Removed all RCS / CVS tags (Id, Header, Date, etc.) from everything.

[mesa.git] / src / mesa / main / histogram.c

diff --git a/src/mesa/main/histogram.c b/src/mesa/main/histogram.c
index 134463956e2e2262d520c72fb53b84c581acb7e9..63b147b00538b7151436252f39597e108713f91a 100644 (file)
--- a/src/mesa/main/histogram.c
+++ b/src/mesa/main/histogram.c
@@ -1,10 +1,9 @@
-/* $Id: histogram.c,v 1.11 2002/10/24 23:57:21 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  5.1
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -30,7 +29,72 @@
 #include "context.h"
 #include "image.h"
 #include "histogram.h"
-#include "mmath.h"
+
+
+/**********************************************************************
+ * Internal functions
+ */
+
+
+/*
+ * Update the min/max values from an array of fragment colors.
+ */
+void
+_mesa_update_minmax(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      /* update mins */
+      if (rgba[i][RCOMP] < ctx->MinMax.Min[RCOMP])
+         ctx->MinMax.Min[RCOMP] = rgba[i][RCOMP];
+      if (rgba[i][GCOMP] < ctx->MinMax.Min[GCOMP])
+         ctx->MinMax.Min[GCOMP] = rgba[i][GCOMP];
+      if (rgba[i][BCOMP] < ctx->MinMax.Min[BCOMP])
+         ctx->MinMax.Min[BCOMP] = rgba[i][BCOMP];
+      if (rgba[i][ACOMP] < ctx->MinMax.Min[ACOMP])
+         ctx->MinMax.Min[ACOMP] = rgba[i][ACOMP];
+
+      /* update maxs */
+      if (rgba[i][RCOMP] > ctx->MinMax.Max[RCOMP])
+         ctx->MinMax.Max[RCOMP] = rgba[i][RCOMP];
+      if (rgba[i][GCOMP] > ctx->MinMax.Max[GCOMP])
+         ctx->MinMax.Max[GCOMP] = rgba[i][GCOMP];
+      if (rgba[i][BCOMP] > ctx->MinMax.Max[BCOMP])
+         ctx->MinMax.Max[BCOMP] = rgba[i][BCOMP];
+      if (rgba[i][ACOMP] > ctx->MinMax.Max[ACOMP])
+         ctx->MinMax.Max[ACOMP] = rgba[i][ACOMP];
+   }
+}
+
+
+/*
+ * Update the histogram values from an array of fragment colors.
+ */
+void
+_mesa_update_histogram(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+   const GLint max = ctx->Histogram.Width - 1;
+   GLfloat w = (GLfloat) max;
+   GLuint i;
+
+   if (ctx->Histogram.Width == 0)
+      return;
+
+   for (i = 0; i < n; i++) {
+      GLint ri = IROUND(rgba[i][RCOMP] * w);
+      GLint gi = IROUND(rgba[i][GCOMP] * w);
+      GLint bi = IROUND(rgba[i][BCOMP] * w);
+      GLint ai = IROUND(rgba[i][ACOMP] * w);
+      ri = CLAMP(ri, 0, max);
+      gi = CLAMP(gi, 0, max);
+      bi = CLAMP(bi, 0, max);
+      ai = CLAMP(ai, 0, max);
+      ctx->Histogram.Count[ri][RCOMP]++;
+      ctx->Histogram.Count[gi][GCOMP]++;
+      ctx->Histogram.Count[bi][BCOMP]++;
+      ctx->Histogram.Count[ai][ACOMP]++;
+   }
+}
 
 
 /*
@@ -592,6 +656,12 @@ base_histogram_format( GLenum format )
 }
 
 
+
+/**********************************************************************
+ * API functions
+ */
+
+
 void
 _mesa_GetMinmax(GLenum target, GLboolean reset, GLenum format, GLenum type, GLvoid *values)
 {