PixelPaint: Add `Copy Merged` action

This allows the user to copy the merged bitmap (all visible layers).

Userland/Applications/PixelPaint/Image.cpp

@@ -8,6 +8,7 @@
 
 #include "Image.h"
 #include "Layer.h"
+#include "Selection.h"
 #include <AK/Base64.h>
 #include <AK/JsonObject.h>
 #include <AK/JsonObjectSerializer.h>
@@ -173,6 +174,20 @@ RefPtr<Gfx::Bitmap> Image::try_compose_bitmap(Gfx::BitmapFormat format) const
     return bitmap;
 }
 
+RefPtr<Gfx::Bitmap> Image::try_copy_bitmap(Selection const& selection) const
+{
+    if (selection.is_empty())
+        return {};
+    auto selection_rect = selection.bounding_rect();
+
+    // FIXME: Add a way to only compose a certain part of the image
+    auto full_bitmap = try_compose_bitmap(Gfx::BitmapFormat::BGRA8888);
+    if (!full_bitmap)
+        return {};
+
+    return full_bitmap->cropped(selection_rect);
+}
+
 Result<void, String> Image::export_bmp_to_fd_and_close(int fd, bool preserve_alpha_channel)
 {
     auto file = Core::File::construct();

Userland/Applications/PixelPaint/Image.h

@@ -26,6 +26,7 @@
 namespace PixelPaint {
 
 class Layer;
+class Selection;
 
 class ImageClient {
 public:
@@ -53,6 +54,7 @@ public:
 
     // This generates a new Bitmap with the final image (all layers composed according to their attributes.)
     RefPtr<Gfx::Bitmap> try_compose_bitmap(Gfx::BitmapFormat format) const;
+    RefPtr<Gfx::Bitmap> try_copy_bitmap(Selection const&) const;
 
     size_t layer_count() const { return m_layers.size(); }
     Layer const& layer(size_t index) const { return m_layers.at(index); }

Userland/Applications/PixelPaint/main.cpp

@@ -256,6 +256,20 @@ int main(int argc, char** argv)
         }
         GUI::Clipboard::the().set_bitmap(*bitmap);
     });
+    auto copy_merged_action = GUI::Action::create(
+        "Copy &Merged", { Mod_Ctrl | Mod_Shift, Key_C }, Gfx::Bitmap::try_load_from_file("/res/icons/16x16/edit-copy.png"),
+        [&](auto&) {
+            auto* editor = current_image_editor();
+            if (!editor)
+                return;
+            auto bitmap = editor->image().try_copy_bitmap(editor->selection());
+            if (!bitmap) {
+                dbgln("try_copy_bitmap() from Image failed");
+                return;
+            }
+            GUI::Clipboard::the().set_bitmap(*bitmap);
+        },
+        window);
 
     auto paste_action = GUI::CommonActions::make_paste_action([&](auto&) {
         auto* editor = current_image_editor();
@@ -277,6 +291,7 @@ int main(int argc, char** argv)
     paste_action->set_enabled(GUI::Clipboard::the().mime_type() == "image/x-serenityos");
 
     edit_menu.add_action(copy_action);
+    edit_menu.add_action(copy_merged_action);
     edit_menu.add_action(paste_action);
 
     auto undo_action = GUI::CommonActions::make_undo_action([&](auto&) {