blob: aaca7860800709a6efacb856211163ced9dbf96e [file] [log] [blame]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkLayer.h"
#include "SkCanvas.h"
//#define DEBUG_DRAW_LAYER_BOUNDS
//#define DEBUG_TRACK_NEW_DELETE
#ifdef DEBUG_TRACK_NEW_DELETE
static int gLayerAllocCount;
#endif
///////////////////////////////////////////////////////////////////////////////
SkLayer::SkLayer() {
fParent = NULL;
m_opacity = SK_Scalar1;
m_size.set(0, 0);
m_position.set(0, 0);
m_anchorPoint.set(SK_ScalarHalf, SK_ScalarHalf);
fMatrix.reset();
fChildrenMatrix.reset();
fFlags = 0;
#ifdef DEBUG_TRACK_NEW_DELETE
gLayerAllocCount += 1;
SkDebugf("SkLayer new: %d\n", gLayerAllocCount);
#endif
}
SkLayer::SkLayer(const SkLayer& src) : INHERITED() {
fParent = NULL;
m_opacity = src.m_opacity;
m_size = src.m_size;
m_position = src.m_position;
m_anchorPoint = src.m_anchorPoint;
fMatrix = src.fMatrix;
fChildrenMatrix = src.fChildrenMatrix;
fFlags = src.fFlags;
#ifdef DEBUG_TRACK_NEW_DELETE
gLayerAllocCount += 1;
SkDebugf("SkLayer copy: %d\n", gLayerAllocCount);
#endif
}
SkLayer::~SkLayer() {
this->removeChildren();
#ifdef DEBUG_TRACK_NEW_DELETE
gLayerAllocCount -= 1;
SkDebugf("SkLayer delete: %d\n", gLayerAllocCount);
#endif
}
///////////////////////////////////////////////////////////////////////////////
bool SkLayer::isInheritFromRootTransform() const {
return (fFlags & kInheritFromRootTransform_Flag) != 0;
}
void SkLayer::setInheritFromRootTransform(bool doInherit) {
if (doInherit) {
fFlags |= kInheritFromRootTransform_Flag;
} else {
fFlags &= ~kInheritFromRootTransform_Flag;
}
}
void SkLayer::setMatrix(const SkMatrix& matrix) {
fMatrix = matrix;
}
void SkLayer::setChildrenMatrix(const SkMatrix& matrix) {
fChildrenMatrix = matrix;
}
///////////////////////////////////////////////////////////////////////////////
int SkLayer::countChildren() const {
return m_children.count();
}
SkLayer* SkLayer::getChild(int index) const {
if ((unsigned)index < (unsigned)m_children.count()) {
SkASSERT(m_children[index]->fParent == this);
return m_children[index];
}
return NULL;
}
SkLayer* SkLayer::addChild(SkLayer* child) {
SkASSERT(this != child);
child->ref();
child->detachFromParent();
SkASSERT(child->fParent == NULL);
child->fParent = this;
*m_children.append() = child;
return child;
}
void SkLayer::detachFromParent() {
if (fParent) {
int index = fParent->m_children.find(this);
SkASSERT(index >= 0);
fParent->m_children.remove(index);
fParent = NULL;
this->unref(); // this call might delete us
}
}
void SkLayer::removeChildren() {
int count = m_children.count();
for (int i = 0; i < count; i++) {
SkLayer* child = m_children[i];
SkASSERT(child->fParent == this);
child->fParent = NULL; // in case it has more than one owner
child->unref();
}
m_children.reset();
}
SkLayer* SkLayer::getRootLayer() const {
const SkLayer* root = this;
while (root->fParent != NULL) {
root = root->fParent;
}
return const_cast<SkLayer*>(root);
}
///////////////////////////////////////////////////////////////////////////////
void SkLayer::getLocalTransform(SkMatrix* matrix) const {
matrix->setTranslate(m_position.fX, m_position.fY);
SkScalar tx = SkScalarMul(m_anchorPoint.fX, m_size.width());
SkScalar ty = SkScalarMul(m_anchorPoint.fY, m_size.height());
matrix->preTranslate(tx, ty);
matrix->preConcat(this->getMatrix());
matrix->preTranslate(-tx, -ty);
}
void SkLayer::localToGlobal(SkMatrix* matrix) const {
this->getLocalTransform(matrix);
if (this->isInheritFromRootTransform()) {
matrix->postConcat(this->getRootLayer()->getMatrix());
return;
}
const SkLayer* layer = this;
while (layer->fParent != NULL) {
layer = layer->fParent;
SkMatrix tmp;
layer->getLocalTransform(&tmp);
tmp.preConcat(layer->getChildrenMatrix());
matrix->postConcat(tmp);
}
}
///////////////////////////////////////////////////////////////////////////////
void SkLayer::onDraw(SkCanvas*, SkScalar opacity) {
// SkDebugf("----- no onDraw for %p\n", this);
}
#include "SkString.h"
void SkLayer::draw(SkCanvas* canvas, SkScalar opacity) {
#if 0
SkString str1, str2;
// this->getMatrix().toDumpString(&str1);
// this->getChildrenMatrix().toDumpString(&str2);
SkDebugf("--- drawlayer %p opacity %g size [%g %g] pos [%g %g] matrix %s children %s\n",
this, opacity * this->getOpacity(), m_size.width(), m_size.height(),
m_position.fX, m_position.fY, str1.c_str(), str2.c_str());
#endif
opacity = SkScalarMul(opacity, this->getOpacity());
if (opacity <= 0) {
// SkDebugf("---- abort drawing %p opacity %g\n", this, opacity);
return;
}
SkAutoCanvasRestore acr(canvas, true);
// apply our local transform
{
SkMatrix tmp;
this->getLocalTransform(&tmp);
if (this->isInheritFromRootTransform()) {
// should we also apply the root's childrenMatrix?
canvas->setMatrix(getRootLayer()->getMatrix());
}
canvas->concat(tmp);
}
this->onDraw(canvas, opacity);
#ifdef DEBUG_DRAW_LAYER_BOUNDS
{
SkRect r = SkRect::MakeSize(this->getSize());
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SkIntToScalar(2));
p.setColor(0xFFFF44DD);
canvas->drawRect(r, p);
canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, p);
canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, p);
}
#endif
int count = this->countChildren();
if (count > 0) {
canvas->concat(this->getChildrenMatrix());
for (int i = 0; i < count; i++) {
this->getChild(i)->draw(canvas, opacity);
}
}
}