diff --git a/lib/font_renderer/font_renderer.cpp b/lib/font_renderer/font_renderer.cpp
index b8bf44e6..f97fede8 100644
--- a/lib/font_renderer/font_renderer.cpp
+++ b/lib/font_renderer/font_renderer.cpp
@@ -10,15 +10,15 @@
 // Important: when a subpixel scale is used the width below will be the width in logical pixel.
 // As each logical pixel contains 3 subpixels it means that the 'pixels' pointer
 // will hold enough space for '3 * width' uint8_t values.
-struct FontRendererBitmap {
+struct FR_Bitmap {
   agg::int8u *pixels;
   int width, height;
 };
 
 typedef agg::blender_rgb_gamma<agg::rgba8, agg::order_bgra, agg::gamma_lut<> > blender_gamma_type;
 
-FontRendererBitmap* FontRendererBitmapNew(int width, int height, int subpixel_scale) {
-    FontRendererBitmap *image = (FontRendererBitmap *) malloc(sizeof(FontRendererBitmap) + width * height * subpixel_scale);
+FR_Bitmap* FR_Bitmap_New(int width, int height, int subpixel_scale) {
+    FR_Bitmap *image = (FR_Bitmap *) malloc(sizeof(FR_Bitmap) + width * height * subpixel_scale);
     if (!image) { return NULL; }
     image->pixels = (agg::int8u *) (image + 1);
     image->width = width;
@@ -26,16 +26,16 @@ FontRendererBitmap* FontRendererBitmapNew(int width, int height, int subpixel_sc
     return image;
 }
 
-void FontRendererBitmapFree(FontRendererBitmap *image) {
+void FR_Bitmap_Free(FR_Bitmap *image) {
   free(image);
 }
 
-class FontRendererImpl {
+class FR_Impl {
 public:
     // Conventional LUT values: (1./3., 2./9., 1./9.)
     // The values below are fine tuned as in the Elementary Plot library.
 
-    FontRendererImpl(bool hinting, bool kerning, bool subpixel, float gamma_value) :
+    FR_Impl(bool hinting, bool kerning, bool subpixel, float gamma_value) :
         m_renderer(hinting, kerning, subpixel),
         m_gamma_lut(double(gamma_value)),
         m_blender(),
@@ -56,23 +56,23 @@ private:
     agg::lcd_distribution_lut m_lcd_lut;
 };
 
-FontRenderer *FontRendererNew(unsigned int flags, float gamma) {
+FontRenderer *FR_New(unsigned int flags, float gamma) {
     bool hinting = ((flags & FONT_RENDERER_HINTING) != 0);
     bool kerning = ((flags & FONT_RENDERER_KERNING) != 0);
     bool subpixel = ((flags & FONT_RENDERER_SUBPIXEL) != 0);
-    return new FontRendererImpl(hinting, kerning, subpixel, gamma);
+    return new FR_Impl(hinting, kerning, subpixel, gamma);
 }
 
-void FontRendererFree(FontRenderer *font_renderer) {
+void FR_Free(FontRenderer *font_renderer) {
     delete font_renderer;
 }
 
-int FontRendererLoadFont(FontRenderer *font_renderer, const char *filename) {
+int FR_Load_Font(FontRenderer *font_renderer, const char *filename) {
     bool success = font_renderer->renderer_alpha().load_font(filename);
     return (success ? 0 : 1);
 }
 
-int FontRendererGetFontHeight(FontRenderer *font_renderer, float size) {
+int FR_Get_Font_Height(FontRenderer *font_renderer, float size) {
     font_renderer_alpha& renderer_alpha = font_renderer->renderer_alpha();
     double ascender, descender;
     renderer_alpha.get_font_vmetrics(ascender, descender);
@@ -81,7 +81,7 @@ int FontRendererGetFontHeight(FontRenderer *font_renderer, float size) {
     return int((ascender - descender) * face_height * scale + 0.5);
 }
 
-static void glyph_trim_rect(agg::rendering_buffer& ren_buf, GlyphBitmapInfo& gli, int subpixel_scale) {
+static void glyph_trim_rect(agg::rendering_buffer& ren_buf, FR_Bitmap_Glyph_Metrics& gli, int subpixel_scale) {
     const int height = ren_buf.height();
     int x0 = gli.x0 * subpixel_scale, x1 = gli.x1 * subpixel_scale;
     int y0 = gli.y0, y1 = gli.y1;
@@ -145,7 +145,7 @@ static void glyph_trim_rect(agg::rendering_buffer& ren_buf, GlyphBitmapInfo& gli
     gli.y1 = y1;
 }
 
-static void glyph_lut_convolution(agg::rendering_buffer ren_buf, agg::lcd_distribution_lut& lcd_lut, agg::int8u *covers_buf, GlyphBitmapInfo& gli) {
+static void glyph_lut_convolution(agg::rendering_buffer ren_buf, agg::lcd_distribution_lut& lcd_lut, agg::int8u *covers_buf, FR_Bitmap_Glyph_Metrics& gli) {
     const int subpixel = 3;
     const int x0 = gli.x0, y0 = gli.y0, x1 = gli.x1, y1 = gli.y1;
     const int len = (x1 - x0) * subpixel;
@@ -169,9 +169,9 @@ static int ceil_to_multiple(int n, int p) {
     return p * ((n + p - 1) / p);
 }
 
-int FontRendererBakeFontBitmap(FontRenderer *font_renderer, int font_height,
-    FontRendererBitmap *image,
-    int first_char, int num_chars, GlyphBitmapInfo *glyphs, int subpixel_scale)
+int FR_Bake_Font_Bitmap(FontRenderer *font_renderer, int font_height,
+    FR_Bitmap *image,
+    int first_char, int num_chars, FR_Bitmap_Glyph_Metrics *glyphs, int subpixel_scale)
 {
     font_renderer_alpha& renderer_alpha = font_renderer->renderer_alpha();
 
@@ -222,7 +222,7 @@ int FontRendererBakeFontBitmap(FontRenderer *font_renderer, int font_height,
         int x_next_i = (subpixel_scale == 1 ? int(x_next + 1.0) : ceil_to_multiple(x_next + 0.5, subpixel_scale));
 
         // Below x and x_next_i will always be integer multiples of subpixel_scale.
-        GlyphBitmapInfo& glyph_info = glyphs[i];
+        FR_Bitmap_Glyph_Metrics& glyph_info = glyphs[i];
         glyph_info.x0 = x / subpixel_scale;
         glyph_info.y0 = pixels_height - 1 - (y_baseline + ascender_px  + pad_y); // FIXME: add -1 ?
         glyph_info.x1 = x_next_i / subpixel_scale;
@@ -303,7 +303,7 @@ void blend_solid_hspan_rgb_subpixel(agg::rendering_buffer& rbuf, agg::gamma_lut<
 
 #if 0
 // destination implicitly BGRA32. Source implictly single-byte renderer_alpha coverage.
-void FontRendererBlendGamma(FontRenderer *font_renderer, uint8_t *dst, int dst_stride, uint8_t *src, int src_stride, int region_width, int region_height, FontRendererColor color) {
+void FR_Blend_Gamma(FontRenderer *font_renderer, uint8_t *dst, int dst_stride, uint8_t *src, int src_stride, int region_width, int region_height, FR_Color color) {
     blender_gamma_type& blender = font_renderer->blender();
     agg::rendering_buffer dst_ren_buf(dst, region_width, region_height, dst_stride);
     const agg::rgba8 color_a(color.r, color.g, color.b);
@@ -316,7 +316,7 @@ void FontRendererBlendGamma(FontRenderer *font_renderer, uint8_t *dst, int dst_s
 
 // destination implicitly BGRA32. Source implictly single-byte renderer_alpha coverage with subpixel scale = 3.
 // FIXME: consider using something like RenColor* instead of uint8_t * for dst.
-void FontRendererBlendGammaSubpixel(FontRenderer *font_renderer, FontRendererClipArea *clip, int x, int y, uint8_t *dst, int dst_width, const FontRendererBitmap *glyphs_bitmap, const GlyphBitmapInfo *glyph, FontRendererColor color) {
+void FR_Blend_Gamma_Subpixel(FontRenderer *font_renderer, FR_Clip_Area *clip, int x, int y, uint8_t *dst, int dst_width, const FR_Bitmap *glyphs_bitmap, const FR_Bitmap_Glyph_Metrics *glyph, FR_Color color) {
     agg::gamma_lut<>& gamma = font_renderer->gamma();
     agg::lcd_distribution_lut& lcd_lut = font_renderer->lcd_distribution_lut();
     const int subpixel_scale = 3;
diff --git a/lib/font_renderer/font_renderer.h b/lib/font_renderer/font_renderer.h
index 91102782..afd71bff 100644
--- a/lib/font_renderer/font_renderer.h
+++ b/lib/font_renderer/font_renderer.h
@@ -10,12 +10,12 @@ extern "C" {
 typedef struct {
   unsigned short x0, y0, x1, y1;
   float xoff, yoff, xadvance;
-} GlyphBitmapInfo;
+} FR_Bitmap_Glyph_Metrics;
 
-typedef struct FontRendererBitmap FontRendererBitmap;
+typedef struct FR_Bitmap FR_Bitmap;
 
-struct FontRendererImpl;
-typedef struct FontRendererImpl FontRenderer;
+struct FR_Impl;
+typedef struct FR_Impl FontRenderer;
 
 enum {
     FONT_RENDERER_HINTING  = 1 << 0,
@@ -25,43 +25,43 @@ enum {
 
 typedef struct {
     uint8_t r, g, b;
-} FontRendererColor;
+} FR_Color;
 
 typedef struct {
   int left, top, right, bottom;
-} FontRendererClipArea;
+} FR_Clip_Area;
 
-FontRenderer *  FontRendererNew(unsigned int flags, float gamma);
+FontRenderer *  FR_New(unsigned int flags, float gamma);
 
-void            FontRendererFree(FontRenderer *);
+void            FR_Free(FontRenderer *);
 
-int             FontRendererLoadFont(FontRenderer *, const char *filename);
+int             FR_Load_Font(FontRenderer *, const char *filename);
 
-int             FontRendererGetFontHeight(FontRenderer *, float size);
+int             FR_Get_Font_Height(FontRenderer *, float size);
 
-int             FontRendererBakeFontBitmap(FontRenderer *, int font_height,
-                    FontRendererBitmap *image,
-                    int first_char, int num_chars, GlyphBitmapInfo *glyph_info,
+int             FR_Bake_Font_Bitmap(FontRenderer *, int font_height,
+                    FR_Bitmap *image,
+                    int first_char, int num_chars, FR_Bitmap_Glyph_Metrics *glyph_info,
                     int subpixel_scale);
 
 #if 0
 // FIXME: this function needs to be updated to match BlendGammaSubpixel.
-void            FontRendererBlendGamma(FontRenderer *,
+void            FR_Blend_Gamma(FontRenderer *,
                     uint8_t *dst, int dst_stride,
                     uint8_t *src, int src_stride,
                     int region_width, int region_height,
-                    FontRendererColor color);
+                    FR_Color color);
 #endif
 
-void            FontRendererBlendGammaSubpixel(FontRenderer *font_renderer,
-                    FontRendererClipArea *clip, int x, int y,
+void            FR_Blend_Gamma_Subpixel(FontRenderer *font_renderer,
+                    FR_Clip_Area *clip, int x, int y,
                     uint8_t *dst, int dst_width,
-                    const FontRendererBitmap *glyphs_bitmap,
-                    const GlyphBitmapInfo *glyph, FontRendererColor color);
+                    const FR_Bitmap *glyphs_bitmap,
+                    const FR_Bitmap_Glyph_Metrics *glyph, FR_Color color);
 
-FontRendererBitmap* FontRendererBitmapNew(int width, int height, int subpixel_scale);
+FR_Bitmap* FR_Bitmap_New(int width, int height, int subpixel_scale);
 
-void FontRendererBitmapFree(FontRendererBitmap *image);
+void FR_Bitmap_Free(FR_Bitmap *image);
 
 #ifdef __cplusplus
 }
diff --git a/src/renderer.c b/src/renderer.c
index 2668b78d..bbdfa2b4 100644
--- a/src/renderer.c
+++ b/src/renderer.c
@@ -13,8 +13,8 @@ struct RenImage {
 };
 
 struct GlyphSet {
-  FontRendererBitmap *image;
-  GlyphBitmapInfo glyphs[256];
+  FR_Bitmap *image;
+  FR_Bitmap_Glyph_Metrics glyphs[256];
 };
 typedef struct GlyphSet GlyphSet;
 
@@ -29,7 +29,7 @@ struct RenFont {
 
 static SDL_Window *window;
 //static struct { int left, top, right, bottom; } clip;
-static FontRendererClipArea clip;
+static FR_Clip_Area clip;
 
 static void* check_alloc(void *ptr) {
   if (!ptr) {
@@ -113,17 +113,16 @@ static GlyphSet* load_glyphset(RenFont *font, int idx) {
   int width = 128;
   int height = 128;
 retry:
-  set->image = FontRendererBitmapNew(width, height, subpixel_scale);
-  check_alloc(set->image);
+  set->image = check_alloc(FR_Bitmap_New(width, height, subpixel_scale));
 
-  int res = FontRendererBakeFontBitmap(font->renderer, font->height,
+  int res = FR_Bake_Font_Bitmap(font->renderer, font->height,
     set->image, idx << 8, 256, set->glyphs, subpixel_scale);
 
   /* retry with a larger image buffer if the buffer wasn't large enough */
   if (res < 0) {
     width *= 2;
     height *= 2;
-    FontRendererBitmapFree(set->image);
+    FR_Bitmap_Free(set->image);
     goto retry;
   }
 
@@ -153,15 +152,15 @@ RenFont* ren_load_font(const char *filename, float size) {
   font->size = size;
 
   const float gamma = 1.5;
-  font->renderer = FontRendererNew(FONT_RENDERER_HINTING|FONT_RENDERER_SUBPIXEL, gamma);
-  if (FontRendererLoadFont(font->renderer, filename)) {
+  font->renderer = FR_New(FONT_RENDERER_HINTING|FONT_RENDERER_SUBPIXEL, gamma);
+  if (FR_Load_Font(font->renderer, filename)) {
     free(font);
     return NULL;
   }
-  font->height = FontRendererGetFontHeight(font->renderer, size);
+  font->height = FR_Get_Font_Height(font->renderer, size);
 
   /* make tab and newline glyphs invisible */
-  GlyphBitmapInfo *g = get_glyphset(font, '\n')->glyphs;
+  FR_Bitmap_Glyph_Metrics *g = get_glyphset(font, '\n')->glyphs;
   g['\t'].x1 = g['\t'].x0;
   g['\n'].x1 = g['\n'].x0;
 
@@ -173,11 +172,11 @@ void ren_free_font(RenFont *font) {
   for (int i = 0; i < MAX_GLYPHSET; i++) {
     GlyphSet *set = font->sets[i];
     if (set) {
-      FontRendererBitmapFree(set->image);
+      FR_Bitmap_Free(set->image);
       free(set);
     }
   }
-  FontRendererFree(font->renderer);
+  FR_Free(font->renderer);
   free(font);
 }
 
@@ -195,7 +194,7 @@ int ren_get_font_width(RenFont *font, const char *text) {
   while (*p) {
     p = utf8_to_codepoint(p, &codepoint);
     GlyphSet *set = get_glyphset(font, codepoint);
-    GlyphBitmapInfo *g = &set->glyphs[codepoint & 0xff];
+    FR_Bitmap_Glyph_Metrics *g = &set->glyphs[codepoint & 0xff];
     x += g->xadvance;
   }
   return x;
@@ -294,17 +293,14 @@ int ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color)
   const char *p = text;
   unsigned codepoint;
   SDL_Surface *surf = SDL_GetWindowSurface(window);
-  FontRendererColor color_fr = { .r = color.r, .g = color.g, .b = color.b };
+  FR_Color color_fr = { .r = color.r, .g = color.g, .b = color.b };
   while (*p) {
     p = utf8_to_codepoint(p, &codepoint);
     GlyphSet *set = get_glyphset(font, codepoint);
-    GlyphBitmapInfo *g = &set->glyphs[codepoint & 0xff];
+    FR_Bitmap_Glyph_Metrics *g = &set->glyphs[codepoint & 0xff];
     if (color.a != 0) {
-      FontRendererBlendGammaSubpixel(
-        font->renderer, &clip,
-        x, y,
-        (uint8_t *) surf->pixels, surf->w,
-        set->image, g, color_fr);
+      FR_Blend_Gamma_Subpixel(font->renderer, &clip,
+        x, y, (uint8_t *) surf->pixels, surf->w, set->image, g, color_fr);
     }
     x += g->xadvance;
   }