1/* libs/graphics/sgl/SkScan.h 2** 3** Copyright 2006, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#ifndef SkScan_DEFINED 19#define SkScan_DEFINED 20 21#include "SkRect.h" 22 23class SkRegion; 24class SkBlitter; 25class SkPath; 26 27/** Defines a fixed-point rectangle, identical to the integer SkIRect, but its 28 coordinates are treated as SkFixed rather than int32_t. 29*/ 30typedef SkIRect SkXRect; 31 32class SkScan { 33public: 34 static void FillIRect(const SkIRect&, const SkRegion* clip, SkBlitter*); 35 static void FillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*); 36 37#ifdef SK_SCALAR_IS_FIXED 38 static void FillRect(const SkRect& rect, const SkRegion* clip, 39 SkBlitter* blitter) { 40 SkScan::FillXRect(*(const SkXRect*)&rect, clip, blitter); 41 } 42#else 43 static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*); 44#endif 45 46 static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*); 47 static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*); 48 49 static void FillTriangle(const SkPoint& a, const SkPoint& b, 50 const SkPoint& c, const SkRegion* clip, 51 SkBlitter* blitter) { 52 SkPoint pts[3]; 53 pts[0] = a; 54 pts[1] = b; 55 pts[2] = c; 56 FillTriangle(pts, clip, blitter); 57 } 58 59 static void HairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*); 60 static void HairRect(const SkRect&, const SkRegion* clip, SkBlitter*); 61 static void HairPath(const SkPath&, const SkRegion* clip, SkBlitter*); 62 63 static void FrameRect(const SkRect&, SkScalar width, const SkRegion* clip, SkBlitter*); 64 65 static void AntiFillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*); 66#ifdef SK_SCALAR_IS_FIXED 67 static void AntiFillRect(const SkRect& rect, const SkRegion* clip, 68 SkBlitter* blitter) { 69 SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter); 70 } 71#else 72 static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*); 73#endif 74 75 static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*); 76 77 static void AntiHairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*); 78 static void AntiHairRect(const SkRect&, const SkRegion* clip, SkBlitter*); 79 static void AntiHairPath(const SkPath&, const SkRegion* clip, SkBlitter*); 80}; 81 82/** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates 83 from int to SkFixed. Does not check for overflow if the src coordinates 84 exceed 32K 85*/ 86static inline void XRect_set(SkXRect* xr, const SkIRect& src) { 87 xr->fLeft = SkIntToFixed(src.fLeft); 88 xr->fTop = SkIntToFixed(src.fTop); 89 xr->fRight = SkIntToFixed(src.fRight); 90 xr->fBottom = SkIntToFixed(src.fBottom); 91} 92 93/** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates 94 from SkScalar to SkFixed. Does not check for overflow if the src coordinates 95 exceed 32K 96*/ 97static inline void XRect_set(SkXRect* xr, const SkRect& src) { 98 xr->fLeft = SkScalarToFixed(src.fLeft); 99 xr->fTop = SkScalarToFixed(src.fTop); 100 xr->fRight = SkScalarToFixed(src.fRight); 101 xr->fBottom = SkScalarToFixed(src.fBottom); 102} 103 104/** Round the SkXRect coordinates, and store the result in the SkIRect. 105*/ 106static inline void XRect_round(const SkXRect& xr, SkIRect* dst) { 107 dst->fLeft = SkFixedRound(xr.fLeft); 108 dst->fTop = SkFixedRound(xr.fTop); 109 dst->fRight = SkFixedRound(xr.fRight); 110 dst->fBottom = SkFixedRound(xr.fBottom); 111} 112 113/** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling 114 for right/bottom), and store the result in the SkIRect. 115*/ 116static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) { 117 dst->fLeft = SkFixedFloor(xr.fLeft); 118 dst->fTop = SkFixedFloor(xr.fTop); 119 dst->fRight = SkFixedCeil(xr.fRight); 120 dst->fBottom = SkFixedCeil(xr.fBottom); 121} 122 123#endif 124