Zoom out

Instead of using a cube and rendering the texture to it and moving in backwards to achieve a zoomed out effect, I rather wrote this simple method to take care of this:

private void renderImage(Rectangle dst, float magnification) {
		float width, height;
		float horizontalOffset, verticalOffset;
		
		// Default: Fill screen horizontally
		width = 1f;
		height = dst.getHeight()/(float) dst.getWidth();
		
		
		// magnification
		width *= magnification;
		height *= magnification;
		
		// Offsets
		horizontalOffset = width/2f;
		verticalOffset = height/2f;
		
		// Do the actual OpenGL rendering
		glBegin (GL_QUADS);
		// Right top
		glTexCoord2f(0.0f, 0.0f);
		glVertex2f(-0.5f + horizontalOffset, verticalOffset);

		// Right bottom
		glTexCoord2f(0.0f, 1.0f);
		glVertex2f(-0.5f + horizontalOffset, -verticalOffset);

		// Left bottom
		glTexCoord2f(1.0f,1.0f);
		glVertex2f(-0.5f - horizontalOffset, -verticalOffset);

		// Left top
		glTexCoord2f(1.0f, 0.0f);
		glVertex2f(-0.5f - horizontalOffset, verticalOffset);
		glEnd();
		
	}

The only problem is that the image seems to be stretched along the horizontal axis.