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103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <math.h>
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#include "art_misc.h"
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#include "art_point.h"
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#include "art_affine.h"
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#include "art_pixbuf.h"
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#include "art_rgb_affine.h"
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#include "art_rgb_affine.h"
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#include "art_rgb_rgba_affine.h"
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#include "art_rgb_pixbuf_affine.h"
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/* This module handles compositing of affine-transformed generic
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pixbuf images over rgb pixel buffers. */
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/* Composite the source image over the destination image, applying the
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affine transform. */
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/**
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* art_rgb_pixbuf_affine: Affine transform source RGB pixbuf and composite.
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* @dst: Destination image RGB buffer.
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* @x0: Left coordinate of destination rectangle.
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* @y0: Top coordinate of destination rectangle.
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* @x1: Right coordinate of destination rectangle.
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* @y1: Bottom coordinate of destination rectangle.
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* @dst_rowstride: Rowstride of @dst buffer.
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* @pixbuf: source image pixbuf.
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* @affine: Affine transform.
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* @level: Filter level.
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* @alphagamma: #ArtAlphaGamma for gamma-correcting the compositing.
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*
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* Affine transform the source image stored in @src, compositing over
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* the area of destination image @dst specified by the rectangle
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* (@x0, @y0) - (@x1, @y1). As usual in libart, the left and top edges
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* of this rectangle are included, and the right and bottom edges are
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* excluded.
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*
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* The @alphagamma parameter specifies that the alpha compositing be
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* done in a gamma-corrected color space. In the current
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* implementation, it is ignored.
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*
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* The @level parameter specifies the speed/quality tradeoff of the
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* image interpolation. Currently, only ART_FILTER_NEAREST is
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* implemented.
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**/
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void
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art_rgb_pixbuf_affine (art_u8 *dst,
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int x0, int y0, int x1, int y1, int dst_rowstride,
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const ArtPixBuf *pixbuf,
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const double affine[6],
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ArtFilterLevel level,
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ArtAlphaGamma *alphagamma)
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{
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if (pixbuf->format != ART_PIX_RGB)
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{
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art_warn ("art_rgb_pixbuf_affine: need RGB format image\n");
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return;
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}
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if (pixbuf->bits_per_sample != 8)
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{
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art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
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return;
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}
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if (pixbuf->n_channels != 3 + (pixbuf->has_alpha != 0))
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{
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art_warn ("art_rgb_pixbuf_affine: need 8-bit sample data\n");
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return;
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}
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if (pixbuf->has_alpha)
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art_rgb_rgba_affine (dst, x0, y0, x1, y1, dst_rowstride,
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pixbuf->pixels,
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pixbuf->width, pixbuf->height, pixbuf->rowstride,
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affine,
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level,
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alphagamma);
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else
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art_rgb_affine (dst, x0, y0, x1, y1, dst_rowstride,
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pixbuf->pixels,
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pixbuf->width, pixbuf->height, pixbuf->rowstride,
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affine,
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level,
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alphagamma);
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}
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