Don't use "ascent" field of Scintilla Font class any more.

This field will be removed in Scintilla 3.5.5.

See #16776.

src/stc/PlatWX.cpp

@@ -75,9 +75,45 @@ wxColour wxColourFromCDandAlpha(ColourDesired& cd, int alpha) {
 
 //----------------------------------------------------------------------
 
+namespace
+{
+
+// wxFont with ascent cached, a pointer to this type is stored in Font::fid.
+class wxFontWithAscent : public wxFont
+{
+public:
+    explicit wxFontWithAscent(const wxFont &font)
+        : wxFont(font),
+          m_ascent(0)
+    {
+    }
+
+    static wxFontWithAscent* FromFID(FontID fid)
+    {
+        return static_cast<wxFontWithAscent*>(fid);
+    }
+
+    void SetAscent(int ascent) { m_ascent = ascent; }
+    int GetAscent() const { return m_ascent; }
+
+private:
+    int m_ascent;
+};
+
+void SetAscent(Font& f, int ascent)
+{
+    wxFontWithAscent::FromFID(f.GetID())->SetAscent(ascent);
+}
+
+int GetAscent(Font& f)
+{
+    return wxFontWithAscent::FromFID(f.GetID())->GetAscent();
+}
+
+} // anonymous namespace
+
 Font::Font() {
     fid = 0;
-    ascent = 0;
 }
 
 Font::~Font() {
@@ -104,20 +140,20 @@ void Font::Create(const FontParameters &fp) {
     else
         weight = wxFONTWEIGHT_NORMAL;
 
-    wxFont* font = new wxFont(fp.size,
+    wxFont font(fp.size,
         wxFONTFAMILY_DEFAULT,
         fp.italic ? wxFONTSTYLE_ITALIC :  wxFONTSTYLE_NORMAL,
         weight,
         false,
         stc2wx(fp.faceName),
         encoding);
-    fid = font;
+    fid = new wxFontWithAscent(font);
 }
 
 
 void Font::Release() {
     if (fid)
-        delete (wxFont*)fid;
+        delete wxFontWithAscent::FromFID(fid);
     fid = 0;
 }
 
@@ -478,7 +514,7 @@ void SurfaceImpl::DrawTextNoClip(PRectangle rc, Font &font, XYPOSITION ybase,
 
     // ybase is where the baseline should be, but wxWin uses the upper left
     // corner, so I need to calculate the real position for the text...
-    hdc->DrawText(stc2wx(s, len), rc.left, ybase - font.ascent);
+    hdc->DrawText(stc2wx(s, len), rc.left, ybase - GetAscent(font));
 }
 
 void SurfaceImpl::DrawTextClipped(PRectangle rc, Font &font, XYPOSITION ybase,
@@ -491,7 +527,7 @@ void SurfaceImpl::DrawTextClipped(PRectangle rc, Font &font, XYPOSITION ybase,
     hdc->SetClippingRegion(wxRectFromPRectangle(rc));
 
     // see comments above
-    hdc->DrawText(stc2wx(s, len), rc.left, ybase - font.ascent);
+    hdc->DrawText(stc2wx(s, len), rc.left, ybase - GetAscent(font));
     hdc->DestroyClippingRegion();
 }
 
@@ -506,7 +542,7 @@ void SurfaceImpl::DrawTextTransparent(PRectangle rc, Font &font, XYPOSITION ybas
 
     // ybase is where the baseline should be, but wxWin uses the upper left
     // corner, so I need to calculate the real position for the text...
-    hdc->DrawText(stc2wx(s, len), rc.left, ybase - font.ascent);
+    hdc->DrawText(stc2wx(s, len), rc.left, ybase - GetAscent(font));
 
     hdc->SetBackgroundMode(wxBRUSHSTYLE_SOLID);
 }
@@ -583,8 +619,9 @@ XYPOSITION SurfaceImpl::Ascent(Font &font) {
     SetFont(font);
     int w, h, d, e;
     hdc->GetTextExtent(EXTENT_TEST, &w, &h, &d, &e);
-    font.ascent = h - d;
+    const int ascent = h - d;
-    return font.ascent;
+    SetAscent(font, ascent);
+    return ascent;
 }
 
 XYPOSITION SurfaceImpl::Descent(Font &font) {

src/stc/scintilla/include/Platform.h

@@ -255,9 +255,7 @@ struct FontParameters {
 class Font {
 protected:
 	FontID fid;
-#if PLAT_WX
+
-	int ascent;
-#endif
 	// Private so Font objects can not be copied
 	Font(const Font &);
 	Font &operator=(const Font &);
@@ -271,9 +269,7 @@ public:
 	FontID GetID() { return fid; }
 	// Alias another font - caller guarantees not to Release
 	void SetID(FontID fid_) { fid = fid_; }
-#if PLAT_WX
+
-	void SetAscent(int ascent_) { ascent = ascent_; }
-#endif
 	friend class Surface;
 	friend class SurfaceImpl;
 };

src/stc/scintilla/src/Style.cxx

@@ -159,8 +159,5 @@ void Style::ClearTo(const Style &source) {
 
 void Style::Copy(Font &font_, const FontMeasurements &fm_) {
 	font.MakeAlias(font_);
-#if PLAT_WX
-	font.SetAscent(fm_.ascent);
-#endif
 	(FontMeasurements &)(*this) = fm_;
 }