mirror of https://github.com/FreeRDP/FreeRDP
168 lines
3.5 KiB
C
168 lines
3.5 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* GDI Clipping Functions
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*
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* Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Copyright 2016 Armin Novak <armin.novak@thincast.com>
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* Copyright 2016 Thincast Technologies GmbH
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <freerdp/freerdp.h>
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#include <freerdp/gdi/gdi.h>
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#include <freerdp/gdi/region.h>
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#include "clipping.h"
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BOOL gdi_SetClipRgn(HGDI_DC hdc, UINT32 nXLeft, UINT32 nYLeft, UINT32 nWidth,
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UINT32 nHeight)
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{
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return gdi_SetRgn(hdc->clip, nXLeft, nYLeft, nWidth, nHeight);
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}
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/**
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* Get the current clipping region.\n
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* @msdn{dd144866}
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* @param hdc device context
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* @return clipping region
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*/
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HGDI_RGN gdi_GetClipRgn(HGDI_DC hdc)
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{
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return hdc->clip;
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}
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/**
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* Set the current clipping region to null.
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* @param hdc device context
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* @return nonzero on success, 0 otherwise
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*/
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BOOL gdi_SetNullClipRgn(HGDI_DC hdc)
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{
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gdi_SetClipRgn(hdc, 0, 0, 0, 0);
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hdc->clip->null = TRUE;
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return TRUE;
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}
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/**
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* Clip coordinates according to clipping region
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* @param hdc device context
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* @param x x1
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* @param y y1
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* @param w width
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* @param h height
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* @param srcx source x1
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* @param srcy source y1
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* @return nonzero if there is something to draw, 0 otherwise
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*/
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BOOL gdi_ClipCoords(HGDI_DC hdc, UINT32* x, UINT32* y, UINT32* w, UINT32* h,
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UINT32* srcx, UINT32* srcy)
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{
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GDI_RECT bmp;
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GDI_RECT clip;
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GDI_RECT coords;
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HGDI_BITMAP hBmp;
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int dx = 0;
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int dy = 0;
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BOOL draw = TRUE;
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if (hdc == NULL)
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return FALSE;
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hBmp = (HGDI_BITMAP) hdc->selectedObject;
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if (hBmp != NULL)
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{
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if (hdc->clip->null)
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{
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gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &clip);
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}
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else
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{
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gdi_RgnToRect(hdc->clip, &clip);
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gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &bmp);
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if (clip.left < bmp.left)
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clip.left = bmp.left;
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if (clip.right > bmp.right)
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clip.right = bmp.right;
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if (clip.top < bmp.top)
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clip.top = bmp.top;
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if (clip.bottom > bmp.bottom)
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clip.bottom = bmp.bottom;
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}
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}
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else
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{
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gdi_RgnToRect(hdc->clip, &clip);
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}
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gdi_CRgnToRect(*x, *y, *w, *h, &coords);
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if (coords.right >= clip.left && coords.left <= clip.right &&
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coords.bottom >= clip.top && coords.top <= clip.bottom)
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{
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/* coordinates overlap with clipping region */
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if (coords.left < clip.left)
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{
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dx = (clip.left - coords.left);
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coords.left = clip.left;
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}
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if (coords.right > clip.right)
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coords.right = clip.right;
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if (coords.top < clip.top)
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{
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dy = (clip.top - coords.top);
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coords.top = clip.top;
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}
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if (coords.bottom > clip.bottom)
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coords.bottom = clip.bottom;
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}
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else
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{
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/* coordinates do not overlap with clipping region */
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coords.left = 0;
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coords.right = 0;
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coords.top = 0;
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coords.bottom = 0;
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draw = FALSE;
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}
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if (srcx != NULL)
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*srcx += dx;
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if (srcy != NULL)
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*srcy += dy;
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gdi_RectToCRgn(&coords, x, y, w, h);
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return draw;
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}
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