Split SkPicturePlayback out of SkPictureData

src/core/SkPicturePlayback.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCanvas.h"
+#include "SkPictureData.h"
+#include "SkPicturePlayback.h"
+#include "SkPictureRecord.h"
+#include "SkPictureStateTree.h"
+#include "SkReader32.h"
+#include "SkTDArray.h"
+#include "SkTypes.h"
+
+SkPicturePlayback::PlaybackReplacements::ReplacementInfo*
+SkPicturePlayback::PlaybackReplacements::push() {
+    SkDEBUGCODE(this->validate());
+    return fReplacements.push();
+}
+
+void SkPicturePlayback::PlaybackReplacements::freeAll() {
+    for (int i = 0; i < fReplacements.count(); ++i) {
+        SkDELETE(fReplacements[i].fBM);
+    }
+    fReplacements.reset();
+}
+
+#ifdef SK_DEBUG
+void SkPicturePlayback::PlaybackReplacements::validate() const {
+    // Check that the ranges are monotonically increasing and non-overlapping
+    if (fReplacements.count() > 0) {
+        SkASSERT(fReplacements[0].fStart < fReplacements[0].fStop);
+
+        for (int i = 1; i < fReplacements.count(); ++i) {
+            SkASSERT(fReplacements[i].fStart < fReplacements[i].fStop);
+            SkASSERT(fReplacements[i - 1].fStop < fReplacements[i].fStart);
+        }
+    }
+}
+#endif
+
+// TODO: Replace with hash or pass in "lastLookedUp" hint
+SkPicturePlayback::PlaybackReplacements::ReplacementInfo*
+SkPicturePlayback::PlaybackReplacements::lookupByStart(size_t start) {
+    SkDEBUGCODE(this->validate());
+    for (int i = 0; i < fReplacements.count(); ++i) {
+        if (start == fReplacements[i].fStart) {
+            return &fReplacements[i];
+        } else if (start < fReplacements[i].fStart) {
+            return NULL;  // the ranges are monotonically increasing and non-overlapping
+        }
+    }
+
+    return NULL;
+}
+
+
+class SkAutoResetOpID {
+public:
+    SkAutoResetOpID(SkPicturePlayback* playback) : fPlayback(playback) { }
+    ~SkAutoResetOpID() {
+        if (NULL != fPlayback) {
+            fPlayback->resetOpID();
+        }
+    }
+
+private:
+    SkPicturePlayback* fPlayback;
+};
+
+/*
+* Read the next op code and chunk size from 'reader'. The returned size
+* is the entire size of the chunk (including the opcode). Thus, the
+* offset just prior to calling read_op_and_size + 'size' is the offset
+* to the next chunk's op code. This also means that the size of a chunk
+* with no arguments (just an opcode) will be 4.
+*/
+static DrawType read_op_and_size(SkReader32* reader, uint32_t* size) {
+    uint32_t temp = reader->readInt();
+    uint32_t op;
+    if (((uint8_t)temp) == temp) {
+        // old skp file - no size information
+        op = temp;
+        *size = 0;
+    } else {
+        UNPACK_8_24(temp, op, *size);
+        if (MASK_24 == *size) {
+            *size = reader->readInt();
+        }
+    }
+    return (DrawType)op;
+}
+
+
+static const SkRect* get_rect_ptr(SkReader32& reader) {
+    if (reader.readBool()) {
+        return &reader.skipT<SkRect>();
+    } else {
+        return NULL;
+    }
+}
+
+class TextContainer {
+public:
+    size_t length() { return fByteLength; }
+    const void* text() { return (const void*)fText; }
+    size_t fByteLength;
+    const char* fText;
+};
+
+void get_text(SkReader32* reader, TextContainer* text) {
+    size_t length = text->fByteLength = reader->readInt();
+    text->fText = (const char*)reader->skip(length);
+}
+
+void SkPicturePlayback::draw(SkCanvas* canvas, SkDrawPictureCallback* callback) {
+    SkAutoResetOpID aroi(this);
+    SkASSERT(0 == fCurOffset);
+
+#ifdef ENABLE_TIME_DRAW
+    SkAutoTime  at("SkPicture::draw", 50);
+#endif
+
+#ifdef SPEW_CLIP_SKIPPING
+    SkipClipRec skipRect, skipRRect, skipRegion, skipPath, skipCull;
+    int opCount = 0;
+#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(fPictureData->fOpData->bytes(), fPictureData->fOpData->size());
+    TextContainer text;
+    SkAutoTDelete<const SkPicture::OperationList> activeOpsList;
+    const SkTDArray<void*>* activeOps = NULL;
+
+    // When draw limits are enabled (i.e., 0 != fStart || 0 != fStop) the state
+    // tree isn't used to pick and choose the draw operations
+    if (0 == fStart && 0 == fStop) {
+        if (fUseBBH && NULL != fPictureData->fStateTree && NULL != fPictureData->fBoundingHierarchy) {
+            SkRect clipBounds;
+            if (canvas->getClipBounds(&clipBounds)) {
+                SkIRect query;
+                clipBounds.roundOut(&query);
+
+                activeOpsList.reset(fPictureData->getActiveOps(query));
+                if (NULL != activeOpsList.get()) {
+                    if (0 == activeOpsList->numOps()) {
+                        return;     // nothing to draw
+                    }
+
+                    // Since the opList is valid we know it is our derived class
+                    activeOps = &((const SkPictureData::OperationList*)activeOpsList.get())->fOps;
+                }
+            }
+        }
+    }
+
+    SkPictureStateTree::Iterator it = (NULL == activeOps) ?
+        SkPictureStateTree::Iterator() :
+        fPictureData->fStateTree->getIterator(*activeOps, canvas);
+
+    if (0 != fStart || 0 != fStop) {
+        reader.setOffset(fStart);
+        uint32_t size;
+        SkDEBUGCODE(DrawType op = ) read_op_and_size(&reader, &size);
+        SkASSERT(SAVE_LAYER == op);
+        reader.setOffset(fStart + size);
+    }
+
+    if (it.isValid()) {
+        uint32_t skipTo = it.nextDraw();
+        if (kDrawComplete == skipTo) {
+            return;
+        }
+        reader.setOffset(skipTo);
+    }
+
+    // Record this, so we can concat w/ it if we encounter a setMatrix()
+    SkMatrix initialMatrix = canvas->getTotalMatrix();
+
+    SkAutoCanvasRestore acr(canvas, false);
+
+#ifdef SK_DEVELOPER
+    int opIndex = -1;
+#endif
+
+    while (!reader.eof()) {
+        if (callback && callback->abortDrawing()) {
+            return;
+        }
+
+        if (0 != fStart || 0 != fStop) {
+            size_t offset = reader.offset();
+            if (offset >= fStop) {
+                uint32_t size;
+                SkDEBUGCODE(DrawType op = ) read_op_and_size(&reader, &size);
+                SkASSERT(RESTORE == op);
+                return;
+            }
+        }
+
+        if (NULL != fReplacements) {
+            // Potentially replace a block of operations with a single drawBitmap call
+            SkPicturePlayback::PlaybackReplacements::ReplacementInfo* temp =
+                fReplacements->lookupByStart(reader.offset());
+            if (NULL != temp) {
+                SkASSERT(NULL != temp->fBM);
+                SkASSERT(NULL != temp->fPaint);
+                canvas->save();
+                canvas->setMatrix(initialMatrix);
+                SkRect src = SkRect::Make(temp->fSrcRect);
+                SkRect dst = SkRect::MakeXYWH(temp->fPos.fX, temp->fPos.fY,
+                                              temp->fSrcRect.width(),
+                                              temp->fSrcRect.height());
+                canvas->drawBitmapRectToRect(*temp->fBM, &src, dst, temp->fPaint);
+                canvas->restore();
+
+                if (it.isValid()) {
+                    // This save is needed since the BBH will automatically issue
+                    // a restore to balanced the saveLayer we're skipping
+                    canvas->save();
+
+                    // At this point we know that the PictureStateTree was aiming
+                    // for some draw op within temp's saveLayer (although potentially
+                    // in a separate saveLayer nested inside it).
+                    // We need to skip all the operations inside temp's range
+                    // along with all the associated state changes but update
+                    // the state tree to the first operation outside temp's range.
+
+                    uint32_t skipTo;
+                    do {
+                        skipTo = it.nextDraw();
+                        if (kDrawComplete == skipTo) {
+                            break;
+                        }
+
+                        if (skipTo <= temp->fStop) {
+                            reader.setOffset(skipTo);
+                            uint32_t size;
+                            DrawType op = read_op_and_size(&reader, &size);
+                            // Since we are relying on the normal SkPictureStateTree
+                            // playback we need to convert any nested saveLayer calls
+                            // it may issue into saves (so that all its internal
+                            // restores will be balanced).
+                            if (SAVE_LAYER == op) {
+                                canvas->save();
+                            }
+                        }
+                    } while (skipTo <= temp->fStop);
+
+                    if (kDrawComplete == skipTo) {
+                        break;
+                    }
+
+                    reader.setOffset(skipTo);
+                } else {
+                    reader.setOffset(temp->fStop);
+                    uint32_t size;
+                    SkDEBUGCODE(DrawType op = ) read_op_and_size(&reader, &size);
+                    SkASSERT(RESTORE == op);
+                }
+                continue;
+            }
+        }
+
+#ifdef SPEW_CLIP_SKIPPING
+        opCount++;
+#endif
+
+        fCurOffset = reader.offset();
+        uint32_t size;
+        DrawType op = read_op_and_size(&reader, &size);
+        size_t skipTo = 0;
+        if (NOOP == op) {
+            // NOOPs are to be ignored - do not propagate them any further
+            skipTo = fCurOffset + size;
+#ifdef SK_DEVELOPER
+        } else {
+            opIndex++;
+            if (this->preDraw(opIndex, op)) {
+                skipTo = fCurOffset + size;
+            }
+#endif
+        }
+
+        if (0 != skipTo) {
+            if (it.isValid()) {
+                // If using a bounding box hierarchy, advance the state tree
+                // iterator until at or after skipTo
+                uint32_t adjustedSkipTo;
+                do {
+                    adjustedSkipTo = it.nextDraw();
+                } while (adjustedSkipTo < skipTo);
+                skipTo = adjustedSkipTo;
+            }
+            if (kDrawComplete == skipTo) {
+                break;
+            }
+            reader.setOffset(skipTo);
+            continue;
+        }
+
+        switch (op) {
+        case CLIP_PATH: {
+            const SkPath& path = fPictureData->getPath(reader);
+            uint32_t packed = reader.readInt();
+            SkRegion::Op regionOp = ClipParams_unpackRegionOp(packed);
+            bool doAA = ClipParams_unpackDoAA(packed);
+            size_t offsetToRestore = reader.readInt();
+            SkASSERT(!offsetToRestore || offsetToRestore >= reader.offset());
+            canvas->clipPath(path, regionOp, doAA);
+            if (canvas->isClipEmpty() && offsetToRestore) {
+#ifdef SPEW_CLIP_SKIPPING
+                skipPath.recordSkip(offsetToRestore - reader.offset());
+#endif
+                reader.setOffset(offsetToRestore);
+            }
+        } break;
+        case CLIP_REGION: {
+            SkRegion region;
+            reader.readRegion(&region);
+            uint32_t packed = reader.readInt();
+            SkRegion::Op regionOp = ClipParams_unpackRegionOp(packed);
+            size_t offsetToRestore = reader.readInt();
+            SkASSERT(!offsetToRestore || offsetToRestore >= reader.offset());
+            canvas->clipRegion(region, regionOp);
+            if (canvas->isClipEmpty() && offsetToRestore) {
+#ifdef SPEW_CLIP_SKIPPING
+                skipRegion.recordSkip(offsetToRestore - reader.offset());
+#endif
+                reader.setOffset(offsetToRestore);
+            }
+        } break;
+        case CLIP_RECT: {
+            const SkRect& rect = reader.skipT<SkRect>();
+            uint32_t packed = reader.readInt();
+            SkRegion::Op regionOp = ClipParams_unpackRegionOp(packed);
+            bool doAA = ClipParams_unpackDoAA(packed);
+            size_t offsetToRestore = reader.readInt();
+            SkASSERT(!offsetToRestore || offsetToRestore >= reader.offset());
+            canvas->clipRect(rect, regionOp, doAA);
+            if (canvas->isClipEmpty() && offsetToRestore) {
+#ifdef SPEW_CLIP_SKIPPING
+                skipRect.recordSkip(offsetToRestore - reader.offset());
+#endif
+                reader.setOffset(offsetToRestore);
+            }
+        } break;
+        case CLIP_RRECT: {
+            SkRRect rrect;
+            reader.readRRect(&rrect);
+            uint32_t packed = reader.readInt();
+            SkRegion::Op regionOp = ClipParams_unpackRegionOp(packed);
+            bool doAA = ClipParams_unpackDoAA(packed);
+            size_t offsetToRestore = reader.readInt();
+            SkASSERT(!offsetToRestore || offsetToRestore >= reader.offset());
+            canvas->clipRRect(rrect, regionOp, doAA);
+            if (canvas->isClipEmpty() && offsetToRestore) {
+#ifdef SPEW_CLIP_SKIPPING
+                skipRRect.recordSkip(offsetToRestore - reader.offset());
+#endif
+                reader.setOffset(offsetToRestore);
+            }
+        } break;
+        case PUSH_CULL: {
+            const SkRect& cullRect = reader.skipT<SkRect>();
+            size_t offsetToRestore = reader.readInt();
+            if (offsetToRestore && canvas->quickReject(cullRect)) {
+#ifdef SPEW_CLIP_SKIPPING
+                skipCull.recordSkip(offsetToRestore - reader.offset());
+#endif
+                reader.setOffset(offsetToRestore);
+            } else {
+                canvas->pushCull(cullRect);
+            }
+        } break;
+        case POP_CULL:
+            canvas->popCull();
+            break;
+        case CONCAT: {
+            SkMatrix matrix;
+            reader.readMatrix(&matrix);
+            canvas->concat(matrix);
+            break;
+        }
+        case DRAW_BITMAP: {
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            const SkBitmap& bitmap = fPictureData->getBitmap(reader);
+            const SkPoint& loc = reader.skipT<SkPoint>();
+            canvas->drawBitmap(bitmap, loc.fX, loc.fY, paint);
+        } break;
+        case DRAW_BITMAP_RECT_TO_RECT: {
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            const SkBitmap& bitmap = fPictureData->getBitmap(reader);
+            const SkRect* src = get_rect_ptr(reader);   // may be null
+            const SkRect& dst = reader.skipT<SkRect>();     // required
+            SkCanvas::DrawBitmapRectFlags flags;
+            flags = (SkCanvas::DrawBitmapRectFlags) reader.readInt();
+            canvas->drawBitmapRectToRect(bitmap, src, dst, paint, flags);
+        } break;
+        case DRAW_BITMAP_MATRIX: {
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            const SkBitmap& bitmap = fPictureData->getBitmap(reader);
+            SkMatrix matrix;
+            reader.readMatrix(&matrix);
+            canvas->drawBitmapMatrix(bitmap, matrix, paint);
+        } break;
+        case DRAW_BITMAP_NINE: {
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            const SkBitmap& bitmap = fPictureData->getBitmap(reader);
+            const SkIRect& src = reader.skipT<SkIRect>();
+            const SkRect& dst = reader.skipT<SkRect>();
+            canvas->drawBitmapNine(bitmap, src, dst, paint);
+        } break;
+        case DRAW_CLEAR:
+            canvas->clear(reader.readInt());
+            break;
+        case DRAW_DATA: {
+            size_t length = reader.readInt();
+            canvas->drawData(reader.skip(length), length);
+            // skip handles padding the read out to a multiple of 4
+        } break;
+        case DRAW_DRRECT: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            SkRRect outer, inner;
+            reader.readRRect(&outer);
+            reader.readRRect(&inner);
+            canvas->drawDRRect(outer, inner, paint);
+        } break;
+        case BEGIN_COMMENT_GROUP: {
+            const char* desc = reader.readString();
+            canvas->beginCommentGroup(desc);
+        } break;
+        case COMMENT: {
+            const char* kywd = reader.readString();
+            const char* value = reader.readString();
+            canvas->addComment(kywd, value);
+        } break;
+        case END_COMMENT_GROUP: {
+            canvas->endCommentGroup();
+        } break;
+        case DRAW_OVAL: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            canvas->drawOval(reader.skipT<SkRect>(), paint);
+        } break;
+        case DRAW_PAINT:
+            canvas->drawPaint(*fPictureData->getPaint(reader));
+            break;
+        case DRAW_PATH: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            canvas->drawPath(fPictureData->getPath(reader), paint);
+        } break;
+        case DRAW_PICTURE:
+            canvas->drawPicture(fPictureData->getPicture(reader));
+            break;
+        case DRAW_POINTS: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            SkCanvas::PointMode mode = (SkCanvas::PointMode)reader.readInt();
+            size_t count = reader.readInt();
+            const SkPoint* pts = (const SkPoint*)reader.skip(sizeof(SkPoint)* count);
+            canvas->drawPoints(mode, count, pts, paint);
+        } break;
+        case DRAW_POS_TEXT: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            size_t points = reader.readInt();
+            const SkPoint* pos = (const SkPoint*)reader.skip(points * sizeof(SkPoint));
+            canvas->drawPosText(text.text(), text.length(), pos, paint);
+        } break;
+        case DRAW_POS_TEXT_TOP_BOTTOM: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            size_t points = reader.readInt();
+            const SkPoint* pos = (const SkPoint*)reader.skip(points * sizeof(SkPoint));
+            const SkScalar top = reader.readScalar();
+            const SkScalar bottom = reader.readScalar();
+            if (!canvas->quickRejectY(top, bottom)) {
+                canvas->drawPosText(text.text(), text.length(), pos, paint);
+            }
+        } break;
+        case DRAW_POS_TEXT_H: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            size_t xCount = reader.readInt();
+            const SkScalar constY = reader.readScalar();
+            const SkScalar* xpos = (const SkScalar*)reader.skip(xCount * sizeof(SkScalar));
+            canvas->drawPosTextH(text.text(), text.length(), xpos, constY, paint);
+        } break;
+        case DRAW_POS_TEXT_H_TOP_BOTTOM: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            size_t xCount = reader.readInt();
+            const SkScalar* xpos = (const SkScalar*)reader.skip((3 + xCount) * sizeof(SkScalar));
+            const SkScalar top = *xpos++;
+            const SkScalar bottom = *xpos++;
+            const SkScalar constY = *xpos++;
+            if (!canvas->quickRejectY(top, bottom)) {
+                canvas->drawPosTextH(text.text(), text.length(), xpos, constY, paint);
+            }
+        } break;
+        case DRAW_RECT: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            canvas->drawRect(reader.skipT<SkRect>(), paint);
+        } break;
+        case DRAW_RRECT: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            SkRRect rrect;
+            reader.readRRect(&rrect);
+            canvas->drawRRect(rrect, paint);
+        } break;
+        case DRAW_SPRITE: {
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            const SkBitmap& bitmap = fPictureData->getBitmap(reader);
+            int left = reader.readInt();
+            int top = reader.readInt();
+            canvas->drawSprite(bitmap, left, top, paint);
+        } break;
+        case DRAW_TEXT: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            SkScalar x = reader.readScalar();
+            SkScalar y = reader.readScalar();
+            canvas->drawText(text.text(), text.length(), x, y, paint);
+        } break;
+        case DRAW_TEXT_TOP_BOTTOM: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            const SkScalar* ptr = (const SkScalar*)reader.skip(4 * sizeof(SkScalar));
+            // ptr[0] == x
+            // ptr[1] == y
+            // ptr[2] == top
+            // ptr[3] == bottom
+            if (!canvas->quickRejectY(ptr[2], ptr[3])) {
+                canvas->drawText(text.text(), text.length(), ptr[0], ptr[1], paint);
+            }
+        } break;
+        case DRAW_TEXT_ON_PATH: {
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            get_text(&reader, &text);
+            const SkPath& path = fPictureData->getPath(reader);
+            SkMatrix matrix;
+            reader.readMatrix(&matrix);
+            canvas->drawTextOnPath(text.text(), text.length(), path, &matrix, paint);
+        } break;
+        case DRAW_VERTICES: {
+            SkAutoTUnref<SkXfermode> xfer;
+            const SkPaint& paint = *fPictureData->getPaint(reader);
+            DrawVertexFlags flags = (DrawVertexFlags)reader.readInt();
+            SkCanvas::VertexMode vmode = (SkCanvas::VertexMode)reader.readInt();
+            int vCount = reader.readInt();
+            const SkPoint* verts = (const SkPoint*)reader.skip(vCount * sizeof(SkPoint));
+            const SkPoint* texs = NULL;
+            const SkColor* colors = NULL;
+            const uint16_t* indices = NULL;
+            int iCount = 0;
+            if (flags & DRAW_VERTICES_HAS_TEXS) {
+                texs = (const SkPoint*)reader.skip(vCount * sizeof(SkPoint));
+            }
+            if (flags & DRAW_VERTICES_HAS_COLORS) {
+                colors = (const SkColor*)reader.skip(vCount * sizeof(SkColor));
+            }
+            if (flags & DRAW_VERTICES_HAS_INDICES) {
+                iCount = reader.readInt();
+                indices = (const uint16_t*)reader.skip(iCount * sizeof(uint16_t));
+            }
+            if (flags & DRAW_VERTICES_HAS_XFER) {
+                int mode = reader.readInt();
+                if (mode < 0 || mode > SkXfermode::kLastMode) {
+                    mode = SkXfermode::kModulate_Mode;
+                }
+                xfer.reset(SkXfermode::Create((SkXfermode::Mode)mode));
+            }
+            canvas->drawVertices(vmode, vCount, verts, texs, colors, xfer, indices, iCount, paint);
+        } break;
+        case RESTORE:
+            canvas->restore();
+            break;
+        case ROTATE:
+            canvas->rotate(reader.readScalar());
+            break;
+        case SAVE:
+            // SKPs with version < 29 also store a SaveFlags param.
+            if (size > 4) {
+                SkASSERT(8 == size);
+                reader.readInt();
+            }
+            canvas->save();
+            break;
+        case SAVE_LAYER: {
+            const SkRect* boundsPtr = get_rect_ptr(reader);
+            const SkPaint* paint = fPictureData->getPaint(reader);
+            canvas->saveLayer(boundsPtr, paint, (SkCanvas::SaveFlags) reader.readInt());
+        } break;
+        case SCALE: {
+            SkScalar sx = reader.readScalar();
+            SkScalar sy = reader.readScalar();
+            canvas->scale(sx, sy);
+        } break;
+        case SET_MATRIX: {
+            SkMatrix matrix;
+            reader.readMatrix(&matrix);
+            matrix.postConcat(initialMatrix);
+            canvas->setMatrix(matrix);
+        } break;
+        case SKEW: {
+            SkScalar sx = reader.readScalar();
+            SkScalar sy = reader.readScalar();
+            canvas->skew(sx, sy);
+        } break;
+        case TRANSLATE: {
+            SkScalar dx = reader.readScalar();
+            SkScalar dy = reader.readScalar();
+            canvas->translate(dx, dy);
+        } break;
+        default:
+            SkASSERT(0);
+        }
+
+#ifdef SK_DEVELOPER
+        this->postDraw(opIndex);
+#endif
+
+        if (it.isValid()) {
+            uint32_t skipTo = it.nextDraw();
+            if (kDrawComplete == skipTo) {
+                break;
+            }
+            reader.setOffset(skipTo);
+        }
+    }
+
+#ifdef SPEW_CLIP_SKIPPING
+    {
+        size_t size = skipRect.fSize + skipRRect.fSize + skipPath.fSize + skipRegion.fSize +
+            skipCull.fSize;
+        SkDebugf("--- Clip skips %d%% rect:%d rrect:%d path:%d rgn:%d cull:%d\n",
+            size * 100 / reader.offset(), skipRect.fCount, skipRRect.fCount,
+            skipPath.fCount, skipRegion.fCount, skipCull.fCount);
+        SkDebugf("--- Total ops: %d\n", opCount);
+    }
+#endif
+    //    this->dumpSize();
+}
+