Index: src/utils/SkCanvasStack.cpp |
diff --git a/src/utils/SkCanvasStack.cpp b/src/utils/SkCanvasStack.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c5a79536407bf55d56c57638f13e150e519c5901 |
--- /dev/null |
+++ b/src/utils/SkCanvasStack.cpp |
@@ -0,0 +1,103 @@ |
+ |
+/* |
+ * Copyright 2013 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+#include "SkCanvasStack.h" |
+ |
+SkCanvasStack::SkCanvasStack(int width, int height) |
+ : INHERITED(width, height) {} |
+ |
+SkCanvasStack::~SkCanvasStack() { |
+ this->removeAll(); |
+} |
+ |
+void SkCanvasStack::pushCanvas(SkCanvas* canvas, SkIPoint origin) { |
reed1
2013/09/04 13:00:56
nit: const SkIPoint& origin
djsollen
2013/09/04 13:34:43
Done.
|
+ if (canvas) { |
+ // compute the bounds of this canvas |
+ const SkIRect canvasBounds = SkIRect::MakeSize(canvas->getDeviceSize()); |
+ |
+ // push the canvas onto the stack |
+ SkNWayCanvas::addCanvas(canvas); |
reed1
2013/09/04 13:00:56
nit: this->...
perhaps use INHERITED instead of S
djsollen
2013/09/04 13:34:43
Done.
|
+ |
+ // push the canvas data onto the stack |
+ CanvasData* data = &fCanvasData.push_back(); |
+ data->origin = origin; |
+ data->requiredClip.setRect(canvasBounds); |
+ |
+ // subtract this region from the canvas objects already on the stack. |
+ // This ensures they do not draw into the space occupied by the layers |
+ // above them. |
+ for (int i = fList.count() - 1; i > 0; --i) { |
+ SkIRect localBounds = canvasBounds; |
+ localBounds.offset(origin - fCanvasData[i-1].origin); |
+ |
+ fCanvasData[i-1].requiredClip.op(localBounds, SkRegion::kDifference_Op); |
+ fList[i-i]->clipRegion(fCanvasData[i-1].requiredClip); |
+ } |
+ } |
+ SkASSERT(fList.count() == fCanvasData.count()); |
+} |
+ |
+void SkCanvasStack::removeAll() { |
+ fCanvasData.reset(); |
+ SkNWayCanvas::removeAll(); |
reed1
2013/09/04 13:00:56
nit: this->...
djsollen
2013/09/04 13:34:43
Done.
|
+} |
+ |
+//////////////////////////////////////////////////////////////////////////////// |
+ |
+void SkCanvasStack::setMatrix(const SkMatrix& matrix) { |
reed1
2013/09/04 13:00:56
Perhaps a comment-block nearby explaining why we h
|
+ SkASSERT(fList.count() == fCanvasData.count()); |
+ for (int i = 0; i < fList.count(); ++i) { |
+ |
+ SkMatrix tempMatrix = matrix; |
+ tempMatrix.postTranslate(SkIntToScalar(-fCanvasData[i].origin.x()), |
+ SkIntToScalar(-fCanvasData[i].origin.y())); |
+ fList[i]->setMatrix(tempMatrix); |
+ } |
+ this->SkCanvas::setMatrix(matrix); |
+} |
+ |
+bool SkCanvasStack::clipRect(const SkRect& r, SkRegion::Op op, bool aa) { |
+ bool result = SkNWayCanvas::clipRect(r, op, aa); |
+ |
+ SkASSERT(fList.count() == fCanvasData.count()); |
+ for (int i = 0; i < fList.count(); ++i) { |
+ fList[i]->clipRegion(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); |
reed1
2013/09/04 13:00:56
simple comment explaining why we need this Interse
djsollen
2013/09/04 13:34:43
Done.
|
+ } |
+ return result; |
+} |
+ |
+bool SkCanvasStack::clipRRect(const SkRRect& rr, SkRegion::Op op, bool aa) { |
+ bool result = SkNWayCanvas::clipRRect(rr, op, aa); |
+ |
+ SkASSERT(fList.count() == fCanvasData.count()); |
+ for (int i = 0; i < fList.count(); ++i) { |
+ fList[i]->clipRegion(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); |
+ } |
+ return result; |
+} |
+ |
+bool SkCanvasStack::clipPath(const SkPath& p, SkRegion::Op op, bool aa) { |
+ bool result = SkNWayCanvas::clipPath(p, op, aa); |
+ |
+ SkASSERT(fList.count() == fCanvasData.count()); |
+ for (int i = 0; i < fList.count(); ++i) { |
+ fList[i]->clipRegion(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); |
+ } |
+ return result; |
+} |
+ |
+bool SkCanvasStack::clipRegion(const SkRegion& deviceRgn, SkRegion::Op op) { |
+ SkASSERT(fList.count() == fCanvasData.count()); |
+ for (int i = 0; i < fList.count(); ++i) { |
+ SkRegion tempRegion; |
+ deviceRgn.translate(-fCanvasData[i].origin.x(), |
+ -fCanvasData[i].origin.y(), &tempRegion); |
+ tempRegion.op(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); |
+ fList[i]->clipRegion(tempRegion, op); |
+ } |
+ return this->SkCanvas::clipRegion(deviceRgn, op); |
+} |