#include "SpriteRasterizer.h"
#include "FrameBuffer.h"
#include "../RenderData/Image.h"
#include "../RenderData/Sprite.h"

namespace Rasterizer
{
	void SpriteRasterizer::DrawImage(const RenderData::Image& image, int32_t x, int32_t y)
	{
		DrawSprite(RenderData::Sprite(&image), x, y);
	}

	void SpriteRasterizer::DrawSprite(const RenderData::Sprite& sprite, int32_t x, int32_t y)
	{
		if (frameBuffer == nullptr || !sprite.is_valid())
		{
			return;
		}

		const int32_t minX = x < 0 ? -x : 0;
		const int32_t minY = y < 0 ? -y : 0;
		const int32_t maxX = x + sprite.width > frameBuffer->get_width() ? frameBuffer->get_width() - x : sprite.width;
		const int32_t maxY = y + sprite.height > frameBuffer->get_height() ? frameBuffer->get_height() - y : sprite.height;

		if (minX >= maxX || minY >= maxY)
		{
			return;
		}

		for (int32_t sy = minY; sy < maxY; ++sy)
		{
			for (int32_t sx = minX; sx < maxX; ++sx)
			{
				const uint32_t color = sprite.get_pixel_fast(sx, sy);
				const uint8_t alpha = static_cast<uint8_t>(color & 0xFF);
				if (alpha == 0)
				{
					continue;
				}

				frameBuffer->set_pixel(x + sx, y + sy, color);
			}
		}
	}
}