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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 = 0;
int skipRows = 0;
int skipPixels = 0;
int alignment = 1;
int imageHeight = 0;
int skipImages = 0;
if (pack) {
glGetIntegerv(GL_PACK_ROW_LENGTH, imageSizeTemp, 0);
rowLength = imageSizeTemp[0];
glGetIntegerv(GL_PACK_SKIP_ROWS, imageSizeTemp, 0);
skipRows = imageSizeTemp[0];
glGetIntegerv(GL_PACK_SKIP_PIXELS, imageSizeTemp, 0);
skipPixels = imageSizeTemp[0];
glGetIntegerv(GL_PACK_ALIGNMENT, imageSizeTemp, 0);
alignment = imageSizeTemp[0];
if (dimensions > 2) {
glGetIntegerv(GL_PACK_IMAGE_HEIGHT, imageSizeTemp, 0);
imageHeight = imageSizeTemp[0];
glGetIntegerv(GL_PACK_SKIP_IMAGES, imageSizeTemp, 0);
skipImages = imageSizeTemp[0];
}
} else {
glGetIntegerv(GL_UNPACK_ROW_LENGTH, imageSizeTemp, 0);
rowLength = imageSizeTemp[0];
glGetIntegerv(GL_UNPACK_SKIP_ROWS, imageSizeTemp, 0);
skipRows = imageSizeTemp[0];
glGetIntegerv(GL_UNPACK_SKIP_PIXELS, imageSizeTemp, 0);
skipPixels = imageSizeTemp[0];
glGetIntegerv(GL_UNPACK_ALIGNMENT, imageSizeTemp, 0);
alignment = imageSizeTemp[0];
if (dimensions > 2) {
glGetIntegerv(GL_UNPACK_IMAGE_HEIGHT, imageSizeTemp, 0);
imageHeight = imageSizeTemp[0];
glGetIntegerv(GL_UNPACK_SKIP_IMAGES, imageSizeTemp, 0);
skipImages = imageSizeTemp[0];
}
}
// Try to deal somewhat correctly with potentially invalid values
rowLength = Math.max(0, rowLength);
skipRows = Math.max(0, skipRows);
skipPixels = Math.max(0, skipPixels);
alignment = Math.max(1, alignment);
imageHeight = Math.max(0, imageHeight);
skipImages = Math.max(0, skipImages);
rowLength = Math.max(rowLength, w + skipPixels);
int rowLengthInBytes = rowLength * bytesPerElement;
if (alignment > 1) {
int modulus = rowLengthInBytes % alignment;
if (modulus > 0) {
rowLengthInBytes += alignment - modulus;
}
}
int size = 0;
if (dimensions == 1) {
return (w + skipPixels) * bytesPerElement;
} else {
int size2D = ((skipRows + h - 1) * rowLengthInBytes) + (w + skipPixels) * bytesPerElement;
if (dimensions == 2) {
return size2D;
}
int imageSizeInBytes = imageHeight * rowLength;
return ((skipImages + d - 1) * imageSizeInBytes) + size2D;
}
}
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