1 files changed, 98 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGfx/ImageDecoder.h b/Userland/Libraries/LibGfx/ImageDecoder.h
new file mode 100644
index 0000000000..a054f524a9
--- /dev/null
+++ b/Userland/Libraries/LibGfx/ImageDecoder.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/ByteBuffer.h>
+#include <AK/OwnPtr.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <LibGfx/Size.h>
+
+namespace Gfx {
+
+class Bitmap;
+
+static constexpr size_t maximum_width_for_decoded_images = 16384;
+static constexpr size_t maximum_height_for_decoded_images = 16384;
+
+struct ImageFrameDescriptor {
+    RefPtr<Bitmap> image;
+    int duration { 0 };
+};
+
+class ImageDecoderPlugin {
+public:
+    virtual ~ImageDecoderPlugin() { }
+
+    virtual IntSize size() = 0;
+    virtual RefPtr<Gfx::Bitmap> bitmap() = 0;
+
+    virtual void set_volatile() = 0;
+    [[nodiscard]] virtual bool set_nonvolatile() = 0;
+
+    virtual bool sniff() = 0;
+
+    virtual bool is_animated() = 0;
+    virtual size_t loop_count() = 0;
+    virtual size_t frame_count() = 0;
+    virtual ImageFrameDescriptor frame(size_t i) = 0;
+
+protected:
+    ImageDecoderPlugin() { }
+};
+
+class ImageDecoder : public RefCounted<ImageDecoder> {
+public:
+    static NonnullRefPtr<ImageDecoder> create(const u8* data, size_t size) { return adopt(*new ImageDecoder(data, size)); }
+    static NonnullRefPtr<ImageDecoder> create(const ByteBuffer& data) { return adopt(*new ImageDecoder(data.data(), data.size())); }
+    ~ImageDecoder();
+
+    bool is_valid() const { return m_plugin; }
+
+    IntSize size() const { return m_plugin ? m_plugin->size() : IntSize(); }
+    int width() const { return size().width(); }
+    int height() const { return size().height(); }
+    RefPtr<Gfx::Bitmap> bitmap() const;
+    void set_volatile()
+    {
+        if (m_plugin)
+            m_plugin->set_volatile();
+    }
+    [[nodiscard]] bool set_nonvolatile() { return m_plugin ? m_plugin->set_nonvolatile() : false; }
+    bool sniff() const { return m_plugin ? m_plugin->sniff() : false; }
+    bool is_animated() const { return m_plugin ? m_plugin->is_animated() : false; }
+    size_t loop_count() const { return m_plugin ? m_plugin->loop_count() : 0; }
+    size_t frame_count() const { return m_plugin ? m_plugin->frame_count() : 0; }
+    ImageFrameDescriptor frame(size_t i) const { return m_plugin ? m_plugin->frame(i) : ImageFrameDescriptor(); }
+
+private:
+    ImageDecoder(const u8*, size_t);
+
+    mutable OwnPtr<ImageDecoderPlugin> m_plugin;
+};
+
+}