adding baseline options for super/sub scripting

ui/gfx/render_text_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/render_text.h"
 
 #include <algorithm>
 
 #include "base/format_macros.h"
 #include "base/i18n/break_iterator.h"
@@ skipping 145 matching lines @@
     internal::SkiaTextRenderer::DrawDecorations(
         x, y, width, underline, strike, diagonal_strike);
   }
 
   std::vector<TextLog> text_log_;
   std::vector<DecorationLog> decoration_log_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSkiaTextRenderer);
 };
 
+// Given a buffer to test against, this can be used to test various areas of the
+// rectangular buffer against a specific color value.
+class TestRectangleBuffer {
+ public:
+  TestRectangleBuffer(const wchar_t* string,
+                      const SkColor* buffer,
+                      uint32_t stride,
+                      uint32_t row_count)
+      : string_(string),
+        buffer_(buffer),
+        stride_(stride),
+        row_count_(row_count) {}
+
+  // Test if any values in the rectangular area are anything other than |color|.
+  void EnsureSolidRect(SkColor color,
+                       int left,
+                       int top,
+                       int width,
+                       int height) const {
+    ASSERT_LT(top, row_count_) << string_;
+    ASSERT_LE(top + height, row_count_) << string_;
+    ASSERT_LT(left, stride_) << string_;
+    ASSERT_LE(left + width, stride_) << string_ << ", left " << left
+                                     << ", width " << width << ", stride_ "
+                                     << stride_;
+    for (int y = top; y < top + height; ++y) {
+      for (int x = left; x < left + width; ++x) {
+        SkColor color = buffer_[x + y * stride_];
+        EXPECT_EQ(SK_ColorWHITE, color) << string_ << " at " << x << ", " << y;
+      }
+    }
+  }
+
+ private:
+  const wchar_t* string_;
+  const SkColor* buffer_;
+  int stride_;
+  int row_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestRectangleBuffer);
+};
+
 }  // namespace
 
 class RenderTextTest : public testing::Test {
 };
 
 TEST_F(RenderTextTest, DefaultStyle) {
   // Check the default styles applied to new instances and adjusted text.
   scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
   EXPECT_TRUE(render_text->text().empty());
   const wchar_t* const cases[] = { kWeak, kLtr, L"Hello", kRtl, L"", L"" };
   for (size_t i = 0; i < arraysize(cases); ++i) {
     EXPECT_TRUE(render_text->colors().EqualsValueForTesting(SK_ColorBLACK));
+    EXPECT_TRUE(
+        render_text->baselines().EqualsValueForTesting(NORMAL_BASELINE));
     for (size_t style = 0; style < NUM_TEXT_STYLES; ++style)
       EXPECT_TRUE(render_text->styles()[style].EqualsValueForTesting(false));
     render_text->SetText(WideToUTF16(cases[i]));
   }
 }
 
 TEST_F(RenderTextTest, SetColorAndStyle) {
   // Ensure custom default styles persist across setting and clearing text.
   scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
   const SkColor color = SK_ColorRED;
   render_text->SetColor(color);
+  render_text->SetBaselineStyle(SUPERSCRIPT);
   render_text->SetStyle(BOLD, true);
   render_text->SetStyle(UNDERLINE, false);
   const wchar_t* const cases[] = { kWeak, kLtr, L"Hello", kRtl, L"", L"" };
   for (size_t i = 0; i < arraysize(cases); ++i) {
     EXPECT_TRUE(render_text->colors().EqualsValueForTesting(color));
+    EXPECT_TRUE(render_text->baselines().EqualsValueForTesting(SUPERSCRIPT));
     EXPECT_TRUE(render_text->styles()[BOLD].EqualsValueForTesting(true));
     EXPECT_TRUE(render_text->styles()[UNDERLINE].EqualsValueForTesting(false));
     render_text->SetText(WideToUTF16(cases[i]));
 
     // Ensure custom default styles can be applied after text has been set.
     if (i == 1)
       render_text->SetStyle(STRIKE, true);
     if (i >= 1)
       EXPECT_TRUE(render_text->styles()[STRIKE].EqualsValueForTesting(true));
   }
 }
 
 TEST_F(RenderTextTest, ApplyColorAndStyle) {
   scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
   render_text->SetText(ASCIIToUTF16("012345678"));
 
   // Apply a ranged color and style and check the resulting breaks.
   render_text->ApplyColor(SK_ColorRED, Range(1, 4));
+  render_text->ApplyBaselineStyle(SUPERIOR, Range(2, 4));
   render_text->ApplyStyle(BOLD, true, Range(2, 5));
   std::vector<std::pair<size_t, SkColor> > expected_color;
   expected_color.push_back(std::pair<size_t, SkColor>(0, SK_ColorBLACK));
   expected_color.push_back(std::pair<size_t, SkColor>(1, SK_ColorRED));
   expected_color.push_back(std::pair<size_t, SkColor>(4, SK_ColorBLACK));
   EXPECT_TRUE(render_text->colors().EqualsForTesting(expected_color));
+  std::vector<std::pair<size_t, BaselineStyle>> expected_baseline_style;
+  expected_baseline_style.push_back(
+      std::pair<size_t, BaselineStyle>(0, NORMAL_BASELINE));
+  expected_baseline_style.push_back(
+      std::pair<size_t, BaselineStyle>(2, SUPERIOR));
+  expected_baseline_style.push_back(
+      std::pair<size_t, BaselineStyle>(4, NORMAL_BASELINE));
+  EXPECT_TRUE(
+      render_text->baselines().EqualsForTesting(expected_baseline_style));
   std::vector<std::pair<size_t, bool> > expected_style;
   expected_style.push_back(std::pair<size_t, bool>(0, false));
   expected_style.push_back(std::pair<size_t, bool>(2, true));
   expected_style.push_back(std::pair<size_t, bool>(5, false));
   EXPECT_TRUE(render_text->styles()[BOLD].EqualsForTesting(expected_style));
 
-  // Ensure setting a color and style overrides the ranged colors and styles.
+  // Ensure setting a color, baseline, and style overrides the ranged colors,
+  // baseline, and styles.
   render_text->SetColor(SK_ColorBLUE);
   EXPECT_TRUE(render_text->colors().EqualsValueForTesting(SK_ColorBLUE));
+  render_text->SetBaselineStyle(SUBSCRIPT);
+  EXPECT_TRUE(render_text->baselines().EqualsValueForTesting(SUBSCRIPT));
   render_text->SetStyle(BOLD, false);
   EXPECT_TRUE(render_text->styles()[BOLD].EqualsValueForTesting(false));
 
-  // Apply a color and style over the text end and check the resulting breaks.
-  // (INT_MAX should be used instead of the text length for the range end)
+  // Apply a color, baseline, and style over the text end and check the
+  // resulting breaks (INT_MAX should be used instead of the text length for
+  // the range end)
   const size_t text_length = render_text->text().length();
   render_text->ApplyColor(SK_ColorRED, Range(0, text_length));
+  render_text->ApplyBaselineStyle(SUPERIOR, Range(0, text_length));
   render_text->ApplyStyle(BOLD, true, Range(2, text_length));
   std::vector<std::pair<size_t, SkColor> > expected_color_end;
   expected_color_end.push_back(std::pair<size_t, SkColor>(0, SK_ColorRED));
   EXPECT_TRUE(render_text->colors().EqualsForTesting(expected_color_end));
+  std::vector<std::pair<size_t, BaselineStyle>> expected_baseline_end;
+  expected_baseline_end.push_back(
+      std::pair<size_t, BaselineStyle>(0, SUPERIOR));
+  EXPECT_TRUE(render_text->baselines().EqualsForTesting(expected_baseline_end));
   std::vector<std::pair<size_t, bool> > expected_style_end;
   expected_style_end.push_back(std::pair<size_t, bool>(0, false));
   expected_style_end.push_back(std::pair<size_t, bool>(2, true));
   EXPECT_TRUE(render_text->styles()[BOLD].EqualsForTesting(expected_style_end));
 
   // Ensure ranged values adjust to accommodate text length changes.
   render_text->ApplyStyle(ITALIC, true, Range(0, 2));
   render_text->ApplyStyle(ITALIC, true, Range(3, 6));
   render_text->ApplyStyle(ITALIC, true, Range(7, text_length));
   std::vector<std::pair<size_t, bool> > expected_italic;
@@ skipping 2315 matching lines @@
   // Korean character "han".
   render_text.SetText(WideToUTF16(L"\xd55c"));
   render_text.EnsureLayout();
   internal::TextRunList* run_list = render_text.GetRunList();
   ASSERT_EQ(1U, run_list->size());
   EXPECT_EQ(0U, run_list->runs()[0]->CountMissingGlyphs());
 }
 #endif  // defined(OS_WIN)
 
 // Ensure that the width reported by RenderText is sufficient for drawing. Draws
-// to a canvas and checks whether any pixel beyond the width is colored.
+// to a canvas and checks whether any pixel beyond the bounding rectangle is
+// colored.
 TEST_F(RenderTextTest, TextDoesntClip) {
-  const wchar_t* kTestStrings[] = { L"Save", L"Remove", L"TEST", L"W", L"WWW" };
+  const wchar_t* kTestStrings[] = {
+      L"            ",
+      // TODO(mukai): Underscores draw outside GetStringSize; crbug.com/459812.
+      // L"TEST_______",
+      L"TEST some stuff",
+      L"WWWWWWWWWW",
+      L"gAXAXAXAXAXAXA",
+      // TODO(mukai): A-Ring draws outside GetStringSize; crbug.com/459812.
+      // L"g\x00C5X\x00C5X\x00C5X\x00C5X\x00C5X\x00C5X\x00C5",
+      L"\x0647\x0654\x0647\x0654\x0647\x0654\x0647\x0654\x0645\x0631\x062D"
+      L"\x0628\x0627"};
   const Size kCanvasSize(300, 50);
-  const int kTestWidth = 10;
+  const int kTestSize = 10;
 
   skia::RefPtr<SkSurface> surface = skia::AdoptRef(
       SkSurface::NewRasterN32Premul(kCanvasSize.width(), kCanvasSize.height()));
   scoped_ptr<Canvas> canvas(
       Canvas::CreateCanvasWithoutScaling(surface->getCanvas(), 1.0f));
   scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
-  render_text->SetDisplayRect(Rect(kCanvasSize));
-  render_text->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  render_text->SetHorizontalAlignment(ALIGN_LEFT);
   render_text->SetColor(SK_ColorBLACK);
 
   for (auto string : kTestStrings) {
     surface->getCanvas()->clear(SK_ColorWHITE);
     render_text->SetText(WideToUTF16(string));
+    const Size string_size = render_text->GetStringSize();
+    render_text->ApplyBaselineStyle(SUPERSCRIPT, Range(1, 2));
+    render_text->ApplyBaselineStyle(SUPERIOR, Range(3, 4));
+    render_text->ApplyBaselineStyle(INFERIOR, Range(5, 6));
+    render_text->ApplyBaselineStyle(SUBSCRIPT, Range(7, 8));
     render_text->SetStyle(BOLD, true);
+    render_text->SetDisplayRect(
+        Rect(kTestSize, kTestSize, string_size.width(), string_size.height()));
+    // Allow the RenderText to paint outside of its display rect.
+    render_text->set_clip_to_display_rect(false);
+    ASSERT_LE(string_size.width() + kTestSize * 2, kCanvasSize.width());
+
     render_text->Draw(canvas.get());
-    int width = render_text->GetStringSize().width();
-    ASSERT_LT(width + kTestWidth, kCanvasSize.width());
-    const uint32* buffer = static_cast<const uint32*>(
-        surface->peekPixels(NULL, NULL));
+    ASSERT_LT(string_size.width() + kTestSize, kCanvasSize.width());
+    const uint32* buffer =
+        static_cast<const uint32*>(surface->peekPixels(nullptr, nullptr));
     ASSERT_NE(nullptr, buffer);
-
-    for (int y = 0; y < kCanvasSize.height(); ++y) {
-      // Allow one column of anti-aliased pixels past the expected width.
-      SkColor color = buffer[width + y * kCanvasSize.width()];
-      EXPECT_LT(220U, color_utils::GetLuminanceForColor(color)) << string;
-      for (int x = 1; x < kTestWidth; ++x) {
-        color = buffer[width + x + y * kCanvasSize.width()];
-        EXPECT_EQ(SK_ColorWHITE, color) << string;
-      }
+    TestRectangleBuffer rect_buffer(string, buffer, kCanvasSize.width(),
+                                    kCanvasSize.height());
+    {
+      SCOPED_TRACE("TextDoesntClip Top Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, 0, kCanvasSize.width(),
+                                  kTestSize);
+    }
+    {
+      SCOPED_TRACE("TextDoesntClip Bottom Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0,
+                                  kTestSize + string_size.height(),
+                                  kCanvasSize.width(), kTestSize);
+    }
+    {
+      SCOPED_TRACE("TextDoesntClip Left Side");
+#if defined(OS_WIN) || defined(OS_MACOSX)
+      // TODO(mukai): On Windows and Mac smoothing draws left of text.
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, kTestSize, kTestSize - 1,
+                                  string_size.height());
+#else
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, kTestSize, kTestSize,
+                                  string_size.height());
+#endif
+    }
+    {
+      SCOPED_TRACE("TextDoesntClip Right Side");
+#if !defined(OS_MACOSX)
+      // TODO(mukai): On Mac text draws to right of GetStringSize
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE,
+                                  kTestSize + string_size.width(), kTestSize,
+                                  kTestSize, string_size.height());
+#endif
     }
   }
 }
+
+// Ensure that the text will clip to the display rect. Draws to a canvas and
+// checks whether any pixel beyond the bounding rectangle is colored.
+TEST_F(RenderTextTest, TextDoesClip) {
+  const wchar_t* kTestStrings[] = {L"TEST", L"W", L"WWWW", L"gAXAXWWWW"};
+  const Size kCanvasSize(300, 50);
+  const int kTestSize = 10;
+
+  skia::RefPtr<SkSurface> surface = skia::AdoptRef(
+      SkSurface::NewRasterN32Premul(kCanvasSize.width(), kCanvasSize.height()));
+  scoped_ptr<Canvas> canvas(
+      Canvas::CreateCanvasWithoutScaling(surface->getCanvas(), 1.0f));
+  scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
+  render_text->SetHorizontalAlignment(ALIGN_LEFT);
+  render_text->SetColor(SK_ColorBLACK);
+
+  for (auto string : kTestStrings) {
+    surface->getCanvas()->clear(SK_ColorWHITE);
+    render_text->SetText(WideToUTF16(string));
+    const Size string_size = render_text->GetStringSize();
+    int fake_width = string_size.width() / 2;
+    int fake_height = string_size.height() / 2;
+    render_text->SetDisplayRect(
+        Rect(kTestSize, kTestSize, fake_width, fake_height));
+    render_text->set_clip_to_display_rect(true);
+    render_text->Draw(canvas.get());
+    ASSERT_LT(string_size.width() + kTestSize, kCanvasSize.width());
+    const uint32* buffer =
+        static_cast<const uint32*>(surface->peekPixels(nullptr, nullptr));
+    ASSERT_NE(nullptr, buffer);
+    TestRectangleBuffer rect_buffer(string, buffer, kCanvasSize.width(),
+                                    kCanvasSize.height());
+    {
+      SCOPED_TRACE("TextDoesClip Top Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, 0, kCanvasSize.width(),
+                                  kTestSize);
+    }
+
+    {
+      SCOPED_TRACE("TextDoesClip Bottom Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, kTestSize + fake_height,
+                                  kCanvasSize.width(), kTestSize);
+    }
+    {
+      SCOPED_TRACE("TextDoesClip Left Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, 0, kTestSize, kTestSize,
+                                  fake_height);
+    }
+    {
+      SCOPED_TRACE("TextDoesClip Right Side");
+      rect_buffer.EnsureSolidRect(SK_ColorWHITE, kTestSize + fake_width,
+                                  kTestSize, kTestSize, fake_height);
+    }
+  }
+}
 
 }  // namespace gfx