Make skpinfo able to inspect SK_PICT_TYPEFACE_TAG blocks

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1732263003

BUG=skia:4691

Review URL: https://codereview.chromium.org/1732263003

1 files changed, 17 insertions, 3 deletions

diff --git a/tools/skpinfo.cpp b/tools/skpinfo.cpp
index c7fd8c8708..4b65cb8a8c 100644
--- a/tools/skpinfo.cpp
+++ b/tools/skpinfo.cpp
@@ -9,6 +9,7 @@
 #include "SkPicture.h"
 #include "SkPictureData.h"
 #include "SkStream.h"
+#include "SkFontDescriptor.h"
 
 DEFINE_string2(input, i, "", "skp on which to report");
 DEFINE_bool2(version, v, true, "version");
@@ -107,13 +108,26 @@ int tool_main(int argc, char** argv) {
                 SkDebugf("SK_PICT_FACTORY_TAG %d\n", chunkSize);
             }
             break;
-        case SK_PICT_TYPEFACE_TAG:
+        case SK_PICT_TYPEFACE_TAG: {
             if (FLAGS_tags && !FLAGS_quiet) {
                 SkDebugf("SK_PICT_TYPEFACE_TAG %d\n", chunkSize);
-                SkDebugf("Exiting early due to format limitations\n");
             }
-            return kSuccess;       // TODO: need to store size in bytes
+
+            const int count = SkToInt(chunkSize);
+            for (int i = 0; i < count; i++) {
+                SkFontDescriptor desc;
+                if (!SkFontDescriptor::Deserialize(&stream, &desc)) {
+                    if (!FLAGS_quiet) {
+                        SkDebugf("File corruption in SkFontDescriptor\n");
+                    }
+                    return kInvalidTag;
+                }
+            }
+
+            // clear this since we've consumed all the typefaces
+            chunkSize = 0;
             break;
+        }
         case SK_PICT_PICTURE_TAG:
             if (FLAGS_tags && !FLAGS_quiet) {
                 SkDebugf("SK_PICT_PICTURE_TAG %d\n", chunkSize);