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/*******************************************************************************
* Copyright (c) 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Outhink - support for typeFileURL
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.carbon.*;
import org.eclipse.swt.widgets.*;
/**
* The class <code>ImageTransfer</code> provides a platform specific mechanism
* for converting an Image represented as a java <code>ImageData</code> to a
* platform specific representation of the data and vice versa. The
* <code>ImageData</code> contains infomration about the Image. See
* <code>Transfer</code> for additional information.
*
* <p>
* An example of a java <code>Image</code> containing an ImageData is shown
* below:
* </p>
*
* <code><pre>
* Image image = new Image(display, fileName);
* ImageData imgData = image.getImageData();
* </code></pre>
*/
public class ImageTransfer extends ByteArrayTransfer {
static ImageTransfer _instance = new ImageTransfer();
static final String PICT = "PICT"; //$NON-NLS-1$
static final String TIFF = "TIFF"; //$NON-NLS-1$
static final int PICTID = registerType(PICT);
static final int TIFFID = registerType(TIFF);
ImageTransfer() {
}
/**
* Returns the singleton instance of the ImageTransfer class.
*
* @return the singleton instance of the ImageTransfer class
*/
public static ImageTransfer getInstance() {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts an ImageData
* object represented by a java <code>ImageData</code> to a platform
* specific representation. For additional information see
* <code>Transfer#javaToNative</code>.
*
* @param object
* a java <code>ImageData</code>
* @param transferData
* an empty <code>TransferData</code> object; this object will
* be filled in on return with the platform specific format of
* the data
*/
public void javaToNative(Object object, TransferData transferData) {
if (!checkImage(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
transferData.result = -1;
ImageData imgData = (ImageData) object;
Image image = new Image(Display.getCurrent(), imgData);
int handle = image.handle;
int width = OS.CGImageGetWidth(handle);
int height = OS.CGImageGetHeight(handle);
int alphaInfo = OS.CGImageGetAlphaInfo(handle);
int bpr = OS.CGImageGetBytesPerRow(handle);
Rect rect = new Rect();
rect.left = 0;
rect.top = 0;
rect.right = (short) width;
rect.bottom = (short) height;
int[] gWorld = new int[1];
int format = OS.k24RGBPixelFormat;
if (alphaInfo != OS.kCGImageAlphaNoneSkipFirst) {
format = OS.k32ARGBPixelFormat;
}
OS.NewGWorldFromPtr(gWorld, format, rect, 0, 0, 0, image.data, bpr);
int[] curPort = new int[1];
int[] curGWorld = new int[1];
OS.GetGWorld(curPort, curGWorld);
OS.SetGWorld(gWorld[0], curGWorld[0]);
int pictHandle = OS.OpenPicture(rect);
int portBitMap = OS.GetPortBitMapForCopyBits(gWorld[0]);
OS.CopyBits(portBitMap, portBitMap, rect, rect, (short) OS.srcCopy, 0);
OS.ClosePicture();
OS.SetGWorld(curPort[0], curGWorld[0]);
OS.DisposeGWorld(gWorld[0]);
int length = OS.GetHandleSize(pictHandle);
OS.HLock(pictHandle);
int[] buffer = new int[1];
OS.memmove(buffer, pictHandle, 4);
byte[] pictData = new byte[length];
OS.memmove(pictData, buffer[0], length);
OS.HUnlock(pictHandle);
OS.KillPicture(pictHandle);
image.dispose();
transferData.data = new byte[][] { pictData };
transferData.result = OS.noErr;
}
/**
* This implementation of <code>nativeToJava</code> converts a platform
* specific representation of an ImageData <code>ImageData</code>. For
* additional information see <code>Transfer#nativeToJava</code>.
*
* @param transferData
* the platform specific representation of the data to be been
* converted
* @return a java <code>ImageData</code> object if the conversion was
* successful; otherwise null
*/
public Object nativeToJava(TransferData transferData) {
if (!isSupportedType(transferData) || transferData.data == null)
return null;
if (transferData.data.length == 0)
return null;
byte[] dataArr = transferData.data[0];
int size = dataArr.length;
int pictPtr = OS.NewPtr(size);
OS.memmove(pictPtr, dataArr, size);
int dataProvider = OS.CGDataProviderCreateWithData(0, pictPtr, size, 0);
if (dataProvider != 0) {
int pictDataRef = OS.QDPictCreateWithProvider(dataProvider);
// get bounds for the image
CGRect rect = new CGRect();
OS.QDPictGetBounds(pictDataRef, rect);
int width = (int) rect.width;
int height = (int) rect.height;
/* Create the image */
int bpr = width * 4;
int dataSize = height * bpr;
int data = OS.NewPtr(dataSize);
if (data == 0)
SWT.error(SWT.ERROR_NO_HANDLES);
int provider = OS
.CGDataProviderCreateWithData(0, data, dataSize, 0);
if (provider == 0) {
OS.DisposePtr(data);
SWT.error(SWT.ERROR_NO_HANDLES);
}
int colorspace = OS.CGColorSpaceCreateDeviceRGB();
if (colorspace == 0)
SWT.error(SWT.ERROR_NO_HANDLES);
int handle = OS.CGImageCreate(width, height, 8, 32, bpr,
colorspace, OS.kCGImageAlphaNoneSkipFirst, provider, null,
true, 0);
OS.CGDataProviderRelease(provider);
if (handle == 0) {
OS.DisposePtr(data);
SWT.error(SWT.ERROR_NO_HANDLES);
}
int bpc = OS.CGImageGetBitsPerComponent(handle);
int context = OS.CGBitmapContextCreate(data, width, height, bpc,
bpr, colorspace, OS.kCGImageAlphaNoneSkipFirst);
if (context == 0) {
OS.CGImageRelease(handle);
OS.DisposePtr(data);
SWT.error(SWT.ERROR_NO_HANDLES);
}
int status = OS.QDPictDrawToCGContext(context, rect, pictDataRef);
ImageData imgData = null;
if (status == 0) {
Image image = Image.carbon_new(Display.getCurrent(),
SWT.BITMAP, handle, data);
imgData = image.getImageData();
image.dispose();
}
OS.CGContextRelease(context);
OS.QDPictRelease(pictDataRef);
return imgData;
}
return null;
}
protected int[] getTypeIds() {
return new int[] { PICTID };
}
protected String[] getTypeNames() {
return new String[] { PICT };
}
boolean checkImage(Object object) {
if (object == null || !(object instanceof ImageData)) return false;
return true;
}
protected boolean validate(Object object) {
return checkImage(object);
}
}
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