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// BEGIN_COPYRIGHT
//
// Copyright (C) 1999 Allen Akin 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 ALLEN AKIN 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.
//
// END_COPYRIGHT
// Data packing utilities. Note that these map component values per
// the usual OpenGL conversions. Also, see comments in unpack.cpp.
#include "image.h"
namespace {
#define SCALE (static_cast<double>(num) / static_cast<double>(denom))
#define BIAS (static_cast<double>(bias) / static_cast<double>(denom))
// The original implementation of packing functions (using function
// templates) wouldn't compile under VC6, but this slight variant
// using static member functions in a class template will compile.
template<class component, int num, unsigned int denom, int bias>
class Pack
{
public :
// pack_l
static void pack_l(GLsizei n, char* dst, double* rgba)
{
component* out = reinterpret_cast<component*>(dst);
double* end = rgba + 4 * n;
for (; rgba != end; rgba += 4) {
if (bias)
out[0] = static_cast<component>(SCALE * rgba[0] - BIAS);
else
out[0] = static_cast<component>(SCALE * rgba[0]);
out += 1;
}
}
// pack_la
static void pack_la(GLsizei n, char* dst, double* rgba)
{
component* out = reinterpret_cast<component*>(dst);
double* end = rgba + 4 * n;
for (; rgba != end; rgba += 4) {
if (bias) {
out[0] = static_cast<component>(SCALE * rgba[0] - BIAS);
out[1] = static_cast<component>(SCALE * rgba[3] - BIAS);
} else {
out[0] = static_cast<component>(SCALE * rgba[0]);
out[1] = static_cast<component>(SCALE * rgba[3]);
}
out += 2;
}
}
// pack_rga
static void pack_rgb(GLsizei n, char* dst, double* rgba)
{
component* out = reinterpret_cast<component*>(dst);
double* end = rgba + 4 * n;
for (; rgba != end; rgba += 4) {
if (bias) {
out[0] = static_cast<component>(SCALE * rgba[0] - BIAS);
out[1] = static_cast<component>(SCALE * rgba[1] - BIAS);
out[2] = static_cast<component>(SCALE * rgba[2] - BIAS);
} else {
out[0] = static_cast<component>(SCALE * rgba[0]);
out[1] = static_cast<component>(SCALE * rgba[1]);
out[2] = static_cast<component>(SCALE * rgba[2]);
}
out += 3;
}
}
// pack_rgba
static void pack_rgba(GLsizei n, char* dst, double* rgba)
{
component* out = reinterpret_cast<component*>(dst);
double* end = rgba + 4 * n;
for (; rgba != end; rgba += 4) {
if (bias) {
out[0] = static_cast<component>(SCALE * rgba[0] - BIAS);
out[1] = static_cast<component>(SCALE * rgba[1] - BIAS);
out[2] = static_cast<component>(SCALE * rgba[2] - BIAS);
out[3] = static_cast<component>(SCALE * rgba[3] - BIAS);
} else {
out[0] = static_cast<component>(SCALE * rgba[0]);
out[1] = static_cast<component>(SCALE * rgba[1]);
out[2] = static_cast<component>(SCALE * rgba[2]);
out[3] = static_cast<component>(SCALE * rgba[3]);
}
out += 4;
}
}
}; // class Pack
#undef SCALE
#undef BIAS
}; // anonymous namespace
namespace GLEAN {
///////////////////////////////////////////////////////////////////////////////
// Public interface
///////////////////////////////////////////////////////////////////////////////
void
Image::pack(GLsizei n, char* nextPixel, double* rgba) {
(*(valid(vbPacker)? _packer: validatePacker())) (n, nextPixel, rgba);
}
///////////////////////////////////////////////////////////////////////////////
// validatePacker - select appropriate pixel-packing utility
///////////////////////////////////////////////////////////////////////////////
Image::Packer*
Image::validatePacker() {
switch (format()) {
case GL_LUMINANCE:
switch (type()) {
case GL_BYTE:
_packer = Pack<GLbyte, 255, 2, 1>::pack_l;
break;
case GL_UNSIGNED_BYTE:
_packer = Pack<GLubyte, 255, 1, 0>::pack_l;
break;
case GL_SHORT:
_packer = Pack<GLshort, 65535, 2, 1>::pack_l;
break;
case GL_UNSIGNED_SHORT:
_packer = Pack<GLushort, 65535, 1, 0>::pack_l;
break;
case GL_INT:
_packer = Pack<GLint, 4294967295U, 2, 1>::pack_l;
break;
case GL_UNSIGNED_INT:
_packer = Pack<GLuint, 4294967295U, 1, 0>::pack_l;
break;
case GL_FLOAT:
_packer = Pack<GLfloat, 1, 1, 0>::pack_l;
break;
default:
throw BadType(type());
}
break;
case GL_LUMINANCE_ALPHA:
switch (type()) {
case GL_BYTE:
_packer = Pack<GLbyte, 255, 2, 1>::pack_la;
break;
case GL_UNSIGNED_BYTE:
_packer = Pack<GLubyte, 255, 1, 0>::pack_la;
break;
case GL_SHORT:
_packer = Pack<GLshort, 65535, 2, 1>::pack_la;
break;
case GL_UNSIGNED_SHORT:
_packer = Pack<GLushort, 65535, 1, 0>::pack_la;
break;
case GL_INT:
_packer = Pack<GLint, 4294967295U, 2, 1>::pack_la;
break;
case GL_UNSIGNED_INT:
_packer = Pack<GLuint, 4294967295U, 1, 0>::pack_la;
break;
case GL_FLOAT:
_packer = Pack<GLfloat, 1, 1, 0>::pack_la;
break;
default:
throw BadType(type());
}
break;
case GL_RGB:
switch (type()) {
case GL_BYTE:
_packer = Pack<GLbyte, 255, 2, 1>::pack_rgb;
break;
case GL_UNSIGNED_BYTE:
_packer = Pack<GLubyte, 255, 1, 0>::pack_rgb;
break;
case GL_SHORT:
_packer = Pack<GLshort, 65535, 2, 1>::pack_rgb;
break;
case GL_UNSIGNED_SHORT:
_packer = Pack<GLushort, 65535, 1, 0>::pack_rgb;
break;
case GL_INT:
_packer = Pack<GLint, 4294967295U, 2, 1>::pack_rgb;
break;
case GL_UNSIGNED_INT:
_packer = Pack<GLuint, 4294967295U, 1, 0>::pack_rgb;
break;
case GL_FLOAT:
_packer = Pack<GLfloat, 1, 1, 0>::pack_rgb;
break;
default:
throw BadType(type());
}
break;
case GL_RGBA:
switch (type()) {
case GL_BYTE:
_packer = Pack<GLbyte, 255, 2, 1>::pack_rgba;
break;
case GL_UNSIGNED_BYTE:
_packer = Pack<GLubyte, 255, 1, 0>::pack_rgba;
break;
case GL_SHORT:
_packer = Pack<GLshort, 65535, 2, 1>::pack_rgba;
break;
case GL_UNSIGNED_SHORT:
_packer = Pack<GLushort, 65535, 1, 0>::pack_rgba;
break;
case GL_INT:
_packer = Pack<GLint, 4294967295U, 2, 1>::pack_rgba;
break;
case GL_UNSIGNED_INT:
_packer = Pack<GLuint, 4294967295U, 1, 0>::pack_rgba;
break;
case GL_FLOAT:
_packer = Pack<GLfloat, 1, 1, 0>::pack_rgba;
break;
default:
throw BadType(type());
}
break;
default:
throw BadFormat(format());
}
validate(vbPacker);
return _packer;
}
}; // namespace GLEAN
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