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      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
     78