Direct Draw Source Color Keying

Swatter555 · 2003-09-26T19:25:54

Color keying one color works fine, yet I cant seem to make a range of colors transparent. Ill list the function that creates the surface and sets the color key, then I will list the part of the code that makes the call. Thanks in advance. LPDIRECTDRAWSURFACE7 LoadBmpOffSurface32(LPDIRECTDRAWSURFACE7 lpddsoff, int lred, int lgreen,int lblue, int hred, int hgreen,int hblue, const char* bmp_file_path) { //Locals BITMAP bitmap24; HBITMAP hbitmap24; DDSURFACEDESC2 ddsd; //clear out ddsd DDRAW_INIT_STRUCT(ddsd); // load the bitmap hbitmap24 = (HBITMAP)LoadImage(NULL,bmp_file_path,IMAGE_BITMAP, 0,0,LR_DEFAULTSIZE|LR_LOADFROMFILE); // return if we failed to load the bitmap if (FAILED(hbitmap24)) { //If failure, Show MB MessageBox(main_window_handle, "FATAL ERROR:UNABLE TO LOAD BITMAP", "DirectX Error Message", MB_OK); return(0); } //endif // get bitmap dimensions GetObject(hbitmap24,sizeof(BITMAP),&bitmap24); int surf_width =bitmap24.bmWidth; int surf_height=bitmap24.bmHeight; // create surface////////////////////////// /////////////////////////////////////////// HRESULT ddrval; ZeroMemory(&ddsd,sizeof(ddsd)); ddsd.dwSize = sizeof(DDSURFACEDESC2); ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT | DDSD_CKSRCBLT; ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY; ddsd.dwWidth = surf_width; ddsd.dwHeight = surf_height; // attempt to create surface ddrval=lpdd->CreateSurface(&ddsd,&lpddsoff,NULL); // created ok? if (ddrval!=DD_OK) { //If failure, Show MB MessageBox(main_window_handle, "FATAL ERROR:UNABLE TO CREATE OFFSCREEN SURFACE", "DirectX Error Message", MB_OK); lpddsoff= NULL; } //end if else { //get a DC for the surface HDC hdc; lpddsoff->GetDC(&hdc); // generate a compatible DC HDC bit_dc=CreateCompatibleDC(hdc); // blit the interface to the surface SelectObject(bit_dc,hbitmap24); BitBlt(hdc,0,0,surf_width,surf_height,bit_dc,0,0,SRCCOPY); // release the DCs lpddsoff->ReleaseDC(hdc); DeleteDC(bit_dc); // set up the color key DDCOLORKEY key; key.dwColorSpaceLowValue = _RGB32BIT (255,lred,lgreen,lblue); key.dwColorSpaceHighValue= _RGB32BIT(255,hred,hgreen,hblue); lpddsoff->SetColorKey(DDCKEY_SRCBLT | DDCKEY_COLORSPACE,&key); } //end else // unload bitmap DeleteObject(hbitmap24); return(lpddsoff); //return the surface //End That Function //Here is where I call the function: bmp_file_name = "graphics/tiles/CBORDER1.bmp"; //loads bmp onto surface lpddsCBORDER1 = LoadBmpOffSurface32(lpddsCBORDER1, 200,200,200, 255,255,255, bmp_file_name); [edited by - Swatter555 on September 24, 2003 4:45:27 AM]

Graphics and GPU Programming Programming

Started by Swatter555 September 24, 2003 03:38 AM

16 comments, last by Swatter555 20 years, 7 months ago

Swatter555

127

Author

September 25, 2003 03:40 AM

LOL, Im not complaining either...you can see the massive response I have gotten in this thread. Any help is very appreciated.

RhoneRanger

100

September 25, 2003 03:47 AM

This is what I meant by low and high values

key.dwColorSpaceLowValue = _RGB32BIT (255,lred,lgreen,lblue); key.dwColorSpaceHighValue= _RGB32BIT(255,hred,hgreen,hblue);

You SHOULD keep the same color values throughout the whole app.

I am not sure what else you are looking for, as long as a color in a texture is within this range, you should have no problems.

*NOTE

I saw you used RGB32BIT, are you sure you are loading 32 bit texures? If not, you would ned RGB 5,6,5 or 5,5,5 (16 bit) or RGB 8,8,8 24 bit.

The key color low and high values need to match the format for the back buffer.

I hope I am making some sence!

TechleadEnilno, the Ultima 2 projectwww.dr-code.org/enilno

Swatter555

127

Author

September 25, 2003 04:23 AM

Ya, I think we are on the same page. The display is 32bit and the loader converts the bitmaps into the bpp of the primary surface.

I am using the loader provided here:
http://www.mvps.org/directx/articles/color_depth_conversion.htm

My code is the same, except I do convert the the color key format, something he left out of his code.

Maybe you can make something out of this if you check his code.

Swatter555

127

Author

September 25, 2003 04:21 PM

Could someone please look at the above source code and tell me what is the problem. I think this thread has been here 2 1/2 days, and only one person has responded. Any help would be very appreciated.

RhoneRanger

100

September 26, 2003 04:28 AM

swatter, the code looks decent, and I can''t see anything wrong with it. Perhaps it''s in your rendering code?

TechleadEnilno, the Ultima 2 projectwww.dr-code.org/enilno

Swatter555

127

Author

September 26, 2003 05:41 PM

Thanks RhoneRanger, I will go back and look at everything in its entirety.

Swatter555

127

Author

September 26, 2003 06:16 PM

This is my blit call:

if(FAILED(lpddsback->Blt(&blit_rect_dest, bmp_surface, &blit_rect_source,(DDBLT_WAIT | DDBLT_KEYSRC),NULL)))

For range color keying, is there another flag I need to use? I will check the directx docs in tandem with this post.

Swatter555

127

Author

September 26, 2003 07:25 PM

Ok, if anyone is still paying attention. Could someone give me a link or some source code that shows a working example of range color keying. Preferably a full program, but not too big. Thanks in advance

Direct Draw Source Color Keying

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