1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkQuadClipper.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,70 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2009 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkQuadClipper_DEFINED
1.14 +#define SkQuadClipper_DEFINED
1.15 +
1.16 +#include "SkPath.h"
1.17 +
1.18 +/** This class is initialized with a clip rectangle, and then can be fed quads,
1.19 + which must already be monotonic in Y.
1.20 +
1.21 + In the future, it might return a series of segments, allowing it to clip
1.22 + also in X, to ensure that all segments fit in a finite coordinate system.
1.23 + */
1.24 +class SkQuadClipper {
1.25 +public:
1.26 + SkQuadClipper();
1.27 +
1.28 + void setClip(const SkIRect& clip);
1.29 +
1.30 + bool clipQuad(const SkPoint src[3], SkPoint dst[3]);
1.31 +
1.32 +private:
1.33 + SkRect fClip;
1.34 +};
1.35 +
1.36 +/** Iterator that returns the clipped segements of a quad clipped to a rect.
1.37 + The segments will be either lines or quads (based on SkPath::Verb), and
1.38 + will all be monotonic in Y
1.39 + */
1.40 +class SkQuadClipper2 {
1.41 +public:
1.42 + bool clipQuad(const SkPoint pts[3], const SkRect& clip);
1.43 + bool clipCubic(const SkPoint pts[4], const SkRect& clip);
1.44 +
1.45 + SkPath::Verb next(SkPoint pts[]);
1.46 +
1.47 +private:
1.48 + SkPoint* fCurrPoint;
1.49 + SkPath::Verb* fCurrVerb;
1.50 +
1.51 + enum {
1.52 + kMaxVerbs = 13,
1.53 + kMaxPoints = 32
1.54 + };
1.55 + SkPoint fPoints[kMaxPoints];
1.56 + SkPath::Verb fVerbs[kMaxVerbs];
1.57 +
1.58 + void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
1.59 + void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
1.60 + void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
1.61 + void appendQuad(const SkPoint pts[3], bool reverse);
1.62 + void appendCubic(const SkPoint pts[4], bool reverse);
1.63 +};
1.64 +
1.65 +#ifdef SK_DEBUG
1.66 + void sk_assert_monotonic_x(const SkPoint pts[], int count);
1.67 + void sk_assert_monotonic_y(const SkPoint pts[], int count);
1.68 +#else
1.69 + #define sk_assert_monotonic_x(pts, count)
1.70 + #define sk_assert_monotonic_y(pts, count)
1.71 +#endif
1.72 +
1.73 +#endif
