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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 rowLength, int imageHeight, int depth, boolean pack) {
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 );
imageHeight = Math.max(1, imageHeight); // min 1D
depth = Math.max(1, depth ); // min 1 * imageSize
alignment = Math.max(1, alignment);
int rowLengthInBytes = rowLength * bytesPerElement;
if (alignment > 1) {
int padding = rowLengthInBytes % alignment;
if (padding > 0) {
rowLengthInBytes += alignment - padding;
}
}
/**
* depth is in multiples of image size.
*
* rowlenght is the actual repeating offset
* to go from line n to line n+1 at the same x-axis position.
*/
return
( depth - 1 ) * imageHeight * rowLengthInBytes + // whole images
( imageHeight - 1 ) * rowLengthInBytes + // lines with padding
( rowLength ) * bytesPerElement; // last line
}
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