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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
// Implementation of image data, attribute, and I/O
#include "image.h"
#include <string.h>
namespace GLEAN {
///////////////////////////////////////////////////////////////////////////////
// Constructors/Destructor
///////////////////////////////////////////////////////////////////////////////
// An empty image:
Image::Image() {
_width = _height = 0;
_format = GL_RGB;
_type = GL_UNSIGNED_BYTE;
_pixels = 0;
_alignment = 4;
_packer = 0;
_unpacker = 0;
_invalid = vbAll;
} // Image::Image
// An unitialized image of the given type and size:
Image::Image(int aWidth, int aHeight, GLenum aFormat, GLenum aType) {
_width = aWidth;
_height = aHeight;
_format = aFormat;
_type = aType;
_pixels = 0;
_alignment = 4;
_packer = 0;
_unpacker = 0;
_invalid = vbAll;
reserve();
} // Image::Image(aWidth, aHeight, aFormat, aType)
// An image of the given type and size, initialized to a solid color:
Image::Image(int aWidth, int aHeight, GLenum aFormat, GLenum aType,
double r, double g, double b, double a) {
_width = aWidth;
_height = aHeight;
_format = aFormat;
_type = aType;
_pixels = 0;
_alignment = 4;
_packer = 0;
_unpacker = 0;
_invalid = vbAll;
reserve();
int i; // VC++ 6 doesn't handle the definition of variables in a
// for-statement properly
double* solidColor = new double[4 * width()];
for (/*int */i = 0; i < 4 * width(); i += 4) {
solidColor[i + 0] = r;
solidColor[i + 1] = g;
solidColor[i + 2] = b;
solidColor[i + 3] = a;
}
char* row = pixels();
for (/*int */i = 0; i < height(); ++i) {
pack(width(), row, solidColor);
row += rowSizeInBytes();
}
} // Image::Image(aWidth, aHeight, aFormat, aType)
// Copy constructor:
Image::Image(Image& i) {
_width = i.width();
_height = i.height();
_format = i.format();
_type = i.type();
_alignment = i.alignment();
_pixels = 0;
_packer = 0;
_unpacker = 0;
_invalid = vbAll;
reserve();
memcpy(pixels(), i.pixels(), height() * rowSizeInBytes());
} // Image::Image(Image&)
/*Image::*/Image&
Image::operator= (Image& i) {
if (this == &i)
return *this;
width(i.width());
height(i.height());
format(i.format());
type(i.type());
alignment(i.alignment());
_invalid = vbAll;
reserve();
memcpy(pixels(), i.pixels(), height() * rowSizeInBytes());
return *this;
} // Image::operator=
Image::~Image() {
if (_pixels)
delete[] _pixels;
}
// Test if two images are identical
bool Image::operator==(const Image &img) const
{
// cast away const because of rowSizeInBytes()
Image &img1 = const_cast<Image&>(*this);
Image &img2 = const_cast<Image&>(img);
if (img1.width() != img2.width() ||
img1.height() != img2.height() ||
img1.format() != img2.format() ||
img1.type() != img2.type() ||
img1.alignment() != img2.alignment() ||
img1.rowSizeInBytes() != img2.rowSizeInBytes())
return false;
const char *p1 = img1.pixels();
const char *p2 = img2.pixels();
const int n = img1.rowSizeInBytes() * img1.height();
if (memcmp(p1, p2, n) != 0)
return false;
return true;
}
///////////////////////////////////////////////////////////////////////////////
// pixels - set pointer to pixel array
///////////////////////////////////////////////////////////////////////////////
void
Image::pixels(char* p) {
// We always own our pixels, so delete the old ones (if any) before
// installing new ones:
if (_pixels)
delete[] _pixels;
_pixels = p;
} // Image::pixels
///////////////////////////////////////////////////////////////////////////////
// reserve - reserve memory for image (assuming current type, format, and size)
///////////////////////////////////////////////////////////////////////////////
void
Image::reserve() {
pixels(0); // deallocate old pixel array
pixels(new char[height() * rowSizeInBytes()]);
} // Image::reserve
///////////////////////////////////////////////////////////////////////////////
// validateRowSizeInBytes - compute image row size, measured in bytes
///////////////////////////////////////////////////////////////////////////////
GLsizei
Image::validateRowSizeInBytes() {
_rowSizeInBytes =
(width() * pixelSizeInBytes() + alignment() - 1)
& ~(alignment() - 1);
validate(vbRowSizeInBytes);
return _rowSizeInBytes;
} // Image::calcRowSizeInBytes
///////////////////////////////////////////////////////////////////////////////
// validatePixelSizeInBytes - compute pixel size, measured in bytes
///////////////////////////////////////////////////////////////////////////////
GLsizei
Image::validatePixelSizeInBytes() {
switch (format()) {
case GL_LUMINANCE:
_pixelSizeInBytes = 1;
break;
case GL_LUMINANCE_ALPHA:
_pixelSizeInBytes = 2;
break;
case GL_RGB:
_pixelSizeInBytes = 3;
break;
case GL_RGBA:
_pixelSizeInBytes = 4;
break;
default:
throw BadFormat(format());
}
switch (type()) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
break;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
_pixelSizeInBytes <<= 1;
break;
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
_pixelSizeInBytes <<= 2;
break;
default:
throw BadType(type());
}
validate(vbPixelSizeInBytes);
return _pixelSizeInBytes;
}
}; // namespace GLEAN
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