BitBlt Tutorials

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

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? :confused:

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

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

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

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

Code:

---

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

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

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;
}

---

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

I think Megatron gave it to me.

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

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