Writing a Qt Image Plugin, 8Bit Indexed Images

I decided to write something on this since I just broke my ass to get this working. I am converting BGR555 4bpp SNES images to 8bpp RGB24 indexed for my QT Program. There are a number of things you need to simply "try"/"know" before getting the EFFING thing to WORK! So, since I've already done the ass-breaking. Let me show you..

STEP 1) Learn how to write a QT Image plugin.. http://doc.qt.nokia.com/qq/qq17-imageio.html
Simply edit the downloadable code so that the read/write functions reflect what you want to do...

Here are the finnicky things you need to know for 8-bit indexed QImages..

After creating a QImage img, you MUST img.setColorCount( int n), or your results will be CORRUPT. setColorCount sets the amount of colors to index with.
 Note: you don't have to actually set any colors at this point...

You are now free to index pixels with setPixel(x,y,colorindex);


random ass note: if you want to get the pixel index, use img.pixelIndex(x,y);
random article, hopefully your frustration now = 0 :)

SNES Memory Mapping..Address Decoding

Super Mario World

Address Decoder 74LS139 Spec. (two independent decoders in chip) 

                            __  __ 
                       1G  |01\/16| +5V 
                       1A  |02  15| 2G 
                       1B  |03  14| 2A 
                       1Y0 |04  13| 2B 
                       1Y1 |05  12| 2Y0 
                       1Y2 |06  11| 2Y1 
                       1Y3 |07  10| 2Y2 
                       GND |08  09| 2Y3 
                            ------ 

-------------------------------------- 
|      INPUTS      |     OUTPUTS     | 
|  ENABLE | SELECT |                 | 
|    G    | A   B  | Y0  Y1  Y2  Y3  | 
-------------------------------------- 
|    H    | X   X  | H   H   H   H   | 
|    L    | L   L  | L   H   H   H   | 
|    L    | H   L  | H   L   H   H   | 
|    L    | L   H  | H   H   L   H   | 
|    L    | H   H  | H   H   H   L   | 
-------------------------------------- 
Datasheet - 74LS139

USB->LPT and SNES Copiers....

God... I prototyped this -> http://www-user.tu-chemnitz.de/~heha/bastelecke/Rund%20um%20den%20PC/USB2LPT/ul-khs.htm .. didn't work, ended hacking the hell out of a win2000 install for compatibility.. still doesnt work... >_<

I'm doing this so I can get my SNES Copiers to work!!! They use old-ass parallel ports and my laptop does not have that shiz.

So.. I'm beginning to abandon this project.. Besides, the LPT->USB would have been MAD SLOW....

So now something dawned on me..... I saw this

Look kind of familiar??? Someone made a TSOP adapter similar to my own, except this is perfect for dropping into a SNES DIP36 ROM.

Well,  since I already ordered 3 PCBS of my adaptor, I am going to plan on using another 1 of them for this. And hopefully, I can even use my GB cart flasher to flash these chips!!

Future work

---------------------

1) Get a SNES Cart connector. Find an eagle Board layout that uses it..

2) Route GB Cart connector to SNES connector. Use a gameboy Cart and wire all pads -> SNES