Implement Fill() for incomplete decodes to RGBA_F16

src/codec/SkCodecPriv.h

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCodecPriv_DEFINED
 #define SkCodecPriv_DEFINED
 
 #include "SkColorPriv.h"
+#include "SkColorSpaceXform.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
 #include "SkTypes.h"
 
 #ifdef SK_PRINT_CODEC_MESSAGES
     #define SkCodecPrintf SkDebugf
 #else
     #define SkCodecPrintf(...)
 #endif
 
@@ skipping 117 matching lines @@
 /*
  * If there is a color table, get a pointer to the colors, otherwise return nullptr
  */
 static inline const SkPMColor* get_color_ptr(SkColorTable* colorTable) {
      return nullptr != colorTable ? colorTable->readColors() : nullptr;
 }
 
 /*
  * Given that the encoded image uses a color table, return the fill value
  */
-static inline uint32_t get_color_table_fill_value(SkColorType colorType, const SkPMColor* colorPtr,
-        uint8_t fillIndex) {
+static inline uint64_t get_color_table_fill_value(SkColorType colorType, SkAlphaType alphaType,
+        const SkPMColor* colorPtr, uint8_t fillIndex, SkColorSpaceXform* colorXform) {
     SkASSERT(nullptr != colorPtr);
     switch (colorType) {
         case kRGBA_8888_SkColorType:
         case kBGRA_8888_SkColorType:
             return colorPtr[fillIndex];
         case kRGB_565_SkColorType:
             return SkPixel32ToPixel16(colorPtr[fillIndex]);
         case kIndex_8_SkColorType:
             return fillIndex;
+        case kRGBA_F16_SkColorType: {
+            SkASSERT(colorXform);
+            uint64_t dstColor;
+            uint32_t srcColor = colorPtr[fillIndex];
+            colorXform->apply(&dstColor, &srcColor, 1, colorType, alphaType);
+            return dstColor;
+        }
         default:
             SkASSERT(false);
             return 0;
     }
 }
 
 /*
  *
  * Copy the codec color table back to the client when kIndex8 color type is requested
  */
@@ skipping 200 matching lines @@
             return kOpaque_SkAlphaType == src.alphaType() && !needs_color_xform(dst, src);
         case kGray_8_SkColorType:
             return kGray_8_SkColorType == src.colorType() &&
                    kOpaque_SkAlphaType == src.alphaType() && !needs_color_xform(dst, src);
         default:
             return false;
     }
 }
 
 #endif // SkCodecPriv_DEFINED