1826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 2826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev/* 3826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev * Copyright 2006 The Android Open Source Project 4826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev * 5826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev * Use of this source code is governed by a BSD-style license that can be 6826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev * found in the LICENSE file. 7826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev */ 8826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 9826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 10826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev#ifndef SkPerspIter_DEFINED 11826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev#define SkPerspIter_DEFINED 12826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 13826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev#include "SkMatrix.h" 14826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 15826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchevclass SkPerspIter { 16826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchevpublic: 17826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev /** Iterate a line through the matrix [x,y] ... [x+count-1, y]. 18826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev @param m The matrix we will be iterating a line through 19826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev @param x The initial X coordinate to be mapped through the matrix 20826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev @param y The initial Y coordinate to be mapped through the matrix 21826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev @param count The number of points (x,y) (x+1,y) (x+2,y) ... we will eventually map 22826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev */ 23826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev SkPerspIter(const SkMatrix& m, SkScalar x, SkScalar y, int count); 24826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 25826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev /** Return the buffer of [x,y] fixed point values we will be filling. 26826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev This always returns the same value, so it can be saved across calls to 27826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev next(). 28826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev */ 29826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev const SkFixed* getXY() const { return fStorage; } 30826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 31826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev /** Return the number of [x,y] pairs that have been filled in the getXY() buffer. 32826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev When this returns 0, the iterator is finished. 33826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev */ 34826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev int next(); 35826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 36826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchevprivate: 37826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev enum { 38826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev kShift = 4, 39826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev kCount = (1 << kShift) 40826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev }; 41826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev const SkMatrix& fMatrix; 42826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev SkFixed fStorage[kCount * 2]; 43826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev SkFixed fX, fY; 44826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev SkScalar fSX, fSY; 45826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev int fCount; 46826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev}; 47826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev 48826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev#endif 49826ececcbea342f7a0b92ec61847f1c95d384e05Iliyan Malchev