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LibGfx: Add an API to retrieve metadata from images

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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.
This commit is contained in:
Lucas CHOLLET 2023-12-28 18:58:45 -05:00 • committed by Andrew Kaster
parent 7962f5e04b
commit e3f976f17a
1 changed files with 30 additions and 0 deletions
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30
Userland/Libraries/LibGfx/ImageFormats/ImageDecoder.h
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@ -7,9 +7,11 @@
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/CMYKBitmap.h>
#include <LibGfx/Size.h>
@ -29,6 +31,28 @@ struct VectorImageFrameDescriptor {
int duration { 0 };
};
class Metadata {
public:
Metadata() = default;
virtual ~Metadata() = default;
HashMap<StringView, String> const& main_tags() const
{
if (m_main_tags.is_empty())
fill_main_tags();
// This is designed to be used in a general GUI, don't include too much information here.
VERIFY(m_main_tags.size() < 8);
return m_main_tags;
}
protected:
virtual void fill_main_tags() const {};
mutable HashMap<StringView, String> m_main_tags;
};
enum class NaturalFrameFormat {
RGB,
Grayscale,
@ -59,6 +83,9 @@ public:
virtual size_t first_animated_frame_index() { return 0; }
virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) = 0;
virtual Optional<Metadata const&> metadata() { return OptionalNone {}; }
virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() { return OptionalNone {}; }
virtual NaturalFrameFormat natural_frame_format() const { return NaturalFrameFormat::RGB; }
@ -81,7 +108,10 @@ public:
size_t loop_count() const { return m_plugin->loop_count(); }
size_t frame_count() const { return m_plugin->frame_count(); }
size_t first_animated_frame_index() const { return m_plugin->first_animated_frame_index(); }
ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) const { return m_plugin->frame(index, ideal_size); }
Optional<Metadata const&> metadata() const { return m_plugin->metadata(); }
ErrorOr<Optional<ReadonlyBytes>> icc_data() const { return m_plugin->icc_data(); }
NaturalFrameFormat natural_frame_format() { return m_plugin->natural_frame_format(); }