Fix crash copying floating tilemaps

src/app/ui/editor/moving_pixels_state.cpp

@@ -630,10 +630,21 @@ void MovingPixelsState::onBeforeCommandExecution(CommandExecutionEvent& ev)
       std::unique_ptr<Mask> floatingMask;
       m_pixelsMovement->getDraggedImageCopy(floatingImage, floatingMask);
 
-      Clipboard::instance()->
-        copyImage(floatingImage.get(),
-                  floatingMask.get(),
-                  document->sprite()->palette(m_editor->frame()));
+      if (floatingImage->isTilemap()) {
+        Site site = m_editor->getSite();
+        ASSERT(site.tileset());
+        Clipboard::instance()->
+          copyTilemap(floatingImage.get(),
+                      floatingMask.get(),
+                      document->sprite()->palette(m_editor->frame()),
+                      site.tileset());
+      }
+      else {
+        Clipboard::instance()->
+          copyImage(floatingImage.get(),
+                    floatingMask.get(),
+                    document->sprite()->palette(m_editor->frame()));
+      }
     }
 
     // Clear floating pixels on Cut/Clear.

src/app/ui/editor/pixels_movement.cpp

@@ -716,9 +716,22 @@ void PixelsMovement::getDraggedImageCopy(std::unique_ptr<Image>& outputImage,
   if (bounds.isEmpty())
     return;
 
+  doc::PixelFormat pixelFormat;
+  gfx::Size imgSize;
+  if (m_site.tilemapMode() == TilemapMode::Tiles) {
+    imgSize = m_site.grid().canvasToTile(bounds).size();
+    pixelFormat = IMAGE_TILEMAP;
+  }
+  else {
+    imgSize = bounds.size();
+    pixelFormat = m_site.sprite()->pixelFormat();
+  }
+
   std::unique_ptr<Image> image(
     Image::create(
-      m_site.sprite()->pixelFormat(), bounds.w, bounds.h));
+      pixelFormat,
+      imgSize.w,
+      imgSize.h));
 
   drawImage(m_currentData, image.get(),
             gfx::PointF(bounds.origin()), false);
@@ -1177,12 +1190,8 @@ static void merge_tilemaps(Image* dst, const Image* src, gfx::Clip area)
   ImageConstIterator<TilemapTraits> src_it(src, area.srcBounds(), area.src.x, area.src.y);
   ImageIterator<TilemapTraits> dst_it(dst, area.dstBounds(), area.dst.x, area.dst.y);
 
-  int end_x = area.dst.x+area.size.w;
-
-  for (int end_y=area.dst.y+area.size.h;
-       area.dst.y<end_y;
-       ++area.dst.y, ++area.src.y) {
-    for (int x=area.dst.x; x<end_x; ++x) {
+  for (int y=0; y<area.size.h; ++y) {
+    for (int x=0; x<area.size.w; ++x) {
       if (*src_it != doc::notile)
         *dst_it = *src_it;
       ++src_it;
@@ -1195,6 +1204,9 @@ void PixelsMovement::drawTransformedTilemap(
   const Transformation& transformation,
   doc::Image* dst, const doc::Image* src, const doc::Mask* mask)
 {
+  ASSERT(dst->pixelFormat() == IMAGE_TILEMAP);
+  ASSERT(src->pixelFormat() == IMAGE_TILEMAP);
+
   const int boxw = std::max(1, src->width()-2);
   const int boxh = std::max(1, src->height()-2);
 

src/app/util/clipboard.cpp

@@ -416,6 +416,7 @@ void Clipboard::copyImage(const Image* image,
                           const Mask* mask,
                           const Palette* pal)
 {
+  ASSERT(image->pixelFormat() != IMAGE_TILEMAP);
   setData(
     Image::createCopy(image),
     (mask ? new Mask(*mask): nullptr),
@@ -424,6 +425,20 @@ void Clipboard::copyImage(const Image* image,
     true, false);
 }
 
+void Clipboard::copyTilemap(const Image* image,
+                            const Mask* mask,
+                            const Palette* pal,
+                            const Tileset* tileset)
+{
+  ASSERT(image->pixelFormat() == IMAGE_TILEMAP);
+  setData(
+    Image::createCopy(image),
+    (mask ? new Mask(*mask): nullptr),
+    (pal ? new Palette(*pal): nullptr),
+    Tileset::MakeCopyCopyingImages(tileset),
+    true, false);
+}
+
 void Clipboard::copyPalette(const Palette* palette,
                             const PalettePicks& picks)
 {

src/app/util/clipboard.h

@@ -68,6 +68,10 @@ namespace app {
     void copyImage(const doc::Image* image,
                    const doc::Mask* mask,
                    const doc::Palette* palette);
+    void copyTilemap(const doc::Image* image,
+                     const doc::Mask* mask,
+                     const doc::Palette* pal,
+                     const doc::Tileset* tileset);
     void copyPalette(const doc::Palette* palette,
                      const doc::PalettePicks& picks);
     void paste(Context* ctx, const bool interactive);