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/*
* 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 "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) {
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(std::move(data)));
if (!codec) {
return false;
}
const SkImageInfo info = standardize_info(codec);
dst->allocPixels(info);
return SkCodec::kSuccess == codec->getPixels(info, dst->getPixels(), dst->rowBytes());
}
/*
* Represents a stream without all of its data.
*/
class HaltingStream : public SkStream {
public:
HaltingStream(sk_sp<SkData> data)
: fTotalSize(data->size())
, fLimit(fTotalSize / 2)
, fStream(std::move(data))
{}
void addNewData() {
// Arbitrary size, but deliberately different from
// the buffer size used by SkPngCodec.
fLimit = SkTMin(fTotalSize, fLimit + 1000);
}
size_t read(void* buffer, size_t size) override {
if (fStream.getPosition() + size > fLimit) {
size = fLimit - fStream.getPosition();
}
return fStream.read(buffer, size);
}
bool isAtEnd() const override {
return fStream.isAtEnd();
}
bool hasPosition() const override { return true; }
size_t getPosition() const override { return fStream.getPosition(); }
bool rewind() override { return fStream.rewind(); }
bool move(long offset) override { return fStream.move(offset); }
private:
const size_t fTotalSize;
size_t fLimit;
SkMemoryStream fStream;
};
static void test_partial(skiatest::Reporter* r, const char* name) {
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;
}
const size_t fileSize = file->size();
// Now decode part of the file
HaltingStream* stream = new HaltingStream(file);
// Note that we cheat and hold on to a pointer to stream, though it is owned by
// partialCodec.
SkAutoTDelete<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);
SkASSERT(info == truth.info());
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;
}
while (true) {
const SkCodec::Result result = partialCodec->incrementalDecode();
if (stream->getPosition() == fileSize) {
REPORTER_ASSERT(r, result == SkCodec::kSuccess);
break;
}
SkASSERT(stream->getPosition() < fileSize);
REPORTER_ASSERT(r, result == SkCodec::kIncompleteInput);
// Append an arbitrary amount of data.
stream->addNewData();
}
// compare to original
for (int i = 0; i < info.height(); i++) {
REPORTER_ASSERT(r, !memcmp(truth.getAddr(0, 0), incremental.getAddr(0, 0),
info.minRowBytes()));
}
}
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 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);
SkAutoTDelete<SkCodec> partialCodec(SkCodec::NewFromStream(
new HaltingStream(std::move(file))));
if (!partialCodec) {
ERRORF(r, "Failed to create codec for %s", name);
return;
}
const SkImageInfo info = standardize_info(partialCodec);
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");
}
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