diff --git a/src/app/commands/cmd_merge_down_layer.cpp b/src/app/commands/cmd_merge_down_layer.cpp
index 768481e86..7902026b7 100644
--- a/src/app/commands/cmd_merge_down_layer.cpp
+++ b/src/app/commands/cmd_merge_down_layer.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2020  Igara Studio S.A.
+// Copyright (C) 2019-2020  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -26,7 +26,7 @@
 #include "doc/layer.h"
 #include "doc/primitives.h"
 #include "doc/sprite.h"
-#include "render/render.h"
+#include "render/rasterize.h"
 #include "ui/ui.h"
 
 namespace app {
@@ -103,7 +103,8 @@ void MergeDownLayerCommand::onExecute(Context* context)
         // Copy this cel to the destination layer...
 
         // Creating a copy of the image
-        dst_image.reset(Image::createCopy(src_image));
+        dst_image.reset(
+          render::rasterize_with_cel_bounds(src_cel));
 
         // Creating a copy of the cell
         dst_cel = new Cel(frpos, dst_image);
@@ -133,14 +134,10 @@ void MergeDownLayerCommand::onExecute(Context* context)
             bounds.y-dst_cel->y(),
             bounds.w, bounds.h, bgcolor));
 
-        // Merge src_image in new_image
-        render::composite_image(
-          new_image.get(), src_image,
-          sprite->palette(src_cel->frame()),
-          src_cel->x()-bounds.x,
-          src_cel->y()-bounds.y,
-          opacity,
-          src_layer->blendMode());
+        // Draw src_cel on new_image
+        render::rasterize(
+          new_image.get(), src_cel,
+          -bounds.x, -bounds.y, false);
 
         // First unlink the dst_cel
         if (dst_cel->links())
diff --git a/src/app/ui/editor/tool_loop_impl.cpp b/src/app/ui/editor/tool_loop_impl.cpp
index b24547104..a17a353ac 100644
--- a/src/app/ui/editor/tool_loop_impl.cpp
+++ b/src/app/ui/editor/tool_loop_impl.cpp
@@ -53,6 +53,7 @@
 #include "doc/sprite.h"
 #include "fmt/format.h"
 #include "render/dithering.h"
+#include "render/rasterize.h"
 #include "render/render.h"
 #include "ui/ui.h"
 
@@ -430,26 +431,8 @@ public:
       }
       else {
         Cel* cel = m_layer->cel(m_frame);
-        if (cel && (cel->x() != 0 || cel->y() != 0)) {
-          m_floodfillSrcImage = Image::create(m_sprite->spec());
-          m_floodfillSrcImage->clear(m_sprite->transparentColor());
-          if (cel->image()->pixelFormat() == IMAGE_TILEMAP) {
-            render::Render render;
-            render.setNewBlend(Preferences::instance().experimental.newBlend());
-            render.renderCel(
-              m_floodfillSrcImage,
-              m_sprite,
-              cel->image(),
-              m_layer,
-              m_sprite->palette(m_frame),
-              gfx::RectF(cel->bounds()),
-              gfx::Clip(m_sprite->bounds()),
-              255, BlendMode::NORMAL);
-          }
-          else {
-            copy_image(m_floodfillSrcImage, cel->image(), cel->x(), cel->y());
-          }
-        }
+        if (cel && (cel->x() != 0 || cel->y() != 0))
+          m_floodfillSrcImage = render::rasterize_with_sprite_bounds(cel);
       }
     }
 
diff --git a/src/render/CMakeLists.txt b/src/render/CMakeLists.txt
index a9c86e79f..748f08e71 100644
--- a/src/render/CMakeLists.txt
+++ b/src/render/CMakeLists.txt
@@ -1,5 +1,6 @@
 # Aseprite Render Library
-# Copyright (C) 2001-2017 David Capello
+# Copyright (C) 2019  Igara Studio S.A.
+# Copyright (C) 2001-2018 David Capello
 
 add_library(render-lib
   error_diffusion.cpp
@@ -7,6 +8,7 @@ add_library(render-lib
   gradient.cpp
   ordered_dither.cpp
   quantization.cpp
+  rasterize.cpp
   render.cpp
   zoom.cpp)
 
diff --git a/src/render/README.md b/src/render/README.md
index 1ec9f7ce7..e6574d085 100644
--- a/src/render/README.md
+++ b/src/render/README.md
@@ -1,4 +1,5 @@
 # Aseprite Render Library
-*Copyright (C) 2001-2017 David Capello*
 
 > Distributed under [MIT license](LICENSE.txt)
+
+Functions to render a [`doc::Sprite`](../doc/sprite.h).
diff --git a/src/render/rasterize.cpp b/src/render/rasterize.cpp
new file mode 100644
index 000000000..648476e2c
--- /dev/null
+++ b/src/render/rasterize.cpp
@@ -0,0 +1,111 @@
+// Aseprite Render Library
+// Copyright (C) 2019  Igara Studio S.A.
+//
+// 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 "render/rasterize.h"
+
+#include "base/debug.h"
+#include "doc/blend_internals.h"
+#include "doc/cel.h"
+#include "doc/sprite.h"
+#include "render/render.h"
+
+namespace render {
+
+void rasterize(
+  doc::Image* dst,
+  const doc::Cel* cel,
+  const int x,
+  const int y,
+  const bool clear)
+{
+  ASSERT(cel);
+
+  const doc::Sprite* sprite = cel->sprite();
+  ASSERT(sprite);
+
+  if (clear)
+    dst->clear(sprite->transparentColor());
+
+  int t;
+  int opacity;
+  opacity = MUL_UN8(cel->opacity(), cel->layer()->opacity(), t);
+
+  if (cel->image()->pixelFormat() == IMAGE_TILEMAP) {
+    render::Render render;
+    render.renderCel(
+      dst,
+      sprite,
+      cel->image(),
+      cel->layer(),
+      sprite->palette(cel->frame()),
+      gfx::RectF(cel->bounds()),
+      gfx::Clip(x, y, 0, 0, dst->width(), dst->height()),
+      clear ? 255: opacity,
+      clear ? BlendMode::NORMAL: cel->layer()->blendMode());
+  }
+  else {
+    if (clear)
+      copy_image(dst, cel->image(), x+cel->x(), y+cel->y());
+    else
+      composite_image(
+        dst, cel->image(),
+        sprite->palette(cel->frame()),
+        x+cel->x(),
+        y+cel->y(),
+        opacity,
+        cel->layer()->blendMode());
+  }
+}
+
+void rasterize_with_cel_bounds(
+  doc::Image* dst,
+  const doc::Cel* cel)
+{
+  rasterize(dst, cel, -cel->x(), -cel->y(), true);
+}
+
+void rasterize_with_sprite_bounds(
+  doc::Image* dst,
+  const doc::Cel* cel)
+{
+  rasterize(dst, cel, 0, 0, true);
+}
+
+doc::Image* rasterize_with_cel_bounds(
+  const doc::Cel* cel)
+{
+  ASSERT(cel);
+
+  const doc::Sprite* sprite = cel->sprite();
+  ASSERT(sprite);
+
+  doc::ImageSpec spec = sprite->spec();
+  spec.setWidth(cel->bounds().w);
+  spec.setHeight(cel->bounds().h);
+
+  std::unique_ptr<doc::Image> dst(doc::Image::create(spec));
+  rasterize_with_cel_bounds(dst.get(), cel);
+  return dst.release();
+}
+
+doc::Image* rasterize_with_sprite_bounds(
+  const doc::Cel* cel)
+{
+  ASSERT(cel);
+
+  const doc::Sprite* sprite = cel->sprite();
+  ASSERT(sprite);
+
+  std::unique_ptr<doc::Image> dst(doc::Image::create(sprite->spec()));
+  rasterize_with_sprite_bounds(dst.get(), cel);
+  return dst.release();
+}
+
+} // namespace render
diff --git a/src/render/rasterize.h b/src/render/rasterize.h
new file mode 100644
index 000000000..59a05d3be
--- /dev/null
+++ b/src/render/rasterize.h
@@ -0,0 +1,41 @@
+// Aseprite Render Library
+// Copyright (C) 2019  Igara Studio S.A.
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef RENDER_RASTERIZE_H_INCLUDED
+#define RENDER_RASTERIZE_H_INCLUDED
+#pragma once
+
+namespace doc {
+  class Cel;
+  class Image;
+}
+
+namespace render {
+
+  void rasterize(
+    doc::Image* dst,
+    const doc::Cel* cel,
+    const int x,
+    const int y,
+    const bool clear);
+
+  void rasterize_with_cel_bounds(
+    doc::Image* dst,
+    const doc::Cel* cel);
+
+  void rasterize_with_sprite_bounds(
+    doc::Image* dst,
+    const doc::Cel* cel);
+
+  doc::Image* rasterize_with_cel_bounds(
+    const doc::Cel* cel);
+
+  doc::Image* rasterize_with_sprite_bounds(
+    const doc::Cel* cel);
+
+} // namespace render
+
+#endif