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Diffstat (limited to 'gfx/skia/skia/include/effects/SkTrimPathEffect.h')
-rw-r--r-- | gfx/skia/skia/include/effects/SkTrimPathEffect.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/effects/SkTrimPathEffect.h b/gfx/skia/skia/include/effects/SkTrimPathEffect.h new file mode 100644 index 0000000000..3e6fb7c342 --- /dev/null +++ b/gfx/skia/skia/include/effects/SkTrimPathEffect.h @@ -0,0 +1,45 @@ +/* + * Copyright 2018 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef SkTrimPathEffect_DEFINED +#define SkTrimPathEffect_DEFINED + +#include "include/core/SkRefCnt.h" +#include "include/core/SkScalar.h" +#include "include/core/SkTypes.h" + +class SkPathEffect; + +class SK_API SkTrimPathEffect { +public: + enum class Mode { + kNormal, // return the subset path [start,stop] + kInverted, // return the complement/subset paths [0,start] + [stop,1] + }; + + /** + * Take start and stop "t" values (values between 0...1), and return a path that is that + * subset of the original path. + * + * e.g. + * Make(0.5, 1.0) --> return the 2nd half of the path + * Make(0.33333, 0.66667) --> return the middle third of the path + * + * The trim values apply to the entire path, so if it contains several contours, all of them + * are including in the calculation. + * + * startT and stopT must be 0..1 inclusive. If they are outside of that interval, they will + * be pinned to the nearest legal value. If either is NaN, null will be returned. + * + * Note: for Mode::kNormal, this will return one (logical) segment (even if it is spread + * across multiple contours). For Mode::kInverted, this will return 2 logical + * segments: stopT..1 and 0...startT, in this order. + */ + static sk_sp<SkPathEffect> Make(SkScalar startT, SkScalar stopT, Mode = Mode::kNormal); +}; + +#endif |