gfx/skia/trunk/src/core/SkQuadClipper.h@6474c204b198 (annotated)
gfx/skia/trunk/src/core/SkQuadClipper.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | |
| michael@0 | 2 | /* |
| michael@0 | 3 | * Copyright 2009 The Android Open Source Project |
| michael@0 | 4 | * |
| michael@0 | 5 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 6 | * found in the LICENSE file. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | |
| michael@0 | 10 | #ifndef SkQuadClipper_DEFINED |
| michael@0 | 11 | #define SkQuadClipper_DEFINED |
| michael@0 | 12 | |
| michael@0 | 13 | #include "SkPath.h" |
| michael@0 | 14 | |
| michael@0 | 15 | /** This class is initialized with a clip rectangle, and then can be fed quads, |
| michael@0 | 16 | which must already be monotonic in Y. |
| michael@0 | 17 | |
| michael@0 | 18 | In the future, it might return a series of segments, allowing it to clip |
| michael@0 | 19 | also in X, to ensure that all segments fit in a finite coordinate system. |
| michael@0 | 20 | */ |
| michael@0 | 21 | class SkQuadClipper { |
| michael@0 | 22 | public: |
| michael@0 | 23 | SkQuadClipper(); |
| michael@0 | 24 | |
| michael@0 | 25 | void setClip(const SkIRect& clip); |
| michael@0 | 26 | |
| michael@0 | 27 | bool clipQuad(const SkPoint src[3], SkPoint dst[3]); |
| michael@0 | 28 | |
| michael@0 | 29 | private: |
| michael@0 | 30 | SkRect fClip; |
| michael@0 | 31 | }; |
| michael@0 | 32 | |
| michael@0 | 33 | /** Iterator that returns the clipped segements of a quad clipped to a rect. |
| michael@0 | 34 | The segments will be either lines or quads (based on SkPath::Verb), and |
| michael@0 | 35 | will all be monotonic in Y |
| michael@0 | 36 | */ |
| michael@0 | 37 | class SkQuadClipper2 { |
| michael@0 | 38 | public: |
| michael@0 | 39 | bool clipQuad(const SkPoint pts[3], const SkRect& clip); |
| michael@0 | 40 | bool clipCubic(const SkPoint pts[4], const SkRect& clip); |
| michael@0 | 41 | |
| michael@0 | 42 | SkPath::Verb next(SkPoint pts[]); |
| michael@0 | 43 | |
| michael@0 | 44 | private: |
| michael@0 | 45 | SkPoint* fCurrPoint; |
| michael@0 | 46 | SkPath::Verb* fCurrVerb; |
| michael@0 | 47 | |
| michael@0 | 48 | enum { |
| michael@0 | 49 | kMaxVerbs = 13, |
| michael@0 | 50 | kMaxPoints = 32 |
| michael@0 | 51 | }; |
| michael@0 | 52 | SkPoint fPoints[kMaxPoints]; |
| michael@0 | 53 | SkPath::Verb fVerbs[kMaxVerbs]; |
| michael@0 | 54 | |
| michael@0 | 55 | void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); |
| michael@0 | 56 | void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); |
| michael@0 | 57 | void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); |
| michael@0 | 58 | void appendQuad(const SkPoint pts[3], bool reverse); |
| michael@0 | 59 | void appendCubic(const SkPoint pts[4], bool reverse); |
| michael@0 | 60 | }; |
| michael@0 | 61 | |
| michael@0 | 62 | #ifdef SK_DEBUG |
| michael@0 | 63 | void sk_assert_monotonic_x(const SkPoint pts[], int count); |
| michael@0 | 64 | void sk_assert_monotonic_y(const SkPoint pts[], int count); |
| michael@0 | 65 | #else |
| michael@0 | 66 | #define sk_assert_monotonic_x(pts, count) |
| michael@0 | 67 | #define sk_assert_monotonic_y(pts, count) |
| michael@0 | 68 | #endif |
| michael@0 | 69 | |
| michael@0 | 70 | #endif |
