/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * GDI Clipping 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/region.h>

#include "clipping.h"

BOOL gdi_SetClipRgn(HGDI_DC hdc, INT32 nXLeft, INT32 nYLeft, INT32 nWidth,

                    INT32 nHeight)

{

	return gdi_SetRgn(hdc->clip, nXLeft, nYLeft, nWidth, nHeight);

}

/**

 * Get the current clipping region.\n

 * @msdn{dd144866}

 * @param hdc device context

 * @return clipping region

 */

HGDI_RGN gdi_GetClipRgn(HGDI_DC hdc)

{

	return hdc->clip;

}

/**

 * Set the current clipping region to null.

 * @param hdc device context

 * @return nonzero on success, 0 otherwise

 */

BOOL gdi_SetNullClipRgn(HGDI_DC hdc)

{

	gdi_SetClipRgn(hdc, 0, 0, 0, 0);

	hdc->clip->null = TRUE;

	return TRUE;

}

/**

 * Clip coordinates according to clipping region

 * @param hdc device context

 * @param x x1

 * @param y y1

 * @param w width

 * @param h height

 * @param srcx source x1

 * @param srcy source y1

 * @return nonzero if there is something to draw, 0 otherwise

 */

BOOL gdi_ClipCoords(HGDI_DC hdc, INT32* x, INT32* y, INT32* w, INT32* h,

                    INT32* srcx, INT32* srcy)

{

	GDI_RECT bmp;

	GDI_RECT clip;

	GDI_RECT coords;

	HGDI_BITMAP hBmp;

	int dx = 0;

	int dy = 0;

	BOOL draw = TRUE;

	if (hdc == NULL)

		return FALSE;

	hBmp = (HGDI_BITMAP) hdc->selectedObject;

	if (hBmp != NULL)

	{

		if (hdc->clip->null)

		{

			gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &clip);

		}

		else

		{

			gdi_RgnToRect(hdc->clip, &clip);

			gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &bmp);

			if (clip.left < bmp.left)

				clip.left = bmp.left;

			if (clip.right > bmp.right)

				clip.right = bmp.right;

			if (clip.top < bmp.top)

				clip.top = bmp.top;

			if (clip.bottom > bmp.bottom)

				clip.bottom = bmp.bottom;

		}

	}

	else

	{

		gdi_RgnToRect(hdc->clip, &clip);

	}

	gdi_CRgnToRect(*x, *y, *w, *h, &coords);

	if (coords.right >= clip.left && coords.left <= clip.right &&

	    coords.bottom >= clip.top && coords.top <= clip.bottom)

	{

		/* coordinates overlap with clipping region */

		if (coords.left < clip.left)

		{

			dx = (clip.left - coords.left);

			coords.left = clip.left;

		}

		if (coords.right > clip.right)

			coords.right = clip.right;

		if (coords.top < clip.top)

		{

			dy = (clip.top - coords.top);

			coords.top = clip.top;

		}

		if (coords.bottom > clip.bottom)

			coords.bottom = clip.bottom;

	}

	else

	{

		/* coordinates do not overlap with clipping region */

		coords.left = 0;

		coords.right = 0;

		coords.top = 0;

		coords.bottom = 0;

		draw = FALSE;

	}

	if (srcx != NULL)

		*srcx += dx;

	if (srcy != NULL)

		*srcy += dy;

	gdi_RectToCRgn(&coords, x, y, w, h);

	return draw;

}