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LibGfx: Allow requesting vector graphic frames from ImageDecoder

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Only supported for plugins that set is_vector() to true. This returns
the frames as Gfx::VectorGraphics, which allows painting/rasterizing
them with arbitrary transforms and scales.
This commit is contained in:
MacDue 2023-07-07 22:23:04 +01:00 • committed by Andreas Kling
parent 8784568a36
commit 753cf04be8
3 changed files with 39 additions and 30 deletions
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13
Userland/Libraries/LibGfx/ImageFormats/ImageDecoder.h
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@ -12,6 +12,7 @@
#include <AK/RefPtr.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Size.h>
#include <LibGfx/VectorGraphic.h>
namespace Gfx {
@ -25,6 +26,11 @@ struct ImageFrameDescriptor {
int duration { 0 };
};
struct VectorImageFrameDescriptor {
RefPtr<VectorGraphic> image;
int duration { 0 };
};
class ImageDecoderPlugin {
public:
virtual ~ImageDecoderPlugin() = default;
@ -34,12 +40,16 @@ public:
virtual ErrorOr<void> initialize() { return {}; }
virtual bool is_animated() = 0;
virtual size_t loop_count() = 0;
virtual size_t frame_count() = 0;
virtual size_t first_animated_frame_index() = 0;
virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) = 0;
virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() = 0;
virtual bool is_vector() { return false; }
virtual ErrorOr<VectorImageFrameDescriptor> vector_frame(size_t) { VERIFY_NOT_REACHED(); }
protected:
ImageDecoderPlugin() = default;
};
@ -59,6 +69,9 @@ public:
ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) const { return m_plugin->frame(index, ideal_size); }
ErrorOr<Optional<ReadonlyBytes>> icc_data() const { return m_plugin->icc_data(); }
bool is_vector() { return m_plugin->is_vector(); }
ErrorOr<VectorImageFrameDescriptor> vector_frame(size_t index) { return m_plugin->vector_frame(index); }
private:
explicit ImageDecoder(NonnullOwnPtr<ImageDecoderPlugin>);