d90795bc3c
No user visible changes expected. For brush assets, we need a way to store a reference to a brush in .blend files, so that the last active brush can be restored from the file. See #101908. It seems like a generally useful thing to have. Adds a new DNA struct to store a "weak" asset reference, that is, a reference that can break under a number of circumstances, but should work reliably enough under normal usage. There's no way to reliably reference an asset currently, so this works on a "best effort" basis. It can break when assets are moved inside the asset library, asset libraries are unregistered from the Preferences, or a file is opened on a different machine with different Preferences, for example. It can also break currently if an asset library is renamed. It contains: - Information to identify the asset library the asset can be found in. - A relative "identifier" (currently a relative path) for the asset within the asset library. There's further code to resolve a weak reference to file paths and Blender library paths. Part of #101908. Co-authored-by: Bastien Montagne <bastien@blender.org> Pull Request: https://projects.blender.org/blender/blender/pulls/105603
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bke
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*/
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#include <memory>
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#include "AS_asset_identifier.hh"
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#include "AS_asset_library.hh"
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#include "BKE_asset.h"
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#include "BLO_read_write.h"
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#include "DNA_asset_types.h"
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#include "MEM_guardedalloc.h"
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using namespace blender;
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/* #AssetWeakReference -------------------------------------------- */
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AssetWeakReference::AssetWeakReference()
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: asset_library_type(0), asset_library_identifier(nullptr), relative_asset_identifier(nullptr)
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{
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}
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AssetWeakReference::AssetWeakReference(AssetWeakReference &&other)
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: asset_library_type(other.asset_library_type),
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asset_library_identifier(other.asset_library_identifier),
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relative_asset_identifier(other.relative_asset_identifier)
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{
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other.asset_library_type = 0; /* Not a valid type. */
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other.asset_library_identifier = nullptr;
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other.relative_asset_identifier = nullptr;
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}
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AssetWeakReference::~AssetWeakReference()
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{
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MEM_delete(asset_library_identifier);
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MEM_delete(relative_asset_identifier);
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}
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void BKE_asset_weak_reference_free(AssetWeakReference **weak_ref)
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{
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MEM_delete(*weak_ref);
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*weak_ref = nullptr;
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}
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AssetWeakReference *BKE_asset_weak_reference_copy(AssetWeakReference *weak_ref)
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{
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if (weak_ref == nullptr) {
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return nullptr;
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}
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AssetWeakReference *weak_ref_copy = MEM_new<AssetWeakReference>(__func__);
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weak_ref_copy->asset_library_type = weak_ref->asset_library_type;
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weak_ref_copy->asset_library_identifier = BLI_strdup(weak_ref->asset_library_identifier);
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weak_ref_copy->relative_asset_identifier = BLI_strdup(weak_ref->relative_asset_identifier);
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return weak_ref_copy;
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}
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std::unique_ptr<AssetWeakReference> AssetWeakReference::make_reference(
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const asset_system::AssetLibrary &library,
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const asset_system::AssetIdentifier &asset_identifier)
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{
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std::unique_ptr weak_ref = std::make_unique<AssetWeakReference>();
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weak_ref->asset_library_type = library.library_type();
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StringRefNull name = library.name();
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if (!name.is_empty()) {
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weak_ref->asset_library_identifier = BLI_strdupn(name.c_str(), name.size());
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}
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StringRefNull relative_identifier = asset_identifier.library_relative_identifier();
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weak_ref->relative_asset_identifier = BLI_strdupn(relative_identifier.c_str(),
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relative_identifier.size());
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return weak_ref;
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}
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void BKE_asset_weak_reference_write(BlendWriter *writer, const AssetWeakReference *weak_ref)
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{
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BLO_write_struct(writer, AssetWeakReference, weak_ref);
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BLO_write_string(writer, weak_ref->asset_library_identifier);
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BLO_write_string(writer, weak_ref->relative_asset_identifier);
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}
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void BKE_asset_weak_reference_read(BlendDataReader *reader, AssetWeakReference *weak_ref)
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{
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BLO_read_data_address(reader, &weak_ref->asset_library_identifier);
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BLO_read_data_address(reader, &weak_ref->relative_asset_identifier);
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}
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