1f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 2f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger/* 3f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger * Copyright 2006 The Android Open Source Project 4f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger * 5f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger * Use of this source code is governed by a BSD-style license that can be 6f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger * found in the LICENSE file. 7f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger */ 8f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 9f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 10f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger#ifndef SkPerspIter_DEFINED 11f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger#define SkPerspIter_DEFINED 12f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 13f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger#include "SkMatrix.h" 14f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 15f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenbergerclass SkPerspIter { 16f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenbergerpublic: 17f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger /** Iterate a line through the matrix [x,y] ... [x+count-1, y]. 18f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger @param m The matrix we will be iterating a line through 19f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger @param x The initial X coordinate to be mapped through the matrix 20f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger @param y The initial Y coordinate to be mapped through the matrix 21f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger @param count The number of points (x,y) (x+1,y) (x+2,y) ... we will eventually map 22f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger */ 23f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger SkPerspIter(const SkMatrix& m, SkScalar x, SkScalar y, int count); 24f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 25f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger /** Return the buffer of [x,y] fixed point values we will be filling. 26f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger This always returns the same value, so it can be saved across calls to 27f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger next(). 28f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger */ 29f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger const SkFixed* getXY() const { return fStorage; } 30f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 31f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger /** Return the number of [x,y] pairs that have been filled in the getXY() buffer. 32f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger When this returns 0, the iterator is finished. 33f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger */ 34f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger int next(); 35f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 36f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenbergerprivate: 37f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger enum { 38f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger kShift = 4, 39f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger kCount = (1 << kShift) 40f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger }; 41f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger const SkMatrix& fMatrix; 42f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger SkFixed fStorage[kCount * 2]; 43f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger SkFixed fX, fY; 44f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger SkScalar fSX, fSY; 45f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger int fCount; 46f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger}; 47f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger 48f8cacf6b11e35785df8efb613b0c3592d535f603Derek Sollenberger#endif 49