Developer CD Series 1996 August: Tool Chest/Apple_Developer_Group_August_1996_Tool_Chest.iso/Sample Code/Snippets/QuickDraw/Thumbnail Test/PictInfoTest.c

C/C++ Source or Header | 1994-10-28 | 12.0 KB | 493 lines | [TEXT/KAHL]

// Sample to demonstrate using the Picture Utilities Package
//
// The guts of this is in the window creation function: DoCreateWindow( PicHandle thePicture )
//
// DoCreateWindow is passed a picture handle and if the global gUsePictPalette is set it
// will use the pict utils package (PUP) to get the color table stored in the pict.  You could
// this source to sample direct color images, but to keep things as clear as possible this
// application only deals with 8 bit images.
//
// We use the PUP to get the color table for the image.  This is passed into NewGWorld and it
// is also used to create a palette that is attached to the window.
//
// Note that we use PUP to sample the image that was stored in the file.  We interrogate a
// PicHandle read directly from the file.  There are also routines for sampling PixMaps,
// but dont forget that if you are in an indexed color environment, and you sample a PixMap,
// if you didnt set up the color environment when your first created the PixMap, the colors
// may not be as you expect.
//
// To see an example of this there are two 8-bit images included with this snippet.
// One is a spectral ramp, the other a green/brow ramp.  Both have approx 120 or so colors.
// to see an example of what PUP may report if you didnt set the colors for a window up
// properly before displaying open one of the files with the "use picture palette" item
// from the palette menu toggled off.
//
// in this case it will use the "wrong" set of colors to try to draw the image (it just uses
// what ever the default system color table is).  If you get PUP to sample (by toggling on
// the "use picture palette" item from the palette menu the picture is rendered correctly.
//
//
// Nick Thompson - May 6th 1994

/* Constant Declarations */
#include <menus.h>
#include <PictUtil.h>
#include <QDOffScreen.h>


#define    WWIDTH        470
#define    WHEIGHT        330

#define WLEFT        (((screenBits.bounds.right - screenBits.bounds.left) - WWIDTH) / 2)
#define WTOP        (((screenBits.bounds.bottom - screenBits.bounds.top) - WHEIGHT) / 2)

#define HiWrd(aLong)    (((aLong) >> 16) & 0xFFFF)
#define LoWrd(aLong)    ((aLong) & 0xFFFF)



enum {
    mApple = 128,
    mFile,
    mPalette,
    mTest
} ;

enum {
    iAbout = 1
} ;
enum {
    iOpen = 1,
    iClose,
    iUnused1,
    iQuit = 4
} ;

enum {
    iUsePictPalette = 1
} ;

static Boolean gQuitFlag = false ;
 Point gStaggerPos = {50,50} ;
static Boolean gUsePictPalette = true ;

// function prototypes

void InitToolbox( void ) ;
void MainEventLoop( void ) ;
void HandleKeyPress(EventRecord *event) ;
void HandleOSEvent(EventRecord *event) ;
void HandleMenuCommand(long menuResult) ;
PicHandle DoReadPICT( short theRef, OSErr *theErr ) ;
OSErr DoCreateWindow( PicHandle thePicture ) ;
void AdjustMenus( void ) ;


const RGBColor    kRGBBlack = {0, 0, 0};
const RGBColor    kRGBWhite = {0xFFFF, 0xFFFF, 0xFFFF};


main()
{
    InitToolbox() ;

    MainEventLoop();
}



void InitToolbox()
{
    OSErr         retCode;
    long         gestResponse;
    Handle        menuBar = nil;
    EventRecord event;
    short        count;


    InitGraf((Ptr) &qd.thePort);
    InitFonts();
    InitWindows();
    InitMenus();
    TEInit();
    InitDialogs(0L);
    InitCursor();

    // initialize application globals

    gQuitFlag = false;


    menuBar = GetNewMBar(128);                // Read menus into menu bar, MBAR res id is 128

    if ( menuBar == nil )
         ExitToShell();                        // if we dont have it then quit - your app
                                             // needs a dialog here

    SetMenuBar(menuBar);                    // Install menus
    DisposHandle(menuBar);

    AddResMenu(GetMHandle(mApple), 'DRVR');    // Add DA names to Apple menu, ID 128

    DrawMenuBar();
}


void MainEventLoop()
{
    EventRecord     event;
    WindowPtr       window;
    short           thePart;
    Rect            screenRect;
    Point            aPoint = {100, 100};
    GWorldPtr        theNewWorld ;
    PixMapHandle    offPixMap ;
    GrafPtr            oldPort ;

    while( !gQuitFlag )
    {
        if (WaitNextEvent( everyEvent, &event, 0, nil ))
        {
            AdjustMenus() ;

            switch (event.what) {
                case mouseDown:

                    thePart = FindWindow( event.where, &window );

                    switch( thePart ) {
                        case inMenuBar:
                            HandleMenuCommand(MenuSelect(event.where));
                            break;

                        case inDrag:

                            screenRect = (**GetGrayRgn()).rgnBBox;
                            DragWindow( window, event.where, &screenRect );
                            break ;

                        case inContent:

                            if (window != FrontWindow())
                                SelectWindow( window );
                            break ;

                        case inGoAway:
                            if (TrackGoAway( window, event.where )) {
                                DisposeWindow ( window );
                            }
                            break ;

                        default:
                            break ;
                    }
                    break ;


                case updateEvt:

                    window = (WindowPtr)event.message;
                    GetPort(&oldPort ) ;
                    SetPort( window );

                    BeginUpdate( window );

                    // get the GWorld from the window refcon
                    theNewWorld = (GWorldPtr)GetWRefCon ( window );
                    offPixMap = GetGWorldPixMap( theNewWorld ) ;
                    (void) LockPixels( offPixMap ) ;
                    CopyBits( &((GrafPtr)theNewWorld)->portBits,
                              &window->portBits,
                              &window->portRect,
                              &window->portRect,
                              srcCopy,
                              nil ) ;
                    (void) UnlockPixels( offPixMap ) ;

                    EndUpdate( window );
                    SetPort( oldPort ) ;
                    break ;

                case keyDown:
                case autoKey:
                    HandleKeyPress(&event);
                    break;

                case diskEvt:
                    if ( HiWrd(event.message) != noErr )
                        (void) DIBadMount(aPoint, event.message);
                    break;

                case osEvt:
                case activateEvt:
                    break;


            }
        }
    }
}


void HandleKeyPress(EventRecord *event)
{
    char    key;

    key = event->message & charCodeMask;

    // just check to see if we want to quit...

    if ( event->modifiers & cmdKey ) {        /* Command key down? */
        HandleMenuCommand(MenuKey(key));
    }
}


void HandleMenuCommand(long menuResult)
{
    short        menuID;
    short        menuItem;
    Str255        daName;
    DialogPtr    theDialog ;
    short        itemHit ;
    SFTypeList    myTypes = { 'PICT' } ;
    FSSpec        theFSSpec ;
    PicHandle    thePicture ;
    OSErr        err ;
    short        theRef ;

    StandardFileReply    theSFReply ;

    menuID = HiWrd(menuResult);
    menuItem = LoWrd(menuResult);
    switch ( menuID ) {
        case mApple:
            switch ( menuItem ) {
                case iAbout:
                    theDialog = GetNewDialog ( 128, nil, (WindowPtr)-1 );
                    do {
                        ModalDialog ( nil, &itemHit );
                    } while( itemHit != ok ) ;
                    DisposDialog ( theDialog );
                    break;

                default:
                    GetItem(GetMHandle(mApple), menuItem, daName);
                    (void) OpenDeskAcc(daName);
                    break;
            }
            break;
        case mFile:
            switch ( menuItem ) {
                case iOpen:
                    // Get the file name to open
                    StandardGetFile( nil, 1, myTypes, &theSFReply ) ;

                    // did the user cancel?
                    if(!theSFReply.sfGood)
                        break ;

                    // open the file
                    err = FSpOpenDF( &theSFReply.sfFile, fsRdPerm, &theRef ) ;

                    if( err != noErr )
                        break ;     // should handle this properly

                    thePicture = DoReadPICT( theRef, &err ) ;

                    if( err != noErr )
                        break ;     // should handle this properly

                    // display the contents
                    err = DoCreateWindow( thePicture ) ;

                    break ;

                case iClose:
                    DisposeWindow ( FrontWindow() );
                    break ;
                case iQuit:
                    gQuitFlag = true;
                    break;
            }
            break;

        case mPalette:
            switch ( menuItem ) {
                case iUsePictPalette :
                    // toggle the check mark and the global boolean
                    gUsePictPalette = !gUsePictPalette ;
                    CheckItem ( GetMHandle ( mPalette ), iUsePictPalette, gUsePictPalette );
                    break ;
            }
            break ;

        case mTest:

//--------------------------- T E S T   R O U T I N E ---------------------------------
            if( menuItem == 1 ) {
                // get some of the screen
                void ShrinkToBWPict( WindowPtr theWindow ) ;        // prototype

                // because I have multiple monitors and I wanted to test on them
                // I set up the area below, you may want something rather different
                // YOU WILL PROBABLY NEED TO CHANGE THIS

                Rect area = { 0, -50, 200, 200 } ;                // area to save

                ShrinkToBWPict( FrontWindow() ) ;


//--------------------------- T E S T   R O U T I N E ---------------------------------

            }
            break;

    }
    HiliteMenu(0);        // Unhighlight whatever MenuSelect or MenuKey hilited
}

void AdjustMenus( void )
{
    WindowPtr    theWindow ;
    theWindow = FrontWindow() ;
    if( theWindow != nil ) {
        EnableItem ( GetMHandle ( mFile ), iClose );
        EnableItem ( GetMHandle ( mTest ), 0 );    // <== 0 is entire menu
    }
    else {
        DisableItem ( GetMHandle ( mFile ), iClose );
        DisableItem ( GetMHandle ( mTest ), 0 );    // <== 0 is entire menu
    }
    // make sure the check marks are correct
    CheckItem ( GetMHandle ( mPalette ), iUsePictPalette, gUsePictPalette );
}

PicHandle DoReadPICT( short theRef, OSErr *theErr )
{
    long        theFileSize ;
    PicHandle    thePicture ;

    // pict files have a 512 byte header at the front - we dont care about this
    // we can find the size of the pict by subtracting 512 bytes from the length
    // of the file.  We then want to resize the handle to that and read the data
    // into the resized handle.

    if(( *theErr = GetEOF( theRef, &theFileSize )) != noErr ) {
        FSClose( theRef ) ;
        return nil ;
    }

    if(( *theErr = SetFPos( theRef, fsFromStart, 512)) != noErr ) {
        FSClose( theRef ) ;
        return nil ;
    }

    theFileSize -= 512 ;

    thePicture = (PicHandle)NewHandle( theFileSize ) ;
    if( thePicture == nil ) {
        FSClose( theRef ) ;
        *theErr = MemError() ;
        return nil ;         // what ever the mem manager error was
    }

    HLock( (Handle)thePicture ) ;
    *theErr = FSRead( theRef, &theFileSize, (Ptr)*thePicture ) ;
    HUnlock(  (Handle)thePicture ) ;

    if( *theErr != noErr ) {
        FSClose( theRef ) ;
        return nil ;
    }

    return thePicture ;
}

OSErr DoCreateWindow( PicHandle thePicture )
{

    Rect        theRect ;
    OSErr        theErr ;
    GWorldPtr    theNewWorld ;
    CGrafPtr    savedPort ;
    GWorldPtr    savedGWorld ;
    WindowPtr    theWindow ;
    GDHandle    oldDevice ;

    PictInfo        thePictInfo ;
    PaletteHandle    thePictPalette = nil ;
    CTabHandle        thePictCTab = nil ;

    // make an offscreen environment and image the pict into this
    // Make a window the size of the pict
    // store a reference to the GWorld in the Refcon of the window
    // invalidate the window content area.

    theRect = (**thePicture).picFrame;

    // to we want to attempt to sample the picture...
    if( gUsePictPalette ) {

        // use the picture utilities to get the palette for the window
        theErr = GetPictInfo( thePicture, &thePictInfo, returnColorTable, 256, systemMethod, 0) ;

        // set up the palette and color table for later use
        thePictPalette = NewPalette( 256, thePictInfo.theColorTable, pmTolerant, 0x1000 ) ;
        thePictCTab = thePictInfo.theColorTable ;
    }

    // we are only dealing with eight bit images here
    // hence the requirement for the picture utils package to
    // return 256 colors, and we will create a gWorld 8 bits deep

    theErr = NewGWorld( &theNewWorld, 8, &theRect, thePictCTab, nil, 0L ) ;

    if( theErr != noErr )
        return theErr ;

    // save the world
    GetGWorld( &savedPort, &oldDevice ) ;
    SetGWorld( theNewWorld, nil ) ;


    RGBForeColor( &kRGBBlack ) ;        // ensure the fg and bg colors are
    RGBBackColor( &kRGBWhite ) ;        // as anticipated
    EraseRect( &theRect ) ;                // clear the area for the pict
    PenMode( srcCopy ) ;                // ensure the t/f mode is as expected

SetOrigin( theRect.left, theRect.top );


    // render the image into the offscreen buffer
    DrawPicture( thePicture, &theRect ) ;
SetOrigin( 0, 0 );

    SetGWorld( savedPort, oldDevice ) ;

    // create the window
    OffsetRect( &theRect, gStaggerPos.h, gStaggerPos.v) ;
    gStaggerPos.h += 16 ;
    gStaggerPos.v += 16 ;        // heh - should roll these around, but you wont
                                // create more than a couple of windows, will you  :-)

    theWindow  = NewCWindow( nil, &theRect, "\pplayTime", true,
                                documentProc, (WindowPtr)-1, true, (long)theNewWorld );

    // and if we set up the palette earlier assign it to the window
    if( thePictPalette != nil ) {
        SetPalette ( theWindow, thePictPalette, true );
    }

    ActivatePalette ( theWindow );

    // make sure it is visible
    ShowWindow( theWindow ) ;

    SetGWorld( (CGrafPtr)theWindow, nil ) ;

    // invalidate the content region of the window - we don't do any drawing to it here.
    InvalRect ( &theRect );

    SetGWorld( savedPort, oldDevice ) ;
}