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El Duderino

Transparency problem DirectDraw

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Hail Dx Gurus, I am having woes with fastblit transparency. Here's the code :

// Attempt here to create "black", colour value 0, as transparent

	ckey.dwColorSpaceLowValue = 0;
	ckey.dwColorSpaceHighValue = 0;
	if (FAILED(lpDDSBackBuffer->SetColorKey(DDCKEY_SRCBLT, &ckey)))
	return 1;

// This is my experimental block

lpDDSBackBuffer->BltFast(0, 0, background, NULL, DDBLTFAST_WAIT); // | DDBLTFAST_SRCCOLORKEY);

lpDDSBackBuffer->BltFast(124, 0, background, NULL, DDBLTFAST_WAIT | DDBLTFAST_SRCCOLORKEY);
lpDDSBackBuffer->BltFast(62, 31, background, NULL, DDBLTFAST_WAIT | DDBLTFAST_SRCCOLORKEY);

lpDDSPrimary->Flip(0, DDFLIP_WAIT);

My first BltFast places my tile up in the left hand upper corner. Everything's groovy. But the two subsequent BltFasts, which are *supposed* to be only not blitting the black pixels, are not blitting any pixels at all. If I rip out the DDBLTFAST_SRCCOLORKEY part they blit happily but of course, no transparency. I cut what I thought to be the relevant bit only, I hope I didn't cut too little. Thanks for looking El Duderino Edited by - El Duderino on January 29, 2001 9:03:36 AM

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Hmmm... I don''t think the error is the blitting.
When I blit a picture without a colorkey using SRCCOLORKEY
it doesn''t show.


"If it doesn''t fit, force it; if it breaks, it needed replacement anyway."

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I read every similar post before returning here - every one of them, and none of them answered my question, even though this is a common one.

Thanks Coaster Kev and Mindwipe you have totally fixed things, it''s looking gorgeously transparent now !!!

El Duderino

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