From 080e7e3f683b9f50e32d0ee20b9d31b1a4c60387 Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Mon, 10 Oct 2016 23:42:47 -0300
Subject: [PATCH] Add subpixel bounds for reference layer cels

Now we can move a reference layer cel in a X,Y position with floating
point coordinates (i.e. in a subpixel position).
---
 src/app/CMakeLists.txt                 |  1 +
 src/app/cmd/set_cel_bounds.cpp         | 51 ++++++++++++++
 src/app/cmd/set_cel_bounds.h           | 40 +++++++++++
 src/app/extra_cel.cpp                  |  4 +-
 src/app/ui/editor/editor.cpp           | 11 +++
 src/app/ui/editor/editor.h             |  1 +
 src/app/ui/editor/moving_cel_state.cpp | 81 ++++++++++++++-------
 src/app/ui/editor/moving_cel_state.h   | 10 +--
 src/doc/cel.cpp                        |  7 +-
 src/doc/cel.h                          |  2 +
 src/doc/cel_data.cpp                   | 14 +++-
 src/doc/cel_data.h                     | 31 +++++++-
 src/gfx/CMakeLists.txt                 |  1 -
 src/gfx/clip.cpp                       | 64 -----------------
 src/gfx/clip.h                         | 84 +++++++++++++++++-----
 src/gfx/fwd.h                          |  2 +
 src/render/CMakeLists.txt              |  2 +-
 src/render/projection.h                | 16 +++++
 src/render/render.cpp                  | 98 +++++++++++++-------------
 src/render/render.h                    | 15 ++--
 src/she/surface.h                      |  4 --
 21 files changed, 354 insertions(+), 185 deletions(-)
 create mode 100644 src/app/cmd/set_cel_bounds.cpp
 create mode 100644 src/app/cmd/set_cel_bounds.h
 delete mode 100644 src/gfx/clip.cpp

diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index d5653abd4..1ca0ea29f 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -134,6 +134,7 @@ add_library(app-lib
   cmd/remove_palette.cpp
   cmd/replace_image.cpp
   cmd/reselect_mask.cpp
+  cmd/set_cel_bounds.cpp
   cmd/set_cel_data.cpp
   cmd/set_cel_frame.cpp
   cmd/set_cel_opacity.cpp
diff --git a/src/app/cmd/set_cel_bounds.cpp b/src/app/cmd/set_cel_bounds.cpp
new file mode 100644
index 000000000..dac4c3e99
--- /dev/null
+++ b/src/app/cmd/set_cel_bounds.cpp
@@ -0,0 +1,51 @@
+// Aseprite
+// Copyright (C) 2016  David Capello
+//
+// This program is distributed under the terms of
+// the End-User License Agreement for Aseprite.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/cmd/set_cel_bounds.h"
+
+#include "app/document.h"
+#include "doc/cel.h"
+#include "doc/document_event.h"
+
+namespace app {
+namespace cmd {
+
+using namespace doc;
+
+SetCelBoundsF::SetCelBoundsF(Cel* cel, const gfx::RectF& bounds)
+  : WithCel(cel)
+  , m_oldBounds(cel->boundsF())
+  , m_newBounds(bounds)
+{
+}
+
+void SetCelBoundsF::onExecute()
+{
+  cel()->setBoundsF(m_newBounds);
+  cel()->incrementVersion();
+}
+
+void SetCelBoundsF::onUndo()
+{
+  cel()->setBoundsF(m_oldBounds);
+  cel()->incrementVersion();
+}
+
+void SetCelBoundsF::onFireNotifications()
+{
+  Cel* cel = this->cel();
+  DocumentEvent ev(cel->document());
+  ev.sprite(cel->sprite());
+  ev.cel(cel);
+  cel->document()->notify_observers<DocumentEvent&>(&DocumentObserver::onCelPositionChanged, ev);
+}
+
+} // namespace cmd
+} // namespace app
diff --git a/src/app/cmd/set_cel_bounds.h b/src/app/cmd/set_cel_bounds.h
new file mode 100644
index 000000000..be467ebfc
--- /dev/null
+++ b/src/app/cmd/set_cel_bounds.h
@@ -0,0 +1,40 @@
+// Aseprite
+// Copyright (C) 2016  David Capello
+//
+// This program is distributed under the terms of
+// the End-User License Agreement for Aseprite.
+
+#ifndef APP_CMD_SET_CEL_BOUNDS_H_INCLUDED
+#define APP_CMD_SET_CEL_BOUNDS_H_INCLUDED
+#pragma once
+
+#include "app/cmd.h"
+#include "app/cmd/with_cel.h"
+#include "gfx/rect.h"
+
+namespace app {
+namespace cmd {
+  using namespace doc;
+
+  class SetCelBoundsF : public Cmd
+                      , public WithCel {
+  public:
+    SetCelBoundsF(Cel* cel, const gfx::RectF& bounds);
+
+  protected:
+    void onExecute() override;
+    void onUndo() override;
+    void onFireNotifications() override;
+    size_t onMemSize() const override {
+      return sizeof(*this);
+    }
+
+  private:
+    gfx::RectF m_oldBounds;
+    gfx::RectF m_newBounds;
+  };
+
+} // namespace cmd
+} // namespace app
+
+#endif
diff --git a/src/app/extra_cel.cpp b/src/app/extra_cel.cpp
index 28e895855..9892e91b7 100644
--- a/src/app/extra_cel.cpp
+++ b/src/app/extra_cel.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2001-2015  David Capello
+// Copyright (C) 2001-2016  David Capello
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -44,7 +44,7 @@ void ExtraCel::create(doc::Sprite* sprite,
     m_cel.reset(new doc::Cel(doc::frame_t(0), doc::ImageRef(nullptr)));
   }
 
-  m_cel->setPosition(bounds.origin());
+  m_cel->setBounds(bounds);
   m_cel->setOpacity(opacity);
   m_cel->setFrame(frame);
 }
diff --git a/src/app/ui/editor/editor.cpp b/src/app/ui/editor/editor.cpp
index aadc40da5..8025e434e 100644
--- a/src/app/ui/editor/editor.cpp
+++ b/src/app/ui/editor/editor.cpp
@@ -1028,6 +1028,17 @@ gfx::Point Editor::screenToEditor(const gfx::Point& pt)
     m_proj.removeY(pt.y - vp.y + scroll.y - m_padding.y));
 }
 
+gfx::PointF Editor::screenToEditorF(const gfx::Point& pt)
+{
+  View* view = View::getView(this);
+  Rect vp = view->viewportBounds();
+  Point scroll = view->viewScroll();
+
+  return gfx::PointF(
+    m_proj.removeX<double>(pt.x - vp.x + scroll.x - m_padding.x),
+    m_proj.removeY<double>(pt.y - vp.y + scroll.y - m_padding.y));
+}
+
 Point Editor::editorToScreen(const gfx::Point& pt)
 {
   View* view = View::getView(this);
diff --git a/src/app/ui/editor/editor.h b/src/app/ui/editor/editor.h
index 2fc9068cc..49706c9c1 100644
--- a/src/app/ui/editor/editor.h
+++ b/src/app/ui/editor/editor.h
@@ -150,6 +150,7 @@ namespace app {
     void flashCurrentLayer();
 
     gfx::Point screenToEditor(const gfx::Point& pt);
+    gfx::PointF screenToEditorF(const gfx::Point& pt);
     gfx::Point editorToScreen(const gfx::Point& pt);
     gfx::Rect screenToEditor(const gfx::Rect& rc);
     gfx::Rect editorToScreen(const gfx::Rect& rc);
diff --git a/src/app/ui/editor/moving_cel_state.cpp b/src/app/ui/editor/moving_cel_state.cpp
index c11bfb61d..234a97c53 100644
--- a/src/app/ui/editor/moving_cel_state.cpp
+++ b/src/app/ui/editor/moving_cel_state.cpp
@@ -11,16 +11,17 @@
 #include "app/ui/editor/moving_cel_state.h"
 
 #include "app/app.h"
+#include "app/cmd/set_cel_bounds.h"
 #include "app/context_access.h"
 #include "app/document_api.h"
 #include "app/document_range.h"
+#include "app/transaction.h"
 #include "app/ui/editor/editor.h"
 #include "app/ui/editor/editor_customization_delegate.h"
 #include "app/ui/main_window.h"
 #include "app/ui/status_bar.h"
 #include "app/ui/timeline.h"
 #include "app/ui_context.h"
-#include "app/transaction.h"
 #include "app/util/range_utils.h"
 #include "doc/cel.h"
 #include "doc/layer.h"
@@ -35,6 +36,7 @@ using namespace ui;
 MovingCelState::MovingCelState(Editor* editor, MouseMessage* msg)
   : m_reader(UIContext::instance(), 500)
   , m_canceled(false)
+  , m_hasReference(false)
 {
   ContextWriter writer(m_reader);
   Document* document = editor->document();
@@ -55,12 +57,18 @@ MovingCelState::MovingCelState(Editor* editor, MouseMessage* msg)
 
     if (layer && layer->isMovable() && !layer->isBackground()) {
       m_celList.push_back(cel);
-      m_celStarts.push_back(cel->position());
+
+      if (cel->layer()->isReference()) {
+        m_celStarts.push_back(cel->boundsF());
+        m_hasReference = true;
+      }
+      else
+        m_celStarts.push_back(cel->bounds());
     }
   }
 
-  m_cursorStart = editor->screenToEditor(msg->position());
-  m_celOffset = gfx::Point(0, 0);
+  m_cursorStart = editor->screenToEditorF(msg->position());
+  m_celOffset = gfx::PointF(0, 0);
   editor->captureMouse();
 
   // Hide the mask (temporarily, until mouse-up event)
@@ -71,23 +79,23 @@ MovingCelState::MovingCelState(Editor* editor, MouseMessage* msg)
   }
 }
 
-MovingCelState::~MovingCelState()
-{
-}
-
 bool MovingCelState::onMouseUp(Editor* editor, MouseMessage* msg)
 {
   Document* document = editor->document();
 
   // Here we put back the cel into its original coordinate (so we can
   // add an undoer before).
-  if (m_celOffset != gfx::Point(0, 0)) {
+  if ((m_hasReference && m_celOffset != gfx::PointF(0, 0)) ||
+      (!m_hasReference && gfx::Point(m_celOffset) != gfx::Point(0, 0))) {
     // Put the cels in the original position.
     for (size_t i=0; i<m_celList.size(); ++i) {
       Cel* cel = m_celList[i];
-      const gfx::Point& celStart = m_celStarts[i];
+      const gfx::RectF& celStart = m_celStarts[i];
 
-      cel->setPosition(celStart);
+      if (cel->layer()->isReference())
+        cel->setBoundsF(celStart);
+      else
+        cel->setBounds(gfx::Rect(celStart));
     }
 
     // If the user didn't cancel the operation...
@@ -98,9 +106,18 @@ bool MovingCelState::onMouseUp(Editor* editor, MouseMessage* msg)
 
       // And now we move the cel (or all selected range) to the new position.
       for (Cel* cel : m_celList) {
-        api.setCelPosition(writer.sprite(), cel,
-                           cel->x() + m_celOffset.x,
-                           cel->y() + m_celOffset.y);
+        // Change reference layer with subpixel precision
+        if (cel->layer()->isReference()) {
+          gfx::RectF celBounds = cel->boundsF();
+          celBounds.x += m_celOffset.x;
+          celBounds.y += m_celOffset.y;
+          transaction.execute(new cmd::SetCelBoundsF(cel, celBounds));
+        }
+        else {
+          api.setCelPosition(writer.sprite(), cel,
+                             cel->x() + m_celOffset.x,
+                             cel->y() + m_celOffset.y);
+        }
       }
 
       // Move selection if it was visible
@@ -131,7 +148,7 @@ bool MovingCelState::onMouseUp(Editor* editor, MouseMessage* msg)
 
 bool MovingCelState::onMouseMove(Editor* editor, MouseMessage* msg)
 {
-  gfx::Point newCursorPos = editor->screenToEditor(msg->position());
+  gfx::PointF newCursorPos = editor->screenToEditorF(msg->position());
 
   m_celOffset = newCursorPos - m_cursorStart;
 
@@ -147,9 +164,14 @@ bool MovingCelState::onMouseMove(Editor* editor, MouseMessage* msg)
 
   for (size_t i=0; i<m_celList.size(); ++i) {
     Cel* cel = m_celList[i];
-    const gfx::Point& celStart = m_celStarts[i];
+    gfx::RectF celBounds = m_celStarts[i];
+    celBounds.x += m_celOffset.x;
+    celBounds.y += m_celOffset.y;
 
-    cel->setPosition(celStart + m_celOffset);
+    if (cel->layer()->isReference())
+      cel->setBoundsF(celBounds);
+    else
+      cel->setBounds(gfx::Rect(celBounds));
   }
 
   // Redraw the new cel position.
@@ -161,13 +183,24 @@ bool MovingCelState::onMouseMove(Editor* editor, MouseMessage* msg)
 
 bool MovingCelState::onUpdateStatusBar(Editor* editor)
 {
-  StatusBar::instance()->setStatusText
-    (0,
-     ":pos: %3d %3d :offset: %3d %3d",
-     (int)m_cursorStart.x,
-     (int)m_cursorStart.y,
-     (int)m_celOffset.x,
-     (int)m_celOffset.y);
+  if (m_hasReference) {
+    StatusBar::instance()->setStatusText
+      (0,
+       ":pos: %.2f %.2f :offset: %.2f %.2f",
+       m_cursorStart.x,
+       m_cursorStart.y,
+       m_celOffset.x,
+       m_celOffset.y);
+  }
+  else {
+    StatusBar::instance()->setStatusText
+      (0,
+       ":pos: %3d %3d :offset: %3d %3d",
+       int(m_cursorStart.x),
+       int(m_cursorStart.y),
+       int(m_celOffset.x),
+       int(m_celOffset.y));
+  }
 
   return true;
 }
diff --git a/src/app/ui/editor/moving_cel_state.h b/src/app/ui/editor/moving_cel_state.h
index cbb54be68..d8df83b2a 100644
--- a/src/app/ui/editor/moving_cel_state.h
+++ b/src/app/ui/editor/moving_cel_state.h
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2001-2015  David Capello
+// Copyright (C) 2001-2016  David Capello
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -25,7 +25,6 @@ namespace app {
   class MovingCelState : public StandbyState {
   public:
     MovingCelState(Editor* editor, ui::MouseMessage* msg);
-    virtual ~MovingCelState();
 
     virtual bool onMouseUp(Editor* editor, ui::MouseMessage* msg) override;
     virtual bool onMouseMove(Editor* editor, ui::MouseMessage* msg) override;
@@ -36,11 +35,12 @@ namespace app {
   private:
     ContextReader m_reader;
     CelList m_celList;
-    std::vector<gfx::Point> m_celStarts;
-    gfx::Point m_celOffset;
-    gfx::Point m_cursorStart;
+    std::vector<gfx::RectF> m_celStarts;
+    gfx::PointF m_cursorStart;
+    gfx::PointF m_celOffset;
     bool m_canceled;
     bool m_maskVisible;
+    bool m_hasReference;
   };
 
 } // namespace app
diff --git a/src/doc/cel.cpp b/src/doc/cel.cpp
index ed44dbf34..bffd5d723 100644
--- a/src/doc/cel.cpp
+++ b/src/doc/cel.cpp
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2001-2015 David Capello
+// Copyright (c) 2001-2016 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -77,6 +77,11 @@ void Cel::setBounds(const gfx::Rect& bounds)
   m_data->setBounds(bounds);
 }
 
+void Cel::setBoundsF(const gfx::RectF& bounds)
+{
+  m_data->setBoundsF(bounds);
+}
+
 void Cel::setOpacity(int opacity)
 {
   m_data->setOpacity(opacity);
diff --git a/src/doc/cel.h b/src/doc/cel.h
index aacd1c688..4688fdcf4 100644
--- a/src/doc/cel.h
+++ b/src/doc/cel.h
@@ -35,6 +35,7 @@ namespace doc {
     int y() const { return m_data->position().y; }
     gfx::Point position() const { return m_data->position(); }
     const gfx::Rect& bounds() const { return m_data->bounds(); }
+    const gfx::RectF& boundsF() const { return m_data->boundsF(); }
     int opacity() const { return m_data->opacity(); }
 
     LayerImage* layer() const { return m_layer; }
@@ -55,6 +56,7 @@ namespace doc {
     void setPosition(int x, int y);
     void setPosition(const gfx::Point& pos);
     void setBounds(const gfx::Rect& bounds);
+    void setBoundsF(const gfx::RectF& bounds);
     void setOpacity(int opacity);
 
     virtual int getMemSize() const override {
diff --git a/src/doc/cel_data.cpp b/src/doc/cel_data.cpp
index 0bddecbbb..b83b83883 100644
--- a/src/doc/cel_data.cpp
+++ b/src/doc/cel_data.cpp
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2001-2015 David Capello
+// Copyright (c) 2001-2016 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -20,21 +20,29 @@ namespace doc {
 CelData::CelData(const ImageRef& image)
   : WithUserData(ObjectType::CelData)
   , m_image(image)
+  , m_opacity(255)
   , m_bounds(0, 0,
              image ? image->width(): 0,
              image ? image->height(): 0)
-  , m_opacity(255)
+  , m_boundsF(nullptr)
 {
 }
 
 CelData::CelData(const CelData& celData)
   : WithUserData(ObjectType::CelData)
   , m_image(celData.m_image)
-  , m_bounds(celData.m_bounds)
   , m_opacity(celData.m_opacity)
+  , m_bounds(celData.m_bounds)
+  , m_boundsF(celData.m_boundsF ? new gfx::RectF(*celData.m_boundsF):
+                                  nullptr)
 {
 }
 
+CelData::~CelData()
+{
+  delete m_boundsF;
+}
+
 void CelData::setImage(const ImageRef& image)
 {
   ASSERT(image.get());
diff --git a/src/doc/cel_data.h b/src/doc/cel_data.h
index 3fc2fbf6a..362b867d5 100644
--- a/src/doc/cel_data.h
+++ b/src/doc/cel_data.h
@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (c) 2001-2015 David Capello
+// Copyright (c) 2001-2016 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -20,6 +20,7 @@ namespace doc {
   public:
     CelData(const ImageRef& image);
     CelData(const CelData& celData);
+    ~CelData();
 
     gfx::Point position() const { return m_bounds.origin(); }
     const gfx::Rect& bounds() const { return m_bounds; }
@@ -29,9 +30,29 @@ namespace doc {
 
     void setImage(const ImageRef& image);
     void setPosition(const gfx::Point& pos) { m_bounds.setOrigin(pos); }
-    void setBounds(const gfx::Rect& bounds) { m_bounds = bounds; }
     void setOpacity(int opacity) { m_opacity = opacity; }
 
+    void setBounds(const gfx::Rect& bounds) {
+      m_bounds = bounds;
+      if (m_boundsF)
+        *m_boundsF = gfx::RectF(bounds);
+    }
+
+    void setBoundsF(const gfx::RectF& boundsF) {
+      if (m_boundsF)
+        *m_boundsF = boundsF;
+      else
+        m_boundsF = new gfx::RectF(boundsF);
+
+      m_bounds = gfx::Rect(boundsF);
+    }
+
+    const gfx::RectF& boundsF() const {
+      if (!m_boundsF)
+        m_boundsF = new gfx::RectF(m_bounds);
+      return *m_boundsF;
+    }
+
     virtual int getMemSize() const override {
       ASSERT(m_image);
       return sizeof(CelData) + m_image->getMemSize();
@@ -39,8 +60,12 @@ namespace doc {
 
   private:
     ImageRef m_image;
-    gfx::Rect m_bounds;
     int m_opacity;
+    gfx::Rect m_bounds;
+
+    // Special bounds for reference layers that can have subpixel
+    // position.
+    mutable gfx::RectF* m_boundsF;
   };
 
   typedef base::SharedPtr<CelData> CelDataRef;
diff --git a/src/gfx/CMakeLists.txt b/src/gfx/CMakeLists.txt
index 7a92f18df..f3111b736 100644
--- a/src/gfx/CMakeLists.txt
+++ b/src/gfx/CMakeLists.txt
@@ -2,7 +2,6 @@
 # Copyright (C) 2001-2016  David Capello
 
 add_library(gfx-lib
-  clip.cpp
   hsv.cpp
   packing_rects.cpp
   region.cpp
diff --git a/src/gfx/clip.cpp b/src/gfx/clip.cpp
deleted file mode 100644
index 3bf84533b..000000000
--- a/src/gfx/clip.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-// Aseprite Gfx Library
-// Copyright (c) 2001-2014 David Capello
-//
-// This file is released under the terms of the MIT license.
-// Read LICENSE.txt for more information.
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "gfx/clip.h"
-
-namespace gfx {
-
-bool Clip::clip(
-  int avail_dst_w,
-  int avail_dst_h,
-  int avail_src_w,
-  int avail_src_h)
-{
-  // Clip srcBounds
-
-  if (src.x < 0) {
-    size.w += src.x;
-    dst.x -= src.x;
-    src.x = 0;
-  }
-
-  if (src.y < 0) {
-    size.h += src.y;
-    dst.y -= src.y;
-    src.y = 0;
-  }
-
-  if (src.x + size.w > avail_src_w)
-    size.w -= src.x + size.w - avail_src_w;
-
-  if (src.y + size.h > avail_src_h)
-    size.h -= src.y + size.h - avail_src_h;
-
-  // Clip dstBounds
-
-  if (dst.x < 0) {
-    size.w += dst.x;
-    src.x -= dst.x;
-    dst.x = 0;
-  }
-
-  if (dst.y < 0) {
-    size.h += dst.y;
-    src.y -= dst.y;
-    dst.y = 0;
-  }
-
-  if (dst.x + size.w > avail_dst_w)
-    size.w -= dst.x + size.w - avail_dst_w;
-
-  if (dst.y + size.h > avail_dst_h)
-    size.h -= dst.y + size.h - avail_dst_h;
-
-  return (size.w > 0 && size.h > 0);
-}
-
-} // namespace gfx
diff --git a/src/gfx/clip.h b/src/gfx/clip.h
index 2bab34163..a8ad02f8a 100644
--- a/src/gfx/clip.h
+++ b/src/gfx/clip.h
@@ -1,5 +1,5 @@
 // Aseprite Gfx Library
-// Copyright (c) 2001-2014 David Capello
+// Copyright (c) 2001-2016 David Capello
 //
 // This file is released under the terms of the MIT license.
 // Read LICENSE.txt for more information.
@@ -14,58 +14,59 @@
 
 namespace gfx {
 
-  class Clip {
+  template<typename T>
+  class ClipT {
   public:
-    Point dst;
-    Point src;
-    Size size;
+    PointT<T> dst;
+    PointT<T> src;
+    SizeT<T> size;
 
-    Clip()
+    ClipT()
       : dst(0, 0)
       , src(0, 0)
       , size(0, 0) {
     }
 
-    Clip(int w, int h)
+    ClipT(T w, T h)
       : dst(0, 0)
       , src(0, 0)
       , size(w, h) {
     }
 
-    Clip(int dst_x, int dst_y, int src_x, int src_y, int w, int h)
+    ClipT(T dst_x, T dst_y, T src_x, T src_y, T w, T h)
       : dst(dst_x, dst_y)
       , src(src_x, src_y)
       , size(w, h) {
     }
 
-    Clip(int dst_x, int dst_y, const Rect& srcBounds)
+    ClipT(T dst_x, T dst_y, const RectT<T>& srcBounds)
       : dst(dst_x, dst_y)
       , src(srcBounds.x, srcBounds.y)
       , size(srcBounds.w, srcBounds.h) {
     }
 
-    Clip(const Point& dst, const Point& src, const Size& size)
+    ClipT(const PointT<T>& dst, const PointT<T>& src, const SizeT<T>& size)
       : dst(dst)
       , src(src)
       , size(size) {
     }
 
-    Clip(const Point& dst, const Rect& srcBounds)
+    ClipT(const PointT<T>& dst, const RectT<T>& srcBounds)
       : dst(dst)
       , src(srcBounds.x, srcBounds.y)
       , size(srcBounds.w, srcBounds.h) {
     }
 
-    Clip(const Rect& bounds)
+    ClipT(const RectT<T>& bounds)
       : dst(bounds.x, bounds.y)
       , src(bounds.x, bounds.y)
       , size(bounds.w, bounds.h) {
     }
 
-    Rect dstBounds() const { return Rect(dst, size); }
-    Rect srcBounds() const { return Rect(src, size); }
+    RectT<T> dstBounds() const { return RectT<T>(dst, size); }
+    RectT<T> srcBounds() const { return RectT<T>(src, size); }
 
-    bool operator==(const Clip& other) const {
+    bool operator==(const ClipT<T>& other) const {
       return (dst == other.dst &&
         src == other.src &&
         size == other.size);
@@ -73,13 +74,58 @@ namespace gfx {
 
     bool clip(
       // Available area
-      int avail_dst_w,
-      int avail_dst_h,
-      int avail_src_w,
-      int avail_src_h);
+      T avail_dst_w,
+      T avail_dst_h,
+      T avail_src_w,
+      T avail_src_h) {
+      // Clip srcBounds
+
+      if (src.x < T(0)) {
+        size.w += src.x;
+        dst.x -= src.x;
+        src.x = T(0);
+      }
+
+      if (src.y < T(0)) {
+        size.h += src.y;
+        dst.y -= src.y;
+        src.y = T(0);
+      }
+
+      if (src.x + size.w > avail_src_w)
+        size.w -= src.x + size.w - avail_src_w;
+
+      if (src.y + size.h > avail_src_h)
+        size.h -= src.y + size.h - avail_src_h;
+
+      // Clip dstBounds
+
+      if (dst.x < T(0)) {
+        size.w += dst.x;
+        src.x -= dst.x;
+        dst.x = T(0);
+      }
+
+      if (dst.y < T(0)) {
+        size.h += dst.y;
+        src.y -= dst.y;
+        dst.y = T(0);
+      }
+
+      if (dst.x + size.w > avail_dst_w)
+        size.w -= dst.x + size.w - avail_dst_w;
+
+      if (dst.y + size.h > avail_dst_h)
+        size.h -= dst.y + size.h - avail_dst_h;
+
+      return (size.w > T(0) && size.h > T(0));
+    }
 
   };
 
+  typedef ClipT<int> Clip;
+  typedef ClipT<double> ClipF;
+
 } // namespace gfx
 
 #endif
diff --git a/src/gfx/fwd.h b/src/gfx/fwd.h
index 44ae4d9d3..2b1ba5a7f 100644
--- a/src/gfx/fwd.h
+++ b/src/gfx/fwd.h
@@ -11,11 +11,13 @@
 namespace gfx {
 
 template<typename T> class BorderT;
+template<typename T> class ClipT;
 template<typename T> class PointT;
 template<typename T> class RectT;
 template<typename T> class SizeT;
 
 typedef BorderT<int> Border;
+typedef ClipT<int> Clip;
 typedef PointT<int> Point;
 typedef RectT<int> Rect;
 typedef SizeT<int> Size;
diff --git a/src/render/CMakeLists.txt b/src/render/CMakeLists.txt
index 9a97e5d4d..edd940ab1 100644
--- a/src/render/CMakeLists.txt
+++ b/src/render/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Aseprite Render Library
-# Copyright (C) 2001-2015 David Capello
+# Copyright (C) 2001-2016 David Capello
 
 add_library(render-lib
   get_sprite_pixel.cpp
diff --git a/src/render/projection.h b/src/render/projection.h
index a6f460e03..d8e479269 100644
--- a/src/render/projection.h
+++ b/src/render/projection.h
@@ -55,6 +55,14 @@ namespace render {
                        applyY(r.y+r.h) - v);
     }
 
+    gfx::RectF apply(const gfx::RectF& r) const {
+      double u = applyX(r.x);
+      double v = applyY(r.y);
+      return gfx::RectF(u, v,
+                        applyX(r.x+r.w) - u,
+                        applyY(r.y+r.h) - v);
+    }
+
     gfx::Rect remove(const gfx::Rect& r) const {
       int u = removeX(r.x);
       int v = removeY(r.y);
@@ -63,6 +71,14 @@ namespace render {
                        removeY(r.y+r.h) - v);
     }
 
+    gfx::RectF remove(const gfx::RectF& r) const {
+      double u = removeX(r.x);
+      double v = removeY(r.y);
+      return gfx::RectF(u, v,
+                        removeX(r.x+r.w) - u,
+                        removeY(r.y+r.h) - v);
+    }
+
   private:
     doc::PixelRatio m_pixelRatio;
     Zoom m_zoom;
diff --git a/src/render/render.cpp b/src/render/render.cpp
index bab761567..de477a5b2 100644
--- a/src/render/render.cpp
+++ b/src/render/render.cpp
@@ -446,33 +446,33 @@ void composite_image_scale_down_non_square_pixel_ratio(
 template<class DstTraits, class SrcTraits>
 void composite_image_general(
   Image* dst, const Image* src, const Palette* pal,
-  const gfx::Clip& _area,
+  const gfx::ClipF& _area,
   const int opacity,
   const BlendMode blendMode,
-  const Projection& proj)
+  const double sx,
+  const double sy)
 {
   ASSERT(dst);
   ASSERT(src);
   ASSERT(DstTraits::pixel_format == dst->pixelFormat());
   ASSERT(SrcTraits::pixel_format == src->pixelFormat());
 
-  gfx::Clip area = _area;
+  gfx::ClipF area = _area;
   if (!area.clip(dst->width(), dst->height(),
-                 proj.applyX(src->width()),
-                 proj.applyY(src->height())))
+                 sx*src->width(), sy*src->height()))
     return;
 
   BlenderHelper<DstTraits, SrcTraits> blender(src, pal, blendMode);
 
-  gfx::Rect dstBounds = area.dstBounds();
-  gfx::Rect srcBounds = area.srcBounds();
+  gfx::RectF dstBounds = area.dstBounds();
+  gfx::RectF srcBounds = area.srcBounds();
 
-  for (int y=0; y<dstBounds.h; ++y) {
-    for (int x=0; x<dstBounds.w; ++x) {
-      int dstX = dstBounds.x+x;
-      int dstY = dstBounds.y+y;
-      int srcX = proj.removeX(srcBounds.x+x);
-      int srcY = proj.removeY(srcBounds.y+y);
+  int dstY = dstBounds.y;
+  for (int y=0; y<dstBounds.h; ++y, ++dstY) {
+    int dstX = dstBounds.x;
+    for (int x=0; x<dstBounds.w; ++x, ++dstX) {
+      int srcX = (srcBounds.x+x)/sx;
+      int srcY = (srcBounds.y+y)/sy;
 
       if (srcX >= 0 && srcX < src->width() &&
           srcY >= 0 && srcY < src->height() &&
@@ -775,8 +775,9 @@ void Render::renderSprite(
       dstImage,
       m_previewImage,
       m_sprite->palette(frame),
-      m_previewPos.x,
-      m_previewPos.y,
+      gfx::Rect(m_previewPos.x, m_previewPos.y,
+                m_previewImage->width(),
+                m_previewImage->height()),
       area,
       compositeImage,
       255,
@@ -899,19 +900,21 @@ void Render::renderImage(
   const int opacity,
   const BlendMode blendMode)
 {
-  CompositeImageFunc compositeImage = get_image_composition(
-    dst_image->pixelFormat(),
-    src_image->pixelFormat(), m_proj);
+  CompositeImageFunc compositeImage =
+    get_image_composition(
+      dst_image->pixelFormat(),
+      src_image->pixelFormat(), m_proj);
   if (!compositeImage)
     return;
 
   compositeImage(
     dst_image, src_image, pal,
-    gfx::Clip(x, y, 0, 0,
-              m_proj.applyX(src_image->width()),
-              m_proj.applyY(src_image->height())),
+    gfx::ClipF(x, y, 0, 0,
+               m_proj.applyX(src_image->width()),
+               m_proj.applyY(src_image->height())),
     opacity, blendMode,
-    m_proj);
+    m_proj.scaleX(),
+    m_proj.scaleY());
 }
 
 void Render::renderLayer(
@@ -960,21 +963,27 @@ void Render::renderLayer(
       if (cel) {
         Palette* pal = m_sprite->palette(frame);
         const Image* celImage;
-        gfx::Point celPos;
+        gfx::RectF celBounds;
 
         // Is the 'm_previewImage' set to be used with this layer?
         if ((m_previewImage) &&
             (m_selectedLayer == layer) &&
             (m_selectedFrame == frame)) {
           celImage = m_previewImage;
-          celPos = m_previewPos;
+          celBounds = gfx::RectF(m_previewPos.x,
+                                 m_previewPos.y,
+                                 m_previewImage->width(),
+                                 m_previewImage->height());
 
           ASSERT(celImage->pixelFormat() == cel->image()->pixelFormat());
         }
         // If not, we use the original cel-image from the images' stock
         else {
           celImage = cel->image();
-          celPos = cel->position();
+          if (cel->layer()->isReference())
+            celBounds = cel->boundsF();
+          else
+            celBounds = cel->bounds();
         }
 
         if (celImage) {
@@ -1005,7 +1014,7 @@ void Render::renderLayer(
 
             for (auto rc : originalAreas) {
               renderCel(
-                image, celImage, pal, celPos,
+                image, celImage, pal, celBounds,
                 gfx::Clip(area.dst.x+rc.x-area.src.x,
                           area.dst.y+rc.y-area.src.y, rc), compositeImage,
                 opacity, layerBlendMode);
@@ -1015,7 +1024,7 @@ void Render::renderLayer(
           else {
             renderCel(
               image, celImage, pal,
-              celPos, area, compositeImage,
+              celBounds, area, compositeImage,
               opacity, layerBlendMode);
           }
         }
@@ -1044,7 +1053,7 @@ void Render::renderLayer(
       renderCel(
         image, m_extraImage,
         m_sprite->palette(frame),
-        m_extraCel->position(),
+        m_extraCel->bounds(),
         gfx::Clip(area.dst.x+extraArea.x-area.src.x,
                   area.dst.y+extraArea.y-area.src.y,
                   extraArea),
@@ -1059,7 +1068,7 @@ void Render::renderCel(
   Image* dst_image,
   const Image* cel_image,
   const Palette* pal,
-  const gfx::Point& celPos,
+  const gfx::RectF& celBounds,
   const gfx::Clip& area,
   const CompositeImageFunc compositeImage,
   const int opacity,
@@ -1068,8 +1077,7 @@ void Render::renderCel(
   renderImage(dst_image,
               cel_image,
               pal,
-              celPos.x,
-              celPos.y,
+              celBounds,
               area,
               compositeImage,
               opacity,
@@ -1080,38 +1088,30 @@ void Render::renderImage(
   Image* dst_image,
   const Image* cel_image,
   const Palette* pal,
-  const int x,
-  const int y,
+  const gfx::RectF& celBounds,
   const gfx::Clip& area,
   const CompositeImageFunc compositeImage,
   const int opacity,
   const BlendMode blendMode)
 {
-  int cel_x = m_proj.applyX(x);
-  int cel_y = m_proj.applyY(y);
-
-  gfx::Rect srcBounds =
-    area.srcBounds().createIntersection(
-      gfx::Rect(
-        cel_x,
-        cel_y,
-        m_proj.applyX(cel_image->width()),
-        m_proj.applyY(cel_image->height())));
+  gfx::RectF scaledBounds = m_proj.apply(celBounds);
+  gfx::RectF srcBounds = gfx::RectF(area.srcBounds()).createIntersection(scaledBounds);
   if (srcBounds.isEmpty())
     return;
 
   compositeImage(
     dst_image, cel_image, pal,
-    gfx::Clip(
-      area.dst.x + srcBounds.x - area.src.x,
-      area.dst.y + srcBounds.y - area.src.y,
-      srcBounds.x - cel_x,
-      srcBounds.y - cel_y,
+    gfx::ClipF(
+      double(area.dst.x) + srcBounds.x - double(area.src.x),
+      double(area.dst.y) + srcBounds.y - double(area.src.y),
+      srcBounds.x - scaledBounds.x,
+      srcBounds.y - scaledBounds.y,
       srcBounds.w,
       srcBounds.h),
     opacity,
     blendMode,
-    m_proj);
+    m_proj.scaleX() * double(cel_image->width()) / celBounds.w,
+    m_proj.scaleY() * double(cel_image->height()) / celBounds.h);
 }
 
 void composite_image(Image* dst,
diff --git a/src/render/render.h b/src/render/render.h
index c1f945ba5..23b8893b9 100644
--- a/src/render/render.h
+++ b/src/render/render.h
@@ -13,16 +13,13 @@
 #include "doc/color.h"
 #include "doc/frame.h"
 #include "doc/pixel_format.h"
+#include "gfx/clip.h"
 #include "gfx/point.h"
 #include "gfx/size.h"
 #include "render/extra_type.h"
 #include "render/onionskin_position.h"
 #include "render/projection.h"
 
-namespace gfx {
-  class Clip;
-}
-
 namespace doc {
   class Cel;
   class FrameTag;
@@ -93,10 +90,11 @@ namespace render {
     Image* dst,
     const Image* src,
     const Palette* pal,
-    const gfx::Clip& area,
+    const gfx::ClipF& area,
     const int opacity,
     const BlendMode blendMode,
-    const Projection& proj);
+    const double sx,
+    const double sy);
 
   class Render {
   public:
@@ -194,7 +192,7 @@ namespace render {
       Image* dst_image,
       const Image* cel_image,
       const Palette* pal,
-      const gfx::Point& celPos,
+      const gfx::RectF& celBounds,
       const gfx::Clip& area,
       const CompositeImageFunc compositeImage,
       const int opacity,
@@ -204,8 +202,7 @@ namespace render {
       Image* dst_image,
       const Image* cel_image,
       const Palette* pal,
-      const int x,
-      const int y,
+      const gfx::RectF& celBounds,
       const gfx::Clip& area,
       const CompositeImageFunc compositeImage,
       const int opacity,
diff --git a/src/she/surface.h b/src/she/surface.h
index 173903165..c11057a0a 100644
--- a/src/she/surface.h
+++ b/src/she/surface.h
@@ -14,10 +14,6 @@
 
 #include <string>
 
-namespace gfx {
-  class Clip;
-}
-
 namespace she {
 
   class Font;