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LibGfx: Add an API to retrieve metadata from images
All the data is passed using the `Metadata` object, which has a `main_tags` method. This method should be used when displaying only a few main tags, for example to fill the property window of a file manager. Another method returning the entire list of tags will be implemented later on.
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@ -7,9 +7,11 @@
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/String.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/CMYKBitmap.h>
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#include <LibGfx/Size.h>
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@ -29,6 +31,28 @@ struct VectorImageFrameDescriptor {
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int duration { 0 };
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};
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class Metadata {
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public:
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Metadata() = default;
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virtual ~Metadata() = default;
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HashMap<StringView, String> const& main_tags() const
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{
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if (m_main_tags.is_empty())
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fill_main_tags();
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// This is designed to be used in a general GUI, don't include too much information here.
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VERIFY(m_main_tags.size() < 8);
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return m_main_tags;
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}
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protected:
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virtual void fill_main_tags() const {};
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mutable HashMap<StringView, String> m_main_tags;
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};
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enum class NaturalFrameFormat {
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RGB,
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Grayscale,
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@ -59,6 +83,9 @@ public:
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virtual size_t first_animated_frame_index() { return 0; }
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) = 0;
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virtual Optional<Metadata const&> metadata() { return OptionalNone {}; }
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virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() { return OptionalNone {}; }
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virtual NaturalFrameFormat natural_frame_format() const { return NaturalFrameFormat::RGB; }
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@ -81,7 +108,10 @@ public:
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size_t loop_count() const { return m_plugin->loop_count(); }
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size_t frame_count() const { return m_plugin->frame_count(); }
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size_t first_animated_frame_index() const { return m_plugin->first_animated_frame_index(); }
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ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) const { return m_plugin->frame(index, ideal_size); }
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Optional<Metadata const&> metadata() const { return m_plugin->metadata(); }
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ErrorOr<Optional<ReadonlyBytes>> icc_data() const { return m_plugin->icc_data(); }
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NaturalFrameFormat natural_frame_format() { return m_plugin->natural_frame_format(); }
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