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getpixel

Started by LinX Nov 24, 2001 at 12:03 AM 2 replies 650+ views

Original Post

Nov 24, 2001 at 12:03 AM

if i want to check the color of each pixel in a texture.. can i loop tru the texture width n height and use GetPixel ? thnx

Xeno

Nov 24, 2001 at 6:04 AM

it depends , if u want to check a color on DirectX's surface
you have to Lock the surface and then to read each pixel.
it looks like that: (Depends that the texture is 16 bit)

      
	D3DLOCKED_RECT d3dlocked;
	int wloop;
	int hloop;
        DWORD pixel;
        DWORD Offset;


	lp_d3d8_texture->LockRect(TexLevel,&d3dlocked,NULL,0);


	for(wloop = 0;wloop < Width;wloop++)
	{
		for(hloop = 0;hloop < Height;hloop++)
		{
			Offset = (hloop * d3dlocked.Pitch) + (wloop * 3);
			pixel = *(DWORD *)((DWORD)(lpTexBits) + Offset);

                        ...
                        ...
                        ...
                        Do what u want to do with the pixel
                        ...
                        ...
                        ...
                }
        }

but if u want to read a pixel from a win32api bitmap u can loop over the width and height of the bitmap and use GetPixel();

Hopes its helps.

Edited by - xeno on November 24, 2001 7:06:49 AM

Edited by - xeno on November 24, 2001 7:08:03 AM

LinX

Author

LinX

Nov 24, 2001 at 10:51 AM

thanks alot.

Xeno

Nov 24, 2001 at 12:17 PM

ops , in that line i made a mistake:
Offset = (hloop * d3dlocked.Pitch) + (wloop * 3);
change it to that:
Offset = (hloop * d3dlocked.Pitch) + (wloop * 2);

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