Example #1
0
	ImageGeneric(const std::vector<unsigned int>& stride, const std::vector<unsigned int>& rows, std::mt19937& rng) {

		// count planes
		assert(stride.size() == rows.size());
		unsigned int planes = stride.size();
		m_data.resize(planes);
		m_stride.resize(planes);

		// calculate stride and total size
		size_t totalsize = 0;
		for(unsigned int p = 0; p < planes; ++p) {
			m_stride[p] = grow_align16(stride[p]);
			totalsize += m_stride[p] * rows[p];
		}

		// allocate buffer
		m_buffer.Alloc(totalsize);
		for(unsigned int i = 0; i < totalsize; ++i) {
			m_buffer[i] = rng();
		}

		// set data
		uint8_t *data = m_buffer.GetData();
		for(unsigned int p = 0; p < planes; ++p) {
			m_data[p] = data;
			data += m_stride[p] * rows[p];
		}

	}
void Scale_BGRA_Generic(unsigned int in_w, unsigned int in_h, const uint8_t* in_data, int in_stride,
						unsigned int out_w, unsigned int out_h, uint8_t* out_data, int out_stride,
						MipMapFunction mipmap_function, BilinearFunction bilinear_function) {

	// no scaling?
	if(in_w == out_w && in_h == out_h) {
		if(in_stride == out_stride) {
			memcpy(out_data, in_data, in_stride * in_h);
		} else {
			for(unsigned int out_j = 0; out_j < out_h; ++out_j) {
				memcpy(out_data, in_data, in_w * 4);
				in_data += in_stride;
				out_data += out_stride;
			}
		}
		return;
	}

	// calculate mipmap factors
	unsigned int mx = 0, my = 0;
	while((out_w << (mx + 1)) <= in_w) ++mx;
	while((out_h << (my + 1)) <= in_h) ++my;
	if(mx + my > 8) {
		if(mx <= 4)
			my = 8 - mx;
		else if(my <= 4)
			mx = 8 - my;
		else
			mx = my = 4;
	}

	// pure mipmap scaling?
	if((out_w << mx) == in_w && (out_h << my) == in_h) {
		mipmap_function(in_w, in_h, in_data, in_stride, out_data, out_stride, mx, my);
		return;
	}

	// create mipmap
	TempBuffer<uint8_t> mipmap;
	if(mx != 0 || my != 0) {
		unsigned int mipmap_w = ((in_w - 1) >> mx) + 1, mipmap_h = ((in_h - 1) >> my) + 1;
		int mipmap_stride = grow_align16(mipmap_w * 4);
		mipmap.Alloc(mipmap_stride * mipmap_h);
		mipmap_function(in_w, in_h, in_data, in_stride, mipmap.GetData(), mipmap_stride, mx, my);
		in_data = mipmap.GetData();
		in_stride = mipmap_stride;
	}