C++ SkToU32函数代码示例

void GrVkPipelineState::BuildStateKey(const GrPipeline& pipeline, GrPrimitiveType primitiveType,
                                      SkTArray<uint8_t, true>* key) {
    // Save room for the key length and key header
    key->reset();
    key->push_back_n(kData_StateKeyOffset);

    GrProcessorKeyBuilder b(key);

    GrVkRenderTarget* vkRT = (GrVkRenderTarget*)pipeline.getRenderTarget();
    vkRT->simpleRenderPass()->genKey(&b);

    pipeline.getStencil().genKey(&b);

    SkASSERT(sizeof(GrPipelineBuilder::DrawFace) <= sizeof(uint32_t));
    b.add32(pipeline.getDrawFace());

    b.add32(get_blend_info_key(pipeline));

    b.add32(primitiveType);

    // Set key length
    int keyLength = key->count();
    SkASSERT(0 == (keyLength % 4));
    *reinterpret_cast<uint32_t*>(key->begin()) = SkToU32(keyLength);
}

static void read_string(SkStream* stream, SkString* string) {
    const uint32_t length = SkToU32(stream->readPackedUInt());
    if (length > 0) {
        string->resize(length);
        stream->read(string->writable_str(), length);
    }
}

int SkPipeDeduper::findOrDefineFactory(SkFlattenable* flattenable) {
    if (!flattenable) {
        return 0;
    }

    int index = fFactories.find(flattenable->getFactory());
    SkASSERT(index >= 0);
    if (index) {
        if (show_deduper_traffic) {
            SkDebugf("  reuseFactory(%d)\n", index - 1);
        }
        return index;
    }

    index = fFactories.add(flattenable->getFactory());
    ASSERT_FITS_IN(index, kIndex_DefineFactoryExtraBits);
    const char* name = flattenable->getTypeName();
    size_t len = strlen(name);
    ASSERT_FITS_IN(len, kNameLength_DefineFactoryExtraBits);
    unsigned extra = (index << kNameLength_DefineFactoryExtraBits) | len;
    size_t prevWritten = fStream->bytesWritten();
    fStream->write32(pack_verb(SkPipeVerb::kDefineFactory, extra));
    write_pad(fStream, name, len + 1);
    if (false) {
        SkDebugf("  defineFactory(%d) %d %s\n",
             index - 1, SkToU32(fStream->bytesWritten() - prevWritten), name);
    }
    return index;
}

static void write_encoded_bitmap(SkWriteBuffer* buffer, SkData* data,
                                 const SkIPoint& origin) {
    buffer->writeUInt(SkToU32(data->size()));
    buffer->getWriter32()->writePad(data->data(), data->size());
    buffer->write32(origin.fX);
    buffer->write32(origin.fY);
}

// Asserts that asset == expected and is peekable.
static void stream_peek_test(skiatest::Reporter* rep,
                             SkStreamAsset* asset,
                             const SkData* expected) {
    if (asset->getLength() != expected->size()) {
        ERRORF(rep, "Unexpected length.");
        return;
    }
    SkRandom rand;
    uint8_t buffer[4096];
    const uint8_t* expect = expected->bytes();
    for (size_t i = 0; i < asset->getLength(); ++i) {
        uint32_t maxSize =
                SkToU32(SkTMin(sizeof(buffer), asset->getLength() - i));
        size_t size = rand.nextRangeU(1, maxSize);
        SkASSERT(size >= 1);
        SkASSERT(size <= sizeof(buffer));
        SkASSERT(size + i <= asset->getLength());
        if (asset->peek(buffer, size) < size) {
            ERRORF(rep, "Peek Failed!");
            return;
        }
        if (0 != memcmp(buffer, &expect[i], size)) {
            ERRORF(rep, "Peek returned wrong bytes!");
            return;
        }
        uint8_t value;
        REPORTER_ASSERT(rep, 1 == asset->read(&value, 1));
        if (value != expect[i]) {
            ERRORF(rep, "Read Failed!");
            return;
        }
    }
}

size_t SkPictureRecord::recordRestoreOffsetPlaceholder(SkClipOp op) {
    if (fRestoreOffsetStack.isEmpty()) {
        return -1;
    }

    // The RestoreOffset field is initially filled with a placeholder
    // value that points to the offset of the previous RestoreOffset
    // in the current stack level, thus forming a linked list so that
    // the restore offsets can be filled in when the corresponding
    // restore command is recorded.
    int32_t prevOffset = fRestoreOffsetStack.top();

    if (clipOpExpands(op)) {
        // Run back through any previous clip ops, and mark their offset to
        // be 0, disabling their ability to trigger a jump-to-restore, otherwise
        // they could hide this clips ability to expand the clip (i.e. go from
        // empty to non-empty).
        this->fillRestoreOffsetPlaceholdersForCurrentStackLevel(0);

        // Reset the pointer back to the previous clip so that subsequent
        // restores don't overwrite the offsets we just cleared.
        prevOffset = 0;
    }

    size_t offset = fWriter.bytesWritten();
    this->addInt(prevOffset);
    fRestoreOffsetStack.top() = SkToU32(offset);
    return offset;
}

void SkPipeCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint pts[],
                                const SkPaint& paint) {
    SkPipeWriter writer(this);
    writer.write32(pack_verb(SkPipeVerb::kDrawPoints, mode));
    writer.write32(SkToU32(count));
    writer.write(pts, count * sizeof(SkPoint));
    write_paint(writer, paint, kGeometry_PaintUsage | kRespectsStroke_PaintUsage);
}

size_t SkBinaryWriteBuffer::writeStream(SkStream* stream, size_t length) {
    fWriter.write32(SkToU32(length));
    size_t bytesWritten = fWriter.readFromStream(stream, length);
    if (bytesWritten < length) {
        fWriter.reservePad(length - bytesWritten);
    }
    return bytesWritten;
}

void SkPictureStateTree::appendNode(size_t offset) {
    Node* n = static_cast<Node*>(fAlloc.allocThrow(sizeof(Node)));
    n->fOffset = SkToU32(offset);
    n->fFlags = 0;
    n->fParent = fCurrentState.fNode;
    n->fLevel = fCurrentState.fNode->fLevel + 1;
    n->fMatrix = fCurrentState.fMatrix;
    fCurrentState.fNode = n;
}

/*static*/ bool SkBitmapHasher::ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result) {
    SkMD5 out;

    // start with the x/y dimensions
    write_int32_to_buffer(SkToU32(bitmap.width()), &out);
    write_int32_to_buffer(SkToU32(bitmap.height()), &out);

    // add all the pixel data
    SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
    if (!enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality)) {
        return false;
    }

    SkMD5::Digest digest;
    out.finish(digest);
    *result = first_8_bytes_as_uint64(digest.data);
    return true;
}

void GrGLProgramDesc::finalize() {
    int keyLength = fKey.count();
    SkASSERT(0 == (keyLength % 4));
    *this->atOffset<uint32_t, kLengthOffset>() = SkToU32(keyLength);

    uint32_t* checksum = this->atOffset<uint32_t, kChecksumOffset>();
    *checksum = 0;
    *checksum = SkChecksum::Compute(reinterpret_cast<uint32_t*>(fKey.begin()), keyLength);
}

void SkPipeCanvas::onDrawAnnotation(const SkRect& rect, const char key[], SkData* data) {
    const size_t len = strlen(key) + 1; // must write the trailing 0
    bool compact = fits_in(len, 23);
    uint32_t extra = compact ? (unsigned)len : 0;
    extra <<= 1;   // make room for has_data_sentinel
    if (data) {
        extra |= 1;
    }

    fStream->write32(pack_verb(SkPipeVerb::kDrawAnnotation, extra));
    fStream->write(&rect, sizeof(SkRect));
    if (!compact) {
        fStream->write32(SkToU32(len));
    }
    write_pad(fStream, key, len);
    if (data) {
        fStream->write32(SkToU32(data->size()));
        write_pad(fStream, data->data(), data->size());
    }
}

void SkGPipeCanvas::onDrawPoints(PointMode mode, size_t count,
                                 const SkPoint pts[], const SkPaint& paint) {
    if (count) {
        NOTIFY_SETUP(this);
        this->writePaint(paint);
        if (this->needOpBytes(4 + count * sizeof(SkPoint))) {
            this->writeOp(kDrawPoints_DrawOp, mode, 0);
            fWriter.write32(SkToU32(count));
            fWriter.write(pts, count * sizeof(SkPoint));
        }
    }
}

static size_t writeTypeface(SkWriter32* writer, SkTypeface* typeface) {
    SkASSERT(typeface);
    SkDynamicMemoryWStream stream;
    typeface->serialize(&stream);
    size_t size = stream.getOffset();
    if (writer) {
        writer->write32(SkToU32(size));
        SkAutoDataUnref data(stream.copyToData());
        writer->writePad(data->data(), size);
    }
    return 4 + SkAlign4(size);
}

/*static*/ bool SkBitmapHasher::ComputeDigestInternal(const SkBitmap& bitmap,
                                                      SkHashDigest *result) {
    size_t pixelBufferSize = bitmap.width() * bitmap.height() * 4;
    size_t totalBufferSize = pixelBufferSize + 2 * sizeof(uint32_t);

    SkAutoMalloc bufferManager(totalBufferSize);
    char *bufferStart = static_cast<char *>(bufferManager.get());
    SkMemoryWStream out(bufferStart, totalBufferSize);

    // start with the x/y dimensions
    write_int_to_buffer(SkToU32(bitmap.width()), &out);
    write_int_to_buffer(SkToU32(bitmap.height()), &out);

    // add all the pixel data
    SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
    if (!enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality)) {
        return false;
    }

    *result = SkCityHash::Compute64(bufferStart, totalBufferSize);
    return true;
}