renderer: introduce text rendering

2 files changed, 22 insertions, 24 deletions

diff --git a/src/common/Font.cpp b/src/common/Font.cpp
index 82f6ad8..8f058ca 100644
--- a/src/common/Font.cpp
+++ b/src/common/Font.cpp
@@ -12,30 +12,24 @@ is_ch_ascii(char32_t ch)
     return result;
 }
 
-Font::~Font()
-{
-    delete[] m_file_content;
-}
-
-bool
-Font::Init(const char* path, int font_size)
+Font::Font(const char *path, int font_size)
 {
     if (!ReadFile(path)) {
-        return false;
+        return;
     }
 
 
-    // set font info
+    // init m_file_content, m_font_info
     if (!stbtt_InitFont(&m_font_info, (unsigned char*)m_file_content, 0))
     {
         std::cout << "stbtt_InitFont failed.\n";
         delete[] m_file_content;
         m_file_content = nullptr;
-        return false;
+        return;
     }
 
 
-    // set font settings (scale + vmetrics)
+    // init font settings
     float scale = stbtt_ScaleForPixelHeight(&m_font_info, (float)font_size);
     int baseline, ascent, descent, line_gap;
     stbtt_GetFontVMetrics(&m_font_info, &ascent, &descent, &line_gap);
@@ -44,8 +38,6 @@ Font::Init(const char* path, int font_size)
     descent  = int(scale * (float)descent);
     line_gap = int(scale * (float)line_gap);
 
-
-    // init members
     m_font_scale = scale;
     m_font_baseline = baseline;
     m_font_yadvance = ascent - descent + line_gap;
@@ -53,12 +45,14 @@ Font::Init(const char* path, int font_size)
 
     // load glyphs
     for (char c = first_ascii_ch; c <= last_ascii_ch; ++c) {
-        LoadGlyph(m_glyphs[c-first_ascii_ch], static_cast<char32_t>(c));
+        InitGlyph(m_glyphs[c-first_ascii_ch], static_cast<char32_t>(c));
     }
     memset((void*)&m_fail_glyph, 0, sizeof(m_fail_glyph));
+}
 
-
-    return true;
+Font::~Font()
+{
+    delete[] m_file_content;
 }
 
 bool
@@ -83,7 +77,7 @@ Font::ReadFile(const char* path)
 }
 
 void
-Font::LoadGlyph(Glyph& glyph, char32_t c)
+Font::InitGlyph(Glyph& glyph, char32_t c)
 {
     int bbx0, bby0, bbx1, bby1;
     stbtt_GetCodepointBitmapBox(&m_font_info, (int)c, m_font_scale, m_font_scale, &bbx0, &bby0, &bbx1, &bby1);
@@ -130,8 +124,10 @@ Font::LoadGlyph(Glyph& glyph, char32_t c)
 AlphaBitmap&
 Font::GetAlphaBitmap(char32_t c)
 {
-    if (is_ch_ascii(c)) {
-        return m_glyphs[c - first_ascii_ch].bitmap;
+    if (m_file_content) {
+        if (is_ch_ascii(c)) {
+            return m_glyphs[c - first_ascii_ch].bitmap;
+        }
     }
 
     return m_fail_glyph.bitmap;
@@ -140,8 +136,10 @@ Font::GetAlphaBitmap(char32_t c)
 Glyph&
 Font::GetGlyph(char32_t c)
 {
-    if (is_ch_ascii(c)) {
-        return m_glyphs[c - first_ascii_ch];
+    if (m_file_content) {
+        if (is_ch_ascii(c)) {
+            return m_glyphs[c - first_ascii_ch];
+        }
     }
     
     return m_fail_glyph;
diff --git a/src/common/Font.hpp b/src/common/Font.hpp
index af4ddb5..876b03a 100644
--- a/src/common/Font.hpp
+++ b/src/common/Font.hpp
@@ -23,9 +23,9 @@ struct Glyph {
 
 class Font {
 public:
+    explicit Font(const char* path, int size);
     ~Font();
 
-    bool Init(const char* path, int font_size);
     AlphaBitmap& GetAlphaBitmap(char32_t c);
     Glyph& GetGlyph(char32_t c);
 
@@ -33,7 +33,7 @@ public:
 
 private:
     bool ReadFile(const char* path);
-    void LoadGlyph(Glyph& glyph, char32_t c);
+    void InitGlyph(Glyph& glyph, char32_t c);
 
 
 private:
@@ -43,12 +43,12 @@ private:
 
 
     const char* m_file_content = nullptr;
+    stbtt_fontinfo m_font_info;
 
     float m_font_scale;
     int m_font_baseline;
     int m_font_yadvance;
 
-    stbtt_fontinfo m_font_info;
     Glyph m_glyphs[ascii_glyph_count];
     Glyph m_fail_glyph;
 };