dst->x = rect.left;
dst->y = rect.top;
dst->width = rect.right - rect.left;
dst->height = rect.bottom - rect.top;
if (dst->layout & LAYOUT_RTL && dst->layout & LAYOUT_BITMAPORIENTATIONPRESERVED)
{
dst->x += dst->width;
dst->width = -dst->width;
}
get_bounding_rect( &rect, dst->x, dst->y, dst->width, dst->height );
clip_visrect( dc_dst, &dst->visrect, &rect );
/* get the source visible rectangle */
if (!src) return !is_rect_empty( &dst->visrect );
rect.left = src->log_x;
rect.top = src->log_y;
rect.right = src->log_x + src->log_width;
rect.bottom = src->log_y + src->log_height;
LPtoDP( dc_src->hSelf, (POINT *)&rect, 2 );
src->x = rect.left;
src->y = rect.top;
src->width = rect.right - rect.left;
src->height = rect.bottom - rect.top;
if (src->layout & LAYOUT_RTL && src->layout & LAYOUT_BITMAPORIENTATIONPRESERVED)
{
src->x += src->width;
src->width = -src->width;
}
get_bounding_rect( &rect, src->x, src->y, src->width, src->height );
if (!clip_device_rect( dc_src, &src->visrect, &rect )) return FALSE;
if (is_rect_empty( &dst->visrect )) return FALSE;
return intersect_vis_rectangles( dst, src );
}
