168 lines
3.5 KiB
C
168 lines
3.5 KiB
C
/**
|
|
* 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, UINT32 nXLeft, UINT32 nYLeft, UINT32 nWidth,
|
|
UINT32 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, UINT32* x, UINT32* y, UINT32* w, UINT32* h,
|
|
UINT32* srcx, UINT32* 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;
|
|
}
|