From: Ingo Ruhnke <grumbel@gmail.com>
Date: Mon, 4 Aug 2014 19:02:04 +0000 (+0200)
Subject: Added 1-pixel transparent border around glyphs to avoid GL blending artifacts when... 
X-Git-Url: https://git.octo.it/?p=supertux.git;a=commitdiff_plain;h=8fc619c1560d238cbf22fb666847642a130516c6

Added 1-pixel transparent border around glyphs to avoid GL blending artifacts when scaling along with a script for doing so

Only while.stf has been converted so far
---

diff --git a/data/fonts/white.stf b/data/fonts/white.stf
index 262cd0c6b..3668d824f 100644
--- a/data/fonts/white.stf
+++ b/data/fonts/white.stf
@@ -1,6 +1,7 @@
 (supertux-font
   (glyph-width 16)
   (glyph-height 18)
+  (glyph-border 1)
   (surface
     (glyphs "white.png")
     (shadows "shadow.png")
diff --git a/data/images/engine/fonts/shadow.png b/data/images/engine/fonts/shadow.png
index 5ca06bbdc..ce1130e2b 100644
Binary files a/data/images/engine/fonts/shadow.png and b/data/images/engine/fonts/shadow.png differ
diff --git a/data/images/engine/fonts/white.png b/data/images/engine/fonts/white.png
index af453f863..577de6aaf 100644
Binary files a/data/images/engine/fonts/white.png and b/data/images/engine/fonts/white.png differ
diff --git a/src/video/font.cpp b/src/video/font.cpp
index 00b7ec1e1..f3ce6353d 100644
--- a/src/video/font.cpp
+++ b/src/video/font.cpp
@@ -62,6 +62,7 @@ Font::Font(GlyphWidth glyph_width_,
   shadow_surfaces(),
   char_height(),
   shadowsize(shadowsize_),
+  border(0),
   glyphs(65536)
 {
   for(unsigned int i=0; i<65536;i++) glyphs[i].surface_idx = -1;
@@ -106,6 +107,8 @@ Font::loadFontFile(const std::string &filename)
     throw std::runtime_error(msg.str());
   }
 
+  config_l->get("glyph-border", border);
+
   lisp::ListIterator iter(config_l);
   while(iter.next()) {
     const std::string& token = iter.item();
@@ -190,8 +193,8 @@ Font::loadFontSurface(
 
   for( unsigned int i = 0; i < chars.size(); i++) {
     for(UTF8Iterator chr(chars[i]); !chr.done(); ++chr) {
-      int y = row * char_height;
-      int x = col * char_width;
+      int y = row * (char_height + 2*border) + border;
+      int x = col * (char_width + 2*border) + border;
       if( ++col == wrap ) { col=0; row++; }
       if( *chr == 0x0020 && glyphs[0x20].surface_idx != -1) continue;
         
diff --git a/src/video/font.hpp b/src/video/font.hpp
index 4704d76be..513e0d091 100644
--- a/src/video/font.hpp
+++ b/src/video/font.hpp
@@ -137,6 +137,7 @@ private:
   std::vector<SurfacePtr>  shadow_surfaces;
   int char_height;
   int shadowsize;
+  int border;
 
   /** 65536 of glyphs */
   std::vector<Glyph> glyphs;
diff --git a/tools/font-add-border.py b/tools/font-add-border.py
new file mode 100755
index 000000000..a57e7e06e
--- /dev/null
+++ b/tools/font-add-border.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+# SuperTux
+# Copyright (C) 2014 Ingo Ruhnke <grumbel@gmx.de>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from PIL import Image
+import sys
+import argparse
+
+# Add a 1 pixel border around every glyph in a font
+
+def fix_font_file(filename, glyph_width, glyph_height):
+    print("Processing %s %dx%d" % (filename, glyph_width, glyph_height))
+    img = Image.open(filename)
+    w, h = img.size
+    
+    assert w % glyph_width == 0, "image not multiple of glyph width"
+    assert h % glyph_height == 0, "image not multiple of glyph height"
+
+    w_g = w // glyph_width
+    h_g = h // glyph_height
+
+    print("Glyphs: %ax%a" % (w_g, h_g))
+
+    out = Image.new("RGBA", (w_g * (glyph_width + 2), h_g * (glyph_height + 2)), color=5)
+
+    for y in range(0, h_g):
+        for x in range(0, w_g):
+            ix = x * glyph_width
+            iy = y * glyph_height
+
+            ox = x * (glyph_width + 2) + 1
+            oy = y * (glyph_height + 2) + 1
+
+            glyph = img.crop((ix, iy, ix + glyph_width, iy + glyph_height))
+            out.paste(glyph, (ox, oy))
+
+    out.save("/tmp/out.png")
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='rFactor MAS packer')
+    parser.add_argument('FILE', action='store', type=str,
+                        help='font image to change')
+
+    parser.add_argument('GLYPH_WIDTH', action='store', type=int,
+                        help='glyph width')
+
+    parser.add_argument('GLYPH_HEIGHT', action='store', type=int,
+                        help='glyph height')
+
+    args = parser.parse_args()
+
+    fix_font_file(args.FILE, args.GLYPH_WIDTH, args.GLYPH_HEIGHT)
+
+# EOF #