Started to implement svg cache

qgis · Jun 21, 2011 · 651259a · 651259a
1 parent a21e1db
commit 651259a
Show file tree

Hide file tree

Showing 3 changed files with 133 additions and 0 deletions.
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
@@ -37,6 +37,7 @@ SET(QGIS_CORE_SRCS
   symbology-ng/qgsvectorcolorrampv2.cpp
   symbology-ng/qgsstylev2.cpp
   symbology-ng/qgssymbologyv2conversion.cpp
+  symbology-ng/qgssvgcache.cpp
 
   qgis.cpp
   qgsapplication.cpp

diff --git a/src/core/symbology-ng/qgssvgcache.cpp b/src/core/symbology-ng/qgssvgcache.cpp
@@ -0,0 +1,59 @@
+/***************************************************************************
+                              qgssvgcache.h
+                            ------------------------------
+  begin                :  2011
+  copyright            : (C) 2011 by Marco Hugentobler
+  email                : marco dot hugentobler at sourcepole dot ch
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgssvgcache.h"
+
+QgsSvgCache* QgsSvgCache::mInstance = 0;
+
+QgsSvgCache* QgsSvgCache::instance()
+{
+  if ( !mInstance )
+  {
+    mInstance = new QgsSvgCache();
+  }
+  return mInstance;
+}
+
+QgsSvgCache::QgsSvgCache()
+{
+}
+
+QgsSvgCache::~QgsSvgCache()
+{
+}
+
+
+const QImage& QgsSvgCache::svgAsImage( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth ) const
+{
+}
+
+const QPicture& QgsSvgCache::svgAsPicture( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth ) const
+{
+}
+
+void QgsSvgCache::insertSVG( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth )
+{
+}
+
+void QgsSvgCache::cacheImage( QgsSvgCacheEntry )
+{
+}
+
+void QgsSvgCache::cachePicture( QgsSvgCacheEntry )
+{
+}
+
diff --git a/src/core/symbology-ng/qgssvgcache.h b/src/core/symbology-ng/qgssvgcache.h
@@ -0,0 +1,73 @@
+/***************************************************************************
+                              qgssvgcache.h
+                            ------------------------------
+  begin                :  2011
+  copyright            : (C) 2011 by Marco Hugentobler
+  email                : marco dot hugentobler at sourcepole dot ch
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSSVGCACHE_H
+#define QGSSVGCACHE_H
+
+#include <QColor>
+#include <QDateTime>
+#include <QMap>
+#include <QMultiHash>
+#include <QString>
+
+class QImage;
+class QPicture;
+
+struct QgsSvgCacheEntry
+{
+  QString file;
+  double size;
+  double outlineWidth;
+  QColor fill;
+  QColor outline;
+  QImage* image;
+  QPicture* picture;
+  QDateTime lastUsed;
+};
+
+/**A cache for images / pictures derived from svg files. This class supports parameter replacement in svg files
+according to the svg params specification (http://www.w3.org/TR/2009/WD-SVGParamPrimer-20090616/). Supported are
+the parameters 'fill-color', 'pen-color', 'outline-width', 'stroke-width'. E.g. <circle fill="param(fill-color red)" stroke="param(pen-color black)" stroke-width="param(outline-width 1)"*/
+class QgsSvgCache
+{
+  public:
+
+    static QgsSvgCache* instance();
+    ~QgsSvgCache();
+
+    const QImage& svgAsImage( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth ) const;
+    const QPicture& svgAsPicture( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth ) const;
+
+  protected:
+    QgsSvgCache();
+
+    void insertSVG( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth );
+    void cacheImage( QgsSvgCacheEntry );
+    void cachePicture( QgsSvgCacheEntry );
+
+  private:
+    static QgsSvgCache* mInstance;
+
+    /**Entries sorted by last used time*/
+    QMap< QDateTime, QgsSvgCacheEntry > mEntries;
+    /**Entry pointers accessible by file name*/
+    QMultiHash< QString, QgsSvgCacheEntry* > mEntryLookup;
+    /**Estimated total size of all images and pictures*/
+    double mTotalSize;
+};
+
+#endif // QGSSVGCACHE_H