Sketch splitting SkPicture into an interface and SkBigPicture.

src/core/SkBigPicture.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBBoxHierarchy.h"
+#include "SkBigPicture.h"
+#include "SkPictureCommon.h"
+#include "SkRecord.h"
+#include "SkRecordDraw.h"
+
+SkBigPicture::SkBigPicture(const SkRect& cull,
+                           SkRecord* record,
+                           SnapshotArray* drawablePicts,
+                           SkBBoxHierarchy* bbh,
+                           AccelData* accelData,
+                           size_t approxBytesUsedBySubPictures)
+    : fCullRect(cull)
+    , fApproxBytesUsedBySubPictures(approxBytesUsedBySubPictures)
+    , fRecord(record)               // Take ownership of caller's ref.
+    , fDrawablePicts(drawablePicts) // Take ownership.
+    , fBBH(bbh)                     // Take ownership of caller's ref.
+    , fAccelData(accelData)         // Take ownership of caller's ref.
+{}
+
+void SkBigPicture::playback(SkCanvas* canvas, AbortCallback* callback) const {
+    SkASSERT(canvas);
+
+    // If the query contains the whole picture, don't bother with the BBH.
+    SkRect clipBounds = { 0, 0, 0, 0 };
+    (void)canvas->getClipBounds(&clipBounds);
+    const bool useBBH = !clipBounds.contains(this->cullRect());
+
+    SkRecordDraw(*fRecord,
+                 canvas,
+                 this->drawablePicts(),
+                 nullptr,
+                 this->drawableCount(),
+                 useBBH ? fBBH.get() : nullptr,
+                 callback);
+}
+
+void SkBigPicture::partialPlayback(SkCanvas* canvas,
+                                   unsigned start,
+                                   unsigned stop,
+                                   const SkMatrix& initialCTM) const {
+    SkASSERT(canvas);
+    SkRecordPartialDraw(*fRecord,
+                        canvas,
+                        this->drawablePicts(),
+                        this->drawableCount(),
+                        start,
+                        stop,
+                        initialCTM);
+}
+
+const SkBigPicture::Analysis& SkBigPicture::analysis() const {
+    auto create = [&]() { return SkNEW_ARGS(Analysis, (*fRecord)); };
+    return *fAnalysis.get(create);
+}
+
+SkRect SkBigPicture::cullRect()            const { return fCullRect; }
+bool   SkBigPicture::hasText()             const { return this->analysis().fHasText; }
+bool   SkBigPicture::willPlayBackBitmaps() const { return this->analysis().fWillPlaybackBitmaps; }
+int    SkBigPicture::numSlowPaths() const { return this->analysis().fNumSlowPathsAndDashEffects; }
+int    SkBigPicture::approximateOpCount()   const { return fRecord->count(); }
+size_t SkBigPicture::approximateBytesUsed() const {
+    size_t bytes = sizeof(*this) + fRecord->bytesUsed() + fApproxBytesUsedBySubPictures;
+    if (fBBH) { bytes += fBBH->bytesUsed(); }
+    return bytes;
+}
+
+int SkBigPicture::drawableCount() const {
+    return fDrawablePicts ? fDrawablePicts->count() : 0;
+}
+
+SkPicture const* const* SkBigPicture::drawablePicts() const {
+    return fDrawablePicts ? fDrawablePicts->begin() : nullptr;
+}
+
+SkBigPicture::Analysis::Analysis(const SkRecord& record) {
+    SkTextHunter   text;
+    SkBitmapHunter bitmap;
+    SkPathCounter  path;
+
+    bool hasText = false, hasBitmap = false;
+    for (unsigned i = 0; i < record.count(); i++) {
+        hasText   = hasText   || record.visit<bool>(i,   text);
+        hasBitmap = hasBitmap || record.visit<bool>(i, bitmap);
+        record.visit<void>(i, path);
+    }
+
+    fHasText                    = hasText;
+    fWillPlaybackBitmaps        = hasBitmap;
+    fNumSlowPathsAndDashEffects = SkTMin<int>(path.fNumSlowPathsAndDashEffects, 255);
+}