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comparison: gfx/skia/trunk/src/utils/SkCanvasStack.cpp
gfx/skia/trunk/src/utils/SkCanvasStack.cpp
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| -1:000000000000 | 0:9c578eaf70cc |
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| 1 | |
| 2 /* | |
| 3 * Copyright 2013 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #include "SkCanvasStack.h" | |
| 9 | |
| 10 SkCanvasStack::SkCanvasStack(int width, int height) | |
| 11 : INHERITED(width, height) {} | |
| 12 | |
| 13 SkCanvasStack::~SkCanvasStack() { | |
| 14 this->removeAll(); | |
| 15 } | |
| 16 | |
| 17 void SkCanvasStack::pushCanvas(SkCanvas* canvas, const SkIPoint& origin) { | |
| 18 if (canvas) { | |
| 19 // compute the bounds of this canvas | |
| 20 const SkIRect canvasBounds = SkIRect::MakeSize(canvas->getDeviceSize()); | |
| 21 | |
| 22 // push the canvas onto the stack | |
| 23 this->INHERITED::addCanvas(canvas); | |
| 24 | |
| 25 // push the canvas data onto the stack | |
| 26 CanvasData* data = &fCanvasData.push_back(); | |
| 27 data->origin = origin; | |
| 28 data->requiredClip.setRect(canvasBounds); | |
| 29 | |
| 30 // subtract this region from the canvas objects already on the stack. | |
| 31 // This ensures they do not draw into the space occupied by the layers | |
| 32 // above them. | |
| 33 for (int i = fList.count() - 1; i > 0; --i) { | |
| 34 SkIRect localBounds = canvasBounds; | |
| 35 localBounds.offset(origin - fCanvasData[i-1].origin); | |
| 36 | |
| 37 fCanvasData[i-1].requiredClip.op(localBounds, SkRegion::kDifference_Op); | |
| 38 fList[i-1]->clipRegion(fCanvasData[i-1].requiredClip); | |
| 39 } | |
| 40 } | |
| 41 SkASSERT(fList.count() == fCanvasData.count()); | |
| 42 } | |
| 43 | |
| 44 void SkCanvasStack::removeAll() { | |
| 45 fCanvasData.reset(); | |
| 46 this->INHERITED::removeAll(); | |
| 47 } | |
| 48 | |
| 49 /** | |
| 50 * Traverse all canvases (e.g. layers) the stack and ensure that they are clipped | |
| 51 * to their bounds and that the area covered by any canvas higher in the stack is | |
| 52 * also clipped out. | |
| 53 */ | |
| 54 void SkCanvasStack::clipToZOrderedBounds() { | |
| 55 SkASSERT(fList.count() == fCanvasData.count()); | |
| 56 for (int i = 0; i < fList.count(); ++i) { | |
| 57 fList[i]->clipRegion(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 //////////////////////////////////////////////////////////////////////////////// | |
| 62 | |
| 63 /** | |
| 64 * We need to handle setMatrix specially as it overwrites the matrix in each | |
| 65 * canvas unlike all other matrix operations (i.e. translate, scale, etc) which | |
| 66 * just pre-concatenate with the existing matrix. | |
| 67 */ | |
| 68 void SkCanvasStack::didSetMatrix(const SkMatrix& matrix) { | |
| 69 SkASSERT(fList.count() == fCanvasData.count()); | |
| 70 for (int i = 0; i < fList.count(); ++i) { | |
| 71 | |
| 72 SkMatrix tempMatrix = matrix; | |
| 73 tempMatrix.postTranslate(SkIntToScalar(-fCanvasData[i].origin.x()), | |
| 74 SkIntToScalar(-fCanvasData[i].origin.y())); | |
| 75 fList[i]->setMatrix(tempMatrix); | |
| 76 } | |
| 77 this->SkCanvas::didSetMatrix(matrix); | |
| 78 } | |
| 79 | |
| 80 void SkCanvasStack::onClipRect(const SkRect& r, SkRegion::Op op, ClipEdgeStyle edgeStyle) { | |
| 81 this->INHERITED::onClipRect(r, op, edgeStyle); | |
| 82 this->clipToZOrderedBounds(); | |
| 83 } | |
| 84 | |
| 85 void SkCanvasStack::onClipRRect(const SkRRect& rr, SkRegion::Op op, ClipEdgeStyle edgeStyle) { | |
| 86 this->INHERITED::onClipRRect(rr, op, edgeStyle); | |
| 87 this->clipToZOrderedBounds(); | |
| 88 } | |
| 89 | |
| 90 void SkCanvasStack::onClipPath(const SkPath& p, SkRegion::Op op, ClipEdgeStyle edgeStyle) { | |
| 91 this->INHERITED::onClipPath(p, op, edgeStyle); | |
| 92 this->clipToZOrderedBounds(); | |
| 93 } | |
| 94 | |
| 95 void SkCanvasStack::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) { | |
| 96 SkASSERT(fList.count() == fCanvasData.count()); | |
| 97 for (int i = 0; i < fList.count(); ++i) { | |
| 98 SkRegion tempRegion; | |
| 99 deviceRgn.translate(-fCanvasData[i].origin.x(), | |
| 100 -fCanvasData[i].origin.y(), &tempRegion); | |
| 101 tempRegion.op(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); | |
| 102 fList[i]->clipRegion(tempRegion, op); | |
| 103 } | |
| 104 this->SkCanvas::onClipRegion(deviceRgn, op); | |
| 105 } |
