Delete dead SkImageDecoder::buildTileIndex and decodeSubset code

src/images/SkImageDecoder.cpp

Index: src/images/SkImageDecoder.cpp
diff --git a/src/images/SkImageDecoder.cpp b/src/images/SkImageDecoder.cpp
index 60cc44c5b4263f15fe58198cba6fc691608a9a19..d2ad553769b3100427b79325b54910d6786b79e3 100644
--- a/src/images/SkImageDecoder.cpp
+++ b/src/images/SkImageDecoder.cpp
@@ -142,76 +142,6 @@ SkImageDecoder::Result SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, Sk
     return result;
 }
 
-bool SkImageDecoder::decodeSubset(SkBitmap* bm, const SkIRect& rect, SkColorType pref) {
-    // we reset this to false before calling onDecodeSubset
-    fShouldCancelDecode = false;
-    // assign this, for use by getPrefColorType(), in case fUsePrefTable is false
-    fDefaultPref = pref;
-
-    return this->onDecodeSubset(bm, rect);
-}
-
-bool SkImageDecoder::buildTileIndex(SkStreamRewindable* stream, int *width, int *height) {
-    // we reset this to false before calling onBuildTileIndex
-    fShouldCancelDecode = false;
-
-    return this->onBuildTileIndex(stream, width, height);
-}
-
-bool SkImageDecoder::onBuildTileIndex(SkStreamRewindable* stream, int* /*width*/,
-                                      int* /*height*/) {
-    delete stream;
-    return false;
-}
-
-
-bool SkImageDecoder::cropBitmap(SkBitmap *dst, SkBitmap *src, int sampleSize,
-                                int dstX, int dstY, int width, int height,
-                                int srcX, int srcY) {
-    int w = width / sampleSize;
-    int h = height / sampleSize;
-    if (src->colorType() == kIndex_8_SkColorType) {
-        // kIndex8 does not allow drawing via an SkCanvas, as is done below.
-        // Instead, use extractSubset. Note that this shares the SkPixelRef and
-        // SkColorTable.
-        // FIXME: Since src is discarded in practice, this holds on to more
-        // pixels than is strictly necessary. Switch to a copy if memory
-        // savings are more important than speed here. This also means
-        // that the pixels in dst can not be reused (though there is no
-        // allocation, which was already done on src).
-        int x = (dstX - srcX) / sampleSize;
-        int y = (dstY - srcY) / sampleSize;
-        SkIRect subset = SkIRect::MakeXYWH(x, y, w, h);
-        return src->extractSubset(dst, subset);
-    }
-    // if the destination has no pixels then we must allocate them.
-    if (dst->isNull()) {
-        dst->setInfo(src->info().makeWH(w, h));
-
-        if (!this->allocPixelRef(dst, nullptr)) {
-            SkDEBUGF(("failed to allocate pixels needed to crop the bitmap"));
-            return false;
-        }
-    }
-    // check to see if the destination is large enough to decode the desired
-    // region. If this assert fails we will just draw as much of the source
-    // into the destination that we can.
-    if (dst->width() < w || dst->height() < h) {
-        SkDEBUGF(("SkImageDecoder::cropBitmap does not have a large enough bitmap.\n"));
-    }
-
-    // Set the Src_Mode for the paint to prevent transparency issue in the
-    // dest in the event that the dest was being re-used.
-    SkPaint paint;
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
-
-    SkCanvas canvas(*dst);
-    canvas.drawBitmap(*src, SkIntToScalar((srcX - dstX) / sampleSize),
-                            SkIntToScalar((srcY - dstY) / sampleSize),
-                            &paint);
-    return true;
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, SkColorType pref,  Mode mode,