BitBlt Tutorials

[SteveCRM]

Are there any good starting bitblt tutorials? Vlatkos faq has seemed to have disappeared...Thanks!

[SteveCRM]

winprog's isn't working for me
it works but whenever I try to put it in another project it bombs...and is there a way to have a transparent bitmap but loaded from a file instead of from a resource file?

Im really lookng to just make this a class for easy use.

[CyberCarsten]

If you are ready to read an entire book, then there is a whole chapter on it in the 'Programming Windows' by Charles Petzold.

[Technocrat]

Here is a real basic tutorial I made awhile back. There is a html file in there that is the acutal tutorial. I am not sure if it is the complete one anymore. The real one was on my site before my ISP destroyed it. I hope this helps

[Technocrat]

Also here is some code from an old project of mine that has a transparent bitmap. You can probably figure it out

/*###########################################################################################*/

/*
======================================================================================

Name:	DrawTransparentBitmap

Return:	None

In:		HDC hdc, HBITMAP hBitmap, short xStart, short yStart, COLORREF cTransparentColor 

Notes:	hdc Of The Device To Paint To, hBitmap Is The Bitmap To Be Transparent, XandYShort 
		Is The X and Y To Paint On The Device, Color Is The Color To Make Transparent

======================================================================================
*/

void DrawTransparentBitmap(HDC hdc, HBITMAP hBitmap,  short xPaint, short yPaint, short xStart, short xEnd, COLORREF cTransparentColor)
{
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>*/
	HDC			hdcMem	= CreateCompatibleDC(0);

	HBITMAP		hbmColour, 
				hbmMask;
/*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/
	
	//Get The Orginal Bitmap
	hbmColour = hBitmap;

	//Get The Mask, Make All Perfect Red Tansparent
	hbmMask = CreateBitmapMask(hbmColour, cTransparentColor,xStart, xEnd);

	if(xStart == -1)
	{
		//Get The Passed In Bitmap Info
		BITMAP bm;
		GetObject(hbmColour, sizeof(BITMAP), &bm);

		//BitBlt The Mask Image To The Screen
		SelectObject(hdcMem, hbmMask);
		BitBlt(hdc, xPaint, yPaint, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCAND);

		//BitBlt The Orginal Over The Mask
		SelectObject(hdcMem, hbmColour);
		BitBlt(hdc, xPaint, yPaint, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCPAINT);
	}
	else
	{
		//BitBlt The Mask Image To The Screen
		SelectObject(hdcMem, hbmMask);
		BitBlt(hdc, xPaint, yPaint, xEnd, 45, hdcMem, xStart, 0, SRCAND);

		//BitBlt The Orginal Over The Mask
		SelectObject(hdcMem, hbmColour);
		BitBlt(hdc, xPaint, yPaint, xEnd, 45, hdcMem, xStart, 0, SRCPAINT);
	}

	//Clean Up
	DeleteDC(hdcMem);
	DeleteObject(SelectObject(hdcMem, hbmMask));
	DeleteObject(SelectObject(hdcMem, hbmColour));

} 





/*###########################################################################################*/

/*
======================================================================================

Name:	CreateBitmapMask

Return:	HBITMAP

In:		HBITMAP hbmColour, COLORREF crTransparent 

Notes:	Returns The Mask For The Previous Function
		Function Was Not Created By Me

======================================================================================
*/

HBITMAP CreateBitmapMask(HBITMAP hbmColour, COLORREF crTransparent,short xStart, short xEnd)
{
	HDC hdcMem, hdcMem2;
	HBITMAP hbmMask;
	BITMAP bm;

	/*
		Create mask bitmap.
	*/
	GetObject(hbmColour, sizeof(BITMAP), &bm);
	hbmMask = CreateBitmap(bm.bmWidth, bm.bmHeight, 1, 1, NULL);

	hdcMem	= CreateCompatibleDC(0);
	hdcMem2 = CreateCompatibleDC(0);

	SelectObject(hdcMem, hbmColour);
	SelectObject(hdcMem2, hbmMask);

	/*
		Set the background colour of the colour image to the colour
		you want to be transparent.
	*/
	SetBkColor(hdcMem, crTransparent);
	/*
		Copy the bits from the colour image to the B+W mask... everything
		with the background colour ends up white while everythig else ends up
		black...Just what we wanted.
	*/
	BitBlt(hdcMem2, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
	/*
		Take our new mask and use it to turn the transparent colour in our
		original colour image to black so the transparency effect will
		work right.
	*/
	BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem2, 0, 0, SRCINVERT);
	
	//Clean up.
	DeleteDC(hdcMem);
	DeleteDC(hdcMem2);

	return hbmMask;
}

[CornedBee]

Where is the CreateBitmapMask from? It seems familiar to me.

[Technocrat]

I think Megatron gave it to me.

[SteveCRM]

i think I got it from microsoft...i did a search on google for something and I found that

[CornedBee]

I think I read it in "Programming Windows with MFC"...