ShapeDetection: Get bounding box in the line of Text on Windows 10

The OcrLine[1] has no BoundingRect properties, so the result of bounding box
need to be calculated by the words in the current line of text.

[1] https://docs.microsoft.com/en-us/uwp/api/windows.media.ocr.ocrline

BUG=866019

Cq-Include-Trybots: luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win10_chromium_x64_rel_ng
Change-Id: I7bcbd527b55b685f03a8c1783ca8c7bf7b090ee2
Reviewed-on: https://chromium-review.googlesource.com/1156054
Commit-Queue: Junwei Fu <junwei.fu@intel.com>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581499}

services/shape_detection/text_detection_impl_win.cc

@@ -15,6 +15,7 @@
 #include "base/win/windows_version.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/shape_detection/text_detection_impl.h"
+#include "ui/gfx/geometry/rect_f.h"
 
 namespace shape_detection {
 
@@ -23,6 +24,8 @@ using ABI::Windows::Globalization::ILanguageFactory;
 using ABI::Windows::Media::Ocr::IOcrEngineStatics;
 using ABI::Windows::Media::Ocr::IOcrLine;
 using ABI::Windows::Media::Ocr::OcrLine;
+using ABI::Windows::Media::Ocr::IOcrWord;
+using ABI::Windows::Media::Ocr::OcrWord;
 using base::win::GetActivationFactory;
 using base::win::ScopedHString;
 
@@ -200,7 +203,34 @@ TextDetectionImplWin::BuildTextDetectionResult(
     if (FAILED(hr))
       break;
 
+    // Gets bounding box with the words detected in the current line of Text.
+    Microsoft::WRL::ComPtr<IVectorView<OcrWord*>> ocr_words;
+    hr = line->get_Words(ocr_words.GetAddressOf());
+    if (FAILED(hr))
+      break;
+
+    uint32_t words_count;
+    hr = ocr_words->get_Size(&words_count);
+    if (FAILED(hr))
+      break;
+
     auto result = shape_detection::mojom::TextDetectionResult::New();
+    for (uint32_t i = 0; i < words_count; ++i) {
+      Microsoft::WRL::ComPtr<IOcrWord> word;
+      hr = ocr_words->GetAt(i, &word);
+      if (FAILED(hr))
+        break;
+
+      ABI::Windows::Foundation::Rect bounds;
+      hr = word->get_BoundingRect(&bounds);
+      if (FAILED(hr))
+        break;
+
+      result->bounding_box = gfx::UnionRects(
+          result->bounding_box,
+          gfx::RectF(bounds.X, bounds.Y, bounds.Width, bounds.Height));
+    }
+
     result->raw_value = ScopedHString(text).GetAsUTF8();
     results.push_back(std::move(result));
   }

services/shape_detection/text_detection_impl_win_unittest.cc

@@ -89,7 +89,9 @@ TEST_F(TextDetectionImplWinTest, ScanOnce) {
   run_loop.Run();
   ASSERT_EQ(2u, results.size());
   EXPECT_EQ("The Chromium Project website is:", results[0]->raw_value);
+  EXPECT_EQ(gfx::RectF(51, 38, 272, 17), results[0]->bounding_box);
   EXPECT_EQ("https://www.chromium.org", results[1]->raw_value);
+  EXPECT_EQ(gfx::RectF(51, 63, 209, 17), results[1]->bounding_box);
 }
 
 }  // namespace shape_detection