**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
-** Copyright (c) 2007 Chris Moore
+** Copyright (c) 2007, 2008 Chris Moore
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
origin(0,0),
depth(0),
zoom(0),
- time_offset(0)
+ time_offset(0),
+ extra_reference(false)
{
children_lock=false;
muck_with_time_=true;
set_sub_canvas(0);
//if(canvas && (canvas->is_inline() || !get_canvas() || get_canvas()->get_root()!=canvas->get_root()))
+ //if(extra_reference)
// canvas->unref();
}
if(canvas && muck_with_time_)
remove_child(canvas.get());
- if(canvas && (canvas->is_inline() || !get_canvas() || get_canvas()->get_root()!=canvas->get_root()))
+ // if(canvas && (canvas->is_inline() || !get_canvas() || get_canvas()->get_root()!=canvas->get_root()))
+ if (extra_reference)
canvas->unref();
child_changed_connection.disconnect();
);
*/
if(canvas)
- bounds=(canvas->get_context().get_full_bounding_rect()-canvas->rend_desc().get_focus())*exp(zoom)+origin+canvas->rend_desc().get_focus();
+ bounds = ((canvas->get_context().get_full_bounding_rect() - canvas->rend_desc().get_focus()) * exp(zoom) +
+ origin + canvas->rend_desc().get_focus());
if(canvas && muck_with_time_)
add_child(canvas.get());
if(canvas && (canvas->is_inline() || !get_canvas() || get_canvas()->get_root()!=canvas->get_root()))
+ {
canvas->ref();
+ extra_reference = true;
+ }
+ else
+ extra_reference = false;
if(canvas)
on_canvas_set();
Color::BlendMethod blend_method(get_blend_method());
const Rect full_bounding_rect(canvas->get_context().get_full_bounding_rect());
- if(context->empty() ||
- !etl::intersect(context.get_full_bounding_rect(),full_bounding_rect+origin))
+ bool blend_using_straight = false; // use 'straight' just for the central blit
+
+ // sometimes the user changes the parameters while we're
+ // rendering, causing our pasted canvas' bounding box to shrink
+ // and no longer overlap with our tile. if that has happened,
+ // let's just stop now - we'll be refreshing soon anyway
+ //! \todo shouldn't a mutex ensure this isn't needed?
+ // http://synfig.org/images/d/d2/Bbox-change.sifz is an example
+ // that shows this happening - open the encapsulation, select the
+ // 'shade', and toggle the 'invert' parameter quickly.
+ // Occasionally you'll see:
+ // error: Context::accelerated_render(): Layer "shade" threw a bad_alloc exception!
+ // where the shade layer tries to allocate itself a canvas of
+ // negative proportions, due to changing bounding boxes.
+ if (!etl::intersect(desc.get_rect(), full_bounding_rect))
{
+ warning("%s:%d bounding box shrank while rendering?", __FILE__, __LINE__);
+ return true;
+ }
+
+ // we have rendered what's under us, if necessary
+ if(context->empty())
+ {
+ // if there's nothing under us, and we're blending 'onto', then we've finished
if (Color::is_onto(blend_method)) return true;
- if (blend_method==Color::BLEND_COMPOSITE) blend_method=Color::BLEND_STRAIGHT;
+
+ // there's nothing under us, so using straight blending is
+ // faster than and equivalent to using composite, but we don't
+ // want to blank the surrounding areas
+ if (blend_method==Color::BLEND_COMPOSITE) blend_using_straight = true;
+ }
+
+ if (!etl::intersect(context.get_full_bounding_rect(),full_bounding_rect+origin))
+ {
+ // if there's no intersection between the context and our surface, and we're rendering 'onto', then we're done
+ if (Color::is_onto(blend_method)) return true;
+
+ /* 'straight' is faster than 'composite' and has the same
+ * effect if the affected area of the lower layer is
+ * transparent; however, if we're not clipping the blit to
+ * just the bounding rectangle, the affected area is the whole
+ * tile, so we can't use this optimisation. if we are
+ * clipping, then we can use 'straight' to blit the clipped
+ * rectangle, but we shouldn't set blend_method to 'straight',
+ * or the surrounding areas will be blanked, which we don't
+ * want.
+ */
+#ifdef SYNFIG_CLIP_PASTECANVAS
+ if (blend_method==Color::BLEND_COMPOSITE) blend_using_straight = true;
+#endif // SYNFIG_CLIP_PASTECANVAS
}
#ifdef SYNFIG_CLIP_PASTECANVAS
const int w( ceil_to_int((max[0] - desc.get_tl()[0]) / desc.get_pw()) - x);
const int h( ceil_to_int((max[1] - desc.get_tl()[1]) / desc.get_ph()) - y);
+ const int tw = desc.get_w();
+ const int th = desc.get_h();
+
desc.set_subwindow(x,y,w,h);
// \todo this used to also have "area.area()<=0.000001 || " - is it useful?
if(cb && !cb->amount_complete(10000,10000)) return false;
return true;
}
+
+ // SYNFIG_CLIP_PASTECANVAS is defined, so we are only touching the
+ // pixels within the affected rectangle. If the blend method is
+ // 'straight', then we need to blend transparent pixels with the
+ // clipped areas of this tile, because with the 'straight' blend
+ // method, even transparent pixels have an effect on the layers below
+ if (Color::is_straight(blend_method))
+ {
+ Surface clearsurface;
+
+ Surface::alpha_pen apen(surface->begin());
+ apen.set_alpha(get_amount());
+
+ // the area we're about to blit is transparent, so it doesn't
+ // matter whether we use 'straight' or 'straight onto' here
+ if (blend_method == Color::BLEND_ALPHA_BRIGHTEN)
+ apen.set_blend_method(blend_method);
+ else
+ apen.set_blend_method(Color::BLEND_STRAIGHT);
+
+ /* This represents the area we're pasting into the tile,
+ * within the tile as a whole. Areas (A), (B), (C) and (D)
+ * need blending with the underlying context if they're not
+ * zero-sized:
+ *
+ * 0 x x+w tw
+ * 0 +------------------------+
+ * | |
+ * | (A) |
+ * | |
+ * y | - - +----------+ - - - |
+ * | | | |
+ * | (C) | w by h | (D) |
+ * | | | |
+ * y+h | - - +----------+ - - - |
+ * | |
+ * | (B) |
+ * | |
+ * tw +------------------------+
+ */
+
+ if (y > 0) // draw the full-width strip above the rectangle (A)
+ { apen.move_to(0,0); clearsurface.set_wh(tw,y); clearsurface.clear(); clearsurface.blit_to(apen); }
+ if (y+h < th) // draw the full-width strip below the rectangle (B)
+ { apen.move_to(0,y+h); clearsurface.set_wh(tw,th-(y+h)); clearsurface.clear(); clearsurface.blit_to(apen); }
+ if (x > 0) // draw the box directly left of the rectangle (C)
+ { apen.move_to(0,y); clearsurface.set_wh(x,h); clearsurface.clear(); clearsurface.blit_to(apen); }
+ if (x+w < tw) // draw the box directly right of the rectangle (D)
+ { apen.move_to(x+w,y); clearsurface.set_wh(tw-(x+w),h); clearsurface.clear(); clearsurface.blit_to(apen); }
+ }
#endif // SYNFIG_CLIP_PASTECANVAS
// render the canvas to be pasted onto pastesurface
#endif // SYNFIG_CLIP_PASTECANVAS
apen.set_alpha(get_amount());
- apen.set_blend_method(blend_method);
+ apen.set_blend_method(blend_using_straight ? Color::BLEND_STRAIGHT : blend_method);
pastesurface.blit_to(apen);
if(cb && !cb->amount_complete(10000,10000)) return false;
projects / synfig.git / blobdiff