skia2/tests/RecorderTest.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 "Test.h"

#include "SkPictureRecorder.h"
#include "SkRecord.h"
#include "SkRecorder.h"
#include "SkRecords.h"
#include "SkShader.h"

#define COUNT(T) + 1
static const int kRecordTypes = SK_RECORD_TYPES(COUNT);
#undef COUNT

// Tallies the types of commands it sees into a histogram.
class Tally {
public:
    Tally() { sk_bzero(&fHistogram, sizeof(fHistogram)); }

    template <typename T>
    void operator()(const T&) { ++fHistogram[T::kType]; }

    template <typename T>
    int count() const { return fHistogram[T::kType]; }

    void apply(const SkRecord& record) {
        for (unsigned i = 0; i < record.count(); i++) {
            record.visit<void>(i, *this);
        }
    }

private:
    int fHistogram[kRecordTypes];
};

DEF_TEST(Recorder, r) {
    SkRecord record;
    SkRecorder recorder(&record, 1920, 1080);

    recorder.drawRect(SkRect::MakeWH(10, 10), SkPaint());

    Tally tally;
    tally.apply(record);
    REPORTER_ASSERT(r, 1 == tally.count<SkRecords::DrawRect>());
}

// All of Skia will work fine without support for comment groups, but
// Chrome's inspector can break.  This serves as a simple regression test.
DEF_TEST(Recorder_CommentGroups, r) {
    SkRecord record;
    SkRecorder recorder(&record, 1920, 1080);

    recorder.beginCommentGroup("test");
        recorder.addComment("foo", "bar");
        recorder.addComment("baz", "quux");
    recorder.endCommentGroup();

    Tally tally;
    tally.apply(record);

    REPORTER_ASSERT(r, 1 == tally.count<SkRecords::BeginCommentGroup>());
    REPORTER_ASSERT(r, 2 == tally.count<SkRecords::AddComment>());
    REPORTER_ASSERT(r, 1 == tally.count<SkRecords::EndCommentGroup>());
}

// DrawData is similar to comment groups.  It doesn't affect drawing, but
// it's a pass-through we provide to the client.  Again, a simple reg. test.
DEF_TEST(Recorder_DrawData, r) {
    SkRecord record;
    SkRecorder recorder(&record, 100, 100);

    const char* data = "This sure is some data, eh?";
    recorder.drawData(data, strlen(data));

    Tally tally;
    tally.apply(record);
    REPORTER_ASSERT(r, 1 == tally.count<SkRecords::DrawData>());
}

// Regression test for leaking refs held by optional arguments.
DEF_TEST(Recorder_RefLeaking, r) {
    // We use SaveLayer to test:
    //   - its SkRect argument is optional and SkRect is POD.  Just testing that that works.
    //   - its SkPaint argument is optional and SkPaint is not POD.  The bug was here.

    SkRect bounds = SkRect::MakeWH(320, 240);
    SkPaint paint;
    paint.setShader(SkShader::CreateEmptyShader())->unref();

    REPORTER_ASSERT(r, paint.getShader()->unique());
    {
        SkRecord record;
        SkRecorder recorder(&record, 1920, 1080);
        recorder.saveLayer(&bounds, &paint);
        REPORTER_ASSERT(r, !paint.getShader()->unique());
    }
    REPORTER_ASSERT(r, paint.getShader()->unique());
}

DEF_TEST(Recorder_RefPictures, r) {
    SkAutoTUnref<SkPicture> pic;

    {
        SkPictureRecorder pr;
        SkCanvas* canvas = pr.beginRecording(100, 100);
        canvas->drawColor(SK_ColorRED);
        pic.reset(pr.endRecording());
    }
    REPORTER_ASSERT(r, pic->unique());

    {
        SkRecord record;
        SkRecorder recorder(&record, 100, 100);
        recorder.drawPicture(pic);
        // the recorder should now also be an owner
        REPORTER_ASSERT(r, !pic->unique());
    }
    // the recorder destructor should have released us (back to unique)
    REPORTER_ASSERT(r, pic->unique());
}

DEF_TEST(Recorder_IsDrawingToLayer, r) {
    SkRecord record;
    SkRecorder recorder(&record, 100, 100);

    // We'll save, saveLayer, save, and saveLayer, then restore them all,
    // checking that isDrawingToLayer() is correct at each step.

    REPORTER_ASSERT(r, !recorder.isDrawingToLayer());
    recorder.save();
        REPORTER_ASSERT(r, !recorder.isDrawingToLayer());
        recorder.saveLayer(NULL, NULL);
            REPORTER_ASSERT(r, recorder.isDrawingToLayer());
            recorder.save();
                REPORTER_ASSERT(r, recorder.isDrawingToLayer());
                recorder.saveLayer(NULL, NULL);
                    REPORTER_ASSERT(r, recorder.isDrawingToLayer());
                recorder.restore();
                REPORTER_ASSERT(r, recorder.isDrawingToLayer());
            recorder.restore();
            REPORTER_ASSERT(r, recorder.isDrawingToLayer());
        recorder.restore();
        REPORTER_ASSERT(r, !recorder.isDrawingToLayer());
    recorder.restore();
    REPORTER_ASSERT(r, !recorder.isDrawingToLayer());
}