Esempio n. 1
0
//! Creates a software image from part of a texture.
IImage* CNullDriver::createImage(ITexture* texture, const position2d<s32>& pos, const dimension2d<u32>& size)
{
	if ((pos==position2di(0,0)) && (size == texture->getSize()))
	{
		IImage* image = new CImage(texture->getColorFormat(), size, texture->lock(ETLM_READ_ONLY), false);
		texture->unlock();
		return image;
	}
	else
	{
		// make sure to avoid buffer overruns
		// make the vector a separate variable for g++ 3.x
		const vector2d<u32> leftUpper(clamp(static_cast<u32>(pos.X), 0u, texture->getSize().Width),
					clamp(static_cast<u32>(pos.Y), 0u, texture->getSize().Height));
		const rectangle<u32> clamped(leftUpper,
					dimension2du(clamp(static_cast<u32>(size.Width), 0u, texture->getSize().Width),
					clamp(static_cast<u32>(size.Height), 0u, texture->getSize().Height)));
		if (!clamped.isValid())
			return 0;
		u8* src = static_cast<u8*>(texture->lock(ETLM_READ_ONLY));
		if (!src)
			return 0;
		IImage* image = new CImage(texture->getColorFormat(), clamped.getSize());
		u8* dst = static_cast<u8*>(image->lock());
		src += clamped.UpperLeftCorner.Y * texture->getPitch() + image->getBytesPerPixel() * clamped.UpperLeftCorner.X;
		for (u32 i=0; i<clamped.getHeight(); ++i)
		{
			CColorConverter::convert_viaFormat(src, texture->getColorFormat(), clamped.getWidth(), dst, image->getColorFormat());
			src += texture->getPitch();
			dst += image->getPitch();
		}
		image->unlock();
		texture->unlock();
		return image;
	}
}