[core] Add possibility of overriding paint properties inside format expression #14062

* [core] Add format override expression and formatted section to evaluation context

* [core] Add textColor to TaggedString's formatted section

* [core] Add FormatSectionOverrides and introduce overridable properties

* [core] Populate symbol layer paint properties for text sections

* [core] Add benchmark for style that uses text-color override

* [core] Add unit test for FormatOverrideExpression

* [core] Add unit test for FormatSectionOverrides

1 files changed, 5 insertions, 3 deletions

diff --git a/src/mbgl/text/glyph.hpp b/src/mbgl/text/glyph.hpp
index 034784dc24..c97b242c10 100644
--- a/src/mbgl/text/glyph.hpp
+++ b/src/mbgl/text/glyph.hpp
@@ -19,7 +19,7 @@ namespace mbgl {
 
 using GlyphID = char16_t;
 using GlyphIDs = std::set<GlyphID>;
-    
+
 // Note: this only works for the BMP
 GlyphRange getGlyphRange(GlyphID glyph);
 
@@ -59,8 +59,8 @@ using GlyphMap = std::map<FontStackHash, Glyphs>;
 
 class PositionedGlyph {
 public:
-    explicit PositionedGlyph(GlyphID glyph_, float x_, float y_, bool vertical_, FontStackHash font_, float scale_)
-        : glyph(glyph_), x(x_), y(y_), vertical(vertical_), font(font_), scale(scale_)
+    explicit PositionedGlyph(GlyphID glyph_, float x_, float y_, bool vertical_, FontStackHash font_, float scale_, std::size_t sectionIndex_ = 0)
+        : glyph(glyph_), x(x_), y(y_), vertical(vertical_), font(font_), scale(scale_), sectionIndex(sectionIndex_)
     {}
 
     GlyphID glyph = 0;
@@ -70,6 +70,8 @@ public:
     
     FontStackHash font = 0;
     float scale = 0.0;
+    // Maps positioned glyph to TaggedString section
+    std::size_t sectionIndex;
 };
 
 enum class WritingModeType : uint8_t;