QGIS/python/core/symbology-ng/qgssvgcache.sip

class QgsSvgCacheEntry
{
%TypeHeaderCode
#include <qgssvgcache.h>
%End

  public:
    QgsSvgCacheEntry();
    /** Constructor.
     * @param file Absolute path to SVG file (relative paths are not resolved).
     * @param size
     * @param outlineWidth width of outline
     * @param widthScaleFactor width scale factor
     * @param rasterScaleFactor raster scale factor
     * @param fill color of fill
     * @param outline color of outline
     * @param lookupKey the key string used in QgsSvgCache for quick lookup of this entry (relative or absolute path)
     */
    QgsSvgCacheEntry( const QString& file, double size, double outlineWidth, double widthScaleFactor, double rasterScaleFactor, const QColor& fill, const QColor& outline, const QString& lookupKey = QString() );
    ~QgsSvgCacheEntry();

    //! Absolute path to SVG file
    QString file;
    //! Lookup key used by QgsSvgCache's hashtable (relative or absolute path). Needed for removal from the hashtable
    QString lookupKey;
    double size; //size in pixels (cast to int for QImage)
    double outlineWidth;
    double widthScaleFactor;
    double rasterScaleFactor;

    /** SVG viewbox size.
     * @note added in QGIS 2.14
     */
    QSizeF viewboxSize;

    QColor fill;
    QColor outline;
    QImage* image;
    QPicture* picture;
    //content (with params replaced)
    QByteArray svgContent;

    //keep entries on a least, sorted by last access
    QgsSvgCacheEntry* nextEntry;
    QgsSvgCacheEntry* previousEntry;

    /** Don't consider image, picture, last used timestamp for comparison*/
    bool operator==( const QgsSvgCacheEntry& other ) const;
    /** Return memory usage in bytes*/
    int dataSize() const;

  private:

    QgsSvgCacheEntry( const QgsSvgCacheEntry& rh );
};

/** 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 : QObject
{
%TypeHeaderCode
#include <qgssvgcache.h>
%End

  public:

    static QgsSvgCache* instance();
    ~QgsSvgCache();

    /** Get SVG as QImage.
     * @param file Absolute or relative path to SVG file.
     * @param size size of cached image
     * @param fill color of fill
     * @param outline color of outline
     * @param outlineWidth width of outline
     * @param widthScaleFactor width scale factor
     * @param rasterScaleFactor raster scale factor
     * @param fitsInCache
     */
    const QImage& svgAsImage( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                              double widthScaleFactor, double rasterScaleFactor, bool& fitsInCache );
    /** Get SVG  as QPicture&.
     * @param file Absolute or relative path to SVG file.
     * @param size size of cached image
     * @param fill color of fill
     * @param outline color of outline
     * @param outlineWidth width of outline
     * @param widthScaleFactor width scale factor
     * @param rasterScaleFactor raster scale factor
     * @param forceVectorOutput
     */
    const QPicture& svgAsPicture( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                                  double widthScaleFactor, double rasterScaleFactor, bool forceVectorOutput = false );

    /** Calculates the viewbox size of a (possibly cached) SVG file.
     * @param file Absolute or relative path to SVG file.
     * @param size size of cached image
     * @param fill color of fill
     * @param outline color of outline
     * @param outlineWidth width of outline
     * @param widthScaleFactor width scale factor
     * @param rasterScaleFactor raster scale factor
     * @returns viewbox size set in SVG file
     * @note added in QGIS 2.14
     */
    QSizeF svgViewboxSize( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                           double widthScaleFactor, double rasterScaleFactor );

    /** Tests if an svg file contains parameters for fill, outline color, outline width. If yes, possible default values are returned. If there are several
      default values in the svg file, only the first one is considered*/
    void containsParams( const QString& path, bool& hasFillParam, QColor& defaultFillColor, bool& hasOutlineParam, QColor& defaultOutlineColor, bool& hasOutlineWidthParam,
                         double& defaultOutlineWidth ) const;

    /** Tests if an svg file contains parameters for fill, outline color, outline width. If yes, possible default values are returned. If there are several
     * default values in the svg file, only the first one is considered.
     * @param path path to SVG file
     * @param hasFillParam will be true if fill param present in SVG
     * @param hasDefaultFillParam will be true if fill param has a default value specified
     * @param defaultFillColor will be set to default fill color specified in SVG, if present
     * @param hasFillOpacityParam will be true if fill opacity param present in SVG
     * @param hasDefaultFillOpacity will be true if fill opacity param has a default value specified
     * @param defaultFillOpacity will be set to default fill opacity specified in SVG, if present
     * @param hasOutlineParam will be true if outline param present in SVG
     * @param hasDefaultOutlineColor will be true if outline param has a default value specified
     * @param defaultOutlineColor will be set to default outline color specified in SVG, if present
     * @param hasOutlineWidthParam will be true if outline width param present in SVG
     * @param hasDefaultOutlineWidth will be true if outline width param has a default value specified
     * @param defaultOutlineWidth will be set to default outline width specified in SVG, if present
     * @param hasOutlineOpacityParam will be true if outline opacity param present in SVG
     * @param hasDefaultOutlineOpacity will be true if outline opacity param has a default value specified
     * @param defaultOutlineOpacity will be set to default outline opacity specified in SVG, if present
     * @note available in python bindings as containsParamsV3
     * @note added in QGIS 2.14
     */
    void containsParams( const QString& path, bool& hasFillParam, bool& hasDefaultFillParam, QColor& defaultFillColor,
                         bool& hasFillOpacityParam, bool& hasDefaultFillOpacity, double& defaultFillOpacity,
                         bool& hasOutlineParam, bool& hasDefaultOutlineColor, QColor& defaultOutlineColor,
                         bool& hasOutlineWidthParam, bool& hasDefaultOutlineWidth, double& defaultOutlineWidth,
                         bool& hasOutlineOpacityParam, bool& hasDefaultOutlineOpacity, double& defaultOutlineOpacity ) const /PyName=containsParamsV3/;

    /** Get image data*/
    QByteArray getImageData( const QString &path ) const;

    /** Get SVG content*/
    const QByteArray& svgContent( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                                  double widthScaleFactor, double rasterScaleFactor );

  signals:
    /** Emit a signal to be caught by qgisapp and display a msg on status bar */
    void statusChanged( const QString&  theStatusQString );

  protected:
    //! protected constructor
    QgsSvgCache( QObject * parent /TransferThis/ = 0 );

    /** Creates new cache entry and returns pointer to it
     * @param file Absolute or relative path to SVG file. If the path is relative the file is searched by QgsSymbolLayerUtils::symbolNameToPath() in SVG paths.
     * in settings svg/searchPathsForSVG
     * @param size size of cached image
     * @param fill color of fill
     * @param outline color of outline
     * @param outlineWidth width of outline
     * @param widthScaleFactor width scale factor
     * @param rasterScaleFactor raster scale factor
     */
    QgsSvgCacheEntry* insertSVG( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                                 double widthScaleFactor, double rasterScaleFactor );

    void replaceParamsAndCacheSvg( QgsSvgCacheEntry* entry );
    void cacheImage( QgsSvgCacheEntry* entry );
    void cachePicture( QgsSvgCacheEntry* entry, bool forceVectorOutput = false );
    /** Returns entry from cache or creates a new entry if it does not exist already*/
    QgsSvgCacheEntry* cacheEntry( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
                                  double widthScaleFactor, double rasterScaleFactor );

    /** Removes the least used items until the maximum size is under the limit*/
    void trimToMaximumSize();

    //Removes entry from the ordered list (but does not delete the entry itself)
    void takeEntryFromList( QgsSvgCacheEntry* entry );

};