gtk/gdk/win32/gdkimage.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"

#include <gdk/gdk.h>
#include "gdkprivate.h"

static void gdk_image_put_normal (GdkDrawable *drawable,
				  GdkGC       *gc,
				  GdkImage    *image,
				  gint         xsrc,
				  gint         ysrc,
				  gint         xdest,
				  gint         ydest,
				  gint         width,
				  gint         height);
static GList *image_list = NULL;

void
gdk_image_exit (void)
{
  GdkImage *image;

  while (image_list)
    {
      image = image_list->data;
      gdk_image_destroy (image);
    }
}

GdkImage *
gdk_image_new_bitmap (GdkVisual *visual, gpointer data, gint w, gint h)
/*
 * Desc: create a new bitmap image
 */
{
  Visual *xvisual;
  GdkImage *image;
  GdkImagePrivate *private;
  struct {
    BITMAPINFOHEADER bmiHeader;
    union {
      WORD bmiIndices[2];
      RGBQUAD bmiColors[2];
    } u;
  } bmi;
  char *bits;
  int bpl = (w-1)/8 + 1;
  int bpl32 = ((w-1)/32 + 1)*4;

  private = g_new(GdkImagePrivate, 1);
  image = (GdkImage *) private;
  private->image_put = gdk_image_put_normal;
  image->type = GDK_IMAGE_NORMAL;
  image->visual = visual;
  image->width = w;
  image->height = h;
  image->depth = 1;
  xvisual = ((GdkVisualPrivate*) visual)->xvisual;

  GDK_NOTE (MISC, g_print ("gdk_image_new_bitmap: %dx%d\n", w, h));
  
  bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
  bmi.bmiHeader.biWidth = w;
  bmi.bmiHeader.biHeight = -h;
  bmi.bmiHeader.biPlanes = 1;
  bmi.bmiHeader.biBitCount = 1;
  bmi.bmiHeader.biCompression = BI_RGB;
  bmi.bmiHeader.biSizeImage = 0;
  bmi.bmiHeader.biXPelsPerMeter =
    bmi.bmiHeader.biYPelsPerMeter = 0;
  bmi.bmiHeader.biClrUsed = 0;
  bmi.bmiHeader.biClrImportant = 0;
  
  bmi.u.bmiColors[0].rgbBlue = 
    bmi.u.bmiColors[0].rgbGreen = 
    bmi.u.bmiColors[0].rgbRed = 0x00;
  bmi.u.bmiColors[0].rgbReserved = 0x00;

  bmi.u.bmiColors[1].rgbBlue = 
    bmi.u.bmiColors[1].rgbGreen = 
    bmi.u.bmiColors[1].rgbRed = 0xFF;
  bmi.u.bmiColors[1].rgbReserved = 0x00;
  
  private->ximage = CreateDIBSection (gdk_DC, (BITMAPINFO *) &bmi,
				      DIB_RGB_COLORS, &bits, NULL, 0);
  if (bpl != bpl32)
    {
      /* Win32 expects scanlines in DIBs to be 32 bit aligned */
      int i;
      for (i = 0; i < h; i++)
	memmove (bits + i*bpl32, ((char *) data) + i*bpl, bpl);
    }
  else
    memmove (bits, data, bpl*h);
  image->mem = bits;
  image->bpl = bpl32;
  image->byte_order = GDK_MSB_FIRST;

  image->bpp = 1;
  return(image);
} /* gdk_image_new_bitmap() */

void
gdk_image_init (void)
{
}

static GdkImage*
gdk_image_new_with_depth (GdkImageType  type,
			  GdkVisual    *visual,
			  gint          width,
			  gint          height,
			  gint		depth)
{
  GdkImage *image;
  GdkImagePrivate *private;
  Visual *xvisual;
  struct {
    BITMAPINFOHEADER bmiHeader;
    union {
      WORD bmiIndices[256];
      DWORD bmiMasks[3];
      RGBQUAD bmiColors[256];
    } u;
  } bmi;
  UINT iUsage;
  int i;

  GDK_NOTE (MISC, g_print ("gdk_image_new_with_depth: %dx%dx%d\n",
			   width, height, depth));

  switch (type)
    {
    case GDK_IMAGE_FASTEST:
      image = gdk_image_new_with_depth (GDK_IMAGE_SHARED, visual,
					width, height, depth);

      if (!image)
	image = gdk_image_new_with_depth (GDK_IMAGE_NORMAL, visual,
					  width, height, depth);
      break;

    default:
      private = g_new (GdkImagePrivate, 1);
      image = (GdkImage*) private;

      private->image_put = NULL;

      image->type = type;
      image->visual = visual;
      image->width = width;
      image->height = height;
      image->depth = depth;

      xvisual = ((GdkVisualPrivate*) visual)->xvisual;

      switch (type)
	{
	case GDK_IMAGE_SHARED:
	case GDK_IMAGE_SHARED_PIXMAP:
	  /* Fall through, Windows images are always shared */
	case GDK_IMAGE_NORMAL:
	  private->image_put = gdk_image_put_normal;

	  bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
	  bmi.bmiHeader.biWidth = width;
	  bmi.bmiHeader.biHeight = -height;
	  bmi.bmiHeader.biPlanes = 1;
	  if (depth == 15)
	    bmi.bmiHeader.biBitCount = 16;
	  else
	    bmi.bmiHeader.biBitCount = depth;
#if 1
	  if (depth == 16)
	    bmi.bmiHeader.biCompression = BI_BITFIELDS;
	  else
#endif
	    bmi.bmiHeader.biCompression = BI_RGB;
	  bmi.bmiHeader.biSizeImage = 0;
	  bmi.bmiHeader.biXPelsPerMeter =
	    bmi.bmiHeader.biYPelsPerMeter = 0;
	  bmi.bmiHeader.biClrUsed = 0;
	  bmi.bmiHeader.biClrImportant = 0;
	  
	  if (image->visual->type == GDK_VISUAL_PSEUDO_COLOR)
	    {
	      iUsage = DIB_PAL_COLORS;
	      for (i = 0; i < 256; i++)
		bmi.u.bmiIndices[i] = i;
	    }
	  else
	    {
	      if (depth == 1)
		{
		  bmi.u.bmiColors[0].rgbBlue = 
		    bmi.u.bmiColors[0].rgbGreen =
		    bmi.u.bmiColors[0].rgbRed = 0x00;
		  bmi.u.bmiColors[0].rgbReserved = 0x00;
		  
		  bmi.u.bmiColors[1].rgbBlue = 
		    bmi.u.bmiColors[1].rgbGreen =
		    bmi.u.bmiColors[1].rgbRed = 0xFF;
		  bmi.u.bmiColors[1].rgbReserved = 0x00;
		  
		}
#if 1
	      else if (depth == 16)
		{
		  bmi.u.bmiMasks[0] = visual->red_mask;
		  bmi.u.bmiMasks[1] = visual->green_mask;
		  bmi.u.bmiMasks[2] = visual->blue_mask;
		}
#endif
	      iUsage = DIB_RGB_COLORS;
	    }
	  
	  private->ximage =
	    CreateDIBSection (gdk_DC, (BITMAPINFO *) &bmi, iUsage,
			      &image->mem, NULL, 0);
	  
	  if (private->ximage == NULL)
	    {
	      g_warning ("gdk_image_new_with_depth: CreateDIBSection failed");
	      g_free (image);
	      return NULL;
	    }
	  
	  switch (depth)
	    {
	    case 1:
	    case 8:
	      image->bpp = 1;
	      break;
	    case 15:
	    case 16:
	      image->bpp = 2;
	      break;
	    case 24:
	      image->bpp = 3;
	      break;
	    case 32:
	      image->bpp = 4;
	      break;
	    default:
	      g_warning ("gdk_image_new_with_depth: depth = %d", depth);
	      g_assert_not_reached ();
	    }
	  image->byte_order = GDK_LSB_FIRST;
	  if (depth == 1)
	    image->bpl = ((width-1)/32 + 1)*4;
	  else
	    image->bpl = ((width*image->bpp - 1)/4 + 1)*4;

	  GDK_NOTE (MISC, g_print ("... = %#x mem = %#x, bpl = %d\n",
				   private->ximage, image->mem, image->bpl));

	  break;

	case GDK_IMAGE_FASTEST:
	  g_assert_not_reached ();
	}
      
      break;
    }

  return image;
}

GdkImage*
gdk_image_new (GdkImageType  type,
	       GdkVisual    *visual,
	       gint          width,
	       gint          height)
{
  return gdk_image_new_with_depth (type, visual, width, height, visual->depth);
}

GdkImage*
gdk_image_bitmap_new (GdkImageType  type,
		      GdkVisual    *visual,
		      gint          width,
		      gint          height)
{
  return gdk_image_new_with_depth (type, visual, width, height, 1);
}

GdkImage*
gdk_image_get (GdkWindow *window,
	       gint       x,
	       gint       y,
	       gint       width,
	       gint       height)
{
  GdkImage *image;
  GdkImagePrivate *private;
  GdkWindowPrivate *win_private;
  HDC hdc, memdc;
  struct {
    BITMAPINFOHEADER bmiHeader;
    union {
      WORD bmiIndices[256];
      DWORD bmiMasks[3];
      RGBQUAD bmiColors[256];
    } u;
  } bmi;
  HGDIOBJ oldbitmap1, oldbitmap2;
  UINT iUsage;
  BITMAP bm;
  int i;

  g_return_val_if_fail (window != NULL, NULL);

  win_private = (GdkWindowPrivate *) window;
  if (win_private->destroyed)
    return NULL;

  GDK_NOTE (MISC, g_print ("gdk_image_get: %#x %dx%d@+%d+%d\n",
			   win_private->xwindow, width, height, x, y));

  private = g_new (GdkImagePrivate, 1);
  image = (GdkImage*) private;

  private->image_put = gdk_image_put_normal;

  image->type = GDK_IMAGE_NORMAL;
  image->visual = gdk_window_get_visual (window);
  image->width = width;
  image->height = height;

  /* This function is called both to blit from a window and from
   * a pixmap.
   */
  if (win_private->window_type == GDK_WINDOW_PIXMAP)
    {
      if ((hdc = CreateCompatibleDC (NULL)) == NULL)
	{
	  g_warning ("gdk_image_get: CreateCompatibleDC #1 failed");
	  g_free (image);
	  return NULL;
	}
      if ((oldbitmap1 = SelectObject (hdc, win_private->xwindow)) == NULL)
	{
	  g_warning ("gdk_image_get: SelectObject #1 failed");
	  DeleteDC (hdc);
	  g_free (image);
	  return NULL;
	}
      GetObject (win_private->xwindow, sizeof (BITMAP), &bm);
      GDK_NOTE (MISC,
		g_print ("gdk_image_get: bmWidth = %d, bmHeight = %d, bmWidthBytes = %d, bmBitsPixel = %d\n",
			 bm.bmWidth, bm.bmHeight, bm.bmWidthBytes, bm.bmBitsPixel));
      image->depth = bm.bmBitsPixel;
      if (image->depth <= 8)
	{
	  iUsage = DIB_PAL_COLORS;
	  for (i = 0; i < 256; i++)
	    bmi.u.bmiIndices[i] = i;
	}
      else
	iUsage = DIB_RGB_COLORS;
    }
  else
    {
      if ((hdc = GetDC (win_private->xwindow)) == NULL)
	{
	  g_warning ("gdk_image_get: GetDC failed");
	  g_free (image);
	  return NULL;
	}
      image->depth = gdk_visual_get_system ()->depth;
      if (image->visual->type == GDK_VISUAL_PSEUDO_COLOR)
	{
	  iUsage = DIB_PAL_COLORS;
	  for (i = 0; i < 256; i++)
	    bmi.u.bmiIndices[i] = i;
	}
      else
	iUsage = DIB_RGB_COLORS;
    }

  if ((memdc = CreateCompatibleDC (hdc)) == NULL)
    {
      g_warning ("gdk_image_get: CreateCompatibleDC #2 failed");
      if (win_private->window_type == GDK_WINDOW_PIXMAP)
	{
	  SelectObject (hdc, oldbitmap1);
	  DeleteDC (hdc);
	}
      else
	{
	  ReleaseDC (win_private->xwindow, hdc);
	}
      g_free (image);
      return NULL;
    }

  bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
  bmi.bmiHeader.biWidth = width;
  bmi.bmiHeader.biHeight = -height;
  bmi.bmiHeader.biPlanes = 1;
  bmi.bmiHeader.biBitCount = image->depth;
  if (image->depth == 16)
    {
      bmi.bmiHeader.biCompression = BI_BITFIELDS;
      if (image->visual == NULL)
	{
	  /* XXX ??? Is it always this if depth==16 and a pixmap? Guess so. */
	  bmi.u.bmiMasks[0] = 0xf800;
	  bmi.u.bmiMasks[1] = 0x07e0;
	  bmi.u.bmiMasks[2] = 0x001f;
	}
      else
	{
	  bmi.u.bmiMasks[0] = image->visual->red_mask;
	  bmi.u.bmiMasks[1] = image->visual->green_mask;
	  bmi.u.bmiMasks[2] = image->visual->blue_mask;
	}
    }
  else
    bmi.bmiHeader.biCompression = BI_RGB;
  bmi.bmiHeader.biSizeImage = 0;
  bmi.bmiHeader.biXPelsPerMeter =
    bmi.bmiHeader.biYPelsPerMeter = 0;
  bmi.bmiHeader.biClrUsed = 0;
  bmi.bmiHeader.biClrImportant = 0;

  if ((private->ximage =
       CreateDIBSection (hdc, (BITMAPINFO *) &bmi, iUsage,
			 &image->mem, NULL, 0)) == NULL)
    {
      g_warning ("gdk_image_get: CreateDIBSection failed");
      DeleteDC (memdc);
      if (win_private->window_type == GDK_WINDOW_PIXMAP)
	{
	  SelectObject (hdc, oldbitmap1);
	  DeleteDC (hdc);
	}
      else
	{
	  ReleaseDC (win_private->xwindow, hdc);
	}
      g_free (image);
      return NULL;
    }

  if ((oldbitmap2 = SelectObject (memdc, private->ximage)) == NULL)
    {
      g_warning ("gdk_image_get: SelectObject #2 failed");
      DeleteObject (private->ximage);
      DeleteDC (memdc);
      if (win_private->window_type == GDK_WINDOW_PIXMAP)
	{
	  SelectObject (hdc, oldbitmap1);
	  DeleteDC (hdc);
	}
      else
	{
	  ReleaseDC (win_private->xwindow, hdc);
	}
      g_free (image);
      return NULL;
    }

  if (!BitBlt (memdc, 0, 0, width, height, hdc, x, y, SRCCOPY))
    {
      g_warning ("gdk_image_get: BitBlt failed");
      SelectObject (memdc, oldbitmap2);
      DeleteObject (private->ximage);
      DeleteDC (memdc);
      if (win_private->window_type == GDK_WINDOW_PIXMAP)
	{
	  SelectObject (hdc, oldbitmap1);
	  DeleteDC (hdc);
	}
      else
	{
	  ReleaseDC (win_private->xwindow, hdc);
	}
      g_free (image);
      return NULL;
    }

  if (SelectObject (memdc, oldbitmap2) == NULL)
    g_warning ("gdk_image_get: SelectObject #3 failed");

  if (!DeleteDC (memdc))
    g_warning ("gdk_image_get: DeleteDC failed");

  if (win_private->window_type == GDK_WINDOW_PIXMAP)
    {
      SelectObject (hdc, oldbitmap1);
      DeleteDC (hdc);
    }
  else
    {
      ReleaseDC (win_private->xwindow, hdc);
    }

  switch (image->depth)
    {
    case 1:
    case 8:
      image->bpp = 1;
      break;
    case 15:
    case 16:
      image->bpp = 2;
      break;
    case 24:
      image->bpp = 3;
      break;
    case 32:
      image->bpp = 4;
      break;
    default:
      g_warning ("gdk_image_get: image->depth = %d", image->depth);
      g_assert_not_reached ();
    }
  image->byte_order = GDK_LSB_FIRST;
  if (image->depth == 1)
    image->bpl = (width - 1)/8 + 1;
  else
    image->bpl = ((width*image->bpp - 1)/4 + 1)*4;

  GDK_NOTE (MISC, g_print ("... = %#x mem = %#x, bpl = %d\n",
			   private->ximage, image->mem, image->bpl));

  return image;
}

guint32
gdk_image_get_pixel (GdkImage *image,
		     gint x,
		     gint y)
{
  guint32 pixel;
  GdkImagePrivate *private;

  g_return_val_if_fail (image != NULL, 0);

  private = (GdkImagePrivate *) image;

  g_return_val_if_fail (x >= 0 && x < image->width
			&& y >= 0 && y < image->height, 0);

  if (image->depth == 1)
    pixel = (((char *) image->mem)[y * image->bpl + (x >> 3)] & (1 << (7 - (x & 0x7)))) != 0;
  else
    {
      guchar *pixelp = (guchar *) image->mem + y * image->bpl + x * image->bpp;
      
      switch (image->bpp)
	{
	case 1:
	  pixel = *pixelp;
	  break;

	/* Windows is always LSB, no need to check image->byte_order. */
	case 2:
	  pixel = pixelp[0] | (pixelp[1] << 8);
	  break;

	case 3:
	  pixel = pixelp[0] | (pixelp[1] << 8) | (pixelp[2] << 16);
	  break;

	case 4:
	  pixel = pixelp[0] | (pixelp[1] << 8) | (pixelp[2] << 16);
	  break;
	}
    }

  return pixel;
}

void
gdk_image_put_pixel (GdkImage *image,
		     gint x,
		     gint y,
		     guint32 pixel)
{
  GdkImagePrivate *private;

  g_return_if_fail (image != NULL);

  private = (GdkImagePrivate *) image;

  g_return_if_fail (x >= 0 && x < image->width && y >= 0 && y < image->height);

  if (image->depth == 1)
    if (pixel & 1)
      ((guchar *) image->mem)[y * image->bpl + (x >> 3)] |= (1 << (7 - (x & 0x7)));
    else
      ((guchar *) image->mem)[y * image->bpl + (x >> 3)] &= ~(1 << (7 - (x & 0x7)));
  else
    {
      guchar *pixelp = (guchar *) image->mem + y * image->bpl + x * image->bpp;
      
      /* Windows is always LSB, no need to check image->byte_order. */
      switch (image->bpp)
	{
	case 4:
	  pixelp[3] = 0;
	case 3:
	  pixelp[2] = ((pixel >> 16) & 0xFF);
	case 2:
	  pixelp[1] = ((pixel >> 8) & 0xFF);
	case 1:
	  pixelp[0] = (pixel & 0xFF);
	}
    }
}

void
gdk_image_destroy (GdkImage *image)
{
  GdkImagePrivate *private;

  g_return_if_fail (image != NULL);

  private = (GdkImagePrivate*) image;

  GDK_NOTE (MISC, g_print ("gdk_image_destroy: %#x%s\n",
			   private->ximage,
			   (image->type == GDK_IMAGE_SHARED_PIXMAP ?
			    " (shared pixmap)" : "")));
  
  switch (image->type)
    {
    case GDK_IMAGE_NORMAL:
    case GDK_IMAGE_SHARED_PIXMAP:
      break;			/* The Windows bitmap has already been
				 * (or will be) deleted when freeing
				 * the corresponding pixmap.
				 */

    case GDK_IMAGE_SHARED:	/* All images are shared in Windows */
      DeleteObject (private->ximage);
      break;

    case GDK_IMAGE_FASTEST:
      g_assert_not_reached ();
    }

  g_free (image);
}

static void
gdk_image_put_normal (GdkDrawable *drawable,
		      GdkGC       *gc,
		      GdkImage    *image,
		      gint         xsrc,
		      gint         ysrc,
		      gint         xdest,
		      gint         ydest,
		      gint         width,
		      gint         height)
{
  GdkWindowPrivate *drawable_private;
  GdkImagePrivate *image_private;
  GdkGCPrivate *gc_private;
  HDC hdc;
  GdkColormapPrivate *colormap_private;

  g_return_if_fail (drawable != NULL);
  g_return_if_fail (image != NULL);
  g_return_if_fail (gc != NULL);

  drawable_private = (GdkWindowPrivate*) drawable;
  if (drawable_private->destroyed)
    return;
  image_private = (GdkImagePrivate*) image;
  gc_private = (GdkGCPrivate*) gc;

  /* The image can in fact be "shared", so don't test */

  hdc = gdk_gc_predraw (drawable_private, gc_private);
  colormap_private = (GdkColormapPrivate *) drawable_private->colormap;
  if (colormap_private && colormap_private->xcolormap->rc_palette)
    {
      DIBSECTION ds;
      static struct {
	BITMAPINFOHEADER bmiHeader;
	WORD bmiIndices[256];
      } bmi;
      static gboolean bmi_inited = FALSE;
      int i;

      if (!bmi_inited)
	{
	  for (i = 0; i < 256; i++)
	    bmi.bmiIndices[i] = i;
	  bmi_inited = TRUE;
	}

      if (GetObject (image_private->ximage, sizeof (DIBSECTION),
		     &ds) != sizeof (DIBSECTION))
	{
	  g_warning ("gdk_image_put_normal: GetObject failed");
	}
#if 0
      g_print("xdest = %d, ydest = %d, xsrc = %d, ysrc = %d, width = %d, height = %d\n",
	      xdest, ydest, xsrc, ysrc, width, height);
      g_print("bmWidth = %d, bmHeight = %d, bmBitsPixel = %d, bmBits = %p\n",
	      ds.dsBm.bmWidth, ds.dsBm.bmHeight, ds.dsBm.bmBitsPixel, ds.dsBm.bmBits);
      g_print("biWidth = %d, biHeight = %d, biBitCount = %d, biClrUsed = %d\n",
	      ds.dsBmih.biWidth, ds.dsBmih.biHeight, ds.dsBmih.biBitCount, ds.dsBmih.biClrUsed);
#endif
      bmi.bmiHeader = ds.dsBmih;
      /* I have spent hours on getting the parameters to
       * SetDIBitsToDevice right. I wonder what drugs the guys in
       * Redmond were on when they designed this API.
       */
      if (SetDIBitsToDevice (hdc,
			     xdest, ydest,
			     width, height,
			     xsrc, (-ds.dsBmih.biHeight)-height-ysrc,
			     0, -ds.dsBmih.biHeight,
			     ds.dsBm.bmBits,
			     (CONST BITMAPINFO *) &bmi,
			     DIB_PAL_COLORS) == 0)
	g_warning ("SetDIBitsToDevice failed");
    }
  else
    {
      HDC memdc;
      HGDIOBJ oldbitmap;

      if ((memdc = CreateCompatibleDC (hdc)) == NULL)
	{
	  g_warning ("gdk_image_put_normal: CreateCompatibleDC failed");
	  gdk_gc_postdraw (drawable_private, gc_private);
	  return;
	}

      if ((oldbitmap = SelectObject (memdc, image_private->ximage)) == NULL)
	{
	  g_warning ("gdk_image_put_normal: SelectObject #1 failed");
	  gdk_gc_postdraw (drawable_private, gc_private);
	  return;
	}
      if (!BitBlt (hdc, xdest, ydest, width, height,
		   memdc, xsrc, ysrc, SRCCOPY))
	g_warning ("gdk_image_put_normal: BitBlt failed");

      if (SelectObject (memdc, oldbitmap) == NULL)
	g_warning ("gdk_image_put_normal: SelectObject #2 failed");

      if (!DeleteDC (memdc))
	g_warning ("gdk_image_put_normal: DeleteDC failed");
    }
  gdk_gc_postdraw (drawable_private, gc_private);
}