Scanline decoding for gifs

src/codec/SkGifInterlaceIter.cpp

 /*
  * 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.
  */
 
 #include "SkGifInterlaceIter.h"
 
 static const uint8_t kStartingInterlaceYValues[] = { 0, 4, 2, 1 };
 static const uint8_t kDeltaInterlaceYValues[] = { 8, 8, 4, 2 };
 
 SkGifInterlaceIter::SkGifInterlaceIter(int height) : fHeight(height) {
     fStartYPtr = kStartingInterlaceYValues;
     fDeltaYPtr = kDeltaInterlaceYValues;
-
     fCurrY = *fStartYPtr++;
     fDeltaY = *fDeltaYPtr++;
 }
 
 void SkGifInterlaceIter::prepareY() {
     int32_t y = fCurrY + fDeltaY;
 
     // Iterate through fStartYPtr until a valid row is found.
     // This ensures that we do not move past the height of the small images.
     while (y >= fHeight) {
@@ skipping 12 matching lines @@
     fCurrY = y;
 }
 
 int32_t SkGifInterlaceIter::nextY() {
     SkASSERT(fStartYPtr);
     SkASSERT(fDeltaYPtr);
     int32_t y = fCurrY;
     prepareY();
     return y;
 }