...

1 files changed, 21 insertions, 0 deletions

diff --git a/src/osx/graphics/quartz/Convert.cpp b/src/osx/graphics/quartz/Convert.cpp
index af054e5a..1cd7ea1d 100644
--- a/src/osx/graphics/quartz/Convert.cpp
+++ b/src/osx/graphics/quartz/Convert.cpp
@@ -28,4 +28,25 @@ Rect Convert(const CGRect& rect) {
               static_cast<float>(rect.size.width),
               static_cast<float>(rect.size.height)};
 }
+
+const CGDataProviderSequentialCallbacks kStreamToCGDataProviderCallbacks{
+    1,
+    [](void* stream, void* buffer, size_t size) -> size_t {
+      return static_cast<io::Stream*>(stream)->Read(
+          static_cast<std::byte*>(buffer), size);
+    },
+    [](void* stream, off_t offset) -> off_t {
+      auto s = static_cast<io::Stream*>(stream);
+      auto current_position = s->Tell();
+      s->Seek(offset, io::Stream::SeekOrigin::Current);
+      return s->Tell() - current_position;
+    },
+    [](void* stream) { static_cast<io::Stream*>(stream)->Rewind(); },
+    [](void* stream) {}};
+
+CGDataProviderRef ConvertStreamToCGDataProvider(io::Stream* stream) {
+  return CGDataProviderCreateSequential(stream,
+                                        &kStreamToCGDataProviderCallbacks);
+}
+
 }  // namespace cru::platform::graphics::osx::quartz