New image library

[raymond]

Bit depth for JPG is 8 bits max. YUVs are computed from RGBs, the max Y being 0FFh. When computing the DCT, the max positive value for Y becomes 7Fh and the maximum DC which can result is 8*7Fh=3F8h. Dwords are thus sufficient.

Raymond

[Vortex]

Hi Raymond,

Have the load from memory version of your image functions?

[raymond]

Hi Raymond,

Have the load from memory version of your image functions?

Do you mean AFTER loading an image file from external storage to memory?? If so, why would you have loaded it in the first place?

Raymond

[Vortex]

Hi Raymond,

You can always embed your images into your executable with the help of tools like Hutch's fda.exe
( or put them in the resource section ) This is why I asked about the load from memory versions.

[raymond]

Thanks Vortex. I'll take that into consideration when I eventually get back into that project.

Personally, I would not embed image files into an executable, neither directly nor along with resources.

Raymond

[Vortex]

Hi Raymond,

I understand your point of view. Sometimes, embedding small sized images into an executable can be a usefull method. Thanks for your consideration.

[taianmonkey]

Is Wrote by this?
_Monkeycd_Jpg_Paint_Proc  proc  hWndDC:DWORD , hDI:DIBINFO
    LOCAL @hOld:DWORD
    LOCAL @memDC :DWORD

    invoke CreateCompatibleDC , hWndDC
    mov @memDC, eax   
   
   .if hDI != 0
        mov    eax,hDI
        mov    ebx,eax
        invoke SelectObject , @memDC , [eax].DIBINFO.hDIB
        mov    @hOld , eax
        mov    eax,ebx
        mov    ecx,[eax].DIBINFO.bmih.bmiHeader.biWidth
        mov    edx,[eax].DIBINFO.bmih.bmiHeader.biHeight
        test   edx,edx
        jns    @F
        neg    edx
    @@:
        invoke BitBlt,hWndDC,0,0,ecx,edx,@memDC,0,0,SRCCOPY   
        invoke SelectObject,hWndDC,@hOld
        invoke DeleteDC,@memDC
   .endif
    ret
_Monkeycd_Jpg_Paint_Proc  endp

[raymond]

I have to assume that you would already have called the loadJPG function from the library. The function creates a global variable having the DIBINFO struc format as given in the .inc file, and returns the ADDRESS of that global variable.

_Monkeycd_Jpg_Paint_Proc  proc  hWndDC:DWORD , hDI:DIBINFO

You should thus be passing the address of that global variable to your proc, such that hDI should only be a DWORD in the above description of parameters. In addition,
SelectObject,hWndDC,@hOld should be SelectObject,@memDC,@hOld

Apart from that, the remainder of your code looks OK to display the image.

Don't forget to delete the hDIB object once you are finished with it

Raymond

[caraveiro]

Hi Raymond!


It's any chance to include a LoadJPGFromMemory function?

You see, often I need to show a JPG's file projected/loaded into Memory buffer, and it will be easier than figthing with .tmp files.


Thank you in advance!

[raymond]

It's any chance to include a LoadJPGFromMemory function?

You probably got the original version of the library. It was expanded last summer at the request of others to include loading JPEG (and GIF files) from memory. You can download the latest version from this thread:

http://www.masm32.com/board/index.php?topic=9538.0

Be sure to read the thread to understand the required parameters of the newer functions. They are not yet covered in the HELP file.

Raymond

[caraveiro]

Wow!... Last version will do!

Thank you very much!