Scaled Layers in GDI - c

Question

Original question
Basically, I have two bitmaps, and I want to put one behind the other, scaled down to half its size.
Both are centered, and are of the same resolution.
The catch is that I want to put more than one bitmap on this back layer eventually, and want the scaling to apply to the whole layer and not just the individual bitmap.
My thought is I would use a memory DC for the back layer, capture its contents into a bitmap of its own and use StretchBlt to place it in my main dc
The code I have right now doesn't work, and I can't make sense of it, let alone find anyone who had done this before for direction.
My variables at the moment are as follows
hBitmap - back bitmap
hFiller - front bitmap
hdc - main DC
ldc - back DC(made with CreateCompatibleDC(hdc);)
resh - width of hdc
resv - height of hdc
note that my viewport origin is set to the center
--this part above is solved, with the one major issue being that it does not keep the back layers...
Revised Question
Here's my code. Everything works as intended except for the fact that the layers do not properly stack. They seem to erase what is underneath or fill it with black.
For the record this is a direct copy of my code. I explain sections of it but there is nothing missing between the code blocks.
case WM_TIMER:
{
switch(wParam)
{
case FRAME:
If any position or rotation values have changed, the following section of code clears the screen and prepares it to be rewritten
if(reload == TRUE){
tdc = CreateCompatibleDC(hdc);
oldFiller = SelectObject(tdc,hFiller);
GetObject(hFiller, sizeof(filler), &filler);
StretchBlt(hdc, 0-(resh/2), 0-(resv/2), resh, resv, tdc, 0, 0, 1, 1, SRCCOPY);
SelectObject(tdc,oldFiller);
DeleteDC(tdc);
if(turn == TRUE){
xForm.eM11 = (FLOAT) cos(r/angleratio);
xForm.eM12 = (FLOAT) sin(r/angleratio);
xForm.eM21 = (FLOAT) -sin(r/angleratio);
xForm.eM22 = (FLOAT) cos(r/angleratio);
xForm.eDx = (FLOAT) 0.0;
xForm.eDy = (FLOAT) 0.0;
SetWorldTransform(hdc, &xForm);
}
This is the part that only partially works. At a distance of 80 my scale value will make my bitmap 1 pixel by 1 pixel, so I consider this my "draw distance"
It scales properly, but the layers do not stack, as I mentioned above
for(int i=80;i>1;i--){
tdc = CreateCompatibleDC(hdc);
tbm = CreateCompatibleBitmap(hdc, resh, resv);
SelectObject(tdc, tbm);
BitBlt(tdc, 0-(resh/2), 0-(resv/2), resh, resv,hdc,0,0,SRCCOPY);
//drawing code goes in here
ldc = CreateCompatibleDC(hdc);
oldBitmap = SelectObject(ldc,hBitmap);
StretchBlt(tdc,(int)(angleratio*atan((double)128/(double)i)),0,(int)(angleratio*atan((double)128/(double)i)),(int)(angleratio*atan((double)128/(double)i)),ldc,0,0,128,128,SRCCOPY);
SelectObject(ldc,oldBitmap);
DeleteDC(ldc);
BitBlt(hdc, 0, 0, resh, resv, tdc, 0, 0, SRCCOPY);
DeleteObject(tbm);
DeleteDC(tdc);
}
reload = FALSE;
}
This section below just checks for keyboard input which changes the position or rotation of the "camera"
This part works fine and can be ignored
if(GetKeyboardState(NULL)==TRUE){
reload = TRUE;
if(GetKeyState(VK_UP)<0){
fb--;
}
if(GetKeyState(VK_DOWN)<0){
fb++;
}
if(GetKeyState(VK_RIGHT)<0){
lr--;
}
if(GetKeyState(VK_LEFT)<0){
lr++;
}
if(GetKeyState(0x57)<0){
p++;
}
if(GetKeyState(0x53)<0){
p--;
}
}
break;
}
}
break;