mirror of
https://github.com/amyinspace/MagicSetEditor2.git
synced 2026-06-10 04:57:00 -04:00
coppro
26562e03e3
git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@837 0fc631ac-6414-0410-93d0-97cfa31319b6
85 lines
3.4 KiB
C++
85 lines
3.4 KiB
C++
//+----------------------------------------------------------------------------+
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//| Description: Magic Set Editor - Program to make Magic (tm) cards |
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//| Copyright: (C) 2001 - 2008 Twan van Laarhoven and "coppro" |
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//| License: GNU General Public License 2 or later (see file COPYING) |
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//+----------------------------------------------------------------------------+
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#ifndef HEADER_GUI_THUMBNAIL_THREAD
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#define HEADER_GUI_THUMBNAIL_THREAD
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// ----------------------------------------------------------------------------- : Includes
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#include <util/prec.hpp>
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#include <wx/datetime.h>
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#include <wx/filename.h>
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#include <queue>
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DECLARE_POINTER_TYPE(ThumbnailRequest);
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class ThumbnailThreadWorker;
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// ----------------------------------------------------------------------------- : ThumbnailRequest
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/// A request for some kind of thumbnail
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class ThumbnailRequest : public IntrusivePtrVirtualBase {
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public:
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ThumbnailRequest(void* owner, const String& cache_name, const wxDateTime& modified)
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: owner(owner), cache_name(cache_name), modified(modified) {}
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virtual ~ThumbnailRequest() {}
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/// Generate the thumbnail, called in another thread
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virtual Image generate() = 0;
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/// Store the thumbnail, called from the main thread
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virtual void store(const Image&) = 0;
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/// Can the thumbnail safely be generated from another thread?
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virtual bool threadSafe() const { return true; }
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/// Object that requested the thumbnail
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void* const owner;
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/// Name under which this object will be stored in the image cache
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String cache_name;
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/// Modification time for the object of which the thumnail is generated
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wxDateTime modified;
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};
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// ----------------------------------------------------------------------------- : ThumbnailThread
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/// A (generic) class that generates thumbnails in another thread
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/** All requests have an 'owner', the object that requested the thumbnail.
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* This object should regularly call "done(this)".
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* Multiple requests can be open at the same time.
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* Thumbnails are cached, and need not be generated in a thread
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*/
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class ThumbnailThread {
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public:
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ThumbnailThread();
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/// Request a thumbnail, it may be store()d immediatly if the thumbnail is cached
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void request(const ThumbnailRequestP& request);
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/// Is one or more thumbnail for the given owner finished?
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/** If so, call their store() functions */
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bool done(void* owner);
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/// Abort all thumbnail requests for the given owner
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void abort(void* owner);
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/// Abort all computations
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/** *must* be called at application exit */
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void abortAll();
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private:
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wxMutex mutex; ///< Mutex used by the worker when accessing the request lists or the thread pointer
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wxCondition completed; ///< Event signaled when a request is completed
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deque<ThumbnailRequestP> open_requests; ///< Requests on which work hasn't finished
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vector<pair<ThumbnailRequestP,Image> > closed_requests; ///< Requests for which work is completed
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set<ThumbnailRequestP> request_names; ///< Requests that haven't been stored yet, to prevent duplicates
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friend class ThumbnailThreadWorker;
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ThumbnailThreadWorker* worker; ///< The worker thread. invariant: no requests ==> worker==nullptr
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};
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/// The global thumbnail generator thread
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extern ThumbnailThread thumbnail_thread;
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// ----------------------------------------------------------------------------- : EOF
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#endif
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