1/* 2 * Copyright 2011 The Android Open Source Project 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 9#ifndef SkScan_DEFINED 10#define SkScan_DEFINED 11 12#include "include/core/SkRect.h" 13#include "include/private/SkFixed.h" 14#include <atomic> 15 16class SkRasterClip; 17class SkRegion; 18class SkBlitter; 19class SkPath; 20 21/** Defines a fixed-point rectangle, identical to the integer SkIRect, but its 22 coordinates are treated as SkFixed rather than int32_t. 23*/ 24typedef SkIRect SkXRect; 25 26extern std::atomic<bool> gSkUseAnalyticAA; 27extern std::atomic<bool> gSkForceAnalyticAA; 28 29class AdditiveBlitter; 30 31class SkScan { 32public: 33 /* 34 * Draws count-1 line segments, one at a time: 35 * line(pts[0], pts[1]) 36 * line(pts[1], pts[2]) 37 * line(......, pts[count - 1]) 38 */ 39 typedef void (*HairRgnProc)(const SkPoint[], int count, const SkRegion*, SkBlitter*); 40 typedef void (*HairRCProc)(const SkPoint[], int count, const SkRasterClip&, SkBlitter*); 41 42 static void FillPath(const SkPath&, const SkIRect&, SkBlitter*); 43 44 // Paths of a certain size cannot be anti-aliased unless externally tiled (handled by SkDraw). 45 // AA clipping doesn't do that, so it's better for the clip stack to adjust AA state early 46 // rather than clip to the internal limits of the blitter. 47 static bool DowngradeClipAA(const SkIRect& bounds); 48 49 /////////////////////////////////////////////////////////////////////////// 50 // rasterclip 51 52 static void FillIRect(const SkIRect&, const SkRasterClip&, SkBlitter*); 53 static void FillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*); 54 static void FillRect(const SkRect&, const SkRasterClip&, SkBlitter*); 55 static void AntiFillRect(const SkRect&, const SkRasterClip&, SkBlitter*); 56 static void AntiFillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*); 57 static void FillPath(const SkPath&, const SkRasterClip&, SkBlitter*); 58 static void AntiFillPath(const SkPath&, const SkRasterClip&, SkBlitter*); 59 static void FrameRect(const SkRect&, const SkPoint& strokeSize, 60 const SkRasterClip&, SkBlitter*); 61 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize, 62 const SkRasterClip&, SkBlitter*); 63 static void FillTriangle(const SkPoint pts[], const SkRasterClip&, SkBlitter*); 64 static void HairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*); 65 static void AntiHairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*); 66 static void HairRect(const SkRect&, const SkRasterClip&, SkBlitter*); 67 static void AntiHairRect(const SkRect&, const SkRasterClip&, SkBlitter*); 68 static void HairPath(const SkPath&, const SkRasterClip&, SkBlitter*); 69 static void AntiHairPath(const SkPath&, const SkRasterClip&, SkBlitter*); 70 static void HairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*); 71 static void AntiHairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*); 72 static void HairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*); 73 static void AntiHairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*); 74 75 // Needed by do_fill_path in SkScanPriv.h 76 static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*); 77 78private: 79 friend class SkAAClip; 80 friend class SkRegion; 81 82 static void FillIRect(const SkIRect&, const SkRegion* clip, SkBlitter*); 83 static void FillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*); 84 static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*); 85 static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*); 86 static void AntiFillXRect(const SkXRect&, const SkRegion*, SkBlitter*); 87 static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*, bool forceRLE); 88 static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*); 89 90 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize, 91 const SkRegion*, SkBlitter*); 92 static void HairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*); 93 static void AntiHairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*); 94 static void AAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR, 95 const SkIRect& clipBounds, bool forceRLE); 96 static void SAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR, 97 const SkIRect& clipBounds, bool forceRLE); 98}; 99 100/** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates 101 from int to SkFixed. Does not check for overflow if the src coordinates 102 exceed 32K 103*/ 104static inline void XRect_set(SkXRect* xr, const SkIRect& src) { 105 xr->fLeft = SkIntToFixed(src.fLeft); 106 xr->fTop = SkIntToFixed(src.fTop); 107 xr->fRight = SkIntToFixed(src.fRight); 108 xr->fBottom = SkIntToFixed(src.fBottom); 109} 110 111/** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates 112 from SkScalar to SkFixed. Does not check for overflow if the src coordinates 113 exceed 32K 114*/ 115static inline void XRect_set(SkXRect* xr, const SkRect& src) { 116 xr->fLeft = SkScalarToFixed(src.fLeft); 117 xr->fTop = SkScalarToFixed(src.fTop); 118 xr->fRight = SkScalarToFixed(src.fRight); 119 xr->fBottom = SkScalarToFixed(src.fBottom); 120} 121 122/** Round the SkXRect coordinates, and store the result in the SkIRect. 123*/ 124static inline void XRect_round(const SkXRect& xr, SkIRect* dst) { 125 dst->fLeft = SkFixedRoundToInt(xr.fLeft); 126 dst->fTop = SkFixedRoundToInt(xr.fTop); 127 dst->fRight = SkFixedRoundToInt(xr.fRight); 128 dst->fBottom = SkFixedRoundToInt(xr.fBottom); 129} 130 131/** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling 132 for right/bottom), and store the result in the SkIRect. 133*/ 134static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) { 135 dst->fLeft = SkFixedFloorToInt(xr.fLeft); 136 dst->fTop = SkFixedFloorToInt(xr.fTop); 137 dst->fRight = SkFixedCeilToInt(xr.fRight); 138 dst->fBottom = SkFixedCeilToInt(xr.fBottom); 139} 140 141#endif 142