tests/RecordTest.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 "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "src/core/SkRecord.h"
#include "src/core/SkRecords.h"
#include "tests/RecordTestUtils.h"
#include "tests/Test.h"

#include <cstdint>
#include <new>

// Sums the area of any DrawRect command it sees.
class AreaSummer {
public:
    AreaSummer() : fArea(0) {}

    template <typename T> void operator()(const T&) { }

    void operator()(const SkRecords::DrawRect& draw) {
        fArea += (int)(draw.rect.width() * draw.rect.height());
    }

    int area() const { return fArea; }

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

private:
    int fArea;
};

// Scales out the bottom-right corner of any DrawRect command it sees by 2x.
struct Stretch {
    template <typename T> void operator()(T*) {}
    void operator()(SkRecords::DrawRect* draw) {
        draw->rect.fRight *= 2;
        draw->rect.fBottom *= 2;
    }

    void apply(SkRecord* record) {
        for (int i = 0; i < record->count(); i++) {
            record->mutate(i, *this);
        }
    }
};

#define APPEND(record, type, ...) new (record.append<type>()) type{__VA_ARGS__}

// Basic tests for the low-level SkRecord code.
DEF_TEST(Record, r) {
    SkRecord record;

    // Add a simple DrawRect command.
    SkRect rect = SkRect::MakeWH(10, 10);
    SkPaint paint;
    APPEND(record, SkRecords::DrawRect, paint, rect);

    // Its area should be 100.
    AreaSummer summer;
    summer.apply(record);
    REPORTER_ASSERT(r, summer.area() == 100);

    // Scale 2x.
    Stretch stretch;
    stretch.apply(&record);

    // Now its area should be 100 + 400.
    summer.apply(record);
    REPORTER_ASSERT(r, summer.area() == 500);
}

DEF_TEST(Record_defrag, r) {
    SkRecord record;
    APPEND(record, SkRecords::Save);
    APPEND(record, SkRecords::ClipRect);
    APPEND(record, SkRecords::NoOp);
    APPEND(record, SkRecords::DrawRect);
    APPEND(record, SkRecords::NoOp);
    APPEND(record, SkRecords::NoOp);
    APPEND(record, SkRecords::Restore);
    REPORTER_ASSERT(r, record.count() == 7);

    record.defrag();
    REPORTER_ASSERT(r, record.count() == 4);
    assert_type<SkRecords::Save    >(r, record, 0);
    assert_type<SkRecords::ClipRect>(r, record, 1);
    assert_type<SkRecords::DrawRect>(r, record, 2);
    assert_type<SkRecords::Restore >(r, record, 3);
}

#undef APPEND

template <typename T>
static bool is_aligned(const T* p) {
    return (((uintptr_t)p) & (sizeof(T) - 1)) == 0;
}

DEF_TEST(Record_Alignment, r) {
    SkRecord record;
    REPORTER_ASSERT(r, is_aligned(record.alloc<uint8_t>()));
    REPORTER_ASSERT(r, is_aligned(record.alloc<uint16_t>()));
    REPORTER_ASSERT(r, is_aligned(record.alloc<uint32_t>()));
    REPORTER_ASSERT(r, is_aligned(record.alloc<void*>()));

    // It's not clear if we care that 8-byte values are aligned on 32-bit machines.
    if (sizeof(void*) == 8) {
        REPORTER_ASSERT(r, is_aligned(record.alloc<double>()));
        REPORTER_ASSERT(r, is_aligned(record.alloc<uint64_t>()));
    }
}