1 files changed, 105 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_imaging.c b/src/mesa/swrast/s_imaging.c
new file mode 100644
index 0000000000..672d163d8c
--- /dev/null
+++ b/src/mesa/swrast/s_imaging.c
@@ -0,0 +1,105 @@
+/* $Id: s_imaging.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.4
+ *
+ * Copyright (C) 1999-2000  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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Histogram, Min/max and convolution for GL_ARB_imaging subset
+ *
+ */
+
+
+#include "glheader.h"
+#include "colormac.h"
+#include "image.h"
+#include "mmath.h"
+
+#include "s_imaging.h"
+#include "s_span.h"
+
+
+
+/*
+ * 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 = (GLint) (rgba[i][RCOMP] * w + 0.5F);
+      GLint gi = (GLint) (rgba[i][GCOMP] * w + 0.5F);
+      GLint bi = (GLint) (rgba[i][BCOMP] * w + 0.5F);
+      GLint ai = (GLint) (rgba[i][ACOMP] * w + 0.5F);
+      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]++;
+   }
+}
+
+
+