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e37e4cf2d7
Also, avoid calling SendFindImageText() on unsupported platforms, so that test_image_recognition_unsupported.html will pass. Differential Revision: https://phabricator.services.mozilla.com/D191678
129 lines
4.6 KiB
C++
129 lines
4.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TextRecognition.h"
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#include "mozilla/dom/Promise.h"
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#include "mozilla/dom/ShadowRoot.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/ContentChild.h"
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#include "nsTextNode.h"
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#include "imgIContainer.h"
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using namespace mozilla::dom;
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namespace mozilla::widget {
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auto TextRecognition::FindText(imgIContainer& aImage,
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const nsTArray<nsCString>& aLanguages)
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-> RefPtr<NativePromise> {
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// TODO: Maybe decode async.
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RefPtr<gfx::SourceSurface> surface = aImage.GetFrame(
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imgIContainer::FRAME_CURRENT,
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imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
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if (NS_WARN_IF(!surface)) {
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return NativePromise::CreateAndReject("Failed to get surface"_ns, __func__);
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}
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RefPtr<gfx::DataSourceSurface> dataSurface = surface->GetDataSurface();
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if (NS_WARN_IF(!dataSurface)) {
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return NativePromise::CreateAndReject("Failed to get data surface"_ns,
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__func__);
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}
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return FindText(*dataSurface, aLanguages);
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}
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auto TextRecognition::FindText(gfx::DataSourceSurface& aSurface,
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const nsTArray<nsCString>& aLanguages)
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-> RefPtr<NativePromise> {
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if (!IsSupported()) {
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return NativePromise::CreateAndReject("Text recognition not available"_ns,
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__func__);
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}
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if (XRE_IsContentProcess()) {
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auto* contentChild = ContentChild::GetSingleton();
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auto image = nsContentUtils::SurfaceToIPCImage(aSurface);
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if (!image) {
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return NativePromise::CreateAndReject("Failed to share data surface"_ns,
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__func__);
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}
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auto promise = MakeRefPtr<NativePromise::Private>(__func__);
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contentChild->SendFindImageText(std::move(*image), aLanguages)
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->Then(
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GetCurrentSerialEventTarget(), __func__,
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[promise](TextRecognitionResultOrError&& aResultOrError) {
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switch (aResultOrError.type()) {
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case TextRecognitionResultOrError::Type::TTextRecognitionResult:
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promise->Resolve(
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std::move(aResultOrError.get_TextRecognitionResult()),
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__func__);
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break;
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case TextRecognitionResultOrError::Type::TnsCString:
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promise->Reject(std::move(aResultOrError.get_nsCString()),
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__func__);
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown result?");
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promise->Reject("Unknown error"_ns, __func__);
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break;
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}
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},
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[promise](mozilla::ipc::ResponseRejectReason) {
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promise->Reject("IPC rejection"_ns, __func__);
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});
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return promise;
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}
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return DoFindText(aSurface, aLanguages);
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}
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void TextRecognition::FillShadow(ShadowRoot& aShadow,
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const TextRecognitionResult& aResult) {
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auto& doc = *aShadow.OwnerDoc();
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RefPtr<Element> div = doc.CreateHTMLElement(nsGkAtoms::div);
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for (const auto& quad : aResult.quads()) {
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RefPtr<Element> span = doc.CreateHTMLElement(nsGkAtoms::span);
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// TODO: We probably want to position them here and so on. For now, expose
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// the data as attributes so that it's easy to play with the returned values
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// in JS.
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{
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nsAutoString points;
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for (const auto& point : quad.points()) {
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points.AppendFloat(point.x);
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points.Append(u',');
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points.AppendFloat(point.y);
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points.Append(u',');
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}
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points.Trim(",");
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span->SetAttribute(u"data-points"_ns, points, IgnoreErrors());
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nsAutoString confidence;
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confidence.AppendFloat(quad.confidence());
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span->SetAttribute(u"data-confidence"_ns, confidence, IgnoreErrors());
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}
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{
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RefPtr<nsTextNode> text = doc.CreateTextNode(quad.string());
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span->AppendChildTo(text, true, IgnoreErrors());
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}
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div->AppendChildTo(span, true, IgnoreErrors());
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}
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aShadow.AppendChildTo(div, true, IgnoreErrors());
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}
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#ifndef XP_MACOSX
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auto TextRecognition::DoFindText(gfx::DataSourceSurface&,
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const nsTArray<nsCString>&)
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-> RefPtr<NativePromise> {
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MOZ_CRASH("DoFindText is not implemented on this platform");
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}
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#endif
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bool TextRecognition::IsSupported() {
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#ifdef XP_MACOSX
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return true;
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#else
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return false;
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#endif
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}
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} // namespace mozilla::widget
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