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 <windows.h> 27 #include "MyCanvas.h" 28 #include "jawt_md.h" 29 30 /* 31 * Class: MyCanvas 32 * Method: paint 33 * Signature: (Ljava/awt/Graphics;)V 34 */ 35 36 extern "C" { 37 38 JNIEXPORT void JNICALL Java_MyCanvas_paint 39 (JNIEnv* env, jobject canvas, jobject graphics) 40 { 41 /* Get the AWT */ 42 JAWT awt; 43 awt.version = JAWT_VERSION_1_4; 44 if (JAWT_GetAWT(env, &awt) == JNI_FALSE) { 45 printf("AWT Not found\n"); 46 return; 47 } 48 49 /* Lock the AWT */ 50 awt.Lock(env); 51 52 /* Unlock the AWT */ 53 awt.Unlock(env); 54 55 /* Get the drawing surface */ 56 JAWT_DrawingSurface* ds = awt.GetDrawingSurface(env, canvas); 57 if (ds == NULL) { 58 printf("NULL drawing surface\n"); 59 return; 60 } 61 62 /* Lock the drawing surface */ 63 jint lock = ds->Lock(ds); 64 printf("Lock value %d\n", (int)lock); 65 if((lock & JAWT_LOCK_ERROR) != 0) { 66 printf("Error locking surface\n"); 67 return; 68 } 69 70 /* Get the drawing surface info */ 71 JAWT_DrawingSurfaceInfo* dsi = ds->GetDrawingSurfaceInfo(ds); 72 if (dsi == NULL) { 73 printf("Error getting surface info\n"); 74 ds->Unlock(ds); 75 return; 76 } 77 78 /* Get the platform-specific drawing info */ 79 JAWT_Win32DrawingSurfaceInfo* dsi_win = 80 (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo; 81 82 /* Now paint */ 83 PAINTSTRUCT ps; 84 /* Do not use the HDC returned from BeginPaint()!! */ 85 ::BeginPaint(dsi_win->hwnd, &ps); 86 HBRUSH hbrush = (HBRUSH)::GetStockObject(BLACK_BRUSH); 87 RECT rect; 88 rect.left = 5; 89 rect.top = 5; 90 rect.right = 95; 91 rect.bottom = 95; 92 ::FillRect(dsi_win->hdc, &rect, hbrush); 93 ::EndPaint(dsi_win->hwnd, &ps); 94 95 jobject ref = awt.GetComponent(env, (void*)(dsi_win->hwnd)); 96 if (!env->IsSameObject(ref, canvas)) { 97 printf("Error! Different objects!\n"); 98 } 99 100 /* Free the drawing surface info */ 101 ds->FreeDrawingSurfaceInfo(dsi); 102 103 /* Unlock the drawing surface */ 104 ds->Unlock(ds); 105 106 /* Free the drawing surface */ 107 awt.FreeDrawingSurface(ds); 108 } 109 110 }