Initial import of libart 2.3.21

1 files changed, 198 insertions, 0 deletions

diff --git a/art_rgb_bitmap_affine.c b/art_rgb_bitmap_affine.c
new file mode 100644
index 0000000..825f8b5
--- /dev/null
+++ b/art_rgb_bitmap_affine.c
@@ -0,0 +1,198 @@
+/* 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_bitmap_affine.h"
+
+#include <math.h>
+#include "art_misc.h"
+#include "art_point.h"
+#include "art_affine.h"
+#include "art_rgb_affine_private.h"
+
+/* This module handles compositing of affine-transformed bitmap images
+   over rgb pixel buffers. */
+
+/* Composite the source image over the destination image, applying the
+   affine transform. Foreground color is given and assumed to be
+   opaque, background color is assumed to be fully transparent. */
+
+static void
+art_rgb_bitmap_affine_opaque (art_u8 *dst,
+			      int x0, int y0, int x1, int y1,
+			      int dst_rowstride,
+			      const art_u8 *src,
+			      int src_width, int src_height, int src_rowstride,
+			      art_u32 rgb,
+			      const double affine[6],
+			      ArtFilterLevel level,
+			      ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  art_u8 r, g, b;
+  int run_x0, run_x1;
+
+  r = rgb >> 16;
+  g = (rgb >> 8) & 0xff;
+  b = rgb & 0xff;
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + (src_x >> 3);
+	  if (*src_p & (128 >> (src_x & 7)))
+	    {
+	      dst_p[0] = r;
+	      dst_p[1] = g;
+	      dst_p[2] = b;
+	    }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}
+/* Composite the source image over the destination image, applying the
+   affine transform. Foreground color is given, background color is
+   assumed to be fully transparent. */
+
+/**
+ * art_rgb_bitmap_affine: Affine transform source bitmap image 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.
+ * @src: Source image bitmap buffer.
+ * @src_width: Width of source image.
+ * @src_height: Height of source image.
+ * @src_rowstride: Rowstride of @src buffer.
+ * @rgba: RGBA foreground color, in 0xRRGGBBAA.
+ * @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).
+ *
+ * The source bitmap stored with MSB as the leftmost pixel. Source 1
+ * bits correspond to the semitransparent color @rgba, while source 0
+ * bits are transparent.
+ *
+ * See art_rgb_affine() for a description of additional parameters.
+ **/
+void
+art_rgb_bitmap_affine (art_u8 *dst,
+		       int x0, int y0, int x1, int y1, int dst_rowstride,
+		       const art_u8 *src,
+		       int src_width, int src_height, int src_rowstride,
+		       art_u32 rgba,
+		       const double affine[6],
+		       ArtFilterLevel level,
+		       ArtAlphaGamma *alphagamma)
+{
+  /* Note: this is a slow implementation, and is missing all filter
+     levels other than NEAREST. It is here for clarity of presentation
+     and to establish the interface. */
+  int x, y;
+  double inv[6];
+  art_u8 *dst_p, *dst_linestart;
+  const art_u8 *src_p;
+  ArtPoint pt, src_pt;
+  int src_x, src_y;
+  int alpha;
+  art_u8 bg_r, bg_g, bg_b;
+  art_u8 fg_r, fg_g, fg_b;
+  art_u8 r, g, b;
+  int run_x0, run_x1;
+
+  alpha = rgba & 0xff;
+  if (alpha == 0xff)
+    {
+      art_rgb_bitmap_affine_opaque (dst, x0, y0, x1, y1, dst_rowstride,
+				    src,
+				    src_width, src_height, src_rowstride,
+				    rgba >> 8,
+				    affine,
+				    level,
+				    alphagamma);
+      return;
+    }
+  /* alpha = (65536 * alpha) / 255; */
+  alpha = (alpha << 8) + alpha + (alpha >> 7);
+  r = rgba >> 24;
+  g = (rgba >> 16) & 0xff;
+  b = (rgba >> 8) & 0xff;
+  dst_linestart = dst;
+  art_affine_invert (inv, affine);
+  for (y = y0; y < y1; y++)
+    {
+      pt.y = y + 0.5;
+      run_x0 = x0;
+      run_x1 = x1;
+      art_rgb_affine_run (&run_x0, &run_x1, y, src_width, src_height,
+			  inv);
+      dst_p = dst_linestart + (run_x0 - x0) * 3;
+      for (x = run_x0; x < run_x1; x++)
+	{
+	  pt.x = x + 0.5;
+	  art_affine_point (&src_pt, &pt, inv);
+	  src_x = floor (src_pt.x);
+	  src_y = floor (src_pt.y);
+	  src_p = src + (src_y * src_rowstride) + (src_x >> 3);
+	  if (*src_p & (128 >> (src_x & 7)))
+	    {
+	      bg_r = dst_p[0];
+	      bg_g = dst_p[1];
+	      bg_b = dst_p[2];
+
+	      fg_r = bg_r + (((r - bg_r) * alpha + 0x8000) >> 16);
+	      fg_g = bg_g + (((g - bg_g) * alpha + 0x8000) >> 16);
+	      fg_b = bg_b + (((b - bg_b) * alpha + 0x8000) >> 16);
+
+	      dst_p[0] = fg_r;
+	      dst_p[1] = fg_g;
+	      dst_p[2] = fg_b;
+	    }
+	  dst_p += 3;
+	}
+      dst_linestart += dst_rowstride;
+    }
+}