From 16ebbde26fd66da1e5a78ddd3a8b71d7df14eec7 Mon Sep 17 00:00:00 2001
From: Peter Nelson <peter@peterdn.com>
Date: Sat, 12 Sep 2020 12:20:34 +0100
Subject: [PATCH] LibGfx: add Bitmap::clone() method

---
 Libraries/LibGfx/Bitmap.cpp | 19 +++++++++++++++++++
 Libraries/LibGfx/Bitmap.h   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/Libraries/LibGfx/Bitmap.cpp b/Libraries/LibGfx/Bitmap.cpp
index e7fcfbbaf6..b5e8a8164c 100644
--- a/Libraries/LibGfx/Bitmap.cpp
+++ b/Libraries/LibGfx/Bitmap.cpp
@@ -182,6 +182,25 @@ Bitmap::Bitmap(BitmapFormat format, NonnullRefPtr<SharedBuffer>&& shared_buffer,
         allocate_palette_from_format(m_format, palette);
 }
 
+RefPtr<Gfx::Bitmap> Bitmap::clone() const
+{
+    RefPtr<Gfx::Bitmap> new_bitmap {};
+    if (m_purgeable) {
+        new_bitmap = Bitmap::create_purgeable(format(), size());
+    } else {
+        new_bitmap = Bitmap::create(format(), size());
+    }
+
+    if (!new_bitmap) {
+        return nullptr;
+    }
+
+    ASSERT(size_in_bytes() == new_bitmap->size_in_bytes());
+    memcpy(new_bitmap->scanline(0), scanline(0), size_in_bytes());
+
+    return new_bitmap;
+}
+
 RefPtr<Gfx::Bitmap> Bitmap::rotated(Gfx::RotationDirection rotation_direction) const
 {
     auto w = this->width();
diff --git a/Libraries/LibGfx/Bitmap.h b/Libraries/LibGfx/Bitmap.h
index 022c841b80..3a514543f5 100644
--- a/Libraries/LibGfx/Bitmap.h
+++ b/Libraries/LibGfx/Bitmap.h
@@ -103,6 +103,8 @@ public:
         return false;
     }
 
+    RefPtr<Gfx::Bitmap> clone() const;
+
     RefPtr<Gfx::Bitmap> rotated(Gfx::RotationDirection) const;
     RefPtr<Gfx::Bitmap> flipped(Gfx::Orientation) const;
     RefPtr<Bitmap> to_bitmap_backed_by_shared_buffer() const;