clipping.c

 
#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);
}
 
GDI_RGN* gdi_GetClipRgn(HGDI_DC hdc)
{
  return hdc->clip;
}
 
BOOL gdi_SetNullClipRgn(HGDI_DC hdc)
{
  if (!gdi_SetClipRgn(hdc, 0, 0, 0, 0))
    return FALSE;
  hdc->clip->null = TRUE;
  return TRUE;
}
 
BOOL gdi_ClipCoords(HGDI_DC hdc, INT32* x, INT32* y, INT32* w, INT32* h, INT32* srcx, INT32* srcy)
{
  GDI_RECT bmp = WINPR_C_ARRAY_INIT;
  GDI_RECT clip = WINPR_C_ARRAY_INIT;
  GDI_RECT coords = WINPR_C_ARRAY_INIT;
  int dx = 0;
  int dy = 0;
  BOOL draw = TRUE;
 
  if (hdc == nullptr)
    return FALSE;
 
  HGDI_BITMAP hBmp = (HGDI_BITMAP)hdc->selectedObject;
 
  if (hBmp != nullptr)
  {
    if (hdc->clip->null)
    {
      if (!gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &clip))
        return TRUE;
    }
    else
    {
      if (!gdi_RgnToRect(hdc->clip, &clip))
        return TRUE;
      if (!gdi_CRgnToRect(0, 0, hBmp->width, hBmp->height, &bmp))
        return TRUE;
 
      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
  {
    if (!gdi_RgnToRect(hdc->clip, &clip))
      return TRUE;
  }
 
  if (!gdi_CRgnToRect(*x, *y, *w, *h, &coords))
    return TRUE;
 
  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 != nullptr)
    *srcx += dx;
 
  if (srcy != nullptr)
    *srcy += dy;
 
  if (!gdi_RectToCRgn(&coords, x, y, w, h))
    return FALSE;
  return draw;
}