/* Libart_LGPL - library of basic graphic primitives
 * Copyright (C) 1998 Raph Levien
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <math.h>
#include "art_misc.h"
#include "art_point.h"
#include "art_affine.h"
#include "art_pixbuf.h"
#include "art_rgb_affine.h"
#include "art_rgb_affine.h"
#include "art_rgb_rgba_affine.h"


/* This module handles compositing of affine-transformed generic
   pixbuf images over rgb pixel buffers. */

/* Composite the source image over the destination image, applying the
   affine transform. */

void
art_rgb_pixbuf_affine (art_u8 *dst,
		       int x0, int y0, int x1, int y1, int dst_rowstride,
		       const ArtPixBuf *pixbuf,
		       const double affine[6],
		       ArtFilterLevel level,
		       ArtAlphaGamma *alphagamma)
{
  if (pixbuf->format != ART_PIX_RGB)
    {
      art_warn ("art_rgb_pixbuf_affine: need RGB format image\n");
      return;
    }

  if (pixbuf->bits_per_sample != 8)
    {
      art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
      return;
    }

  if (pixbuf->n_channels != 3 + (pixbuf->has_alpha != 0))
    {
      art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
      return;
    }

  if (pixbuf->has_alpha)
    art_rgb_rgba_affine (dst, x0, y0, x1, y1, dst_rowstride,
			 pixbuf->pixels,
			 pixbuf->width, pixbuf->height, pixbuf->rowstride,
			 affine,
			 level,
			 alphagamma);
  else
    art_rgb_affine (dst, x0, y0, x1, y1, dst_rowstride,
		    pixbuf->pixels,
		    pixbuf->width, pixbuf->height, pixbuf->rowstride,
		    affine,
		    level,
		    alphagamma);
}