Java example source code file (DrawRect.c)

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Java - Java tags/keywords

bump_noop, bump_pos_pixel, bump_pos_scan, drawlinefunc, grprim_sg2dgetclip, grprim_sg2dgetpixel, java_sun_java2d_loops_drawrect_drawrect, jnienv, jniexport, nativeprimitive, null, sd_success, surfacedata_invokerelease, surfacedataops

The DrawRect.c Java example source code

/*
 * Copyright (c) 2000, 2001, 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 "GraphicsPrimitiveMgr.h"
#include "LineUtils.h"

#include "sun_java2d_loops_DrawRect.h"

/*
 * Class:     sun_java2d_loops_DrawRect
 * Method:    DrawRect
 * Signature: (Lsun/java2d/SunGraphics2D;Lsun/java2d/SurfaceData;IIII)V
 */
JNIEXPORT void JNICALL
Java_sun_java2d_loops_DrawRect_DrawRect
    (JNIEnv *env, jobject self,
     jobject sg2d, jobject sData,
     jint x, jint y, jint w, jint h)
{
    SurfaceDataOps *sdOps;
    SurfaceDataRasInfo rasInfo;
    NativePrimitive *pPrim;
    CompositeInfo compInfo;
    jint lox, loy, hix, hiy;
    jint pixel = GrPrim_Sg2dGetPixel(env, sg2d);

    if (w < 0 || h < 0) {
        return;
    }

    pPrim = GetNativePrim(env, self);
    if (pPrim == NULL) {
        return;
    }
    if (pPrim->pCompType->getCompInfo != NULL) {
        GrPrim_Sg2dGetCompInfo(env, sg2d, pPrim, &compInfo);
    }

    sdOps = SurfaceData_GetOps(env, sData);
    if (sdOps == 0) {
        return;
    }

    lox = x;
    loy = y;
    hix = x + w + 1;
    hiy = y + h + 1;
    if (hix < lox) {
        hix = 0x7fffffff;
    }
    if (hiy < loy) {
        hiy = 0x7fffffff;
    }

    GrPrim_Sg2dGetClip(env, sg2d, &rasInfo.bounds);
    if (rasInfo.bounds.x1 < lox) rasInfo.bounds.x1 = lox;
    if (rasInfo.bounds.y1 < loy) rasInfo.bounds.y1 = loy;
    if (rasInfo.bounds.x2 > hix) rasInfo.bounds.x2 = hix;
    if (rasInfo.bounds.y2 > hiy) rasInfo.bounds.y2 = hiy;
    if (sdOps->Lock(env, sdOps, &rasInfo, pPrim->dstflags) != SD_SUCCESS) {
        return;
    }

    if (rasInfo.bounds.x2 > rasInfo.bounds.x1 &&
        rasInfo.bounds.y2 > rasInfo.bounds.y1)
    {
        sdOps->GetRasInfo(env, sdOps, &rasInfo);
        if (rasInfo.rasBase) {
            DrawLineFunc *pLine = pPrim->funcs.drawline;
            int loyin = (loy == rasInfo.bounds.y1);
            int hiyin = (hiy == rasInfo.bounds.y2);
            int xsize = (rasInfo.bounds.x2 - rasInfo.bounds.x1);
            int ysize = (rasInfo.bounds.y2 - rasInfo.bounds.y1 - loyin - hiyin);
            /*
             * To avoid drawing the corners twice (both for performance
             * and because XOR erases them otherwise) and to maximize the
             * number of pixels we draw in the horizontal portions
             * which are more cache-friendly, we include the corner
             * pixels only in the top and bottom segments.
             * We also protect against degenerate rectangles where we
             * would draw the same line for top & bottom or left & right.
             */
            if (loyin) {
                /* Line across the top */
                (*pLine)(&rasInfo,
                         rasInfo.bounds.x1, rasInfo.bounds.y1,
                         pixel, xsize, 0,
                         BUMP_POS_PIXEL, 0, BUMP_NOOP, 0, pPrim, &compInfo);
            }
            if (lox == rasInfo.bounds.x1 && ysize > 0) {
                /* Line down the left side */
                (*pLine)(&rasInfo,
                         rasInfo.bounds.x1, rasInfo.bounds.y1 + loyin,
                         pixel, ysize, 0,
                         BUMP_POS_SCAN, 0, BUMP_NOOP, 0, pPrim, &compInfo);
            }
            if (hix == rasInfo.bounds.x2 && ysize > 0 && lox != hix - 1) {
                /* Line down the right side */
                (*pLine)(&rasInfo,
                         rasInfo.bounds.x2 - 1, rasInfo.bounds.y1 + loyin,
                         pixel, ysize, 0,
                         BUMP_POS_SCAN, 0, BUMP_NOOP, 0, pPrim, &compInfo);
            }
            if (hiyin && loy != hiy - 1) {
                /* Line across the bottom */
                (*pLine)(&rasInfo,
                         rasInfo.bounds.x1, rasInfo.bounds.y2 - 1,
                         pixel, xsize, 0,
                         BUMP_POS_PIXEL, 0, BUMP_NOOP, 0, pPrim, &compInfo);
            }
        }
        SurfaceData_InvokeRelease(env, sdOps, &rasInfo);
    }
    SurfaceData_InvokeUnlock(env, sdOps, &rasInfo);
}