JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1996, 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.
 */

/*
 * This file contains macro definitions for the Storing category of
 * the macros used by the generic scaleloop function.
 *
 * This implementation can store 8-bit or 16-bit pixels into an array
 * of bytes or shorts such that the pixel for (srcX, srcY) is stored at
 * index (srcOff + srcY * srcScan + srcX) in the array.
 *
 * This implementation can also store 24-bit pixels into an array of bytes
 * as three consecutive bytes such that the pixel for (srcX, srcY) is
 * stored at indices (srcOff + srcY * srcScan + srcX * 3 + C) in the
 * array, where C == 0 for the blue component, 1 for the green component,
 * and 2 for the red component.
 */

#define DeclareOutputVars                               \
    pixptr dstP;                                        \
    int pixsz;

#define InitOutput(cvdata, clrdata, dstX, dstY)                 \
    do {                                                        \
        switch (clrdata->bitsperpixel) {                        \
        case 8: pixsz = 1; break;                               \
        case 16: pixsz = 2; break;                              \
        case 24: pixsz = 3; break;                              \
        default:                                                \
            SignalError(0, JAVAPKG "InternalError",             \
                        "unsupported screen depth");            \
            return SCALEFAILURE;                                \
        }                                                       \
        img_check(pixsz != 2 || (ScanBytes(cvdata) & 1) == 0);  \
        dstP.vp = cvdata->outbuf;                               \
        dstP.bp += dstY * ScanBytes(cvdata) + dstX * pixsz;     \
    } while (0)

#define PutPixelInc(pixel, red, green, blue)                    \
    do {                                                        \
        switch (pixsz) {                                        \
        case 1:                                                 \
            *dstP.bp++ = ((unsigned char) pixel);               \
            break;                                              \
        case 2:                                                 \
            *dstP.sp++ = ((unsigned short) pixel);              \
            break;                                              \
        case 3:                                                 \
            *dstP.bp++ = blue;                                  \
            *dstP.bp++ = green;                                 \
            *dstP.bp++ = red;                                   \
            break;                                              \

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