/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * GDI LineTo
 *
 * Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* do not include this file directly! */

int LINE_TO(HGDI_DC hdc, int nXEnd, int nYEnd)
{
	int x, y;
	int x1, y1;
	int x2, y2;
	int e, e2;
	int dx, dy;
	int sx, sy;
	int bx1, by1;
	int bx2, by2;
	PIXEL_TYPE pen;
	PIXEL_TYPE* pixel;
	HGDI_BITMAP bmp;

	x1 = hdc->pen->posX;
	y1 = hdc->pen->posY;
	x2 = nXEnd;
	y2 = nYEnd;

	dx = (x1 > x2) ? x1 - x2 : x2 - x1;
	dy = (y1 > y2) ? y1 - y2 : y2 - y1;

	sx = (x1 < x2) ? 1 : -1;
	sy = (y1 < y2) ? 1 : -1;

	e = dx - dy;

	x = x1;
	y = y1;

	bmp = (HGDI_BITMAP) hdc->selectedObject;

	if (hdc->clip->null)
	{
		bx1 = (x1 < x2) ? x1 : x2;
		by1 = (y1 < y2) ? y1 : y2;
		bx2 = (x1 > x2) ? x1 : x2;
		by2 = (y1 > y2) ? y1 : y2;
	}
	else
	{
		bx1 = hdc->clip->x;
		by1 = hdc->clip->y;
		bx2 = bx1 + hdc->clip->w - 1;
		by2 = by1 + hdc->clip->h - 1;
	}

	bx1 = MAX(bx1, 0);
	by1 = MAX(by1, 0);
	bx2 = MIN(bx2, bmp->width - 1);
	by2 = MIN(by2, bmp->height - 1);
	
	gdi_InvalidateRegion(hdc, bx1, by1, bx2 - bx1 + 1, by2 - by1 + 1);

	pen = GDI_GET_PEN_COLOR(hdc->pen);

	while (1)
	{
		if (!(x == x2 && y == y2))
		{
			if ((x >= bx1 && x <= bx2) && (y >= by1 && y <= by2))
			{
				pixel = GDI_GET_POINTER(bmp, x, y);
				SET_PIXEL_ROP2(pixel, &pen);
			}
		}
		else
		{
			break;
		}

		e2 = 2 * e;

		if (e2 > -dy)
		{
			e -= dy;
			x += sx;
		}

		if (e2 < dx)
		{
			e += dx;
			y += sy;
		}
	}

	return 1;
}

/*
#undef LINE_TO
#undef PIXEL_TYPE
#undef SET_PIXEL_ROP2
#undef GDI_GET_POINTER
#undef GDI_GET_PEN_COLOR
*/