gdkgc-win32.c

linux下电话本所依赖的一些图形库

/**
 * gdk_win32_hdc_get:
 * @drawable: destination #GdkDrawable
 * @gc: #GdkGC to use for drawing on @drawable
 * @usage: mask indicating what properties needs to be set up
 *
 * Allocates a Windows device context handle (HDC) for drawing into
 * @drawable, and sets it up appropriately according to @usage.
 *
 * Each #GdkGC can at one time have only one HDC associated with it.
 *
 * The following flags in @mask are handled:
 *
 * If %GDK_GC_FOREGROUND is set in @mask, a solid brush of the
 * foreground color in @gc is selected into the HDC. The text color of
 * the HDC is also set. If the @drawable has a palette (256-color
 * mode), the palette is selected and realized.
 *
 * If any of the line attribute flags (%GDK_GC_LINE_WIDTH,
 * %GDK_GC_LINE_STYLE, %GDK_GC_CAP_STYLE and %GDK_GC_JOIN_STYLE) is
 * set in @mask, a solid pen of the foreground color and appropriate
 * width and stule is created and selected into the HDC. Note that the
 * dash properties are not completely implemented.
 *
 * If the %GDK_GC_FONT flag is set, the background mix mode is set to
 * %TRANSPARENT. and the text alignment is set to
 * %TA_BASELINE|%TA_LEFT. Note that no font gets selected into the HDC
 * by this function.
 *
 * Some things are done regardless of @mask: If the function in @gc is
 * any other than %GDK_COPY, the raster operation of the HDC is
 * set. If @gc has a clip mask, the clip region of the HDC is set.
 *
 * Note that the fill style, tile, stipple, and tile and stipple
 * origins in the @gc are ignored by this function. (In general, tiles
 * and stipples can't be implemented directly on Win32; you need to do
 * multiple pass drawing and blitting to implement tiles or
 * stipples. GDK does just that when you call the GDK drawing
 * functions with a GC that asks for tiles or stipples.)
 *
 * When the HDC is no longer used, it should be released by calling
 * <function>gdk_win32_hdc_release()</function> with the same
 * parameters.
 *
 * If you modify the HDC by calling <function>SelectObject</function>
 * you should undo those modifications before calling
 * <function>gdk_win32_hdc_release()</function>.
 *
 * Return value: The HDC.
 **/
HDC
gdk_win32_hdc_get (GdkDrawable    *drawable,
		   GdkGC          *gc,
		   GdkGCValuesMask usage)
{
  GdkGCWin32 *win32_gc = (GdkGCWin32 *) gc;
  GdkDrawableImplWin32 *impl = NULL;
  gboolean ok = TRUE;
  COLORREF fg = RGB (0, 0, 0), bg = RGB (255, 255, 255);
  HPEN hpen;
  HBRUSH hbr;

  g_assert (win32_gc->hdc == NULL);

  if (GDK_IS_DRAWABLE_IMPL_WIN32 (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32(drawable);
  else if (GDK_IS_WINDOW (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32 ((GDK_WINDOW_OBJECT (drawable))->impl);
  else if (GDK_IS_PIXMAP (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32 ((GDK_PIXMAP_OBJECT (drawable))->impl);
  else
    g_assert_not_reached ();

  win32_gc->hwnd = impl->handle;

  if (GDK_IS_PIXMAP_IMPL_WIN32 (impl))
    {
      if ((win32_gc->hdc = CreateCompatibleDC (NULL)) == NULL)
	WIN32_GDI_FAILED ("CreateCompatibleDC"), ok = FALSE;

      if (ok && (win32_gc->saved_dc = SaveDC (win32_gc->hdc)) == 0)
	WIN32_GDI_FAILED ("SaveDC"), ok = FALSE;
      
      if (ok && SelectObject (win32_gc->hdc, win32_gc->hwnd) == NULL)
	WIN32_GDI_FAILED ("SelectObject"), ok = FALSE;
    }
  else
    {
      if ((win32_gc->hdc = GetDC (win32_gc->hwnd)) == NULL)
	WIN32_GDI_FAILED ("GetDC");
      
      if (ok && (win32_gc->saved_dc = SaveDC (win32_gc->hdc)) == 0)
	WIN32_GDI_FAILED ("SaveDC");
    }

  if (ok && (usage & (GDK_GC_FOREGROUND | GDK_GC_BACKGROUND)))
      ok = predraw (gc, impl->colormap);

  if (ok && (usage & GDK_GC_FOREGROUND))
    {
      fg = _gdk_win32_colormap_color (impl->colormap, win32_gc->foreground);
      if ((hbr = CreateSolidBrush (fg)) == NULL)
	WIN32_GDI_FAILED ("CreateSolidBrush"), ok = FALSE;

      if (ok && SelectObject (win32_gc->hdc, hbr) == NULL)
	WIN32_GDI_FAILED ("SelectObject"), ok = FALSE;

      if (ok && SetTextColor (win32_gc->hdc, fg) == CLR_INVALID)
	WIN32_GDI_FAILED ("SetTextColor"), ok = FALSE;
    }

  if (ok && (usage & LINE_ATTRIBUTES))
    {
      /* For drawing GDK_LINE_DOUBLE_DASH */
      if ((usage & GDK_GC_BACKGROUND) && win32_gc->line_style == GDK_LINE_DOUBLE_DASH)
        {
          bg = _gdk_win32_colormap_color (impl->colormap, win32_gc->background);
          if ((win32_gc->pen_hbrbg = CreateSolidBrush (bg)) == NULL)
	    WIN32_GDI_FAILED ("CreateSolidBrush"), ok = FALSE;
        }

      if (ok)
        {
	  LOGBRUSH logbrush;
	  DWORD style_count = 0;
	  const DWORD *style = NULL;

	  /* Create and select pen */
	  logbrush.lbStyle = BS_SOLID;
	  logbrush.lbColor = fg;
	  logbrush.lbHatch = 0;

	  if ((win32_gc->pen_style & PS_STYLE_MASK) == PS_USERSTYLE)
	    {
	      style_count = win32_gc->pen_num_dashes;
	      style = win32_gc->pen_dashes;
	    }

	  if ((hpen = ExtCreatePen (win32_gc->pen_style,
				    MAX (win32_gc->pen_width, 1),
				    &logbrush, 
				    style_count, style)) == NULL)
	    WIN32_GDI_FAILED ("ExtCreatePen"), ok = FALSE;
	  
	  if (ok && SelectObject (win32_gc->hdc, hpen) == NULL)
	    WIN32_GDI_FAILED ("SelectObject"), ok = FALSE;
	}
    }

  if (ok && (usage & GDK_GC_FONT))
    {
      if (SetBkMode (win32_gc->hdc, TRANSPARENT) == 0)
	WIN32_GDI_FAILED ("SetBkMode"), ok = FALSE;
  
      if (ok && SetTextAlign (win32_gc->hdc, TA_BASELINE|TA_LEFT|TA_NOUPDATECP) == GDI_ERROR)
	WIN32_GDI_FAILED ("SetTextAlign"), ok = FALSE;
    }
  
  if (ok && win32_gc->rop2 != R2_COPYPEN)
    if (SetROP2 (win32_gc->hdc, win32_gc->rop2) == 0)
      WIN32_GDI_FAILED ("SetROP2"), ok = FALSE;

  if (ok &&
      (win32_gc->values_mask & GDK_GC_CLIP_MASK) &&
      win32_gc->hcliprgn != NULL)
    {
      if (SelectClipRgn (win32_gc->hdc, win32_gc->hcliprgn) == ERROR)
	WIN32_API_FAILED ("SelectClipRgn"), ok = FALSE;

      if (ok && win32_gc->values_mask & (GDK_GC_CLIP_X_ORIGIN | GDK_GC_CLIP_Y_ORIGIN) &&
	  OffsetClipRgn (win32_gc->hdc,
	    win32_gc->values_mask & GDK_GC_CLIP_X_ORIGIN ? gc->clip_x_origin : 0,
	    win32_gc->values_mask & GDK_GC_CLIP_Y_ORIGIN ? gc->clip_y_origin : 0) == ERROR)
	WIN32_API_FAILED ("OffsetClipRgn"), ok = FALSE;
    }

  GDK_NOTE (GC, (g_print ("gdk_win32_hdc_get: %p (%s): ",
			  win32_gc, _gdk_win32_gcvalues_mask_to_string (usage)),
		 _gdk_win32_print_dc (win32_gc->hdc)));

  return win32_gc->hdc;
}

/**
 * gdk_win32_hdc_release:
 * @drawable: destination #GdkDrawable
 * @gc: #GdkGC to use for drawing on @drawable
 * @usage: mask indicating what properties were set up
 *
 * This function deallocates the Windows device context allocated by
 * <funcion>gdk_win32_hdc_get()</function>. It should be called with
 * the same parameters.
 **/
void
gdk_win32_hdc_release (GdkDrawable    *drawable,
		       GdkGC          *gc,
		       GdkGCValuesMask usage)
{
  GdkGCWin32 *win32_gc = (GdkGCWin32 *) gc;
  GdkDrawableImplWin32 *impl = NULL;
  HGDIOBJ hpen = NULL;
  HGDIOBJ hbr = NULL;

  GDK_NOTE (GC, g_print ("gdk_win32_hdc_release: %p: %p (%s)\n",
			 win32_gc, win32_gc->hdc,
			 _gdk_win32_gcvalues_mask_to_string (usage)));

  if (GDK_IS_DRAWABLE_IMPL_WIN32 (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32(drawable);
  else if (GDK_IS_WINDOW (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32 ((GDK_WINDOW_OBJECT (drawable))->impl);
  else if (GDK_IS_PIXMAP (drawable))
    impl = GDK_DRAWABLE_IMPL_WIN32 ((GDK_PIXMAP_OBJECT (drawable))->impl);
  else
    g_assert_not_reached ();

  if (win32_gc->holdpal != NULL)
    {
      gint k;
      
      if (!SelectPalette (win32_gc->hdc, win32_gc->holdpal, FALSE))
	WIN32_GDI_FAILED ("SelectPalette");
      else if ((k = RealizePalette (win32_gc->hdc)) == GDI_ERROR)
	WIN32_GDI_FAILED ("RealizePalette");
      else if (k > 0)
	GDK_NOTE (COLORMAP, g_print ("gdk_win32_hdc_release: realized %p: %d colors\n",
				     win32_gc->holdpal, k));
      win32_gc->holdpal = NULL;
    }

  if (usage & LINE_ATTRIBUTES)
    if ((hpen = GetCurrentObject (win32_gc->hdc, OBJ_PEN)) == NULL)
      WIN32_GDI_FAILED ("GetCurrentObject");
  
  if (usage & GDK_GC_FOREGROUND)
    if ((hbr = GetCurrentObject (win32_gc->hdc, OBJ_BRUSH)) == NULL)
      WIN32_GDI_FAILED ("GetCurrentObject");

  GDI_CALL (RestoreDC, (win32_gc->hdc, win32_gc->saved_dc));

  if (GDK_IS_PIXMAP_IMPL_WIN32 (impl))
    GDI_CALL (DeleteDC, (win32_gc->hdc));
  else
    GDI_CALL (ReleaseDC, (win32_gc->hwnd, win32_gc->hdc));

  if (hpen != NULL)
    GDI_CALL (DeleteObject, (hpen));
  
  if (hbr != NULL)
    GDI_CALL (DeleteObject, (hbr));

  if (win32_gc->pen_hbrbg != NULL)
    GDI_CALL (DeleteObject, (win32_gc->pen_hbrbg));

  win32_gc->hdc = NULL;
}

/* This function originally from Jean-Edouard Lachand-Robert, and
 * available at www.codeguru.com. Simplified for our needs, not sure
 * how much of the original code left any longer. Now handles just
 * one-bit deep bitmaps (in Window parlance, ie those that GDK calls
 * bitmaps (and not pixmaps), with zero pixels being transparent.
 */

/* _gdk_win32_bitmap_to_hrgn : Create a region from the
 * "non-transparent" pixels of a bitmap.
 */

HRGN
_gdk_win32_bitmap_to_hrgn (GdkPixmap *pixmap)
{
  HRGN hRgn = NULL;
  HRGN h;
  DWORD maxRects;
  RGNDATA *pData;
  guchar *bits;
  gint width, height, bpl;
  guchar *p;
  gint x, y;

  g_assert (GDK_PIXMAP_OBJECT(pixmap)->depth == 1);

  bits = GDK_PIXMAP_IMPL_WIN32 (GDK_PIXMAP_OBJECT (pixmap)->impl)->bits;
  width = GDK_PIXMAP_IMPL_WIN32 (GDK_PIXMAP_OBJECT (pixmap)->impl)->width;
  height = GDK_PIXMAP_IMPL_WIN32 (GDK_PIXMAP_OBJECT (pixmap)->impl)->height;
  bpl = ((width - 1)/32 + 1)*4;

  /* For better performances, we will use the ExtCreateRegion()
   * function to create the region. This function take a RGNDATA
   * structure on entry. We will add rectangles by amount of
   * ALLOC_UNIT number in this structure.
   */
  #define ALLOC_UNIT  100
  maxRects = ALLOC_UNIT;

  pData = g_malloc (sizeof (RGNDATAHEADER) + (sizeof (RECT) * maxRects));
  pData->rdh.dwSize = sizeof (RGNDATAHEADER);
  pData->rdh.iType = RDH_RECTANGLES;
  pData->rdh.nCount = pData->rdh.nRgnSize = 0;
  SetRect (&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);

  for (y = 0; y < height; y++)
    {
      /* Scan each bitmap row from left to right*/
      p = (guchar *) bits + y * bpl;
      for (x = 0; x < width; x++)
	{
	  /* Search for a continuous range of "non transparent pixels"*/
	  gint x0 = x;
	  while (x < width)
	    {
	      if ((((p[x/8])>>(7-(x%8)))&1) == 0)
		/* This pixel is "transparent"*/
		break;
	      x++;
	    }
	  
	  if (x > x0)
	    {
	      RECT *pr;
	      /* Add the pixels (x0, y) to (x, y+1) as a new rectangle
	       * in the region
	       */
	      if (pData->rdh.nCount >= maxRects)
		{
		  maxRects += ALLOC_UNIT;
		  pData = g_realloc (pData, sizeof(RGNDATAHEADER)
				     + (sizeof(RECT) * maxRects));
		}
	      pr = (RECT *) &pData->Buffer;
	      SetRect (&pr[pData->rdh.nCount], x0, y, x, y+1);
	      if (x0 < pData->rdh.rcBound.left)
		pData->rdh.rcBound.left = x0;
	      if (y < pData->rdh.rcBound.top)
		pData->rdh.rcBound.top = y;
	      if (x > pData->rdh.rcBound.right)
		pData->rdh.rcBound.right = x;
	      if (y+1 > pData->rdh.rcBound.bottom)
		pData->rdh.rcBound.bottom = y+1;
	      pData->rdh.nCount++;
	      
	      /* On Windows98, ExtCreateRegion() may fail if the
	       * number of rectangles is too large (ie: >
	       * 4000). Therefore, we have to create the region by
	       * multiple steps.
	       */
	      if (pData->rdh.nCount == 2000)
		{
		  HRGN h = ExtCreateRegion (NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
		  if (hRgn)
		    {
		      CombineRgn(hRgn, hRgn, h, RGN_OR);
		      DeleteObject(h);
		    }
		  else
		    hRgn = h;
		  pData->rdh.nCount = 0;
		  SetRect (&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
		}
	    }
	}
    }
  
  /* Create or extend the region with the remaining rectangles*/
  h = ExtCreateRegion (NULL, sizeof (RGNDATAHEADER)
		       + (sizeof (RECT) * maxRects), pData);
  if (hRgn)
    {
      CombineRgn (hRgn, hRgn, h, RGN_OR);
      DeleteObject (h);
    }
  else
    hRgn = h;

  /* Clean up*/
  g_free (pData);

  return hRgn;
}

HRGN
_gdk_win32_gdkregion_to_hrgn (GdkRegion *region,
			      gint       x_origin,
			      gint       y_origin)
{
  HRGN hrgn;
  RGNDATA *rgndata;
  RECT *rect;
  GdkRegionBox *boxes = region->rects;
  guint nbytes =
    sizeof (RGNDATAHEADER) + (sizeof (RECT) * region->numRects);
  int i;

  rgndata = g_malloc (nbytes);
  rgndata->rdh.dwSize = sizeof (RGNDATAHEADER);
  rgndata->rdh.iType = RDH_RECTANGLES;
  rgndata->rdh.nCount = rgndata->rdh.nRgnSize = 0;
  SetRect (&rgndata->rdh.rcBound,
	   G_MAXLONG, G_MAXLONG, G_MINLONG, G_MINLONG);

  for (i = 0; i < region->numRects; i++)
    {
      rect = ((RECT *) rgndata->Buffer) + rgndata->rdh.nCount++;

      rect->left = boxes[i].x1 + x_origin;
      rect->right = boxes[i].x2 + x_origin;
      rect->top = boxes[i].y1 + y_origin;
      rect->bottom = boxes[i].y2 + y_origin;

      if (rect->left < rgndata->rdh.rcBound.left)
	rgndata->rdh.rcBound.left = rect->left;
      if (rect->right > rgndata->rdh.rcBound.right)
	rgndata->rdh.rcBound.right = rect->right;
      if (rect->top < rgndata->rdh.rcBound.top)
	rgndata->rdh.rcBound.top = rect->top;
      if (rect->bottom > rgndata->rdh.rcBound.bottom)
	rgndata->rdh.rcBound.bottom = rect->bottom;
    }
  if ((hrgn = ExtCreateRegion (NULL, nbytes, rgndata)) == NULL)
    WIN32_API_FAILED ("ExtCreateRegion");

  g_free (rgndata);

  return (hrgn);
}

void
_gdk_windowing_gc_get_foreground (GdkGC    *gc,
				  GdkColor *color)
{
  GdkGCWin32 *win32_gc;
  GdkColormap *cmap;
  
  g_return_if_fail (GDK_IS_GC_WIN32 (gc));

  win32_gc = GDK_GC_WIN32 (gc);

  color->pixel = win32_gc->foreground;
  cmap = gdk_gc_get_colormap (gc);

  if (cmap)
    gdk_colormap_query_color (cmap, win32_gc->foreground, color);
  else
    g_warning ("No colormap in _gdk_windowing_gc_get_foreground");
}