The Tor Browser: gfx/skia/trunk/src/utils/SkLayer.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2011 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 "SkLayer.h"

     9 #include "SkCanvas.h"

    11 //#define DEBUG_DRAW_LAYER_BOUNDS

    12 //#define DEBUG_TRACK_NEW_DELETE

    14 #ifdef DEBUG_TRACK_NEW_DELETE

    15     static int gLayerAllocCount;

    16 #endif

    18 ///////////////////////////////////////////////////////////////////////////////

    20 SkLayer::SkLayer() {

    21     fParent = NULL;

    22     m_opacity = SK_Scalar1;

    23     m_size.set(0, 0);

    24     m_position.set(0, 0);

    25     m_anchorPoint.set(SK_ScalarHalf, SK_ScalarHalf);

    27     fMatrix.reset();

    28     fChildrenMatrix.reset();

    29     fFlags = 0;

    31 #ifdef DEBUG_TRACK_NEW_DELETE

    32     gLayerAllocCount += 1;

    33     SkDebugf("SkLayer new:    %d\n", gLayerAllocCount);

    34 #endif

    35 }

    37 SkLayer::SkLayer(const SkLayer& src) : INHERITED() {

    38     fParent = NULL;

    39     m_opacity = src.m_opacity;

    40     m_size = src.m_size;

    41     m_position = src.m_position;

    42     m_anchorPoint = src.m_anchorPoint;

    44     fMatrix = src.fMatrix;

    45     fChildrenMatrix = src.fChildrenMatrix;

    46     fFlags = src.fFlags;

    48 #ifdef DEBUG_TRACK_NEW_DELETE

    49     gLayerAllocCount += 1;

    50     SkDebugf("SkLayer copy:   %d\n", gLayerAllocCount);

    51 #endif

    52 }

    54 SkLayer::~SkLayer() {

    55     this->removeChildren();

    57 #ifdef DEBUG_TRACK_NEW_DELETE

    58     gLayerAllocCount -= 1;

    59     SkDebugf("SkLayer delete: %d\n", gLayerAllocCount);

    60 #endif

    61 }

    63 ///////////////////////////////////////////////////////////////////////////////

    65 bool SkLayer::isInheritFromRootTransform() const {

    66     return (fFlags & kInheritFromRootTransform_Flag) != 0;

    67 }

    69 void SkLayer::setInheritFromRootTransform(bool doInherit) {

    70     if (doInherit) {

    71         fFlags |= kInheritFromRootTransform_Flag;

    72     } else {

    73         fFlags &= ~kInheritFromRootTransform_Flag;

    74     }

    75 }

    77 void SkLayer::setMatrix(const SkMatrix& matrix) {

    78     fMatrix = matrix;

    79 }

    81 void SkLayer::setChildrenMatrix(const SkMatrix& matrix) {

    82     fChildrenMatrix = matrix;

    83 }

    85 ///////////////////////////////////////////////////////////////////////////////

    87 int SkLayer::countChildren() const {

    88     return m_children.count();

    89 }

    91 SkLayer* SkLayer::getChild(int index) const {

    92     if ((unsigned)index < (unsigned)m_children.count()) {

    93         SkASSERT(m_children[index]->fParent == this);

    94         return m_children[index];

    95     }

    96     return NULL;

    97 }

    99 SkLayer* SkLayer::addChild(SkLayer* child) {

   100     SkASSERT(this != child);

   101     child->ref();

   102     child->detachFromParent();

   103     SkASSERT(child->fParent == NULL);

   104     child->fParent = this;

   106     *m_children.append() = child;

   107     return child;

   108 }

   110 void SkLayer::detachFromParent() {

   111     if (fParent) {

   112         int index = fParent->m_children.find(this);

   113         SkASSERT(index >= 0);

   114         fParent->m_children.remove(index);

   115         fParent = NULL;

   116         this->unref();  // this call might delete us

   117     }

   118 }

   120 void SkLayer::removeChildren() {

   121     int count = m_children.count();

   122     for (int i = 0; i < count; i++) {

   123         SkLayer* child = m_children[i];

   124         SkASSERT(child->fParent == this);

   125         child->fParent = NULL;  // in case it has more than one owner

   126         child->unref();

   127     }

   128     m_children.reset();

   129 }

   131 SkLayer* SkLayer::getRootLayer() const {

   132     const SkLayer* root = this;

   133     while (root->fParent != NULL) {

   134         root = root->fParent;

   135     }

   136     return const_cast<SkLayer*>(root);

   137 }

   139 ///////////////////////////////////////////////////////////////////////////////

   141 void SkLayer::getLocalTransform(SkMatrix* matrix) const {

   142     matrix->setTranslate(m_position.fX, m_position.fY);

   144     SkScalar tx = SkScalarMul(m_anchorPoint.fX, m_size.width());

   145     SkScalar ty = SkScalarMul(m_anchorPoint.fY, m_size.height());

   146     matrix->preTranslate(tx, ty);

   147     matrix->preConcat(this->getMatrix());

   148     matrix->preTranslate(-tx, -ty);

   149 }

   151 void SkLayer::localToGlobal(SkMatrix* matrix) const {

   152     this->getLocalTransform(matrix);

   154     if (this->isInheritFromRootTransform()) {

   155         matrix->postConcat(this->getRootLayer()->getMatrix());

   156         return;

   157     }

   159     const SkLayer* layer = this;

   160     while (layer->fParent != NULL) {

   161         layer = layer->fParent;

   163         SkMatrix tmp;

   164         layer->getLocalTransform(&tmp);

   165         tmp.preConcat(layer->getChildrenMatrix());

   166         matrix->postConcat(tmp);

   167     }

   168 }

   170 ///////////////////////////////////////////////////////////////////////////////

   172 void SkLayer::onDraw(SkCanvas*, SkScalar opacity) {

   173 //    SkDebugf("----- no onDraw for %p\n", this);

   174 }

   176 #include "SkString.h"

   178 void SkLayer::draw(SkCanvas* canvas, SkScalar opacity) {

   179 #if 0

   180     SkString str1, str2;

   181  //   this->getMatrix().toDumpString(&str1);

   182  //   this->getChildrenMatrix().toDumpString(&str2);

   183     SkDebugf("--- drawlayer %p opacity %g size [%g %g] pos [%g %g] matrix %s children %s\n",

   184              this, opacity * this->getOpacity(), m_size.width(), m_size.height(),

   185              m_position.fX, m_position.fY, str1.c_str(), str2.c_str());

   186 #endif

   188     opacity = SkScalarMul(opacity, this->getOpacity());

   189     if (opacity <= 0) {

   190 //        SkDebugf("---- abort drawing %p opacity %g\n", this, opacity);

   191         return;

   192     }

   194     SkAutoCanvasRestore acr(canvas, true);

   196     // apply our local transform

   197     {

   198         SkMatrix tmp;

   199         this->getLocalTransform(&tmp);

   200         if (this->isInheritFromRootTransform()) {

   201             // should we also apply the root's childrenMatrix?

   202             canvas->setMatrix(getRootLayer()->getMatrix());

   203         }

   204         canvas->concat(tmp);

   205     }

   207     this->onDraw(canvas, opacity);

   209 #ifdef DEBUG_DRAW_LAYER_BOUNDS

   210     {

   211         SkRect r = SkRect::MakeSize(this->getSize());

   212         SkPaint p;

   213         p.setAntiAlias(true);

   214         p.setStyle(SkPaint::kStroke_Style);

   215         p.setStrokeWidth(SkIntToScalar(2));

   216         p.setColor(0xFFFF44DD);

   217         canvas->drawRect(r, p);

   218         canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, p);

   219         canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, p);

   220     }

   221 #endif

   223     int count = this->countChildren();

   224     if (count > 0) {

   225         canvas->concat(this->getChildrenMatrix());

   226         for (int i = 0; i < count; i++) {

   227             this->getChild(i)->draw(canvas, opacity);

   228         }

   229     }

   230 }

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