mirror of https://github.com/axmolengine/axmol.git
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* libs/graphics/sgl/SkEdge.h
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef SkEdge_DEFINED
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#define SkEdge_DEFINED
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#include "SkRect.h"
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struct SkEdge {
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enum Type {
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kLine_Type,
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kQuad_Type,
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kCubic_Type
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};
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SkEdge* fNext;
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SkEdge* fPrev;
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SkFixed fX;
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SkFixed fDX;
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int32_t fFirstY;
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int32_t fLastY;
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int8_t fCurveCount; // only used by kQuad(+) and kCubic(-)
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uint8_t fCurveShift; // appled to all Dx/DDx/DDDx except for fCubicDShift exception
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uint8_t fCubicDShift; // applied to fCDx and fCDy only in cubic
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int8_t fWinding; // 1 or -1
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int setLine(const SkPoint& p0, const SkPoint& p1, const SkIRect* clip,
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int shiftUp);
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inline int updateLine(SkFixed ax, SkFixed ay, SkFixed bx, SkFixed by);
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void chopLineWithClip(const SkIRect& clip);
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inline bool intersectsClip(const SkIRect& clip) const {
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SkASSERT(fFirstY < clip.fBottom);
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return fLastY >= clip.fTop;
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}
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#ifdef SK_DEBUG
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void dump() const {
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#ifdef SK_CAN_USE_FLOAT
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SkDebugf("edge: firstY:%d lastY:%d x:%g dx:%g w:%d\n", fFirstY, fLastY, SkFixedToFloat(fX), SkFixedToFloat(fDX), fWinding);
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#else
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SkDebugf("edge: firstY:%d lastY:%d x:%x dx:%x w:%d\n", fFirstY, fLastY, fX, fDX, fWinding);
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#endif
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}
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void validate() const {
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SkASSERT(fPrev && fNext);
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SkASSERT(fPrev->fNext == this);
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SkASSERT(fNext->fPrev == this);
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SkASSERT(fFirstY <= fLastY);
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SkASSERT(SkAbs32(fWinding) == 1);
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}
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#endif
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};
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struct SkQuadraticEdge : public SkEdge {
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SkFixed fQx, fQy;
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SkFixed fQDx, fQDy;
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SkFixed fQDDx, fQDDy;
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SkFixed fQLastX, fQLastY;
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int setQuadratic(const SkPoint pts[3], int shiftUp);
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int updateQuadratic();
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};
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struct SkCubicEdge : public SkEdge {
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SkFixed fCx, fCy;
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SkFixed fCDx, fCDy;
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SkFixed fCDDx, fCDDy;
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SkFixed fCDDDx, fCDDDy;
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SkFixed fCLastX, fCLastY;
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int setCubic(const SkPoint pts[4], const SkIRect* clip, int shiftUp);
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int updateCubic();
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};
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#endif
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