gdkcolor-win32.c

linux下电话本所依赖的一些图形库

static void
create_colormap (GdkColormap *cmap,
		 gboolean     writeable)
{
  struct {
    LOGPALETTE pal;
    PALETTEENTRY pe[256-1];
  } lp;
  HPALETTE hpal;
  GdkColormapPrivateWin32 *cmapp = GDK_WIN32_COLORMAP_DATA (cmap);
  gint i;

  /* Allocate a starting palette with all the static colors. */
  hpal = GetStockObject (DEFAULT_PALETTE);
  lp.pal.palVersion = 0x300;
  lp.pal.palNumEntries = GetPaletteEntries (hpal, 0, 256, lp.pal.palPalEntry);

  if (cmap->visual->type == GDK_VISUAL_STATIC_COLOR &&
      cmap->visual->depth == 4)
    {
      /* Use only 16 colors */
      for (i = 8; i < 16; i++)
	lp.pal.palPalEntry[i] = lp.pal.palPalEntry[i+4];
      lp.pal.palNumEntries = 16;
    }

  for (i = 0; i < lp.pal.palNumEntries; i++)
    lp.pal.palPalEntry[i].peFlags = 0;
  GDK_NOTE (COLORMAP, (g_print ("Default palette %p: %d entries\n",
				hpal, lp.pal.palNumEntries),
		       _gdk_win32_print_paletteentries (lp.pal.palPalEntry,
						       lp.pal.palNumEntries)));
  DeleteObject (hpal);
  
  /* For writeable colormaps, allow all 256 entries to be set. They won't
   * set all 256 system palette entries anyhow, of course, but we shouldn't
   * let the app see that, I think.
   */
  if (writeable)
    cmapp->current_size = 0;
  else
    cmapp->current_size = lp.pal.palNumEntries;

  cmapp->private_val = writeable;

  if (!(cmapp->hpal = CreatePalette (&lp.pal)))
    WIN32_GDI_FAILED ("CreatePalette");
  else
    GDK_NOTE (COLORMAP, g_print ("Created palette %p\n", cmapp->hpal));

  switch (cmap->visual->type)
    {
    case GDK_VISUAL_PSEUDO_COLOR:
      cmapp->use = g_new (GdkWin32PalEntryState, cmap->size);

      /* Mark static colors in use. */
      for (i = 0; i < cmapp->current_size; i++)
	{
	  cmapp->use[i] = GDK_WIN32_PE_STATIC;
	  cmapp->info[i].ref_count = G_MAXUINT/2;
	}
      /* Mark rest not in use */
      for (; i < cmap->size; i++)
	cmapp->use[i] = GDK_WIN32_PE_AVAILABLE;
      break;

    default:
      break;
    }
}

static void
sync_colors (GdkColormap *colormap)
{
  PALETTEENTRY *pe;
  GdkColormapPrivateWin32 *private = GDK_WIN32_COLORMAP_DATA (colormap);
  gint nlookup;
  gint i;
  
  pe = g_new (PALETTEENTRY, colormap->size);
  nlookup = GetPaletteEntries (private->hpal, 0, colormap->size, pe);
	  
  GDK_NOTE (COLORMAP, (g_print ("sync_colors: %p hpal=%p: %d entries\n",
				private, private->hpal, nlookup),
		       _gdk_win32_print_paletteentries (pe, nlookup)));
	  
  for (i = 0; i < nlookup; i++)
    {
      colormap->colors[i].pixel = i;
      colormap->colors[i].red = (pe[i].peRed * 65535) / 255;
      colormap->colors[i].green = (pe[i].peGreen * 65535) / 255;
      colormap->colors[i].blue = (pe[i].peBlue * 65535) / 255;
    }
  
  for ( ; i < colormap->size; i++)
    {
      colormap->colors[i].pixel = i;
      colormap->colors[i].red = 0;
      colormap->colors[i].green = 0;
      colormap->colors[i].blue = 0;
    }
  
  g_free (pe);
}

GdkColormap*
gdk_colormap_new (GdkVisual *visual,
		  gboolean   private_cmap)
{
  GdkColormap *colormap;
  GdkColormapPrivateWin32 *private;

  g_return_val_if_fail (visual != NULL, NULL);

  colormap = g_object_new (gdk_colormap_get_type (), NULL);
  private = GDK_WIN32_COLORMAP_DATA (colormap);

  colormap->visual = visual;

  colormap->size = visual->colormap_size;

  switch (visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      private->info = g_new0 (GdkColorInfo, colormap->size);
      colormap->colors = g_new (GdkColor, colormap->size);
      
      private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					(GEqualFunc) gdk_color_equal);
      
      create_colormap (colormap, private_cmap);

      if (private_cmap)
	{
	  sync_colors (colormap);
#if 0 /* XXX is this needed or not? Seems redundant */
	  gdk_colormap_change (colormap, colormap->size);
#endif
	}
      break;

    case GDK_VISUAL_STATIC_GRAY:
    case GDK_VISUAL_STATIC_COLOR:
      create_colormap (colormap, FALSE);
      colormap->colors = g_new (GdkColor, colormap->size);
      sync_colors (colormap);
      break;

    case GDK_VISUAL_TRUE_COLOR:
      break;

    default:
      g_assert_not_reached ();
    }

  return colormap;
}

GdkColormap*
gdk_screen_get_system_colormap (GdkScreen *screen)
{
  static GdkColormap *colormap = NULL;
  GdkColormapPrivateWin32 *private;

  if (!colormap)
    {
      colormap = g_object_new (gdk_colormap_get_type (), NULL);
      private = GDK_WIN32_COLORMAP_DATA (colormap);

      colormap->visual = gdk_visual_get_system ();

      colormap->size = colormap->visual->colormap_size;

      private->private_val = FALSE;

      switch (colormap->visual->type)
	{
	case GDK_VISUAL_GRAYSCALE:
	case GDK_VISUAL_PSEUDO_COLOR:
	  private->info = g_new0 (GdkColorInfo, colormap->size);
	  private->hash = g_hash_table_new ((GHashFunc) gdk_color_hash,
					    (GEqualFunc) gdk_color_equal);
	  /* Fallthrough */

	case GDK_VISUAL_STATIC_GRAY:
	case GDK_VISUAL_STATIC_COLOR:
	  create_colormap (colormap, FALSE);

	  colormap->colors = g_new (GdkColor, colormap->size);
	  sync_colors (colormap);
	  break;

	case GDK_VISUAL_TRUE_COLOR:
	  break;

	default:
	  g_assert_not_reached ();
	}
    }

  return colormap;
}

gint
gdk_colormap_get_system_size (void)
{
  return gdk_colormap_get_system ()->size;
}

void
gdk_colormap_change (GdkColormap *colormap,
		     gint         ncolors)
{
  GdkColormapPrivateWin32 *cmapp;
  PALETTEENTRY *pe;
  int i;

  g_return_if_fail (colormap != NULL);

  cmapp = GDK_WIN32_COLORMAP_DATA (colormap);

  GDK_NOTE (COLORMAP, g_print ("gdk_colormap_change: hpal=%p ncolors=%d\n",
			       cmapp->hpal, ncolors));

  switch (colormap->visual->type)
    {
    case GDK_VISUAL_GRAYSCALE:
    case GDK_VISUAL_PSEUDO_COLOR:
      pe = g_new (PALETTEENTRY, ncolors);

      for (i = 0; i < ncolors; i++)
	{
	  pe[i].peRed = (colormap->colors[i].red >> 8);
	  pe[i].peGreen = (colormap->colors[i].green >> 8);
	  pe[i].peBlue = (colormap->colors[i].blue >> 8);
	  pe[i].peFlags = 0;
	}

      if (!SetPaletteEntries (cmapp->hpal, 0, ncolors, pe))
	WIN32_GDI_FAILED ("SetPaletteEntries");
      g_free (pe);
      break;

    default:
      break;
    }
}

gboolean
gdk_colors_alloc (GdkColormap   *colormap,
		  gboolean       contiguous,
		  gulong        *planes,
		  gint           nplanes,
		  gulong        *pixels,
		  gint           npixels)
{
  GdkColormapPrivateWin32 *private;
  gint return_val;
  gint i;

  g_return_val_if_fail (GDK_IS_COLORMAP (colormap), 0);

  private = GDK_WIN32_COLORMAP_DATA (colormap);

  return_val = alloc_color_cells (colormap, contiguous,
				  planes, nplanes, pixels, npixels);

  if (return_val)
    {
      for (i = 0; i < npixels; i++)
	{
	  private->info[pixels[i]].ref_count++;
	  private->info[pixels[i]].flags |= GDK_COLOR_WRITEABLE;
	}
    }

  return return_val != 0;
}

void
gdk_colors_free (GdkColormap *colormap,
		 gulong      *in_pixels,
		 gint         in_npixels,
		 gulong       planes)
{
  GdkColormapPrivateWin32 *private;
  gulong *pixels;
  gint npixels = 0;
  gint i;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  g_return_if_fail (in_pixels != NULL);

  private = GDK_WIN32_COLORMAP_DATA (colormap);

  if ((colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (colormap->visual->type != GDK_VISUAL_GRAYSCALE))
    return;
  
  pixels = g_new (gulong, in_npixels);

  for (i = 0; i < in_npixels; i++)
    {
      gulong pixel = in_pixels[i];
      
      if (private->use[pixel] == GDK_WIN32_PE_STATIC)
	continue;

      if (private->info[pixel].ref_count)
	{
	  private->info[pixel].ref_count--;

	  if (private->info[pixel].ref_count == 0)
	    {
	      pixels[npixels++] = pixel;
	      if (!(private->info[pixel].flags & GDK_COLOR_WRITEABLE))
		g_hash_table_remove (private->hash, &colormap->colors[pixel]);
	      private->info[pixel].flags = 0;
	    }
	}
    }

  if (npixels)
    free_colors (colormap, pixels, npixels, planes);

  g_free (pixels);
}

void
gdk_colormap_free_colors (GdkColormap *colormap,
			  GdkColor    *colors,
			  gint         ncolors)
{
  gulong *pixels;
  gint i;

  g_return_if_fail (GDK_IS_COLORMAP (colormap));
  g_return_if_fail (colors != NULL);

  if ((colormap->visual->type != GDK_VISUAL_PSEUDO_COLOR) &&
      (colormap->visual->type != GDK_VISUAL_GRAYSCALE))
    return;

  pixels = g_new (gulong, ncolors);

  for (i = 0; i < ncolors; i++)
    pixels[i] =  colors[i].pixel;

  gdk_colors_free (colormap, pixels, ncolors, 0);

  g_free (pixels);
}

/********************
 * Color allocation *
 ********************/

/* Try to allocate a single color using alloc_color. If it succeeds,
 * cache the result in our colormap, and store in ret.
 */
static gboolean 
gdk_colormap_alloc1 (GdkColormap *colormap,
		     GdkColor    *color,
		     GdkColor    *ret)
{
  GdkColormapPrivateWin32 *private;
  PALETTEENTRY pe;

  private = GDK_WIN32_COLORMAP_DATA (colormap);

  pe.peRed = color->red >> 8;
  pe.peGreen = color->green >> 8;
  pe.peBlue = color->blue >> 8;

  if (alloc_color (colormap, &pe, &ret->pixel))
    {
      ret->red = (pe.peRed * 65535) / 255;
      ret->green = (pe.peGreen * 65535) / 255;
      ret->blue = (pe.peBlue * 65535) / 255;
      
      if ((guint) ret->pixel < colormap->size)
	{
	  if (private->info[ret->pixel].ref_count) /* got a duplicate */
	    {
	    }
	  else
	    {
	      colormap->colors[ret->pixel] = *color;
	      colormap->colors[ret->pixel].pixel = ret->pixel;
	      private->info[ret->pixel].ref_count = 1;

	      g_hash_table_insert (private->hash,
				   &colormap->colors[ret->pixel],
				   &colormap->colors[ret->pixel]);
	    }
	}
      return TRUE;
    }
  return FALSE;
}

static gint
gdk_colormap_alloc_colors_writeable (GdkColormap *colormap,
				     GdkColor    *colors,
				     gint         ncolors,
				     gboolean     writeable,
				     gboolean     best_match,
				     gboolean    *success)
{
  GdkColormapPrivateWin32 *private;
  gulong *pixels;
  gboolean status;
  gint i, index;

  private = GDK_WIN32_COLORMAP_DATA (colormap);

  if (private->private_val)
    {
      index = 0;
      for (i=0; i<ncolors; i++)
	{
	  while ((index < colormap->size) &&
		 (private->info[index].ref_count != 0))
	    index++;
	  
	  if (index < colormap->size)
	    {
	      colors[i].pixel = index;
	      success[i] = TRUE;
	      private->info[index].ref_count++;
	      private->info[i].flags |= GDK_COLOR_WRITEABLE;
	    }
	  else
	    break;
	}
      return i;