Blitting Bitmapswith DX7

If you setup DirectDraw to 256 color mode, all your bitmaps (supposing they are 16bit color) will look strange.

André Luiz Silva

Does the Blt (BltFast) Execute Correctly? Does the function return any error codes or DD_OK?

Some Possible causes are:

- Primary/Source bitmaps have not been cleared( via a Blt fill )
after init and as a result if the loaded bitmap doesnt fill the entire surface so you will get garbage on the rest of the surface.

- 16bit to 256 colors as stated before
- Bitmap loading function is creating the surface(s) incorrectly (or at worse has failed to load it at all )

- Other Evil DirectDraw Related Problems( Surface Lost, Invalid Rects, Incompatible Surface formats etc, See the DirectX SDK)

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Mike Cooper(norvain) - Mythical Masterpieces

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Blt returns DD_OK. I don''t think the Blt fill thing is my problem, since all my program does is show one bitmap. My surfaces and my bitmap are 256 colors. I blitted some red behind it and I noticed that my picture''s there, but it''s in black. It''s also badly warped.

Sounds like you''re using the width of the surface, instead of its pitch for pixel twiddling.

pSurfaceMemeory[y*ddsDesc.dwPitch+x] not ddsDesc.dwWidth

And if anyone has functional code use dx7 to do a solid color blt fill, I''d like to see it, I kept getting a invalid parameter error... (ended up just using memset )

Okay. Here it is:

void Blit(int x1, int y1, int x2, int y2, int c) { DDBLTFX ddbltfx; memset(&ddbltfx, 0 ,sizeof(DDBLTFX)); ddbltfx.dwSize = sizeof(DDBLTFX); ddbltfx.dwFillColor = c; RECT MyRect; MyRect.left = x1; MyRect.top = y1; MyRect.right = x2; MyRect.bottom = y2; lpddsprimary->Blt(&MyRect, NULL, NULL, DDBLT_COLORFILL | DDBLT_WAIT, &ddbltfx); }

Am I the only one who didn''t get ddutil.h with their SDK? I even bought the CD. It was 7.0a, though.

Here''s my prog, just so you can see the problem.

http://www.geocities.com/kev507.geo/dd7.zip

Im got the fuzzy stuff to go away. The wierd thing is, I can blit 64 X 64s, but not 32 X 32s. 32x32s always get squashed to half their height.