introduce Props to surface

src/core/SkBitmapDevice.cpp

Index: src/core/SkBitmapDevice.cpp
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 2711004aef14de4fbda9fbe12f2c74b171acdfa5..04009c92147e50b82e7174cce6dc9fd75dd64e65 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -374,20 +374,20 @@ SkImageFilter::Cache* SkBitmapDevice::getImageFilterCache() {
 
 ///////////////////////////////////////////////////////////////////////////////
 
+// Our current blitters only work on 32bit targets.
+static bool supports_lcd(const SkBitmap& target) {
+    return kN32_SkColorType == target.colorType();
+}
+
 bool SkBitmapDevice::filterTextFlags(const SkPaint& paint, TextFlags* flags) {
-    if (!paint.isLCDRenderText() || !paint.isAntiAlias()) {
-        // we're cool with the paint as is
-        return false;
+    uint32_t clearMask = 0;
+
+    if (paint.isLCDRenderText() && paint.isAntiAlias() && !supports_lcd(fBitmap)) {
+        clearMask |= SkPaint::kLCDRenderText_Flag;
     }
 
-    if (kN32_SkColorType != fBitmap.colorType() ||
-        paint.getRasterizer() ||
-        paint.getPathEffect() ||
-        paint.isFakeBoldText() ||
-        paint.getStyle() != SkPaint::kFill_Style ||
-        !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode)) {
-        // turn off lcd
-        flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag;
+    if (clearMask) {
+        flags->fFlags = paint.getFlags() & ~clearMask;
         flags->fHinting = paint.getHinting();
         return true;
     }