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 #include "ui/gfx/geometry/rect.h"
  13 #include "ui/gfx/geometry/rect_f.h"
  14 #include "ui/gfx/skia_util.h"
  15
  16 namespace gfx {
  17
  18 class CanvasTest : public testing::Test {
  19  protected:
  20   int GetStringWidth(const char *text) {
  21     return Canvas::GetStringWidth(base::UTF8ToUTF16(text), font_list_);
  22   }
  23
  24   gfx::Size SizeStringInt(const char *text, int width, int line_height) {
  25     base::string16 text16 = base::UTF8ToUTF16(text);
  26     int height = 0;
  27     int flags =
  28         (text16.find('\n') != base::string16::npos) ? Canvas::MULTI_LINE : 0;
  29     Canvas::SizeStringInt(text16, font_list_, &width, &height, line_height,
  30                           flags);
  31     return gfx::Size(width, height);
  32   }
  33
  34  private:
  35   FontList font_list_;
  36 };
  37
  38 TEST_F(CanvasTest, StringWidth) {
  39   EXPECT_GT(GetStringWidth("Test"), 0);
  40 }
  41
  42 TEST_F(CanvasTest, StringWidthEmptyString) {
  43   EXPECT_EQ(0, GetStringWidth(""));
  44 }
  45
  46 TEST_F(CanvasTest, StringSizeEmptyString) {
  47   gfx::Size size = SizeStringInt("", 0, 0);
  48   EXPECT_EQ(0, size.width());
  49   EXPECT_GT(size.height(), 0);
  50 }
  51
  52 // Verifies GetClipBounds() returns the correct value.
  53 TEST_F(CanvasTest, ClipRectWithScaling) {
  54   Canvas canvas(gfx::Size(200, 100), 2.25, true);
  55   canvas.sk_canvas()->clipRect(RectFToSkRect(gfx::RectF(100, 0, 20, 1.7f)));
  56   gfx::Rect clip_rect;
  57   ASSERT_TRUE(canvas.GetClipBounds(&clip_rect));
  58   // Use Contains() rather than Equals() as skia may extend the rect in certain
  59   // directions. None-the-less the clip must contain the region we damaged.
  60   EXPECT_TRUE(clip_rect.Contains(gfx::Rect(100, 0, 20, 2)));
  61 }
  62
  63 // Line height is only supported on Skia.
  64 #if defined(OS_MACOSX) || defined(OS_ANDROID)
  65 #define MAYBE_StringSizeWithLineHeight DISABLED_StringSizeWithLineHeight
  66 #else
  67 #define MAYBE_StringSizeWithLineHeight StringSizeWithLineHeight
  68 #endif
  69
  70 TEST_F(CanvasTest, MAYBE_StringSizeWithLineHeight) {
  71   gfx::Size one_line_size = SizeStringInt("Q", 0, 0);
  72   gfx::Size four_line_size = SizeStringInt("Q\nQ\nQ\nQ", 1000000, 1000);
  73   EXPECT_EQ(one_line_size.width(), four_line_size.width());
  74   EXPECT_EQ(3 * 1000 + one_line_size.height(), four_line_size.height());
  75 }
  76
  77 }  // namespace gfx