WebSVN - shark - Rev 1618 - /shark/branches/xen/ports/mesa/src/image.c

/* $Id: image.c,v 1.1 2003-02-28 11:42:02 pj Exp $ */

/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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 "colormac.h"
#include "context.h"
#include "image.h"
#include "imports.h"
#include "histogram.h"
#include "macros.h"
#include "mmath.h"
#include "pixel.h"
#include "mtypes.h"

/*
* These are the image packing parameters for Mesa's internal images.
* That is, _mesa_unpack_image() returns image data in this format.
* When we execute image commands (glDrawPixels, glTexImage, etc)
* from within display lists we have to be sure to set the current
* unpacking params to these values!
*/
const struct gl_pixelstore_attrib _mesa_native_packing = {
1, /* Alignment */
0, /* RowLength */
0, /* SkipPixels */
0, /* SkipRows */
0, /* ImageHeight */
0, /* SkipImages */
GL_FALSE, /* SwapBytes */
GL_FALSE, /* LsbFirst */
GL_FALSE, /* ClientStorage */
GL_FALSE /* Invert */
};

/*
* Flip the 8 bits in each byte of the given array.
*
* XXX try this trick to flip bytes someday:
* v = ((v & 0x55555555) << 1) | ((v >> 1) & 0x55555555);
* v = ((v & 0x33333333) << 2) | ((v >> 2) & 0x33333333);
* v = ((v & 0x0f0f0f0f) << 4) | ((v >> 4) & 0x0f0f0f0f);
*/
static void
flip_bytes( GLubyte *p, GLuint n )
{
register GLuint i, a, b;

for (i=0;i<n;i++) {
b = (GLuint) p[i]; /* words are often faster than bytes */
a = ((b & 0x01) << 7) |
((b & 0x02) << 5) |
((b & 0x04) << 3) |
((b & 0x08) << 1) |
((b & 0x10) >> 1) |
((b & 0x20) >> 3) |
((b & 0x40) >> 5) |
((b & 0x80) >> 7);
p[i] = (GLubyte) a;
}
}

/*
* Flip the order of the 2 bytes in each word in the given array.
*/
void
_mesa_swap2( GLushort *p, GLuint n )
{
register GLuint i;

for (i=0;i<n;i++) {
p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
}
}

/*
* Flip the order of the 4 bytes in each word in the given array.
*/
void
_mesa_swap4( GLuint *p, GLuint n )
{
register GLuint i, a, b;

for (i=0;i<n;i++) {
b = p[i];
a = (b >> 24)
| ((b >> 8) & 0xff00)
| ((b << 8) & 0xff0000)
| ((b << 24) & 0xff000000);
p[i] = a;
}
}

/*
* Return the size, in bytes, of the given GL datatype.
* Return 0 if GL_BITMAP.
* Return -1 if invalid type enum.
*/
GLint _mesa_sizeof_type( GLenum type )
{
switch (type) {
case GL_BITMAP:
return 0;
case GL_UNSIGNED_BYTE:
return sizeof(GLubyte);
case GL_BYTE:
return sizeof(GLbyte);
case GL_UNSIGNED_SHORT:
return sizeof(GLushort);
case GL_SHORT:
return sizeof(GLshort);
case GL_UNSIGNED_INT:
return sizeof(GLuint);
case GL_INT:
return sizeof(GLint);
case GL_FLOAT:
return sizeof(GLfloat);
default:
return -1;
}
}

/*
* Same as _mesa_sizeof_packed_type() but we also accept the
* packed pixel format datatypes.
*/
GLint _mesa_sizeof_packed_type( GLenum type )
{
switch (type) {
case GL_BITMAP:
return 0;
case GL_UNSIGNED_BYTE:
return sizeof(GLubyte);
case GL_BYTE:
return sizeof(GLbyte);
case GL_UNSIGNED_SHORT:
return sizeof(GLushort);
case GL_SHORT:
return sizeof(GLshort);
case GL_UNSIGNED_INT:
return sizeof(GLuint);
case GL_INT:
return sizeof(GLint);
case GL_FLOAT:
return sizeof(GLfloat);
case GL_UNSIGNED_BYTE_3_3_2:
return sizeof(GLubyte);
case GL_UNSIGNED_BYTE_2_3_3_REV:
return sizeof(GLubyte);
case GL_UNSIGNED_SHORT_5_6_5:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_5_6_5_REV:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_4_4_4_4:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_5_5_5_1:
return sizeof(GLushort);
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
return sizeof(GLushort);
case GL_UNSIGNED_INT_8_8_8_8:
return sizeof(GLuint);
case GL_UNSIGNED_INT_8_8_8_8_REV:
return sizeof(GLuint);
case GL_UNSIGNED_INT_10_10_10_2:
return sizeof(GLuint);
case GL_UNSIGNED_INT_2_10_10_10_REV:
return sizeof(GLuint);
case GL_UNSIGNED_SHORT_8_8_MESA:
case GL_UNSIGNED_SHORT_8_8_REV_MESA:
return sizeof(GLushort);
default:
return -1;
}
}

/*
* Return the number of components in a GL enum pixel type.
* Return -1 if bad format.
*/
GLint _mesa_components_in_format( GLenum format )
{
switch (format) {
case GL_COLOR_INDEX:
case GL_COLOR_INDEX1_EXT:
case GL_COLOR_INDEX2_EXT:
case GL_COLOR_INDEX4_EXT:
case GL_COLOR_INDEX8_EXT:
case GL_COLOR_INDEX12_EXT:
case GL_COLOR_INDEX16_EXT:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
case GL_INTENSITY:
return 1;
case GL_LUMINANCE_ALPHA:
return 2;
case GL_RGB:
return 3;
case GL_RGBA:
return 4;
case GL_BGR:
return 3;
case GL_BGRA:
return 4;
case GL_ABGR_EXT:
return 4;
case GL_YCBCR_MESA:
return 2;
default:
return -1;
}
}

/*
* Return bytes per pixel for given format and type
* Return -1 if bad format or type.
*/
GLint _mesa_bytes_per_pixel( GLenum format, GLenum type )
{
GLint comps = _mesa_components_in_format( format );
if (comps < 0)
return -1;

switch (type) {
case GL_BITMAP:
return 0; /* special case */
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return comps * sizeof(GLubyte);
case GL_SHORT:
case GL_UNSIGNED_SHORT:
return comps * sizeof(GLshort);
case GL_INT:
case GL_UNSIGNED_INT:
return comps * sizeof(GLint);
case GL_FLOAT:
return comps * sizeof(GLfloat);
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
if (format == GL_RGB || format == GL_BGR)
return sizeof(GLubyte);
else
return -1; /* error */
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
if (format == GL_RGB || format == GL_BGR)
return sizeof(GLushort);
else
return -1; /* error */
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT)
return sizeof(GLushort);
else
return -1;
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT)
return sizeof(GLuint);
else
return -1;
case GL_UNSIGNED_SHORT_8_8_MESA:
case GL_UNSIGNED_SHORT_8_8_REV_MESA:
if (format == GL_YCBCR_MESA)
return sizeof(GLushort);
else
return -1;
default:
return -1;
}
}

/*
* Test if the given pixel format and type are legal.
* Return GL_TRUE for legal, GL_FALSE for illegal.
*/
GLboolean
_mesa_is_legal_format_and_type( GLenum format, GLenum type )
{
switch (format) {
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
switch (type) {
case GL_BITMAP:
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
default:
return GL_FALSE;
}
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_INTENSITY:
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
case GL_DEPTH_COMPONENT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
return GL_TRUE;
default:
return GL_FALSE;
}
case GL_RGB:
case GL_BGR:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
return GL_TRUE;
default:
return GL_FALSE;
}
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
switch (type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
case GL_SHORT:
case GL_UNSIGNED_SHORT:
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
return GL_TRUE;
default:
return GL_FALSE;
}
case GL_YCBCR_MESA:
if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
return GL_TRUE;
else
return GL_FALSE;
default:
; /* fall-through */
}
return GL_FALSE;
}

/*
* Return the address of a pixel in an image (actually a volume).
* Pixel unpacking/packing parameters are observed according to 'packing'.
* Input: image - start of image data
* width, height - size of image
* format - image format
* type - pixel component type
* packing - the pixelstore attributes
* img - which image in the volume (0 for 1D or 2D images)
* row, column - location of pixel in the image
* Return: address of pixel at (image,row,column) in image or NULL if error.
*/
GLvoid *
_mesa_image_address( const struct gl_pixelstore_attrib *packing,
const GLvoid *image, GLsizei width,
GLsizei height, GLenum format, GLenum type,
GLint img, GLint row, GLint column )
{
GLint alignment; /* 1, 2 or 4 */
GLint pixels_per_row;
GLint rows_per_image;
GLint skiprows;
GLint skippixels;
GLint skipimages; /* for 3-D volume images */
GLubyte *pixel_addr;

alignment = packing->Alignment;
if (packing->RowLength > 0) {
pixels_per_row = packing->RowLength;
}
else {
pixels_per_row = width;
}
if (packing->ImageHeight > 0) {
rows_per_image = packing->ImageHeight;
}
else {
rows_per_image = height;
}
skiprows = packing->SkipRows;
skippixels = packing->SkipPixels;
skipimages = packing->SkipImages;

if (type==GL_BITMAP) {
/* BITMAP data */
GLint comp_per_pixel; /* components per pixel */
GLint bytes_per_comp; /* bytes per component */
GLint bytes_per_row;
GLint bytes_per_image;

/* Compute bytes per component */
bytes_per_comp = _mesa_sizeof_packed_type( type );
if (bytes_per_comp<0) {
return NULL;
}

/* Compute number of components per pixel */
comp_per_pixel = _mesa_components_in_format( format );
if (comp_per_pixel<0 && type != GL_BITMAP) {
return NULL;
}

bytes_per_row = alignment
* CEILING( comp_per_pixel*pixels_per_row, 8*alignment );

bytes_per_image = bytes_per_row * rows_per_image;

pixel_addr = (GLubyte *) image
+ (skipimages + img) * bytes_per_image
+ (skiprows + row) * bytes_per_row
+ (skippixels + column) / 8;
}
else {
/* Non-BITMAP data */
GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
GLint topOfImage;

bytes_per_pixel = _mesa_bytes_per_pixel( format, type );

/* The pixel type and format should have been error checked earlier */
assert(bytes_per_pixel > 0);

bytes_per_row = pixels_per_row * bytes_per_pixel;
remainder = bytes_per_row % alignment;
if (remainder > 0)
bytes_per_row += (alignment - remainder);

ASSERT(bytes_per_row % alignment == 0);

bytes_per_image = bytes_per_row * rows_per_image;

if (packing->Invert) {
/* set pixel_addr to the last row */
topOfImage = bytes_per_row * (height - 1);
bytes_per_row = -bytes_per_row;
}
else {
topOfImage = 0;
}

/* compute final pixel address */
pixel_addr = (GLubyte *) image
+ (skipimages + img) * bytes_per_image
+ topOfImage
+ (skiprows + row) * bytes_per_row
+ (skippixels + column) * bytes_per_pixel;
}

return (GLvoid *) pixel_addr;
}

/*
* Compute the stride between image rows (in bytes) for the given
* pixel packing parameters and image width, format and type.
*/
GLint
_mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLenum format, GLenum type )
{
ASSERT(packing);
if (type == GL_BITMAP) {
/* BITMAP data */
GLint bytes;
if (packing->RowLength == 0) {
bytes = (width + 7) / 8;
}
else {
bytes = (packing->RowLength + 7) / 8;
}
if (packing->Invert) {
/* negate the bytes per row (negative row stride) */
bytes = -bytes;
}
return bytes;
}
else {
/* Non-BITMAP data */
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
GLint bytesPerRow, remainder;
if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
bytesPerRow = bytesPerPixel * width;
}
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
remainder = bytesPerRow % packing->Alignment;
if (remainder > 0)
bytesPerRow += (packing->Alignment - remainder);
if (packing->Invert)
bytesPerRow = -bytesPerRow;
return bytesPerRow;
}
}

/*
* Compute the stride between images in a 3D texture (in bytes) for the given
* pixel packing parameters and image width, format and type.
*/
GLint
_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
GLint width, GLint height,
GLenum format, GLenum type )
{
ASSERT(packing);
ASSERT(type != GL_BITMAP);

{
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
GLint bytesPerRow, bytesPerImage, remainder;

if (bytesPerPixel <= 0)
return -1; /* error */
if (packing->RowLength == 0) {
bytesPerRow = bytesPerPixel * width;
}
else {
bytesPerRow = bytesPerPixel * packing->RowLength;
}
remainder = bytesPerRow % packing->Alignment;
if (remainder > 0)
bytesPerRow += (packing->Alignment - remainder);

if (packing->ImageHeight == 0)
bytesPerImage = bytesPerRow * height;
else
bytesPerImage = bytesPerRow * packing->ImageHeight;

return bytesPerImage;
}
}

/*
* Unpack a 32x32 pixel polygon stipple from user memory using the
* current pixel unpack settings.
*/
void
_mesa_unpack_polygon_stipple( const GLubyte *pattern, GLuint dest[32],
const struct gl_pixelstore_attrib *unpacking )
{
GLubyte *ptrn = (GLubyte *) _mesa_unpack_bitmap( 32, 32, pattern, unpacking );
if (ptrn) {
/* Convert pattern from GLubytes to GLuints and handle big/little
* endian differences
*/
GLubyte *p = ptrn;
GLint i;
for (i = 0; i < 32; i++) {
dest[i] = (p[0] << 24)
| (p[1] << 16)
| (p[2] << 8)
| (p[3] );
p += 4;
}
FREE(ptrn);
}
}

/*
* Pack polygon stipple into user memory given current pixel packing
* settings.
*/
void
_mesa_pack_polygon_stipple( const GLuint pattern[32], GLubyte *dest,
const struct gl_pixelstore_attrib *packing )
{
/* Convert pattern from GLuints to GLubytes to handle big/little
* endian differences.
*/
GLubyte ptrn[32*4];
GLint i;
for (i = 0; i < 32; i++) {
ptrn[i * 4 + 0] = (GLubyte) ((pattern[i] >> 24) & 0xff);
ptrn[i * 4 + 1] = (GLubyte) ((pattern[i] >> 16) & 0xff);
ptrn[i * 4 + 2] = (GLubyte) ((pattern[i] >> 8 ) & 0xff);
ptrn[i * 4 + 3] = (GLubyte) ((pattern[i] ) & 0xff);
}

_mesa_pack_bitmap(32, 32, ptrn, dest, packing);
}

/*
* Unpack bitmap data. Resulting data will be in most-significant-bit-first
* order with row alignment = 1 byte.
*/
GLvoid *
_mesa_unpack_bitmap( GLint width, GLint height, const GLubyte *pixels,
const struct gl_pixelstore_attrib *packing )
{
GLint bytes, row, width_in_bytes;
GLubyte *buffer, *dst;

if (!pixels)
return NULL;

/* Alloc dest storage */
bytes = ((width + 7) / 8 * height);
buffer = (GLubyte *) MALLOC( bytes );
if (!buffer)
return NULL;

width_in_bytes = CEILING( width, 8 );
dst = buffer;
for (row = 0; row < height; row++) {
const GLubyte *src = (const GLubyte *)
_mesa_image_address(packing, pixels, width, height,
GL_COLOR_INDEX, GL_BITMAP, 0, row, 0);
if (!src) {
FREE(buffer);
return NULL;
}

if (packing->SkipPixels == 0) {
MEMCPY( dst, src, width_in_bytes );
if (packing->LsbFirst) {
flip_bytes( dst, width_in_bytes );
}
}
else {
/* handling SkipPixels is a bit tricky (no pun intended!) */
GLint i;
if (packing->LsbFirst) {
GLubyte srcMask = 1 << (packing->SkipPixels & 0x7);
GLubyte dstMask = 128;
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
for (i = 0; i < width; i++) {
if (*s & srcMask) {
*d |= dstMask;
}
if (srcMask == 128) {
srcMask = 1;
s++;
}
else {
srcMask = srcMask << 1;
}
if (dstMask == 1) {
dstMask = 128;
d++;
*d = 0;
}
else {
dstMask = dstMask >> 1;
}
}
}
else {
GLubyte srcMask = 128 >> (packing->SkipPixels & 0x7);
GLubyte dstMask = 128;
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
for (i = 0; i < width; i++) {
if (*s & srcMask) {
*d |= dstMask;
}
if (srcMask == 1) {
srcMask = 128;
s++;
}
else {
srcMask = srcMask >> 1;
}
if (dstMask == 1) {
dstMask = 128;
d++;
*d = 0;
}
else {
dstMask = dstMask >> 1;
}
}
}
}
dst += width_in_bytes;
}

return buffer;
}

/*
* Pack bitmap data.
*/
void
_mesa_pack_bitmap( GLint width, GLint height, const GLubyte *source,
GLubyte *dest, const struct gl_pixelstore_attrib *packing )
{
GLint row, width_in_bytes;
const GLubyte *src;

if (!source)
return;

width_in_bytes = CEILING( width, 8 );
src = source;
for (row = 0; row < height; row++) {
GLubyte *dst = (GLubyte *) _mesa_image_address( packing, dest,
width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
if (!dst)
return;

if (packing->SkipPixels == 0) {
MEMCPY( dst, src, width_in_bytes );
if (packing->LsbFirst) {
flip_bytes( dst, width_in_bytes );
}
}
else {
/* handling SkipPixels is a bit tricky (no pun intended!) */
GLint i;
if (packing->LsbFirst) {
GLubyte srcMask = 1 << (packing->SkipPixels & 0x7);
GLubyte dstMask = 128;
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
for (i = 0; i < width; i++) {
if (*s & srcMask) {
*d |= dstMask;
}
if (srcMask == 128) {
srcMask = 1;
s++;
}
else {
srcMask = srcMask << 1;
}
if (dstMask == 1) {
dstMask = 128;
d++;
*d = 0;
}
else {
dstMask = dstMask >> 1;
}
}
}
else {
GLubyte srcMask = 128 >> (packing->SkipPixels & 0x7);
GLubyte dstMask = 128;
const GLubyte *s = src;
GLubyte *d = dst;
*d = 0;
for (i = 0; i < width; i++) {
if (*s & srcMask) {
*d |= dstMask;
}
if (srcMask == 1) {
srcMask = 128;
s++;
}
else {
srcMask = srcMask >> 1;
}
if (dstMask == 1) {
dstMask = 128;
d++;
*d = 0;
}
else {
dstMask = dstMask >> 1;
}
}
}
}
src += width_in_bytes;
}
}

/*
* Used to pack an array [][4] of RGBA GLchan colors as specified
* by the dstFormat, dstType and dstPacking. Used by glReadPixels,
* glGetConvolutionFilter(), etc.
*/
void
_mesa_pack_float_rgba_span( GLcontext *ctx,
GLuint n, CONST GLfloat rgbaIn[][4],
GLenum dstFormat, GLenum dstType,
GLvoid *dstAddr,
const struct gl_pixelstore_attrib *dstPacking,
GLuint transferOps )
{
const GLint comps = _mesa_components_in_format(dstFormat);
GLfloat luminance[MAX_WIDTH];
GLfloat (*rgba)[4];
GLuint i;

if (transferOps) {
/* make copy of incoming data */
DEFMARRAY(GLfloat, rgbaCopy, MAX_WIDTH, 4); /* mac 32k limitation */
CHECKARRAY(rgbaCopy, return); /* mac 32k limitation */

for (i = 0; i < n; i++) {
rgbaCopy[i][0] = rgbaIn[i][0];
rgbaCopy[i][1] = rgbaIn[i][1];
rgbaCopy[i][2] = rgbaIn[i][2];
rgbaCopy[i][3] = rgbaIn[i][3];
}

rgba = (GLfloat (*)[4]) rgbaCopy;

/* scale & bias */
if (transferOps & IMAGE_SCALE_BIAS_BIT) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
}
/* color map lookup */
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_rgba( ctx, n, rgba );
}
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->ColorTable, n, rgba);
}
/* convolution */
if (transferOps & IMAGE_CONVOLUTION_BIT) {
/* this has to be done in the calling code */
}
/* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.PostConvolutionScale[RCOMP],
ctx->Pixel.PostConvolutionScale[GCOMP],
ctx->Pixel.PostConvolutionScale[BCOMP],
ctx->Pixel.PostConvolutionScale[ACOMP],
ctx->Pixel.PostConvolutionBias[RCOMP],
ctx->Pixel.PostConvolutionBias[GCOMP],
ctx->Pixel.PostConvolutionBias[BCOMP],
ctx->Pixel.PostConvolutionBias[ACOMP]);
}
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostConvolutionColorTable, n, rgba);
}
/* color matrix transform */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
_mesa_transform_rgba(ctx, n, rgba);
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, n, rgba);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
_mesa_update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
/* min/max here */
if (transferOps & IMAGE_MIN_MAX_BIT) {
_mesa_update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
if (ctx->MinMax.Sink) {
UNDEFARRAY(rgbaCopy); /* mac 32k limitation */
return;
}
}
UNDEFARRAY(rgbaCopy); /* mac 32k limitation */
}
else {
/* use incoming data, not a copy */
rgba = (GLfloat (*)[4]) rgbaIn;
}

/* XXX clamp rgba to [0,1]? */

if (dstFormat == GL_LUMINANCE || dstFormat == GL_LUMINANCE_ALPHA) {
for (i = 0; i < n; i++) {
GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
#if CHAN_TYPE == GL_FLOAT
luminance[i] = sum;
#else
luminance[i] = CLAMP(sum, 0.0F, 1.0F);
#endif
}
}

/*
* Pack/store the pixels. Ugh! Lots of cases!!!
*/
switch (dstType) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UBYTE(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UBYTE(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_UBYTE(luminance[i]);
dst[i*2+1] = FLOAT_TO_UBYTE(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_UBYTE(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_UBYTE(rgba[i][ACOMP]);
}
break;
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UBYTE(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_UBYTE(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_UBYTE(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_UBYTE(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
}
break;
case GL_BYTE:
{
GLbyte *dst = (GLbyte *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_BYTE(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_BYTE(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_BYTE(luminance[i]);
dst[i*2+1] = FLOAT_TO_BYTE(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_BYTE(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_BYTE(rgba[i][ACOMP]);
}
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_BYTE(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_BYTE(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort *dst = (GLushort *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_USHORT(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_USHORT(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_USHORT(luminance[i]);
dst[i*2+1] = FLOAT_TO_USHORT(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_USHORT(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_USHORT(rgba[i][ACOMP]);
}
break;
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_USHORT(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_USHORT(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_USHORT(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_USHORT(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n * comps);
}
}
break;
case GL_SHORT:
{
GLshort *dst = (GLshort *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_SHORT(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_SHORT(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_SHORT(luminance[i]);
dst[i*2+1] = FLOAT_TO_SHORT(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_SHORT(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_SHORT(rgba[i][ACOMP]);
}
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_SHORT(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_SHORT(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_SHORT(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_SHORT(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n * comps );
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint *dst = (GLuint *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UINT(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UINT(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UINT(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UINT(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_UINT(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_UINT(luminance[i]);
dst[i*2+1] = FLOAT_TO_UINT(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_UINT(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_UINT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_UINT(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UINT(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_UINT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_UINT(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_UINT(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_UINT(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_UINT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_UINT(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UINT(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_UINT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_UINT(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_UINT(rgba[i][ACOMP]);
}
break;
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_UINT(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_UINT(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_UINT(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_UINT(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n * comps );
}
}
break;
case GL_INT:
{
GLint *dst = (GLint *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_INT(rgba[i][RCOMP]);
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_INT(rgba[i][GCOMP]);
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_INT(rgba[i][BCOMP]);
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_INT(rgba[i][ACOMP]);
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = FLOAT_TO_INT(luminance[i]);
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = FLOAT_TO_INT(luminance[i]);
dst[i*2+1] = FLOAT_TO_INT(rgba[i][ACOMP]);
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_INT(rgba[i][RCOMP]);
dst[i*3+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_INT(rgba[i][BCOMP]);
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_INT(rgba[i][RCOMP]);
dst[i*4+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_INT(rgba[i][BCOMP]);
dst[i*4+3] = FLOAT_TO_INT(rgba[i][ACOMP]);
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = FLOAT_TO_INT(rgba[i][BCOMP]);
dst[i*3+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
dst[i*3+2] = FLOAT_TO_INT(rgba[i][RCOMP]);
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_INT(rgba[i][BCOMP]);
dst[i*4+1] = FLOAT_TO_INT(rgba[i][GCOMP]);
dst[i*4+2] = FLOAT_TO_INT(rgba[i][RCOMP]);
dst[i*4+3] = FLOAT_TO_INT(rgba[i][ACOMP]);
}
break;
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = FLOAT_TO_INT(rgba[i][ACOMP]);
dst[i*4+1] = FLOAT_TO_INT(rgba[i][BCOMP]);
dst[i*4+2] = FLOAT_TO_INT(rgba[i][GCOMP]);
dst[i*4+3] = FLOAT_TO_INT(rgba[i][RCOMP]);
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n * comps );
}
}
break;
case GL_FLOAT:
{
GLfloat *dst = (GLfloat *) dstAddr;
switch (dstFormat) {
case GL_RED:
for (i=0;i<n;i++)
dst[i] = rgba[i][RCOMP];
break;
case GL_GREEN:
for (i=0;i<n;i++)
dst[i] = rgba[i][GCOMP];
break;
case GL_BLUE:
for (i=0;i<n;i++)
dst[i] = rgba[i][BCOMP];
break;
case GL_ALPHA:
for (i=0;i<n;i++)
dst[i] = rgba[i][ACOMP];
break;
case GL_LUMINANCE:
for (i=0;i<n;i++)
dst[i] = luminance[i];
break;
case GL_LUMINANCE_ALPHA:
for (i=0;i<n;i++) {
dst[i*2+0] = luminance[i];
dst[i*2+1] = rgba[i][ACOMP];
}
break;
case GL_RGB:
for (i=0;i<n;i++) {
dst[i*3+0] = rgba[i][RCOMP];
dst[i*3+1] = rgba[i][GCOMP];
dst[i*3+2] = rgba[i][BCOMP];
}
break;
case GL_RGBA:
for (i=0;i<n;i++) {
dst[i*4+0] = rgba[i][RCOMP];
dst[i*4+1] = rgba[i][GCOMP];
dst[i*4+2] = rgba[i][BCOMP];
dst[i*4+3] = rgba[i][ACOMP];
}
break;
case GL_BGR:
for (i=0;i<n;i++) {
dst[i*3+0] = rgba[i][BCOMP];
dst[i*3+1] = rgba[i][GCOMP];
dst[i*3+2] = rgba[i][RCOMP];
}
break;
case GL_BGRA:
for (i=0;i<n;i++) {
dst[i*4+0] = rgba[i][BCOMP];
dst[i*4+1] = rgba[i][GCOMP];
dst[i*4+2] = rgba[i][RCOMP];
dst[i*4+3] = rgba[i][ACOMP];
}
break;
case GL_ABGR_EXT:
for (i=0;i<n;i++) {
dst[i*4+0] = rgba[i][ACOMP];
dst[i*4+1] = rgba[i][BCOMP];
dst[i*4+2] = rgba[i][GCOMP];
dst[i*4+3] = rgba[i][RCOMP];
}
break;
default:
_mesa_problem(ctx, "bad format in _mesa_pack_rgba_span\n");
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n * comps );
}
}
break;
case GL_UNSIGNED_BYTE_3_3_2:
if (dstFormat == GL_RGB) {
GLubyte *dst = (GLubyte *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 7.0F)) << 5)
| (((GLint) (rgba[i][GCOMP] * 7.0F)) << 2)
| (((GLint) (rgba[i][BCOMP] * 3.0F)) );
}
}
break;
case GL_UNSIGNED_BYTE_2_3_3_REV:
if (dstFormat == GL_RGB) {
GLubyte *dst = (GLubyte *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 7.0F)) )
| (((GLint) (rgba[i][GCOMP] * 7.0F)) << 3)
| (((GLint) (rgba[i][BCOMP] * 3.0F)) << 5);
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5:
if (dstFormat == GL_RGB) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) << 11)
| (((GLint) (rgba[i][GCOMP] * 63.0F)) << 5)
| (((GLint) (rgba[i][BCOMP] * 31.0F)) );
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5_REV:
if (dstFormat == GL_RGB) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) )
| (((GLint) (rgba[i][GCOMP] * 63.0F)) << 5)
| (((GLint) (rgba[i][BCOMP] * 31.0F)) << 11);
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4:
if (dstFormat == GL_RGBA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 15.0F)) << 12)
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][BCOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][ACOMP] * 15.0F)) );
}
}
else if (dstFormat == GL_BGRA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][BCOMP] * 15.0F)) << 12)
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][RCOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][ACOMP] * 15.0F)) );
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][ACOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][BCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 12)
| (((GLint) (rgba[i][RCOMP] * 15.0F)) );
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
if (dstFormat == GL_RGBA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 15.0F)) )
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][BCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][ACOMP] * 15.0F)) << 12);
}
}
else if (dstFormat == GL_BGRA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][BCOMP] * 15.0F)) )
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][RCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][ACOMP] * 15.0F)) << 12);
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][ACOMP] * 15.0F)) )
| (((GLint) (rgba[i][BCOMP] * 15.0F)) << 4)
| (((GLint) (rgba[i][GCOMP] * 15.0F)) << 8)
| (((GLint) (rgba[i][RCOMP] * 15.0F)) << 12);
}
}
break;
case GL_UNSIGNED_SHORT_5_5_5_1:
if (dstFormat == GL_RGBA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) << 11)
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 6)
| (((GLint) (rgba[i][BCOMP] * 31.0F)) << 1)
| (((GLint) (rgba[i][ACOMP] * 1.0F)) );
}
}
else if (dstFormat == GL_BGRA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][BCOMP] * 31.0F)) << 11)
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 6)
| (((GLint) (rgba[i][RCOMP] * 31.0F)) << 1)
| (((GLint) (rgba[i][ACOMP] * 1.0F)) );
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][ACOMP] * 31.0F)) << 11)
| (((GLint) (rgba[i][BCOMP] * 31.0F)) << 6)
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 1)
| (((GLint) (rgba[i][RCOMP] * 1.0F)) );
}
}
break;
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
if (dstFormat == GL_RGBA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][RCOMP] * 31.0F)) )
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 5)
| (((GLint) (rgba[i][BCOMP] * 31.0F)) << 10)
| (((GLint) (rgba[i][ACOMP] * 1.0F)) << 15);
}
}
else if (dstFormat == GL_BGRA) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][BCOMP] * 31.0F)) )
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 5)
| (((GLint) (rgba[i][RCOMP] * 31.0F)) << 10)
| (((GLint) (rgba[i][ACOMP] * 1.0F)) << 15);
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLushort *dst = (GLushort *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLint) (rgba[i][ACOMP] * 31.0F)) )
| (((GLint) (rgba[i][BCOMP] * 31.0F)) << 5)
| (((GLint) (rgba[i][GCOMP] * 31.0F)) << 10)
| (((GLint) (rgba[i][RCOMP] * 1.0F)) << 15);
}
}
break;
case GL_UNSIGNED_INT_8_8_8_8:
if (dstFormat == GL_RGBA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][RCOMP] * 255.0F)) << 24)
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][BCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][ACOMP] * 255.0F)) );
}
}
else if (dstFormat == GL_BGRA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][BCOMP] * 255.0F)) << 24)
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][RCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][ACOMP] * 255.0F)) );
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][ACOMP] * 255.0F)) << 24)
| (((GLuint) (rgba[i][BCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][RCOMP] * 255.0F)) );
}
}
break;
case GL_UNSIGNED_INT_8_8_8_8_REV:
if (dstFormat == GL_RGBA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][RCOMP] * 255.0F)) )
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][BCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][ACOMP] * 255.0F)) << 24);
}
}
else if (dstFormat == GL_BGRA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][BCOMP] * 255.0F)) )
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][RCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][ACOMP] * 255.0F)) << 24);
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][ACOMP] * 255.0F)) )
| (((GLuint) (rgba[i][BCOMP] * 255.0F)) << 8)
| (((GLuint) (rgba[i][GCOMP] * 255.0F)) << 16)
| (((GLuint) (rgba[i][RCOMP] * 255.0F)) << 24);
}
}
break;
case GL_UNSIGNED_INT_10_10_10_2:
if (dstFormat == GL_RGBA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][RCOMP] * 1023.0F)) << 22)
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 12)
| (((GLuint) (rgba[i][BCOMP] * 1023.0F)) << 2)
| (((GLuint) (rgba[i][ACOMP] * 3.0F)) );
}
}
else if (dstFormat == GL_BGRA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][BCOMP] * 1023.0F)) << 22)
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 12)
| (((GLuint) (rgba[i][RCOMP] * 1023.0F)) << 2)
| (((GLuint) (rgba[i][ACOMP] * 3.0F)) );
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][ACOMP] * 1023.0F)) << 22)
| (((GLuint) (rgba[i][BCOMP] * 1023.0F)) << 12)
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 2)
| (((GLuint) (rgba[i][RCOMP] * 3.0F)) );
}
}
break;
case GL_UNSIGNED_INT_2_10_10_10_REV:
if (dstFormat == GL_RGBA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][RCOMP] * 1023.0F)) )
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 10)
| (((GLuint) (rgba[i][BCOMP] * 1023.0F)) << 20)
| (((GLuint) (rgba[i][ACOMP] * 3.0F)) << 30);
}
}
else if (dstFormat == GL_BGRA) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][BCOMP] * 1023.0F)) )
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 10)
| (((GLuint) (rgba[i][RCOMP] * 1023.0F)) << 20)
| (((GLuint) (rgba[i][ACOMP] * 3.0F)) << 30);
}
}
else if (dstFormat == GL_ABGR_EXT) {
GLuint *dst = (GLuint *) dstAddr;
for (i=0;i<n;i++) {
dst[i] = (((GLuint) (rgba[i][ACOMP] * 1023.0F)) )
| (((GLuint) (rgba[i][BCOMP] * 1023.0F)) << 10)
| (((GLuint) (rgba[i][GCOMP] * 1023.0F)) << 20)
| (((GLuint) (rgba[i][RCOMP] * 3.0F)) << 30);
}
}
break;
default:
_mesa_problem(ctx, "bad type in _mesa_pack_float_rgba_span");
}
}

/*
* Pack the given RGBA span into client memory at 'dest' address
* in the given pixel format and type.
* Optionally apply the enabled pixel transfer ops.
* Pack into memory using the given packing params struct.
* This is used by glReadPixels and glGetTexImage?D()
* Input: ctx - the context
* n - number of pixels in the span
* rgba - the pixels
* format - dest packing format
* type - dest packing datatype
* destination - destination packing address
* packing - pixel packing parameters
* transferOps - bitmask of IMAGE_*_BIT operations to apply
*/
void
_mesa_pack_rgba_span( GLcontext *ctx,
GLuint n, CONST GLchan srcRgba[][4],
GLenum dstFormat, GLenum dstType,
GLvoid *dstAddr,
const struct gl_pixelstore_attrib *dstPacking,
GLuint transferOps)
{
ASSERT((ctx->NewState & _NEW_PIXEL) == 0 || transferOps == 0);

/* Test for optimized case first */
if (transferOps == 0 && dstFormat == GL_RGBA && dstType == CHAN_TYPE) {
/* common simple case */
MEMCPY(dstAddr, srcRgba, n * 4 * sizeof(GLchan));
}
else if (transferOps == 0 && dstFormat == GL_RGB && dstType == CHAN_TYPE) {
/* common simple case */
GLuint i;
GLchan *dest = (GLchan *) dstAddr;
for (i = 0; i < n; i++) {
dest[0] = srcRgba[i][RCOMP];
dest[1] = srcRgba[i][GCOMP];
dest[2] = srcRgba[i][BCOMP];
dest += 3;
}
}
else if (transferOps == 0 && dstFormat == GL_RGBA && dstType == GL_UNSIGNED_BYTE) {
/* common simple case */
GLuint i;
GLubyte *dest = (GLubyte *) dstAddr;
for (i = 0; i < n; i++) {
dest[0] = CHAN_TO_UBYTE(srcRgba[i][RCOMP]);
dest[1] = CHAN_TO_UBYTE(srcRgba[i][GCOMP]);
dest[2] = CHAN_TO_UBYTE(srcRgba[i][BCOMP]);
dest[3] = CHAN_TO_UBYTE(srcRgba[i][ACOMP]);
dest += 4;
}
}
else {
/* general solution */
GLuint i;
DEFMARRAY(GLfloat, rgba, MAX_WIDTH, 4); /* mac 32k limitation */
CHECKARRAY(rgba, return); /* mac 32k limitation */

assert(n <= MAX_WIDTH);
/* convert color components to floating point */
for (i=0;i<n;i++) {
rgba[i][RCOMP] = CHAN_TO_FLOAT(srcRgba[i][RCOMP]);
rgba[i][GCOMP] = CHAN_TO_FLOAT(srcRgba[i][GCOMP]);
rgba[i][BCOMP] = CHAN_TO_FLOAT(srcRgba[i][BCOMP]);
rgba[i][ACOMP] = CHAN_TO_FLOAT(srcRgba[i][ACOMP]);
}
_mesa_pack_float_rgba_span(ctx, n, (const GLfloat (*)[4]) rgba,
dstFormat, dstType, dstAddr,
dstPacking, transferOps);
UNDEFARRAY(rgba); /* mac 32k limitation */
}
}

#define SWAP2BYTE(VALUE) \
{ \
GLubyte *bytes = (GLubyte *) &(VALUE); \
GLubyte tmp = bytes[0]; \
bytes[0] = bytes[1]; \
bytes[1] = tmp; \
}

#define SWAP4BYTE(VALUE) \
{ \
GLubyte *bytes = (GLubyte *) &(VALUE); \
GLubyte tmp = bytes[0]; \
bytes[0] = bytes[3]; \
bytes[3] = tmp; \
tmp = bytes[1]; \
bytes[1] = bytes[2]; \
bytes[2] = tmp; \
}

static void
extract_uint_indexes(GLuint n, GLuint indexes[],
GLenum srcFormat, GLenum srcType, const GLvoid *src,
const struct gl_pixelstore_attrib *unpack )
{
assert(srcFormat == GL_COLOR_INDEX);

ASSERT(srcType == GL_BITMAP ||
srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT);

switch (srcType) {
case GL_BITMAP:
{
GLubyte *ubsrc = (GLubyte *) src;
if (unpack->LsbFirst) {
GLubyte mask = 1 << (unpack->SkipPixels & 0x7);
GLuint i;
for (i = 0; i < n; i++) {
indexes[i] = (*ubsrc & mask) ? 1 : 0;
if (mask == 128) {
mask = 1;
ubsrc++;
}
else {
mask = mask << 1;
}
}
}
else {
GLubyte mask = 128 >> (unpack->SkipPixels & 0x7);
GLuint i;
for (i = 0; i < n; i++) {
indexes[i] = (*ubsrc & mask) ? 1 : 0;
if (mask == 1) {
mask = 128;
ubsrc++;
}
else {
mask = mask >> 1;
}
}
}
}
break;
case GL_UNSIGNED_BYTE:
{
GLuint i;
const GLubyte *s = (const GLubyte *) src;
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
break;
case GL_BYTE:
{
GLuint i;
const GLbyte *s = (const GLbyte *) src;
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
break;
case GL_UNSIGNED_SHORT:
{
GLuint i;
const GLushort *s = (const GLushort *) src;
if (unpack->SwapBytes) {
for (i = 0; i < n; i++) {
GLushort value = s[i];
SWAP2BYTE(value);
indexes[i] = value;
}
}
else {
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
}
break;
case GL_SHORT:
{
GLuint i;
const GLshort *s = (const GLshort *) src;
if (unpack->SwapBytes) {
for (i = 0; i < n; i++) {
GLshort value = s[i];
SWAP2BYTE(value);
indexes[i] = value;
}
}
else {
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint i;
const GLuint *s = (const GLuint *) src;
if (unpack->SwapBytes) {
for (i = 0; i < n; i++) {
GLuint value = s[i];
SWAP4BYTE(value);
indexes[i] = value;
}
}
else {
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
}
break;
case GL_INT:
{
GLuint i;
const GLint *s = (const GLint *) src;
if (unpack->SwapBytes) {
for (i = 0; i < n; i++) {
GLint value = s[i];
SWAP4BYTE(value);
indexes[i] = value;
}
}
else {
for (i = 0; i < n; i++)
indexes[i] = s[i];
}
}
break;
case GL_FLOAT:
{
GLuint i;
const GLfloat *s = (const GLfloat *) src;
if (unpack->SwapBytes) {
for (i = 0; i < n; i++) {
GLfloat value = s[i];
SWAP4BYTE(value);
indexes[i] = (GLuint) value;
}
}
else {
for (i = 0; i < n; i++)
indexes[i] = (GLuint) s[i];
}
}
break;
default:
_mesa_problem(NULL, "bad srcType in extract_uint_indexes");
return;
}
}

/*
* This function extracts floating point RGBA values from arbitrary
* image data. srcFormat and srcType are the format and type parameters
* passed to glDrawPixels, glTexImage[123]D, glTexSubImage[123]D, etc.
*
* Refering to section 3.6.4 of the OpenGL 1.2 spec, this function
* implements the "Conversion to floating point", "Conversion to RGB",
* and "Final Expansion to RGBA" operations.
*
* Args: n - number of pixels
* rgba - output colors
* srcFormat - format of incoming data
* srcType - datatype of incoming data
* src - source data pointer
* swapBytes - perform byteswapping of incoming data?
*/
static void
extract_float_rgba(GLuint n, GLfloat rgba[][4],
GLenum srcFormat, GLenum srcType, const GLvoid *src,
GLboolean swapBytes)
{
GLint redIndex, greenIndex, blueIndex, alphaIndex;
GLint stride;
GLint rComp, bComp, gComp, aComp;

ASSERT(srcFormat == GL_RED ||
srcFormat == GL_GREEN ||
srcFormat == GL_BLUE ||
srcFormat == GL_ALPHA ||
srcFormat == GL_LUMINANCE ||
srcFormat == GL_LUMINANCE_ALPHA ||
srcFormat == GL_INTENSITY ||
srcFormat == GL_RGB ||
srcFormat == GL_BGR ||
srcFormat == GL_RGBA ||
srcFormat == GL_BGRA ||
srcFormat == GL_ABGR_EXT);

ASSERT(srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT ||
srcType == GL_UNSIGNED_BYTE_3_3_2 ||
srcType == GL_UNSIGNED_BYTE_2_3_3_REV ||
srcType == GL_UNSIGNED_SHORT_5_6_5 ||
srcType == GL_UNSIGNED_SHORT_5_6_5_REV ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4 ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
srcType == GL_UNSIGNED_SHORT_5_5_5_1 ||
srcType == GL_UNSIGNED_SHORT_1_5_5_5_REV ||
srcType == GL_UNSIGNED_INT_8_8_8_8 ||
srcType == GL_UNSIGNED_INT_8_8_8_8_REV ||
srcType == GL_UNSIGNED_INT_10_10_10_2 ||
srcType == GL_UNSIGNED_INT_2_10_10_10_REV);

rComp = gComp = bComp = aComp = -1;

switch (srcFormat) {
case GL_RED:
redIndex = 0;
greenIndex = blueIndex = alphaIndex = -1;
stride = 1;
break;
case GL_GREEN:
greenIndex = 0;
redIndex = blueIndex = alphaIndex = -1;
stride = 1;
break;
case GL_BLUE:
blueIndex = 0;
redIndex = greenIndex = alphaIndex = -1;
stride = 1;
break;
case GL_ALPHA:
redIndex = greenIndex = blueIndex = -1;
alphaIndex = 0;
stride = 1;
break;
case GL_LUMINANCE:
redIndex = greenIndex = blueIndex = 0;
alphaIndex = -1;
stride = 1;
break;
case GL_LUMINANCE_ALPHA:
redIndex = greenIndex = blueIndex = 0;
alphaIndex = 1;
stride = 2;
break;
case GL_INTENSITY:
redIndex = greenIndex = blueIndex = alphaIndex = 0;
stride = 1;
break;
case GL_RGB:
redIndex = 0;
greenIndex = 1;
blueIndex = 2;
alphaIndex = -1;
stride = 3;
break;
case GL_BGR:
redIndex = 2;
greenIndex = 1;
blueIndex = 0;
alphaIndex = -1;
stride = 3;
break;
case GL_RGBA:
redIndex = 0;
greenIndex = 1;
blueIndex = 2;
alphaIndex = 3;
rComp = 0;
gComp = 1;
bComp = 2;
aComp = 3;
stride = 4;
break;
case GL_BGRA:
redIndex = 2;
greenIndex = 1;
blueIndex = 0;
alphaIndex = 3;
rComp = 2;
gComp = 1;
bComp = 0;
aComp = 3;
stride = 4;
break;
case GL_ABGR_EXT:
redIndex = 3;
greenIndex = 2;
blueIndex = 1;
alphaIndex = 0;
rComp = 3;
gComp = 2;
bComp = 1;
aComp = 0;
stride = 4;
break;
default:
_mesa_problem(NULL, "bad srcFormat in extract float data");
return;
}

#define PROCESS(INDEX, CHANNEL, DEFAULT, TYPE, CONVERSION) \
if ((INDEX) < 0) { \
GLuint i; \
for (i = 0; i < n; i++) { \
rgba[i][CHANNEL] = DEFAULT; \
} \
} \
else if (swapBytes) { \
const TYPE *s = (const TYPE *) src; \
GLuint i; \
for (i = 0; i < n; i++) { \
TYPE value = s[INDEX]; \
if (sizeof(TYPE) == 2) { \
SWAP2BYTE(value); \
} \
else if (sizeof(TYPE) == 4) { \
SWAP4BYTE(value); \
} \
rgba[i][CHANNEL] = (GLfloat) CONVERSION(value); \
s += stride; \
} \
} \
else { \
const TYPE *s = (const TYPE *) src; \
GLuint i; \
for (i = 0; i < n; i++) { \
rgba[i][CHANNEL] = (GLfloat) CONVERSION(s[INDEX]); \
s += stride; \
} \
}

switch (srcType) {
case GL_UNSIGNED_BYTE:
PROCESS(redIndex, RCOMP, 0.0F, GLubyte, UBYTE_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLubyte, UBYTE_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLubyte, UBYTE_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLubyte, UBYTE_TO_FLOAT);
break;
case GL_BYTE:
PROCESS(redIndex, RCOMP, 0.0F, GLbyte, BYTE_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLbyte, BYTE_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLbyte, BYTE_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLbyte, BYTE_TO_FLOAT);
break;
case GL_UNSIGNED_SHORT:
PROCESS(redIndex, RCOMP, 0.0F, GLushort, USHORT_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLushort, USHORT_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLushort, USHORT_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLushort, USHORT_TO_FLOAT);
break;
case GL_SHORT:
PROCESS(redIndex, RCOMP, 0.0F, GLshort, SHORT_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLshort, SHORT_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLshort, SHORT_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLshort, SHORT_TO_FLOAT);
break;
case GL_UNSIGNED_INT:
PROCESS(redIndex, RCOMP, 0.0F, GLuint, UINT_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLuint, UINT_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLuint, UINT_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLuint, UINT_TO_FLOAT);
break;
case GL_INT:
PROCESS(redIndex, RCOMP, 0.0F, GLint, INT_TO_FLOAT);
PROCESS(greenIndex, GCOMP, 0.0F, GLint, INT_TO_FLOAT);
PROCESS(blueIndex, BCOMP, 0.0F, GLint, INT_TO_FLOAT);
PROCESS(alphaIndex, ACOMP, 1.0F, GLint, INT_TO_FLOAT);
break;
case GL_FLOAT:
PROCESS(redIndex, RCOMP, 0.0F, GLfloat, (GLfloat));
PROCESS(greenIndex, GCOMP, 0.0F, GLfloat, (GLfloat));
PROCESS(blueIndex, BCOMP, 0.0F, GLfloat, (GLfloat));
PROCESS(alphaIndex, ACOMP, 1.0F, GLfloat, (GLfloat));
break;
case GL_UNSIGNED_BYTE_3_3_2:
{
const GLubyte *ubsrc = (const GLubyte *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLubyte p = ubsrc[i];
rgba[i][RCOMP] = ((p >> 5) ) * (1.0F / 7.0F);
rgba[i][GCOMP] = ((p >> 2) & 0x7) * (1.0F / 7.0F);
rgba[i][BCOMP] = ((p ) & 0x3) * (1.0F / 3.0F);
rgba[i][ACOMP] = 1.0F;
}
}
break;
case GL_UNSIGNED_BYTE_2_3_3_REV:
{
const GLubyte *ubsrc = (const GLubyte *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLubyte p = ubsrc[i];
rgba[i][RCOMP] = ((p ) & 0x7) * (1.0F / 7.0F);
rgba[i][GCOMP] = ((p >> 3) & 0x7) * (1.0F / 7.0F);
rgba[i][BCOMP] = ((p >> 6) ) * (1.0F / 3.0F);
rgba[i][ACOMP] = 1.0F;
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][RCOMP] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][GCOMP] = ((p >> 5) & 0x3f) * (1.0F / 63.0F);
rgba[i][BCOMP] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][ACOMP] = 1.0F;
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][RCOMP] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][GCOMP] = ((p >> 5) & 0x3f) * (1.0F / 63.0F);
rgba[i][BCOMP] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][ACOMP] = 1.0F;
}
}
break;
case GL_UNSIGNED_SHORT_5_6_5_REV:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][RCOMP] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][GCOMP] = ((p >> 5) & 0x3f) * (1.0F / 63.0F);
rgba[i][BCOMP] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][ACOMP] = 1.0F;
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][RCOMP] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][GCOMP] = ((p >> 5) & 0x3f) * (1.0F / 63.0F);
rgba[i][BCOMP] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][ACOMP] = 1.0F;
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][rComp] = ((p >> 12) ) * (1.0F / 15.0F);
rgba[i][gComp] = ((p >> 8) & 0xf) * (1.0F / 15.0F);
rgba[i][bComp] = ((p >> 4) & 0xf) * (1.0F / 15.0F);
rgba[i][aComp] = ((p ) & 0xf) * (1.0F / 15.0F);
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][rComp] = ((p >> 12) ) * (1.0F / 15.0F);
rgba[i][gComp] = ((p >> 8) & 0xf) * (1.0F / 15.0F);
rgba[i][bComp] = ((p >> 4) & 0xf) * (1.0F / 15.0F);
rgba[i][aComp] = ((p ) & 0xf) * (1.0F / 15.0F);
}
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][rComp] = ((p ) & 0xf) * (1.0F / 15.0F);
rgba[i][gComp] = ((p >> 4) & 0xf) * (1.0F / 15.0F);
rgba[i][bComp] = ((p >> 8) & 0xf) * (1.0F / 15.0F);
rgba[i][aComp] = ((p >> 12) ) * (1.0F / 15.0F);
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][rComp] = ((p ) & 0xf) * (1.0F / 15.0F);
rgba[i][gComp] = ((p >> 4) & 0xf) * (1.0F / 15.0F);
rgba[i][bComp] = ((p >> 8) & 0xf) * (1.0F / 15.0F);
rgba[i][aComp] = ((p >> 12) ) * (1.0F / 15.0F);
}
}
break;
case GL_UNSIGNED_SHORT_5_5_5_1:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][rComp] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][gComp] = ((p >> 6) & 0x1f) * (1.0F / 31.0F);
rgba[i][bComp] = ((p >> 1) & 0x1f) * (1.0F / 31.0F);
rgba[i][aComp] = ((p ) & 0x1) * (1.0F / 1.0F);
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][rComp] = ((p >> 11) ) * (1.0F / 31.0F);
rgba[i][gComp] = ((p >> 6) & 0x1f) * (1.0F / 31.0F);
rgba[i][bComp] = ((p >> 1) & 0x1f) * (1.0F / 31.0F);
rgba[i][aComp] = ((p ) & 0x1) * (1.0F / 1.0F);
}
}
break;
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
if (swapBytes) {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
SWAP2BYTE(p);
rgba[i][rComp] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][gComp] = ((p >> 5) & 0x1f) * (1.0F / 31.0F);
rgba[i][bComp] = ((p >> 10) & 0x1f) * (1.0F / 31.0F);
rgba[i][aComp] = ((p >> 15) ) * (1.0F / 1.0F);
}
}
else {
const GLushort *ussrc = (const GLushort *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLushort p = ussrc[i];
rgba[i][rComp] = ((p ) & 0x1f) * (1.0F / 31.0F);
rgba[i][gComp] = ((p >> 5) & 0x1f) * (1.0F / 31.0F);
rgba[i][bComp] = ((p >> 10) & 0x1f) * (1.0F / 31.0F);
rgba[i][aComp] = ((p >> 15) ) * (1.0F / 1.0F);
}
}
break;
case GL_UNSIGNED_INT_8_8_8_8:
if (swapBytes) {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = UBYTE_TO_FLOAT((p ) & 0xff);
rgba[i][gComp] = UBYTE_TO_FLOAT((p >> 8) & 0xff);
rgba[i][bComp] = UBYTE_TO_FLOAT((p >> 16) & 0xff);
rgba[i][aComp] = UBYTE_TO_FLOAT((p >> 24) );
}
}
else {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = UBYTE_TO_FLOAT((p >> 24) );
rgba[i][gComp] = UBYTE_TO_FLOAT((p >> 16) & 0xff);
rgba[i][bComp] = UBYTE_TO_FLOAT((p >> 8) & 0xff);
rgba[i][aComp] = UBYTE_TO_FLOAT((p ) & 0xff);
}
}
break;
case GL_UNSIGNED_INT_8_8_8_8_REV:
if (swapBytes) {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = UBYTE_TO_FLOAT((p >> 24) );
rgba[i][gComp] = UBYTE_TO_FLOAT((p >> 16) & 0xff);
rgba[i][bComp] = UBYTE_TO_FLOAT((p >> 8) & 0xff);
rgba[i][aComp] = UBYTE_TO_FLOAT((p ) & 0xff);
}
}
else {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = UBYTE_TO_FLOAT((p ) & 0xff);
rgba[i][gComp] = UBYTE_TO_FLOAT((p >> 8) & 0xff);
rgba[i][bComp] = UBYTE_TO_FLOAT((p >> 16) & 0xff);
rgba[i][aComp] = UBYTE_TO_FLOAT((p >> 24) );
}
}
break;
case GL_UNSIGNED_INT_10_10_10_2:
if (swapBytes) {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
SWAP4BYTE(p);
rgba[i][rComp] = ((p >> 22) ) * (1.0F / 1023.0F);
rgba[i][gComp] = ((p >> 12) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][bComp] = ((p >> 2) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][aComp] = ((p ) & 0x3 ) * (1.0F / 3.0F);
}
}
else {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = ((p >> 22) ) * (1.0F / 1023.0F);
rgba[i][gComp] = ((p >> 12) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][bComp] = ((p >> 2) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][aComp] = ((p ) & 0x3 ) * (1.0F / 3.0F);
}
}
break;
case GL_UNSIGNED_INT_2_10_10_10_REV:
if (swapBytes) {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
SWAP4BYTE(p);
rgba[i][rComp] = ((p ) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][gComp] = ((p >> 10) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][bComp] = ((p >> 20) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][aComp] = ((p >> 30) ) * (1.0F / 3.0F);
}
}
else {
const GLuint *uisrc = (const GLuint *) src;
GLuint i;
for (i = 0; i < n; i ++) {
GLuint p = uisrc[i];
rgba[i][rComp] = ((p ) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][gComp] = ((p >> 10) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][bComp] = ((p >> 20) & 0x3ff) * (1.0F / 1023.0F);
rgba[i][aComp] = ((p >> 30) ) * (1.0F / 3.0F);
}
}
break;
default:
_mesa_problem(NULL, "bad srcType in extract float data");
break;
}
}

/*
* Unpack a row of color image data from a client buffer according to
* the pixel unpacking parameters.
* Return GLubyte values in the specified dest image format.
* This is (or will be) used by glDrawPixels and glTexImage?D().
* Input: ctx - the context
* n - number of pixels in the span
* dstFormat - format of destination color array
* dest - the destination color array
* srcFormat - source image format
* srcType - source image datatype
* source - source image pointer
* srcPacking - pixel unpacking parameters
* transferOps - bitmask of IMAGE_*_BIT values of operations to apply
*
* XXX perhaps expand this to process whole images someday.
*/
void
_mesa_unpack_chan_color_span( GLcontext *ctx,
GLuint n, GLenum dstFormat, GLchan dest[],
GLenum srcFormat, GLenum srcType,
const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking,
GLuint transferOps )
{
ASSERT(dstFormat == GL_ALPHA ||
dstFormat == GL_LUMINANCE ||
dstFormat == GL_LUMINANCE_ALPHA ||
dstFormat == GL_INTENSITY ||
dstFormat == GL_RGB ||
dstFormat == GL_RGBA ||
dstFormat == GL_COLOR_INDEX);

ASSERT(srcFormat == GL_RED ||
srcFormat == GL_GREEN ||
srcFormat == GL_BLUE ||
srcFormat == GL_ALPHA ||
srcFormat == GL_LUMINANCE ||
srcFormat == GL_LUMINANCE_ALPHA ||
srcFormat == GL_INTENSITY ||
srcFormat == GL_RGB ||
srcFormat == GL_BGR ||
srcFormat == GL_RGBA ||
srcFormat == GL_BGRA ||
srcFormat == GL_ABGR_EXT ||
srcFormat == GL_COLOR_INDEX);

ASSERT(srcType == GL_BITMAP ||
srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT ||
srcType == GL_UNSIGNED_BYTE_3_3_2 ||
srcType == GL_UNSIGNED_BYTE_2_3_3_REV ||
srcType == GL_UNSIGNED_SHORT_5_6_5 ||
srcType == GL_UNSIGNED_SHORT_5_6_5_REV ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4 ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
srcType == GL_UNSIGNED_SHORT_5_5_5_1 ||
srcType == GL_UNSIGNED_SHORT_1_5_5_5_REV ||
srcType == GL_UNSIGNED_INT_8_8_8_8 ||
srcType == GL_UNSIGNED_INT_8_8_8_8_REV ||
srcType == GL_UNSIGNED_INT_10_10_10_2 ||
srcType == GL_UNSIGNED_INT_2_10_10_10_REV);

/* Try simple cases first */
if (transferOps == 0 ){
if (srcType == CHAN_TYPE) {
if (dstFormat == GL_RGBA) {
if (srcFormat == GL_RGBA) {
MEMCPY( dest, source, n * 4 * sizeof(GLchan) );
return;
}
else if (srcFormat == GL_RGB) {
GLuint i;
const GLchan *src = (const GLchan *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = CHAN_MAX;
src += 3;
dst += 4;
}
return;
}
}
else if (dstFormat == GL_RGB) {
if (srcFormat == GL_RGB) {
MEMCPY( dest, source, n * 3 * sizeof(GLchan) );
return;
}
else if (srcFormat == GL_RGBA) {
GLuint i;
const GLchan *src = (const GLchan *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
src += 4;
dst += 3;
}
return;
}
}
else if (dstFormat == srcFormat) {
GLint comps = _mesa_components_in_format(srcFormat);
assert(comps > 0);
MEMCPY( dest, source, n * comps * sizeof(GLchan) );
return;
}
}
/*
* Common situation, loading 8bit RGBA/RGB source images
* into 16/32 bit destination. (OSMesa16/32)
*/
else if (srcType == GL_UNSIGNED_BYTE) {
if (dstFormat == GL_RGBA) {
if (srcFormat == GL_RGB) {
GLuint i;
const GLubyte *src = (const GLubyte *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = UBYTE_TO_CHAN(src[0]);
dst[1] = UBYTE_TO_CHAN(src[1]);
dst[2] = UBYTE_TO_CHAN(src[2]);
dst[3] = CHAN_MAX;
src += 3;
dst += 4;
}
return;
}
else if (srcFormat == GL_RGBA) {
GLuint i;
const GLubyte *src = (const GLubyte *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = UBYTE_TO_CHAN(src[0]);
dst[1] = UBYTE_TO_CHAN(src[1]);
dst[2] = UBYTE_TO_CHAN(src[2]);
dst[3] = UBYTE_TO_CHAN(src[3]);
src += 4;
dst += 4;
}
return;
}
}
else if (dstFormat == GL_RGB) {
if (srcFormat == GL_RGB) {
GLuint i;
const GLubyte *src = (const GLubyte *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = UBYTE_TO_CHAN(src[0]);
dst[1] = UBYTE_TO_CHAN(src[1]);
dst[2] = UBYTE_TO_CHAN(src[2]);
src += 3;
dst += 3;
}
return;
}
else if (srcFormat == GL_RGBA) {
GLuint i;
const GLubyte *src = (const GLubyte *) source;
GLchan *dst = dest;
for (i = 0; i < n; i++) {
dst[0] = UBYTE_TO_CHAN(src[0]);
dst[1] = UBYTE_TO_CHAN(src[1]);
dst[2] = UBYTE_TO_CHAN(src[2]);
src += 4;
dst += 3;
}
return;
}
}
}
}

/* general solution begins here */
{
GLint dstComponents;
GLint dstRedIndex, dstGreenIndex, dstBlueIndex, dstAlphaIndex;
GLint dstLuminanceIndex, dstIntensityIndex;
DEFMARRAY(GLfloat, rgba, MAX_WIDTH, 4); /* mac 32k limitation */
CHECKARRAY(rgba, return); /* mac 32k limitation */

dstComponents = _mesa_components_in_format( dstFormat );
/* source & dest image formats should have been error checked by now */
assert(dstComponents > 0);

/*
* Extract image data and convert to RGBA floats
*/
assert(n <= MAX_WIDTH);
if (srcFormat == GL_COLOR_INDEX) {
GLuint indexes[MAX_WIDTH];
extract_uint_indexes(n, indexes, srcFormat, srcType, source,
srcPacking);

if (dstFormat == GL_COLOR_INDEX
&& (transferOps & IMAGE_MAP_COLOR_BIT)) {
_mesa_map_ci(ctx, n, indexes);
}
if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
_mesa_shift_and_offset_ci(ctx, n, indexes);
}

if (dstFormat == GL_COLOR_INDEX) {
/* convert to GLchan and return */
GLuint i;
for (i = 0; i < n; i++) {
dest[i] = (GLchan) (indexes[i] & 0xff);
}
UNDEFARRAY(rgba); /* mac 32k limitation */
return;
}
else {
/* Convert indexes to RGBA */
_mesa_map_ci_to_rgba(ctx, n, indexes, rgba);
}
}
else {
extract_float_rgba(n, rgba, srcFormat, srcType, source,
srcPacking->SwapBytes);

/* scale and bias colors */
if (transferOps & IMAGE_SCALE_BIAS_BIT) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
}
/* color map lookup */
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_rgba(ctx, n, rgba);
}
}

if (transferOps) {
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->ColorTable, n, rgba);
}
/* convolution */
if (transferOps & IMAGE_CONVOLUTION_BIT) {
/* this has to be done in the calling code */
}
/* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.PostConvolutionScale[RCOMP],
ctx->Pixel.PostConvolutionScale[GCOMP],
ctx->Pixel.PostConvolutionScale[BCOMP],
ctx->Pixel.PostConvolutionScale[ACOMP],
ctx->Pixel.PostConvolutionBias[RCOMP],
ctx->Pixel.PostConvolutionBias[GCOMP],
ctx->Pixel.PostConvolutionBias[BCOMP],
ctx->Pixel.PostConvolutionBias[ACOMP]);
}
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostConvolutionColorTable, n, rgba);
}
/* color matrix transform */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
_mesa_transform_rgba(ctx, n, rgba);
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, n, rgba);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
_mesa_update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
/* min/max here */
if (transferOps & IMAGE_MIN_MAX_BIT) {
_mesa_update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
}

/* clamp to [0,1] */
#if CHAN_TYPE != GL_FLOAT
{
GLuint i;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
}
}
#endif

/* Now determine which color channels we need to produce.
* And determine the dest index (offset) within each color tuple.
*/
switch (dstFormat) {
case GL_ALPHA:
dstAlphaIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = -1;
dstLuminanceIndex = dstIntensityIndex = -1;
break;
case GL_LUMINANCE:
dstLuminanceIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = dstAlphaIndex = -1;
dstIntensityIndex = -1;
break;
case GL_LUMINANCE_ALPHA:
dstLuminanceIndex = 0;
dstAlphaIndex = 1;
dstRedIndex = dstGreenIndex = dstBlueIndex = -1;
dstIntensityIndex = -1;
break;
case GL_INTENSITY:
dstIntensityIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = dstAlphaIndex = -1;
dstLuminanceIndex = -1;
break;
case GL_RGB:
dstRedIndex = 0;
dstGreenIndex = 1;
dstBlueIndex = 2;
dstAlphaIndex = dstLuminanceIndex = dstIntensityIndex = -1;
break;
case GL_RGBA:
dstRedIndex = 0;
dstGreenIndex = 1;
dstBlueIndex = 2;
dstAlphaIndex = 3;
dstLuminanceIndex = dstIntensityIndex = -1;
break;
default:
_mesa_problem(ctx, "bad dstFormat in _mesa_unpack_chan_span()");
UNDEFARRAY(rgba); /* mac 32k limitation */
return;
}

/* Now return the GLchan data in the requested dstFormat */

if (dstRedIndex >= 0) {
GLchan *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
CLAMPED_FLOAT_TO_CHAN(dst[dstRedIndex], rgba[i][RCOMP]);
dst += dstComponents;
}
}

if (dstGreenIndex >= 0) {
GLchan *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
CLAMPED_FLOAT_TO_CHAN(dst[dstGreenIndex], rgba[i][GCOMP]);
dst += dstComponents;
}
}

if (dstBlueIndex >= 0) {
GLchan *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
CLAMPED_FLOAT_TO_CHAN(dst[dstBlueIndex], rgba[i][BCOMP]);
dst += dstComponents;
}
}

if (dstAlphaIndex >= 0) {
GLchan *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
CLAMPED_FLOAT_TO_CHAN(dst[dstAlphaIndex], rgba[i][ACOMP]);
dst += dstComponents;
}
}

if (dstIntensityIndex >= 0) {
GLchan *dst = dest;
GLuint i;
assert(dstIntensityIndex == 0);
assert(dstComponents == 1);
for (i = 0; i < n; i++) {
/* Intensity comes from red channel */
CLAMPED_FLOAT_TO_CHAN(dst[i], rgba[i][RCOMP]);
}
}

if (dstLuminanceIndex >= 0) {
GLchan *dst = dest;
GLuint i;
assert(dstLuminanceIndex == 0);
for (i = 0; i < n; i++) {
/* Luminance comes from red channel */
CLAMPED_FLOAT_TO_CHAN(dst[0], rgba[i][RCOMP]);
dst += dstComponents;
}
}
UNDEFARRAY(rgba); /* mac 32k limitation */
}
}

void
_mesa_unpack_float_color_span( GLcontext *ctx,
GLuint n, GLenum dstFormat, GLfloat dest[],
GLenum srcFormat, GLenum srcType,
const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking,
GLuint transferOps, GLboolean clamp )
{
ASSERT(dstFormat == GL_ALPHA ||
dstFormat == GL_LUMINANCE ||
dstFormat == GL_LUMINANCE_ALPHA ||
dstFormat == GL_INTENSITY ||
dstFormat == GL_RGB ||
dstFormat == GL_RGBA ||
dstFormat == GL_COLOR_INDEX);

ASSERT(srcFormat == GL_RED ||
srcFormat == GL_GREEN ||
srcFormat == GL_BLUE ||
srcFormat == GL_ALPHA ||
srcFormat == GL_LUMINANCE ||
srcFormat == GL_LUMINANCE_ALPHA ||
srcFormat == GL_INTENSITY ||
srcFormat == GL_RGB ||
srcFormat == GL_BGR ||
srcFormat == GL_RGBA ||
srcFormat == GL_BGRA ||
srcFormat == GL_ABGR_EXT ||
srcFormat == GL_COLOR_INDEX);

ASSERT(srcType == GL_BITMAP ||
srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT ||
srcType == GL_UNSIGNED_BYTE_3_3_2 ||
srcType == GL_UNSIGNED_BYTE_2_3_3_REV ||
srcType == GL_UNSIGNED_SHORT_5_6_5 ||
srcType == GL_UNSIGNED_SHORT_5_6_5_REV ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4 ||
srcType == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
srcType == GL_UNSIGNED_SHORT_5_5_5_1 ||
srcType == GL_UNSIGNED_SHORT_1_5_5_5_REV ||
srcType == GL_UNSIGNED_INT_8_8_8_8 ||
srcType == GL_UNSIGNED_INT_8_8_8_8_REV ||
srcType == GL_UNSIGNED_INT_10_10_10_2 ||
srcType == GL_UNSIGNED_INT_2_10_10_10_REV);

/* general solution, no special cases, yet */
{
GLint dstComponents;
GLint dstRedIndex, dstGreenIndex, dstBlueIndex, dstAlphaIndex;
GLint dstLuminanceIndex, dstIntensityIndex;
DEFMARRAY(GLfloat, rgba, MAX_WIDTH, 4); /* mac 32k limitation */
CHECKARRAY(rgba, return); /* mac 32k limitation */

dstComponents = _mesa_components_in_format( dstFormat );
/* source & dest image formats should have been error checked by now */
assert(dstComponents > 0);

/*
* Extract image data and convert to RGBA floats
*/
assert(n <= MAX_WIDTH);
if (srcFormat == GL_COLOR_INDEX) {
GLuint indexes[MAX_WIDTH];
extract_uint_indexes(n, indexes, srcFormat, srcType, source,
srcPacking);

if (dstFormat == GL_COLOR_INDEX
&& (transferOps & IMAGE_MAP_COLOR_BIT)) {
_mesa_map_ci(ctx, n, indexes);
}
if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
_mesa_shift_and_offset_ci(ctx, n, indexes);
}

if (dstFormat == GL_COLOR_INDEX) {
/* convert to GLchan and return */
GLuint i;
for (i = 0; i < n; i++) {
dest[i] = (GLchan) (indexes[i] & 0xff);
}
UNDEFARRAY(rgba); /* mac 32k limitation */
return;
}
else {
/* Convert indexes to RGBA */
_mesa_map_ci_to_rgba(ctx, n, indexes, rgba);
}
}
else {
extract_float_rgba(n, rgba, srcFormat, srcType, source,
srcPacking->SwapBytes);

/* scale and bias colors */
if (transferOps & IMAGE_SCALE_BIAS_BIT) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
}
/* color map lookup */
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_rgba(ctx, n, rgba);
}
}

if (transferOps) {
/* GL_COLOR_TABLE lookup */
if (transferOps & IMAGE_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->ColorTable, n, rgba);
}
/* convolution */
if (transferOps & IMAGE_CONVOLUTION_BIT) {
/* XXX to do */
}
/* GL_POST_CONVOLUTION_RED/GREEN/BLUE/ALPHA_SCALE/BIAS */
if (transferOps & IMAGE_POST_CONVOLUTION_SCALE_BIAS) {
_mesa_scale_and_bias_rgba(ctx, n, rgba,
ctx->Pixel.PostConvolutionScale[RCOMP],
ctx->Pixel.PostConvolutionScale[GCOMP],
ctx->Pixel.PostConvolutionScale[BCOMP],
ctx->Pixel.PostConvolutionScale[ACOMP],
ctx->Pixel.PostConvolutionBias[RCOMP],
ctx->Pixel.PostConvolutionBias[GCOMP],
ctx->Pixel.PostConvolutionBias[BCOMP],
ctx->Pixel.PostConvolutionBias[ACOMP]);
}
/* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostConvolutionColorTable, n, rgba);
}
/* color matrix transform */
if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
_mesa_transform_rgba(ctx, n, rgba);
}
/* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
_mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, n, rgba);
}
/* update histogram count */
if (transferOps & IMAGE_HISTOGRAM_BIT) {
_mesa_update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
/* min/max here */
if (transferOps & IMAGE_MIN_MAX_BIT) {
_mesa_update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
}
}

/* clamp to [0,1] */
#if CHAN_TYPE != GL_FLOAT
if (clamp) {
GLuint i;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
}
}
#endif

/* Now determine which color channels we need to produce.
* And determine the dest index (offset) within each color tuple.
*/
switch (dstFormat) {
case GL_ALPHA:
dstAlphaIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = -1;
dstLuminanceIndex = dstIntensityIndex = -1;
break;
case GL_LUMINANCE:
dstLuminanceIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = dstAlphaIndex = -1;
dstIntensityIndex = -1;
break;
case GL_LUMINANCE_ALPHA:
dstLuminanceIndex = 0;
dstAlphaIndex = 1;
dstRedIndex = dstGreenIndex = dstBlueIndex = -1;
dstIntensityIndex = -1;
break;
case GL_INTENSITY:
dstIntensityIndex = 0;
dstRedIndex = dstGreenIndex = dstBlueIndex = dstAlphaIndex = -1;
dstLuminanceIndex = -1;
break;
case GL_RGB:
dstRedIndex = 0;
dstGreenIndex = 1;
dstBlueIndex = 2;
dstAlphaIndex = dstLuminanceIndex = dstIntensityIndex = -1;
break;
case GL_RGBA:
dstRedIndex = 0;
dstGreenIndex = 1;
dstBlueIndex = 2;
dstAlphaIndex = 3;
dstLuminanceIndex = dstIntensityIndex = -1;
break;
default:
_mesa_problem(ctx, "bad dstFormat in _mesa_unpack_float_color_span()");
UNDEFARRAY(rgba); /* mac 32k limitation */
return;
}

/* Now pack results in the requested dstFormat */
if (dstRedIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[dstRedIndex] = rgba[i][RCOMP];
dst += dstComponents;
}
}

if (dstGreenIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[dstGreenIndex] = rgba[i][GCOMP];
dst += dstComponents;
}
}

if (dstBlueIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[dstBlueIndex] = rgba[i][BCOMP];
dst += dstComponents;
}
}

if (dstAlphaIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[dstAlphaIndex] = rgba[i][ACOMP];
dst += dstComponents;
}
}

if (dstIntensityIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
assert(dstIntensityIndex == 0);
assert(dstComponents == 1);
for (i = 0; i < n; i++) {
/* Intensity comes from red channel */
dst[i] = rgba[i][RCOMP];
}
}

if (dstLuminanceIndex >= 0) {
GLfloat *dst = dest;
GLuint i;
assert(dstLuminanceIndex == 0);
for (i = 0; i < n; i++) {
/* Luminance comes from red channel */
dst[0] = rgba[i][RCOMP];
dst += dstComponents;
}
}
UNDEFARRAY(rgba); /* mac 32k limitation */
}
}

/*
* Unpack a row of color index data from a client buffer according to
* the pixel unpacking parameters.
* This is (or will be) used by glDrawPixels, glTexImage[123]D, etc.
*
* Args: ctx - the context
* n - number of pixels
* dstType - destination datatype
* dest - destination array
* srcType - source pixel type
* source - source data pointer
* srcPacking - pixel unpacking parameters
* transferOps - the pixel transfer operations to apply
*/
void
_mesa_unpack_index_span( const GLcontext *ctx, GLuint n,
GLenum dstType, GLvoid *dest,
GLenum srcType, const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking,
GLuint transferOps )
{
ASSERT(srcType == GL_BITMAP ||
srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT);

ASSERT(dstType == GL_UNSIGNED_BYTE ||
dstType == GL_UNSIGNED_SHORT ||
dstType == GL_UNSIGNED_INT);

transferOps &= (IMAGE_MAP_COLOR_BIT | IMAGE_SHIFT_OFFSET_BIT);

/*
* Try simple cases first
*/
if (transferOps == 0 && srcType == GL_UNSIGNED_BYTE
&& dstType == GL_UNSIGNED_BYTE) {
MEMCPY(dest, source, n * sizeof(GLubyte));
}
else if (transferOps == 0 && srcType == GL_UNSIGNED_INT
&& dstType == GL_UNSIGNED_INT && !srcPacking->SwapBytes) {
MEMCPY(dest, source, n * sizeof(GLuint));
}
else {
/*
* general solution
*/
GLuint indexes[MAX_WIDTH];
assert(n <= MAX_WIDTH);

extract_uint_indexes(n, indexes, GL_COLOR_INDEX, srcType, source,
srcPacking);

if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
/* shift and offset indexes */
_mesa_shift_and_offset_ci(ctx, n, indexes);
}
if (transferOps & IMAGE_MAP_COLOR_BIT) {
/* Apply lookup table */
_mesa_map_ci(ctx, n, indexes);
}

/* convert to dest type */
switch (dstType) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLubyte) (indexes[i] & 0xff);
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLuint *dst = (GLuint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLushort) (indexes[i] & 0xffff);
}
}
break;
case GL_UNSIGNED_INT:
MEMCPY(dest, indexes, n * sizeof(GLuint));
break;
default:
_mesa_problem(ctx, "bad dstType in _mesa_unpack_index_span");
}
}
}

void
_mesa_pack_index_span( const GLcontext *ctx, GLuint n,
GLenum dstType, GLvoid *dest, const GLuint *source,
const struct gl_pixelstore_attrib *dstPacking,
GLuint transferOps )
{
GLuint indexes[MAX_WIDTH];

ASSERT(n <= MAX_WIDTH);

transferOps &= (IMAGE_MAP_COLOR_BIT | IMAGE_SHIFT_OFFSET_BIT);

if (transferOps & (IMAGE_MAP_COLOR_BIT | IMAGE_SHIFT_OFFSET_BIT)) {
/* make a copy of input */
MEMCPY(indexes, source, n * sizeof(GLuint));
if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
_mesa_shift_and_offset_ci( ctx, n, indexes);
}
if (transferOps & IMAGE_MAP_COLOR_BIT) {
_mesa_map_ci(ctx, n, indexes);
}
source = indexes;
}

switch (dstType) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
*dst++ = (GLubyte) source[i];
}
}
break;
case GL_BYTE:
{
GLbyte *dst = (GLbyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLbyte) source[i];
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort *dst = (GLushort *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLushort) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_SHORT:
{
GLshort *dst = (GLshort *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLshort) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint *dst = (GLuint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLuint) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_INT:
{
GLint *dst = (GLint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLint) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_FLOAT:
{
GLfloat *dst = (GLfloat *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLfloat) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
default:
_mesa_problem(ctx, "bad type in _mesa_pack_index_span");
}
}

/*
* Unpack a row of stencil data from a client buffer according to
* the pixel unpacking parameters.
* This is (or will be) used by glDrawPixels
*
* Args: ctx - the context
* n - number of pixels
* dstType - destination datatype
* dest - destination array
* srcType - source pixel type
* source - source data pointer
* srcPacking - pixel unpacking parameters
* transferOps - apply offset/bias/lookup ops?
*/
void
_mesa_unpack_stencil_span( const GLcontext *ctx, GLuint n,
GLenum dstType, GLvoid *dest,
GLenum srcType, const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking,
GLuint transferOps )
{
ASSERT(srcType == GL_BITMAP ||
srcType == GL_UNSIGNED_BYTE ||
srcType == GL_BYTE ||
srcType == GL_UNSIGNED_SHORT ||
srcType == GL_SHORT ||
srcType == GL_UNSIGNED_INT ||
srcType == GL_INT ||
srcType == GL_FLOAT);

ASSERT(dstType == GL_UNSIGNED_BYTE ||
dstType == GL_UNSIGNED_SHORT ||
dstType == GL_UNSIGNED_INT);

/* only shift and offset apply to stencil */
transferOps &= IMAGE_SHIFT_OFFSET_BIT;

/*
* Try simple cases first
*/
if (transferOps == 0 &&
srcType == GL_UNSIGNED_BYTE &&
dstType == GL_UNSIGNED_BYTE) {
MEMCPY(dest, source, n * sizeof(GLubyte));
}
else if (transferOps == 0 &&
srcType == GL_UNSIGNED_INT &&
dstType == GL_UNSIGNED_INT &&
!srcPacking->SwapBytes) {
MEMCPY(dest, source, n * sizeof(GLuint));
}
else {
/*
* general solution
*/
GLuint indexes[MAX_WIDTH];
assert(n <= MAX_WIDTH);

extract_uint_indexes(n, indexes, GL_COLOR_INDEX, srcType, source,
srcPacking);

if (transferOps) {
if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
/* shift and offset indexes */
_mesa_shift_and_offset_ci(ctx, n, indexes);
}

if (ctx->Pixel.MapStencilFlag) {
/* Apply stencil lookup table */
GLuint mask = ctx->Pixel.MapStoSsize - 1;
GLuint i;
for (i=0;i<n;i++) {
indexes[i] = ctx->Pixel.MapStoS[ indexes[i] & mask ];
}
}
}

/* convert to dest type */
switch (dstType) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLubyte) (indexes[i] & 0xff);
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLuint *dst = (GLuint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = (GLushort) (indexes[i] & 0xffff);
}
}
break;
case GL_UNSIGNED_INT:
MEMCPY(dest, indexes, n * sizeof(GLuint));
break;
default:
_mesa_problem(ctx, "bad dstType in _mesa_unpack_stencil_span");
}
}
}

void
_mesa_pack_stencil_span( const GLcontext *ctx, GLuint n,
GLenum dstType, GLvoid *dest, const GLstencil *source,
const struct gl_pixelstore_attrib *dstPacking )
{
GLstencil stencil[MAX_WIDTH];

ASSERT(n <= MAX_WIDTH);

if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset ||
ctx->Pixel.MapStencilFlag) {
/* make a copy of input */
MEMCPY(stencil, source, n * sizeof(GLstencil));
if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset) {
_mesa_shift_and_offset_stencil( ctx, n, stencil );
}
if (ctx->Pixel.MapStencilFlag) {
_mesa_map_stencil( ctx, n, stencil );
}
source = stencil;
}

switch (dstType) {
case GL_UNSIGNED_BYTE:
if (sizeof(GLstencil) == 8) {
MEMCPY( dest, source, n );
}
else {
GLubyte *dst = (GLubyte *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLubyte) source[i];
}
}
break;
case GL_BYTE:
if (sizeof(GLstencil) == 8) {
MEMCPY( dest, source, n );
}
else {
GLbyte *dst = (GLbyte *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLbyte) source[i];
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort *dst = (GLushort *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLushort) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_SHORT:
{
GLshort *dst = (GLshort *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLshort) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint *dst = (GLuint *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLuint) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_INT:
{
GLint *dst = (GLint *) dest;
GLuint i;
for (i=0;i<n;i++) {
*dst++ = (GLint) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_FLOAT:
{
GLfloat *dst = (GLfloat *) dest;
GLuint i;
for (i=0;i<n;i++) {
dst[i] = (GLfloat) source[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_BITMAP:
if (dstPacking->LsbFirst) {
GLubyte *dst = (GLubyte *) dest;
GLint shift = 0;
GLuint i;
for (i = 0; i < n; i++) {
if (shift == 0)
*dst = 0;
*dst |= ((source[i] != 0) << shift);
shift++;
if (shift == 8) {
shift = 0;
dst++;
}
}
}
else {
GLubyte *dst = (GLubyte *) dest;
GLint shift = 7;
GLuint i;
for (i = 0; i < n; i++) {
if (shift == 7)
*dst = 0;
*dst |= ((source[i] != 0) << shift);
shift--;
if (shift < 0) {
shift = 7;
dst++;
}
}
}
break;
default:
_mesa_problem(ctx, "bad type in _mesa_pack_index_span");
}
}

void
_mesa_unpack_depth_span( const GLcontext *ctx, GLuint n, GLfloat *dest,
GLenum srcType, const GLvoid *source,
const struct gl_pixelstore_attrib *srcPacking )
{
switch (srcType) {
case GL_BYTE:
{
GLuint i;
const GLubyte *src = (const GLubyte *) source;
for (i = 0; i < n; i++) {
dest[i] = BYTE_TO_FLOAT(src[i]);
}
}
break;
case GL_UNSIGNED_BYTE:
{
GLuint i;
const GLubyte *src = (const GLubyte *) source;
for (i = 0; i < n; i++) {
dest[i] = UBYTE_TO_FLOAT(src[i]);
}
}
break;
case GL_SHORT:
{
GLuint i;
const GLshort *src = (const GLshort *) source;
for (i = 0; i < n; i++) {
dest[i] = SHORT_TO_FLOAT(src[i]);
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLuint i;
const GLushort *src = (const GLushort *) source;
for (i = 0; i < n; i++) {
dest[i] = USHORT_TO_FLOAT(src[i]);
}
}
break;
case GL_INT:
{
GLuint i;
const GLint *src = (const GLint *) source;
for (i = 0; i < n; i++) {
dest[i] = INT_TO_FLOAT(src[i]);
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint i;
const GLuint *src = (const GLuint *) source;
for (i = 0; i < n; i++) {
dest[i] = UINT_TO_FLOAT(src[i]);
}
}
break;
case GL_FLOAT:
MEMCPY(dest, source, n * sizeof(GLfloat));
break;
default:
_mesa_problem(NULL, "bad type in _mesa_unpack_depth_span()");
return;
}

/* apply depth scale and bias and clamp to [0,1] */
if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0) {
GLuint i;
for (i = 0; i < n; i++) {
GLfloat d = dest[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
dest[i] = CLAMP(d, 0.0F, 1.0F);
}
}
}

/*
* Pack an array of depth values. The values are floats in [0,1].
*/
void
_mesa_pack_depth_span( const GLcontext *ctx, GLuint n, GLvoid *dest,
GLenum dstType, const GLfloat *depthSpan,
const struct gl_pixelstore_attrib *dstPacking )
{
GLfloat depthCopy[MAX_WIDTH];
const GLboolean bias_or_scale = ctx->Pixel.DepthBias != 0.0 ||
ctx->Pixel.DepthScale != 1.0;

ASSERT(n <= MAX_WIDTH);

if (bias_or_scale) {
GLuint i;
for (i = 0; i < n; i++) {
GLfloat d;
d = depthSpan[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
depthCopy[i] = CLAMP(d, 0.0F, 1.0F);
}
depthSpan = depthCopy;
}

switch (dstType) {
case GL_UNSIGNED_BYTE:
{
GLubyte *dst = (GLubyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_UBYTE( depthSpan[i] );
}
}
break;
case GL_BYTE:
{
GLbyte *dst = (GLbyte *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_BYTE( depthSpan[i] );
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort *dst = (GLushort *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_USHORT( depthSpan[i] );
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_SHORT:
{
GLshort *dst = (GLshort *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_SHORT( depthSpan[i] );
}
if (dstPacking->SwapBytes) {
_mesa_swap2( (GLushort *) dst, n );
}
}
break;
case GL_UNSIGNED_INT:
{
GLuint *dst = (GLuint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_UINT( depthSpan[i] );
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_INT:
{
GLint *dst = (GLint *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = FLOAT_TO_INT( depthSpan[i] );
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
case GL_FLOAT:
{
GLfloat *dst = (GLfloat *) dest;
GLuint i;
for (i = 0; i < n; i++) {
dst[i] = depthSpan[i];
}
if (dstPacking->SwapBytes) {
_mesa_swap4( (GLuint *) dst, n );
}
}
break;
default:
_mesa_problem(ctx, "bad type in _mesa_pack_depth_span");
}
}

/*
* Unpack image data. Apply byteswapping, byte flipping (bitmap).
* Return all image data in a contiguous block.
*/
void *
_mesa_unpack_image( GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type, const GLvoid *pixels,
const struct gl_pixelstore_attrib *unpack )
{
GLint bytesPerRow, compsPerRow;
GLboolean flipBytes, swap2, swap4;

if (!pixels)
return NULL; /* not necessarily an error */

if (width <= 0 || height <= 0 || depth <= 0)
return NULL; /* generate error later */

if (format == GL_BITMAP) {
bytesPerRow = (width + 7) >> 3;
flipBytes = !unpack->LsbFirst;
swap2 = swap4 = GL_FALSE;
compsPerRow = 0;
}
else {
const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
const GLint components = _mesa_components_in_format(format);
GLint bytesPerComp;
if (bytesPerPixel <= 0 || components <= 0)
return NULL; /* bad format or type. generate error later */
bytesPerRow = bytesPerPixel * width;
bytesPerComp = bytesPerPixel / components;
flipBytes = GL_FALSE;
swap2 = (bytesPerComp == 2) && unpack->SwapBytes;
swap4 = (bytesPerComp == 4) && unpack->SwapBytes;
compsPerRow = components * width;
assert(compsPerRow >= width);
}

{
GLubyte *destBuffer = (GLubyte *) MALLOC(bytesPerRow * height * depth);
GLubyte *dst;
GLint img, row;
if (!destBuffer)
return NULL; /* generate GL_OUT_OF_MEMORY later */

dst = destBuffer;
for (img = 0; img < depth; img++) {
for (row = 0; row < height; row++) {
const GLvoid *src = _mesa_image_address(unpack, pixels,
width, height, format, type, img, row, 0);
MEMCPY(dst, src, bytesPerRow);
/* byte flipping/swapping */
if (flipBytes) {
flip_bytes((GLubyte *) dst, bytesPerRow);
}
else if (swap2) {
_mesa_swap2((GLushort*) dst, compsPerRow);
}
else if (swap4) {
_mesa_swap4((GLuint*) dst, compsPerRow);
}
dst += bytesPerRow;
}
}
return destBuffer;
}
}

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(root)/shark/branches/xen/ports/mesa/src/image.c @ 1683 - Rev 1618