1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include "MyCanvas.h"
  27 #include "jawt_md.h"
  28 
  29 /*
  30  * Class:     MyCanvas
  31  * Method:    paint
  32  * Signature: (Ljava/awt/Graphics;)V
  33  */
  34 JNIEXPORT void JNICALL Java_MyCanvas_paint
  35 (JNIEnv* env, jobject canvas, jobject graphics)
  36 {
  37     JAWT awt;
  38     JAWT_DrawingSurface* ds;
  39     JAWT_DrawingSurfaceInfo* dsi;
  40     JAWT_X11DrawingSurfaceInfo* dsi_x11;
  41     jboolean result;
  42     jint lock;
  43     GC gc;
  44     jobject ref;
  45 
  46     /* Get the AWT */
  47     awt.version = JAWT_VERSION_1_4;
  48     if (JAWT_GetAWT(env, &awt) == JNI_FALSE) {
  49         printf("AWT Not found\n");
  50         return;
  51     }
  52 
  53     /* Lock the AWT */
  54     awt.Lock(env);
  55 
  56     /* Unlock the AWT */
  57     awt.Unlock(env);
  58 
  59     /* Get the drawing surface */
  60     ds = awt.GetDrawingSurface(env, canvas);
  61     if (ds == NULL) {
  62         printf("NULL drawing surface\n");
  63         return;
  64     }
  65 
  66     /* Lock the drawing surface */
  67     lock = ds->Lock(ds);
  68     printf("Lock value %d\n", (int)lock);
  69     if((lock & JAWT_LOCK_ERROR) != 0) {
  70         printf("Error locking surface\n");
  71         awt.FreeDrawingSurface(ds);
  72         return;
  73     }
  74 
  75     /* Get the drawing surface info */
  76     dsi = ds->GetDrawingSurfaceInfo(ds);
  77     if (dsi == NULL) {
  78         printf("Error getting surface info\n");
  79         ds->Unlock(ds);
  80         awt.FreeDrawingSurface(ds);
  81         return;
  82     }
  83 
  84     /* Get the platform-specific drawing info */
  85     dsi_x11 = (JAWT_X11DrawingSurfaceInfo*)dsi->platformInfo;
  86 
  87     /* Now paint */
  88     gc = XCreateGC(dsi_x11->display, dsi_x11->drawable, 0, 0);
  89     XSetForeground(dsi_x11->display, gc, 0);
  90     XFillRectangle(dsi_x11->display, dsi_x11->drawable, gc,
  91                    5, 5, 90, 90);
  92     XFreeGC(dsi_x11->display, gc);
  93     ref = awt.GetComponent(env, (void*)(dsi_x11->drawable));
  94     if (!(*env)->IsSameObject(env, ref, canvas)) {
  95         printf("Error! Different objects!\n");
  96     }
  97 
  98     /* Free the drawing surface info */
  99     ds->FreeDrawingSurfaceInfo(dsi);
 100 
 101     /* Unlock the drawing surface */
 102     ds->Unlock(ds);
 103 
 104     /* Free the drawing surface */
 105     awt.FreeDrawingSurface(ds);
 106 }