sousa-gecko/gfx/tests/gtest/gfxSurfaceRefCountTest.cpp

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <stdio.h>

#include "cairo.h"
#include "gfxASurface.h"
#include "gfxImageSurface.h"
#include "gtest/gtest.h"
#include "nsISupportsUtils.h"  // for NS_ADDREF

static int GetASurfaceRefCount(gfxASurface* s) {
  NS_ADDREF(s);
  return s->Release();
}

static int CheckInt(int value, int expected) {
  if (value != expected) {
    fprintf(stderr, "Expected %d got %d\n", expected, value);
    return 1;
  }

  return 0;
}

static int CheckPointer(void* value, void* expected) {
  if (value != expected) {
    fprintf(stderr, "Expected %p got %p\n", expected, value);
    return 1;
  }

  return 0;
}

static cairo_user_data_key_t destruction_key;
static void SurfaceDestroyNotifier(void* data) { *(int*)data = 1; }

static int TestNewSurface() {
  int failures = 0;
  int destroyed = 0;

  RefPtr<gfxASurface> s =
      new gfxImageSurface(mozilla::gfx::IntSize(10, 10),
                          mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32);
  cairo_surface_t* cs = s->CairoSurface();

  cairo_surface_set_user_data(cs, &destruction_key, &destroyed,
                              SurfaceDestroyNotifier);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 1);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 1);
  failures += CheckInt(destroyed, 0);

  cairo_surface_reference(cs);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 2);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 2);
  failures += CheckInt(destroyed, 0);

  gfxASurface* savedWrapper = s.get();

  s = nullptr;

  failures += CheckInt(cairo_surface_get_reference_count(cs), 1);
  failures += CheckInt(destroyed, 0);

  s = gfxASurface::Wrap(cs);

  failures += CheckPointer(s.get(), savedWrapper);
  failures += CheckInt(GetASurfaceRefCount(s.get()), 2);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 2);
  failures += CheckInt(destroyed, 0);

  cairo_surface_destroy(cs);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 1);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 1);
  failures += CheckInt(destroyed, 0);

  s = nullptr;

  failures += CheckInt(destroyed, 1);

  return failures;
}

static int TestExistingSurface() {
  int failures = 0;
  int destroyed = 0;

  cairo_surface_t* cs = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 10, 10);

  cairo_surface_set_user_data(cs, &destruction_key, &destroyed,
                              SurfaceDestroyNotifier);

  failures += CheckInt(cairo_surface_get_reference_count(cs), 1);
  failures += CheckInt(destroyed, 0);

  RefPtr<gfxASurface> s = gfxASurface::Wrap(cs);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 2);

  cairo_surface_reference(cs);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 3);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 3);
  failures += CheckInt(destroyed, 0);

  gfxASurface* savedWrapper = s.get();

  s = nullptr;

  failures += CheckInt(cairo_surface_get_reference_count(cs), 2);
  failures += CheckInt(destroyed, 0);

  s = gfxASurface::Wrap(cs);

  failures += CheckPointer(s.get(), savedWrapper);
  failures += CheckInt(GetASurfaceRefCount(s.get()), 3);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 3);
  failures += CheckInt(destroyed, 0);

  cairo_surface_destroy(cs);

  failures += CheckInt(GetASurfaceRefCount(s.get()), 2);
  failures += CheckInt(cairo_surface_get_reference_count(cs), 2);
  failures += CheckInt(destroyed, 0);

  s = nullptr;

  failures += CheckInt(cairo_surface_get_reference_count(cs), 1);
  failures += CheckInt(destroyed, 0);

  cairo_surface_destroy(cs);

  failures += CheckInt(destroyed, 1);

  return failures;
}

TEST(Gfx, SurfaceRefCount)
{
  int fail;

  fail = TestNewSurface();
  EXPECT_TRUE(fail == 0) << "TestNewSurface: " << fail << " failures";
  fail = TestExistingSurface();
  EXPECT_TRUE(fail == 0) << "TestExistingSurface: " << fail << " failures";
}