formalize named picture versions

BUG=skia:
R=mtklein@google.com, robertphillips@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/291913004

git-svn-id: http://skia.googlecode.com/svn/trunk@14807 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index 7ac2f07..f3bf01b 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2006 The Android Open Source Project
  *
@@ -2182,9 +2181,8 @@
     this->setStrokeMiter(read_scalar(pod));
     this->setColor(*pod++);
 
-    const int picVer = buffer.pictureVersion();
     unsigned flatFlags = 0;
-    if (picVer > 0 && picVer <= 22) {
+    if (buffer.isVersionLT(SkReadBuffer::kFilterLevelIsEnum_Version)) {
         flatFlags = unpack_paint_flags_v22(this, *pod++);
     } else {
         flatFlags = unpack_paint_flags(this, *pod++);
diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 87cd941..8c77eeb 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -534,7 +534,7 @@
 
             SkReadBuffer buffer(storage.get(), size);
             buffer.setFlags(pictInfoFlagsToReadBufferFlags(fInfo.fFlags));
-            buffer.setPictureVersion(fInfo.fVersion);
+            buffer.setVersion(fInfo.fVersion);
 
             fFactoryPlayback->setupBuffer(buffer);
             fTFPlayback.setupBuffer(buffer);
@@ -634,7 +634,7 @@
                                                        SkReadBuffer& buffer,
                                                        const SkPictInfo& info) {
     SkAutoTDelete<SkPicturePlayback> playback(SkNEW_ARGS(SkPicturePlayback, (picture, info)));
-    buffer.setPictureVersion(info.fVersion);
+    buffer.setVersion(info.fVersion);
 
     if (!playback->parseBuffer(picture, buffer)) {
         return NULL;
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index b4bc875..d016d9c 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -25,7 +25,7 @@
 
 SkReadBuffer::SkReadBuffer() {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     fMemoryPtr = NULL;
 
     fBitmapStorage = NULL;
@@ -43,7 +43,7 @@
 
 SkReadBuffer::SkReadBuffer(const void* data, size_t size) {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     fReader.setMemory(data, size);
     fMemoryPtr = NULL;
 
@@ -62,7 +62,7 @@
 
 SkReadBuffer::SkReadBuffer(SkStream* stream) {
     fFlags = default_flags();
-    fPictureVersion = 0;
+    fVersion = 0;
     const size_t length = stream->getLength();
     fMemoryPtr = sk_malloc_throw(length);
     stream->read(fMemoryPtr, length);
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index 6a418b6..9484db5 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -255,7 +255,7 @@
 SkColorShader::SkColorShader(SkReadBuffer& b) : INHERITED(b) {
     // V25_COMPATIBILITY_CODE We had a boolean to make the color shader inherit the paint's
     // color. We don't support that any more.
-    if (b.pictureVersion() < 26 && 0 != b.pictureVersion()) {
+    if (b.isVersionLT(SkReadBuffer::kColorShaderNoBool_Version)) {
         if (b.readBool()) {
             SkDEBUGFAIL("We shouldn't have pictures that recorded the inherited case.");
             fColor = SK_ColorWHITE;