FreeRDP/libfreerdp-gdi/gdi_shape.c

/**
 * FreeRDP: A Remote Desktop Protocol Client
 * GDI Shape Functions
 *
 * 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.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <freerdp/freerdp.h>
#include <freerdp/gdi/gdi.h>

#include "gdi_8bpp.h"
#include "gdi_16bpp.h"
#include "gdi_32bpp.h"
#include "gdi_bitmap.h"

#include "gdi_shape.h"

pFillRect FillRect_[5] =
{
	NULL,
	FillRect_8bpp,
	FillRect_16bpp,
	NULL,
	FillRect_32bpp
};

static void Ellipse_Bresenham(HGDI_DC hdc, int x1, int y1, int x2, int y2)
{
	int i;
	long e, e2;
	long dx, dy;
	int a, b, c;

	HGDI_BITMAP bmp;
	uint8 pixel8;
	uint16 pixel16;
	uint32 pixel32;
	int bpp = hdc->bitsPerPixel;

	a = (x1 < x2) ? x2 - x1 : x1 - x2;
	b = (y1 < y2) ? y2 - y1 : y1 - y2;
	c = b & 1;

	dx = 4 * (1 - a) * b * b;
	dy = 4 * (c + 1) * a * a;
	e = dx + dy + c * a * a;

	if (x1 > x2)
	{
		x1 = x2;
		x2 += a;
	}

	if (y1 > y2)
		y1 = y2;

	y1 += (b + 1) / 2;
	y2 = y1 - c;

	a *= 8 * a;
	c = 8 * b * b;

	pixel8 = 0;
	pixel16 = 0;
	pixel32 = 0;
	bmp = (HGDI_BITMAP) hdc->selectedObject;

	do
	{
		if (bpp == 32)
		{
			gdi_SetPixel_32bpp(bmp, x2, y1, pixel32);
			gdi_SetPixel_32bpp(bmp, x1, y1, pixel32);
			gdi_SetPixel_32bpp(bmp, x1, y2, pixel32);
			gdi_SetPixel_32bpp(bmp, x2, y2, pixel32);
		}
		else if (bpp == 16)
		{
			gdi_SetPixel_16bpp(bmp, x2, y1, pixel16);
			gdi_SetPixel_16bpp(bmp, x1, y1, pixel16);
			gdi_SetPixel_16bpp(bmp, x1, y2, pixel16);
			gdi_SetPixel_16bpp(bmp, x2, y2, pixel16);
		}
		else if (bpp == 8)
		{
			for (i = x1; i < x2; i++)
			{
				gdi_SetPixel_8bpp(bmp, i, y1, pixel8);
				gdi_SetPixel_8bpp(bmp, i, y2, pixel8);
			}

			for (i = y1; i < y2; i++)
			{
				gdi_SetPixel_8bpp(bmp, x1, i, pixel8);
				gdi_SetPixel_8bpp(bmp, x2, i, pixel8);
			}
		}

		e2 = 2 * e;

		if (e2 >= dx)
		{
			x1++;
			x2--;
			e += dx += c;
		}

		if (e2 <= dy)
		{
			y1++;
			y2--;
			e += dy += a;
		}
	}
	while (x1 <= x2);

	while (y1 - y2 < b)
	{
		if (bpp == 32)
		{
			gdi_SetPixel_32bpp(bmp, x1 - 1, ++y1, pixel32);
			gdi_SetPixel_32bpp(bmp, x1 - 1, --y2, pixel32);
		}
		else if (bpp == 16)
		{
			gdi_SetPixel_16bpp(bmp, x1 - 1, ++y1, pixel16);
			gdi_SetPixel_16bpp(bmp, x1 - 1, --y2, pixel16);
		}
		else if (bpp == 8)
		{
			gdi_SetPixel_8bpp(bmp, x1 - 1, ++y1, pixel8);
			gdi_SetPixel_8bpp(bmp, x1 - 1, --y2, pixel8);
		}
	}
}

/**
 * Draw an ellipse
 * @param hdc device context
 * @param nLeftRect x1
 * @param nTopRect y1
 * @param nRightRect x2
 * @param nBottomRect y2
 * @return
 */
int gdi_Ellipse(HGDI_DC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect)
{
	Ellipse_Bresenham(hdc, nLeftRect, nTopRect, nRightRect, nBottomRect);
	return 1;
}

/**
 * Fill a rectangle with the given brush.\n
 * @msdn{dd162719}
 * @param hdc device context
 * @param rect rectangle
 * @param hbr brush
 * @return 1 if successful, 0 otherwise
 */

int gdi_FillRect(HGDI_DC hdc, HGDI_RECT rect, HGDI_BRUSH hbr)
{
	pFillRect _FillRect = FillRect_[IBPP(hdc->bitsPerPixel)];

	if (_FillRect != NULL)
		return _FillRect(hdc, rect, hbr);
	else
		return 0;
}

/**
 *
 * @param hdc device context
 * @param lpPoints array of points
 * @param nCount number of points
 * @return
 */
int gdi_Polygon(HGDI_DC hdc, GDI_POINT *lpPoints, int nCount)
{
	return 1;
}

/**
 * Draw a series of closed polygons
 * @param hdc device context
 * @param lpPoints array of series of points
 * @param lpPolyCounts array of number of points in each series
 * @param nCount count of number of points in lpPolyCounts
 * @return
 */
int gdi_PolyPolygon(HGDI_DC hdc, GDI_POINT *lpPoints, int *lpPolyCounts, int nCount)
{
	return 1;
}

/**
 * Draw a rectangle
 * @param hdc device context
 * @param nLeftRect x1
 * @param nTopRect y1
 * @param nRightRect x2
 * @param nBottomRect y2
 * @return
 */
int gdi_Rectangle(HGDI_DC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect)
{
	return 1;
}