| /* |
| * Copyright 2009 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #ifndef SkQuadClipper_DEFINED |
| #define SkQuadClipper_DEFINED |
| |
| #include "SkPath.h" |
| |
| /** This class is initialized with a clip rectangle, and then can be fed quads, |
| which must already be monotonic in Y. |
| |
| In the future, it might return a series of segments, allowing it to clip |
| also in X, to ensure that all segments fit in a finite coordinate system. |
| */ |
| class SkQuadClipper { |
| public: |
| SkQuadClipper(); |
| |
| void setClip(const SkIRect& clip); |
| |
| bool clipQuad(const SkPoint src[3], SkPoint dst[3]); |
| |
| private: |
| SkRect fClip; |
| }; |
| |
| /** Iterator that returns the clipped segements of a quad clipped to a rect. |
| The segments will be either lines or quads (based on SkPath::Verb), and |
| will all be monotonic in Y |
| */ |
| class SkQuadClipper2 { |
| public: |
| bool clipQuad(const SkPoint pts[3], const SkRect& clip); |
| bool clipCubic(const SkPoint pts[4], const SkRect& clip); |
| |
| SkPath::Verb next(SkPoint pts[]); |
| |
| private: |
| SkPoint* fCurrPoint; |
| SkPath::Verb* fCurrVerb; |
| |
| enum { |
| kMaxVerbs = 13, |
| kMaxPoints = 32 |
| }; |
| SkPoint fPoints[kMaxPoints]; |
| SkPath::Verb fVerbs[kMaxVerbs]; |
| |
| void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); |
| void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); |
| void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); |
| void appendQuad(const SkPoint pts[3], bool reverse); |
| void appendCubic(const SkPoint pts[4], bool reverse); |
| }; |
| |
| #ifdef SK_DEBUG |
| void sk_assert_monotonic_x(const SkPoint pts[], int count); |
| void sk_assert_monotonic_y(const SkPoint pts[], int count); |
| #else |
| #define sk_assert_monotonic_x(pts, count) |
| #define sk_assert_monotonic_y(pts, count) |
| #endif |
| |
| #endif |