X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Fart%2Fart_rgb_pixbuf_affine.c;fp=lib%2Fart%2Fart_rgb_pixbuf_affine.c;h=0a25b575db0556e31e8bf450aad4b5a2a54759ca;hb=418ef05b5d0b74e6f19200ffa40bcc3afccb5029;hp=0000000000000000000000000000000000000000;hpb=c1f4a906117e98e2f4ba59abc1ce153e8129bc19;p=swftools.git diff --git a/lib/art/art_rgb_pixbuf_affine.c b/lib/art/art_rgb_pixbuf_affine.c new file mode 100644 index 0000000..0a25b57 --- /dev/null +++ b/lib/art/art_rgb_pixbuf_affine.c @@ -0,0 +1,104 @@ +/* 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 "config.h" +#include "art_rgb_pixbuf_affine.h" + +#include +#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. */ +/** + * art_rgb_pixbuf_affine: Affine transform source RGB pixbuf and composite. + * @dst: Destination image RGB buffer. + * @x0: Left coordinate of destination rectangle. + * @y0: Top coordinate of destination rectangle. + * @x1: Right coordinate of destination rectangle. + * @y1: Bottom coordinate of destination rectangle. + * @dst_rowstride: Rowstride of @dst buffer. + * @pixbuf: source image pixbuf. + * @affine: Affine transform. + * @level: Filter level. + * @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing. + * + * Affine transform the source image stored in @src, compositing over + * the area of destination image @dst specified by the rectangle + * (@x0, @y0) - (@x1, @y1). As usual in libart, the left and top edges + * of this rectangle are included, and the right and bottom edges are + * excluded. + * + * The @alphagamma parameter specifies that the alpha compositing be + * done in a gamma-corrected color space. In the current + * implementation, it is ignored. + * + * The @level parameter specifies the speed/quality tradeoff of the + * image interpolation. Currently, only ART_FILTER_NEAREST is + * implemented. + **/ +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); +}