chrome/browser/thumbnails/simple_thumbnail_crop_unittest.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/thumbnails/simple_thumbnail_crop.h"

#include "base/strings/stringprintf.h"
#include "chrome/browser/thumbnails/thumbnailing_context.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/test/mock_render_process_host.h"
#include "content/public/test/test_renderer_host.h"
#include "skia/ext/platform_canvas.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/surface/transport_dib.h"

using content::WebContents;
using thumbnails::SimpleThumbnailCrop;

typedef testing::Test SimpleThumbnailCropTest;

TEST_F(SimpleThumbnailCropTest, GetClippedBitmap_TallerThanWide) {
  // The input bitmap is vertically long.
  gfx::Canvas canvas(gfx::Size(40, 90), 1.0f, true);
  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());

  // The desired size is square.
  thumbnails::ClipResult clip_result = thumbnails::CLIP_RESULT_NOT_CLIPPED;
  SkBitmap clipped_bitmap = SimpleThumbnailCrop::GetClippedBitmap(
      bitmap, 10, 10, &clip_result);
  // The clipped bitmap should be square.
  EXPECT_EQ(40, clipped_bitmap.width());
  EXPECT_EQ(40, clipped_bitmap.height());
  // The input was taller than wide.
  EXPECT_EQ(thumbnails::CLIP_RESULT_TALLER_THAN_WIDE, clip_result);
}

TEST_F(SimpleThumbnailCropTest, GetClippedBitmap_WiderThanTall) {
  // The input bitmap is horizontally long.
  gfx::Canvas canvas(gfx::Size(70, 40), 1.0f, true);
  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());

  // The desired size is square.
  thumbnails::ClipResult clip_result = thumbnails::CLIP_RESULT_NOT_CLIPPED;
  SkBitmap clipped_bitmap = SimpleThumbnailCrop::GetClippedBitmap(
      bitmap, 10, 10, &clip_result);
  // The clipped bitmap should be square.
  EXPECT_EQ(40, clipped_bitmap.width());
  EXPECT_EQ(40, clipped_bitmap.height());
  // The input was wider than tall.
  EXPECT_EQ(thumbnails::CLIP_RESULT_WIDER_THAN_TALL, clip_result);
}

TEST_F(SimpleThumbnailCropTest, GetClippedBitmap_TooWiderThanTall) {
  // The input bitmap is horizontally very long.
  gfx::Canvas canvas(gfx::Size(90, 40), 1.0f, true);
  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());

  // The desired size is square.
  thumbnails::ClipResult clip_result = thumbnails::CLIP_RESULT_NOT_CLIPPED;
  SkBitmap clipped_bitmap = SimpleThumbnailCrop::GetClippedBitmap(
      bitmap, 10, 10, &clip_result);
  // The clipped bitmap should be square.
  EXPECT_EQ(40, clipped_bitmap.width());
  EXPECT_EQ(40, clipped_bitmap.height());
  // The input was wider than tall.
  EXPECT_EQ(thumbnails::CLIP_RESULT_MUCH_WIDER_THAN_TALL, clip_result);
}

TEST_F(SimpleThumbnailCropTest, GetClippedBitmap_NotClipped) {
  // The input bitmap is square.
  gfx::Canvas canvas(gfx::Size(40, 40), 1.0f, true);
  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());

  // The desired size is square.
  thumbnails::ClipResult clip_result = thumbnails::CLIP_RESULT_NOT_CLIPPED;
  SkBitmap clipped_bitmap = SimpleThumbnailCrop::GetClippedBitmap(
      bitmap, 10, 10, &clip_result);
  // The clipped bitmap should be square.
  EXPECT_EQ(40, clipped_bitmap.width());
  EXPECT_EQ(40, clipped_bitmap.height());
  // There was no need to clip.
  EXPECT_EQ(thumbnails::CLIP_RESULT_NOT_CLIPPED, clip_result);
}

TEST_F(SimpleThumbnailCropTest, GetClippedBitmap_NonSquareOutput) {
  // The input bitmap is square.
  gfx::Canvas canvas(gfx::Size(40, 40), 1.0f, true);
  SkBitmap bitmap = skia::ReadPixels(canvas.sk_canvas());

  // The desired size is horizontally long.
  thumbnails::ClipResult clip_result = thumbnails::CLIP_RESULT_NOT_CLIPPED;
  SkBitmap clipped_bitmap = SimpleThumbnailCrop::GetClippedBitmap(
      bitmap, 20, 10, &clip_result);
  // The clipped bitmap should have the same aspect ratio of the desired size.
  EXPECT_EQ(40, clipped_bitmap.width());
  EXPECT_EQ(20, clipped_bitmap.height());
  // The input was taller than wide.
  EXPECT_EQ(thumbnails::CLIP_RESULT_TALLER_THAN_WIDE, clip_result);
}

TEST_F(SimpleThumbnailCropTest, GetCanvasCopyInfo) {
  gfx::Size thumbnail_size(200, 120);
  gfx::Size expected_2x_size = gfx::ScaleToFlooredSize(thumbnail_size, 2.0);
  float desired_aspect =
      static_cast<float>(thumbnail_size.width()) / thumbnail_size.height();
  scoped_refptr<thumbnails::ThumbnailingAlgorithm> algorithm(
      new SimpleThumbnailCrop(thumbnail_size));
  gfx::Rect clipping_rect_result;
  gfx::Size target_size_result;

  thumbnails::ClipResult clip_result = algorithm->GetCanvasCopyInfo(
      gfx::Size(400, 210),
      ui::SCALE_FACTOR_200P,
      &clipping_rect_result,
      &target_size_result);
  gfx::Size clipping_size = clipping_rect_result.size();
  float clip_aspect =
      static_cast<float>(clipping_size.width()) / clipping_size.height();
  EXPECT_EQ(thumbnails::CLIP_RESULT_WIDER_THAN_TALL, clip_result);
  EXPECT_EQ(expected_2x_size, target_size_result);
  EXPECT_NEAR(desired_aspect, clip_aspect, 0.01);

  clip_result = algorithm->GetCanvasCopyInfo(
      gfx::Size(600, 200),
      ui::SCALE_FACTOR_200P,
      &clipping_rect_result,
      &target_size_result);
  clipping_size = clipping_rect_result.size();
  clip_aspect =
      static_cast<float>(clipping_size.width()) / clipping_size.height();
  EXPECT_EQ(thumbnails::CLIP_RESULT_MUCH_WIDER_THAN_TALL, clip_result);
  EXPECT_EQ(expected_2x_size, target_size_result);
  EXPECT_NEAR(desired_aspect, clip_aspect, 0.01);

  clip_result = algorithm->GetCanvasCopyInfo(
      gfx::Size(300, 600),
      ui::SCALE_FACTOR_200P,
      &clipping_rect_result,
      &target_size_result);
  clipping_size = clipping_rect_result.size();
  clip_aspect =
      static_cast<float>(clipping_size.width()) / clipping_size.height();
  EXPECT_EQ(thumbnails::CLIP_RESULT_TALLER_THAN_WIDE, clip_result);
  EXPECT_EQ(expected_2x_size, target_size_result);
  EXPECT_NEAR(desired_aspect, clip_aspect, 0.01);

  clip_result = algorithm->GetCanvasCopyInfo(
      gfx::Size(200, 100),
      ui::SCALE_FACTOR_200P,
      &clipping_rect_result,
      &target_size_result);
  EXPECT_EQ(thumbnails::CLIP_RESULT_SOURCE_IS_SMALLER, clip_result);
  EXPECT_EQ(expected_2x_size, target_size_result);
}

TEST_F(SimpleThumbnailCropTest, GetCanvasCopyInfoDifferentScales) {
  gfx::Size thumbnail_size(200, 120);
  scoped_refptr<thumbnails::ThumbnailingAlgorithm> algorithm(
      new SimpleThumbnailCrop(thumbnail_size));

  gfx::Rect clipping_rect_result;
  gfx::Size target_size_result;

  gfx::Size expected_2x_size = gfx::ScaleToFlooredSize(thumbnail_size, 2.0);

  // Test at 1x scale. Expect a 2x thumbnail (we do this for quality).
  algorithm->GetCanvasCopyInfo(gfx::Size(400, 210), ui::SCALE_FACTOR_100P,
                               &clipping_rect_result, &target_size_result);
  EXPECT_EQ(expected_2x_size, target_size_result);

  // Test at 2x scale.
  algorithm->GetCanvasCopyInfo(gfx::Size(400, 210), ui::SCALE_FACTOR_200P,
                               &clipping_rect_result, &target_size_result);
  EXPECT_EQ(expected_2x_size, target_size_result);

  // Test at 3x scale.
  gfx::Size expected_3x_size = gfx::ScaleToFlooredSize(thumbnail_size, 3.0);
  algorithm->GetCanvasCopyInfo(gfx::Size(400, 210), ui::SCALE_FACTOR_300P,
                               &clipping_rect_result, &target_size_result);
  EXPECT_EQ(expected_3x_size, target_size_result);
}

TEST_F(SimpleThumbnailCropTest, GetClippingRect) {
  const gfx::Size desired_size(300, 200);
  thumbnails::ClipResult clip_result;
  // Try out 'microsource'.
  gfx::Rect clip_rect = SimpleThumbnailCrop::GetClippingRect(
      gfx::Size(300, 199), desired_size, &clip_result);
  EXPECT_EQ(thumbnails::CLIP_RESULT_SOURCE_IS_SMALLER, clip_result);
  EXPECT_EQ(gfx::Point(0, 0).ToString(), clip_rect.origin().ToString());
  EXPECT_EQ(desired_size.ToString(), clip_rect.size().ToString());

  // Portrait source.
  clip_rect = SimpleThumbnailCrop::GetClippingRect(
      gfx::Size(500, 1200), desired_size, &clip_result);
  EXPECT_EQ(thumbnails::CLIP_RESULT_TALLER_THAN_WIDE, clip_result);
  EXPECT_EQ(gfx::Point(0, 0).ToString(), clip_rect.origin().ToString());
  EXPECT_EQ(500, clip_rect.width());
  EXPECT_GE(1200, clip_rect.height());

  clip_rect = SimpleThumbnailCrop::GetClippingRect(
      gfx::Size(2000, 800), desired_size, &clip_result);
  EXPECT_TRUE(clip_result == thumbnails::CLIP_RESULT_WIDER_THAN_TALL ||
              clip_result == thumbnails::CLIP_RESULT_MUCH_WIDER_THAN_TALL);
  EXPECT_EQ(0, clip_rect.y());
  EXPECT_LT(0, clip_rect.x());
  EXPECT_GE(2000, clip_rect.width());
  EXPECT_EQ(800, clip_rect.height());

  clip_rect = SimpleThumbnailCrop::GetClippingRect(
      gfx::Size(900, 600), desired_size, &clip_result);
  EXPECT_EQ(thumbnails::CLIP_RESULT_NOT_CLIPPED, clip_result);
  EXPECT_EQ(gfx::Point(0, 0).ToString(), clip_rect.origin().ToString());
  EXPECT_EQ(gfx::Size(900, 600).ToString(), clip_rect.size().ToString());
}