| /* |
| * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| #include "mlib_image.h" |
| |
| #include <jni.h> |
| #include "jni_util.h" |
| |
| /* |
| * Declare library specific JNI_Onload entry if static build |
| */ |
| DEF_STATIC_JNI_OnLoad |
| |
| /***************************************************************/ |
| typedef union { |
| mlib_d64 db; |
| struct { |
| #ifdef _LITTLE_ENDIAN |
| mlib_s32 int1, int0; |
| #else |
| mlib_s32 int0, int1; |
| #endif |
| } two_int; |
| } type_union_mlib_d64; |
| |
| #define DVAIN52 4.503599627370496e15 |
| |
| /***************************************************************/ |
| mlib_s32 mlib_ilogb(mlib_d64 X) |
| { |
| type_union_mlib_d64 arg; |
| mlib_s32 n; |
| |
| if (X == 0.0) |
| return -MLIB_S32_MAX; |
| arg.db = X; |
| n = arg.two_int.int0 & 0x7ff00000; |
| if (n) |
| n = (n < 0x7ff00000) ? (n >> 20) - 1023 : MLIB_S32_MAX; |
| else { |
| arg.db = X * DVAIN52; |
| n = ((arg.two_int.int0 & 0x7ff00000) >> 20) - 1075; |
| } |
| return n; |
| } |
| |
| /***************************************************************/ |
