// Return true if the cache is generated.
//
// We may return false and not generate the cache if
// 1. The picture is not worth rasterizing
// 2. The matrix is singular
// 3. The picture is accessed too few times
public bool Prepare(GRContext context, SKPicture picture, SKMatrix transformation_matrix, SKColorSpace dst_color_space, bool is_complex, bool will_change)
{
if (!GlobalMembers.IsPictureWorthRasterizing(picture, will_change, is_complex))
{
// We only deal with pictures that are worthy of rasterization.
return(false);
}
// Decompose the matrix (once) for all subsequent operations. We want to make
// sure to avoid volumetric distortions while accounting for scaling.
//MatrixDecomposition matrix = new MatrixDecomposition(transformation_matrix);
//if (!matrix.IsValid())
//{
// // The matrix was singular. No point in going further.
// return false;
//}
RasterCacheKey <UniqueEntry> cache_key = new RasterCacheKey <UniqueEntry>(new UniqueEntry(picture.UniqueId), transformation_matrix);
Entry entry = picture_cache_.First(x => x.Equals(cache_key)).id(); // I used Linq, that aint going to be good for performance
//C++ TO C# CONVERTER TODO TASK: The following line was determined to be a copy assignment (rather than a reference assignment) - this should be verified and a 'CopyFrom' method should be created:
//ORIGINAL LINE: entry.access_count = ClampSize(entry.access_count + 1, 0, threshold_);
entry.access_count = GlobalMembers.ClampSize(entry.access_count + 1, 0, threshold_);
entry.used_this_frame = true;
if (entry.access_count < threshold_ || threshold_ == 0)
{
// Frame threshold has not yet been reached.
return(false);
}
if (!entry.image.is_valid)
{
//C++ TO C# CONVERTER TODO TASK: The following line was determined to be a copy assignment (rather than a reference assignment) - this should be verified and a 'CopyFrom' method should be created:
//ORIGINAL LINE: entry.image = RasterizePicture(picture, context, transformation_matrix, dst_color_space, checkerboard_images_);
entry.image = GlobalMembers.RasterizePicture(picture, context, transformation_matrix, dst_color_space, checkerboard_images_);
}
return(true);
}