Allow various font weights in gfx.

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index b133b976d9657666d05cdb5200062eee1aae0c01..1abdf5b7be258f1fbd4ba783acf7db5176437e7f 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -20,6 +20,7 @@
 #include "third_party/icu/source/common/unicode/rbbi.h"
 #include "third_party/icu/source/common/unicode/utf16.h"
 #include "third_party/skia/include/core/SkDrawLooper.h"
+#include "third_party/skia/include/core/SkFontStyle.h"
 #include "third_party/skia/include/core/SkTypeface.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/canvas.h"
@@ -90,16 +91,6 @@ int DetermineBaselineCenteringText(const Rect& display_rect,
   return baseline + std::max(min_shift, std::min(max_shift, baseline_shift));
 }
 
-#if !defined(OS_MACOSX)
-// Converts |Font::FontStyle| flags to |SkTypeface::Style| flags.
-SkTypeface::Style ConvertFontStyleToSkiaTypefaceStyle(int font_style) {
-  int skia_style = SkTypeface::kNormal;
-  skia_style |= (font_style & Font::BOLD) ? SkTypeface::kBold : 0;
-  skia_style |= (font_style & Font::ITALIC) ? SkTypeface::kItalic : 0;
-  return static_cast<SkTypeface::Style>(skia_style);
-}
-#endif
-
 int round(float value) {
   return static_cast<int>(floor(value + 0.5f));
 }
@@ -257,15 +248,18 @@ void SkiaTextRenderer::SetTextSize(SkScalar size) {
   paint_.setTextSize(size);
 }
 
-void SkiaTextRenderer::SetFontWithStyle(const Font& font, int style) {
-  skia::RefPtr<SkTypeface> typeface = CreateSkiaTypeface(font, style);
+void SkiaTextRenderer::SetFont(const Font& font,
+                               bool italic,
+                               gfx::Font::Weight weight) {
+  skia::RefPtr<SkTypeface> typeface = CreateSkiaTypeface(font, italic, weight);
   if (typeface) {
     // |paint_| adds its own ref. So don't |release()| it from the ref ptr here.
     SetTypeface(typeface.get());
 
     // Enable fake bold text if bold style is needed but new typeface does not
     // have it.
-    paint_.setFakeBoldText((style & Font::BOLD) && !typeface->isBold());
+    paint_.setFakeBoldText(weight >= gfx::Font::Weight::SEMIBOLD &&
+                           !typeface->isBold());
   }
 }
 
@@ -388,10 +382,15 @@ void SkiaTextRenderer::DiagonalStrike::Draw() {
 
 StyleIterator::StyleIterator(const BreakList<SkColor>& colors,
                              const BreakList<BaselineStyle>& baselines,
+                             const BreakList<gfx::Font::Weight>& weights,
                              const std::vector<BreakList<bool>>& styles)
-    : colors_(colors), baselines_(baselines), styles_(styles) {
+    : colors_(colors),
+      baselines_(baselines),
+      weights_(weights),
+      styles_(styles) {
   color_ = colors_.breaks().begin();
   baseline_ = baselines_.breaks().begin();
+  weight_ = weights_.breaks().begin();
   for (size_t i = 0; i < styles_.size(); ++i)
     style_.push_back(styles_[i].breaks().begin());
 }
@@ -401,6 +400,7 @@ StyleIterator::~StyleIterator() {}
 Range StyleIterator::GetRange() const {
   Range range(colors_.GetRange(color_));
   range = range.Intersect(baselines_.GetRange(baseline_));
+  range = range.Intersect(weights_.GetRange(weight_));
   for (size_t i = 0; i < NUM_TEXT_STYLES; ++i)
     range = range.Intersect(styles_[i].GetRange(style_[i]));
   return range;
@@ -409,6 +409,7 @@ Range StyleIterator::GetRange() const {
 void StyleIterator::UpdatePosition(size_t position) {
   color_ = colors_.GetBreak(position);
   baseline_ = baselines_.GetBreak(position);
+  weight_ = weights_.GetBreak(position);
   for (size_t i = 0; i < NUM_TEXT_STYLES; ++i)
     style_[i] = styles_[i].GetBreak(position);
 }
@@ -424,8 +425,12 @@ Line::Line(const Line& other) = default;
 Line::~Line() {}
 
 #if !defined(OS_MACOSX)
-skia::RefPtr<SkTypeface> CreateSkiaTypeface(const gfx::Font& font, int style) {
-  SkTypeface::Style skia_style = ConvertFontStyleToSkiaTypefaceStyle(style);
+skia::RefPtr<SkTypeface> CreateSkiaTypeface(const gfx::Font& font,
+                                            bool italic,
+                                            gfx::Font::Weight weight) {
+  SkFontStyle skia_style(
+      static_cast<int>(weight), SkFontStyle::kNormal_Width,
+      italic ? SkFontStyle::kItalic_Slant : SkFontStyle::kUpright_Slant);
   return skia::AdoptRef(
       SkTypeface::CreateFromName(font.GetFontName().c_str(), skia_style));
 }
@@ -475,6 +480,7 @@ void RenderText::SetText(const base::string16& text) {
   // the first style to the whole text instead.
   colors_.SetValue(colors_.breaks().begin()->second);
   baselines_.SetValue(baselines_.breaks().begin()->second);
+  weights_.SetValue(weights_.breaks().begin()->second);
   for (size_t style = 0; style < NUM_TEXT_STYLES; ++style)
     styles_[style].SetValue(styles_[style].breaks().begin()->second);
   cached_bounds_and_offset_valid_ = false;
@@ -510,9 +516,9 @@ void RenderText::SetHorizontalAlignment(HorizontalAlignment alignment) {
 void RenderText::SetFontList(const FontList& font_list) {
   font_list_ = font_list;
   const int font_style = font_list.GetFontStyle();
-  SetStyle(BOLD, (font_style & gfx::Font::BOLD) != 0);
-  SetStyle(ITALIC, (font_style & gfx::Font::ITALIC) != 0);
-  SetStyle(UNDERLINE, (font_style & gfx::Font::UNDERLINE) != 0);
+  weights_.SetValue(font_list.GetFontWeight());
+  styles_[ITALIC].SetValue((font_style & gfx::Font::ITALIC) != 0);
+  styles_[UNDERLINE].SetValue((font_style & gfx::Font::UNDERLINE) != 0);
   baseline_ = kInvalidBaseline;
   cached_bounds_and_offset_valid_ = false;
   OnLayoutTextAttributeChanged(false);
@@ -772,6 +778,20 @@ void RenderText::ApplyStyle(TextStyle style, bool value, const Range& range) {
   OnLayoutTextAttributeChanged(false);
 }
 
+void RenderText::SetWeight(gfx::Font::Weight weight) {
+  weights_.SetValue(weight);
+
+  cached_bounds_and_offset_valid_ = false;
+  OnLayoutTextAttributeChanged(false);
+}
+
+void RenderText::ApplyWeight(gfx::Font::Weight weight, const Range& range) {
+  weights_.ApplyValue(weight, range);
+
+  cached_bounds_and_offset_valid_ = false;
+  OnLayoutTextAttributeChanged(false);
+}
+
 bool RenderText::GetStyle(TextStyle style) const {
   return (styles_[style].breaks().size() == 1) &&
       styles_[style].breaks().front().second;
@@ -1003,6 +1023,7 @@ RenderText::RenderText()
       composition_range_(Range::InvalidRange()),
       colors_(kDefaultColor),
       baselines_(NORMAL_BASELINE),
+      weights_(gfx::Font::Weight::NORMAL),
       styles_(NUM_TEXT_STYLES),
       composition_and_selection_styles_applied_(false),
       obscured_(false),
@@ -1017,8 +1038,7 @@ RenderText::RenderText()
       subpixel_rendering_suppressed_(false),
       clip_to_display_rect_(true),
       baseline_(kInvalidBaseline),
-      cached_bounds_and_offset_valid_(false) {
-}
+      cached_bounds_and_offset_valid_(false) {}
 
 SelectionModel RenderText::GetAdjacentSelectionModel(
     const SelectionModel& current,
@@ -1286,6 +1306,7 @@ void RenderText::UpdateStyleLengths() {
   const size_t text_length = text_.length();
   colors_.SetMax(text_length);
   baselines_.SetMax(text_length);
+  weights_.SetMax(text_length);
   for (size_t style = 0; style < NUM_TEXT_STYLES; ++style)
     styles_[style].SetMax(text_length);
 }
@@ -1389,6 +1410,7 @@ base::string16 RenderText::Elide(const base::string16& text,
   render_text->styles_ = styles_;
   render_text->baselines_ = baselines_;
   render_text->colors_ = colors_;
+  render_text->weights_ = weights_;
   if (text_width == 0) {
     render_text->SetText(text);
     text_width = render_text->GetContentWidthF();
@@ -1446,6 +1468,7 @@ base::string16 RenderText::Elide(const base::string16& text,
     for (size_t style = 0; style < NUM_TEXT_STYLES; ++style)
       RestoreBreakList(render_text.get(), &render_text->styles_[style]);
     RestoreBreakList(render_text.get(), &render_text->baselines_);
+    RestoreBreakList(render_text.get(), &render_text->weights_);
 
     // We check the width of the whole desired string at once to ensure we
     // handle kerning/ligatures/etc. correctly.