#include "../stdafx.h"
#include "../gfx.h"
#include "32bpp_base.hpp"

void *Blitter_32bppBase::MoveTo(const void *video, int x, int y)
{
	return (uint32 *)video + x + y * _screen.pitch;
}

void Blitter_32bppBase::SetPixel(void *video, int x, int y, uint8 color)
{
	*((uint32 *)video + x + y * _screen.pitch) = LookupColourInPalette(color);
}

void Blitter_32bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 color)
{
	uint32 *dst = (uint32 *)video + x + y * _screen.pitch;
	if (*dst == 0) *dst = LookupColourInPalette(color);
}

void Blitter_32bppBase::SetHorizontalLine(void *video, int width, uint8 color)
{
	uint32 *dst = (uint32 *)video;
	uint32 color32 = LookupColourInPalette(color);

	for (; width > 0; width--) {
		*dst = color32;
		dst++;
	}
}

void Blitter_32bppBase::DrawLine(void *video, int x, int y, int x2, int y2, uint8 color)
{
	int dy;
	int dx;
	int stepx;
	int stepy;
	int frac;

	dy = (y2 - y) * 2;
	if (dy < 0) {
		dy = -dy;
		stepy = -1;
	} else {
		stepy = 1;
	}

	dx = (x2 - x) * 2;
	if (dx < 0) {
		dx = -dx;
		stepx = -1;
	} else {
		stepx = 1;
	}

	this->SetPixel(video, x, y, color);
	if (dx > dy) {
		frac = dy - (dx >> 1);
		while (x != x2) {
			if (frac >= 0) {
				y += stepy;
				frac -= dx;
			}
			x += stepx;
			frac += dy;
			this->SetPixel(video, x, y, color);
		}
	} else {
		frac = dx - (dy >> 1);
		while (y != y2) {
			if (frac >= 0) {
				x += stepx;
				frac -= dy;
			}
			y += stepy;
			frac += dx;
			this->SetPixel(video, x, y, color);
		}
	}
}

void Blitter_32bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
{
	int direction = (height < 0) ? -1 : 1;
	uint32 *dst = (uint32 *)video;
	uint32 *usrc = (uint32 *)src;

	height = abs(height);
	for (; height > 0; height--) {
		memcpy(dst, usrc, width * sizeof(uint32));
		usrc += src_pitch * direction;
		dst += _screen.pitch * direction;
	}
}

void Blitter_32bppBase::CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
{
	int direction = (height < 0) ? -1 : 1;
	uint32 *udst = (uint32 *)dst;
	uint32 *src = (uint32 *)video;

	height = abs(height);
	for (; height > 0; height--) {
		memcpy(udst, src, width * sizeof(uint32));
		src += _screen.pitch * direction;
		udst += dst_pitch * direction;
	}
}

void Blitter_32bppBase::MoveBuffer(void *video_dst, const void *video_src, int width, int height)
{
	uint32 *dst = (uint32 *)video_dst;
	uint32 *src = (uint32 *)video_src;

	for (; height > 0; height--) {
		memmove(dst, src, width * sizeof(uint32));
		src += _screen.pitch;
		dst += _screen.pitch;
	}
}

int Blitter_32bppBase::BufferSize(int width, int height)
{
	return width * height * sizeof(uint32);
}