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* Clean up SkImageFilter constructors.Gravatar senorblanco2014-07-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | Now that all creation of SkImageFilters goes through factory Create() methods, there's no real reason for the convenience constructors. Some SkImageFilter subclasses which actually have zero DAG-able inputs were passing NULL to the superclass constructor. This actually means 1 input, with a NULL value, not zero inputs. This becomes more relevant for the upcoming cache infrastructure, where this indicates that the filter will use its src input, where in fact some of these filters do not (they are image generators only). Limiting SkImageFilter to a single constructor resolves this ambiguity. Along the way, I removed all of the default parameters to the constructors, since the Create methods always call them with the full argument list. BUG=skia: R=reed@google.com Author: senorblanco@chromium.org Review URL: https://codereview.chromium.org/376953003
* Add AlphaThreshold filter.Gravatar commit-bot@chromium.org2014-01-06
This is based on the Bitmap Alpha Threshold filter, and will be used by Chromium to implement the window shape API. R=bsalomon@chromium.org, wez@chromium.org, bsalomon@google.com, reed@google.com Author: zork@chromium.org Review URL: https://codereview.chromium.org/115633002 git-svn-id: http://skia.googlecode.com/svn/trunk@12935 2bbb7eff-a529-9590-31e7-b0007b416f81