Using QD PicHandle at iMac...

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Fonarix - 29 Aug 2007 13:34 GMT

Greetings!
I've got a problem on porting old App to iMac.
Currently, i can't get code for extracting RGB data from PicHandle.
For Skinning my application (I using background picture and foreground
picture, in foreground not used pixels - same as [0,0] of pict, all
removed by background ) is there some code for resolving this issue?
At PPC all works fine. I am afraid, that porting to Quartz 2D is very
difficult.

Thanks!

Reply to this Message

David Phillip Oster - 29 Aug 2007 15:19 GMT

> Greetings!
> I've got a problem on porting old App to iMac.
[quoted text clipped - 6 lines]
>
> Thanks!

You say: "At PPC all works fine".

QD Pichandles can also be made to work on Intel Macintoshes. See for
http://developer.apple.com/documentation/MacOSX/Conceptual/universal_bina
ry/universal_binary_tips/chapter_5_section_30.html more details. It is
part of this larger document:
http://developer.apple.com/documentation/MacOSX/Conceptual/universal_bina
ry/

Which in turn is part of this: http://developer.apple.com/transition/

A QD Pichandle can be transformed into a file in PICT format (write 512
bytes of zeros, then the Pichandle data.) From there, you can use a
graphics editor to read in the file, and write it out as a .PNG file.
.PNGs can have alpha channels, and Cocoa knows how to load and draw them.

Reply to this Message

Fonarix - 29 Aug 2007 16:05 GMT

> In article <1188390889.757895.131...@19g2000hsx.googlegroups.com>,
>
[quoted text clipped - 22 lines]
> graphics editor to read in the file, and write it out as a .PNG file.
> .PNGs can have alpha channels, and Cocoa knows how to load and draw them.

I've found that QDGetPictureBounds works sometime with bugs (values
scaled on 255 (8-bit) )
This code can resolve this problem:

        hBitmap    = (long)GetPicture(ABS(PictId));
        Rect rframe;
        QDGetPictureBounds((PicHandle)hBitmap, &rframe );
        rframe.right = MIN((**(PicHandle)hBitmap).picFrame.right,
rframe.right);
        rframe.bottom = MIN((**(PicHandle)hBitmap).picFrame.bottom,
rframe.bottom);
        (**(PicHandle)hBitmap).picFrame = rframe;

And... How can I get data from PicHandle on iMac? Currently I'm using
this code:

    PixMapHandle    px;
    GWorldPtr     pGWorld = PictGWorld(*pictHandle,&rect,&w,&h);

    px = GetGWorldPixMap(pGWorld); //

    UInt8    *baseAddress = (UInt8 *)GetPixBaseAddr(px);    //
(**px).baseAddr;//
    long    rowBytes2 = (*px)->rowBytes;

    rowBytes2 = GetPixRowBytes(px);

    LockPixels(px);

    ct = 0;
    for (long j=0; j < h; j++)
    for (long i=0; i < w; i++){

//        GetCPixel(i, j, &cPix); // Doesn't work on iMac
//        R[ct] = (SHORT8)((DFLOAT) cPix.red /(DFLOAT)0xFFFF*255.0);
//        G[ct] = (SHORT8)((DFLOAT) cPix.green/(DFLOAT)0xFFFF*255.0);
//        B[ct] = (SHORT8)((DFLOAT) cPix.blue /(DFLOAT)0xFFFF*255.0);
        UInt8 *pixelAddr = baseAddress + (j)*rowBytes2 + 4*(i);

// And this alternative method, doesn't work too on iMac
        R[ct] = (*(SHORT8*)&pixelAddr[1]) ;
        G[ct] = (*(SHORT8*)&pixelAddr[2]) ;
        B[ct] = (*(SHORT8*)&pixelAddr[3]) ;
        ct++;
    }
    UnlockPixels(px);

At iMac I have just rectangle filled with some color...

Reply to this Message

David Phillip Oster - 29 Aug 2007 16:45 GMT

> I've found that QDGetPictureBounds works sometime with bugs (values
> scaled on 255 (8-bit) )
[quoted text clipped - 8 lines]
> rframe.bottom);
> (**(PicHandle)hBitmap).picFrame = rframe;

I find it hard to believe that QDGetPictureBounds() only works some of
the time. I'd take a good hard look at your program to see if something
else wasn't pre-swapping some of your resources.

> And... How can I get data from PicHandle on iMac? Currently I'm using
> this code:
> ...

Why are you trying to read the result of drawing the PICT one pixel at a
time? Since you are eventually going to be drawing, see:

http://developer.apple.com/documentation/Carbon/Conceptual/QuickDrawToQua
rtz2D/

and if you really do need the numeric values of the pixel, the following
reference should help:

http://developer.apple.com/documentation/MacOSX/Conceptual/universal_bina
ry/universal_binary_tips/chapter_5_section_27.html

See also:
http://developer.apple.com/documentation/MacOSX/Conceptual/universal_bina
ry/universal_binary_tips/chapter_5_section_29.html

Reply to this Message

Fonarix - 31 Aug 2007 09:27 GMT

> In article <1188399902.647946.97...@50g2000hsm.googlegroups.com>,
>
[quoted text clipped - 10 lines]
> > rframe.bottom);
> > (**(PicHandle)hBitmap).picFrame = rframe;

QDGetPictureBounds, yes - one of the problem - in returned pict frame
some values scalled at 256.
Pre-swapping? I have to swap some how resources? Even they are
compiled at iMac machine???

> I find it hard to believe that QDGetPictureBounds() only works some of
> the time. I'd take a good hard look at your program to see if something
[quoted text clipped - 3 lines]
> > this code:
> > ...

For this skining model, I have to read foreground picture, get pixel
at [0,0] coord, and replace this values in foreground picture with
background picture...

> Why are you trying to read the result of drawing the PICT one pixel at a
> time? Since you are eventually going to be drawing, see:
[quoted text clipped - 10 lines]
> See also:http://developer.apple.com/documentation/MacOSX/Conceptual/universal_...
> ry/universal_binary_tips/chapter_5_section_29.html

Thanks for your reply!!!

Reply to this Message

Fonarix - 29 Aug 2007 16:06 GMT

> In article <1188390889.757895.131...@19g2000hsx.googlegroups.com>,
>
[quoted text clipped - 34 lines]
> graphics editor to read in the file, and write it out as a .PNG file.
> .PNGs can have alpha channels, and Cocoa knows how to load and draw them.

Reply to this Message

Mac Forum / Programming / Mac Programming / August 2007

Using QD PicHandle at iMac...