Suppress embedding fonts when the skp's fonts match the OS fonts.

The million SKPs generated require >5T of storage. A good deal
of that are copies of system fonts.

Chrome built with
#DEFINE SK_WHITELIST_SERIALIZED_TYPEFACES
will omit the font data if the font matches a precomputed
checksum.

The captured SKP prepends sk_ to the names of fonts that
have their data omitted. The SKP consumer can either add
renamed fonts from the recording machine, or add

gDeserializeTypefaceDelegate = WhitelistDeserializeTypeface;

which strips the sk_ prefix when deserializing typefaces.

whitelist_typefaces --check
Computes the checksums of fallback
fonts and returns 0 if the checksums match the checked-in
file SkWhitelistChecksum.cpp.

whitelist_typefaces --generate
Writes an updated version of SkWhitelistChecksum.cpp.

(Added Mike since this modifies a public header)

R=bungeman@google.com,rmistry@google.com,reed@google.com

Review URL: https://codereview.chromium.org/1317913005

1 files changed, 38 insertions, 0 deletions

diff --git a/tools/whitelist_typefaces.cpp b/tools/whitelist_typefaces.cpp
new file mode 100644
index 0000000000..205f54ac95
--- /dev/null
+++ b/tools/whitelist_typefaces.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkForceLinking.h"
+#include "SkGraphics.h"
+
+__SK_FORCE_IMAGE_DECODER_LINKING;
+
+extern bool CheckChecksums();
+extern bool GenerateChecksums();
+
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
+    if (argc == 2) {
+        SkAutoGraphics ag;  // Enable use of SkRTConfig
+        if (!strcmp(argv[1], "--check")) {
+            return (int) !CheckChecksums();
+        }
+        if (!strcmp(argv[1], "--generate")) {
+            if (!GenerateChecksums()) {
+                return 2;
+            }
+            return 0;
+        }
+    }
+    SkDebugf("Usage:\n %s [--check] [--generate]\n\n", argv[0]);
+    return 3;
+}
+
+#if !defined SK_BUILD_FOR_IOS
+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif