/// <summary>
/// Renders a given layer on a surface and caches it.
/// </summary>
/// <param name="setting">Display setting</param>
/// <param name="layer">Which layer is it we're rendering</param>
/// <param name="layerStyleDef">Style definition</param>
/// <param name="layerStyle">Style to render</param>
/// <param name="segments">Which segments to render</param>
/// <param name="skewAngle">How much to skew</param>
public void RasterizeLayer(DisplaySetting setting, RasterizeLayer layer, RasterizeLayerStyleDefinition layerStyleDef, RasterizeLayerStyle layerStyle, IEnumerable <int> segments, float skewAngle)
{
var source = _svgs[setting.SegmentType][setting.StyleDefinition.SegmentWeight];
//Logger.Info("Rasterizing {0} segments of layer {1} on display {2} segment size = {3}x{4}", setting.SegmentType, layer, setting.Display, setting.Dim.SvgWidth, setting.Dim.SvgHeight);
using (var paint = new SKPaint()) {
ApplyFilters(paint, layerStyleDef, layerStyle);
foreach (var i in segments)
{
var initialKey = new RasterCacheKey(InitialCache, layer, setting.SegmentType, setting.StyleDefinition.SegmentWeight, i);
var cacheKey = new RasterCacheKey(setting.Display, layer, setting.SegmentType, setting.StyleDefinition.SegmentWeight, i);
if (!_rasterCache.ContainsKey(initialKey))
{
_rasterCache[initialKey] = RasterizeSegment(source[i].Picture, setting.Dim, skewAngle, paint);
}
else
{
if (_rasterCache.ContainsKey(cacheKey))
{
_rasterCache[cacheKey]?.Dispose();
}
_rasterCache[cacheKey] = RasterizeSegment(source[i].Picture, setting.Dim, skewAngle, paint);
}
}
}
}
/// <summary>
/// Returns a surface of a segment that was previously generated.
/// </summary>
///
/// <remarks>
/// Note that in order to avoid multiple rasterization for each display
/// on startup, we initially use only one cache. Then, when displays
/// get individually resized, each display has its own cache.
/// </remarks>
/// <param name="display">Display number</param>
/// <param name="layer">Which layer</param>
/// <param name="type">Which segment type</param>
/// <param name="weight">SegmentWeight</param>
/// <param name="segment">Which segment</param>
/// <returns>Rasterized surface of null if rasterization is unavailable</returns>
public SKSurface GetRasterized(int display, RasterizeLayer layer, SegmentType type, SegmentWeight weight, int segment)
{
// do we have an individual cache for that display already?
var displayKey = new RasterCacheKey(display, layer, type, weight, segment);
if (_rasterCache.ContainsKey(displayKey))
{
return(_rasterCache[displayKey]);
}
// fallback on initial cache
var initialKey = new RasterCacheKey(InitialCache, layer, type, weight, segment);
if (_rasterCache.ContainsKey(initialKey))
{
return(_rasterCache[initialKey]);
}
return(null);
}
