add FilterLevel API to SkPaint, replacing various Flag bits

src/core/SkPaint.cpp

Index: src/core/SkPaint.cpp
diff --git a/src/core/SkPaint.cpp b/src/core/SkPaint.cpp
index 886794c479702e18a9c7cc3c0de2df6c69f3ae38..372e68051e76b90b62c0d9c1598cfd30d7ee882c 100644
--- a/src/core/SkPaint.cpp
+++ b/src/core/SkPaint.cpp
@@ -205,6 +205,29 @@ void SkPaint::setPaintOptionsAndroid(const SkPaintOptionsAndroid& options) {
 }
 #endif
 
+SkPaint::FilterLevel SkPaint::getFilterLevel() const {
+    int level = 0;
+    if (fFlags & kFilterBitmap_Flag) {
+        level |= 1;
+    }
+    if (fFlags & kHighQualityFilterBitmap_Flag) {
+        level |= 2;
+    }
+    return (FilterLevel)level;
+}
+
+void SkPaint::setFilterLevel(FilterLevel level) {
+    unsigned mask = kFilterBitmap_Flag | kHighQualityFilterBitmap_Flag;
+    unsigned flags = 0;
+    if (level & 1) {
+        flags |= kFilterBitmap_Flag;
+    }
+    if (level & 2) {
+        flags |= kHighQualityFilterBitmap_Flag;
+    }
+    this->setFlags((fFlags & ~mask) | flags);
+}
+
 void SkPaint::setHinting(Hinting hintingLevel) {
     GEN_ID_INC_EVAL((unsigned) hintingLevel != fHinting);
     fHinting = hintingLevel;
@@ -263,10 +286,6 @@ void SkPaint::setDevKernText(bool doDevKern) {
     this->setFlags(SkSetClearMask(fFlags, doDevKern, kDevKernText_Flag));
 }
 
-void SkPaint::setFilterBitmap(bool doFilter) {
-    this->setFlags(SkSetClearMask(fFlags, doFilter, kFilterBitmap_Flag));
-}
-
 void SkPaint::setStyle(Style style) {
     if ((unsigned)style < kStyleCount) {
         GEN_ID_INC_EVAL((unsigned)style != fStyle);