gdkrender-fb.c

linux下电话本所依赖的一些图形库

static void
gdk_fb_fill_span_simple_1 (GdkDrawable *drawable,
			   GdkGC       *gc,
			   GdkSpan     *span,
			   GdkColor    *color)
{
  int curx;
  GdkGCFBData *gc_private;
  GdkDrawableFBData *private;
  guchar *mem, *ptr;
  guint rowstride;
  gint left, right, y;

  if (!_gdk_fb_is_active_vt)
    return;

  private = GDK_DRAWABLE_FBDATA (drawable);
  gc_private = GDK_GC_FBDATA (gc);

  g_assert (gc);

  g_assert (!gc_private->values.clip_mask &&
	    !gc_private->values.tile &&
	    !gc_private->values.stipple &&
	    gc_private->values.function != GDK_INVERT);

  y = span->y;
  left = span->x;
  right = span->x + span->width;
  
  mem = private->mem;
  rowstride = private->rowstride;

  {
    int fromx = MIN ((left+7)&(~7), right);
    int begn = fromx - left, begoff = left % 8, endn;
    guchar begmask, endmask;
    int body_end = right & ~7;
    int body_len = (body_end - fromx)/8;
    
    begmask = ((1 << (begn + begoff)) - 1)
      & ~((1 << (begoff)) - 1);
    endn = right - body_end;
    endmask = (1 << endn) - 1;
    
    ptr = mem + y*rowstride + (left >> 3);
	
    if (color->pixel)
      *ptr |= begmask;
    else
      *ptr &= ~begmask;
    
    curx = fromx;
    
    if (curx < right)
      {
	ptr = mem + y*rowstride + (curx >> 3);
	memset (ptr, color->pixel?0xFF:0, body_len);
	
	if (endn)
	  {
	    ptr = mem + y*rowstride + (body_end >> 3);
	    if (color->pixel)
	      *ptr |= endmask;
	    else
	      *ptr &= ~endmask;
	  }
      }
  }
}

static void
gdk_fb_fill_span_simple_8 (GdkDrawable *drawable,
			   GdkGC       *gc,
			   GdkSpan     *span,
			   GdkColor    *color)
{
  GdkGCFBData *gc_private;
  GdkDrawableFBData *private;
  guchar *mem, *ptr;
  guint rowstride;

  if (!_gdk_fb_is_active_vt)
    return;

  private = GDK_DRAWABLE_FBDATA (drawable);
  gc_private = GDK_GC_FBDATA (gc);

  g_assert (gc);

  g_assert (!gc_private->values.clip_mask &&
	    !gc_private->values.tile &&
	    !gc_private->values.stipple &&
	    gc_private->values.function != GDK_INVERT);

  mem = private->mem;
  rowstride = private->rowstride;

  ptr = mem + span->y*rowstride + span->x;
  memset (ptr, color->pixel, span->width);
}

static void
gdk_fb_fill_span_simple_16 (GdkDrawable *drawable,
			    GdkGC       *gc,
			    GdkSpan     *span,
			    GdkColor    *color)
{
  GdkGCFBData *gc_private;
  GdkDrawableFBData *private;
  guchar *mem;
  guint rowstride;
  guint16 *p16;
  int n;
  int i;

  if (!_gdk_fb_is_active_vt)
    return;

  private = GDK_DRAWABLE_FBDATA (drawable);
  gc_private = GDK_GC_FBDATA (gc);

  g_assert (gc);

  g_assert (!gc_private->values.clip_mask &&
	    !gc_private->values.tile &&
	    !gc_private->values.stipple &&
	    gc_private->values.function != GDK_INVERT);

  mem = private->mem;
  rowstride = private->rowstride;

  n = span->width;
  p16 = (guint16 *)(mem + span->y * rowstride + span->x*2);
  for (i = 0; i < n; i++)
    *(p16++) = color->pixel;
}

static void
gdk_fb_fill_span_simple_24 (GdkDrawable *drawable,
			    GdkGC       *gc,
			    GdkSpan     *span,
			    GdkColor    *color)
{
  GdkGCFBData *gc_private;
  GdkDrawableFBData *private;
  guchar *mem, *ptr;
  guint rowstride;
  int n;
  guchar redval, greenval, blueval;
  guchar *firstline, *ptr_end;

  if (!_gdk_fb_is_active_vt)
    return;

  private = GDK_DRAWABLE_FBDATA (drawable);
  gc_private = GDK_GC_FBDATA (gc);

  g_assert (gc);

  g_assert (!gc_private->values.clip_mask &&
	    !gc_private->values.tile &&
	    !gc_private->values.stipple &&
	    gc_private->values.function != GDK_INVERT);

  mem = private->mem;
  rowstride = private->rowstride;

  redval = color->red>>8;
  greenval = color->green>>8;
  blueval = color->blue>>8;
    
  n = span->width*3;
    
  firstline = ptr = mem + span->y * rowstride + span->x*3;
  ptr_end = ptr+n;
  while (ptr < ptr_end)
    {
      ptr[gdk_display->red_byte] = redval;
      ptr[gdk_display->green_byte] = greenval;
      ptr[gdk_display->blue_byte] = blueval;
      ptr += 3;
    }
}

static void
gdk_fb_fill_span_simple_32 (GdkDrawable *drawable,
			    GdkGC       *gc,
			    GdkSpan     *span,
			    GdkColor    *color)
{
  GdkGCFBData *gc_private;
  GdkDrawableFBData *private;
  guchar *mem;
  guint rowstride;
  guint32 *p32;
  int n;
  int i;

  if (!_gdk_fb_is_active_vt)
    return;

  private = GDK_DRAWABLE_FBDATA (drawable);
  gc_private = GDK_GC_FBDATA (gc);

  g_assert (gc);

  g_assert (!gc_private->values.clip_mask &&
	    !gc_private->values.tile &&
	    !gc_private->values.stipple &&
	    gc_private->values.function != GDK_INVERT);

  mem = private->mem;
  rowstride = private->rowstride;

  n = span->width;
  p32 = (guint32 *)(mem + span->y * rowstride + span->x*4);
  for (i = 0; i < n; i++)
    *(p32++) = color->pixel;
}


/*************************************
 * gc->draw_drawable() implementations
 *************************************/

static void
gdk_fb_draw_drawable_generic (GdkDrawable *drawable,
			      GdkGC       *gc,
			      GdkPixmap   *src,
			      GdkFBDrawingContext *dc,
			      gint         start_y,
			      gint         end_y,
			      gint         start_x,
			      gint         end_x,
			      gint         src_x_off,
			      gint         src_y_off,
			      gint         draw_direction)
{
  GdkDrawableFBData *private = GDK_DRAWABLE_FBDATA (drawable);
  int cur_x, cur_y;

  if (draw_direction < 0)
    {
      int tmp;
      tmp = start_y;
      start_y = end_y;
      end_y = tmp;
      start_y--;
      end_y--;
      
      tmp = start_x;
      start_x = end_x;
      end_x = tmp;
      start_x--;
      end_x--;
    }

  for (cur_y = start_y; cur_y != end_y; cur_y+=draw_direction)
    {
      for (cur_x = start_x; cur_x != end_x; cur_x+=draw_direction)
	{
	  GdkColor spot;
	  
	  if (GDK_GC_FBDATA(gc)->values.clip_mask)
	    {
	      int maskx = cur_x + dc->clipxoff, masky = cur_y + dc->clipyoff;
	      guchar foo;
	      
	      foo = dc->clipmem[masky*dc->clip_rowstride + (maskx >> 3)];
	      
	      if (!(foo & (1 << (maskx % 8))))
		continue;
	    }
	  
	  switch (gdk_fb_drawable_get_color (src, gc, cur_x + src_x_off, cur_y + src_y_off, &spot))
	    {
	    case GPR_AA_GRAYVAL:
	      {
		GdkColor realspot, fg;
		guint graylevel = spot.pixel;
		gint tmp;
		
		if (private->depth == 1)
		  {
		    if (spot.pixel > 192)
		      spot = GDK_GC_FBDATA (gc)->values.foreground;
		    else
		      spot = GDK_GC_FBDATA (gc)->values.background;
		    break;
		  }
		else
		  {
		    if (graylevel >= 254)
		      {
			spot = GDK_GC_FBDATA (gc)->values.foreground;
		      }
		    else if (graylevel <= 2)
		      {
			if (!dc->draw_bg)
			  continue;
			
			spot = GDK_GC_FBDATA (gc)->values.background;
		      }
		    else
		      {
			switch ((GDK_GC_FBDATA (gc)->get_color) (drawable, gc, cur_x, cur_y, &realspot))
			  {
			  case GPR_USED_BG:
			    {
			      int bgx, bgy;
			      
			      bgx = (cur_x - GDK_DRAWABLE_IMPL_FBDATA (dc->bg_relto)->abs_x) % GDK_DRAWABLE_IMPL_FBDATA (dc->bgpm)->width + private->abs_x;
			      bgy = (cur_y - GDK_DRAWABLE_IMPL_FBDATA (dc->bg_relto)->abs_y) % GDK_DRAWABLE_IMPL_FBDATA (dc->bgpm)->height + private->abs_y;
			      gdk_fb_drawable_get_color (dc->bgpm, gc, bgx, bgy, &realspot);
			    }
			    break;
			  case GPR_NONE:
			    break;
			  default:
			    g_assert_not_reached ();
			    break;
			  }
			
			fg = GDK_GC_FBDATA (gc)->values.foreground;

			/* Now figure out what 'spot' should actually look like */
			fg.red >>= 8;
			fg.green >>= 8;
			fg.blue >>= 8;
			realspot.red >>= 8;
			realspot.green >>= 8;
			realspot.blue >>= 8;

				
			tmp = (fg.red - realspot.red) * graylevel;
			spot.red = realspot.red + ((tmp + (tmp >> 8) + 0x80) >> 8);
			spot.red <<= 8;
			
			tmp = (fg.green - realspot.green) * graylevel;
			spot.green = realspot.green + ((tmp + (tmp >> 8) + 0x80) >> 8);
			spot.green <<= 8;
			
			tmp = (fg.blue - realspot.blue) * graylevel;
			spot.blue = realspot.blue + ((tmp + (tmp >> 8) + 0x80) >> 8);
			spot.blue <<= 8;
			
			/* Now find the pixel for this thingie */
			switch (private->depth)
			  {
			  case 8:
			    if (!gdk_colormap_alloc_color (private->colormap, &spot, FALSE, TRUE))
			      {
				g_error ("Can't allocate AA color!");
			      }
			    break;
			  case 16:
			    spot.pixel = (spot.red >> (16 - gdk_display->modeinfo.red.length)) << gdk_display->modeinfo.red.offset;
			    spot.pixel |= (spot.green >> (16 - gdk_display->modeinfo.green.length)) << gdk_display->modeinfo.green.offset;
			    spot.pixel |= (spot.blue >> (16 - gdk_display->modeinfo.blue.length)) << gdk_display->modeinfo.blue.offset;
			    break;
			  case 24:
			  case 32:
			    spot.pixel = ((spot.red & 0xFF00) >> 8  << (gdk_display->modeinfo.red.offset))
			      | ((spot.green & 0xFF00) >> 8 << (gdk_display->modeinfo.green.offset))
			      | ((spot.blue & 0xFF00) >> 8 << (gdk_display->modeinfo.blue.offset));
			    break;
			  }
		      }
		  }
	      }
	      break;
	    case GPR_USED_BG:
	      if (!dc->draw_bg)
		continue;
	      break;
	    case GPR_NONE:
	      break;
	    default:
	      g_assert_not_reached ();
	      break;
	    }
	  
	  (GDK_GC_FBDATA (gc)->set_pixel) (drawable, gc, cur_x, cur_y, spot.pixel);
	}
    }

}

void
gdk_fb_draw_drawable_memmove (GdkDrawable *drawable,
			      GdkGC       *gc,
			      GdkPixmap   *src,
			      GdkFBDrawingContext *dc,
			      gint         start_y,
			      gint         end_y,
			      gint         start_x,
			      gint         end_x,
			      gint         src_x_off,
			      gint         src_y_off,
			      gint         draw_direction)
{
  GdkDrawableFBData *src_private = GDK_DRAWABLE_FBDATA (src);
  guint depth = src_private->depth;
  guint src_rowstride = src_private->rowstride;
  guchar *srcmem = src_private->mem;
  int linelen = (end_x - start_x)*(depth>>3);
  gint cur_y;

  if (!_gdk_fb_is_active_vt)
    return;

  if (draw_direction < 0)
    {
      int tmp;
      tmp = start_y;
      start_y = end_y;
      end_y = tmp;
      start_y--;
      end_y--;
    }

  for(cur_y = start_y; cur_y != end_y; cur_y += draw_direction)
    {
      memmove (dc->mem + (cur_y * dc->rowstride) + start_x*(depth>>3),
	       srcmem + ((cur_y + src_y_off)*src_rowstride) + (start_x + src_x_off)*(depth>>3),
	       linelen);
    }

}

static void
gdk_fb_draw_drawable_aa_24 (GdkDrawable *drawable,
			    GdkGC       *gc,
			    GdkPixmap   *src,
			    GdkFBDrawingContext *dc,
			    gint         start_y,
			    gint         end_y,
			    gint         start_x,
			    gint         end_x,
			    gint         src_x_off,
			    gint         src_y_off,
			    gint         draw_direction)
{
  GdkDrawableFBData *private = GDK_DRAWABLE_FBDATA (drawable);
  int x, y;
  GdkGCFBData *gc_private;
  guchar *dmem = private->mem;
  guint dst_rowstride = private->rowstride;
  guchar *smem = GDK_DRAWABLE_FBDATA (src)->mem;
  guint src_rowstride = GDK_DRAWABLE_FBDATA (src)->rowstride;
  guchar *dst;
  guint grayval;
  gint r, g, b, tmp;
  GdkColor fg;
  gint fg_r, fg_g, fg_b;
  
  if (!_gdk_fb_is_active_vt)
    return;

  gc_private = GDK_GC_FBDATA (gc);

  fg = GDK_GC_FBDATA (gc)->values.foreground;
  fg_r = fg.red >> 8;
  fg_g = fg.green >> 8;
  fg_b = fg.blue >> 8;

  if (draw_direction < 0)
    {
      int tmp;
      tmp = start_y;
      start_y = end_y;
      end_y = tmp;
      start_y--;
      end_y--;
      
      tmp = start_x;
      start_x = end_x;
      end_x = tmp;
      start_x--;
      end_x--;
    }

  for (y = start_y; y != end_y; y+=draw_direction)
    {
      for (x = start_x; x != end_x; x+=draw_direction)
	{
	  grayval = smem[x + src_x_off + (y + src_y_off) * src_rowstride];

	  if ((grayval <= 2) && (!dc->draw_bg))
	    continue;

	  dst = &dmem[x*3 + y*dst_rowstride];
	  
	  if (grayval >= 254)
	    {
	      dst[gdk_display->red_byte] = fg_r;
	      dst[gdk_display->green_byte] = fg_g;
	      dst[gdk_display->blue_byte] = fg_b;
	    }
	  else if (grayval <= 2)
	    {
	      dst[gdk_display->red_byte] = GDK_GC_FBDATA (gc)->values.background.red >> 8;
	      dst[gdk_display->green_byte] = GDK_GC_FBDATA (gc)->values.background.green >> 8;
	      dst[gdk_display->blue_byte] = GDK_GC_FBDATA (gc)->values.background.blue >> 8;
	    }
	  else
	    {