add font loading and rendering to daguerre

1 files changed, 63 insertions, 5 deletions

diff --git a/libraries/daguerre/include/daguerre.hpp b/libraries/daguerre/include/daguerre.hpp
index 62d10f0..c236cb9 100644
--- a/libraries/daguerre/include/daguerre.hpp
+++ b/libraries/daguerre/include/daguerre.hpp
@@ -14,6 +14,16 @@ namespace daguerre {
     uint8_t b;
   };
 
+  static inline void default_overlay(hilbert_color &dest, const rgb24 &src) {
+    dest = __euler_encode_color(src.r, src.g, src.b);
+  }
+
+  static inline void default_overlay(rgb24 &dest, const bool &src) {
+    dest.r = src ? 255 : 0;
+    dest.g = src ? 255 : 0;
+    dest.b = src ? 255 : 0;
+  }
+
   template <class color_t>
   class image {
 
@@ -100,7 +110,7 @@ namespace daguerre {
   //from [from_x, from_x + width) x [from_y, from_y + height).
   template <
     class to_color_t, class from_color_t,
-    void overlay(to_color_t &dest, const from_color_t &src)>
+    void overlay(to_color_t &dest, const from_color_t &src) = default_overlay>
   void overlay_region(
     image<to_color_t> &to, unsigned to_x, unsigned to_y,
     const image<from_color_t> &from, unsigned from_x, unsigned from_y,
@@ -116,12 +126,60 @@ namespace daguerre {
 
   }
 
-  static inline void encode(hilbert_color &dest, const rgb24 &src) {
-    dest = __euler_encode_color(src.r, src.g, src.b);
-  }
-
   image<hilbert_color> get_hilbert_framebuffer();
 
   bool try_load_ppm(std::FILE *input, image<rgb24> &into);
 
+  static inline bool try_load_ppm(const char *path, image<rgb24> &into) {
+    std::FILE *f = std::fopen(path, "r");
+    if (!f)
+      return false;
+    bool success = try_load_ppm(f, into);
+    std::fclose(f);
+    return success;
+  }
+
+  //TODO: unicode
+  template <class color_t>
+  class fixed_bitmap_font {
+
+  public:
+    unsigned width;
+    unsigned height;
+    image<color_t> glyphs[128];
+
+    template <class target_color_t,
+      void overlay(target_color_t &dest, const color_t &src) = default_overlay>
+    void overlay_text(
+      image<target_color_t> &target, unsigned x,
+      unsigned y, const char *text) const {
+
+      while (1) {
+        uint8_t ch = (uint8_t)*text;
+        if (ch == 0)
+          return;
+        if (ch < 128) {
+          overlay_region<target_color_t, color_t, overlay>(
+            target, x, y, glyphs[ch], 0, 0, width, height);
+          x += width;
+        }
+        ++text;
+      }
+
+    }
+
+  };
+
+  bool try_load_psf(std::FILE *input, fixed_bitmap_font<bool> &into);
+
+  static inline bool try_load_psf(
+    const char *path, fixed_bitmap_font<bool> &into) {
+    std::FILE *f = std::fopen(path, "r");
+    if (!f)
+      return false;
+    bool success = try_load_psf(f, into);
+    std::fclose(f);
+    return success;
+  }
+
 }