/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * GDI Line Functions

 *

 * Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 * Copyright 2016 Armin Novak <armin.novak@thincast.com>

 * Copyright 2016 Thincast Technologies GmbH

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <freerdp/freerdp.h>

#include <freerdp/gdi/gdi.h>

#include <freerdp/gdi/pen.h>

#include <freerdp/gdi/bitmap.h>

#include <freerdp/gdi/region.h>

#include "drawing.h"

#include "clipping.h"

#include "line.h"

/**

 * Draw a line from the current position to the given position.\n

 * @msdn{dd145029}

 * @param hdc device context

 * @param nXEnd ending x position

 * @param nYEnd ending y position

 * @return nonzero if successful, 0 otherwise

 */

static BOOL gdi_rop_color(UINT32 rop, BYTE* pixelPtr, UINT32 pen, UINT32 format)

{

	const UINT32 srcPixel = ReadColor(pixelPtr, format);

	UINT32 dstPixel;

	switch (rop)

	{

		case GDI_R2_BLACK: /* LineTo_BLACK */

			dstPixel = FreeRDPGetColor(format, 0, 0, 0, 0xFF);

			break;

		case GDI_R2_NOTMERGEPEN: /* LineTo_NOTMERGEPEN */

			dstPixel = ~(srcPixel | pen);

			break;

		case GDI_R2_MASKNOTPEN: /* LineTo_MASKNOTPEN */

			dstPixel = srcPixel & ~pen;

			break;

		case GDI_R2_NOTCOPYPEN: /* LineTo_NOTCOPYPEN */

			dstPixel = ~pen;

			break;

		case GDI_R2_MASKPENNOT: /* LineTo_MASKPENNOT */

			dstPixel = pen & ~srcPixel;

			break;

		case GDI_R2_NOT: /* LineTo_NOT */

			dstPixel = ~srcPixel;

			break;

		case GDI_R2_XORPEN: /* LineTo_XORPEN */

			dstPixel = srcPixel ^ pen;

			break;

		case GDI_R2_NOTMASKPEN: /* LineTo_NOTMASKPEN */

			dstPixel = ~(srcPixel & pen);

			break;

		case GDI_R2_MASKPEN: /* LineTo_MASKPEN */

			dstPixel = srcPixel & pen;

			break;

		case GDI_R2_NOTXORPEN: /* LineTo_NOTXORPEN */

			dstPixel = ~(srcPixel ^ pen);

			break;

		case GDI_R2_NOP: /* LineTo_NOP */

			dstPixel = srcPixel;

			break;

		case GDI_R2_MERGENOTPEN: /* LineTo_MERGENOTPEN */

			dstPixel = srcPixel | ~pen;

			break;

		case GDI_R2_COPYPEN: /* LineTo_COPYPEN */

			dstPixel = pen;

			break;

		case GDI_R2_MERGEPENNOT: /* LineTo_MERGEPENNOT */

			dstPixel = srcPixel | ~pen;

			break;

		case GDI_R2_MERGEPEN: /* LineTo_MERGEPEN */

			dstPixel = srcPixel | pen;

			break;

		case GDI_R2_WHITE: /* LineTo_WHITE */

			dstPixel = FreeRDPGetColor(format, 0xFF, 0xFF, 0xFF, 0xFF);

			break;

		default:

			return FALSE;

	}

	return WriteColor(pixelPtr, format, dstPixel);

}

BOOL gdi_LineTo(HGDI_DC hdc, UINT32 nXEnd, UINT32 nYEnd)

{

	INT32 x, y;

	INT32 x1, y1;

	INT32 x2, y2;

	INT32 e, e2;

	INT32 dx, dy;

	INT32 sx, sy;

	INT32 bx1, by1;

	INT32 bx2, by2;

	HGDI_BITMAP bmp;

	UINT32 pen;

	INT32 rop2 = gdi_GetROP2(hdc);

	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);

	if (!gdi_InvalidateRegion(hdc, bx1, by1, bx2 - bx1 + 1, by2 - by1 + 1))

		return FALSE;

	pen = gdi_GetPenColor(hdc->pen, bmp->format);

	while (1)

	{

		if (!(x == x2 && y == y2))

		{

			if ((x >= bx1 && x <= bx2) && (y >= by1 && y <= by2))

			{

				BYTE* pixel = gdi_GetPointer(bmp, x, y);

				gdi_rop_color(rop2, pixel, pen, bmp->format);

			}

		}

		else

		{

			break;

		}

		e2 = 2 * e;

		if (e2 > -dy)

		{

			e -= dy;

			x += sx;

		}

		if (e2 < dx)

		{

			e += dx;

			y += sy;

		}

	}

	return TRUE;

}

/**

 * Draw one or more straight lines

 * @param hdc device context

 * @param lppt array of points

 * @param cCount number of points

 * @return nonzero on success, 0 otherwise

 */

BOOL gdi_PolylineTo(HGDI_DC hdc, GDI_POINT* lppt, DWORD cCount)

{

	DWORD i;

	for (i = 0; i < cCount; i++)

	{

		if (!gdi_LineTo(hdc, lppt[i].x, lppt[i].y))

			return FALSE;

		if (!gdi_MoveToEx(hdc, lppt[i].x, lppt[i].y, NULL))

			return FALSE;

	}

	return TRUE;

}

/**

 * Draw one or more straight lines

 * @param hdc device context

 * @param lppt array of points

 * @param cPoints number of points

 * @return nonzero on success, 0 otherwise

 */

BOOL gdi_Polyline(HGDI_DC hdc, GDI_POINT* lppt, UINT32 cPoints)

{

	if (cPoints > 0)

	{

		UINT32 i;

		GDI_POINT pt;

		if (!gdi_MoveToEx(hdc, lppt[0].x, lppt[0].y, &pt))

			return FALSE;

		for (i = 0; i < cPoints; i++)

		{

			if (!gdi_LineTo(hdc, lppt[i].x, lppt[i].y))

				return FALSE;

			if (!gdi_MoveToEx(hdc, lppt[i].x, lppt[i].y, NULL))

				return FALSE;

		}

		if (!gdi_MoveToEx(hdc, pt.x, pt.y, NULL))

			return FALSE;

	}

	return TRUE;

}

/**

 * Draw multiple series of connected line segments

 * @param hdc device context

 * @param lppt array of points

 * @param lpdwPolyPoints array of numbers of points per series

 * @param cCount count of entries in lpdwPolyPoints

 * @return nonzero on success, 0 otherwise

 */

BOOL gdi_PolyPolyline(HGDI_DC hdc, GDI_POINT* lppt, UINT32* lpdwPolyPoints, DWORD cCount)

{

	UINT32 cPoints;

	DWORD i, j = 0;

	for (i = 0; i < cCount; i++)

	{

		cPoints = lpdwPolyPoints[i];

		if (!gdi_Polyline(hdc, &lppt[j], cPoints))

			return FALSE;

		j += cPoints;

	}

	return TRUE;

}

/**

 * Move pen from the current device context to a new position.

 * @param hdc device context

 * @param X x position

 * @param Y y position

 * @return nonzero on success, 0 otherwise

 */

BOOL gdi_MoveToEx(HGDI_DC hdc, UINT32 X, UINT32 Y, HGDI_POINT lpPoint)

{

	if (lpPoint != NULL)

	{

		lpPoint->x = hdc->pen->posX;

		lpPoint->y = hdc->pen->posY;

	}

	hdc->pen->posX = X;

	hdc->pen->posY = Y;

	return TRUE;

}