Impala Documentation

void OglGui::Carousel3D::ReadPixels	(	OGLIMAGE *	oglIm,
		int	x,
		int	y,
		int	w,
		int	h
	)			`[inline, protected]`

Definition at line 334 of file Carousel3D.h.

Referenced by OglImCapture().

00335     {
00336         if (oglIm->imData)
00337             free(oglIm->imData);
00338 
00339             // Allocate memory for a 4 byte RGBA buffer
00340             if( !(oglIm->imData = (void *) malloc(w * h * 4))){
00341                     oglSys.ErrorBox("Error", "Could not allocate image memory");
00342                     exit( 0 );;
00343             }
00344         oglIm->w = w;
00345         oglIm->h = h;
00346 
00347             // Specification of our image alignment
00348             glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Contineous pixels
00349             glPixelStorei(GL_UNPACK_ROW_LENGTH, w); // Width of 1 line in our buffer
00350             glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
00351             glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
00352 
00353             glReadPixels( x, y, w, h, GL_RGBA, GL_UNSIGNED_BYTE, oglIm->imData );
00354 
00355         glPixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
00356         glPixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
00357         glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
00358         oglIm->changed = 1;
00359     }