/*

    File: LayerCanvas.m

Abstract: Native code that attaches a CoreAnimation layer to an AWT Canvas.

 Version: 2.0

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*/

#import <Cocoa/Cocoa.h>

#import <Quartz/Quartz.h>

#import <QTKit/QTKit.h>

#import <JavaVM/jawt_md.h>

#import <JavaNativeFoundation/JavaNativeFoundation.h>

#include "com_apple_dts_samplecode_jawtexample_LayerBackedCanvas.h"

// forward declaration

@interface ThreePieceDemoLayer : CALayer { }

@end

/*

 * Class:     com_apple_dts_samplecode_jawtexample_LayerBackedCanvas

 * Method:    addNativeCoreAnimationLayer

 * Signature: ()V

 */

JNIEXPORT void JNICALL Java_com_apple_dts_samplecode_jawtexample_LayerBackedCanvas_addNativeCoreAnimationLayer

(JNIEnv *env, jobject canvas) {

#ifdef JAWT_MACOSX_USE_CALAYER // Java for Mac OS X 10.6 Update 4 or later required

JNF_COCOA_ENTER(env);

    // get the AWT

    JAWT awt;

    awt.version = JAWT_VERSION_1_4 | JAWT_MACOSX_USE_CALAYER; // opt into the CALayer model

    jboolean result = JAWT_GetAWT(env, &awt);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    if (result == JNI_FALSE) return; // CALayer support unavailable prior to Java for Mac OS X 10.6 Update 4

    // get the drawing surface

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

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    assert(ds != NULL);

    // lock the drawing surface

    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) {

        // create and attach the layer on the AppKit thread

        [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){

            // attach the "root layer" to the AWT Canvas surface layers

            id <JAWT_SurfaceLayers> surfaceLayers = (id <JAWT_SurfaceLayers>)dsi->platformInfo;

            surfaceLayers.layer = [[ThreePieceDemoLayer new] autorelease];

        }];

        // free the DrawingSurfaceInfo

        ds->FreeDrawingSurfaceInfo(dsi);

        JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    }

    // unlock the drawing surface

    ds->Unlock(ds); 

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

    // free the drawing surface

    awt.FreeDrawingSurface(ds);

    JNF_CHECK_AND_RETHROW_EXCEPTION(env);

JNF_COCOA_EXIT(env);

#endif // JAWT_MACOSX_USE_CALAYER

}

@interface RotatingSquareGLLayer : NSOpenGLLayer { }

@end

// a "root layer" that contains three sample layers (Quartz Composistion, OpenGL, and QuickTime)

@implementation ThreePieceDemoLayer

- (id) init {

    self = [super init];

    if (!self) return nil;

    // instance handles it's own layout

    self.layoutManager = self;

    // create a Quartz Composistion layer from the app bundle

    NSString *compositionPath = [[NSBundle mainBundle] pathForResource:@"Clouds" ofType:@"qtz"];

    CALayer *qcLayer = [QCCompositionLayer compositionLayerWithFile:compositionPath];

    [self addSublayer:qcLayer];

    // do some custom GL drawing

    RotatingSquareGLLayer *caGLLayer = [RotatingSquareGLLayer layer];

    caGLLayer.asynchronous = YES;

    [self addSublayer:caGLLayer];

    // play a QuickTime movie from the app bundle

    QTMovie *movie = [QTMovie movieNamed:@"Sample.mov" error:nil];

    QTMovieLayer *qtMovieLayer = [QTMovieLayer layerWithMovie:movie];

    [self addSublayer:qtMovieLayer];

    [movie play];

    return self;

}

- (void)layoutSublayersOfLayer:(CALayer *)layer {

    NSArray *sublayers = layer.sublayers;

    CGRect layerFrame = layer.frame;

    CGFloat width = layerFrame.size.width / [sublayers count];

    CGFloat height = layerFrame.size.height;

    // layout left to right

    CGFloat x = 0;

    for(CALayer *child in sublayers) {

        child.frame = CGRectMake(x, 0, width, height);

        x += width;

    }

}

@end

// rotates a red square when asked to draw

@implementation RotatingSquareGLLayer

// override to draw custom GL content

-(void)drawInCGLContext:(CGLContextObj)glContext

            pixelFormat:(CGLPixelFormatObj)pixelFormat

           forLayerTime:(CFTimeInterval)timeInterval

            displayTime:(const CVTimeStamp *)timeStamp {

    // set the current context

    CGLSetCurrentContext(glContext);

    // draw a single red quad spinning around based on the current time

    GLfloat rotate = timeInterval * 60.0; // 60 degrees per second

    glClear(GL_COLOR_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);

    glPushMatrix();

    glRotatef(rotate, 0.0, 0.0, 1.0);

    glBegin(GL_QUADS);

    glColor3f(1.0, 0.0, 0.0);

    glVertex2f(-0.5, -0.5);

    glVertex2f(-0.5,  0.5);

    glVertex2f( 0.5,  0.5);

    glVertex2f( 0.5, -0.5);

    glEnd();

    glPopMatrix();

    // call super to finalize the drawing - by default all it does is call glFlush()

    [super drawInCGLContext:glContext pixelFormat:pixelFormat forLayerTime:timeInterval displayTime:timeStamp];

}

@end