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 23 class SkRegion; 24 class SkBlitter; 25 class 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 */ 30 typedef SkIRect SkXRect; 31 32 class SkScan { 33 public: 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 */ 86 static 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 */ 97 static 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 */ 106 static 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 */ 116 static 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