nsresult
FileReader::GetAsText(Blob *aBlob,
const nsACString &aCharset,
const char *aFileData,
uint32_t aDataLen,
nsAString& aResult)
{
// Try the API argument.
const Encoding* encoding = Encoding::ForLabel(aCharset);
if (!encoding) {
// API argument failed. Try the type property of the blob.
nsAutoString type16;
aBlob->GetType(type16);
NS_ConvertUTF16toUTF8 type(type16);
nsAutoCString specifiedCharset;
bool haveCharset;
int32_t charsetStart, charsetEnd;
NS_ExtractCharsetFromContentType(type,
specifiedCharset,
&haveCharset,
&charsetStart,
&charsetEnd);
encoding = Encoding::ForLabel(specifiedCharset);
if (!encoding) {
// Type property failed. Use UTF-8.
encoding = UTF_8_ENCODING;
}
}
auto data = MakeSpan(reinterpret_cast<const uint8_t*>(aFileData),
aDataLen);
nsresult rv;
Tie(rv, encoding) = encoding->Decode(data, aResult);
return NS_FAILED(rv) ? rv : NS_OK;
}
void
TextEncoder::Encode(JSContext* aCx,
JS::Handle<JSObject*> aObj,
const nsAString& aString,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv)
{
nsAutoCString utf8;
nsresult rv;
const Encoding* ignored;
Tie(rv, ignored) = UTF_8_ENCODING->Encode(aString, utf8);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
JSAutoCompartment ac(aCx, aObj);
JSObject* outView = Uint8Array::Create(
aCx, utf8.Length(), reinterpret_cast<const uint8_t*>(utf8.BeginReading()));
if (!outView) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
aRetval.set(outView);
}
RasterImage::GetImageContainer(LayerManager* aManager, uint32_t aFlags)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aManager);
MOZ_ASSERT((aFlags & ~(FLAG_SYNC_DECODE |
FLAG_SYNC_DECODE_IF_FAST |
FLAG_ASYNC_NOTIFY))
== FLAG_NONE,
"Unsupported flag passed to GetImageContainer");
int32_t maxTextureSize = aManager->GetMaxTextureSize();
if (!mHasSize ||
mSize.width > maxTextureSize ||
mSize.height > maxTextureSize) {
return nullptr;
}
if (IsUnlocked() && mProgressTracker) {
mProgressTracker->OnUnlockedDraw();
}
RefPtr<layers::ImageContainer> container = mImageContainer.get();
bool mustRedecode =
(aFlags & (FLAG_SYNC_DECODE | FLAG_SYNC_DECODE_IF_FAST)) &&
mLastImageContainerDrawResult != DrawResult::SUCCESS &&
mLastImageContainerDrawResult != DrawResult::BAD_IMAGE;
if (container && !mustRedecode) {
return container.forget();
}
// We need a new ImageContainer, so create one.
container = LayerManager::CreateImageContainer();
DrawResult drawResult;
RefPtr<layers::Image> image;
Tie(drawResult, image) = GetCurrentImage(container, aFlags);
if (!image) {
return nullptr;
}
// |image| holds a reference to a SourceSurface which in turn holds a lock on
// the current frame's VolatileBuffer, ensuring that it doesn't get freed as
// long as the layer system keeps this ImageContainer alive.
AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
imageList.AppendElement(ImageContainer::NonOwningImage(image, TimeStamp(),
mLastFrameID++,
mImageProducerID));
container->SetCurrentImagesInTransaction(imageList);
mLastImageContainerDrawResult = drawResult;
mImageContainer = container;
return container.forget();
}
Pair<DrawResult, RefPtr<layers::Image>>
RasterImage::GetCurrentImage(ImageContainer* aContainer, uint32_t aFlags)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aContainer);
DrawResult drawResult;
RefPtr<SourceSurface> surface;
Tie(drawResult, surface) =
GetFrameInternal(mSize, FRAME_CURRENT, aFlags | FLAG_ASYNC_NOTIFY);
if (!surface) {
// The OS threw out some or all of our buffer. We'll need to wait for the
// redecode (which was automatically triggered by GetFrame) to complete.
return MakePair(drawResult, RefPtr<layers::Image>());
}
RefPtr<layers::Image> image = new layers::SourceSurfaceImage(surface);
return MakePair(drawResult, Move(image));
}
ClippedImage::Draw(gfxContext* aContext,
const nsIntSize& aSize,
const ImageRegion& aRegion,
uint32_t aWhichFrame,
SamplingFilter aSamplingFilter,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags,
float aOpacity)
{
if (!ShouldClip()) {
return InnerImage()->Draw(aContext, aSize, aRegion, aWhichFrame,
aSamplingFilter, aSVGContext, aFlags, aOpacity);
}
// Check for tiling. If we need to tile then we need to create a
// gfxCallbackDrawable to handle drawing for us.
if (MustCreateSurface(aContext, aSize, aRegion, aFlags)) {
// Create a temporary surface containing a single tile of this image.
// GetFrame will call DrawSingleTile internally.
DrawResult result;
RefPtr<SourceSurface> surface;
Tie(result, surface) =
GetFrameInternal(aSize, aSVGContext, aWhichFrame, aFlags, aOpacity);
if (!surface) {
MOZ_ASSERT(result != DrawResult::SUCCESS);
return result;
}
// Create a drawable from that surface.
RefPtr<gfxSurfaceDrawable> drawable =
new gfxSurfaceDrawable(surface, aSize);
// Draw.
gfxUtils::DrawPixelSnapped(aContext, drawable, aSize, aRegion,
SurfaceFormat::B8G8R8A8, aSamplingFilter,
aOpacity);
return result;
}
return DrawSingleTile(aContext, aSize, aRegion, aWhichFrame,
aSamplingFilter, aSVGContext, aFlags, aOpacity);
}
void
RasterImage::UpdateImageContainer()
{
MOZ_ASSERT(NS_IsMainThread());
RefPtr<layers::ImageContainer> container = mImageContainer.get();
if (!container) {
return;
}
DrawResult drawResult;
RefPtr<layers::Image> image;
Tie(drawResult, image) = GetCurrentImage(container, FLAG_NONE);
if (!image) {
return;
}
mLastImageContainerDrawResult = drawResult;
AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
imageList.AppendElement(ImageContainer::NonOwningImage(image, TimeStamp(),
mLastFrameID++,
mImageProducerID));
container->SetCurrentImages(imageList);
}
inline static constexpr Tie createTie(void *ptr) noexcept {return Tie(ptr);}
void TupleTutorial()
{
/// . Tuples
/// Template class `Tuple` allows combining 2-4 values with
/// different types. These are principally similar to `std::tuple`, with some advantages.
/// Unlike `std::tuple`, individual elements are directly accessible as member variables
/// `a`..`d`, `Tuple` supports persistent storage patterns (`Serialize`, `Jsonize`, `Xmlize`), hash
/// code (`GetHashValue`), conversion to `String` and Value conversions.
/// To create a `Tuple` value, you can use the `MakeTuple` function.
Tuple<int, String, String> x = MakeTuple(12, "hello", "world");
/// Individual values are accessible as members `a` .. `d`:
DUMP(x.a);
DUMP(x.b);
DUMP(x.c);
/// Or using `Get`:
DUMP(x.Get<1>());
DUMP(x.Get<int>());
/// As long as all individual types have conversion to `String` (`AsString`), the tuple also
/// has such conversion and thus can e.g. be easily logged:
DUMP(x);
/// As long as individual types have defined `GetHashValue`, so does `Tuple`:
DUMP(GetHashValue(x));
/// As long as individual types have defined `operator==`, `Tuple` has defined `operator==`
/// and `operator!=`:
Tuple<int, String, String> y = x;
DUMP(x == y);
DUMP(x != y);
y.a++;
DUMP(x == y);
DUMP(x != y);
/// As long as all individual types have defined `SgnCompare`,
/// Tuple has SgnCompare, Compare method and operators <, <=, >, >=:
DUMP(x.Compare(y));
DUMP(SgnCompare(x, y));
DUMP(x < y);
/// GetCount returns the width of `Tuple`:
DUMP(x.GetCount());
/// Elements that are directly convertible with `Value` can be 'Get'/'Set':
for(int i = 0; i < x.GetCount(); i++)
DUMP(x.Get(i));
///
x.Set(1, "Hi");
DUMP(x);
/// As long as all individual types are convertible with `Value`, you can convert Tuple to
/// `ValueArray` and back:
ValueArray va = x.GetArray();
DUMP(va);
va.Set(2, "Joe");
x.SetArray(va);
/// It is OK to assign `Tuple` to `Tuple` with different individual types, as long as types
/// are directly convertible:
Tuple<double, String, String> d = x;
DUMP(d);
/// Tie can be used to assign tuple to l-values:
int i;
String s1, s2;
Tie(i, s1, s2) = x;
DUMP(i);
DUMP(s1);
DUMP(s2);
/// U++ Tuples are carefully designed as POD type, which allows POD arrays to be intialized
/// with classic C style:
static Tuple2<int, const char *> map[] = {
{ 1, "one" },
{ 2, "one" },
{ 3, "one" },
};
/// Simple FindTuple template function is provided to search for tuple based on the first
/// value (`a`) (linear O(n) search):
DUMP(FindTuple(map, __countof(map), 3)->b);
///
}
void CEgIStream::Tie( const UtilStr* inSource ) {
Tie( inSource -> getCStr(), inSource -> length() );
}