Make haveDecodedRow return void

The method already always returns true, except in a single case after
asserting.

Change-Id: Icf241a8af04220d459c0782ffd9b74c34c753236
Reviewed-on: https://skia-review.googlesource.com/37161
Reviewed-by: Chris Blume <cblume@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>

src/codec/SkGifCodec.cpp

@@ -421,7 +421,7 @@ void SkGifCodec::applyXformRow(const SkImageInfo& dstInfo, void* dst, const uint
     }
 }
 
-bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
+void SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
                                 int rowNumber, int repeatCount, bool writeTransparentPixels)
 {
     const SkGIFFrameContext* frameContext = fReader->frameContext(frameIndex);
@@ -439,7 +439,7 @@ bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
     // FIXME: No need to make the checks on width/xBegin/xEnd for every row. We could instead do
     // this once in prepareToDecode.
     if (!width || (xBegin < 0) || (yBegin < 0) || (xEnd <= xBegin) || (yEnd <= yBegin))
-        return true;
+        return;
 
     // yBegin is the first row in the non-sampled image. dstRow will be the row in the output,
     // after potentially scaling it.
@@ -456,7 +456,7 @@ bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
                 dstRow = potentialRow / sampleY;
                 const int scaledHeight = get_scaled_dimension(this->dstInfo().height(), sampleY);
                 if (dstRow >= scaledHeight) {
-                    return true;
+                    return;
                 }
 
                 foundNecessaryRow = true;
@@ -474,7 +474,7 @@ bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
         }
 
         if (!foundNecessaryRow) {
-            return true;
+            return;
         }
     } else {
         // Make sure the repeatCount does not take us beyond the end of the dst
@@ -536,8 +536,7 @@ bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
                 break;
             default:
                 SkASSERT(false);
-                return false;
-                break;
+                return;
         }
         p.append(SkRasterPipeline::srcover);
         p.append(storeDst, &dst);
@@ -555,6 +554,4 @@ bool SkGifCodec::haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
             memcpy(dst, copiedLine, bytesToCopy);
         }
     }
-
-    return true;
 }

src/codec/SkGifCodec.h

@@ -32,7 +32,7 @@ public:
     static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);
 
     // Callback for SkGifImageReader when a row is available.
-    bool haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
+    void haveDecodedRow(int frameIndex, const unsigned char* rowBegin,
                         int rowNumber, int repeatCount, bool writeTransparentPixels);
 protected:
     /*

third_party/gif/SkGifImageReader.cpp

@@ -97,7 +97,7 @@ mailing address.
 #define GETINT16(p)   ((p)[1]<<8|(p)[0])
 
 // Send the data to the display front-end.
-bool SkGIFLZWContext::outputRow(const unsigned char* rowBegin)
+void SkGIFLZWContext::outputRow(const unsigned char* rowBegin)
 {
     int drowStart = irow;
     int drowEnd = irow;
@@ -144,13 +144,12 @@ bool SkGIFLZWContext::outputRow(const unsigned char* rowBegin)
 
     // Protect against too much image data.
     if (drowStart >= m_frameContext->height())
-        return true;
+        return;
 
     // CALLBACK: Let the client know we have decoded a row.
     const bool writeTransparentPixels = (SkCodec::kNone == m_frameContext->getRequiredFrame());
-    if (!m_client->haveDecodedRow(m_frameContext->frameId(), rowBegin,
-        drowStart, drowEnd - drowStart + 1, writeTransparentPixels))
-        return false;
+    m_client->haveDecodedRow(m_frameContext->frameId(), rowBegin,
+            drowStart, drowEnd - drowStart + 1, writeTransparentPixels);
 
     if (!m_frameContext->interlaced())
         irow++;
@@ -194,7 +193,6 @@ bool SkGIFLZWContext::outputRow(const unsigned char* rowBegin)
             }
         } while (irow > (unsigned) (m_frameContext->height() - 1));
     }
-    return true;
 }
 
 // Perform Lempel-Ziv-Welch decoding.
@@ -287,8 +285,7 @@ bool SkGIFLZWContext::doLZW(const unsigned char* block, size_t bytesInBlock)
             // Output as many rows as possible.
             unsigned char* rowBegin = rowBuffer.begin();
             for (; rowBegin + width <= rowIter; rowBegin += width) {
-                if (!outputRow(rowBegin))
-                    return false;
+                outputRow(rowBegin);
                 rowsRemaining--;
                 if (!rowsRemaining)
                     return true;

third_party/gif/SkGifImageReader.h

@@ -110,7 +110,7 @@ public:
     { }
 
     bool prepareToDecode();
-    bool outputRow(const unsigned char* rowBegin);
+    void outputRow(const unsigned char* rowBegin);
     bool doLZW(const unsigned char* block, size_t bytesInBlock);
     bool hasRemainingRows() { return SkToBool(rowsRemaining); }