ui/gfx/canvas_unittest.cc

   1 // Copyright (c) 2012 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 <limits>
   8
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11 #include "ui/gfx/font_list.h"
  12
  13 namespace gfx {
  14
  15 class CanvasTest : public testing::Test {
  16  protected:
  17   int GetStringWidth(const char *text) {
  18     return Canvas::GetStringWidth(base::UTF8ToUTF16(text), font_list_);
  19   }
  20
  21   gfx::Size SizeStringInt(const char *text, int width, int line_height) {
  22     base::string16 text16 = base::UTF8ToUTF16(text);
  23     int height = 0;
  24     int flags =
  25         (text16.find('\n') != base::string16::npos) ? Canvas::MULTI_LINE : 0;
  26     Canvas::SizeStringInt(text16, font_list_, &width, &height, line_height,
  27                           flags);
  28     return gfx::Size(width, height);
  29   }
  30
  31  private:
  32   FontList font_list_;
  33 };
  34
  35 TEST_F(CanvasTest, StringWidth) {
  36   EXPECT_GT(GetStringWidth("Test"), 0);
  37 }
  38
  39 TEST_F(CanvasTest, StringWidthEmptyString) {
  40   EXPECT_EQ(0, GetStringWidth(""));
  41 }
  42
  43 TEST_F(CanvasTest, StringSizeEmptyString) {
  44   gfx::Size size = SizeStringInt("", 0, 0);
  45   EXPECT_EQ(0, size.width());
  46   EXPECT_GT(size.height(), 0);
  47 }
  48
  49 // Line height is only supported on Skia.
  50 #if defined(OS_MACOSX) || defined(OS_ANDROID)
  51 #define MAYBE_StringSizeWithLineHeight DISABLED_StringSizeWithLineHeight
  52 #else
  53 #define MAYBE_StringSizeWithLineHeight StringSizeWithLineHeight
  54 #endif
  55
  56 TEST_F(CanvasTest, MAYBE_StringSizeWithLineHeight) {
  57   gfx::Size one_line_size = SizeStringInt("Q", 0, 0);
  58   gfx::Size four_line_size = SizeStringInt("Q\nQ\nQ\nQ", 1000000, 1000);
  59   EXPECT_EQ(one_line_size.width(), four_line_size.width());
  60   EXPECT_EQ(3 * 1000 + one_line_size.height(), four_line_size.height());
  61 }
  62
  63 }  // namespace gfx