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Diffstat (limited to 'include/effects/SkAlphaThresholdFilter.h')
-rw-r--r-- | include/effects/SkAlphaThresholdFilter.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/effects/SkAlphaThresholdFilter.h b/include/effects/SkAlphaThresholdFilter.h new file mode 100644 index 0000000000..23af56fc54 --- /dev/null +++ b/include/effects/SkAlphaThresholdFilter.h @@ -0,0 +1,26 @@ +/* + * Copyright 2013 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef SkAlphaThresholdFilter_DEFINED +#define SkAlphaThresholdFilter_DEFINED + +#include "SkRegion.h" +#include "SkImageFilter.h" + +class SK_API SkAlphaThresholdFilter { +public: + /** + * Creates an image filter that samples a region. If the sample is inside the + * region the alpha of the image is boosted up to a threshold value. If it is + * outside the region then the alpha is decreased to the threshold value. + * The 0,0 point of the region corresponds to the upper left corner of the + * source image. + */ + static SkImageFilter* Create(const SkRegion& region, SkScalar innerThreshold, SkScalar outerThreshold); +}; + +#endif |