ui/gfx/path_win_unittest.cc

   1 // Copyright 2014 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/path_win.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/win/scoped_gdi_object.h"
  11 #include "skia/ext/skia_utils_win.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13 #include "third_party/skia/include/core/SkRRect.h"
  14 #include "ui/gfx/path.h"
  15
  16 namespace gfx {
  17
  18 namespace {
  19
  20 // Get rectangles from the |region| and convert them to SkIRect.
  21 std::vector<SkIRect> GetRectsFromHRGN(HRGN region) {
  22   // Determine the size of output buffer required to receive the region.
  23   DWORD bytes_size = GetRegionData(region, 0, NULL);
  24   CHECK_NE((DWORD)0, bytes_size);
  25
  26   // Fetch the Windows RECTs that comprise the region.
  27   std::vector<char> buffer(bytes_size);
  28   LPRGNDATA region_data = reinterpret_cast<LPRGNDATA>(buffer.data());
  29   DWORD result = GetRegionData(region, bytes_size, region_data);
  30   CHECK_EQ(bytes_size, result);
  31
  32   // Pull out the rectangles into a SkIRect vector to return to caller.
  33   const LPRECT rects = reinterpret_cast<LPRECT>(&region_data->Buffer[0]);
  34   std::vector<SkIRect> sk_rects(region_data->rdh.nCount);
  35   std::transform(rects, rects + region_data->rdh.nCount,
  36                  sk_rects.begin(), skia::RECTToSkIRect);
  37
  38   return sk_rects;
  39 }
  40
  41 }  // namespace
  42
  43 // Test that rectangle with round corners stil has round corners after
  44 // converting from SkPath to the HRGN.
  45 TEST(CreateHRGNFromSkPathTest, RoundCornerTest) {
  46   const SkIRect rects[] = {
  47       { 17, 0, 33, 1},
  48       { 12, 1, 38, 2},
  49       { 11, 2, 39, 3},
  50       { 9, 3, 41, 4},
  51       { 8, 4, 42, 5},
  52       { 6, 5, 44, 6},
  53       { 5, 6, 45, 8},
  54       { 4, 8, 46, 9},
  55       { 3, 9, 47, 11},
  56       { 2, 11, 48, 12},
  57       { 1, 12, 49, 17},
  58       { 0, 17, 50, 33},
  59       { 1, 33, 49, 38},
  60       { 2, 38, 48, 39},
  61       { 3, 39, 47, 41},
  62       { 4, 41, 46, 42},
  63       { 5, 42, 45, 44},
  64       { 6, 44, 44, 45},
  65       { 8, 45, 42, 46},
  66       { 9, 46, 41, 47},
  67       { 11, 47, 39, 48},
  68       { 12, 48, 38, 49},
  69       { 17, 49, 33, 50},
  70   };
  71
  72   Path path;
  73   SkRRect rrect;
  74   rrect.setRectXY(SkRect::MakeWH(50, 50), 20, 20);
  75   path.addRRect(rrect);
  76   base::win::ScopedRegion region(CreateHRGNFromSkPath(path));
  77   const std::vector<SkIRect>& region_rects = GetRectsFromHRGN(region);
  78   EXPECT_EQ(arraysize(rects), region_rects.size());
  79   for (size_t i = 0; i < arraysize(rects) && i < region_rects.size(); ++i)
  80     EXPECT_EQ(rects[i], region_rects[i]);
  81 }
  82
  83 // Check that a path enclosing two non-adjacent areas is correctly translated
  84 // to a non-contiguous region.
  85 TEST(CreateHRGNFromSkPathTest, NonContiguousPath) {
  86   const SkIRect rects[] = {
  87       { 0, 0, 50, 50},
  88       { 100, 100, 150, 150},
  89   };
  90
  91   Path path;
  92   for (const SkIRect& rect : rects) {
  93     path.addRect(SkRect::Make(rect));
  94   }
  95   base::win::ScopedRegion region(CreateHRGNFromSkPath(path));
  96   const std::vector<SkIRect>& region_rects = GetRectsFromHRGN(region);
  97   ASSERT_EQ(arraysize(rects), region_rects.size());
  98   for (size_t i = 0; i < arraysize(rects); ++i)
  99     EXPECT_EQ(rects[i], region_rects[i]);
 100 }
 101
 102 // Check that empty region is returned for empty path.
 103 TEST(CreateHRGNFromSkPathTest, EmptyPath) {
 104   Path path;
 105   base::win::ScopedRegion empty_region(::CreateRectRgn(0, 0, 0, 0));
 106   base::win::ScopedRegion region(CreateHRGNFromSkPath(path));
 107   EXPECT_TRUE(::EqualRgn(empty_region, region));
 108 }
 109
 110 }  // namespace gfx
 111