82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
#ifndef RESOURCE_BUFFER_H
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#define RESOURCE_BUFFER_H
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#include <stdint.h>
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#if defined(__cplusplus)
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#include "Log.hpp"
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extern "C" {
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#endif
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//
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// Pairs a memory buffer with an ID that can be used to unload the backing asset if needed.
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// Use this when you want to load an asset from a resource that requires more than just `free` on the underlying buffer.
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// e.g.
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// ```
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// uint64_t id = get_next_resource_id();
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// AAsset *asset = AAssetManager_open(am, name, AASSET_MODE_BUFFER);
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// off_t length = AAsset_getLength(asset);
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// const void * buffer = AAsset_getBuffer(asset);
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// uint8_t *buf = new uint8_t[length ];
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// memcpy(buf,buffer, length);
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// ResourceBuffer rb(buf, length, id);
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// ...
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// ...
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// (elsewhere)
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// AAsset* asset = get_asset_from_id(rb.id);
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// AAsset_close(asset);
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// free_asset_id(rb.id);
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//
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struct ResourceBuffer {
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#if defined(__cplusplus)
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ResourceBuffer(const void* const data, const uint32_t size, const uint32_t id) : data(data), size(size), id(id) {};
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#endif
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const void * const data;
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const uint32_t size;
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const uint32_t id;
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};
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typedef struct ResourceBuffer ResourceBuffer;
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typedef ResourceBuffer (*FlutterFilamentLoadResource)(const char* uri);
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typedef ResourceBuffer (*LoadResourceFromOwner)(const char* const, void* const owner);
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typedef void (*FlutterFilamentFreeResource)(ResourceBuffer);
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typedef void (*FreeResourceFromOwner)(ResourceBuffer, void* const owner);
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// this may be compiled as either C or C++, depending on which compiler is being invoked (e.g. binding to Swift will compile as C).
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// the former does not allow default initialization to be specified inline), so we need to explicitly set the unused members to nullptr
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struct ResourceLoaderWrapper {
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#if defined(__cplusplus)
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ResourceLoaderWrapper(FlutterFilamentLoadResource loader, FlutterFilamentFreeResource freeResource) : mLoadResource(loader), mFreeResource(freeResource), mLoadResourceFromOwner(nullptr), mFreeResourceFromOwner(nullptr),
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mOwner(nullptr) {}
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ResourceLoaderWrapper(LoadResourceFromOwner loader, FreeResourceFromOwner freeResource, void* const owner) : mLoadResource(nullptr), mFreeResource(nullptr), mLoadResourceFromOwner(loader), mFreeResourceFromOwner(freeResource), mOwner(owner) {
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};
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ResourceBuffer load(const char* uri) const {
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if(mLoadResourceFromOwner) {
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return mLoadResourceFromOwner(uri, mOwner);
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}
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return mLoadResource(uri);
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}
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void free(ResourceBuffer rb) const {
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if(mFreeResourceFromOwner) {
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mFreeResourceFromOwner(rb, mOwner);
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} else {
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mFreeResource(rb);
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}
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}
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#endif
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FlutterFilamentLoadResource mLoadResource;
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FlutterFilamentFreeResource mFreeResource;
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LoadResourceFromOwner mLoadResourceFromOwner;
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FreeResourceFromOwner mFreeResourceFromOwner;
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void* mOwner;
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};
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typedef struct ResourceLoaderWrapper ResourceLoaderWrapper;
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#if defined(__cplusplus)
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}
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#endif
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#endif
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