dc.c

/*
 * FreeRDP: A Remote Desktop Protocol Implementation
 * GDI Device Context 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.
 */
 
/* Device Context Functions: http://msdn.microsoft.com/en-us/library/dd183554 */
 
#include <freerdp/config.h>
 
#include <stdio.h>
#include <stdlib.h>
 
#include <freerdp/freerdp.h>
#include <freerdp/gdi/gdi.h>
 
#include <freerdp/gdi/region.h>
 
#include <freerdp/gdi/dc.h>
 
HGDI_DC gdi_GetDC(void)
{
  HGDI_DC hDC = (HGDI_DC)calloc(1, sizeof(GDI_DC));
 
  if (!hDC)
    return NULL;
 
  hDC->format = PIXEL_FORMAT_XRGB32;
  hDC->drawMode = GDI_R2_BLACK;
  hDC->clip = gdi_CreateRectRgn(0, 0, 0, 0);
 
  if (!hDC->clip)
  {
    free(hDC);
    return NULL;
  }
 
  hDC->clip->null = TRUE;
  hDC->hwnd = NULL;
  return hDC;
}
 
HGDI_DC gdi_CreateDC(UINT32 format)
{
  HGDI_DC hDC = NULL;
 
  if (!(hDC = (HGDI_DC)calloc(1, sizeof(GDI_DC))))
    return NULL;
 
  hDC->drawMode = GDI_R2_BLACK;
 
  if (!(hDC->clip = gdi_CreateRectRgn(0, 0, 0, 0)))
    goto fail;
 
  hDC->clip->null = TRUE;
  hDC->hwnd = NULL;
  hDC->format = format;
 
  if (!(hDC->hwnd = (HGDI_WND)calloc(1, sizeof(GDI_WND))))
    goto fail;
 
  if (!(hDC->hwnd->invalid = gdi_CreateRectRgn(0, 0, 0, 0)))
    goto fail;
 
  hDC->hwnd->invalid->null = TRUE;
  hDC->hwnd->count = 32;
 
  if (!(hDC->hwnd->cinvalid = (HGDI_RGN)calloc(hDC->hwnd->count, sizeof(GDI_RGN))))
    goto fail;
 
  hDC->hwnd->ninvalid = 0;
  return hDC;
fail:
  gdi_DeleteDC(hDC);
  return NULL;
}
 
HGDI_DC gdi_CreateCompatibleDC(HGDI_DC hdc)
{
  HGDI_DC hDC = (HGDI_DC)calloc(1, sizeof(GDI_DC));
 
  if (!hDC)
    return NULL;
 
  if (!(hDC->clip = gdi_CreateRectRgn(0, 0, 0, 0)))
  {
    free(hDC);
    return NULL;
  }
 
  hDC->clip->null = TRUE;
  hDC->format = hdc->format;
  hDC->drawMode = hdc->drawMode;
  hDC->hwnd = NULL;
  return hDC;
}
 
HGDIOBJECT gdi_SelectObject(HGDI_DC hdc, HGDIOBJECT hgdiobject)
{
  HGDIOBJECT previousSelectedObject = hdc->selectedObject;
 
  if (hgdiobject == NULL)
    return NULL;
 
  if (hgdiobject->objectType == GDIOBJECT_BITMAP)
  {
    hdc->selectedObject = hgdiobject;
  }
  else if (hgdiobject->objectType == GDIOBJECT_PEN)
  {
    previousSelectedObject = (HGDIOBJECT)hdc->pen;
    hdc->pen = (HGDI_PEN)hgdiobject;
  }
  else if (hgdiobject->objectType == GDIOBJECT_BRUSH)
  {
    previousSelectedObject = (HGDIOBJECT)hdc->brush;
    hdc->brush = (HGDI_BRUSH)hgdiobject;
  }
  else if (hgdiobject->objectType == GDIOBJECT_REGION)
  {
    hdc->selectedObject = hgdiobject;
    previousSelectedObject = (HGDIOBJECT)COMPLEXREGION;
  }
  else if (hgdiobject->objectType == GDIOBJECT_RECT)
  {
    hdc->selectedObject = hgdiobject;
    previousSelectedObject = (HGDIOBJECT)SIMPLEREGION;
  }
  else
  {
    /* Unknown GDI Object Type */
    return NULL;
  }
 
  return previousSelectedObject;
}
 
BOOL gdi_DeleteObject(HGDIOBJECT hgdiobject)
{
  if (!hgdiobject)
    return FALSE;
 
  if (hgdiobject->objectType == GDIOBJECT_BITMAP)
  {
    HGDI_BITMAP hBitmap = (HGDI_BITMAP)hgdiobject;
 
    if (hBitmap->data && hBitmap->free)
    {
      hBitmap->free(hBitmap->data);
      hBitmap->data = NULL;
    }
 
    free(hBitmap);
  }
  else if (hgdiobject->objectType == GDIOBJECT_PEN)
  {
    HGDI_PEN hPen = (HGDI_PEN)hgdiobject;
    free(hPen);
  }
  else if (hgdiobject->objectType == GDIOBJECT_BRUSH)
  {
    HGDI_BRUSH hBrush = (HGDI_BRUSH)hgdiobject;
    free(hBrush);
  }
  else if (hgdiobject->objectType == GDIOBJECT_REGION)
  {
    free(hgdiobject);
  }
  else if (hgdiobject->objectType == GDIOBJECT_RECT)
  {
    free(hgdiobject);
  }
  else
  {
    /* Unknown GDI Object Type */
    free(hgdiobject);
    return FALSE;
  }
 
  return TRUE;
}
 
BOOL gdi_DeleteDC(HGDI_DC hdc)
{
  if (hdc)
  {
    if (hdc->hwnd)
    {
      free(hdc->hwnd->cinvalid);
      free(hdc->hwnd->invalid);
      free(hdc->hwnd);
    }
 
    free(hdc->clip);
    free(hdc);
  }
 
  return TRUE;
}