libart 2.3.16

[swftools.git] / lib / art / art_rgb_pixbuf_affine.c

diff --git a/lib/art/art_rgb_pixbuf_affine.c b/lib/art/art_rgb_pixbuf_affine.c
new file mode 100644 (file)
index 0000000..0a25b57
--- /dev/null
+++ b/lib/art/art_rgb_pixbuf_affine.c
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+/* 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 <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. */
+/**
+ * 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);
+}