add encode/decode options for bitmap fonts

src/ImageEncoder.cc

@@ -1,5 +1,6 @@
-#include "GVMEncoder.hh"
+#include "ImageEncoder.hh"
 
+#include <array>
 #include <phosg/Encoding.hh>
 #include <phosg/Image.hh>
 #include <phosg/Strings.hh>
@@ -34,7 +35,7 @@ struct GVRHeader {
   be_uint16_t height;
 } __packed_ws__(GVRHeader, 0x10);
 
-string encode_gvm(const phosg::Image& img, GVRDataFormat data_format, const std::string& internal_name, uint32_t global_index) {
+string encode_gvm(const phosg::Image& img, GVRDataFormat data_format, const string& internal_name, uint32_t global_index) {
   int8_t dimensions_field = -2;
   {
     size_t h = img.get_height();
@@ -111,3 +112,48 @@ string encode_gvm(const phosg::Image& img, GVRDataFormat data_format, const std:
 
   return std::move(w.str());
 }
+
+static const array<uint32_t, 4> fon_colors = {0x000000FF, 0x555555FF, 0xAAAAAAFF, 0xFFFFFFFF};
+
+phosg::Image decode_fon(const string& data, size_t width) {
+  size_t num_pixels = data.size() * 4;
+  size_t height = num_pixels / width;
+  phosg::Image ret(width, height);
+
+  phosg::BitReader r(data);
+  for (size_t y = 0; y < height; y++) {
+    for (size_t x = 0; x < width; x++) {
+      ret.write_pixel(x, y, fon_colors[r.read(2)]);
+    }
+  }
+  return ret;
+}
+
+constexpr size_t uabs(size_t a, size_t b) {
+  return (a > b) ? (a - b) : (b - a);
+}
+
+string encode_fon(const phosg::Image& img) {
+  phosg::BitWriter w;
+  for (size_t y = 0; y < img.get_height(); y++) {
+    for (size_t x = 0; x < img.get_width(); x++) {
+      uint32_t color = img.read_pixel(x, y);
+
+      size_t result_delta = 0x400;
+      size_t result_index = 0;
+      for (size_t z = 0; z < 4; z++) {
+        size_t delta = uabs((fon_colors[z] >> 24) & 0xFF, (color >> 24) & 0xFF) +
+            uabs((fon_colors[z] >> 16) & 0xFF, (color >> 16) & 0xFF) +
+            uabs((fon_colors[z] >> 8) & 0xFF, (color >> 8) & 0xFF) +
+            uabs(fon_colors[z] & 0xFF, color & 0xFF);
+        if (delta < result_delta) {
+          result_delta = delta;
+          result_index = z;
+        }
+      }
+      w.write(result_index & 2);
+      w.write(result_index & 1);
+    }
+  }
+  return w.str();
+}

src/ImageEncoder.hh

@@ -20,6 +20,8 @@ enum class GVRDataFormat : uint8_t {
 };
 
 std::string encode_gvm(const phosg::Image& img, GVRDataFormat data_format, const std::string& internal_name, uint32_t global_index);
+phosg::Image decode_fon(const std::string& data, size_t width);
+std::string encode_fon(const phosg::Image& img);
 
 constexpr uint16_t encode_rgb565(uint8_t r, uint8_t g, uint8_t b) {
   return ((r << 8) & 0xF800) | ((g << 3) & 0x07E0) | ((b >> 3) & 0x001F);

src/Main.cc

@@ -29,9 +29,9 @@
 #include "DNSServer.hh"
 #include "DownloadSession.hh"
 #include "GSLArchive.hh"
-#include "GVMEncoder.hh"
 #include "HTTPServer.hh"
 #include "IPStackSimulator.hh"
+#include "ImageEncoder.hh"
 #include "Loggers.hh"
 #include "NetworkAddresses.hh"
 #include "PSOGCObjectGraph.hh"
@@ -1120,6 +1120,36 @@ Action a_encode_gvm(
       write_output_data(args, encoded.data(), encoded.size(), "gvm");
     });
 
+Action a_decode_bitmap_font(
+    "decode-bitmap-font", "\
+  decode-bitmap-font --width=WIDTH [INPUT-FILENAME [OUTPUT-FILENAME]]\n\
+    Decode a 2-bit bitmap font file (.fon) into a BMP image. The --width\n\
+    option is required; if the output looks wrong, try increasing or\n\
+    decreasing this number. For S18all04.fon, the width should be 20.\n",
+    +[](phosg::Arguments& args) {
+      std::string data = read_input_data(args);
+      size_t width = args.get<size_t>("width");
+      std::string bmp_data = decode_fon(data, width).save(phosg::Image::Format::WINDOWS_BITMAP);
+      write_output_data(args, bmp_data.data(), bmp_data.size(), "bmp");
+    });
+Action a_encode_bitmap_font(
+    "encode-bitmap-font", "\
+  encode-bitmap-font [INPUT-FILENAME [OUTPUT-FILENAME]]\n\
+    Encode an image in BMP or PPM/PNM format into a bitmap font file for use\n\
+    with the console PSO versions. The image dimensions must match the\n\
+    original fon\'s dimensions.\n",
+    +[](phosg::Arguments& args) {
+      const string& input_filename = args.get<string>(1, false);
+      phosg::Image img;
+      if (!input_filename.empty() && (input_filename != "-")) {
+        img = phosg::Image(input_filename);
+      } else {
+        img = phosg::Image(stdin);
+      }
+      string encoded = encode_fon(img);
+      write_output_data(args, encoded.data(), encoded.size(), "fon");
+    });
+
 Action a_salvage_gci(
     "salvage-gci", "\
   salvage-gci INPUT-FILENAME [--round2] [CRYPT-OPTION] [--bytes=SIZE]\n\

src/ProxyCommands.cc

@@ -30,7 +30,7 @@
 
 #include "ChatCommands.hh"
 #include "Compression.hh"
-#include "GVMEncoder.hh"
+#include "ImageEncoder.hh"
 #include "Loggers.hh"
 #include "PSOProtocol.hh"
 #include "ReceiveCommands.hh"

src/ServerState.cc

@@ -11,8 +11,8 @@
 #include "Compression.hh"
 #include "EventUtils.hh"
 #include "FileContentsCache.hh"
-#include "GVMEncoder.hh"
 #include "IPStackSimulator.hh"
+#include "ImageEncoder.hh"
 #include "Loggers.hh"
 #include "NetworkAddresses.hh"
 #include "SendCommands.hh"

src/TeamIndex.cc

@@ -5,7 +5,7 @@
 #include <phosg/Random.hh>
 
 #include "BattleParamsIndex.hh"
-#include "GVMEncoder.hh"
+#include "ImageEncoder.hh"
 #include "ItemData.hh"
 #include "Loggers.hh"
 #include "StaticGameData.hh"