Add a means of extracting active operations from SkPicture

src/core/SkPicturePlayback.cpp

 
 /*
  * 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 <new>
 #include "SkBBoxHierarchy.h"
 #include "SkOffsetTable.h"
@@ skipping 51 matching lines @@
 
     SkDebugf("\n");
 #endif
 #ifdef SK_DEBUG_DUMP
     record.dumpMatrices();
     record.dumpPaints();
 #endif
 
     record.validate(record.writeStream().bytesWritten(), 0);
     const SkWriter32& writer = record.writeStream();
-    init();
+    this->init();
     if (writer.bytesWritten() == 0) {
         fOpData = SkData::NewEmpty();
         return;
     }
 
     fBoundingHierarchy = record.fBoundingHierarchy;
     fStateTree = record.fStateTree;
 
     SkSafeRef(fBoundingHierarchy);
     SkSafeRef(fStateTree);
@@ skipping 177 matching lines @@
 
 void SkPicturePlayback::init() {
     fBitmaps = NULL;
     fPaints = NULL;
     fPictureRefs = NULL;
     fPictureCount = 0;
     fOpData = NULL;
     fFactoryPlayback = NULL;
     fBoundingHierarchy = NULL;
     fStateTree = NULL;
+    fCachedActiveOps = NULL;
 }
 
 SkPicturePlayback::~SkPicturePlayback() {
     SkSafeUnref(fOpData);
 
     SkSafeUnref(fBitmaps);
     SkSafeUnref(fPaints);
     SkSafeUnref(fBoundingHierarchy);
     SkSafeUnref(fStateTree);
 
+    SkDELETE(fCachedActiveOps);
+
     for (int i = 0; i < fPictureCount; i++) {
         fPictureRefs[i]->unref();
     }
     SkDELETE_ARRAY(fPictureRefs);
 
     SkDELETE(fFactoryPlayback);
 }
 
 void SkPicturePlayback::dumpSize() const {
     SkDebugf("--- picture size: ops=%d bitmaps=%d [%d] paints=%d [%d] paths=%d\n",
@@ skipping 463 matching lines @@
         if (MASK_24 == *size) {
             *size = reader->readInt();
         }
     }
     return (DrawType) op;
 }
 
 // The activeOps parameter is actually "const SkTDArray<SkPictureStateTree::Draw*>&".
 // It represents the operations about to be drawn, as generated by some spatial
 // subdivision helper class. It should already be in 'fOffset' sorted order.
-void SkPicturePlayback::preLoadBitmaps(const SkTDArray<void*>& activeOps) {
-    if (0 == activeOps.count() || NULL == fBitmapUseOffsets) {
+void SkPicturePlayback::preLoadBitmaps(const SkTDArray<void*>* activeOps) {
+    if ((NULL != activeOps && 0 == activeOps->count()) || NULL == fBitmapUseOffsets) {
+        return;
+    }
+
+    if (NULL == activeOps) {
+        // going to need everything
         return;
     }
 
     SkTDArray<int> active;
 
     SkAutoTDeleteArray<bool> needToCheck(new bool[fBitmapUseOffsets->numIDs()]);
     for (int i = 0; i < fBitmapUseOffsets->numIDs(); ++i) {
         needToCheck.get()[i] = true;
     }
 
-    uint32_t max = ((SkPictureStateTree::Draw*)activeOps[activeOps.count()-1])->fOffset;
+    uint32_t max = ((SkPictureStateTree::Draw*)(*activeOps)[(*activeOps).count()-1])->fOffset;
 
-    for (int i = 0; i < activeOps.count(); ++i) {
-        SkPictureStateTree::Draw* draw = (SkPictureStateTree::Draw*) activeOps[i];
+    for (int i = 0; i < activeOps->count(); ++i) {
+        SkPictureStateTree::Draw* draw = (SkPictureStateTree::Draw*) (*activeOps)[i];
 
         for (int j = 0; j < fBitmapUseOffsets->numIDs(); ++j) {
             if (!needToCheck.get()[j]) {
                 continue;
             }
 
             if (!fBitmapUseOffsets->overlap(j, draw->fOffset, max)) {
                 needToCheck.get()[j] = false;
                 continue;
             }
 
             if (!fBitmapUseOffsets->includes(j, draw->fOffset)) {
                 continue;
             }
 
             *active.append() = j;
             needToCheck.get()[j] = false;
         }
     }
 
     for (int i = 0; i < active.count(); ++i) {
         SkDebugf("preload texture %d\n", active[i]);
     }
 }
 
+uint32_t SkPicturePlayback::CachedOperationList::offset(int index) const {
+    SkASSERT(index < fOps.count());
+    return ((SkPictureStateTree::Draw*)fOps[index])->fOffset;
+}
+
+const SkMatrix& SkPicturePlayback::CachedOperationList::matrix(int index) const {
+    SkASSERT(index < fOps.count());
+    return *((SkPictureStateTree::Draw*)fOps[index])->fMatrix;
+}
+
+const SkPicture::OperationList& SkPicturePlayback::getActiveOps(const SkIRect& query) {
+    if (NULL == fStateTree || NULL == fBoundingHierarchy) {
+        return SkPicture::OperationList::InvalidList();
+    }
+
+    if (NULL == fCachedActiveOps) {
+        fCachedActiveOps = SkNEW(CachedOperationList);
+    }
+
+    if (query == fCachedActiveOps->fCacheQueryRect) {
+        return *fCachedActiveOps;
+    }
+
+    fCachedActiveOps->fOps.rewind();
+
+    fBoundingHierarchy->search(query, &(fCachedActiveOps->fOps));
+
+    SkTQSort<SkPictureStateTree::Draw>(
+        reinterpret_cast<SkPictureStateTree::Draw**>(fCachedActiveOps->fOps.begin()),
+        reinterpret_cast<SkPictureStateTree::Draw**>(fCachedActiveOps->fOps.end()-1));
+
+    fCachedActiveOps->fCacheQueryRect = query;
+    return *fCachedActiveOps;
+}
+
 void SkPicturePlayback::draw(SkCanvas& canvas, SkDrawPictureCallback* callback) {
 #ifdef ENABLE_TIME_DRAW
     SkAutoTime  at("SkPicture::draw", 50);
 #endif
 
 #ifdef SPEW_CLIP_SKIPPING
     SkipClipRec skipRect, skipRRect, skipRegion, skipPath, skipCull;
     int opCount = 0;
 #endif
 
 #ifdef SK_BUILD_FOR_ANDROID
     SkAutoMutexAcquire autoMutex(fDrawMutex);
 #endif
 
     // kDrawComplete will be the signal that we have reached the end of
     // the command stream
     static const uint32_t kDrawComplete = SK_MaxU32;
 
     SkReader32 reader(fOpData->bytes(), fOpData->size());
     TextContainer text;
-    SkTDArray<void*> activeOps;
+    const SkTDArray<void*>* activeOps = NULL;
 
     if (NULL != fStateTree && NULL != fBoundingHierarchy) {
         SkRect clipBounds;
         if (canvas.getClipBounds(&clipBounds)) {
             SkIRect query;
             clipBounds.roundOut(&query);
-            fBoundingHierarchy->search(query, &activeOps);
-            if (activeOps.count() == 0) {
-                return;
+
+            const SkPicture::OperationList& activeOpsList = this->getActiveOps(query);
+            if (activeOpsList.valid()) {
+                if (0 == activeOpsList.numOps()) {
+                    return;     // nothing to draw
+                }
+                
+                // Since the opList is valid we know it is our derived class
+                activeOps = &((const CachedOperationList&)activeOpsList).fOps;
             }
-            SkTQSort<SkPictureStateTree::Draw>(
-                reinterpret_cast<SkPictureStateTree::Draw**>(activeOps.begin()),
-                reinterpret_cast<SkPictureStateTree::Draw**>(activeOps.end()-1));
         }
     }
 
-    SkPictureStateTree::Iterator it = (NULL == fStateTree) ?
+    SkPictureStateTree::Iterator it = (NULL == activeOps) ?
         SkPictureStateTree::Iterator() :
-        fStateTree->getIterator(activeOps, &canvas);
+        fStateTree->getIterator(*activeOps, &canvas);
 
     if (it.isValid()) {
         uint32_t skipTo = it.draw();
         if (kDrawComplete == skipTo) {
             return;
         }
         reader.setOffset(skipTo);
     }
 
     this->preLoadBitmaps(activeOps);
@@ skipping 911 matching lines @@
     for (index = 0; index < fPictureCount; index++)
         bufferPtr += snprintf(bufferPtr, DUMP_BUFFER_SIZE - (bufferPtr - pBuffer),
             "picture%p, ", fPictureRefs[index]);
     if (fPictureCount > 0)
         SkDebugf("%s0};\n", pBuffer);
 
     const_cast<SkPicturePlayback*>(this)->dumpStream();
 }
 
 #endif