/*

    File:       QDCanvas.m

    Description:    Implements the native method in QDCanvas.java which returns a pointer

                        to a Cocoa view, and the code needed to render frames to a

                        QuickDrawPort.

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*/

#import "QDCanvas.h"

#import "apple_dts_QDCanvas.h"

#import <JavaVM/jawt.h>

#import <JavaVM/jawt_md.h>

#import <Carbon/Carbon.h>

@interface QDCanvas( Private )

-(void)setupDecompressSequenceWithFrame:(void *)data ofSize:(int)size;

-(void)decompressFrame:(void *)data ofSize:(int)size;

-(void)endDecompressionSequence;

@end

/* NSAppKitVersionNumber10_3 isn't defined in the 10.3 headers */

#ifndef NSAppKitVersionNumber10_3

#define NSAppKitVersionNumber10_3 743

#endif

@implementation QDCanvas

-(id)init

{

    [super init];

    imageDescription = NULL;

    renderSequenceID = NULL;

    return self;

}

/* Set or Re-Set the image description of the data to be rendered */

-(void)setImageDescription:(ImageDescriptionHandle) description

{

    if(description == NULL)

        return;

    /* Just in case we are in the middle of a decompression sequence */

    [self endDecompressionSequence];

    /* Make a copy of the ImageDescription and lock the handle */

    imageDescription = description;

    HandToHand((Handle*)&imageDescription);

    HLock((Handle)imageDescription);

}

-(void)render:(void *)data ofSize:(int)size

{

    /* First time though we will need to setup the decompression sequence */

    if(renderSequenceID == NULL)

        [self setupDecompressSequenceWithFrame:data ofSize:size];

    else /* Already setup, render the data */

        [self decompressFrame:data ofSize:size];

}

-(void)decompressFrame:(void *)data ofSize:(int)size

{

    OSErr   error = noErr;

    Rect    srcRect;    // rect we are copying from

    Rect    dstRect;    // rect we are copying to

    ImageDescriptionPtr descr_ptr;

    MatrixRecord    matrix;

    GWorldPtr       port;

    if(imageDescription == NULL)

        return;

    /* A Bug in NSQuickDrawView (Fixed in 10.3) prevents us from using lockFocusIfCanDraw */

    /* with a NSQuickDrawView, but if the focus is not locked then the QuickDraw port will */

    /* not be properly setup. */

    if(NSAppKitVersionNumber >= NSAppKitVersionNumber10_3) {

        if(![self lockFocusIfCanDraw])

            return;

    } else {  // If we aren't in 10.3 or later then use the lockFocus, and canDraw API's to work

              // around the issue.

        [self lockFocus];

        if(![self canDraw]) {

            [self unlockFocus];

            return;

        }

    }

    /*the Image description has the source size */

    descr_ptr = *imageDescription;

    srcRect.top     = 0;

    srcRect.left    = 0;

    srcRect.bottom  = descr_ptr->height;

    srcRect.right   = descr_ptr->width;

    /* The port we are rendering to has the destination size */

    port = [self qdPort];

    GetPortBounds(port,&dstRect);

    /* In case the Canvas has changed size, calcuate a new */

    /* Transformation matrix for the new size */

    RectMatrix (&matrix, &srcRect, &dstRect );

    error = SetDSequenceMatrix(renderSequenceID,&matrix);

    if(error == noErr) {

        /* If everything is still ok, then decompress the frame */

        error = DecompressSequenceFrameWhen(renderSequenceID, data, size,

                                0, NULL, NULL, NULL);

        /* Mark the Region as Dirty so that it is updated with the next flush*/

        /* Previous versions of this sample used QDFlushPort, which works fine if their */

        /* is only one video stream being displayed, but with multiple video streams each trying to display */

        /* at 30fps, performance will suffer.  Using QDSetDirtyRegion allows the system to group all */

        /* of the flushes together into a single flush, reducing CPU load and allowing mulltiple streams */

        /* to render to the screen at the same time vs one at a time. */

        QDSetDirtyRegion(port, NULL);

        if(error != 0)

            printf("Error in render sequence, %d\n",error);

    }

        else

            printf("Error SetDSequenceMatrix %d\n",error);

    [self unlockFocus];

}

-(void)setupDecompressSequenceWithFrame:(void *)data ofSize:(int)size

{

    OSErr   error;

    Rect    srcRect;    // rect we are copying from

    GWorldPtr   port;

    /* If an image Description is not yet set then we cant setup the */

    /* decompression sequence.  Maybe next time though. */

    if(imageDescription == NULL)

        return;

    /* A Bug in NSQuickDrawView (Fixed in 10.3) prevents us from using lockFocusIfCanDraw */

    /* with a NSQuickDrawView, but if the focus is not locked then the QuickDraw port will */

    /* not be properly setup. */

    if(NSAppKitVersionNumber >= NSAppKitVersionNumber10_3) {

        if(![self lockFocusIfCanDraw])

            return;

    } else {  // If we aren't in 10.3 or later then use the lockFocus, and canDraw API's to work

              // around the issue.

        [self lockFocus];

        if(![self canDraw]) {

            [self unlockFocus];

            return;

        }

    }

    /* Get the port we are rendering to */

    port = [self qdPort];

    /* Create the source rect from the image description */

    srcRect.top     = 0;

    srcRect.left    = 0;

    srcRect.bottom  = (*imageDescription)->height;

    srcRect.right   = (*imageDescription)->width;

    /* Begin the image decompression sequence */

    error = DecompressSequenceBeginS(&renderSequenceID, imageDescription, 

                        data, size,

                        port, NULL, &srcRect,

                        NULL, ditherCopy, NULL, 0, codecNormalQuality,

                        (CompressorComponent) bestSpeedCodec);

    if(error != 0) {

        /* If their is an error setting up the image decompression sequence */

        /* make sure the renderSequenceID so we will try to start it again */ 

        printf("Error setting up the render sequence, %d\n",error);

        renderSequenceID = 0;

        }

    [self unlockFocus];

}

/* Clean up after ourselves */

-(void)endDecompressionSequence

{

    if(renderSequenceID != NULL)

        CDSequenceEnd(renderSequenceID);

    renderSequenceID = NULL;

}

/* Make sure the decompression sequence is ended when this object is released */

- (void)dealloc

{

    [self endDecompressionSequence];

    if(imageDescription != NULL)

        DisposeHandle((Handle)imageDescription);

    imageDescription = NULL;

}

@end

/*

 * Class:     apple_dts_QDCanvas

 * Method:    _createNSView

 * Signature: ()I

 */

 /* Creates the view.  This is called by the com.apple.eawt.CocoaComponent (the Java parrent) */

 /* to get this Canvas's view */

JNIEXPORT jint JNICALL Java_apple_dts_QDCanvas__1createNSView (JNIEnv *env, jobject canvas) {

      QDCanvas *cocoaCanvas = nil;

NS_DURING;

    // Here we create our custom NSView

    cocoaCanvas = [[QDCanvas alloc] init];

    // We can call any api on it from the calling thread, so long as this does not block or

    // need to message the AppKit's main thread.  This is most always safe on an NSView which

    // has not yet been added to the view hierarchy.

NS_HANDLER;

    fprintf(stderr,"ERROR : Failed to create QDCanvas\n");

    NS_VALUERETURN(0, jlong);

NS_ENDHANDLER;

    // Return a pointer to the custom NSView (the view must have a retain count of at least 1)

    return (jint) cocoaCanvas;

  }