1 files changed, 114 insertions, 0 deletions
diff --git a/Userland/Applications/PixelPaint/Image.h b/Userland/Applications/PixelPaint/Image.h
new file mode 100644
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+++ b/Userland/Applications/PixelPaint/Image.h
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+/*
+ * Copyright (c) 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/HashTable.h>
+#include <AK/NonnullRefPtrVector.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/Vector.h>
+#include <LibGUI/Command.h>
+#include <LibGUI/Forward.h>
+#include <LibGfx/Forward.h>
+#include <LibGfx/Rect.h>
+#include <LibGfx/Size.h>
+
+namespace PixelPaint {
+
+class Layer;
+
+class ImageClient {
+public:
+    virtual void image_did_add_layer(size_t) { }
+    virtual void image_did_remove_layer(size_t) { }
+    virtual void image_did_modify_layer(size_t) { }
+    virtual void image_did_modify_layer_stack() { }
+    virtual void image_did_change() { }
+    virtual void image_select_layer(Layer*) { }
+};
+
+class Image : public RefCounted<Image> {
+public:
+    static RefPtr<Image> create_with_size(const Gfx::IntSize&);
+    static RefPtr<Image> create_from_file(const String& file_path);
+
+    size_t layer_count() const { return m_layers.size(); }
+    const Layer& layer(size_t index) const { return m_layers.at(index); }
+    Layer& layer(size_t index) { return m_layers.at(index); }
+
+    const Gfx::IntSize& size() const { return m_size; }
+    Gfx::IntRect rect() const { return { {}, m_size }; }
+
+    void add_layer(NonnullRefPtr<Layer>);
+    RefPtr<Image> take_snapshot() const;
+    void restore_snapshot(const Image&);
+
+    void paint_into(GUI::Painter&, const Gfx::IntRect& dest_rect);
+    void save(const String& file_path) const;
+    void export_bmp(const String& file_path);
+
+    void move_layer_to_front(Layer&);
+    void move_layer_to_back(Layer&);
+    void move_layer_up(Layer&);
+    void move_layer_down(Layer&);
+    void change_layer_index(size_t old_index, size_t new_index);
+    void remove_layer(Layer&);
+    void select_layer(Layer*);
+
+    void add_client(ImageClient&);
+    void remove_client(ImageClient&);
+
+    void layer_did_modify_bitmap(Badge<Layer>, const Layer&);
+    void layer_did_modify_properties(Badge<Layer>, const Layer&);
+
+    size_t index_of(const Layer&) const;
+
+private:
+    explicit Image(const Gfx::IntSize&);
+
+    void did_change();
+    void did_modify_layer_stack();
+
+    Gfx::IntSize m_size;
+    NonnullRefPtrVector<Layer> m_layers;
+
+    HashTable<ImageClient*> m_clients;
+};
+
+class ImageUndoCommand : public GUI::Command {
+public:
+    ImageUndoCommand(Image& image);
+
+    virtual void undo() override;
+    virtual void redo() override;
+
+private:
+    RefPtr<Image> m_snapshot;
+    Image& m_image;
+};
+
+}