remove dst/rendertarget support for kARGB_4444_Config

src/effects/SkTransparentShader.cpp

Index: src/effects/SkTransparentShader.cpp
diff --git a/src/effects/SkTransparentShader.cpp b/src/effects/SkTransparentShader.cpp
index 7b92fde6dbbfcec15584e17dd9c8aeb7f02aef4e..0274481623f275b848fbe3771426546613a31a91 100644
--- a/src/effects/SkTransparentShader.cpp
+++ b/src/effects/SkTransparentShader.cpp
@@ -30,7 +30,6 @@ uint32_t SkTransparentShader::getFlags() {
                 flags |= kOpaqueAlpha_Flag;
             break;
         case SkBitmap::kARGB_8888_Config:
-        case SkBitmap::kARGB_4444_Config:
             if (fAlpha == 255 && fDevice->isOpaque())
                 flags |= kOpaqueAlpha_Flag;
             break;
@@ -79,21 +78,6 @@ void SkTransparentShader::shadeSpan(int x, int y, SkPMColor span[], int count) {
             }
             break;
         }
-        case SkBitmap::kARGB_4444_Config: {
-            const uint16_t* src = fDevice->getAddr16(x, y);
-            if (scale == 256) {
-                for (int i = count - 1; i >= 0; --i) {
-                    span[i] = SkPixel4444ToPixel32(src[i]);
-                }
-            } else {
-                unsigned scale16 = scale >> 4;
-                for (int i = count - 1; i >= 0; --i) {
-                    uint32_t c = SkExpand_4444(src[i]) * scale16;
-                    span[i] = SkCompact_8888(c);
-                }
-            }
-            break;
-        }
         case SkBitmap::kIndex8_Config:
             SkDEBUGFAIL("index8 not supported as a destination device");
             break;