From c53b7e5d38c24bce7ba55abf3060ffd012783086 Mon Sep 17 00:00:00 2001
From: Mattes D <github@xoft.cz>
Date: Mon, 27 Oct 2014 23:58:09 +0100
Subject: QtBiomeVisualiser: Switched caching to entire regions.

This speeds up the rendering preparation for small zooms.
---
 Tools/QtBiomeVisualiser/RegionCache.h | 73 +++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Tools/QtBiomeVisualiser/RegionCache.h

(limited to 'Tools/QtBiomeVisualiser/RegionCache.h')

diff --git a/Tools/QtBiomeVisualiser/RegionCache.h b/Tools/QtBiomeVisualiser/RegionCache.h
new file mode 100644
index 000000000..c343e4ba9
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/RegionCache.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <QObject>
+#include <QCache>
+#include <QMutex>
+#include <memory>
+
+
+
+
+
+// fwd:
+class Region;
+typedef std::shared_ptr<Region> RegionPtr;
+
+class ChunkSource;
+
+
+
+
+
+/** Caches regions' chunk data for reuse */
+class RegionCache :
+	public QObject
+{
+	typedef QObject super;
+	Q_OBJECT
+
+public:
+	explicit RegionCache(QObject * parent = NULL);
+
+	/** Retrieves the specified region from the cache.
+	Only returns valid regions; if the region is invalid, queues it for rendering and returns an empty ptr. */
+	RegionPtr fetch(int a_RegionX, int a_RegionZ);
+
+	/** Replaces the chunk source used by the biome view to get the chunk biome data.
+	The cache is then invalidated. */
+	void setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource);
+
+	/** Returns true iff the chunk source has been initialized. */
+	bool hasData() const { return (m_ChunkSource.get() != nullptr); }
+
+	/** Reloads the current chunk source. */
+	void reload();
+
+signals:
+	void regionAvailable(int a_RegionX, int a_RegionZ);
+
+protected slots:
+	void gotRegion(int a_RegionX, int a_RegionZ);
+
+protected:
+	/** The cache of the chunks */
+	QCache<quint32, RegionPtr> m_Cache;
+
+	/** Locks the cache against multithreaded access */
+	QMutex m_Mtx;
+
+	/** The source used to get the biome data. */
+	std::shared_ptr<ChunkSource> m_ChunkSource;
+
+
+	/** Returns the hash used by the chunk in the cache */
+	quint32 getRegionHash(int a_RegionX, int a_RegionZ);
+
+	/** Queues the specified region for rendering by m_RegionSource. */
+	void queueRegionRender(int a_RegionX, int a_RegionZ, RegionPtr & a_Region);
+};
+
+
+
+
+
-- 
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