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90 lines
2.5 KiB
90 lines
2.5 KiB
// Copyright 2017 The Android Open Source Project
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//
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// This software is licensed under the terms of the GNU General Public
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// License version 2, as published by the Free Software Foundation, and
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// may be copied, distributed, and modified under those terms.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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#include "snapshot/TextureLoader.h"
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#include "base/EintrWrapper.h"
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#include "base/DecompressingStream.h"
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#include <assert.h>
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using android::base::DecompressingStream;
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namespace android {
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namespace snapshot {
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TextureLoader::TextureLoader(android::base::StdioStream&& stream)
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: mStream(std::move(stream)) {}
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bool TextureLoader::start() {
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if (mStarted) {
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return !mHasError;
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}
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mStarted = true;
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bool res = readIndex();
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if (!res) {
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mHasError = true;
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return false;
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}
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return true;
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}
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void TextureLoader::loadTexture(uint32_t texId, const loader_t& loader) {
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android::base::AutoLock scopedLock(mLock);
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assert(mIndex.count(texId));
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HANDLE_EINTR(fseeko64(mStream.get(), mIndex[texId], SEEK_SET));
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switch (mVersion) {
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case 1:
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loader(&mStream);
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break;
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case 2: {
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DecompressingStream stream(mStream);
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loader(&stream);
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}
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}
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if (ferror(mStream.get())) {
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mHasError = true;
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}
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}
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bool TextureLoader::readIndex() {
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#if SNAPSHOT_PROFILE > 1
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auto start = android::base::System::get()->getHighResTimeUs();
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#endif
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assert(mIndex.size() == 0);
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uint64_t size;
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if (base::getFileSize(fileno(mStream.get()), &size)) {
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mDiskSize = size;
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}
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auto indexPos = mStream.getBe64();
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HANDLE_EINTR(fseeko64(mStream.get(), static_cast<int64_t>(indexPos), SEEK_SET));
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mVersion = mStream.getBe32();
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if (mVersion < 1 || mVersion > 2) {
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return false;
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}
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uint32_t texCount = mStream.getBe32();
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mIndex.reserve(texCount);
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for (uint32_t i = 0; i < texCount; i++) {
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uint32_t tex = mStream.getBe32();
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uint64_t filePos = mStream.getBe64();
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mIndex.emplace(tex, filePos);
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}
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#if SNAPSHOT_PROFILE > 1
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printf("Texture readIndex() time: %.03f\n",
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(android::base::System::get()->getHighResTimeUs() - start) / 1000.0);
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#endif
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return true;
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}
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} // namespace snapshot
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} // namespace android
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