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/* $Id: s_imaging.c,v 1.2 2000/11/05 18:24:40 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_context.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]++;
}
}
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