gdkcursor-win32.c

linux下电话本所依赖的一些图形库

  g_return_if_fail (cursor != NULL);
  private = (GdkCursorPrivate *) cursor;

  GDK_NOTE (MISC, g_print ("_gdk_cursor_destroy: %p\n",
			   (cursor->type == GDK_CURSOR_IS_PIXMAP) ? private->hcursor : 0));

  if (GetCursor () == private->hcursor)
    SetCursor (NULL);

  if (!DestroyCursor (private->hcursor))
    WIN32_API_FAILED ("DestroyCursor");

  g_free (private);
}

GdkDisplay *
gdk_cursor_get_display (GdkCursor *cursor)
{
  return gdk_display_get_default ();
}

GdkCursor *
gdk_cursor_new_from_pixbuf (GdkDisplay *display, 
			    GdkPixbuf  *pixbuf,
			    gint        x,
			    gint        y)
{
  HCURSOR hcursor;

  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
  g_return_val_if_fail (0 <= x && x < gdk_pixbuf_get_width (pixbuf), NULL);
  g_return_val_if_fail (0 <= y && y < gdk_pixbuf_get_height (pixbuf), NULL);

  hcursor = _gdk_win32_pixbuf_to_hcursor (pixbuf, x, y);
  if (!hcursor)
    return NULL;
  return _gdk_win32_cursor_new_from_hcursor (hcursor, GDK_CURSOR_IS_PIXMAP);
}

gboolean 
gdk_display_supports_cursor_alpha (GdkDisplay    *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);

  return _gdk_win32_pixbuf_to_hicon_supports_alpha ();
}

gboolean 
gdk_display_supports_cursor_color (GdkDisplay    *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);

  return TRUE;
}

guint     
gdk_display_get_default_cursor_size (GdkDisplay    *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), 0);
  
  return MIN (GetSystemMetrics (SM_CXCURSOR), GetSystemMetrics (SM_CYCURSOR));
}

void     
gdk_display_get_maximal_cursor_size (GdkDisplay *display,
				     guint       *width,
				     guint       *height)
{
  g_return_if_fail (GDK_IS_DISPLAY (display));
  
  if (width)
    *width = GetSystemMetrics (SM_CXCURSOR);
  if (height)
    *height = GetSystemMetrics (SM_CYCURSOR);
}


/* Convert a pixbuf to an HICON (or HCURSOR).  Supports alpha under
 * Windows XP, thresholds alpha otherwise.  Also used from
 * gdkwindow-win32.c for creating application icons.
 */

static HBITMAP
create_alpha_bitmap (gint width, gint height, guchar **outdata)
{
  BITMAPV5HEADER bi;
  HDC hdc;
  HBITMAP hBitmap;

  ZeroMemory (&bi, sizeof (BITMAPV5HEADER));
  bi.bV5Size = sizeof (BITMAPV5HEADER);
  bi.bV5Width = width;
  bi.bV5Height = height;
  bi.bV5Planes = 1;
  bi.bV5BitCount = 32;
  bi.bV5Compression = BI_BITFIELDS;
  /* The following mask specification specifies a supported 32 BPP
   * alpha format for Windows XP (BGRA format).
   */
  bi.bV5RedMask   = 0x00FF0000;
  bi.bV5GreenMask = 0x0000FF00;
  bi.bV5BlueMask  = 0x000000FF;
  bi.bV5AlphaMask = 0xFF000000;

  /* Create the DIB section with an alpha channel. */
  hdc = GetDC (NULL);
  if (!hdc)
    {
      WIN32_GDI_FAILED ("GetDC");
      return NULL;
    }
  hBitmap = CreateDIBSection (hdc, (BITMAPINFO *)&bi, DIB_RGB_COLORS,
			      (PVOID *) outdata, NULL, (DWORD)0);
  if (hBitmap == NULL)
    WIN32_GDI_FAILED ("CreateDIBSection");
  ReleaseDC (NULL, hdc);

  return hBitmap;
}

static HBITMAP
create_color_bitmap (gint width, gint height, guchar **outdata)
{
  BITMAPV4HEADER bi;
  HDC hdc;
  HBITMAP hBitmap;

  ZeroMemory (&bi, sizeof (BITMAPV4HEADER));
  bi.bV4Size = sizeof (BITMAPV4HEADER);
  bi.bV4Width = width;
  bi.bV4Height = height;
  bi.bV4Planes = 1;
  bi.bV4BitCount = 24;
  bi.bV4V4Compression = BI_RGB;

  hdc = GetDC (NULL);
  if (!hdc)
    {
      WIN32_GDI_FAILED ("GetDC");
      return NULL;
    }
  hBitmap = CreateDIBSection (hdc, (BITMAPINFO *)&bi, DIB_RGB_COLORS,
			      (PVOID *) outdata, NULL, (DWORD)0);
  if (hBitmap == NULL)
    WIN32_GDI_FAILED ("CreateDIBSection");
  ReleaseDC (NULL, hdc);

  return hBitmap;
}

static gboolean
pixbuf_to_hbitmaps_alpha_winxp (GdkPixbuf *pixbuf,
				HBITMAP   *color,
				HBITMAP   *mask)
{
  /* Based on code from
   * http://www.dotnet247.com/247reference/msgs/13/66301.aspx
   */
  HBITMAP hColorBitmap, hMaskBitmap;
  guchar *indata, *inrow;
  guchar *outdata, *outrow;
  gint width, height, i, j, rowstride;

  width = gdk_pixbuf_get_width (pixbuf); /* width of icon */
  height = gdk_pixbuf_get_height (pixbuf); /* height of icon */

  hColorBitmap = create_alpha_bitmap (width, height, &outdata);
  if (!hColorBitmap)
    return FALSE;
  hMaskBitmap = CreateBitmap (width, height, 1, 1, NULL);
  if (!hMaskBitmap)
    {
      DeleteObject (hColorBitmap);
      return FALSE;
    }

  /* rows are always aligned on 4-byte boundarys, but here our pixels are always 4 bytes */
  indata = gdk_pixbuf_get_pixels (pixbuf);
  rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  for (j=0; j<height; j++)
    {
      outrow = outdata + 4*j*width;
      inrow  = indata  + (height-j-1)*rowstride;
      for (i=0; i<width; i++)
	{
	  outrow[4*i+0] = inrow[4*i+2];
	  outrow[4*i+1] = inrow[4*i+1];
	  outrow[4*i+2] = inrow[4*i+0];
	  outrow[4*i+3] = inrow[4*i+3];
	}
    }

  if (color) *color = hColorBitmap;
  if (mask) *mask = hMaskBitmap;

  return TRUE;
}

static gboolean
pixbuf_to_hbitmaps_normal (GdkPixbuf *pixbuf,
			   HBITMAP   *color,
			   HBITMAP   *mask)
{
  /* Based on code from
   * http://www.dotnet247.com/247reference/msgs/13/66301.aspx
   */
  HBITMAP hColorBitmap, hMaskBitmap;
  guchar *indata, *inrow;
  guchar *colordata, *colorrow, *maskdata, *maskrow;
  gint width, height, i, j, rowstride, nc, bmstride;
  gboolean has_alpha;

  width = gdk_pixbuf_get_width (pixbuf); /* width of icon */
  height = gdk_pixbuf_get_height (pixbuf); /* height of icon */

  hColorBitmap = create_color_bitmap (width, height, &colordata);
  if (!hColorBitmap)
    return FALSE;
  hMaskBitmap  = create_color_bitmap (width, height, &maskdata);
  if (!hMaskBitmap)
    {
      DeleteObject (hColorBitmap);
      return FALSE;
    }

  /* rows are always aligned on 4-byte boundarys */
  bmstride = width * 3;
  if (bmstride % 4 != 0)
    bmstride += 4 - (bmstride % 4);

  indata = gdk_pixbuf_get_pixels (pixbuf);
  rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  nc = gdk_pixbuf_get_n_channels (pixbuf);
  has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);

  for (j=0; j<height; j++)
    {
      colorrow = colordata + j*bmstride;
      maskrow = maskdata + j*bmstride;
      inrow  = indata  + (height-j-1)*rowstride;
      for (i=0; i<width; i++)
	{
	  if (has_alpha && inrow[nc*i+3] < 128)
	    {
	      colorrow[3*i+0] = colorrow[3*i+1] = colorrow[3*i+2] = 0;
	      maskrow[3*i+0] = maskrow[3*i+1] = maskrow[3*i+2] = 255;
	    }
	  else
	    {
	      colorrow[3*i+0] = inrow[nc*i+2];
	      colorrow[3*i+1] = inrow[nc*i+1];
	      colorrow[3*i+2] = inrow[nc*i+0];
	      maskrow[3*i+0] = maskrow[3*i+1] = maskrow[3*i+2] = 0;
	    }
	}
    }

  if (color) *color = hColorBitmap;
  if (mask) *mask = hMaskBitmap;

  return TRUE;
}

static HICON
pixbuf_to_hicon (GdkPixbuf *pixbuf,
		 gboolean   is_icon,
		 gint       x,
		 gint       y)
{
  ICONINFO ii;
  HICON icon;
  gboolean success;

  if (pixbuf == NULL)
    return NULL;

  if (_gdk_win32_pixbuf_to_hicon_supports_alpha() && gdk_pixbuf_get_has_alpha (pixbuf))
    success = pixbuf_to_hbitmaps_alpha_winxp (pixbuf, &ii.hbmColor, &ii.hbmMask);
  else
    success = pixbuf_to_hbitmaps_normal (pixbuf, &ii.hbmColor, &ii.hbmMask);

  if (!success)
    return NULL;

  ii.fIcon = is_icon;
  ii.xHotspot = x;
  ii.yHotspot = y;
  icon = CreateIconIndirect (&ii);
  DeleteObject (ii.hbmColor);
  DeleteObject (ii.hbmMask);
  return icon;
}

HICON
_gdk_win32_pixbuf_to_hicon (GdkPixbuf *pixbuf)
{
  return pixbuf_to_hicon (pixbuf, TRUE, 0, 0);
}

HICON
_gdk_win32_pixbuf_to_hcursor (GdkPixbuf *pixbuf,
			      gint       x_hotspot,
			      gint       y_hotspot)
{
  return pixbuf_to_hicon (pixbuf, FALSE, x_hotspot, y_hotspot);
}

gboolean
_gdk_win32_pixbuf_to_hicon_supports_alpha (void)
{
  static gboolean is_win_xp=FALSE, is_win_xp_checked=FALSE;

  if (!is_win_xp_checked)
    {
      OSVERSIONINFO version;

      is_win_xp_checked = TRUE;
      memset (&version, 0, sizeof (version));
      version.dwOSVersionInfoSize = sizeof (version);
      is_win_xp = GetVersionEx (&version)
	&& version.dwPlatformId == VER_PLATFORM_WIN32_NT
	&& (version.dwMajorVersion > 5
	    || (version.dwMajorVersion == 5 && version.dwMinorVersion >= 1));
    }
  return is_win_xp;
}