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fa393f1c52
The previous loader cache mechanism encountered a problem when the user changed the content of the cached data. In such cases, a new request would not be processed because the renderer would use the previously cached content. So far, the TVG cache mechanism utilizes a pointer hash key for the fastest hashing mechanism available. One limitation is that it assumes the address is unique for the data. To resolve this, we modified the caching policy. Now, the renderer will not cache copied data; it will only cache the given data when it is deemed shareable. issue: https://github.com/thorvg/thorvg/issues/2020
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
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* Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _TVG_LOAD_MODULE_H_
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#define _TVG_LOAD_MODULE_H_
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#include "tvgRender.h"
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#include "tvgInlist.h"
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struct LoadModule
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{
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INLIST_ITEM(LoadModule);
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//Use either hashkey(data) or hashpath(path)
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union {
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uintptr_t hashkey;
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char* hashpath = nullptr;
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};
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FileType type; //current loader file type
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uint16_t sharing = 0; //reference count
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bool readied = false; //read done already.
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bool pathcache = false; //cached by path
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LoadModule(FileType type) : type(type) {}
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virtual ~LoadModule()
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{
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if (pathcache) free(hashpath);
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}
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virtual bool open(const string& path) { return false; }
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virtual bool open(const char* data, uint32_t size, bool copy) { return false; }
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virtual bool resize(Paint* paint, float w, float h) { return false; }
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virtual void sync() {}; //finish immediately if any async update jobs.
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virtual bool read()
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{
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if (readied) return false;
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readied = true;
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return true;
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}
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bool cached()
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{
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if (hashkey) return true;
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return false;
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}
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virtual bool close()
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{
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if (sharing == 0) return true;
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--sharing;
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return false;
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}
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};
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struct ImageLoader : LoadModule
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{
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static ColorSpace cs; //desired value
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float w = 0, h = 0; //default image size
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Surface surface;
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ImageLoader(FileType type) : LoadModule(type) {}
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virtual bool animatable() { return false; } //true if this loader supports animation.
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virtual Paint* paint() { return nullptr; }
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virtual Surface* bitmap()
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{
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if (surface.data) return &surface;
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return nullptr;
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}
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};
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struct FontLoader : LoadModule
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{
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float scale = 1.0f;
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FontLoader(FileType type) : LoadModule(type) {}
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virtual bool request(Shape* shape, char* text, bool italic = false) = 0;
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};
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#endif //_TVG_LOAD_MODULE_H_
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