gfx/skia/skia/include/private/SkMiniRecorder.h
author Wes Kocher <wkocher@mozilla.com>
Wed, 10 May 2017 10:01:18 -0700
changeset 407965 ce2218406119c36a551e3faea4e192186ee46cc5
parent 407937 af6f19870b2a00759ac1d83dedc3db57213abfee
child 408167 0ded74baeaf23d7985401fe9bbabdb3d9385ac22
permissions -rw-r--r--
Backed out 9 changesets (bug 1340627) for graphical glitches a=backout Backed out changeset 0b1371055c7f (bug 1340627) Backed out changeset f152be1fadb7 (bug 1340627) Backed out changeset c691e2ab6a0c (bug 1340627) Backed out changeset 3cb4bceb8d79 (bug 1340627) Backed out changeset 026aadd76d06 (bug 1340627) Backed out changeset fdbd5d281287 (bug 1340627) Backed out changeset 75fb0d9858a9 (bug 1340627) Backed out changeset 0d4ec7d38a00 (bug 1340627) Backed out changeset af6f19870b2a (bug 1340627) MozReview-Commit-ID: 9dHr7xMZezY

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkMiniRecorder_DEFINED
#define SkMiniRecorder_DEFINED

#include "SkRecords.h"
#include "SkScalar.h"
#include "SkTypes.h"
class SkCanvas;

// Records small pictures, but only a limited subset of the canvas API, and may fail.
class SkMiniRecorder : SkNoncopyable {
public:
    SkMiniRecorder();
    ~SkMiniRecorder();

    // Try to record an op.  Returns false on failure.
    bool drawPath(const SkPath&, const SkPaint&);
    bool drawRect(const SkRect&, const SkPaint&);
    bool drawTextBlob(const SkTextBlob*, SkScalar x, SkScalar y, const SkPaint&);

    // Detach anything we've recorded as a picture, resetting this SkMiniRecorder.
    sk_sp<SkPicture> detachAsPicture(const SkRect& cull);

    // Flush anything we've recorded to the canvas, resetting this SkMiniRecorder.
    // This is logically the same as but rather more efficient than:
    //    SkAutoTUnref<SkPicture> pic(this->detachAsPicture(SkRect::MakeEmpty()));
    //    pic->playback(canvas);
    void flushAndReset(SkCanvas*);

private:
    enum class State {
        kEmpty,
        kDrawPath,
        kDrawRect,
        kDrawTextBlob,
    };

    State fState;

    template <size_t A, size_t B>
    struct Max { static const size_t val = A > B ? A : B; };

    static const size_t kInlineStorage =
        Max<sizeof(SkRecords::DrawPath),
        Max<sizeof(SkRecords::DrawRect),
            sizeof(SkRecords::DrawTextBlob)>::val>::val;
    SkAlignedSStorage<kInlineStorage> fBuffer;
};

#endif//SkMiniRecorder_DEFINED