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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 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 #include "SkDeviceLooper.h" |
| 9 |
| 10 SkDeviceLooper::SkDeviceLooper(const SkBitmap& base, |
| 11 const SkRasterClip& rc, |
| 12 const SkIRect& bounds, bool aa) |
| 13 : fBaseBitmap(base) |
| 14 , fBaseRC(rc) |
| 15 , fDelta(aa ? kAA_Delta : kBW_Delta) |
| 16 { |
| 17 SkIRect bitmapBounds = SkIRect::MakeWH(base.width(), base.height()); |
| 18 if (!fClippedBounds.intersect(bounds, bitmapBounds)) { |
| 19 fState = kDone_State; |
| 20 } else if (this->fitsInDelta(bounds)) { |
| 21 fCurrBitmap = &fBaseBitmap; |
| 22 fCurrRC = &fBaseRC; |
| 23 fState = kSimple_State; |
| 24 } else { |
| 25 fCurrBitmap = &fSubsetBitmap; |
| 26 fCurrRC = &fSubsetRC; |
| 27 // back up by 1 DX, so that next() will put us in a correct starting |
| 28 // position. |
| 29 fCurrOffset.set(fClippedBounds.left() - fDelta, |
| 30 fClippedBounds.top()); |
| 31 fState = kComplex_State; |
| 32 } |
| 33 } |
| 34 |
| 35 SkDeviceLooper::~SkDeviceLooper() { |
| 36 } |
| 37 |
| 38 void SkDeviceLooper::mapRect(SkRect* dst, const SkRect& src) const { |
| 39 SkASSERT(kDone_State != fState); |
| 40 *dst = src; |
| 41 dst->offset(SkIntToScalar(-fCurrOffset.fX), |
| 42 SkIntToScalar(-fCurrOffset.fY)); |
| 43 } |
| 44 |
| 45 void SkDeviceLooper::mapMatrix(SkMatrix* dst, const SkMatrix& src) const { |
| 46 SkASSERT(kDone_State != fState); |
| 47 *dst = src; |
| 48 dst->postTranslate(SkIntToScalar(-fCurrOffset.fX), |
| 49 SkIntToScalar(-fCurrOffset.fY)); |
| 50 } |
| 51 |
| 52 bool SkDeviceLooper::computeCurrBitmapAndClip() { |
| 53 SkASSERT(kComplex_State == fState); |
| 54 |
| 55 SkIRect r = SkIRect::MakeXYWH(fCurrOffset.x(), fCurrOffset.y(), |
| 56 fDelta, fDelta); |
| 57 if (!fBaseBitmap.extractSubset(&fSubsetBitmap, r)) { |
| 58 fState = kDone_State; |
| 59 return false; |
| 60 } |
| 61 fSubsetBitmap.lockPixels(); |
| 62 |
| 63 fBaseRC.translate(-r.left(), -r.top(), &fSubsetRC); |
| 64 (void)fSubsetRC.op(SkIRect::MakeWH(fDelta, fDelta), SkRegion::kIntersect_Op)
; |
| 65 return true; |
| 66 } |
| 67 |
| 68 bool SkDeviceLooper::next() { |
| 69 if (kDone_State == fState) { |
| 70 return false; |
| 71 } |
| 72 |
| 73 if (kSimple_State == fState) { |
| 74 fCurrBitmap = &fBaseBitmap; |
| 75 fCurrRC = &fBaseRC; |
| 76 fCurrOffset.set(0, 0); |
| 77 fState = kDone_State; |
| 78 return true; |
| 79 } |
| 80 |
| 81 SkASSERT(kComplex_State == fState); |
| 82 |
| 83 // need to propogate fCurrOffset through clippedbounds |
| 84 // left to right, until we wrap around and move down |
| 85 |
| 86 if (fCurrOffset.x() + fDelta < fClippedBounds.right()) { |
| 87 fCurrOffset.fX += fDelta; |
| 88 return this->computeCurrBitmapAndClip(); |
| 89 } |
| 90 fCurrOffset.fX = fClippedBounds.left(); |
| 91 if (fCurrOffset.y() + fDelta < fClippedBounds.bottom()) { |
| 92 fCurrOffset.fY += fDelta; |
| 93 return this->computeCurrBitmapAndClip(); |
| 94 } |
| 95 fState = kDone_State; |
| 96 return false; |
| 97 } |
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