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private int[] imageSizeTemp = new int[1];
/** Helper for more precise computation of number of bytes that will
be touched by a pixel pack or unpack operation. */
private int imageSizeInBytes(int bytesPerElement,
int w, int h, int d,
int dimensions,
boolean pack) {
int rowLength = w;
int alignment = 1;
if (pack) {
glGetIntegerv(GL_PACK_ALIGNMENT, imageSizeTemp, 0);
alignment = imageSizeTemp[0];
} else {
glGetIntegerv(GL_UNPACK_ALIGNMENT, imageSizeTemp, 0);
alignment = imageSizeTemp[0];
}
// Try to deal somewhat correctly with potentially invalid values
rowLength = Math.max(0, rowLength);
alignment = Math.max(1, alignment);
h = Math.max(0, h);
int rowLengthInBytes = rowLength * bytesPerElement;
if (alignment > 1) {
int modulus = rowLengthInBytes % alignment;
if (modulus > 0) {
rowLengthInBytes += alignment - modulus;
}
}
int size = 0;
if (dimensions == 1) {
return rowLengthInBytes;
} else {
return h * rowLengthInBytes;
}
}
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