Add Getters for intrinsic widths and implement MaxInstrinsicWidth. Update tests.

Change-Id: I210fac9d47f55f8317ca77bca64cfcfd438a246a

engine/src/flutter/src/paragraph.cc

@@ -147,6 +147,10 @@ void Paragraph::Layout(const ParagraphConstraints& constraints,
 
   SkTextBlobBuilder builder;
 
+  // Reset member variables so Layout still works when called more than once
+  max_intrinsic_width_ = 0.0f;
+  lines_ = 0;
+
   minikin::Layout layout;
   SkScalar x = x_offset;
   y_ = y_offset;
@@ -187,6 +191,7 @@ void Paragraph::Layout(const ParagraphConstraints& constraints,
           buffer.pos[pos_index + 1] = layout.getY(glyph_index);
         }
         blob_start += blob_length;
+        max_intrinsic_width_ += layout.getX(blob_start - 1);
       }
 
       // TODO(abarth): We could keep the same SkTextBlobBuilder as long as the
@@ -222,6 +227,14 @@ double Paragraph::GetIdeographicBaseline() const {
   return FLT_MAX;
 }
 
+double Paragraph::GetMaxIntrinsicWidth() const {
+  return max_intrinsic_width_;
+}
+
+double Paragraph::GetMinIntrinsicWidth() const {
+  return min_intrinsic_width_;
+}
+
 double Paragraph::GetHeight() const {
   return paragraph_style_.font_size * paragraph_style_.line_height *
          paragraph_style_.max_lines;

engine/src/flutter/src/paragraph.h

@@ -53,6 +53,10 @@ class Paragraph {
 
   double GetIdeographicBaseline() const;
 
+  double GetMaxIntrinsicWidth() const;
+
+  double GetMinIntrinsicWidth() const;
+
   bool DidExceedMaxLines() const;
 
  private:
@@ -73,6 +77,8 @@ class Paragraph {
   SkScalar y_ = 0.0f;  // Height of the paragraph after Layout().
   double width_ = 0.0f;
   int lines_ = 0;
+  double max_intrinsic_width_ = 0.0f;
+  double min_intrinsic_width_ = FLT_MAX;
 
   void SetText(std::vector<uint16_t> text, StyledRuns runs);
 

engine/src/flutter/tests/txt/paragraph_unittests.cc

@@ -110,7 +110,9 @@ TEST_F(RenderTest, RainbowParagraph) {
   auto icu_text4 = icu::UnicodeString::fromUTF8(text4);
   std::u16string u16_text4(icu_text4.getBuffer(),
                            icu_text4.getBuffer() + icu_text4.length());
-  const char* text5 = "ContinueLastStyle";
+  const char* text5 =
+      "Continue Last Style With lots of words to check if it overlaps properly "
+      "or not";
   auto icu_text5 = icu::UnicodeString::fromUTF8(text5);
   std::u16string u16_text5(icu_text5.getBuffer(),
                            icu_text5.getBuffer() + icu_text5.length());
@@ -284,6 +286,7 @@ TEST_F(RenderTest, LinebreakParagraph) {
                           icu_text.getBuffer() + icu_text.length());
 
   txt::ParagraphStyle paragraph_style;
+  paragraph_style.max_lines = 1000;
   txt::ParagraphBuilder builder(paragraph_style);
 
   txt::TextStyle text_style;