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* FreeRDP: A Remote Desktop Protocol Client
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* Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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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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* http://www.apache.org/licenses/LICENSE-2.0
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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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#include <freerdp/api.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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* Create a region from rectangular coordinates.\n
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* @param nRightRect x2
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* @param nBottomRect y2
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HGDI_RGN gdi_CreateRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect)
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HGDI_RGN hRgn = (HGDI_RGN) malloc(sizeof(GDI_RGN));
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hRgn->objectType = GDIOBJECT_REGION;
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hRgn->w = nRightRect - nLeftRect + 1;
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hRgn->h = nBottomRect - nTopRect + 1;
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* Create a new rectangle.
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* @return new rectangle
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HGDI_RECT gdi_CreateRect(int xLeft, int yTop, int xRight, int yBottom)
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HGDI_RECT hRect = (HGDI_RECT) malloc(sizeof(GDI_RECT));
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hRect->objectType = GDIOBJECT_RECT;
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hRect->right = xRight;
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hRect->bottom = yBottom;
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* Convert a rectangle to a region.
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* @param rect source rectangle
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* @param rgn destination region
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INLINE void gdi_RectToRgn(HGDI_RECT rect, HGDI_RGN rgn)
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rgn->w = rect->right - rect->left + 1;
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rgn->h = rect->bottom - rect->top + 1;
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* Convert rectangular coordinates to a region.
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* @param rgn destination region
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INLINE void gdi_CRectToRgn(int left, int top, int right, int bottom, HGDI_RGN rgn)
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rgn->w = right - left + 1;
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rgn->h = bottom - top + 1;
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* Convert a rectangle to region coordinates.
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* @param rect source rectangle
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INLINE void gdi_RectToCRgn(HGDI_RECT rect, int *x, int *y, int *w, int *h)
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*w = rect->right - rect->left + 1;
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*h = rect->bottom - rect->top + 1;
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* Convert rectangular coordinates to region coordinates.
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INLINE void gdi_CRectToCRgn(int left, int top, int right, int bottom, int *x, int *y, int *w, int *h)
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*w = right - left + 1;
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*h = bottom - top + 1;
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* Convert a region to a rectangle.
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* @param rgn source region
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* @param rect destination rectangle
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INLINE void gdi_RgnToRect(HGDI_RGN rgn, HGDI_RECT rect)
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rect->right = rgn->x + rgn->w - 1;
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rect->bottom = rgn->y + rgn->h - 1;
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* Convert region coordinates to a rectangle.
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* @param rect destination rectangle
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INLINE void gdi_CRgnToRect(int x, int y, int w, int h, HGDI_RECT rect)
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rect->right = x + w - 1;
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rect->bottom = y + h - 1;
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* Convert a region to rectangular coordinates.
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* @param rgn source region
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INLINE void gdi_RgnToCRect(HGDI_RGN rgn, int *left, int *top, int *right, int *bottom)
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*right = rgn->x + rgn->w - 1;
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*bottom = rgn->y + rgn->h - 1;
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* Convert region coordinates to rectangular coordinates.
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INLINE void gdi_CRgnToCRect(int x, int y, int w, int h, int *left, int *top, int *right, int *bottom)
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* Check if copying would involve overlapping regions
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* @param height height
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* @param srcx source x1
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* @param srcy source y1
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* @return 1 if there is an overlap, 0 otherwise
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INLINE int gdi_CopyOverlap(int x, int y, int width, int height, int srcx, int srcy)
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gdi_CRgnToRect(x, y, width, height, &dst);
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gdi_CRgnToRect(srcx, srcy, width, height, &src);
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return (dst.right > src.left && dst.left < src.right &&
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dst.bottom > src.top && dst.top < src.bottom) ? 1 : 0;
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* Set the coordinates of a given rectangle.\n
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* @param rc rectangle
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* @return 1 if successful, 0 otherwise
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INLINE int gdi_SetRect(HGDI_RECT rc, int xLeft, int yTop, int xRight, int yBottom)
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rc->bottom = yBottom;
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* Set the coordinates of a given region.
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* @param nWidth width
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* @param nHeight height
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INLINE int gdi_SetRgn(HGDI_RGN hRgn, int nXLeft, int nYLeft, int nWidth, int nHeight)
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* Convert rectangular coordinates to a region
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* @param hRgn destination region
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* @param nLeftRect x1
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* @param nRightRect x2
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* @param nBottomRect y2
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INLINE int gdi_SetRectRgn(HGDI_RGN hRgn, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect)
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gdi_CRectToRgn(nLeftRect, nTopRect, nRightRect, nBottomRect, hRgn);
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* Compare two regions for equality.\n
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* @param hSrcRgn1 first region
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* @param hSrcRgn2 second region
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* @return 1 if both regions are equal, 0 otherwise
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INLINE int gdi_EqualRgn(HGDI_RGN hSrcRgn1, HGDI_RGN hSrcRgn2)
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if ((hSrcRgn1->x == hSrcRgn2->x) &&
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(hSrcRgn1->y == hSrcRgn2->y) &&
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(hSrcRgn1->w == hSrcRgn2->w) &&
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(hSrcRgn1->h == hSrcRgn2->h))
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* Copy coordinates from a rectangle to another rectangle
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* @param dst destination rectangle
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* @param src source rectangle
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* @return 1 if successful, 0 otherwise
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INLINE int gdi_CopyRect(HGDI_RECT dst, HGDI_RECT src)
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dst->left = src->left;
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dst->right = src->right;
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dst->bottom = src->bottom;
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* Check if a point is inside a rectangle.\n
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* @param rc rectangle
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* @param x point x position
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* @param y point y position
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* @return 1 if the point is inside, 0 otherwise
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INLINE int gdi_PtInRect(HGDI_RECT rc, int x, int y)
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* points on the left and top sides are considered in,
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* while points on the right and bottom sides are considered out
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if (x >= rc->left && x <= rc->right)
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if (y >= rc->top && y <= rc->bottom)
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* Invalidate a given region, such that it is redrawn on the next region update.\n
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* @param hdc device context
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INLINE int gdi_InvalidateRegion(HGDI_DC hdc, int x, int y, int w, int h)
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if (hdc->hwnd == NULL)
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if (hdc->hwnd->invalid == NULL)
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cinvalid = hdc->hwnd->cinvalid;
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if (hdc->hwnd->ninvalid + 1 > hdc->hwnd->count)
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hdc->hwnd->count *= 2;
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cinvalid = (HGDI_RGN) realloc(cinvalid, sizeof(GDI_RGN) * (hdc->hwnd->count));
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gdi_SetRgn(&cinvalid[hdc->hwnd->ninvalid++], x, y, w, h);
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hdc->hwnd->cinvalid = cinvalid;
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invalid = hdc->hwnd->invalid;
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gdi_CRgnToRect(x, y, w, h, &rgn);
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gdi_RgnToRect(invalid, &inv);
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if (rgn.left < inv.left)
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if (rgn.top < inv.top)
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if (rgn.right > inv.right)
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inv.right = rgn.right;
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if (rgn.bottom > inv.bottom)
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inv.bottom = rgn.bottom;
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gdi_RectToRgn(&inv, invalid);