Revert of Make SkPngCodec decode progressively.

tests/CodecTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkAndroidCodec.h"
 #include "SkBitmap.h"
@@ skipping 65 matching lines @@
     do {
         rect.fLeft = rand->nextRangeU(0, w);
         rect.fTop = rand->nextRangeU(0, h);
         rect.fRight = rand->nextRangeU(0, w);
         rect.fBottom = rand->nextRangeU(0, h);
         rect.sort();
     } while (rect.isEmpty());
     return rect;
 }
 
-static void test_incremental_decode(skiatest::Reporter* r, SkCodec* codec, const SkImageInfo& info,
-        const SkMD5::Digest& goodDigest) {
-    SkBitmap bm;
-    bm.allocPixels(info);
-    SkAutoLockPixels autoLockPixels(bm);
-
-    REPORTER_ASSERT(r, SkCodec::kSuccess == codec->startIncrementalDecode(info, bm.getPixels(),
-                                                                          bm.rowBytes()));
-
-    REPORTER_ASSERT(r, SkCodec::kSuccess == codec->incrementalDecode());
-
-    compare_to_good_digest(r, goodDigest, bm);
-}
-
-// Test in stripes, similar to DM's kStripe_Mode
-static void test_in_stripes(skiatest::Reporter* r, SkCodec* codec, const SkImageInfo& info,
-                            const SkMD5::Digest& goodDigest) {
-    SkBitmap bm;
-    bm.allocPixels(info);
-    bm.eraseColor(SK_ColorYELLOW);
-
-    const int height = info.height();
-    // Note that if numStripes does not evenly divide height there will be an extra
-    // stripe.
-    const int numStripes = 4;
-
-    if (numStripes > height) {
-        // Image is too small.
-        return;
-    }
-
-    const int stripeHeight = height / numStripes;
-
-    // Iterate through the image twice. Once to decode odd stripes, and once for even.
-    for (int oddEven = 1; oddEven >= 0; oddEven--) {
-        for (int y = oddEven * stripeHeight; y < height; y += 2 * stripeHeight) {
-            SkIRect subset = SkIRect::MakeLTRB(0, y, info.width(),
-                                               SkTMin(y + stripeHeight, height));
-            SkCodec::Options options;
-            options.fSubset = &subset;
-            if (SkCodec::kSuccess != codec->startIncrementalDecode(info, bm.getAddr(0, y),
-                        bm.rowBytes(), &options)) {
-                ERRORF(r, "failed to start incremental decode!\ttop: %i\tbottom%i\n",
-                       subset.top(), subset.bottom());
-                return;
-            }
-            if (SkCodec::kSuccess != codec->incrementalDecode()) {
-                ERRORF(r, "failed incremental decode starting from line %i\n", y);
-                return;
-            }
-        }
-    }
-
-    compare_to_good_digest(r, goodDigest, bm);
-}
-
 template<typename Codec>
 static void test_codec(skiatest::Reporter* r, Codec* codec, SkBitmap& bm, const SkImageInfo& info,
         const SkISize& size, SkCodec::Result expectedResult, SkMD5::Digest* digest,
         const SkMD5::Digest* goodDigest) {
 
     REPORTER_ASSERT(r, info.dimensions() == size);
     bm.allocPixels(info);
     SkAutoLockPixels autoLockPixels(bm);
 
     SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
@@ skipping 88 matching lines @@
     };
 
     for (uint32_t i = 0; i < SK_ARRAY_COUNT(exts); i++) {
         if (SkStrEndsWith(path, exts[i])) {
             return true;
         }
     }
     return false;
 }
 
-// FIXME: Break up this giant function
 static void check(skiatest::Reporter* r,
                   const char path[],
                   SkISize size,
                   bool supportsScanlineDecoding,
                   bool supportsSubsetDecoding,
-                  bool supportsIncomplete,
-                  bool supportsNewScanlineDecoding = false) {
+                  bool supportsIncomplete = true) {
 
     SkAutoTDelete<SkStream> stream(resource(path));
     if (!stream) {
         SkDebugf("Missing resource '%s'\n", path);
         return;
     }
 
     SkAutoTDelete<SkCodec> codec(nullptr);
     bool isIncomplete = supportsIncomplete;
     if (isIncomplete) {
         size_t size = stream->getLength();
         SkAutoTUnref<SkData> data((SkData::NewFromStream(stream, 2 * size / 3)));
         codec.reset(SkCodec::NewFromData(data));
     } else {
         codec.reset(SkCodec::NewFromStream(stream.release()));
     }
     if (!codec) {
         ERRORF(r, "Unable to decode '%s'", path);
         return;
     }
 
     // Test full image decodes with SkCodec
     SkMD5::Digest codecDigest;
     const SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
     SkBitmap bm;
     SkCodec::Result expectedResult = isIncomplete ? SkCodec::kIncompleteInput : SkCodec::kSuccess;
     test_codec(r, codec.get(), bm, info, size, expectedResult, &codecDigest, nullptr);
 
     // Scanline decoding follows.
+    // Need to call startScanlineDecode() first.
+    REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0)
+            == 0);
+    REPORTER_ASSERT(r, codec->skipScanlines(1)
+            == 0);
 
-    if (supportsNewScanlineDecoding && !isIncomplete) {
-        test_incremental_decode(r, codec, info, codecDigest);
-        test_in_stripes(r, codec, info, codecDigest);
-    }
-
-    // Need to call startScanlineDecode() first.
-    REPORTER_ASSERT(r, codec->getScanlines(bm.getAddr(0, 0), 1, 0) == 0);
-    REPORTER_ASSERT(r, !codec->skipScanlines(1));
     const SkCodec::Result startResult = codec->startScanlineDecode(info);
     if (supportsScanlineDecoding) {
         bm.eraseColor(SK_ColorYELLOW);
 
         REPORTER_ASSERT(r, startResult == SkCodec::kSuccess);
 
         for (int y = 0; y < info.height(); y++) {
             const int lines = codec->getScanlines(bm.getAddr(0, y), 1, 0);
             if (!isIncomplete) {
                 REPORTER_ASSERT(r, 1 == lines);
@@ skipping 74 matching lines @@
             // Webp is the only codec that supports subsets, and it will have modified the subset
             // to have even left/top.
             REPORTER_ASSERT(r, SkIsAlign2(subset.fLeft) && SkIsAlign2(subset.fTop));
         } else {
             // No subsets will work.
             REPORTER_ASSERT(r, result == SkCodec::kUnimplemented);
         }
     }
 
     // SkAndroidCodec tests
-    if (supportsScanlineDecoding || supportsSubsetDecoding || supportsNewScanlineDecoding) {
+    if (supportsScanlineDecoding || supportsSubsetDecoding) {
 
         SkAutoTDelete<SkStream> stream(resource(path));
         if (!stream) {
             SkDebugf("Missing resource '%s'\n", path);
             return;
         }
 
         SkAutoTDelete<SkAndroidCodec> androidCodec(nullptr);
         if (isIncomplete) {
             size_t size = stream->getLength();
@@ skipping 17 matching lines @@
         // Test SkCodecImageGenerator
         SkAutoTDelete<SkStream> stream(resource(path));
         SkAutoTUnref<SkData> fullData(SkData::NewFromStream(stream, stream->getLength()));
         SkAutoTDelete<SkImageGenerator> gen(SkCodecImageGenerator::NewFromEncodedCodec(fullData));
         SkBitmap bm;
         bm.allocPixels(info);
         SkAutoLockPixels autoLockPixels(bm);
         REPORTER_ASSERT(r, gen->getPixels(info, bm.getPixels(), bm.rowBytes()));
         compare_to_good_digest(r, codecDigest, bm);
 
-#if PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR < 5
-        // FIXME: With older versions of libpng, SkPngCodec requires being able to call
-        // SkStream::move(), which is not supported by SkFrontBufferedStream. (Android
-        // has a more recent version of libpng which uses png_process_data_pause to
-        // avoid calling move().)
-        if (!SkStrEndsWith(path, ".png"))
-#endif
-        {
-            // Test using SkFrontBufferedStream, as Android does
-            SkStream* bufferedStream = SkFrontBufferedStream::Create(new SkMemoryStream(fullData),
-                    SkCodec::MinBufferedBytesNeeded());
-            REPORTER_ASSERT(r, bufferedStream);
-            codec.reset(SkCodec::NewFromStream(bufferedStream));
-            REPORTER_ASSERT(r, codec);
-            if (codec) {
-                test_info(r, codec.get(), info, SkCodec::kSuccess, &codecDigest);
-            }
+        // Test using SkFrontBufferedStream, as Android does
+        SkStream* bufferedStream = SkFrontBufferedStream::Create(new SkMemoryStream(fullData),
+                SkCodec::MinBufferedBytesNeeded());
+        REPORTER_ASSERT(r, bufferedStream);
+        codec.reset(SkCodec::NewFromStream(bufferedStream));
+        REPORTER_ASSERT(r, codec);
+        if (codec) {
+            test_info(r, codec.get(), info, SkCodec::kSuccess, &codecDigest);
         }
     }
 
     // If we've just tested incomplete decodes, let's run the same test again on full decodes.
     if (isIncomplete) {
         check(r, path, size, supportsScanlineDecoding, supportsSubsetDecoding, false);
     }
 }
 
 DEF_TEST(Codec, r) {
     // WBMP
-    check(r, "mandrill.wbmp", SkISize::Make(512, 512), true, false, true);
+    check(r, "mandrill.wbmp", SkISize::Make(512, 512), true, false);
 
     // WEBP
-    check(r, "baby_tux.webp", SkISize::Make(386, 395), false, true, true);
-    check(r, "color_wheel.webp", SkISize::Make(128, 128), false, true, true);
-    check(r, "yellow_rose.webp", SkISize::Make(400, 301), false, true, true);
+    check(r, "baby_tux.webp", SkISize::Make(386, 395), false, true);
+    check(r, "color_wheel.webp", SkISize::Make(128, 128), false, true);
+    check(r, "yellow_rose.webp", SkISize::Make(400, 301), false, true);
 
     // BMP
-    check(r, "randPixels.bmp", SkISize::Make(8, 8), true, false, true);
-    check(r, "rle.bmp", SkISize::Make(320, 240), true, false, true);
+    check(r, "randPixels.bmp", SkISize::Make(8, 8), true, false);
+    check(r, "rle.bmp", SkISize::Make(320, 240), true, false);
 
     // ICO
     // FIXME: We are not ready to test incomplete ICOs
     // These two tests examine interestingly different behavior:
     // Decodes an embedded BMP image
     check(r, "color_wheel.ico", SkISize::Make(128, 128), true, false, false);
     // Decodes an embedded PNG image
-    check(r, "google_chrome.ico", SkISize::Make(256, 256), false, false, false, true);
+    check(r, "google_chrome.ico", SkISize::Make(256, 256), true, false, false);
 
     // GIF
     // FIXME: We are not ready to test incomplete GIFs
     check(r, "box.gif", SkISize::Make(200, 55), true, false, false);
     check(r, "color_wheel.gif", SkISize::Make(128, 128), true, false, false);
     // randPixels.gif is too small to test incomplete
     check(r, "randPixels.gif", SkISize::Make(8, 8), true, false, false);
 
     // JPG
-    check(r, "CMYK.jpg", SkISize::Make(642, 516), true, false, true);
-    check(r, "color_wheel.jpg", SkISize::Make(128, 128), true, false, true);
+    check(r, "CMYK.jpg", SkISize::Make(642, 516), true, false);
+    check(r, "color_wheel.jpg", SkISize::Make(128, 128), true, false);
     // grayscale.jpg is too small to test incomplete
     check(r, "grayscale.jpg", SkISize::Make(128, 128), true, false, false);
-    check(r, "mandrill_512_q075.jpg", SkISize::Make(512, 512), true, false, true);
+    check(r, "mandrill_512_q075.jpg", SkISize::Make(512, 512), true, false);
     // randPixels.jpg is too small to test incomplete
     check(r, "randPixels.jpg", SkISize::Make(8, 8), true, false, false);
 
     // PNG
-    check(r, "arrow.png", SkISize::Make(187, 312), false, false, true, true);
-    check(r, "baby_tux.png", SkISize::Make(240, 246), false, false, true, true);
-    check(r, "color_wheel.png", SkISize::Make(128, 128), false, false, true, true);
-    // half-transparent-white-pixel.png is too small to test incomplete
-    check(r, "half-transparent-white-pixel.png", SkISize::Make(1, 1), false, false, false, true);
-    check(r, "mandrill_128.png", SkISize::Make(128, 128), false, false, true, true);
-    check(r, "mandrill_16.png", SkISize::Make(16, 16), false, false, true, true);
-    check(r, "mandrill_256.png", SkISize::Make(256, 256), false, false, true, true);
-    check(r, "mandrill_32.png", SkISize::Make(32, 32), false, false, true, true);
-    check(r, "mandrill_512.png", SkISize::Make(512, 512), false, false, true, true);
-    check(r, "mandrill_64.png", SkISize::Make(64, 64), false, false, true, true);
-    check(r, "plane.png", SkISize::Make(250, 126), false, false, true, true);
-    check(r, "plane_interlaced.png", SkISize::Make(250, 126), false, false, true, true);
-    check(r, "randPixels.png", SkISize::Make(8, 8), false, false, true, true);
-    check(r, "yellow_rose.png", SkISize::Make(400, 301), false, false, true, true);
+    check(r, "arrow.png", SkISize::Make(187, 312), true, false, false);
+    check(r, "baby_tux.png", SkISize::Make(240, 246), true, false, false);
+    check(r, "color_wheel.png", SkISize::Make(128, 128), true, false, false);
+    check(r, "half-transparent-white-pixel.png", SkISize::Make(1, 1), true, false, false);
+    check(r, "mandrill_128.png", SkISize::Make(128, 128), true, false, false);
+    check(r, "mandrill_16.png", SkISize::Make(16, 16), true, false, false);
+    check(r, "mandrill_256.png", SkISize::Make(256, 256), true, false, false);
+    check(r, "mandrill_32.png", SkISize::Make(32, 32), true, false, false);
+    check(r, "mandrill_512.png", SkISize::Make(512, 512), true, false, false);
+    check(r, "mandrill_64.png", SkISize::Make(64, 64), true, false, false);
+    check(r, "plane.png", SkISize::Make(250, 126), true, false, false);
+    // FIXME: We are not ready to test incomplete interlaced pngs
+    check(r, "plane_interlaced.png", SkISize::Make(250, 126), true, false, false);
+    check(r, "randPixels.png", SkISize::Make(8, 8), true, false, false);
+    check(r, "yellow_rose.png", SkISize::Make(400, 301), true, false, false);
 
     // RAW
 // Disable RAW tests for Win32.
 #if defined(SK_CODEC_DECODES_RAW) && (!defined(_WIN32))
     check(r, "sample_1mp.dng", SkISize::Make(600, 338), false, false, false);
     check(r, "sample_1mp_rotated.dng", SkISize::Make(600, 338), false, false, false);
     check(r, "dng_with_preview.dng", SkISize::Make(600, 338), true, false, false);
 #endif
 }
 
+// Test interlaced PNG in stripes, similar to DM's kStripe_Mode
+DEF_TEST(Codec_stripes, r) {
+    const char * path = "plane_interlaced.png";
+    SkAutoTDelete<SkStream> stream(resource(path));
+    if (!stream) {
+        SkDebugf("Missing resource '%s'\n", path);
+    }
+
+    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.release()));
+    REPORTER_ASSERT(r, codec);
+
+    if (!codec) {
+        return;
+    }
+
+    switch (codec->getScanlineOrder()) {
+        case SkCodec::kBottomUp_SkScanlineOrder:
+        case SkCodec::kOutOfOrder_SkScanlineOrder:
+            ERRORF(r, "This scanline order will not match the original.");
+            return;
+        default:
+            break;
+    }
+
+    // Baseline for what the image should look like, using N32.
+    const SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
+
+    SkBitmap bm;
+    bm.allocPixels(info);
+    SkAutoLockPixels autoLockPixels(bm);
+    SkCodec::Result result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
+    REPORTER_ASSERT(r, result == SkCodec::kSuccess);
+
+    SkMD5::Digest digest;
+    md5(bm, &digest);
+
+    // Now decode in stripes
+    const int height = info.height();
+    const int numStripes = 4;
+    int stripeHeight;
+    int remainingLines;
+    SkTDivMod(height, numStripes, &stripeHeight, &remainingLines);
+
+    bm.eraseColor(SK_ColorYELLOW);
+
+    result = codec->startScanlineDecode(info);
+    REPORTER_ASSERT(r, result == SkCodec::kSuccess);
+
+    // Odd stripes
+    for (int i = 1; i < numStripes; i += 2) {
+        // Skip the even stripes
+        bool skipResult = codec->skipScanlines(stripeHeight);
+        REPORTER_ASSERT(r, skipResult);
+
+        int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
+                                     bm.rowBytes());
+        REPORTER_ASSERT(r, linesDecoded == stripeHeight);
+    }
+
+    // Even stripes
+    result = codec->startScanlineDecode(info);
+    REPORTER_ASSERT(r, result == SkCodec::kSuccess);
+
+    for (int i = 0; i < numStripes; i += 2) {
+        int linesDecoded = codec->getScanlines(bm.getAddr(0, i * stripeHeight), stripeHeight,
+                                     bm.rowBytes());
+        REPORTER_ASSERT(r, linesDecoded == stripeHeight);
+
+        // Skip the odd stripes
+        if (i + 1 < numStripes) {
+            bool skipResult = codec->skipScanlines(stripeHeight);
+            REPORTER_ASSERT(r, skipResult);
+        }
+    }
+
+    // Remainder at the end
+    if (remainingLines > 0) {
+        result = codec->startScanlineDecode(info);
+        REPORTER_ASSERT(r, result == SkCodec::kSuccess);
+
+        bool skipResult = codec->skipScanlines(height - remainingLines);
+        REPORTER_ASSERT(r, skipResult);
+
+        int linesDecoded = codec->getScanlines(bm.getAddr(0, height - remainingLines),
+                                     remainingLines, bm.rowBytes());
+        REPORTER_ASSERT(r, linesDecoded == remainingLines);
+    }
+
+    compare_to_good_digest(r, digest, bm);
+}
+
 static void test_invalid_stream(skiatest::Reporter* r, const void* stream, size_t len) {
     // Neither of these calls should return a codec. Bots should catch us if we leaked anything.
     SkCodec* codec = SkCodec::NewFromStream(new SkMemoryStream(stream, len, false));
     REPORTER_ASSERT(r, !codec);
 
     SkAndroidCodec* androidCodec =
             SkAndroidCodec::NewFromStream(new SkMemoryStream(stream, len, false));
     REPORTER_ASSERT(r, !androidCodec);
 }
 
@@ skipping 122 matching lines @@
     test_invalid(r, "invalid_images/mask-bmp-ico.ico");
 }
 
 static void test_invalid_parameters(skiatest::Reporter* r, const char path[]) {
     SkAutoTDelete<SkStream> stream(resource(path));
     if (!stream) {
         SkDebugf("Missing resource '%s'\n", path);
         return;
     }
     SkAutoTDelete<SkCodec> decoder(SkCodec::NewFromStream(stream.release()));
-    if (!decoder) {
-        SkDebugf("Missing codec for %s\n", path);
-        return;
-    }
-
-    const SkImageInfo info = decoder->getInfo().makeColorType(kIndex_8_SkColorType);
 
     // This should return kSuccess because kIndex8 is supported.
     SkPMColor colorStorage[256];
     int colorCount;
-    SkCodec::Result result = decoder->startScanlineDecode(info, nullptr, colorStorage,
-                                                          &colorCount);
-    if (SkCodec::kSuccess == result) {
-        // This should return kInvalidParameters because, in kIndex_8 mode, we must pass in a valid
-        // colorPtr and a valid colorCountPtr.
-        result = decoder->startScanlineDecode(info, nullptr, nullptr, nullptr);
-        REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
-        result = decoder->startScanlineDecode(info);
-        REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
-    } else if (SkCodec::kUnimplemented == result) {
-        // New method should be supported:
-        SkBitmap bm;
-        sk_sp<SkColorTable> colorTable(new SkColorTable(colorStorage, 256));
-        bm.allocPixels(info, nullptr, colorTable.get());
-        result = decoder->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes(), nullptr,
-                                                 colorStorage, &colorCount);
-        REPORTER_ASSERT(r, SkCodec::kSuccess == result);
-        result = decoder->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes());
-        REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
-    } else {
-        // The test is uninteresting if kIndex8 is not supported
-        ERRORF(r, "Should not call test_invalid_parameters for non-Index8 file: %s\n", path);
+    SkCodec::Result result = decoder->startScanlineDecode(
+        decoder->getInfo().makeColorType(kIndex_8_SkColorType), nullptr, colorStorage, &colorCount);
+    REPORTER_ASSERT(r, SkCodec::kSuccess == result);
+    // The rest of the test is uninteresting if kIndex8 is not supported
+    if (SkCodec::kSuccess != result) {
         return;
     }
 
+    // This should return kInvalidParameters because, in kIndex_8 mode, we must pass in a valid
+    // colorPtr and a valid colorCountPtr.
+    result = decoder->startScanlineDecode(
+        decoder->getInfo().makeColorType(kIndex_8_SkColorType), nullptr, nullptr, nullptr);
+    REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
+    result = decoder->startScanlineDecode(
+        decoder->getInfo().makeColorType(kIndex_8_SkColorType));
+    REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
 }
 
 DEF_TEST(Codec_Params, r) {
     test_invalid_parameters(r, "index8.png");
     test_invalid_parameters(r, "mandrill.wbmp");
 }
 
 static void codex_test_write_fn(png_structp png_ptr, png_bytep data, png_size_t len) {
     SkWStream* sk_stream = (SkWStream*)png_get_io_ptr(png_ptr);
     if (!sk_stream->write(data, len)) {
@@ skipping 295 matching lines @@
     // Now test an image which is too big. Any image with a larger header (i.e.
     // has bigger width/height) is also too big.
     const unsigned char tooBigWbmp[] = { 0x00, 0x00,           // Header
                                          0x84, 0x80, 0x00,     // W: 65536
                                          0x84, 0x80, 0x00 };   // H: 65536
     stream.reset(new SkMemoryStream(tooBigWbmp, sizeof(tooBigWbmp), false));
     codec.reset(SkCodec::NewFromStream(stream.release()));
 
     REPORTER_ASSERT(r, !codec);
 }
-
-// Only rewinds up to a limit.
-class LimitedRewindingStream : public SkStream {
-public:
-    static SkStream* Make(const char path[], size_t limit) {
-        SkStream* stream = resource(path);
-        if (!stream) {
-            return nullptr;
-        }
-        return new LimitedRewindingStream(stream, limit);
-    }
-
-    size_t read(void* buffer, size_t size) override {
-        const size_t bytes = fStream->read(buffer, size);
-        fPosition += bytes;
-        return bytes;
-    }
-
-    bool isAtEnd() const override {
-        return fStream->isAtEnd();
-    }
-
-    bool rewind() override {
-        if (fPosition <= fLimit && fStream->rewind()) {
-            fPosition = 0;
-            return true;
-        }
-
-        return false;
-    }
-
-private:
-    SkAutoTDelete<SkStream> fStream;
-    const size_t            fLimit;
-    size_t                  fPosition;
-
-    LimitedRewindingStream(SkStream* stream, size_t limit)
-        : fStream(stream)
-        , fLimit(limit)
-        , fPosition(0)
-    {
-        SkASSERT(fStream);
-    }
-};
-
-DEF_TEST(Codec_fallBack, r) {
-    // SkAndroidCodec needs to be able to fall back to scanline decoding
-    // if incremental decoding does not work. Make sure this does not
-    // require a rewind.
-
-    // Formats that currently do not support incremental decoding
-    auto files = {
-            "box.gif",
-            "CMYK.jpg",
-            "color_wheel.ico",
-            "mandrill.wbmp",
-            "randPixels.bmp",
-            };
-    for (auto file : files) {
-        SkStream* stream = LimitedRewindingStream::Make(file, 14);
-        if (!stream) {
-            SkDebugf("Missing resources (%s). Set --resourcePath.\n", file);
-            return;
-        }
-
-        SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream));
-        if (!codec) {
-            ERRORF(r, "Failed to create codec for %s,", file);
-            continue;
-        }
-
-        SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
-        SkBitmap bm;
-        bm.allocPixels(info);
-
-        if (SkCodec::kUnimplemented != codec->startIncrementalDecode(info, bm.getPixels(),
-                bm.rowBytes())) {
-            ERRORF(r, "Is scanline decoding now implemented for %s?", file);
-            continue;
-        }
-
-        // Scanline decoding should not require a rewind.
-        SkCodec::Result result = codec->startScanlineDecode(info);
-        if (SkCodec::kSuccess != result) {
-            ERRORF(r, "Scanline decoding failed for %s with %i", file, result);
-        }
-    }
-}