private final int gluScaleImageJava(
int format,
int widthin,
int heightin,
int typein,
Buffer datain,
int widthout,
int heightout,
int typeout,
Buffer dataout) {
ByteBuffer in = null;
ByteBuffer out = null;
in = copyToByteBuffer(datain);
if (dataout instanceof ByteBuffer) {
out = (ByteBuffer) dataout;
} else if (dataout instanceof ShortBuffer) {
out = Buffers.newDirectByteBuffer(dataout.remaining() * Buffers.SIZEOF_SHORT);
} else if (dataout instanceof IntBuffer) {
out = Buffers.newDirectByteBuffer(dataout.remaining() * Buffers.SIZEOF_INT);
} else if (dataout instanceof FloatBuffer) {
out = Buffers.newDirectByteBuffer(dataout.remaining() * Buffers.SIZEOF_FLOAT);
} else {
throw new IllegalArgumentException(
"Unsupported destination buffer type (must be byte, short, int, or float)");
}
int errno =
Mipmap.gluScaleImage(
getCurrentGL2(),
format,
widthin,
heightin,
typein,
in,
widthout,
heightout,
typeout,
out);
if (errno == 0) {
out.rewind();
if (out != dataout) {
if (dataout instanceof ShortBuffer) {
((ShortBuffer) dataout).put(out.asShortBuffer());
} else if (dataout instanceof IntBuffer) {
((IntBuffer) dataout).put(out.asIntBuffer());
} else if (dataout instanceof FloatBuffer) {
((FloatBuffer) dataout).put(out.asFloatBuffer());
} else {
throw new RuntimeException("Should not reach here");
}
}
}
return (errno);
}
private final ByteBuffer copyToByteBuffer(Buffer buf) {
if (buf instanceof ByteBuffer) {
if (buf.position() == 0) {
return (ByteBuffer) buf;
}
return Buffers.copyByteBuffer((ByteBuffer) buf);
} else if (buf instanceof ShortBuffer) {
return Buffers.copyShortBufferAsByteBuffer((ShortBuffer) buf);
} else if (buf instanceof IntBuffer) {
return Buffers.copyIntBufferAsByteBuffer((IntBuffer) buf);
} else if (buf instanceof FloatBuffer) {
return Buffers.copyFloatBufferAsByteBuffer((FloatBuffer) buf);
} else {
throw new IllegalArgumentException(
"Unsupported buffer type (must be one of byte, short, int, or float)");
}
}