libgimp/Makefile.am libgimp/gimp.h libgimp/gimpadaptivesupersample.[ch]

2001-01-23 Michael Natterer <mitch@gimp.org> * libgimp/Makefile.am * libgimp/gimp.h * libgimp/gimpadaptivesupersample.[ch] * libgimp/gimpbilinear.[ch]: new files cut out of LibGCK. * plug-ins/libgck/gck/gck.h * plug-ins/libgck/gck/gckcolor.c: removed the bilinear and supersample code. * app/apptypes.h * app/asupsample.[ch] * app/tools/blend.c: made the adaptive_supersample interface the same as in libgimp but don't use the libgimp function yet. The libgimp function takes total transparancy into account when weighting the 4 resulting RGBA values, the app function always weights them equally. Please have a look at the code. * plug-ins/Lighting/lighting_image.c * plug-ins/MapObject/mapobject_apply.c * plug-ins/MapObject/mapobject_image.[ch]: changed accordingly. * app/disp_callbacks.c: paranoia cleanups.
2025-07-03 09:23:24 +00:00 · 2001-01-23 00:53:12 +00:00 · 2001-01-23 00:53:12 +00:00 · 75760de9d1
commit 75760de9d1
parent 5591b7cd2d
26 changed files with 1856 additions and 897 deletions
--- a/libgimpcolor/gimpbilinear.c
+++ b/libgimpcolor/gimpbilinear.c
@ -0,0 +1,222 @@
+/* LIBGIMP - The GIMP Library 
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball                
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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 Lesser 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 <glib.h>
+
+#include "gimpcolor.h"
+#include "gimpbilinear.h"
+#include "gimpmath.h"
+
+
+gdouble
+gimp_bilinear (gdouble  x,
+	       gdouble  y,
+	       gdouble *values)
+{
+  gdouble xx, yy;
+  gdouble m0, m1;
+
+  g_assert (values != NULL);
+
+  xx = fmod (x, 1.0);
+  yy = fmod (y, 1.0);
+
+  if (x < 0.0)
+    x += 1.0;
+  if (y < 0.0)
+    y += 1.0;
+
+  m0 = (1.0 - xx) * values[0] + xx * values[1];
+  m1 = (1.0 - xx) * values[2] + xx * values[3];
+
+  return (1.0 - yy) * m0 + yy * m1;
+}
+
+guchar
+gimp_bilinear_8 (gdouble x,
+		 gdouble y,
+		 guchar *values)
+{
+  gdouble xx, yy;
+  gdouble m0, m1;
+
+  g_assert (values != NULL);
+
+  xx = fmod (x, 1.0);
+  yy = fmod (y, 1.0);
+
+  if (x < 0.0)
+    x += 1.0;
+  if (y < 0.0)
+    y += 1.0;
+
+  m0 = (1.0 - xx) * values[0] + xx * values[1];
+  m1 = (1.0 - xx) * values[2] + xx * values[3];
+
+  return (guchar) ((1.0 - yy) * m0 + yy * m1);
+}
+
+guint16
+gimp_bilinear_16 (gdouble  x,
+		  gdouble  y,
+		  guint16 *values)
+{
+  gdouble xx, yy;
+  gdouble m0, m1;
+
+  g_assert (values != NULL);
+
+  xx = fmod (x, 1.0);
+  yy = fmod (y, 1.0);
+
+  if (x < 0.0)
+    x += 1.0;
+  if (y < 0.0)
+    y += 1.0;
+
+  m0 = (1.0 - xx) * values[0] + xx * values[1];
+  m1 = (1.0 - xx) * values[2] + xx * values[3];
+
+  return (guint16) ((1.0 - yy) * m0 + yy * m1);
+}
+
+guint32
+gimp_bilinear_32 (gdouble  x,
+		  gdouble  y,
+		  guint32 *values)
+{
+  gdouble xx, yy;
+  gdouble m0, m1;
+
+  g_assert (values != NULL);
+
+  xx = fmod (x, 1.0);
+  yy = fmod (y, 1.0);
+
+  if (x < 0.0)
+    x += 1.0;
+  if (y < 0.0)
+    y += 1.0;
+
+  m0 = (1.0 - xx) * values[0] + xx * values[1];
+  m1 = (1.0 - xx) * values[2] + xx * values[3];
+
+  return (guint32) ((1.0 - yy) * m0 + yy * m1);
+}
+
+GimpRGB
+gimp_bilinear_rgb (gdouble  x,
+		   gdouble  y,
+		   GimpRGB *values)
+{
+  gdouble m0, m1;
+  gdouble ix, iy;
+  GimpRGB v;
+
+  g_assert (values != NULL);
+
+  x = fmod(x, 1.0);
+  y = fmod(y, 1.0);
+
+  if (x < 0)
+    x += 1.0;
+  if (y < 0)
+    y += 1.0;
+
+  ix = 1.0 - x;
+  iy = 1.0 - y;
+
+  /* Red */
+
+  m0 = ix * values[0].r + x * values[1].r;
+  m1 = ix * values[2].r + x * values[3].r;
+
+  v.r = iy * m0 + y * m1;
+
+  /* Green */
+
+  m0 = ix * values[0].g + x * values[1].g;
+  m1 = ix * values[2].g + x * values[3].g;
+
+  v.g = iy * m0 + y * m1;
+
+  /* Blue */
+
+  m0 = ix * values[0].b + x * values[1].b;
+  m1 = ix * values[2].b + x * values[3].b;
+
+  v.b = iy * m0 + y * m1;
+
+  return v;
+}
+
+GimpRGB
+gimp_bilinear_rgba (gdouble  x,
+		    gdouble  y,
+		    GimpRGB *values)
+{
+  gdouble m0, m1;
+  gdouble ix, iy;
+  GimpRGB v;
+
+  g_assert (values != NULL);
+
+  x = fmod (x, 1.0);
+  y = fmod (y, 1.0);
+
+  if (x < 0)
+    x += 1.0;
+  if (y < 0)
+    y += 1.0;
+
+  ix = 1.0 - x;
+  iy = 1.0 - y;
+
+  /* Red */
+
+  m0 = ix * values[0].r + x * values[1].r;
+  m1 = ix * values[2].r + x * values[3].r;
+
+  v.r = iy * m0 + y * m1;
+
+  /* Green */
+
+  m0 = ix * values[0].g + x * values[1].g;
+  m1 = ix * values[2].g + x * values[3].g;
+
+  v.g = iy * m0 + y * m1;
+
+  /* Blue */
+
+  m0 = ix * values[0].b + x * values[1].b;
+  m1 = ix * values[2].b + x * values[3].b;
+
+  v.b = iy * m0 + y * m1;
+
+  /* Alpha */
+
+  m0 = ix * values[0].a + x * values[1].a;
+  m1 = ix * values[2].a + x * values[3].a;
+
+  v.a = iy * m0 + y * m1;
+
+  return v;
+}