check-point for drawables (experimental)

git-svn-id: http://skia.googlecode.com/svn/trunk@133 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 152 insertions, 0 deletions

diff --git a/src/core/SkDrawable.cpp b/src/core/SkDrawable.cpp
new file mode 100644
index 0000000000..85f3175bdb
--- /dev/null
+++ b/src/core/SkDrawable.cpp
@@ -0,0 +1,152 @@
+#include "SkDrawable.h"
+#include "SkCanvas.h"
+
+SkDrawable::SkDrawable() {
+    fMatrix.reset();
+    fParent = fFirstChild = fNextSibling = fPrevSibling = NULL;
+}
+
+SkDrawable::~SkDrawable() {
+    this->detachAllChildren();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkDrawable::resetMatrix() {
+    fMatrix.reset();
+}
+
+void SkDrawable::getMatrix(SkMatrix* matrix) const {
+    if (matrix) {
+        *matrix = fMatrix;
+    }
+}
+
+void SkDrawable::setMatrix(const SkMatrix& matrix) {
+    if (fMatrix != matrix) {
+        this->inval();
+        fMatrix = matrix;
+        this->inval();
+    }
+}
+
+void SkDrawable::draw(SkCanvas* canvas) {
+    SkAutoCanvasRestore ar(canvas, false);
+    canvas->save(SkCanvas::kMatrix_SaveFlag);
+    canvas->concat(fMatrix);
+
+    this->onDraw(canvas);
+    
+    B2FIter iter(this);
+    SkDrawable* child;
+    while ((child = iter.next()) != NULL) {
+        child->draw(canvas);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void SkDrawable::detachFromParent() {
+	SkDrawable* parent = fParent;
+
+	if (NULL == parent) {
+		return;
+    }
+    
+    this->inval();
+    
+	SkDrawable*	next = NULL;
+    
+	if (fNextSibling != this) {	// do we have any siblings
+		fNextSibling->fPrevSibling = fPrevSibling;
+		fPrevSibling->fNextSibling = fNextSibling;
+		next = fNextSibling;
+	}
+    
+	if (fParent->fFirstChild == this) {
+		fParent->fFirstChild = next;
+    }
+    
+	fParent = fNextSibling = fPrevSibling = NULL;
+	this->unref();
+}
+
+SkDrawable* SkDrawable::attachChildToBack(SkDrawable* child) {
+	SkASSERT(child != this);
+
+	if (child == NULL || fFirstChild == child) {
+		return child;
+    }
+
+	child->ref();
+	child->detachFromParent();
+
+	if (fFirstChild == NULL) {
+		child->fNextSibling = child;
+		child->fPrevSibling = child;
+	} else {
+		child->fNextSibling = fFirstChild;
+		child->fPrevSibling = fFirstChild->fPrevSibling;
+		fFirstChild->fPrevSibling->fNextSibling = child;
+		fFirstChild->fPrevSibling = child;
+	}
+
+	fFirstChild = child;
+	child->fParent = this;
+	child->inval();
+	return child;
+}
+
+SkDrawable* SkDrawable::attachChildToFront(SkDrawable* child) {
+	SkASSERT(child != this);
+
+    if (child == NULL || fFirstChild && fFirstChild->fPrevSibling == child) {
+		return child;
+    }
+
+	child->ref();
+	child->detachFromParent();
+
+	if (fFirstChild == NULL) {
+		fFirstChild = child;
+		child->fNextSibling = child;
+		child->fPrevSibling = child;
+	} else {
+		child->fNextSibling = fFirstChild;
+		child->fPrevSibling = fFirstChild->fPrevSibling;
+		fFirstChild->fPrevSibling->fNextSibling = child;
+		fFirstChild->fPrevSibling = child;
+	}
+
+	child->fParent = this;
+	child->inval();
+	return child;
+}
+
+void SkDrawable::detachAllChildren() {
+	while (fFirstChild) {
+		fFirstChild->detachFromParent();
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkDrawable::B2FIter::B2FIter(const SkDrawable* parent) {
+	fFirstChild = parent ? parent->fFirstChild : NULL;
+	fChild = fFirstChild;
+}
+
+SkDrawable*	SkDrawable::B2FIter::next() {
+	SkDrawable* curr = fChild;
+    
+	if (fChild) {
+		SkDrawable* next = fChild->fNextSibling;
+		if (next == fFirstChild) {
+			next = NULL;
+        }
+		fChild = next;
+	}
+	return curr;
+}
+
+