//////////

//

//  File:       QTMultiImage.c

//

//  Contains:   Code for displaying multiple images contained in a single image file.

//

//  Written by: Tim Monroe

//

//  Copyright:  © 1998 by Apple Computer, Inc., all rights reserved.

//

//  Change History (most recent first):

//

//     <3>      03/21/00    rtm     changed QTMulti_ShowAllImagesInFile to use FSSpec parameter

//     <2>      10/30/98    rtm     cleaned up code; verified on both Mac and Windows

//     <1>      09/30/98    rtm     first file

//     

//  This file contains code that illustrates how to determine whether an image file contains 

//  more than one image and how to display any of those images. This is useful for working with

//  FlashPix files (which contain multiple resolutions of an image) and PhotoShop files (which

//  store layers as separate images), among others.

//

//  The key new functions to use are GraphicsImportGetImageCount and GraphicsImportSetImageIndex.

//  The rest of the image-handling is done using graphics importer routines that have previously

//  been available.

//

//  This file defines a single function that prompts the user for an image file, determines

//  how many images are contained in that file, and then displays each such image for a short

//  period of time (2 seconds).

//

//////////

#include "QTMultiImage.h"

WindowPtr                       gImageWindow = NULL;    // the window we display the image in

GraphicsImportComponent         gImporter = NULL;

//////////

//

// QTMulti_ShowAllImagesInFile

// Display all the images contained in the specified image file.

//

//////////

OSErr QTMulti_ShowAllImagesInFile (FSSpecPtr theFSSpecPtr)

{

    Rect                        myRect;

    unsigned long               myCount, myIndex, myIgnore;

    OSErr                       myErr = noErr;

    if (theFSSpecPtr == NULL)

        goto bail;

    //////////

    //

    // get a graphics importer for the image file and determine how many images are contained in it

    //

    //////////

    myErr = GetGraphicsImporterForFile(theFSSpecPtr, &gImporter);

    if (myErr != noErr)

        goto bail;

    myErr = GraphicsImportGetImageCount(gImporter, &myCount);

    if (myErr != noErr)

        goto bail;

    //////////

    //

    // loop thru all images the image file, drawing each into a window

    //

    //////////

    for (myIndex = 1; myIndex <= myCount; myIndex++) {

        // set the image index we want to display

        myErr = GraphicsImportSetImageIndex(gImporter, myIndex);

        if (myErr != noErr)

            goto bail;

        // determine the natural size of the image

        myErr = GraphicsImportGetNaturalBounds(gImporter, &myRect);

        if (myErr != noErr)

            goto bail;

        MacOffsetRect(&myRect, 50, 50);

        // create a window to display the image in

        gImageWindow = NewCWindow(NULL, &myRect, theFSSpecPtr->name, true, movableDBoxProc, (WindowPtr)-1L, true, 0);

        if (gImageWindow == NULL)

            goto bail;

        // set the current port and draw

        GraphicsImportSetGWorld(gImporter, (CGrafPtr)gImageWindow, NULL);       

        GraphicsImportDraw(gImporter);

        Delay(kImageDisplayTime, &myIgnore);

        DisposeWindow(gImageWindow);

    }

bail:

    if (myErr != noErr)

        if (gImporter != NULL)

            CloseComponent(gImporter);

    return(myErr);

}