killem

[rrdtool.git] / libraries / libart_lgpl-2.3.7 / art_rgb_affine_private.c

diff --git a/libraries/libart_lgpl-2.3.7/art_rgb_affine_private.c b/libraries/libart_lgpl-2.3.7/art_rgb_affine_private.c
deleted file mode 100644 (file)
index 949a89a..0000000
--- a/libraries/libart_lgpl-2.3.7/art_rgb_affine_private.c
+++ /dev/null
@@ -1,125 +0,0 @@
-/* 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_rgb_affine_private.h"
-
-/* Private functions for the rgb affine image compositors - primarily,
-   the determination of runs, eliminating the need for source image
-   bbox calculation in the inner loop. */
-
-/* Determine a "run", such that the inverse affine of all pixels from
-   (x0, y) inclusive to (x1, y) exclusive fit within the bounds
-   of the source image.
-
-   Initial values of x0, x1, and result values stored in first two
-   pointer arguments.
-*/
-
-#define EPSILON 1e-6
-
-void
-art_rgb_affine_run (int *p_x0, int *p_x1, int y,
-                   int src_width, int src_height,
-                   const double affine[6])
-{
-  int x0, x1;
-  double z;
-  double x_intercept;
-  int xi;
-
-  x0 = *p_x0;
-  x1 = *p_x1;
-
-  /* do left and right edges */
-  if (affine[0] > EPSILON)
-    {
-      z = affine[2] * (y + 0.5) + affine[4];
-      x_intercept = -z / affine[0];
-      xi = ceil (x_intercept + EPSILON - 0.5);
-      if (xi > x0)
-       x0 = xi;
-      x_intercept = (-z + src_width) / affine[0];
-      xi = ceil (x_intercept - EPSILON - 0.5);
-      if (xi < x1)
-       x1 = xi;
-    }
-  else if (affine[0] < -EPSILON)
-    {
-      z = affine[2] * (y + 0.5) + affine[4];
-      x_intercept = (-z + src_width) / affine[0];
-      xi = ceil (x_intercept + EPSILON - 0.5);
-      if (xi > x0)
-       x0 = xi;
-      x_intercept = -z / affine[0];
-      xi = ceil (x_intercept - EPSILON - 0.5);
-      if (xi < x1)
-       x1 = xi;
-    }
-  else
-    {
-      z = affine[2] * (y + 0.5) + affine[4];
-      if (z < 0 || z >= src_width)
-       {
-         *p_x1 = *p_x0;
-         return;
-       }
-    }
-
-  /* do top and bottom edges */
-  if (affine[1] > EPSILON)
-    {
-      z = affine[3] * (y + 0.5) + affine[5];
-      x_intercept = -z / affine[1];
-      xi = ceil (x_intercept + EPSILON - 0.5);
-      if (xi > x0)
-       x0 = xi;
-      x_intercept = (-z + src_height) / affine[1];
-      xi = ceil (x_intercept - EPSILON - 0.5);
-      if (xi < x1)
-       x1 = xi;
-    }
-  else if (affine[1] < -EPSILON)
-    {
-      z = affine[3] * (y + 0.5) + affine[5];
-      x_intercept = (-z + src_height) / affine[1];
-      xi = ceil (x_intercept + EPSILON - 0.5);
-      if (xi > x0)
-       x0 = xi;
-      x_intercept = -z / affine[1];
-      xi = ceil (x_intercept - EPSILON - 0.5);
-      if (xi < x1)
-       x1 = xi;
-    }
-  else
-    {
-      z = affine[3] * (y + 0.5) + affine[5];
-      if (z < 0 || z >= src_height)
-       {
-         *p_x1 = *p_x0;
-         return;
-       }
-    }
-
-  *p_x0 = x0;
-  *p_x1 = x1;
-}