/*

     File: DrawingCanvas.m

 Abstract: Native code that draws into an AWT Canvas.

  Version: 2.0

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#import <Cocoa/Cocoa.h>

#import <JavaVM/jawt_md.h>

#import <JavaNativeFoundation/JavaNativeFoundation.h>

#include "com_apple_dts_samplecode_jawtexample_NativeDrawnCanvas.h"

/*

 * Class:     com_apple_dts_samplecode_jawtexample_NativeDrawnCanvas

 * Method:    nativePaintOnCanvas

 * Signature: ()V

 */

JNIEXPORT void JNICALL Java_com_apple_dts_samplecode_jawtexample_NativeDrawnCanvas_nativePaintOnCanvas

(JNIEnv *env, jobject canvas) {

JNF_COCOA_ENTER(env);

    // get the AWT

    JAWT awt;

    awt.version = JAWT_VERSION_1_4;

    jboolean result = JAWT_GetAWT(env, &awt);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    if (result == JNI_FALSE) return; // NSView access unsupported in future versions of Java for Mac OS X

    // get the drawing surface

    JAWT_DrawingSurface *ds = awt.GetDrawingSurface(env, canvas);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    assert(ds != NULL);

    // lock the drawing surface - must lock EACH TIME before drawing

    jint lock = ds->Lock(ds); 

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    assert((lock & JAWT_LOCK_ERROR) == 0);

    // get the drawing surface info

    JAWT_DrawingSurfaceInfo *dsi = ds->GetDrawingSurfaceInfo(ds);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    // Check DrawingSurfaceInfo. This can be NULL on Mac OS X if the native 

    // component heirachy has not been made visible yet on the AppKit thread.

    if (dsi != NULL) {

        // Get the platform-specific drawing info

        // This is used to get at Cocoa and CoreGraphics

        // See <JavaVM/jawt_md.h>

        JAWT_MacOSXDrawingSurfaceInfo *dsi_mac = (JAWT_MacOSXDrawingSurfaceInfo*)dsi->platformInfo;

        // This drawing does not stictly need to be done on the AppKit thread,

        // but concurrent AppKit drawing may produce unexpected results as this

        // Java thread and the AppKit thread race each other.

        {

            // Get the corresponding peer from the caller canvas

            NSView *view = dsi_mac->cocoaViewRef;

            NSWindow *window = [view window];

            // Get the CoreGraphics context from the parent window - DO NOT CACHE

            CGContextRef cg = [[NSGraphicsContext graphicsContextWithWindow:window] graphicsPort];

            // Match Java's ctm

            NSRect windowRect = [[window contentView] frame];

            CGContextConcatCTM(cg, CGAffineTransformMake(1, 0, 0, -1, dsi->bounds.x, windowRect.size.height - dsi->bounds.y));

            // Draw a pattern using CoreGraphics

            CGContextSetRGBFillColor(cg, 1.0f, 0.0f, 0.0f, 1.0f);

            CGContextFillRect(cg, CGRectMake(15, 15, 70, 70));

        }

        // Free the DrawingSurfaceInfo

        ds->FreeDrawingSurfaceInfo(dsi);

        JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    }

    // Unlock the drawing surface - must unlock EACH TIME when done drawing

    ds->Unlock(ds); 

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    // Free the drawing surface (if not caching it)

    awt.FreeDrawingSurface(ds);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

JNF_COCOA_EXIT(env);

}