1 /*

     2  * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 #include "jni.h"

    27 #include "jni_util.h"

    28 #include "jlong.h"

    29 #include <string.h>

    30 

    31 #include "sun_java2d_pipe_RenderBuffer.h"

    32 

    33 /**

    34  * Note: The code in this file is nearly identical to that in

    35  *       java/nio/Bits.c...

    36  */

    37 

    38 #define MBYTE 1048576

    39 

    40 JNIEXPORT void JNICALL

    41 Java_sun_java2d_pipe_RenderBuffer_copyFromArray

    42     (JNIEnv *env, jclass rb,

    43      jobject srcArray, jlong srcPos, jlong dstAddr, jlong length)

    44 {

    45     jbyte *bytes;

    46     size_t size;

    47 

    48     while (length > 0) {

    49         /*

    50          * Copy no more than one megabyte at a time, to allow for GC.

    51          * (Probably not an issue for STR, since our buffer size is likely

    52          * much smaller than a megabyte, but just in case...)

    53          */

    54         size = (size_t)(length > MBYTE ? MBYTE : length);

    55 

    56         bytes = (*env)->GetPrimitiveArrayCritical(env, srcArray, NULL);

    57         if (bytes == NULL) {

    58             JNU_ThrowInternalError(env, "Unable to get array");

    59             return;

    60         }

    61 

    62         memcpy(jlong_to_ptr(dstAddr), bytes + srcPos, size);

    63 

    64         (*env)->ReleasePrimitiveArrayCritical(env, srcArray,

    65                                               bytes, JNI_ABORT);

    66 

    67         length -= size;

    68         dstAddr += size;

    69         srcPos += size;

    70     }

    71 }