Android: added fontattributes, so formatting works well now.

Next: add clipping

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12768 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

ide/AndroidStudio3/app/src/main/cpp/HelloAndroid.cxx

@@ -68,7 +68,7 @@ int main(int argc, char **argv)
   btn2 = new Fl_Button(10, 10, 480, 100, "-@circle;-");
   btn2->color(FL_BLUE);
 
-  btn = new MyButton((win->w()-280)/2, 200, 280, 35, "Hello, Android!");
+  btn = new MyButton((win->w()-280)/2, 200-45, 280, 80, "Hello, Android!\nWhere were you?");
   btn->color(FL_LIGHT2);
   btn->labelsize(30);
   btn->callback(

src/drivers/Android/Fl_Android_Graphics_Driver.H

@@ -76,6 +76,12 @@ public:
   virtual void draw_unscaled(int angle, const char *str, int n, int x, int y);
   virtual void rtl_draw_unscaled(const char* str, int n, int x, int y);
 #endif
+  virtual double width_unscaled(const char *str, int n) override;
+  virtual double width_unscaled(unsigned int c) override;
+  virtual Fl_Fontsize size_unscaled() override;
+  virtual void text_extents_unscaled(const char *str, int n, int &dx, int &dy, int &w, int &h) override;
+  virtual int height_unscaled() override;
+  virtual int descent_unscaled() override;
   virtual void font_unscaled(Fl_Font face, Fl_Fontsize size) override;
 #if 0
   void draw_unscaled(Fl_Pixmap *pxm, float s, int XP, int YP, int WP, int HP, int cx, int cy);

src/drivers/Android/Fl_Android_Graphics_Font.H

@@ -67,6 +67,7 @@ public:
   void load_font();
   Fl_Android_Bytemap *get_bytemap(uint32_t c, int size);
   float get_advance(uint32_t c, Fl_Fontsize size);
+  int get_descent(Fl_Fontsize size);
 };
 
 
@@ -86,6 +87,7 @@ public:
   float get_advance(uint32_t c);
   Fl_Android_Bytemap *get_bytemap(uint32_t c);
   Fl_Android_Font_Source *get_font_source() { return pFontSource; }
+  int get_descent();
 
   static Fl_Android_Font_Descriptor* find(Fl_Font fnum, Fl_Fontsize size);
 };

src/drivers/Android/Fl_Android_Graphics_Font.cxx

@@ -60,7 +60,7 @@ static Fl_Fontdesc built_in_table[] = {
 
 Fl_Fontdesc* fl_fonts = built_in_table;
 
-static char *old_font_names[] = {
+static const char *old_font_names[] = {
         "$DroidSans.ttf", "$DroidSerif-Regular.ttf",
         "$DroidSansMono.ttf", "$DroidSansMono.ttf"
 };
@@ -282,6 +282,19 @@ float Fl_Android_Font_Source::get_advance(uint32_t c, Fl_Fontsize size)
 }
 
 
+int Fl_Android_Font_Source::get_descent(Fl_Fontsize size)
+{
+  if (pFileBuffer==0) load_font();
+  if (pError) return 0.0f;
+
+  int ascent, descent, lineGap;
+  stbtt_GetFontVMetrics(&pFont, &ascent, &descent, &lineGap);
+  float scale = stbtt_ScaleForPixelHeight(&pFont, size);
+
+  return -(descent*scale-0.5f);
+}
+
+
 // -----------------------------------------------------------------------------
 
 /**
@@ -297,6 +310,7 @@ Fl_Android_Font_Descriptor::Fl_Android_Font_Descriptor(const char *fname, Fl_And
         pFontSource(fsrc),
         pFontIndex(fnum)
 {
+  descent = -1;
   if (!pFontSource) {
     pFontSource = new Fl_Android_Font_Source(fname, fnum);
   }
@@ -344,16 +358,26 @@ float Fl_Android_Font_Descriptor::get_advance(uint32_t c)
 Fl_Android_Bytemap *Fl_Android_Font_Descriptor::get_bytemap(uint32_t c)
 {
   Fl_Android_Bytemap *bm = 0;
-  try {
-    bm = pBytemapTable.at(c);
-  } catch(...) {
+  auto it = pBytemapTable.find(c);
+  if (it==pBytemapTable.end()) {
     bm = pFontSource->get_bytemap(c, size);
     if (bm)
       pBytemapTable[c] = bm;
+  } else {
+    bm = it->second;
   }
   return bm;
 }
 
+
+int Fl_Android_Font_Descriptor::get_descent()
+{
+  if (descent==-1)
+    descent = (short)pFontSource->get_descent(size);
+  return descent;
+}
+
+
 /**
  * Find or create a font descriptor for a given font and height.
  * @param fnum index into fl_fonts
@@ -475,6 +499,68 @@ void Fl_Android_Graphics_Driver::draw_unscaled(const char* str, int n, int x, in
   }
 }
 
+
+double Fl_Android_Graphics_Driver::width_unscaled(const char *str, int n)
+{
+  Fl_Android_Font_Descriptor *fd = (Fl_Android_Font_Descriptor*)font_descriptor();
+  if (!fd) return 0;
+
+  int width = 0;
+  const char *e = str+n;
+  for (int i=0; i<n; ) {
+    int incr = 1;
+    unsigned uniChar = fl_utf8decode(str + i, e, &incr);
+    width += ((int)(fd->get_advance(uniChar)+0.5f));
+    i += incr;
+  }
+  return width;
+}
+
+
+double Fl_Android_Graphics_Driver::width_unscaled(unsigned int uniChar)
+{
+  Fl_Android_Font_Descriptor *fd = (Fl_Android_Font_Descriptor*)font_descriptor();
+  if (!fd) return 0;
+  return ((int)(fd->get_advance(uniChar)+0.5f));
+}
+
+
+Fl_Fontsize Fl_Android_Graphics_Driver::size_unscaled()
+{
+  Fl_Android_Font_Descriptor *fd = (Fl_Android_Font_Descriptor*)font_descriptor();
+  if (!fd) return 0;
+  return fd->size;
+}
+
+
+void Fl_Android_Graphics_Driver::text_extents_unscaled(const char *str, int n, int &dx, int &dy, int &w, int &h)
+{
+  dx = 0;
+  dy = descent_unscaled();
+  w = width_unscaled(str, n);
+  h = height_unscaled();
+}
+
+
+int Fl_Android_Graphics_Driver::height_unscaled()
+{
+  // This should really be "ascent - descent + lineGap"
+  Fl_Android_Font_Descriptor *fd = (Fl_Android_Font_Descriptor*)font_descriptor();
+  if (!fd) return 0;
+  return fd->size;
+}
+
+
+int Fl_Android_Graphics_Driver::descent_unscaled()
+{
+  Fl_Android_Font_Descriptor *fd = (Fl_Android_Font_Descriptor*)font_descriptor();
+  if (!fd) return 0;
+  if (fd->descent==-1) fd->get_descent();
+  return fd->descent;
+}
+
+
+
 #if 0
 
 // TODO: do we need that?