tests/CodecPartialTest.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkBitmap.h"
 #include "SkCodec.h"
 #include "SkData.h"
 #include "SkImageInfo.h"
 #include "SkRWBuffer.h"
 #include "SkString.h"

 #include "FakeStreams.h"
 #include "Resources.h"
 #include "Test.h"

 static sk_sp<SkData> make_from_resource(const char* name) {
     SkString fullPath = GetResourcePath(name);
     return SkData::MakeFromFileName(fullPath.c_str());
 }

 static SkImageInfo standardize_info(SkCodec* codec) {
     SkImageInfo defaultInfo = codec->getInfo();
     // Note: This drops the SkColorSpace, allowing the equality check between two
     // different codecs created from the same file to have the same SkImageInfo.
     return SkImageInfo::MakeN32Premul(defaultInfo.width(), defaultInfo.height());
 }

 static bool create_truth(sk_sp<SkData> data, SkBitmap* dst) {
     std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(std::move(data)));
     if (!codec) {
         return false;
     }

     const SkImageInfo info = standardize_info(codec.get());
     dst->allocPixels(info);
     return SkCodec::kSuccess == codec->getPixels(info, dst->getPixels(), dst->rowBytes());
 }

 static void compare_bitmaps(skiatest::Reporter* r, const SkBitmap& bm1, const SkBitmap& bm2) {
     const SkImageInfo& info = bm1.info();
     if (info != bm2.info()) {
         ERRORF(r, "Bitmaps have different image infos!");
         return;
     }
     const size_t rowBytes = info.minRowBytes();
     for (int i = 0; i < info.height(); i++) {
         REPORTER_ASSERT(r, !memcmp(bm1.getAddr(0, 0), bm2.getAddr(0, 0), rowBytes));
     }
 }

 static void test_partial(skiatest::Reporter* r, const char* name, size_t minBytes = 0) {
     sk_sp<SkData> file = make_from_resource(name);
     if (!file) {
         SkDebugf("missing resource %s\n", name);
         return;
     }

     SkBitmap truth;
     if (!create_truth(file, &truth)) {
         ERRORF(r, "Failed to decode %s\n", name);
         return;
     }

     // Now decode part of the file
     HaltingStream* stream = new HaltingStream(file, SkTMax(file->size() / 2, minBytes));

     // Note that we cheat and hold on to a pointer to stream, though it is owned by
     // partialCodec.
     std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(stream));
     if (!partialCodec) {
         // Technically, this could be a small file where half the file is not
         // enough.
         ERRORF(r, "Failed to create codec for %s", name);
         return;
     }

     const SkImageInfo info = standardize_info(partialCodec.get());
     SkASSERT(info == truth.info());
     SkBitmap incremental;
     incremental.allocPixels(info);

     while (true) {
         const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info,
                 incremental.getPixels(), incremental.rowBytes());
         if (startResult == SkCodec::kSuccess) {
             break;
         }

         if (stream->isAllDataReceived()) {
             ERRORF(r, "Failed to start incremental decode\n");
             return;
         }

         // Append some data. The size is arbitrary, but deliberately different from
         // the buffer size used by SkPngCodec.
         stream->addNewData(1000);
     }

     while (true) {
         const SkCodec::Result result = partialCodec->incrementalDecode();

         if (result == SkCodec::kSuccess) {
             break;
         }

         REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

         if (stream->isAllDataReceived()) {
             ERRORF(r, "Failed to completely decode %s", name);
             return;
         }

         // Append some data. The size is arbitrary, but deliberately different from
         // the buffer size used by SkPngCodec.
         stream->addNewData(1000);
     }

     // compare to original
     compare_bitmaps(r, truth, incremental);
 }

 DEF_TEST(Codec_partial, r) {
     test_partial(r, "plane.png");
     test_partial(r, "plane_interlaced.png");
     test_partial(r, "yellow_rose.png");
     test_partial(r, "index8.png");
     test_partial(r, "color_wheel.png");
     test_partial(r, "mandrill_256.png");
     test_partial(r, "mandrill_32.png");
     test_partial(r, "arrow.png");
     test_partial(r, "randPixels.png");
     test_partial(r, "baby_tux.png");

     test_partial(r, "box.gif");
     test_partial(r, "randPixels.gif", 215);
     test_partial(r, "color_wheel.gif");
 }

 DEF_TEST(Codec_partialAnim, r) {
     auto path = "test640x479.gif";
     sk_sp<SkData> file = make_from_resource(path);
     if (!file) {
         return;
     }

     // This stream will be owned by fullCodec, but we hang on to the pointer
     // to determine frame offsets.
     SkStream* stream = new SkMemoryStream(file);
     std::unique_ptr<SkCodec> fullCodec(SkCodec::NewFromStream(stream));
     const auto info = standardize_info(fullCodec.get());

     // frameByteCounts stores the number of bytes to decode a particular frame.
     // - [0] is the number of bytes for the header
     // - frames[i] requires frameByteCounts[i+1] bytes to decode
     std::vector<size_t> frameByteCounts;
     std::vector<SkBitmap> frames;
     size_t lastOffset = 0;
     for (size_t i = 0; true; i++) {
         frameByteCounts.push_back(stream->getPosition() - lastOffset);
         lastOffset = stream->getPosition();

         SkBitmap frame;
         frame.allocPixels(info);

         SkCodec::Options opts;
         opts.fFrameIndex = i;
         const SkCodec::Result result = fullCodec->getPixels(info, frame.getPixels(),
                 frame.rowBytes(), &opts, nullptr, nullptr);

         if (result == SkCodec::kIncompleteInput || result == SkCodec::kInvalidInput) {
             frameByteCounts.push_back(stream->getPosition() - lastOffset);

             // We need to distinguish between a partial frame and no more frames.
             // getFrameInfo lets us do this, since it tells the number of frames
             // not considering whether they are complete.
             // FIXME: Should we use a different Result?
             if (fullCodec->getFrameInfo().size() > i) {
                 // This is a partial frame.
                 frames.push_back(frame);
             }
             break;
         }

         if (result != SkCodec::kSuccess) {
             ERRORF(r, "Failed to decode frame %i from %s", i, path);
             return;
         }

         frames.push_back(frame);
     }

     // Now decode frames partially, then completely, and compare to the original.
     HaltingStream* haltingStream = new HaltingStream(file, frameByteCounts[0]);
     std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(haltingStream));
     if (!partialCodec) {
         ERRORF(r, "Failed to create a partial codec from %s with %i bytes out of %i",
                path, frameByteCounts[0], file->size());
         return;
     }

     SkASSERT(frameByteCounts.size() > frames.size());
     for (size_t i = 0; i < frames.size(); i++) {
         const size_t fullFrameBytes = frameByteCounts[i + 1];
         const size_t firstHalf = fullFrameBytes / 2;
         const size_t secondHalf = fullFrameBytes - firstHalf;

         haltingStream->addNewData(firstHalf);
         auto frameInfo = partialCodec->getFrameInfo();
         REPORTER_ASSERT(r, frameInfo.size() == i + 1);
         REPORTER_ASSERT(r, !frameInfo[i].fFullyReceived);

         SkBitmap frame;
         frame.allocPixels(info);

         SkCodec::Options opts;
         opts.fFrameIndex = i;
         SkCodec::Result result = partialCodec->startIncrementalDecode(info,
                 frame.getPixels(), frame.rowBytes(), &opts);
         if (result != SkCodec::kSuccess) {
             ERRORF(r, "Failed to start incremental decode for %s on frame %i",
                    path, i);
             return;
         }

         result = partialCodec->incrementalDecode();
         REPORTER_ASSERT(r, SkCodec::kIncompleteInput == result);

         haltingStream->addNewData(secondHalf);
         result = partialCodec->incrementalDecode();
         REPORTER_ASSERT(r, SkCodec::kSuccess == result);

         frameInfo = partialCodec->getFrameInfo();
         REPORTER_ASSERT(r, frameInfo.size() == i + 1);
         REPORTER_ASSERT(r, frameInfo[i].fFullyReceived);

         // allocPixels locked the pixels for frame, but frames[i] was copied
         // from another bitmap, and did not retain the locked status.
         SkAutoLockPixels alp(frames[i]);
         compare_bitmaps(r, frames[i], frame);
     }
 }

 // Test that calling getPixels when an incremental decode has been
 // started (but not finished) makes the next call to incrementalDecode
 // require a call to startIncrementalDecode.
 static void test_interleaved(skiatest::Reporter* r, const char* name) {
     sk_sp<SkData> file = make_from_resource(name);
     if (!file) {
         return;
     }
     const size_t halfSize = file->size() / 2;
     std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(
             new HaltingStream(std::move(file), halfSize)));
     if (!partialCodec) {
         ERRORF(r, "Failed to create codec for %s", name);
         return;
     }

     const SkImageInfo info = standardize_info(partialCodec.get());
     SkBitmap incremental;
     incremental.allocPixels(info);

     const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info,
             incremental.getPixels(), incremental.rowBytes());
     if (startResult != SkCodec::kSuccess) {
         ERRORF(r, "Failed to start incremental decode\n");
         return;
     }

     SkCodec::Result result = partialCodec->incrementalDecode();
     REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

     SkBitmap full;
     full.allocPixels(info);
     result = partialCodec->getPixels(info, full.getPixels(), full.rowBytes());
     REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

     // Now incremental decode will fail
     result = partialCodec->incrementalDecode();
     REPORTER_ASSERT(r, result == SkCodec::kInvalidParameters);
 }

 DEF_TEST(Codec_rewind, r) {
     test_interleaved(r, "plane.png");
     test_interleaved(r, "plane_interlaced.png");
     test_interleaved(r, "box.gif");
 }

 // Modified version of the giflib logo, from
 // http://giflib.sourceforge.net/whatsinagif/bits_and_bytes.html
 // The global color map has been replaced with a local color map.
 static unsigned char gNoGlobalColorMap[] = {
   // Header
   0x47, 0x49, 0x46, 0x38, 0x39, 0x61,

   // Logical screen descriptor
   0x0A, 0x00, 0x0A, 0x00, 0x11, 0x00, 0x00,

   // Image descriptor
   0x2C, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x0A, 0x00, 0x81,

   // Local color table
   0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00,

   // Image data
   0x02, 0x16, 0x8C, 0x2D, 0x99, 0x87, 0x2A, 0x1C, 0xDC, 0x33, 0xA0, 0x02, 0x75,
   0xEC, 0x95, 0xFA, 0xA8, 0xDE, 0x60, 0x8C, 0x04, 0x91, 0x4C, 0x01, 0x00,

   // Trailer
   0x3B,
 };

 // Test that a gif file truncated before its local color map behaves as expected.
 DEF_TEST(Codec_GifPreMap, r) {
     sk_sp<SkData> data = SkData::MakeWithoutCopy(gNoGlobalColorMap, sizeof(gNoGlobalColorMap));
     std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data));
     if (!codec) {
         ERRORF(r, "failed to create codec");
         return;
     }

     SkBitmap truth;
     auto info = standardize_info(codec.get());
     truth.allocPixels(info);

     auto result = codec->getPixels(info, truth.getPixels(), truth.rowBytes());
     REPORTER_ASSERT(r, result == SkCodec::kSuccess);

     // Truncate to 23 bytes, just before the color map. This should fail to decode.
     codec.reset(SkCodec::NewFromData(SkData::MakeWithoutCopy(gNoGlobalColorMap, 23)));
     REPORTER_ASSERT(r, codec);
     if (codec) {
         SkBitmap bm;
         bm.allocPixels(info);
         result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
         REPORTER_ASSERT(r, result == SkCodec::kInvalidInput);
     }

     // Again, truncate to 23 bytes, this time for an incremental decode. We
     // cannot start an incremental decode until we have more data. If we did,
     // we would be using the wrong color table.
     HaltingStream* stream = new HaltingStream(data, 23);
     codec.reset(SkCodec::NewFromStream(stream));
     REPORTER_ASSERT(r, codec);
     if (codec) {
         SkBitmap bm;
         bm.allocPixels(info);
         result = codec->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes());
         REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

         stream->addNewData(data->size());
         result = codec->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes());
         REPORTER_ASSERT(r, result == SkCodec::kSuccess);

         result = codec->incrementalDecode();
         REPORTER_ASSERT(r, result == SkCodec::kSuccess);
         compare_bitmaps(r, truth, bm);
     }
 }
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkBitmap.h"
	#include "SkCodec.h"
	#include "SkData.h"
	#include "SkImageInfo.h"
	#include "SkRWBuffer.h"
	#include "SkString.h"

	#include "FakeStreams.h"
	#include "Resources.h"
	#include "Test.h"

	static sk_sp<SkData> make_from_resource(const char* name) {
	SkString fullPath = GetResourcePath(name);
	return SkData::MakeFromFileName(fullPath.c_str());
	}

	static SkImageInfo standardize_info(SkCodec* codec) {
	SkImageInfo defaultInfo = codec->getInfo();
	// Note: This drops the SkColorSpace, allowing the equality check between two
	// different codecs created from the same file to have the same SkImageInfo.
	return SkImageInfo::MakeN32Premul(defaultInfo.width(), defaultInfo.height());
	}

	static bool create_truth(sk_sp<SkData> data, SkBitmap* dst) {
	std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(std::move(data)));
	if (!codec) {
	return false;
	}

	const SkImageInfo info = standardize_info(codec.get());
	dst->allocPixels(info);
	return SkCodec::kSuccess == codec->getPixels(info, dst->getPixels(), dst->rowBytes());
	}

	static void compare_bitmaps(skiatest::Reporter* r, const SkBitmap& bm1, const SkBitmap& bm2) {
	const SkImageInfo& info = bm1.info();
	if (info != bm2.info()) {
	ERRORF(r, "Bitmaps have different image infos!");
	return;
	}
	const size_t rowBytes = info.minRowBytes();
	for (int i = 0; i < info.height(); i++) {
	REPORTER_ASSERT(r, !memcmp(bm1.getAddr(0, 0), bm2.getAddr(0, 0), rowBytes));
	}
	}

	static void test_partial(skiatest::Reporter* r, const char* name, size_t minBytes = 0) {
	sk_sp<SkData> file = make_from_resource(name);
	if (!file) {
	SkDebugf("missing resource %s\n", name);
	return;
	}

	SkBitmap truth;
	if (!create_truth(file, &truth)) {
	ERRORF(r, "Failed to decode %s\n", name);
	return;
	}

	// Now decode part of the file
	HaltingStream* stream = new HaltingStream(file, SkTMax(file->size() / 2, minBytes));

	// Note that we cheat and hold on to a pointer to stream, though it is owned by
	// partialCodec.
	std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(stream));
	if (!partialCodec) {
	// Technically, this could be a small file where half the file is not
	// enough.
	ERRORF(r, "Failed to create codec for %s", name);
	return;
	}

	const SkImageInfo info = standardize_info(partialCodec.get());
	SkASSERT(info == truth.info());
	SkBitmap incremental;
	incremental.allocPixels(info);

	while (true) {
	const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info,
	incremental.getPixels(), incremental.rowBytes());
	if (startResult == SkCodec::kSuccess) {
	break;
	}

	if (stream->isAllDataReceived()) {
	ERRORF(r, "Failed to start incremental decode\n");
	return;
	}

	// Append some data. The size is arbitrary, but deliberately different from
	// the buffer size used by SkPngCodec.
	stream->addNewData(1000);
	}

	while (true) {
	const SkCodec::Result result = partialCodec->incrementalDecode();

	if (result == SkCodec::kSuccess) {
	break;
	}

	REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

	if (stream->isAllDataReceived()) {
	ERRORF(r, "Failed to completely decode %s", name);
	return;
	}

	// Append some data. The size is arbitrary, but deliberately different from
	// the buffer size used by SkPngCodec.
	stream->addNewData(1000);
	}

	// compare to original
	compare_bitmaps(r, truth, incremental);
	}

	DEF_TEST(Codec_partial, r) {
	test_partial(r, "plane.png");
	test_partial(r, "plane_interlaced.png");
	test_partial(r, "yellow_rose.png");
	test_partial(r, "index8.png");
	test_partial(r, "color_wheel.png");
	test_partial(r, "mandrill_256.png");
	test_partial(r, "mandrill_32.png");
	test_partial(r, "arrow.png");
	test_partial(r, "randPixels.png");
	test_partial(r, "baby_tux.png");

	test_partial(r, "box.gif");
	test_partial(r, "randPixels.gif", 215);
	test_partial(r, "color_wheel.gif");
	}

	DEF_TEST(Codec_partialAnim, r) {
	auto path = "test640x479.gif";
	sk_sp<SkData> file = make_from_resource(path);
	if (!file) {
	return;
	}

	// This stream will be owned by fullCodec, but we hang on to the pointer
	// to determine frame offsets.
	SkStream* stream = new SkMemoryStream(file);
	std::unique_ptr<SkCodec> fullCodec(SkCodec::NewFromStream(stream));
	const auto info = standardize_info(fullCodec.get());

	// frameByteCounts stores the number of bytes to decode a particular frame.
	// - [0] is the number of bytes for the header
	// - frames[i] requires frameByteCounts[i+1] bytes to decode
	std::vector<size_t> frameByteCounts;
	std::vector<SkBitmap> frames;
	size_t lastOffset = 0;
	for (size_t i = 0; true; i++) {
	frameByteCounts.push_back(stream->getPosition() - lastOffset);
	lastOffset = stream->getPosition();

	SkBitmap frame;
	frame.allocPixels(info);

	SkCodec::Options opts;
	opts.fFrameIndex = i;
	const SkCodec::Result result = fullCodec->getPixels(info, frame.getPixels(),
	frame.rowBytes(), &opts, nullptr, nullptr);

	if (result == SkCodec::kIncompleteInput \|\| result == SkCodec::kInvalidInput) {
	frameByteCounts.push_back(stream->getPosition() - lastOffset);

	// We need to distinguish between a partial frame and no more frames.
	// getFrameInfo lets us do this, since it tells the number of frames
	// not considering whether they are complete.
	// FIXME: Should we use a different Result?
	if (fullCodec->getFrameInfo().size() > i) {
	// This is a partial frame.
	frames.push_back(frame);
	}
	break;
	}

	if (result != SkCodec::kSuccess) {
	ERRORF(r, "Failed to decode frame %i from %s", i, path);
	return;
	}

	frames.push_back(frame);
	}

	// Now decode frames partially, then completely, and compare to the original.
	HaltingStream* haltingStream = new HaltingStream(file, frameByteCounts[0]);
	std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(haltingStream));
	if (!partialCodec) {
	ERRORF(r, "Failed to create a partial codec from %s with %i bytes out of %i",
	path, frameByteCounts[0], file->size());
	return;
	}

	SkASSERT(frameByteCounts.size() > frames.size());
	for (size_t i = 0; i < frames.size(); i++) {
	const size_t fullFrameBytes = frameByteCounts[i + 1];
	const size_t firstHalf = fullFrameBytes / 2;
	const size_t secondHalf = fullFrameBytes - firstHalf;

	haltingStream->addNewData(firstHalf);
	auto frameInfo = partialCodec->getFrameInfo();
	REPORTER_ASSERT(r, frameInfo.size() == i + 1);
	REPORTER_ASSERT(r, !frameInfo[i].fFullyReceived);

	SkBitmap frame;
	frame.allocPixels(info);

	SkCodec::Options opts;
	opts.fFrameIndex = i;
	SkCodec::Result result = partialCodec->startIncrementalDecode(info,
	frame.getPixels(), frame.rowBytes(), &opts);
	if (result != SkCodec::kSuccess) {
	ERRORF(r, "Failed to start incremental decode for %s on frame %i",
	path, i);
	return;
	}

	result = partialCodec->incrementalDecode();
	REPORTER_ASSERT(r, SkCodec::kIncompleteInput == result);

	haltingStream->addNewData(secondHalf);
	result = partialCodec->incrementalDecode();
	REPORTER_ASSERT(r, SkCodec::kSuccess == result);

	frameInfo = partialCodec->getFrameInfo();
	REPORTER_ASSERT(r, frameInfo.size() == i + 1);
	REPORTER_ASSERT(r, frameInfo[i].fFullyReceived);

	// allocPixels locked the pixels for frame, but frames[i] was copied
	// from another bitmap, and did not retain the locked status.
	SkAutoLockPixels alp(frames[i]);
	compare_bitmaps(r, frames[i], frame);
	}
	}

	// Test that calling getPixels when an incremental decode has been
	// started (but not finished) makes the next call to incrementalDecode
	// require a call to startIncrementalDecode.
	static void test_interleaved(skiatest::Reporter* r, const char* name) {
	sk_sp<SkData> file = make_from_resource(name);
	if (!file) {
	return;
	}
	const size_t halfSize = file->size() / 2;
	std::unique_ptr<SkCodec> partialCodec(SkCodec::NewFromStream(
	new HaltingStream(std::move(file), halfSize)));
	if (!partialCodec) {
	ERRORF(r, "Failed to create codec for %s", name);
	return;
	}

	const SkImageInfo info = standardize_info(partialCodec.get());
	SkBitmap incremental;
	incremental.allocPixels(info);

	const SkCodec::Result startResult = partialCodec->startIncrementalDecode(info,
	incremental.getPixels(), incremental.rowBytes());
	if (startResult != SkCodec::kSuccess) {
	ERRORF(r, "Failed to start incremental decode\n");
	return;
	}

	SkCodec::Result result = partialCodec->incrementalDecode();
	REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

	SkBitmap full;
	full.allocPixels(info);
	result = partialCodec->getPixels(info, full.getPixels(), full.rowBytes());
	REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

	// Now incremental decode will fail
	result = partialCodec->incrementalDecode();
	REPORTER_ASSERT(r, result == SkCodec::kInvalidParameters);
	}

	DEF_TEST(Codec_rewind, r) {
	test_interleaved(r, "plane.png");
	test_interleaved(r, "plane_interlaced.png");
	test_interleaved(r, "box.gif");
	}

	// Modified version of the giflib logo, from
	// http://giflib.sourceforge.net/whatsinagif/bits_and_bytes.html
	// The global color map has been replaced with a local color map.
	static unsigned char gNoGlobalColorMap[] = {
	// Header
	0x47, 0x49, 0x46, 0x38, 0x39, 0x61,

	// Logical screen descriptor
	0x0A, 0x00, 0x0A, 0x00, 0x11, 0x00, 0x00,

	// Image descriptor
	0x2C, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x0A, 0x00, 0x81,

	// Local color table
	0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00,

	// Image data
	0x02, 0x16, 0x8C, 0x2D, 0x99, 0x87, 0x2A, 0x1C, 0xDC, 0x33, 0xA0, 0x02, 0x75,
	0xEC, 0x95, 0xFA, 0xA8, 0xDE, 0x60, 0x8C, 0x04, 0x91, 0x4C, 0x01, 0x00,

	// Trailer
	0x3B,
	};

	// Test that a gif file truncated before its local color map behaves as expected.
	DEF_TEST(Codec_GifPreMap, r) {
	sk_sp<SkData> data = SkData::MakeWithoutCopy(gNoGlobalColorMap, sizeof(gNoGlobalColorMap));
	std::unique_ptr<SkCodec> codec(SkCodec::NewFromData(data));
	if (!codec) {
	ERRORF(r, "failed to create codec");
	return;
	}

	SkBitmap truth;
	auto info = standardize_info(codec.get());
	truth.allocPixels(info);

	auto result = codec->getPixels(info, truth.getPixels(), truth.rowBytes());
	REPORTER_ASSERT(r, result == SkCodec::kSuccess);

	// Truncate to 23 bytes, just before the color map. This should fail to decode.
	codec.reset(SkCodec::NewFromData(SkData::MakeWithoutCopy(gNoGlobalColorMap, 23)));
	REPORTER_ASSERT(r, codec);
	if (codec) {
	SkBitmap bm;
	bm.allocPixels(info);
	result = codec->getPixels(info, bm.getPixels(), bm.rowBytes());
	REPORTER_ASSERT(r, result == SkCodec::kInvalidInput);
	}

	// Again, truncate to 23 bytes, this time for an incremental decode. We
	// cannot start an incremental decode until we have more data. If we did,
	// we would be using the wrong color table.
	HaltingStream* stream = new HaltingStream(data, 23);
	codec.reset(SkCodec::NewFromStream(stream));
	REPORTER_ASSERT(r, codec);
	if (codec) {
	SkBitmap bm;
	bm.allocPixels(info);
	result = codec->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes());
	REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);

	stream->addNewData(data->size());
	result = codec->startIncrementalDecode(info, bm.getPixels(), bm.rowBytes());
	REPORTER_ASSERT(r, result == SkCodec::kSuccess);

	result = codec->incrementalDecode();
	REPORTER_ASSERT(r, result == SkCodec::kSuccess);
	compare_bitmaps(r, truth, bm);
	}
	}