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/* $Id: pixel.c,v 1.3 1996/09/26 22:35:10 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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 Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: pixel.c,v $
* Revision 1.3 1996/09/26 22:35:10 brianp
* fixed a few compiler warnings from IRIX 6 -n32 and -64 compiler
*
* Revision 1.2 1996/09/15 14:18:55 brianp
* now use GLframebuffer and GLvisual
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
/*
* glPixelStore, glPixelTransfer, glPixelMap, glPixelZoom, etc.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "context.h"
#include "dlist.h"
#include "macros.h"
#include "pixel.h"
#include "image.h"
#include "span.h"
#include "stencil.h"
#include "types.h"
/*
* Determine if we can use the optimized glDrawPixels function.
*/
static void update_drawpixels_state( GLcontext *ctx )
{
if (ctx->Visual->RGBAflag==GL_TRUE &&
ctx->Visual->EightBitColor &&
ctx->Pixel.RedBias==0.0 && ctx->Pixel.RedScale==1.0 &&
ctx->Pixel.GreenBias==0.0 && ctx->Pixel.GreenScale==1.0 &&
ctx->Pixel.BlueBias==0.0 && ctx->Pixel.BlueScale==1.0 &&
ctx->Pixel.AlphaBias==0.0 && ctx->Pixel.AlphaScale==1.0 &&
ctx->Pixel.MapColorFlag==GL_FALSE &&
ctx->Pixel.ZoomX==1.0 && ctx->Pixel.ZoomY==1.0 &&
/* ctx->Unpack.Alignment==4 &&*/
ctx->Unpack.RowLength==0 &&
ctx->Unpack.SkipPixels==0 &&
ctx->Unpack.SkipRows==0 &&
ctx->Unpack.SwapBytes==0 &&
ctx->Unpack.LsbFirst==0) {
ctx->FastDrawPixels = GL_TRUE;
}
else {
ctx->FastDrawPixels = GL_FALSE;
}
}
/**********************************************************************/
/***** glPixelZoom *****/
/**********************************************************************/
void gl_PixelZoom( GLcontext *ctx, GLfloat xfactor, GLfloat yfactor )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPixelZoom" );
return;
}
ctx->Pixel.ZoomX = xfactor;
ctx->Pixel.ZoomY = yfactor;
update_drawpixels_state( ctx );
}
/*
* Write a span of pixels to the frame buffer while applying a pixel zoom.
* This is only used by glDrawPixels and glCopyPixels.
* Input: n - number of pixels in input row
* x, y - destination of the span
* z - depth values for the span
* red, green, blue, alpha - array of colors
* y0 - location of first row in the image we're drawing.
*/
void
gl_write_zoomed_color_span( GLcontext *ctx,
GLuint n, GLint x, GLint y, const GLdepth z[],
const GLubyte red[], const GLubyte green[],
const GLubyte blue[], const GLubyte alpha[],
GLint y0 )
{
GLint m;
GLint r0, r1, row, r;
GLint i, j, skipcol;
GLubyte zred[MAX_WIDTH], zgreen[MAX_WIDTH]; /* zoomed pixel colors */
GLubyte zblue[MAX_WIDTH], zalpha[MAX_WIDTH];
GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
/* compute width of output row */
m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
if (m==0) {
return;
}
if (ctx->Pixel.ZoomX<0.0) {
/* adjust x coordinate for left/right mirroring */
x = x - m;
}
/* compute which rows to draw */
row = y-y0;
r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
if (r0==r1) {
return;
}
else if (r1<r0) {
GLint rtmp = r1;
r1 = r0;
r0 = rtmp;
}
/* return early if r0...r1 is above or below window */
if (r0<0 && r1<0) {
/* below window */
return;
}
if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
/* above window */
return;
}
/* check if left edge is outside window */
skipcol = 0;
if (x<0) {
skipcol = -x;
m += x;
}
/* make sure span isn't too long or short */
if (m>maxwidth) {
m = maxwidth;
}
else if (m<=0) {
return;
}
assert( m <= MAX_WIDTH );
/* zoom the span horizontally */
if (ctx->Pixel.ZoomX==-1.0F) {
/* n==m */
for (j=0;j<m;j++) {
i = n - (j+skipcol) - 1;
zred[j] = red[i];
zgreen[j] = green[i];
zblue[j] = blue[i];
zalpha[j] = alpha[i];
zdepth[j] = z[i];
}
}
else {
GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j=0;j<m;j++) {
i = (j+skipcol) * xscale;
if (i<0) i = n + i - 1;
zred[j] = red[i];
zgreen[j] = green[i];
zblue[j] = blue[i];
zalpha[j] = alpha[i];
zdepth[j] = z[i];
}
}
/* write the span */
for (r=r0; r<r1; r++) {
gl_write_color_span( ctx, m, x+skipcol, r, zdepth,
zred, zgreen, zblue, zalpha, GL_BITMAP );
}
}
/*
* As above, but write CI pixels.
*/
void
gl_write_zoomed_index_span( GLcontext *ctx,
GLuint n, GLint x, GLint y, const GLdepth z[],
const GLuint indexes[], GLint y0 )
{
GLint m;
GLint r0, r1, row, r;
GLint i, j, skipcol;
GLuint zindexes[MAX_WIDTH]; /* zoomed color indexes */
GLdepth zdepth[MAX_WIDTH]; /* zoomed depth values */
GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
/* compute width of output row */
m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
if (m==0) {
return;
}
if (ctx->Pixel.ZoomX<0.0) {
/* adjust x coordinate for left/right mirroring */
x = x - m;
}
/* compute which rows to draw */
row = y-y0;
r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
if (r0==r1) {
return;
}
else if (r1<r0) {
GLint rtmp = r1;
r1 = r0;
r0 = rtmp;
}
/* return early if r0...r1 is above or below window */
if (r0<0 && r1<0) {
/* below window */
return;
}
if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
/* above window */
return;
}
/* check if left edge is outside window */
skipcol = 0;
if (x<0) {
skipcol = -x;
m += x;
}
/* make sure span isn't too long or short */
if (m>maxwidth) {
m = maxwidth;
}
else if (m<=0) {
return;
}
assert( m <= MAX_WIDTH );
/* zoom the span horizontally */
if (ctx->Pixel.ZoomX==-1.0F) {
/* n==m */
for (j=0;j<m;j++) {
i = n - (j+skipcol) - 1;
zindexes[j] = indexes[i];
zdepth[j] = z[i];
}
}
else {
GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j=0;j<m;j++) {
i = (j+skipcol) * xscale;
if (i<0) i = n + i - 1;
zindexes[j] = indexes[i];
zdepth[j] = z[i];
}
}
/* write the span */
for (r=r0; r<r1; r++) {
gl_write_index_span( ctx, m, x+skipcol, r, zdepth, zindexes, GL_BITMAP );
}
}
/*
* As above, but write stencil values.
*/
void
gl_write_zoomed_stencil_span( GLcontext *ctx,
GLuint n, GLint x, GLint y,
const GLubyte stencil[], GLint y0 )
{
GLint m;
GLint r0, r1, row, r;
GLint i, j, skipcol;
GLubyte zstencil[MAX_WIDTH]; /* zoomed stencil values */
GLint maxwidth = MIN2( ctx->Buffer->Width, MAX_WIDTH );
/* compute width of output row */
m = (GLint) ABSF( n * ctx->Pixel.ZoomX );
if (m==0) {
return;
}
if (ctx->Pixel.ZoomX<0.0) {
/* adjust x coordinate for left/right mirroring */
x = x - m;
}
/* compute which rows to draw */
row = y-y0;
r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
if (r0==r1) {
return;
}
else if (r1<r0) {
GLint rtmp = r1;
r1 = r0;
r0 = rtmp;
}
/* return early if r0...r1 is above or below window */
if (r0<0 && r1<0) {
/* below window */
return;
}
if (r0>=ctx->Buffer->Height && r1>=ctx->Buffer->Height) {
/* above window */
return;
}
/* check if left edge is outside window */
skipcol = 0;
if (x<0) {
skipcol = -x;
m += x;
}
/* make sure span isn't too long or short */
if (m>maxwidth) {
m = maxwidth;
}
else if (m<=0) {
return;
}
assert( m <= MAX_WIDTH );
/* zoom the span horizontally */
if (ctx->Pixel.ZoomX==-1.0F) {
/* n==m */
for (j=0;j<m;j++) {
i = n - (j+skipcol) - 1;
zstencil[j] = stencil[i];
}
}
else {
GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j=0;j<m;j++) {
i = (j+skipcol) * xscale;
if (i<0) i = n + i - 1;
zstencil[j] = stencil[i];
}
}
/* write the span */
for (r=r0; r<r1; r++) {
gl_write_stencil_span( ctx, m, x+skipcol, r, zstencil );
}
}
/**********************************************************************/
/***** glPixelStore *****/
/**********************************************************************/
void gl_PixelStorei( GLcontext *ctx, GLenum pname, GLint param )
{
/* NOTE: this call can't be compiled into the display list */
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPixelStore" );
return;
}
switch (pname) {
case GL_PACK_SWAP_BYTES:
ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
break;
case GL_PACK_LSB_FIRST:
ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
break;
case GL_PACK_ROW_LENGTH:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Pack.RowLength = param;
}
break;
case GL_PACK_SKIP_PIXELS:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Pack.SkipPixels = param;
}
break;
case GL_PACK_SKIP_ROWS:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Pack.SkipRows = param;
}
break;
case GL_PACK_ALIGNMENT:
if (param==1 || param==2 || param==4 || param==8) {
ctx->Pack.Alignment = param;
}
else {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
break;
case GL_UNPACK_SWAP_BYTES:
ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
break;
case GL_UNPACK_LSB_FIRST:
ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
break;
case GL_UNPACK_ROW_LENGTH:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Unpack.RowLength = param;
}
break;
case GL_UNPACK_SKIP_PIXELS:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Unpack.SkipPixels = param;
}
break;
case GL_UNPACK_SKIP_ROWS:
if (param<0) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
}
else {
ctx->Unpack.SkipRows = param;
}
break;
case GL_UNPACK_ALIGNMENT:
if (param==1 || param==2 || param==4 || param==8) {
ctx->Unpack.Alignment = param;
}
else {
gl_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
}
update_drawpixels_state( ctx );
}
/**********************************************************************/
/***** glPixelMap *****/
/**********************************************************************/
void gl_PixelMapfv( GLcontext *ctx,
GLenum map, GLint mapsize, const GLfloat *values )
{
GLuint i;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPixelMapfv" );
return;
}
if (mapsize<0 || mapsize>MAX_PIXEL_MAP_TABLE) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
return;
}
if (map>=GL_PIXEL_MAP_S_TO_S && map<=GL_PIXEL_MAP_I_TO_A) {
/* test that mapsize is a power of two */
GLuint p;
GLboolean ok = GL_FALSE;
for (p=1; p<=MAX_PIXEL_MAP_TABLE; p=p<<1) {
if ( (p&mapsize) == p ) {
ok = GL_TRUE;
break;
}
}
if (!ok) {
gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
}
}
switch (map) {
case GL_PIXEL_MAP_S_TO_S:
ctx->Pixel.MapStoSsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapStoS[i] = (GLint) values[i];
}
break;
case GL_PIXEL_MAP_I_TO_I:
ctx->Pixel.MapItoIsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapItoI[i] = (GLint) values[i];
}
break;
case GL_PIXEL_MAP_I_TO_R:
ctx->Pixel.MapItoRsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapItoR[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_I_TO_G:
ctx->Pixel.MapItoGsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapItoG[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_I_TO_B:
ctx->Pixel.MapItoBsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapItoB[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_I_TO_A:
ctx->Pixel.MapItoAsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapItoA[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_R_TO_R:
ctx->Pixel.MapRtoRsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapRtoR[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_G_TO_G:
ctx->Pixel.MapGtoGsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapGtoG[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_B_TO_B:
ctx->Pixel.MapBtoBsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapBtoB[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
case GL_PIXEL_MAP_A_TO_A:
ctx->Pixel.MapAtoAsize = mapsize;
for (i=0;i<mapsize;i++) {
ctx->Pixel.MapAtoA[i] = CLAMP( values[i], 0.0, 1.0 );
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glPixelMapfv(map)" );
}
}
void gl_GetPixelMapfv( GLcontext *ctx, GLenum map, GLfloat *values )
{
GLuint i;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
return;
}
switch (map) {
case GL_PIXEL_MAP_I_TO_I:
for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
values[i] = (GLfloat) ctx->Pixel.MapItoI[i];
}
break;
case GL_PIXEL_MAP_S_TO_S:
for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
values[i] = (GLfloat) ctx->Pixel.MapStoS[i];
}
break;
case GL_PIXEL_MAP_I_TO_R:
MEMCPY(values,ctx->Pixel.MapItoR,ctx->Pixel.MapItoRsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_I_TO_G:
MEMCPY(values,ctx->Pixel.MapItoG,ctx->Pixel.MapItoGsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_I_TO_B:
MEMCPY(values,ctx->Pixel.MapItoB,ctx->Pixel.MapItoBsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_I_TO_A:
MEMCPY(values,ctx->Pixel.MapItoA,ctx->Pixel.MapItoAsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_R_TO_R:
MEMCPY(values,ctx->Pixel.MapRtoR,ctx->Pixel.MapRtoRsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_G_TO_G:
MEMCPY(values,ctx->Pixel.MapGtoG,ctx->Pixel.MapGtoGsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_B_TO_B:
MEMCPY(values,ctx->Pixel.MapBtoB,ctx->Pixel.MapBtoBsize*sizeof(GLfloat));
break;
case GL_PIXEL_MAP_A_TO_A:
MEMCPY(values,ctx->Pixel.MapAtoA,ctx->Pixel.MapAtoAsize*sizeof(GLfloat));
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
}
}
void gl_GetPixelMapuiv( GLcontext *ctx, GLenum map, GLuint *values )
{
GLuint i;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
return;
}
switch (map) {
case GL_PIXEL_MAP_I_TO_I:
MEMCPY(values, ctx->Pixel.MapItoI, ctx->Pixel.MapItoIsize*sizeof(GLint));
break;
case GL_PIXEL_MAP_S_TO_S:
MEMCPY(values, ctx->Pixel.MapStoS, ctx->Pixel.MapStoSsize*sizeof(GLint));
break;
case GL_PIXEL_MAP_I_TO_R:
for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoR[i] );
}
break;
case GL_PIXEL_MAP_I_TO_G:
for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoG[i] );
}
break;
case GL_PIXEL_MAP_I_TO_B:
for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoB[i] );
}
break;
case GL_PIXEL_MAP_I_TO_A:
for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoA[i] );
}
break;
case GL_PIXEL_MAP_R_TO_R:
for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapRtoR[i] );
}
break;
case GL_PIXEL_MAP_G_TO_G:
for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapGtoG[i] );
}
break;
case GL_PIXEL_MAP_B_TO_B:
for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapBtoB[i] );
}
break;
case GL_PIXEL_MAP_A_TO_A:
for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
values[i] = FLOAT_TO_UINT( ctx->Pixel.MapAtoA[i] );
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
}
}
void gl_GetPixelMapusv( GLcontext *ctx, GLenum map, GLushort *values )
{
GLuint i;
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glGetPixelMapfv" );
return;
}
switch (map) {
case GL_PIXEL_MAP_I_TO_I:
for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
values[i] = (GLushort) ctx->Pixel.MapItoI[i];
}
break;
case GL_PIXEL_MAP_S_TO_S:
for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
values[i] = (GLushort) ctx->Pixel.MapStoS[i];
}
break;
case GL_PIXEL_MAP_I_TO_R:
for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoR[i] );
}
break;
case GL_PIXEL_MAP_I_TO_G:
for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoG[i] );
}
break;
case GL_PIXEL_MAP_I_TO_B:
for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoB[i] );
}
break;
case GL_PIXEL_MAP_I_TO_A:
for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoA[i] );
}
break;
case GL_PIXEL_MAP_R_TO_R:
for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapRtoR[i] );
}
break;
case GL_PIXEL_MAP_G_TO_G:
for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapGtoG[i] );
}
break;
case GL_PIXEL_MAP_B_TO_B:
for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapBtoB[i] );
}
break;
case GL_PIXEL_MAP_A_TO_A:
for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapAtoA[i] );
}
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
}
}
/**********************************************************************/
/***** glPixelTransfer *****/
/**********************************************************************/
/*
* Implements glPixelTransfer[fi] whether called immediately or from a
* display list.
*/
void gl_PixelTransferf( GLcontext *ctx, GLenum pname, GLfloat param )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glPixelTransfer" );
return;
}
switch (pname) {
case GL_MAP_COLOR:
ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
break;
case GL_MAP_STENCIL:
ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
break;
case GL_INDEX_SHIFT:
ctx->Pixel.IndexShift = (GLint) param;
break;
case GL_INDEX_OFFSET:
ctx->Pixel.IndexOffset = (GLint) param;
break;
case GL_RED_SCALE:
ctx->Pixel.RedScale = param;
break;
case GL_RED_BIAS:
ctx->Pixel.RedBias = param;
break;
case GL_GREEN_SCALE:
ctx->Pixel.GreenScale = param;
break;
case GL_GREEN_BIAS:
ctx->Pixel.GreenBias = param;
break;
case GL_BLUE_SCALE:
ctx->Pixel.BlueScale = param;
break;
case GL_BLUE_BIAS:
ctx->Pixel.BlueBias = param;
break;
case GL_ALPHA_SCALE:
ctx->Pixel.AlphaScale = param;
break;
case GL_ALPHA_BIAS:
ctx->Pixel.AlphaBias = param;
break;
case GL_DEPTH_SCALE:
ctx->Pixel.DepthScale = param;
break;
case GL_DEPTH_BIAS:
ctx->Pixel.DepthBias = param;
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
return;
}
update_drawpixels_state( ctx );
}
/**********************************************************************/
/***** Pixel packing/unpacking *****/
/**********************************************************************/
/*
* Unpack a 2-D pixel array/image. The unpacked format will be con-
* tiguous (no "empty" bytes) with byte/bit swapping applied as needed.
* Input: same as glDrawPixels
* Output: pointer to block of pixel data in same format and type as input
* or NULL if error.
*/
GLvoid *gl_unpack_pixels( GLcontext *ctx,
GLsizei width, GLsizei height,\
GLenum format, GLenum type,
const GLvoid *pixels )
{
GLint s, n;
s = gl_sizeof_type( type );
if (s<0) {
gl_error( ctx, GL_INVALID_ENUM, "internal error in gl_unpack(type)" );
return NULL;
}
n = gl_components_in_format( format );
if (n<0) {
gl_error( ctx, GL_INVALID_ENUM, "gl_unpack_pixels(format)" );
return NULL;
}
if (type==GL_BITMAP) {
/* BITMAP data */
GLint bytes, i, width_in_bytes;
GLubyte *buffer, *dst;
GLvoid *src;
/* Alloc dest storage */
bytes = CEILING( width * height , 8 );
buffer = (GLubyte *) malloc( bytes );
if (!buffer) {
return NULL;
}
/* Copy/unpack pixel data to buffer */
width_in_bytes = CEILING( width, 8 );
dst = buffer;
for (i=0;i<height;i++) {
src = gl_pixel_addr_in_image( ctx, pixels, width, height,
format, type, GL_FALSE, i, 0 );
if (!src) {
free(buffer);
return NULL;
}
MEMCPY( dst, src, width_in_bytes );
dst += width_in_bytes;
}
/* Bit flipping */
if (ctx->Unpack.LsbFirst) {
gl_flip_bytes( buffer, bytes );
}
return (GLvoid *) buffer;
}
else {
/* Non-BITMAP data */
GLint width_in_bytes, bytes, i;
GLubyte *buffer, *dst;
GLvoid *src;
width_in_bytes = width * n * s;
/* Alloc dest storage */
bytes = height * width_in_bytes;
buffer = (GLubyte *) malloc( bytes );
if (!buffer) {
return NULL;
}
/* Copy/unpack pixel data to buffer */
dst = buffer;
for (i=0;i<height;i++) {
src = gl_pixel_addr_in_image( ctx, pixels, width, height,
format, type, GL_FALSE, i, 0 );
if (!src) {
free(buffer);
return NULL;
}
MEMCPY( dst, src, width_in_bytes );
dst += width_in_bytes;
}
/* Byte swapping */
if (ctx->Unpack.SwapBytes && s>1) {
if (s==2) {
gl_swap2( (GLushort *) buffer, bytes/2 );
}
else if (s==4) {
gl_swap4( (GLuint *) buffer, bytes/4 );
}
}
return (GLvoid *) buffer;
}
}
/*
if (s>=a) {
k = n * l;
}
else { *s<a*
k = (a/s) * ceil( s*n*l / a );
}
s = size in bytes of a single component
a = alignment
n = number of components in a pixel
l = number of pixels in a row
k = number of components or indices between first pixel in each row in mem.
*/
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.