LibGfx: Move all image loaders and writers to a subdirectory

Userland/Libraries/LibGfx/ImageFormats/PNGWriter.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2021, Pierre Hoffmeister
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Optional.h>
+#include <AK/Vector.h>
+#include <LibGfx/Forward.h>
+#include <LibGfx/ImageFormats/PNGShared.h>
+
+namespace Gfx {
+
+class PNGChunk;
+
+// This is not a nested struct to work around https://llvm.org/PR36684
+struct PNGWriterOptions {
+    // Data for the iCCP chunk.
+    // FIXME: Allow writing cICP, sRGB, or gAMA instead too.
+    Optional<ReadonlyBytes> icc_data;
+};
+
+class PNGWriter {
+public:
+    using Options = PNGWriterOptions;
+
+    static ErrorOr<ByteBuffer> encode(Gfx::Bitmap const&, Options options = Options {});
+
+private:
+    PNGWriter() = default;
+
+    Vector<u8> m_data;
+    ErrorOr<void> add_chunk(PNGChunk&);
+    ErrorOr<void> add_png_header();
+    ErrorOr<void> add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG::ColorType color_type, u8 compression_method, u8 filter_method, u8 interlace_method);
+    ErrorOr<void> add_iCCP_chunk(ReadonlyBytes icc_data);
+    ErrorOr<void> add_IDAT_chunk(Gfx::Bitmap const&);
+    ErrorOr<void> add_IEND_chunk();
+};
+
+}