Add option to embed font data into executable.

Some tools would like to be built with all resources embedded.
This change makes it possible to build a font manager which
uses font data embedded into the executable.

Review URL: https://codereview.chromium.org/1015723004

1 files changed, 80 insertions, 0 deletions

diff --git a/tools/embed_resources.py b/tools/embed_resources.py
new file mode 100644
index 0000000000..56d5982202
--- /dev/null
+++ b/tools/embed_resources.py
@@ -0,0 +1,80 @@
+#!/usr/bin/python
+
+'''
+Copyright 2015 Google Inc.
+
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+'''
+
+import argparse
+
+
+def bytes_from_file(f, chunksize=8192):
+  while True:
+    chunk = f.read(chunksize)
+    if chunk:
+      for b in chunk:
+        yield ord(b)
+    else:
+      break
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      formatter_class=argparse.RawDescriptionHelpFormatter,
+      description='Convert resource files to embedded read only data.',
+      epilog='''The output (when compiled and linked) can be used as:
+struct SkEmbeddedResource {const uint8_t* data; const size_t size;};
+struct SkEmbeddedHeader {const SkEmbeddedResource* entries; const int count;};
+extern "C" SkEmbeddedHeader const NAME;''')
+  parser.add_argument('--align', default=1, type=int,
+                      help='minimum alignment (in bytes) of resource data')
+  parser.add_argument('--name', default='_resource', type=str,
+                      help='the name of the c identifier to export')
+  parser.add_argument('--input', required=True, type=argparse.FileType('rb'),
+                      nargs='+', help='list of resource files to embed')
+  parser.add_argument('--output', required=True, type=argparse.FileType('w'),
+                      help='the name of the cpp file to output')
+  args = parser.parse_args()
+
+  out = args.output.write;
+  out('#include "SkTypes.h"\n')
+
+  # Write the resources.
+  index = 0
+  for f in args.input:
+    out('static const uint8_t resource{0:d}[] SK_STRUCT_ALIGN({1:d}) = {{\n'
+        .format(index, args.align))
+    bytes_written = 0
+    bytes_on_line = 0
+    for b in bytes_from_file(f):
+      out(hex(b) + ',')
+      bytes_written += 1
+      bytes_on_line += 1
+      if bytes_on_line >= 32:
+        out('\n')
+        bytes_on_line = 0
+    out('};\n')
+    out('static const size_t resource{0:d}_size = {1:d};\n'
+        .format(index, bytes_written))
+    index += 1
+
+  # Write the resource entries.
+  out('struct SkEmbeddedResource { const uint8_t* d; const size_t s; };\n')
+  out('static const SkEmbeddedResource header[] = {\n')
+  index = 0
+  for f in args.input:
+    out('  {{ resource{0:d}, resource{0:d}_size }},\n'.format(index))
+    index += 1
+  out('};\n')
+  out('static const int header_count = {0:d};\n'.format(index))
+
+  # Export the resource header.
+  out('struct SkEmbeddedHeader {const SkEmbeddedResource* e; const int c;};\n')
+  out('extern "C" const SkEmbeddedHeader {0:s} = {{ header, header_count }};\n'
+      .format(args.name))
+
+
+if __name__ == "__main__":
+  main()