JPEGView/Source/C/cPixelMap.c

/*********************************************************/
/* This source code copyright (c) 1991-2001, Aaron Giles */
/* See the Read Me file for licensing information.       */
/* Contact email: mac@aarongiles.com                     */
/*********************************************************/

#if THINK_C
#include "THINK.Header"
#elif applec
#pragma load ":Headers:MPW.Header"
#elif __MWERKS__
//#include "MW.Header"
#else
#include "JPEGView.h"
#endif

/*
 * PixelMapAccessor(classWanted, container, containerClass, keyForm, keyData,
 *					resultToken, theRefCon)
 *
 *     Purpose: Finds a pixel map according to the specified keyForm and returns the
 *					corresponding pixel map token
 *      Inputs: classWanted = the element class desired (cPixelMap)
 *				container = token for this element's container
 *				containerClass = class of this element's container (cImage)
 *				keyForm = the search key type
 *				keyData = descriptor containing search key data
 *				resultToken = descriptor containing the resulting token
 *				theRefCon = reference constant
 *     Returns: an OSErr describing the result
 *
 */

pascal OSErr PixelMapAccessor(DescType classWanted, AEDesc *container, 
	DescType containerClass, DescType keyForm, AEDesc *keyData, 
	AEDesc *resultToken, long theRefCon)
{
#if applec
#pragma unused(classWanted, containerClass, theRefCon)
#endif
	ObjectTokenHandle theList = (ObjectTokenHandle)container->dataHandle;
	OSErr theErr = noErr;
	
	if (IsValidForOne(keyForm, keyData)) {
		if ((theErr = HandToHand((Handle *)&theList)) != noErr) return theErr;
	} else return errAENoSuchObject;
	if (!theList || !(*theList)->count || (theErr != noErr)) {
		DisposeHandle((Handle)theList);
		if (theErr == noErr) theErr = errAENoSuchObject;
	} else {
		theErr = AECreateHandleDesc(cPixelMap, (Handle)theList, resultToken);
		DisposeHandle((Handle)theList);
	}
	return theErr;
}

/*
 * PixelPropertyAccessor(classWanted, container, containerClass, keyForm, keyData,
 *					    resultToken, theRefCon)
 *
 *     Purpose: Finds a pixel map property and returns the corresponding property token
 *      Inputs: classWanted = the element class desired (typeProperty)
 *				container = token for this element's container
 *				containerClass = class of this element's container (cFile)
 *				keyForm = the search key type
 *				keyData = descriptor containing search key data
 *				resultToken = descriptor containing the resulting token
 *				theRefCon = reference constant
 *     Returns: an OSErr describing the result
 *
 */

pascal OSErr PixelPropertyAccessor(DescType classWanted, AEDesc *container, 
	DescType containerClass, DescType keyForm, AEDesc *keyData, 
	AEDesc *resultToken, long theRefCon)
{
#if applec
#pragma unused(classWanted, containerClass, theRefCon)
#endif
	ObjectTokenHandle theList = (ObjectTokenHandle)container->dataHandle;
	DescType propertyType;
	OSErr theErr;
	
	if ((keyForm != formPropertyID) || (keyData->descriptorType != typeType))
		return errAECantSupplyType;
	propertyType = *(DescType *)*keyData->dataHandle;
	switch (propertyType) {
		// Non-modifiable properties
		case pBestType:
		case pBounds:
		case pClass:
		case pDefaultType:
		case pPixelDepth:
		case pTransferMode:
			break;
		default:
			return errAEEventNotHandled;
	}
	theErr = HandToHand((Handle *)&theList);
	if (theErr != noErr) return theErr;
	(*theList)->property = propertyType;
	(*theList)->objclass = cPixelMap;
	theErr = AECreateHandleDesc(typeProperty, (Handle)theList, resultToken);
	DisposeHandle((Handle)theList);
	return theErr;
}

/*
 * GetPixelMapData(theWindow, typeWanted, theData)
 *
 *     Purpose: Extracts the data from the pixel map
 *      Inputs: theWindow = the window associated with this object
 *				typeWanted = the type we're asking for
 *				theData = the data we save
 *     Returns: an OSErr describing the result
 *
 */

OSErr GetPixelMapData(WindowPtr theWindow, DescType typeWanted, AEDesc *theData)
{
	if (typeWanted == typeWildCard) typeWanted = typeObjectSpecifier;
	if (typeWanted == typeBest) typeWanted = typeObjectSpecifier;
	if (typeWanted != typeObjectSpecifier) return errAECantSupplyType;
	return MakePixelMapObject(theWindow, theData);
}

/*
 * GetPixelPropertyData(theWindow, theProperty, typeWanted, theData)
 *
 *     Purpose: Extracts the data from the pixel map's properties
 *      Inputs: theWindow = the window associated with this object
 *				theProperty = the property wanted
 *				typeWanted = the type we're asking for
 *				theData = the data we save
 *     Returns: an OSErr describing the result
 *
 */

OSErr GetPixelPropertyData(WindowPtr theWindow, DescType theProperty, DescType typeWanted, 
	AEDesc *theData)
{
	ImageHandle theImage = FindImage(theWindow);
	Boolean theBoolean = false;
	DescType theType;
	AEDesc bestData;
	short theShort;
	OSErr theErr;
	
	if (!theImage) return errAEReadDenied;
	switch (theProperty) {
		case pBestType:
		case pDefaultType:
			theType = typeObjectSpecifier;
			theErr = AECreateDesc(typeType, (void *)&theType, sizeof(DescType), &bestData);
			break;
		case pBounds:
			theErr = AECreateDesc(typeQDRectangle, (void *)&(*theImage)->gworld->portRect, 
					 sizeof(Rect), &bestData);
			break;
		case pClass:
			theType = cPixelMap;
			theErr = AECreateDesc(typeType, (void *)&theType, sizeof(DescType), &bestData);
			break;
		case pPixelDepth:
			theShort = (*GetGWorldPixMap((*theImage)->gworld))->pixelSize;
			theErr = AECreateDesc(typeShortInteger, (void *)&theShort, sizeof(short), &bestData);
			break;
		default:
			return errAETypeError;
	}
	if (theErr != noErr) return theErr;
	if ((bestData.descriptorType == typeWanted) ||
		(typeWanted == typeWildCard) || (typeWanted == typeBest))
		theErr = AEDuplicateDesc(&bestData, theData);
	else theErr = AECoerceDesc(&bestData, typeWanted, theData);
	AEDisposeDesc(&bestData);
	return theErr;
}

/*
 * SetPixelPropertyData(theWindow, theProperty, theData)
 *
 *     Purpose: Sets the data for the pixel map's properties
 *      Inputs: theWindow = the associated window
 *				theProperty = the property wanted
 *				theData = the data to set it to
 *     Returns: an OSErr describing the result
 *
 */

OSErr SetPixelPropertyData(WindowPtr theWindow, DescType theProperty, AEDesc *theData)
{
#if applec
#pragma unused(theData)
#endif
	ImageHandle theImage = FindImage(theWindow);
	OSErr theErr;

	if (!theImage) return errAEWriteDenied;
	switch (theProperty) {
		default:
			theErr = errAEWriteDenied;
			break;
	}
	return theErr;
}

/*
 * MakePixelMapObject(theWindow, theObject)
 *
 *     Purpose: Creates a pixel map object descriptor for the given window
 *      Inputs: theWindow = pointer to the window, or nil for all windows
 *				theObject = pointer to an AEDesc to store the result
 *     Returns: an OSErr describing what went wrong
 *
 */

OSErr MakePixelMapObject(WindowPtr theWindow, AEDesc *theObject)
{
	AEDesc theKey, theContainer;
	long index = kAEFirst;
	OSErr theErr = noErr;
	
	theErr = MakeImageObject(theWindow, &theContainer);
	if (theErr == noErr) {
		theErr = AECreateDesc(typeAbsoluteOrdinal,(void *)&index, sizeof(long), &theKey);
		if (theErr == noErr) {
			theErr = CreateObjSpecifier(cPixelMap, &theContainer, formAbsolutePosition, 
					 &theKey, false, theObject);
			AEDisposeDesc(&theKey);
		}
		AEDisposeDesc(&theContainer);
	}
	return theErr;
}

/*
 * MakePixelPropertyObject(theWindow, theProperty, theObject)
 *
 *     Purpose: Creates a property object descriptor for the given images's property
 *      Inputs: theWindow = pointer to the window, or nil for all windows
 *				theObject = pointer to an AEDesc to store the result
 *     Returns: an OSErr describing what went wrong
 *
 */

OSErr MakePixelPropertyObject(WindowPtr theWindow, DescType theProperty, AEDesc *theObject)
{
	AEDesc theKey, theContainer;
	OSErr theErr = noErr;
	
	theErr = MakePixelMapObject(theWindow, &theContainer);
	if (theErr == noErr) {
		theErr = AECreateDesc(typeType, (void *)&theProperty, sizeof(DescType), &theKey);
		if (theErr == noErr) {
			theErr = CreateObjSpecifier(typeProperty, &theContainer, formPropertyID, 
					 &theKey, false, theObject);
			AEDisposeDesc(&theKey);
		}
		AEDisposeDesc(&theContainer);
	}
	return theErr;
}