📄 histogram.c
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/*
* Mesa 3-D graphics library
* Version: 6.3
*
* Copyright (C) 1999-2004 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.
*/
#include "glheader.h"
#include "bufferobj.h"
#include "colormac.h"
#include "context.h"
#include "image.h"
#include "histogram.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]++;
}
}
/*
* XXX the packed pixel formats haven't been tested.
*/
static void
pack_histogram( GLcontext *ctx,
GLuint n, CONST GLuint rgba[][4],
GLenum format, GLenum type, GLvoid *destination,
const struct gl_pixelstore_attrib *packing )
{
const GLint comps = _mesa_components_in_format(format);
GLuint luminance[MAX_WIDTH];
if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
GLuint i;
for (i = 0; i < n; i++) {
luminance[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
}
}
#define PACK_MACRO(TYPE) \
{ \
GLuint i; \
switch (format) { \
case GL_RED: \
for (i=0;i<n;i++) \
dst[i] = (TYPE) rgba[i][RCOMP]; \
break; \
case GL_GREEN: \
for (i=0;i<n;i++) \
dst[i] = (TYPE) rgba[i][GCOMP]; \
break; \
case GL_BLUE: \
for (i=0;i<n;i++) \
dst[i] = (TYPE) rgba[i][BCOMP]; \
break; \
case GL_ALPHA: \
for (i=0;i<n;i++) \
dst[i] = (TYPE) rgba[i][ACOMP]; \
break; \
case GL_LUMINANCE: \
for (i=0;i<n;i++) \
dst[i] = (TYPE) luminance[i]; \
break; \
case GL_LUMINANCE_ALPHA: \
for (i=0;i<n;i++) { \
dst[i*2+0] = (TYPE) luminance[i]; \
dst[i*2+1] = (TYPE) rgba[i][ACOMP]; \
} \
break; \
case GL_RGB: \
for (i=0;i<n;i++) { \
dst[i*3+0] = (TYPE) rgba[i][RCOMP]; \
dst[i*3+1] = (TYPE) rgba[i][GCOMP]; \
dst[i*3+2] = (TYPE) rgba[i][BCOMP]; \
} \
break; \
case GL_RGBA: \
for (i=0;i<n;i++) { \
dst[i*4+0] = (TYPE) rgba[i][RCOMP]; \
dst[i*4+1] = (TYPE) rgba[i][GCOMP]; \
dst[i*4+2] = (TYPE) rgba[i][BCOMP]; \
dst[i*4+3] = (TYPE) rgba[i][ACOMP]; \
} \
break; \
case GL_BGR: \
for (i=0;i<n;i++) { \
dst[i*3+0] = (TYPE) rgba[i][BCOMP]; \
dst[i*3+1] = (TYPE) rgba[i][GCOMP]; \
dst[i*3+2] = (TYPE) rgba[i][RCOMP]; \
} \
break; \
case GL_BGRA: \
for (i=0;i<n;i++) { \
dst[i*4+0] = (TYPE) rgba[i][BCOMP]; \
dst[i*4+1] = (TYPE) rgba[i][GCOMP]; \
dst[i*4+2] = (TYPE) rgba[i][RCOMP]; \
dst[i*4+3] = (TYPE) rgba[i][ACOMP]; \
} \
break; \
case GL_ABGR_EXT: \
for (i=0;i<n;i++) { \
dst[i*4+0] = (TYPE) rgba[i][ACOMP]; \
dst[i*4+1] = (TYPE) rgba[i][BCOMP]; \
dst[i*4+2] = (TYPE) rgba[i][GCOMP]; \
dst[i*4+3] = (TYPE) rgba[i][RCOMP]; \
} \
break; \
default: \
_mesa_problem(ctx, "bad format in pack_histogram"); \
} \
}
switch (type) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) destination;
PACK_MACRO(GLubyte);
}
break;
case GL_BYTE:
{
GLbyte *dst = (GLbyte *) destination;
PACK_MACRO(GLbyte);
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort *dst = (GLushort *) destination;
PACK_MACRO(GLushort);
if (packing->SwapBytes) {
_mesa_swap2(dst, n * comps);
}
}
break;
case GL_SHORT:
{
GLshort *dst = (GLshort *) destination;
PACK_MACRO(GLshort);
if (packing->SwapBytes) {
_mesa_swap2((GLushort *) dst, n * comps);
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint *dst = (GLuint *) destination;
PACK_MACRO(GLuint);
if (packing->SwapBytes) {
_mesa_swap4(dst, n * comps);
}
}
break;
case GL_INT:
{
GLint *dst = (GLint *) destination;
PACK_MACRO(GLint);
if (packing->SwapBytes) {
_mesa_swap4((GLuint *) dst, n * comps);
}
}
break;
case GL_FLOAT:
{
GLfloat *dst = (GLfloat *) destination;
PACK_MACRO(GLfloat);
if (packing->SwapBytes) {
_mesa_swap4((GLuint *) dst, n * comps);
}
}
break;
case GL_HALF_FLOAT_ARB:
{
/* temporarily store as GLuints */
GLuint temp[4*HISTOGRAM_TABLE_SIZE];
GLhalfARB *dst = (GLhalfARB *) destination;
GLuint i;
/* get GLuint values */
PACK_MACRO(GLuint);
/* convert to GLhalf */
for (i = 0; i < n * comps; i++) {
dst[i] = _mesa_float_to_half((GLfloat) temp[i]);
}
if (packing->SwapBytes) {
_mesa_swap2((GLushort *) dst, n * comps);
}
}
break;
case GL_UNSIGNED_BYTE_3_3_2:
if (format == GL_RGB) {
GLubyte *dst = (GLubyte *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][RCOMP] & 0x7) << 5)
| ((rgba[i][GCOMP] & 0x7) << 2)
| ((rgba[i][BCOMP] & 0x3) );
}
}
else {
GLubyte *dst = (GLubyte *) destination;
GLuint i;
ASSERT(format == GL_BGR);
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][BCOMP] & 0x7) << 5)
| ((rgba[i][GCOMP] & 0x7) << 2)
| ((rgba[i][RCOMP] & 0x3) );
}
}
break;
case GL_UNSIGNED_BYTE_2_3_3_REV:
if (format == GL_RGB) {
GLubyte *dst = (GLubyte *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][RCOMP] & 0x3) << 6)
| ((rgba[i][GCOMP] & 0x7) << 3)
| ((rgba[i][BCOMP] & 0x7) );
}
}
else {
GLubyte *dst = (GLubyte *) destination;
GLuint i;
ASSERT(format == GL_BGR);
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][BCOMP] & 0x3) << 6)
| ((rgba[i][GCOMP] & 0x7) << 3)
| ((rgba[i][RCOMP] & 0x7) );
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5:
if (format == GL_RGB) {
GLushort *dst = (GLushort *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
| ((rgba[i][GCOMP] & 0x3f) << 5)
| ((rgba[i][BCOMP] & 0x1f) );
}
}
else {
GLushort *dst = (GLushort *) destination;
GLuint i;
ASSERT(format == GL_BGR);
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][BCOMP] & 0x1f) << 11)
| ((rgba[i][GCOMP] & 0x3f) << 5)
| ((rgba[i][RCOMP] & 0x1f) );
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5_REV:
if (format == GL_RGB) {
GLushort *dst = (GLushort *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][BCOMP] & 0x1f) << 11)
| ((rgba[i][GCOMP] & 0x3f) << 5)
| ((rgba[i][RCOMP] & 0x1f) );
}
}
else {
GLushort *dst = (GLushort *) destination;
GLuint i;
ASSERT(format == GL_BGR);
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][RCOMP] & 0x1f) << 11)
| ((rgba[i][GCOMP] & 0x3f) << 5)
| ((rgba[i][BCOMP] & 0x1f) );
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4:
if (format == GL_RGBA) {
GLushort *dst = (GLushort *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][RCOMP] & 0xf) << 12)
| ((rgba[i][GCOMP] & 0xf) << 8)
| ((rgba[i][BCOMP] & 0xf) << 4)
| ((rgba[i][ACOMP] & 0xf) );
}
}
else if (format == GL_BGRA) {
GLushort *dst = (GLushort *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][BCOMP] & 0xf) << 12)
| ((rgba[i][GCOMP] & 0xf) << 8)
| ((rgba[i][RCOMP] & 0xf) << 4)
| ((rgba[i][ACOMP] & 0xf) );
}
}
else {
GLushort *dst = (GLushort *) destination;
GLuint i;
ASSERT(format == GL_ABGR_EXT);
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][ACOMP] & 0xf) << 12)
| ((rgba[i][BCOMP] & 0xf) << 8)
| ((rgba[i][GCOMP] & 0xf) << 4)
| ((rgba[i][RCOMP] & 0xf) );
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
if (format == GL_RGBA) {
GLushort *dst = (GLushort *) destination;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = ((rgba[i][ACOMP] & 0xf) << 12)
| ((rgba[i][BCOMP] & 0xf) << 8)
| ((rgba[i][GCOMP] & 0xf) << 4)
| ((rgba[i][RCOMP] & 0xf) );
}
}
else if (format == GL_BGRA) {
GLushort *dst = (GLushort *) destination;
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