Converting 8bit ddraw surface to 32-bit

[MrParrot]

I am currently implementing Bilinear filtering (and I will probably implement bicubic later) to cnc-ddraw's GDI render. First thing I must do is convert the 256 colors scheme used by C&C to 32-bits scheme. Currently, I tried to set the bmiHeader.biBitCount to 32 and use the line to convert a ddraw-surface to opengl texture:

((int*)upscaled)[i*dst_width+j] = ddraw->primary->palette->data_bgr[((unsigned char *)ddraw->primary->surface)[i*ddraw->primary->lPitch + j*ddraw->primary->lXPitch]];

But all that I get is a chunky blued output image.

 

Well, I was not going to post this message before revising things, but I pressed a bunch of keys by mistake on my keyboard and this topic was posted. Perhaps someone can give me some useful info.

Edited January 28, 2018 by MrParrot
incomplete post

[dkeeton]

I noticed that qt can read directdraw surfaces. Here is the source for it.

https://github.com/qt/qtimageformats/tree/5.10/src/plugins/imageformats/dds

 

[FunkyFr3sh]

If you want a quick solution without coding anything, try this https://msdn.microsoft.com/en-us/library/windows/desktop/dd145089(v=vs.85).aspx

It's very slow though, that's why I didn't include it with cnc-ddraw

 

2 Examples below (640x400 stretched to 960x600), default vs halftone