1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/gfx/canvas.h"
6
7#include <cmath>
8
9#import <Cocoa/Cocoa.h>
10
11#include "base/strings/utf_string_conversions.h"
12#include "base/strings/sys_string_conversions.h"
13#include "testing/gtest/include/gtest/gtest.h"
14#include "ui/gfx/font.h"
15#include "ui/gfx/font_list.h"
16
17namespace gfx {
18
19namespace {
20
21// Returns the pixel width of the string via calling the native method
22// -sizeWithAttributes.
23float GetStringNativeWidth(const base::string16& text,
24                           const FontList& font_list) {
25  NSFont* native_font = font_list.GetPrimaryFont().GetNativeFont();
26  NSString* ns_string = base::SysUTF16ToNSString(text);
27  NSDictionary* attributes =
28      [NSDictionary dictionaryWithObject:native_font
29                                  forKey:NSFontAttributeName];
30  return [ns_string sizeWithAttributes:attributes].width;
31}
32
33}  // namespace
34
35class CanvasTestMac : public testing::Test {
36 protected:
37  // Compare the size returned by Canvas::SizeStringInt to the size generated
38  // by the platform-specific version in CanvasMac_SizeStringInt. Will generate
39  // expectation failure on any mismatch. Only works for single-line text
40  // without specified line height, since that is all the platform
41  // implementation supports.
42  void CompareSizes(const char* text) {
43    const float kReallyLargeNumber = 12345678;
44    FontList font_list(font_);
45    base::string16 text16 = base::UTF8ToUTF16(text);
46
47    float mac_width = GetStringNativeWidth(text16, font_list);
48    int mac_height = font_list.GetHeight();
49
50    float canvas_width = kReallyLargeNumber;
51    float canvas_height = kReallyLargeNumber;
52    Canvas::SizeStringFloat(
53        text16, font_list, &canvas_width, &canvas_height, 0, 0);
54
55    EXPECT_NE(kReallyLargeNumber, mac_width) << "no width for " << text;
56    EXPECT_NE(kReallyLargeNumber, mac_height) << "no height for " << text;
57    EXPECT_EQ(mac_width, canvas_width) << " width for " << text;
58    // FontList::GetHeight returns a truncated height.
59    EXPECT_EQ(mac_height,
60              static_cast<int>(canvas_height)) << " height for " << text;
61  }
62
63 private:
64  Font font_;
65};
66
67 // Tests that Canvas' SizeStringFloat yields result consistent with a native
68 // implementation.
69 TEST_F(CanvasTestMac, StringSizeIdenticalForSkia) {
70  CompareSizes("");
71  CompareSizes("Foo");
72  CompareSizes("Longword");
73  CompareSizes("This is a complete sentence.");
74}
75
76TEST_F(CanvasTestMac, FractionalWidth) {
77  const float kReallyLargeNumber = 12345678;
78  float width = kReallyLargeNumber;
79  float height = kReallyLargeNumber;
80
81  FontList font_list;
82  Canvas::SizeStringFloat(
83      base::UTF8ToUTF16("Test"), font_list, &width, &height, 0, 0);
84
85  EXPECT_GT(width, static_cast<int>(width));
86}
87
88}  // namespace gfx
89