lots and lots of userspace stuff

9 files changed, 559 insertions, 209 deletions

diff --git a/libraries/daguerre/include/daguerre.hpp b/libraries/daguerre/include/daguerre.hpp
deleted file mode 100644
index 9468826..0000000
--- a/libraries/daguerre/include/daguerre.hpp
+++ /dev/null
@@ -1,209 +0,0 @@
-#pragma once
-
-#include <algorithm>
-#include <stdint.h>
-#include <cstring>
-#include <cstdio>
-
-namespace daguerre {
-
-  typedef uint32_t hilbert_color;
-
-  struct rgb24 {
-    uint8_t r;
-    uint8_t g;
-    uint8_t b;
-  };
-
-  template <class color_t>
-  static inline void default_overlay(color_t &dest, const color_t &src) {
-    dest = src;
-  }
-
-  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 {
-
-  public:
-    bool delete_buffer_on_destruct;
-    color_t *buffer;
-    unsigned width;
-    unsigned height;
-    unsigned pitch;//in sizeof(color_t)
-
-    image()
-    : delete_buffer_on_destruct(false), buffer(0), width(0), height(0),
-      pitch(0) {}
-
-    image(unsigned width, unsigned height)
-    : delete_buffer_on_destruct(true), buffer(new color_t[width * height]),
-      width(width), height(height), pitch(width) {}
-
-    image(
-      color_t *buffer, unsigned width, unsigned height, unsigned pitch,
-      bool delete_buffer_on_destruct)
-    : delete_buffer_on_destruct(delete_buffer_on_destruct), buffer(buffer),
-      width(width), height(height), pitch(pitch) {}
-
-    ~image() {
-      if (delete_buffer_on_destruct && buffer)
-        delete[] buffer;
-    }
-
-    template <class other_color_t,
-      void overlay(color_t &, const other_color_t &) = default_overlay>
-    image(const image<other_color_t> &other)
-    : delete_buffer_on_destruct(true),
-      buffer(new color_t[other.width * other.height]), width(other.width),
-      height(other.height), pitch(other.width) {
-      overlay_from<other_color_t, overlay>(other, 0, 0, 0, 0, width, height);
-    }
-
-    image(image<color_t> &&other)
-    : delete_buffer_on_destruct(other.delete_buffer_on_destruct),
-      buffer(other.buffer), width(other.width), height(other.height),
-      pitch(other.pitch) {
-      other.buffer = 0;
-    }
-
-    template <class other_color_t,
-      void overlay(color_t &, const other_color_t &) = default_overlay>
-    image<color_t> &operator =(const image<other_color_t> &other) {
-      if (delete_buffer_on_destruct && buffer)
-        delete[] buffer;
-      delete_buffer_on_destruct = true;
-      width = other.width;
-      height = other.height;
-      pitch = width;
-      buffer = new color_t[width * height];
-      overlay_from<other_color_t, overlay>(other, 0, 0, 0, 0, width, height);
-      return *this;
-    }
-
-    image<color_t> &operator =(image<color_t> &&other) {
-      if (delete_buffer_on_destruct && buffer)
-        delete[] buffer;
-      delete_buffer_on_destruct = other.delete_buffer_on_destruct;
-      buffer = other.buffer;
-      width = other.width;
-      height = other.height;
-      pitch = other.pitch;
-      other.buffer = 0;
-      return *this;
-    }
-
-    color_t get(unsigned x, unsigned y) const {
-      return buffer[y * pitch + x];
-    }
-
-    void set(unsigned x, unsigned y, const color_t &c) {
-      buffer[y * pitch + x] = c;
-    }
-
-    void copy_from(
-      const image<color_t> &other, unsigned to_x, unsigned to_y,
-      unsigned from_x, unsigned from_y, unsigned width, unsigned height) {
-
-      color_t *to_start = buffer + pitch * to_y + to_x;
-      const color_t *from_start = other.buffer + other.pitch * from_y + from_x;
-
-      for (unsigned y = 0; y < height; ++y)
-        std::memcpy(
-          to_start + pitch * y, from_start + other.pitch * y,
-          width * sizeof(color_t));
-
-    }
-
-    template <class other_color_t,
-      void overlay(color_t &, const other_color_t &) = default_overlay>
-    void overlay_from(
-      const image<other_color_t> &other, unsigned to_x, unsigned to_y,
-      unsigned from_x, unsigned from_y, unsigned width, unsigned height) {
-
-      color_t *to_start = buffer + pitch * to_y + to_x;
-      const other_color_t *from_start =
-        other.buffer + other.pitch * from_y + from_x;
-
-      for (unsigned y = 0; y < height; ++y)
-        for (unsigned x = 0; x < width; ++x)
-          overlay(to_start[pitch * y + x], from_start[other.pitch * y + x]);
-
-    }
-
-  };
-
-  template <class color_t>
-  void swap(image<color_t> &a, image<color_t> &b) {
-    std::swap(a.delete_buffer_on_destruct, b.delete_buffer_on_destruct);
-    std::swap(a.buffer, b.buffer);
-    std::swap(a.width, b.width);
-    std::swap(a.height, b.height);
-    std::swap(a.pitch, b.pitch);
-  }
-
-  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) {
-          target.template overlay_from<color_t, overlay>(
-            glyphs[ch], x, y, 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;
-  }
-
-}
diff --git a/libraries/daguerre/include/daguerre/fixed-font.hpp b/libraries/daguerre/include/daguerre/fixed-font.hpp
new file mode 100644
index 0000000..471163a
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/fixed-font.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <daguerre/general.hpp>
+
+//TODO: support more than just ascii
+
+namespace daguerre {
+
+  //forward declare since these depend on each other
+  template <class color_t>
+  class image;
+
+  template <class color_t>
+  class fixed_font {
+
+  public:
+    int glyph_width;
+    int glyph_height;
+    image<color_t> glyphs[128];
+
+    //initializes every glyph to an empty image
+    fixed_font();
+
+    //initializes each glyph to have the right dimensions and
+    //a valid buffer, but does nothing to their contents.
+    fixed_font(int glyph_width, int glyph_height);
+
+    //moves the other font's glyphs here, then
+    //sets the other font to have empty images.
+    fixed_font(fixed_font<color_t> &&other);
+
+    //moves the other font's glyphs here, then
+    //sets the other font to have empty images.
+    fixed_font<color_t> &operator =(fixed_font<color_t> &&other);
+
+    //use one of the two constructors below instead
+    fixed_font(const fixed_font<color_t> &other) = delete;
+
+    //copies the other font's images here, passing them through conversion.
+    template <class other_color_t>
+    fixed_font(const fixed_font<other_color_t> &other,
+      converter_t<color_t, other_color_t> *conversion = &default_conversion);
+
+    //directly calls memcpy on the images' buffers. the second argument
+    //does nothing except distinguish this from the other copy constructor.
+    fixed_font(const fixed_font<color_t> &other, bool);
+
+    //use copy constructor and move assignment instead
+    fixed_font<color_t> &operator =(const fixed_font<color_t> &other) = delete;
+
+    ~fixed_font() = default;
+
+  };
+
+}
+
+#include <daguerre/impl/fixed-font.hpp>
diff --git a/libraries/daguerre/include/daguerre/framebuffer.hpp b/libraries/daguerre/include/daguerre/framebuffer.hpp
new file mode 100644
index 0000000..c9a5226
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/framebuffer.hpp
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <daguerre/image.hpp>
+
+namespace daguerre {
+
+  image<hilbert_color> get_hilbert_framebuffer();
+
+}
diff --git a/libraries/daguerre/include/daguerre/general.hpp b/libraries/daguerre/include/daguerre/general.hpp
new file mode 100644
index 0000000..78c6919
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/general.hpp
@@ -0,0 +1,59 @@
+#pragma once
+
+#include <euler/syscall.hpp>
+#include <stdint.h>
+
+namespace daguerre {
+
+  typedef euler::syscall::encoded_color hilbert_color;
+
+  struct rgb24 {
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+  };
+
+  template <class dest_t, class src_t>
+  using converter_t = void (dest_t &, const src_t &);
+
+  //copies src to dest
+  template <class color_t>
+  static inline void default_conversion(color_t &dest, const color_t &src) {
+    dest = src;
+  }
+
+  //encodes src and copies that to dest
+  static inline void default_conversion(hilbert_color &dest, const rgb24 &src) {
+    dest = euler::syscall::encode_color(src.r, src.g, src.b);
+  }
+
+  template <class dest_t, class src_t, class param_t>
+  using param_converter_t = void (dest_t &, const src_t &, const param_t &);
+
+  //if src is true, copies param to dest.
+  //if src is false, does nothing.
+  template <class color_t>
+  static inline void default_conversion(
+    color_t &dest, const bool &src, const color_t &param) {
+    if (src)
+      dest = param;
+  }
+
+  //intersects [to, to + length) with [min, max) at stores the result in
+  //[to, to + length). if anything was removed from either end, the same
+  //amount is removed from the same end(s) of [from, from + length)
+  static inline void make_safe(
+    int &to, int &from, int &length, int min, int max) {
+
+    if (to < min) {
+      from += min - to;
+      length -= min - to;
+      to = min;
+    }
+
+    if (to + length > max)
+      length = max - to;
+
+  }
+
+}
diff --git a/libraries/daguerre/include/daguerre/image.hpp b/libraries/daguerre/include/daguerre/image.hpp
new file mode 100644
index 0000000..4c44dd0
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/image.hpp
@@ -0,0 +1,118 @@
+#pragma once
+
+#include <daguerre/general.hpp>
+
+namespace daguerre {
+
+  //forward declare since these depend on each other
+  template <class color_t>
+  class fixed_font;
+
+  template <class color_t>
+  class image {
+
+  public:
+    bool delete_buffer_on_destruct;
+    int width;
+    int height;
+    color_t *buffer;
+    int buffer_pitch;//in sizeof(color_t)
+
+    //makes empty image
+    image();
+
+    //make image with specified dimensions, contents uninitialized
+    image(int width, int height);
+
+    //make image with specified dimensions and buffer
+    image(
+      int width, int height, color_t *buffer,
+      int buffer_pitch, bool delete_buffer_on_destruct);
+
+    //moves the other image's data here, and
+    //then sets the other image to an empty one.
+    image(image<color_t> &&other);
+
+    //moves the other image's data here, and
+    //then sets the other image to an empty one.
+    image<color_t> &operator =(image<color_t> &&other);
+
+    //use one of the two constructors below instead
+    image(const image<color_t> &other) = delete;
+
+    //copies the other image's data here, passing it through conversion
+    template <class other_color_t>
+    image(const image<other_color_t> &other,
+      converter_t<color_t, other_color_t> *conversion = &default_conversion);
+
+    //directly calls memcpy on the buffer. the second argument does
+    //nothing except distinguish this from the other copy constructor.
+    image(const image<color_t> &other, bool);
+
+    //use copy constructor and move assignment instead
+    image<color_t> &operator =(const image<color_t> &other) = delete;
+
+    ~image();
+
+    void fill(const color_t &color);
+
+    //does not check bounds
+    color_t &at(int x, int y);
+
+    //does not check bounds
+    const color_t &at(int x, int y) const;
+
+    image<color_t> stretch(int new_width, int new_height);
+
+    //copies the region here via memcpy. does not check bounds.
+    void copy_from(
+      const image<color_t> &other, int to_x, int to_y,
+      int from_x, int from_y, int width, int height);
+
+    //copies the entire image here via memcpy. does not check bounds.
+    void copy_from(const image<color_t> &other, int to_x, int to_y);
+
+    //copies the region here through conversion. does not check bounds.
+    template <class other_color_t>
+    void convert_from(
+      const image<other_color_t> &other, int to_x, int to_y,
+      int from_x, int from_y, int width, int height,
+      converter_t<color_t, other_color_t> *conversion = &default_conversion);
+
+    //copies the entire image here through conversion. does not check bounds.
+    template <class other_color_t>
+    void convert_from(
+      const image<other_color_t> &other, int to_x, int to_y,
+      converter_t<color_t, other_color_t> *conversion = &default_conversion);
+
+    //copies the region here through conversion. does not check bounds.
+    template <class other_color_t, class param_t>
+    void convert_from(
+      const param_t &param, const image<other_color_t> &other, int to_x,
+      int to_y, int from_x, int from_y, int width, int height,
+      param_converter_t<color_t, other_color_t, param_t> *conversion =
+        &default_conversion);
+
+    //copies the entire image here through conversion. does not check bounds.
+    template <class other_color_t, class param_t>
+    void convert_from(const param_t &param,
+      const image<other_color_t> &other, int to_x, int to_y,
+      param_converter_t<color_t, other_color_t, param_t> *conversion =
+        &default_conversion);
+
+    //does not check bounds or wrap text
+    template <class font_color_t, class param_t>
+    void render_text(
+      const fixed_font<font_color_t> &font,
+      const param_t &pararm, int x, int y, const char *text,
+      param_converter_t<color_t, font_color_t, param_t> *conversion =
+        &default_conversion);
+
+  };
+
+  template <class color_t>
+  void swap(image<color_t> &a, image<color_t> &b);
+
+}
+
+#include <daguerre/impl/image.hpp>
diff --git a/libraries/daguerre/include/daguerre/impl/fixed-font.hpp b/libraries/daguerre/include/daguerre/impl/fixed-font.hpp
new file mode 100644
index 0000000..dbff798
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/impl/fixed-font.hpp
@@ -0,0 +1,59 @@
+#pragma once
+
+//this file should only be included from <daguerre/fixed-font.hpp>
+
+#include <daguerre/image.hpp>
+#include <utility>
+
+namespace daguerre {
+
+  template<class color_t>
+  fixed_font<color_t>::fixed_font() : glyph_width(0), glyph_height(0) {}
+
+  template <class color_t>
+  fixed_font<color_t>::fixed_font(int glyph_width, int glyph_height)
+  : glyph_width(glyph_width), glyph_height(glyph_height) {
+    for (int i = 0; i < 128; ++i)
+      glyphs[i] = image<color_t>(glyph_width, glyph_height);
+  }
+
+  template <class color_t>
+  fixed_font<color_t>::fixed_font(fixed_font<color_t> &&other)
+    : glyph_width(other.glyph_width), glyph_height(other.glyph_height) {
+      for (int i = 0; 0 < 128; ++i)
+        glyphs[i] = std::move(other.glyphs[i]);
+      other.glyph_width = 0;
+      other.glyph_height = 0;
+    }
+
+  template <class color_t>
+  fixed_font<color_t> &fixed_font<color_t>::operator =(
+    fixed_font<color_t> &&other) {
+    glyph_width = other.glyph_width;
+    glyph_height = other.glyph_height;
+    for (int i = 0; 0 < 128; ++i)
+      glyphs[i] = std::move(other.glyphs[i]);
+    other.glyph_width = 0;
+    other.glyph_height = 0;
+  }
+
+  template <class color_t>
+  template <class other_color_t>
+  fixed_font<color_t>::fixed_font(
+    const fixed_font<other_color_t> &other,
+    converter_t<color_t, other_color_t> *conversion)
+  : glyph_width(other.glyph_width), glyph_height(other.glyph_height) {
+    for (int i = 0; i < 128; ++i)
+      glyphs[i] = image<color_t>(other.glyphs[i], conversion);
+  }
+
+  template <class color_t>
+  fixed_font<color_t>::fixed_font(const fixed_font<color_t> &other, bool)
+  : glyph_width(other.glyph_width), glyph_height(other.glyph_height) {
+    for (int i = 0; i < 128; ++i)
+      glyphs[i] = image<color_t>(other.glyphs[i], true);
+  }
+
+}
+
+#include <daguerre/image.hpp>
diff --git a/libraries/daguerre/include/daguerre/impl/image.hpp b/libraries/daguerre/include/daguerre/impl/image.hpp
new file mode 100644
index 0000000..1264879
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/impl/image.hpp
@@ -0,0 +1,217 @@
+#pragma once
+
+//this file should only be included from <daguerre/image.hpp>
+
+#include <daguerre/fixed-font.hpp>
+#include <algorithm>
+#include <cstring>
+
+namespace daguerre {
+
+  template <class color_t>
+  image<color_t>::image()
+  : delete_buffer_on_destruct(false), width(0),
+      height(0), buffer(0), buffer_pitch(0) {}
+
+  template <class color_t>
+  image<color_t>::image(int width, int height)
+  : delete_buffer_on_destruct(true), width(width), height(height),
+    buffer(new color_t[width * height]), buffer_pitch(width) {}
+
+  template <class color_t>
+  image<color_t>::image(
+    int width, int height, color_t *buffer,
+    int buffer_pitch, bool delete_buffer_on_destruct)
+  : delete_buffer_on_destruct(delete_buffer_on_destruct), width(width),
+    height(height), buffer(buffer), buffer_pitch(buffer_pitch) {}
+
+  template <class color_t>
+  image<color_t>::image(image<color_t> &&other)
+  : delete_buffer_on_destruct(other.delete_buffer_on_destruct),
+    width(other.width), height(other.height), buffer(other.buffer),
+    buffer_pitch(other.buffer_pitch) {
+
+    other.width = 0;
+    other.height = 0;
+    other.buffer = 0;
+
+  }
+
+  template<class color_t>
+  image<color_t> &image<color_t>::operator =(image<color_t> &&other) {
+
+    if (delete_buffer_on_destruct && buffer)
+      delete[] buffer;
+
+    delete_buffer_on_destruct = other.delete_buffer_on_destruct;
+    width = other.width;
+    height = other.height;
+    buffer = other.buffer;
+    buffer_pitch = other.buffer_pitch;
+
+    other.width = 0;
+    other.height = 0;
+    other.buffer = 0;
+
+    return *this;
+
+  }
+
+  template <class color_t>
+  template <class other_color_t>
+  image<color_t>::image(const image<other_color_t> &other,
+    converter_t<color_t, other_color_t> *conversion)
+  : delete_buffer_on_destruct(true), width(other.width),
+    height(other.height), buffer(new color_t[other.width * other.height]),
+    buffer_pitch(other.width) {
+
+    for (int y = 0; y < height; ++y)
+      for (int x = 0; x < width; ++x)
+        conversion(
+          buffer[y * buffer_pitch + x],
+          other.buffer[y * other.buffer_pitch + x]);
+
+  }
+
+  template <class color_t>
+  image<color_t>::image(const image<color_t> &other, bool)
+  : delete_buffer_on_destruct(true), width(width), height(other.height),
+    buffer(new color_t[other.width * other.height]),
+    buffer_pitch(other.width) {
+
+    if (buffer_pitch == other.buffer_pitch)
+      memcpy(buffer, other.buffer, (height - 1) * buffer_pitch + width);
+
+    else
+      for (int y = 0; y < height; ++y)
+        memcpy(buffer + y * buffer_pitch,
+          other.buffer + y * other.buffer_pitch,
+          sizeof(color_t) * width);
+
+  }
+
+  template <class color_t>
+  image<color_t>::~image() {
+    if (delete_buffer_on_destruct && buffer)
+      delete[] buffer;
+  }
+
+  template <class color_t>
+  void image<color_t>::fill(const color_t &color) {
+    for (int y = 0; y < height; ++y)
+      for (int x = 0; x < width; ++x)
+        buffer[y * buffer_pitch + x] = color;
+  }
+
+  template <class color_t>
+  color_t &image<color_t>::at(int x, int y) {
+    return buffer[y * buffer_pitch + x];
+  }
+
+  template <class color_t>
+  const color_t &image<color_t>::at(int x, int y) const {
+    return buffer[y * buffer_pitch + x];
+  }
+
+  template <class color_t>
+  image<color_t> image<color_t>::stretch(int new_width, int new_height) {
+    image<color_t> im(new_width, new_height);
+    for (int y = 0; y < new_height; ++y)
+      for (int x = 0; x < new_width; ++x)
+        im.at(x, y) = at(x * width / new_width, y * height / new_height);
+    return im;
+  }
+
+  template <class color_t>
+  void image<color_t>::copy_from(
+    const image<color_t> &other, int to_x, int to_y,
+    int from_x, int from_y, int width, int height) {
+
+    color_t *to = buffer + to_y * buffer_pitch + to_x;
+    const color_t *from = other.buffer + from_y * other.buffer_pitch + from_x;
+
+    for (int y = 0; y < height; ++y)
+      memcpy(
+        to + y * buffer_pitch,
+        from + y * other.buffer_pitch,
+        width * sizeof(color_t));
+
+  }
+
+  template <class color_t>
+  void image<color_t>::copy_from(
+    const image<color_t> &other, int to_x, int to_y) {
+    copy_from(other, to_x, to_y, 0, 0, other.width, other.height);
+  }
+
+  template <class color_t>
+  template <class other_color_t>
+  void image<color_t>::convert_from(
+    const image<other_color_t> &other, int to_x, int to_y,
+    int from_x, int from_y, int width, int height,
+    converter_t<color_t, other_color_t> *conversion) {
+
+    for (int y = 0; y < height; ++y)
+      for (int x = 0; x < width; ++x)
+        conversion(at(to_x + x, to_y + y), other.at(from_x + x, from_y + y));
+
+  }
+
+  template <class color_t>
+  template <class other_color_t>
+  void image<color_t>::convert_from(
+    const image<other_color_t> &other, int to_x, int to_y,
+    converter_t<color_t, other_color_t> *conversion) {
+    convert_from(other, to_x, to_y, 0, 0, other.width, other.y, conversion);
+  }
+
+  template <class color_t>
+  template <class other_color_t, class param_t>
+  void image<color_t>::convert_from(
+    const param_t &param, const image<other_color_t> &other, int to_x,
+    int to_y, int from_x, int from_y, int width, int height,
+    param_converter_t<color_t, other_color_t, param_t> *conversion) {
+
+    for (int y = 0; y < height; ++y)
+      for (int x = 0; x < width; ++x)
+        conversion(
+          at(to_x + x, to_y + y), other.at(from_x + x, from_y + y), param);
+
+  }
+
+  template <class color_t>
+  template <class other_color_t, class param_t>
+  void image<color_t>::convert_from(
+    const param_t &param, const image<other_color_t> &other, int to_x,
+    int to_y, param_converter_t<color_t, other_color_t, param_t> *conversion) {
+    convert_from(
+      param, other, to_x, to_y, 0, 0, other.width, other.y, conversion);
+  }
+
+  template <class color_t>
+  template <class font_color_t, class param_t>
+  void image<color_t>::render_text(
+    const fixed_font<font_color_t> &font,
+    const param_t &param, int x, int y, const char *text,
+    param_converter_t<color_t, font_color_t, param_t> *conversion) {
+
+    while (*text) {
+      int ch = *text;
+      if (ch >= 0 && ch < 128)
+        convert_from(param, font.glyphs[ch], x, y, conversion);
+      ++text;
+      x += font.glyph_width;
+    }
+
+  }
+
+  template <class color_t>
+  void swap(image<color_t> &a, image<color_t> &b) {
+    std::swap(a.delete_buffer_on_destruct, b.delete_buffer_on_destruct);
+    std::swap(a.width, b.width);
+    std::swap(a.height, b.height);
+    std::swap(a.buffer, b.buffer);
+    std::swap(a.buffer_pitch, b.buffer_pitch);
+  }
+
+}
diff --git a/libraries/daguerre/include/daguerre/ppm.hpp b/libraries/daguerre/include/daguerre/ppm.hpp
new file mode 100644
index 0000000..5249c98
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/ppm.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <daguerre/image.hpp>
+#include <optional>
+#include <cstdio>
+
+namespace daguerre {
+
+  std::optional<image<rgb24>> try_load_ppm(FILE *input);
+
+  static inline std::optional<image<rgb24>> try_load_ppm(const char *path) {
+    FILE *f = fopen(path, "r");
+    if (!f)
+      return {};
+    auto result = try_load_ppm(f);
+    fclose(f);
+    return result;
+  }
+
+}
diff --git a/libraries/daguerre/include/daguerre/psf.hpp b/libraries/daguerre/include/daguerre/psf.hpp
new file mode 100644
index 0000000..e38cdc4
--- /dev/null
+++ b/libraries/daguerre/include/daguerre/psf.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <daguerre/fixed-font.hpp>
+#include <optional>
+#include <cstdio>
+
+namespace daguerre {
+
+  std::optional<fixed_font<bool>> try_load_psf(FILE *input);
+
+  static inline std::optional<fixed_font<bool>> try_load_psf(const char *path) {
+    FILE *f = fopen(path, "r");
+    if (!f)
+      return {};
+    auto result = try_load_psf(f);
+    fclose(f);
+    return result;
+  }
+
+}