blitting problem

[cozman]

Hey, I have found the final bug in this portion of my program and narrowed it down to a single line:

DoError((char*)DXGetErrorDescription8(dest->Blt(&destRect, Image[frame], &srcRect,
DDBLT_KEYSRC|DDBLT_WAIT, NULL)));
//error is that there are invalid parameters, commenting out DDBLT_KEYSRC fixes this


I have attached the entire file below (it isn't too long just 140 lines, and most can be ignored b/c the error must be in certain places) and I would greatly appreciate it if anybody can find why I am getting the invalid parameter error from this code. Thanks so much :)

[MrWizard]

RECT destRect;

//horizontal extent
destRect.left = x;
destRect.right = destRect.left + Width;

//vertical extent
destRect.top = y;
destRect.bottom = y+Height;

//blit it
DoError((char*)DXGetErrorDescription8(dest->Blt( &destRect, Image[frame], &srcRect, DDBLT_KEYSRC | DDBLT_WAIT, NULL)));
//error is that there are invalid parameters, commenting out DDBLT_KEYSRC fixes this

Excuse the mess , I'm new to the CODE tag, when trying to post Code... anyways, I dont see where you defined RECT srcRect . That would certainly be an invalid parameter. I see where you defined destRect, but not the source. Maybe I am blind.

[cozman]

I am sure that the invalid param is DDBLT_KEYSRC... i have tested w/ and w/o it and i only get the error with it. that rect is actually a private class member if you noticed in the attached file. Thanks for trying to help.. if you have any DD7 code w/ transparency please share :)



MY 200th Post!!!!!!!!!!!!!!
Wooooo!
2-0-0!

[Unregistered]

Okay, here are some snippets from my game. Um, they are intentionally copy and pasted missing sections, but should show you how I transparently blit my sprites to my back buffer and then flip.

DDCOLORKEY magnus = {0x00FF00FF, 0x00FF00FF};
DDSURFACEDESC2 ddsd;

ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT | DDSD_CKSRCBLT;
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
ddsd.ddsCaps.dwCaps2 = ddsd.ddsCaps.dwCaps3 = ddsd.ddsCaps.dwCaps4 = 0;
ddsd.dwWidth = CX_SPRITE;
ddsd.dwHeight = ( siCount * CY_SPRITE );
ddsd.ddckCKSrcBlt = magnus;

if(FAILED( hr = pDD7->CreateSurface( &ddsd, &pDDOS, NULL ) ) )
{
pDDSurface->Release();
pDD7->Release();
return 0;
}


that's where i setup my off-screen surface for my sprites, with the source key blitting..... Then when i blit, here is the line of code...

// Draw our main character sprite to the screen
HRESULT hResult = pDDBack->Blt( &rectDst, pDDOS, &rectSrc, DDBLT_WAIT | DDBLT_KEYSRC, NULL );


Hope this helps :)

[MrWizard]

Oops, that was my post above, I don't know why it shows it as unregistered??? So if you have any questions about that code, e-mail me or catch my on AIM "purged by request"

[cozman]

thanks, ill let you know how it comes out