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Diffstat (limited to 'libfreerdp/gdi/clipping.c')
| -rw-r--r-- | libfreerdp/gdi/clipping.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/libfreerdp/gdi/clipping.c b/libfreerdp/gdi/clipping.c new file mode 100644 index 0000000..45774b6 --- /dev/null +++ b/libfreerdp/gdi/clipping.c @@ -0,0 +1,164 @@ +/** + * 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. + */ + +#include <freerdp/config.h> + +#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. + * 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 = NULL; + 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; +} |