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Loading Bitmaps in DDraw

Started by zeroshot Dec 23, 2001 at 9:13 AM 1 replies 250+ views

Original Post

Dec 23, 2001 at 9:13 AM

Can ne 1 plz give me some code to load a 16bit bmp onto a ddraw surface, i got some code out of a book i got but it does 8bit bmps plz or some decent web sites for total newbies

YoshiN

Dec 23, 2001 at 11:13 AM

I recently had a lot of trouble with this myself, so I'll give you the code that I wrote:

    
///////////////////////////////////////////////////////////////

//

//   Loads a bitmap from a file (fname) onto the surface(image)

//

///////////////////////////////////////////////////////////////

int Load_Bitmap(LPDIRECTDRAWSURFACE7 image,
				char *fname)
{
	HDC hdc, hdcimage;	// device context of the surface and image

	BITMAP bitmap;		// bitmap object

	HBITMAP hbitmap;	// handle to the bitmap


	// load the bitmap and get the object

	hbitmap = (HBITMAP)LoadImage(NULL, fname, IMAGE_BITMAP, 0, 0,
								LR_LOADFROMFILE);
	if(hbitmap == NULL)
		return(0);

	// get a device context that is compatible with the drawing surface

	hdcimage = CreateCompatibleDC(NULL);
	if(hdcimage == NULL)
		return(0);

	// select the handle to the bitmap as the object for the device context of the image

	if(SelectObject(hdcimage, hbitmap) == NULL)
		return(0);

	// get the size of the object

	if(GetObject(hbitmap, sizeof(bitmap), &bitmap) == NULL)
		return(0);

	// get the device context for the ddraw surface

	if(image->GetDC(&hdc)!=DD_OK)
		return(0);

	// blit the image from the image's DC to the surface's DC

	if(BitBlt(hdc, 0, 0, bitmap.bmWidth, bitmap.bmHeight, hdcimage, 0, 0, SRCCOPY) == NULL)
		return(0);

	// release the device context and destroy the image device context

	if(image->ReleaseDC(hdc)!=DD_OK)
		return(0);
	if(DeleteDC(hdcimage) == NULL)
		return(0);

	return(1);
}	// end Load_Image()

  

So just create a surface that is the same size of the image, and then use the following line:

      
// load penguinx.bmp onto the offscreen surface

	if(!Load_Bitmap(penguin, "penguins.bmp"))
		return(0);

penguin is an offscreenplain surface that is 300x200, and penguins.bmp is a 300x200x24 bitmap. This function will change the color depth of a bitmap so that it is compatible with the surface, so you can load a bitmap of any color depth onto a surface of any color depth.

-Yoshi
XGXCX ''99

Edited by - YoshiN on December 23, 2001 12:15:28 PM

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