зеркало из https://github.com/mozilla/gecko-dev.git
287 строки
9.3 KiB
C++
287 строки
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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 "CanvasRenderingContextHelper.h"
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#include "ImageBitmapRenderingContext.h"
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#include "ImageEncoder.h"
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#include "mozilla/dom/CanvasRenderingContext2D.h"
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#include "mozilla/GfxMessageUtils.h"
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#include "mozilla/Telemetry.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/webgpu/CanvasContext.h"
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#include "MozFramebuffer.h"
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#include "nsContentUtils.h"
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#include "nsDOMJSUtils.h"
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#include "nsIScriptContext.h"
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#include "nsJSUtils.h"
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#include "ClientWebGLContext.h"
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namespace mozilla {
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namespace dom {
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CanvasRenderingContextHelper::CanvasRenderingContextHelper()
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: mCurrentContextType(CanvasContextType::NoContext) {}
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void CanvasRenderingContextHelper::ToBlob(
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JSContext* aCx, nsIGlobalObject* aGlobal, BlobCallback& aCallback,
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const nsAString& aType, JS::Handle<JS::Value> aParams, bool aUsePlaceholder,
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ErrorResult& aRv) {
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// Encoder callback when encoding is complete.
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class EncodeCallback : public EncodeCompleteCallback {
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public:
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EncodeCallback(nsIGlobalObject* aGlobal, BlobCallback* aCallback)
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: mGlobal(aGlobal), mBlobCallback(aCallback) {}
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// This is called on main thread.
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MOZ_CAN_RUN_SCRIPT
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nsresult ReceiveBlobImpl(already_AddRefed<BlobImpl> aBlobImpl) override {
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RefPtr<BlobImpl> blobImpl = aBlobImpl;
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RefPtr<Blob> blob;
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if (blobImpl) {
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blob = Blob::Create(mGlobal, blobImpl);
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}
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RefPtr<BlobCallback> callback(std::move(mBlobCallback));
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ErrorResult rv;
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callback->Call(blob, rv);
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mGlobal = nullptr;
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MOZ_ASSERT(!mBlobCallback);
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return rv.StealNSResult();
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}
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nsCOMPtr<nsIGlobalObject> mGlobal;
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RefPtr<BlobCallback> mBlobCallback;
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};
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RefPtr<EncodeCompleteCallback> callback =
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new EncodeCallback(aGlobal, &aCallback);
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ToBlob(aCx, aGlobal, callback, aType, aParams, aUsePlaceholder, aRv);
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}
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void CanvasRenderingContextHelper::ToBlob(
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JSContext* aCx, nsIGlobalObject* aGlobal, EncodeCompleteCallback* aCallback,
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const nsAString& aType, JS::Handle<JS::Value> aParams, bool aUsePlaceholder,
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ErrorResult& aRv) {
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nsAutoString type;
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nsContentUtils::ASCIIToLower(aType, type);
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nsAutoString params;
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bool usingCustomParseOptions;
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aRv = ParseParams(aCx, type, aParams, params, &usingCustomParseOptions);
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if (aRv.Failed()) {
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return;
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}
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if (mCurrentContext) {
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// We disallow canvases of width or height zero, and set them to 1, so
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// we will have a discrepancy with the sizes of the canvas and the context.
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// That discrepancy is OK, the rest are not.
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nsIntSize elementSize = GetWidthHeight();
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if ((elementSize.width != mCurrentContext->GetWidth() &&
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(elementSize.width != 0 || mCurrentContext->GetWidth() != 1)) ||
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(elementSize.height != mCurrentContext->GetHeight() &&
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(elementSize.height != 0 || mCurrentContext->GetHeight() != 1))) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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}
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UniquePtr<uint8_t[]> imageBuffer;
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int32_t format = 0;
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if (mCurrentContext) {
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imageBuffer = mCurrentContext->GetImageBuffer(&format);
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}
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RefPtr<EncodeCompleteCallback> callback = aCallback;
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aRv = ImageEncoder::ExtractDataAsync(
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type, params, usingCustomParseOptions, std::move(imageBuffer), format,
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GetWidthHeight(), aUsePlaceholder, callback);
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}
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already_AddRefed<nsICanvasRenderingContextInternal>
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CanvasRenderingContextHelper::CreateContext(CanvasContextType aContextType) {
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return CreateContextHelper(aContextType, layers::LayersBackend::LAYERS_NONE);
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}
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already_AddRefed<nsICanvasRenderingContextInternal>
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CanvasRenderingContextHelper::CreateContextHelper(
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CanvasContextType aContextType, layers::LayersBackend aCompositorBackend) {
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MOZ_ASSERT(aContextType != CanvasContextType::NoContext);
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RefPtr<nsICanvasRenderingContextInternal> ret;
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switch (aContextType) {
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case CanvasContextType::NoContext:
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break;
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case CanvasContextType::Canvas2D:
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Telemetry::Accumulate(Telemetry::CANVAS_2D_USED, 1);
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ret = new CanvasRenderingContext2D(aCompositorBackend);
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break;
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case CanvasContextType::WebGL1:
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
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ret = new ClientWebGLContext(/*webgl2:*/ false);
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if (!ret) return nullptr;
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break;
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case CanvasContextType::WebGL2:
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_USED, 1);
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ret = new ClientWebGLContext(/*webgl2:*/ true);
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if (!ret) return nullptr;
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break;
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case CanvasContextType::WebGPU:
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// TODO
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// Telemetry::Accumulate(Telemetry::CANVAS_WEBGPU_USED, 1);
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ret = new webgpu::CanvasContext();
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if (!ret) return nullptr;
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break;
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case CanvasContextType::ImageBitmap:
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ret = new ImageBitmapRenderingContext();
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break;
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}
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MOZ_ASSERT(ret);
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return ret.forget();
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}
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already_AddRefed<nsISupports> CanvasRenderingContextHelper::GetContext(
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JSContext* aCx, const nsAString& aContextId,
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JS::Handle<JS::Value> aContextOptions, ErrorResult& aRv) {
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CanvasContextType contextType;
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if (!CanvasUtils::GetCanvasContextType(aContextId, &contextType))
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return nullptr;
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if (!mCurrentContext) {
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// This canvas doesn't have a context yet.
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RefPtr<nsICanvasRenderingContextInternal> context;
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context = CreateContext(contextType);
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if (!context) {
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return nullptr;
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}
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// Ensure that the context participates in CC. Note that returning a
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// CC participant from QI doesn't addref.
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nsXPCOMCycleCollectionParticipant* cp = nullptr;
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CallQueryInterface(context, &cp);
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if (!cp) {
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aRv.Throw(NS_ERROR_FAILURE);
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return nullptr;
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}
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mCurrentContext = std::move(context);
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mCurrentContextType = contextType;
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nsresult rv = UpdateContext(aCx, aContextOptions, aRv);
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if (NS_FAILED(rv)) {
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// See bug 645792 and bug 1215072.
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// We want to throw only if dictionary initialization fails,
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// so only in case aRv has been set to some error value.
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if (contextType == CanvasContextType::WebGL1)
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 0);
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else if (contextType == CanvasContextType::WebGL2)
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 0);
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else if (contextType == CanvasContextType::WebGPU) {
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// Telemetry::Accumulate(Telemetry::CANVAS_WEBGPU_SUCCESS, 0);
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}
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return nullptr;
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}
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if (contextType == CanvasContextType::WebGL1)
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL_SUCCESS, 1);
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else if (contextType == CanvasContextType::WebGL2)
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Telemetry::Accumulate(Telemetry::CANVAS_WEBGL2_SUCCESS, 1);
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else if (contextType == CanvasContextType::WebGPU) {
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// Telemetry::Accumulate(Telemetry::CANVAS_WEBGPU_SUCCESS, 1);
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}
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} else {
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// We already have a context of some type.
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if (contextType != mCurrentContextType) return nullptr;
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}
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nsCOMPtr<nsICanvasRenderingContextInternal> context = mCurrentContext;
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return context.forget();
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}
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nsresult CanvasRenderingContextHelper::UpdateContext(
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JSContext* aCx, JS::Handle<JS::Value> aNewContextOptions,
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ErrorResult& aRvForDictionaryInit) {
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if (!mCurrentContext) return NS_OK;
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nsIntSize sz = GetWidthHeight();
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nsCOMPtr<nsICanvasRenderingContextInternal> currentContext = mCurrentContext;
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currentContext->SetOpaqueValueFromOpaqueAttr(GetOpaqueAttr());
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nsresult rv = currentContext->SetContextOptions(aCx, aNewContextOptions,
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aRvForDictionaryInit);
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if (NS_FAILED(rv)) {
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mCurrentContext = nullptr;
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return rv;
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}
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rv = currentContext->SetDimensions(sz.width, sz.height);
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if (NS_FAILED(rv)) {
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mCurrentContext = nullptr;
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}
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return rv;
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}
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nsresult CanvasRenderingContextHelper::ParseParams(
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JSContext* aCx, const nsAString& aType, const JS::Value& aEncoderOptions,
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nsAString& outParams, bool* const outUsingCustomParseOptions) {
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// Quality parameter is only valid for the image/jpeg MIME type
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if (aType.EqualsLiteral("image/jpeg")) {
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if (aEncoderOptions.isNumber()) {
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double quality = aEncoderOptions.toNumber();
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// Quality must be between 0.0 and 1.0, inclusive
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if (quality >= 0.0 && quality <= 1.0) {
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outParams.AppendLiteral("quality=");
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outParams.AppendInt(NS_lround(quality * 100.0));
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}
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}
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}
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// If we haven't parsed the aParams check for proprietary options.
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// The proprietary option -moz-parse-options will take a image lib encoder
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// parse options string as is and pass it to the encoder.
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*outUsingCustomParseOptions = false;
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if (outParams.Length() == 0 && aEncoderOptions.isString()) {
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NS_NAMED_LITERAL_STRING(mozParseOptions, "-moz-parse-options:");
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nsAutoJSString paramString;
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if (!paramString.init(aCx, aEncoderOptions.toString())) {
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return NS_ERROR_FAILURE;
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}
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if (StringBeginsWith(paramString, mozParseOptions)) {
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nsDependentSubstring parseOptions =
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Substring(paramString, mozParseOptions.Length(),
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paramString.Length() - mozParseOptions.Length());
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outParams.Append(parseOptions);
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*outUsingCustomParseOptions = true;
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}
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}
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return NS_OK;
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}
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} // namespace dom
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} // namespace mozilla
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