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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ImageFactory.h"
#include <algorithm>
#include "mozilla/Likely.h"
#include "nsIChannel.h"
#include "nsIFileChannel.h"
#include "nsIObserverService.h"
#include "nsIFile.h"
#include "nsMimeTypes.h"
#include "nsIRequest.h"
#include "MultipartImage.h"
#include "RasterImage.h"
#include "VectorImage.h"
#include "Image.h"
#include "nsMediaFragmentURIParser.h"
#include "nsContentUtils.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/ProfilerMarkers.h"
namespace mozilla {
namespace image {
/*static*/
void ImageFactory::Initialize() {}
static uint32_t ComputeImageFlags(nsIURI* uri, const nsCString& aMimeType,
bool isMultiPart) {
// We default to the static globals.
bool isDiscardable = StaticPrefs::image_mem_discardable();
bool doDecodeImmediately = StaticPrefs::image_decode_immediately_enabled();
// We want UI to be as snappy as possible and not to flicker. Disable
// discarding for chrome URLS.
if (uri->SchemeIs("chrome")) {
isDiscardable = false;
}
// We don't want resources like the "loading" icon to be discardable either.
if (uri->SchemeIs("resource")) {
isDiscardable = false;
}
// For multipart/x-mixed-replace, we basically want a direct channel to the
// decoder. Disable everything for this case.
if (isMultiPart) {
isDiscardable = false;
}
// We have all the information we need.
uint32_t imageFlags = Image::INIT_FLAG_NONE;
if (isDiscardable) {
imageFlags |= Image::INIT_FLAG_DISCARDABLE;
}
if (doDecodeImmediately) {
imageFlags |= Image::INIT_FLAG_DECODE_IMMEDIATELY;
}
if (isMultiPart) {
imageFlags |= Image::INIT_FLAG_TRANSIENT;
}
// Synchronously decode metadata (including size) if we have a data URI since
// the data is immediately available.
if (uri->SchemeIs("data")) {
imageFlags |= Image::INIT_FLAG_SYNC_LOAD;
}
return imageFlags;
}
#ifdef DEBUG
static void NotifyImageLoading(nsIURI* aURI) {
if (!NS_IsMainThread()) {
nsCOMPtr<nsIURI> uri(aURI);
nsCOMPtr<nsIRunnable> ev = NS_NewRunnableFunction(
"NotifyImageLoading", [uri]() -> void { NotifyImageLoading(uri); });
SchedulerGroup::Dispatch(TaskCategory::Other, ev.forget());
return;
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
NS_WARNING_ASSERTION(obs, "Can't get an observer service handle");
if (obs) {
nsAutoCString spec;
aURI->GetSpec(spec);
obs->NotifyObservers(nullptr, "image-loading",
NS_ConvertUTF8toUTF16(spec).get());
}
}
#endif
/* static */
already_AddRefed<Image> ImageFactory::CreateImage(
nsIRequest* aRequest, ProgressTracker* aProgressTracker,
const nsCString& aMimeType, nsIURI* aURI, bool aIsMultiPart,
uint32_t aInnerWindowId) {
// Compute the image's initialization flags.
uint32_t imageFlags = ComputeImageFlags(aURI, aMimeType, aIsMultiPart);
#ifdef DEBUG
// Record the image load for startup performance testing.
if (aURI->SchemeIs("resource") || aURI->SchemeIs("chrome")) {
NotifyImageLoading(aURI);
}
#endif
if (profiler_thread_is_being_profiled_for_markers()) {
static const size_t sMaxTruncatedLength = 1024;
nsAutoCString spec;
aURI->GetSpec(spec);
if (spec.Length() >= sMaxTruncatedLength) {
spec.Truncate(sMaxTruncatedLength);
}
PROFILER_MARKER_TEXT("Image Load", GRAPHICS,
MarkerInnerWindowId(aInnerWindowId), spec);
}
// Select the type of image to create based on MIME type.
if (aMimeType.EqualsLiteral(IMAGE_SVG_XML)) {
return CreateVectorImage(aRequest, aProgressTracker, aMimeType, aURI,
imageFlags, aInnerWindowId);
} else {
return CreateRasterImage(aRequest, aProgressTracker, aMimeType, aURI,
imageFlags, aInnerWindowId);
}
}
// Marks an image as having an error before returning it.
template <typename T>
static already_AddRefed<Image> BadImage(const char* aMessage,
RefPtr<T>& aImage) {
aImage->SetHasError();
return aImage.forget();
}
/* static */
already_AddRefed<Image> ImageFactory::CreateAnonymousImage(
const nsCString& aMimeType, uint32_t aSizeHint /* = 0 */) {
nsresult rv;
RefPtr<RasterImage> newImage = new RasterImage();
RefPtr<ProgressTracker> newTracker = new ProgressTracker();
newTracker->SetImage(newImage);
newImage->SetProgressTracker(newTracker);
rv = newImage->Init(aMimeType.get(), Image::INIT_FLAG_SYNC_LOAD);
if (NS_FAILED(rv)) {
return BadImage("RasterImage::Init failed", newImage);
}
rv = newImage->SetSourceSizeHint(aSizeHint);
if (NS_FAILED(rv)) {
return BadImage("RasterImage::SetSourceSizeHint failed", newImage);
}
return newImage.forget();
}
/* static */
already_AddRefed<MultipartImage> ImageFactory::CreateMultipartImage(
Image* aFirstPart, ProgressTracker* aProgressTracker) {
MOZ_ASSERT(aFirstPart);
MOZ_ASSERT(aProgressTracker);
RefPtr<MultipartImage> newImage = new MultipartImage(aFirstPart);
aProgressTracker->SetImage(newImage);
newImage->SetProgressTracker(aProgressTracker);
newImage->Init();
return newImage.forget();
}
int32_t SaturateToInt32(int64_t val) {
if (val > INT_MAX) {
return INT_MAX;
}
if (val < INT_MIN) {
return INT_MIN;
}
return static_cast<int32_t>(val);
}
uint32_t GetContentSize(nsIRequest* aRequest) {
nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
if (channel) {
int64_t size;
nsresult rv = channel->GetContentLength(&size);
if (NS_SUCCEEDED(rv)) {
return std::max(SaturateToInt32(size), 0);
}
}
// Use the file size as a size hint for file channels.
nsCOMPtr<nsIFileChannel> fileChannel(do_QueryInterface(aRequest));
if (fileChannel) {
nsCOMPtr<nsIFile> file;
nsresult rv = fileChannel->GetFile(getter_AddRefs(file));
if (NS_SUCCEEDED(rv)) {
int64_t filesize;
rv = file->GetFileSize(&filesize);
if (NS_SUCCEEDED(rv)) {
return std::max(SaturateToInt32(filesize), 0);
}
}
}
// Fallback - neither http nor file. We'll use dynamic allocation.
return 0;
}
/* static */
already_AddRefed<Image> ImageFactory::CreateRasterImage(
nsIRequest* aRequest, ProgressTracker* aProgressTracker,
const nsCString& aMimeType, nsIURI* aURI, uint32_t aImageFlags,
uint32_t aInnerWindowId) {
MOZ_ASSERT(aProgressTracker);
nsresult rv;
RefPtr<RasterImage> newImage = new RasterImage(aURI);
aProgressTracker->SetImage(newImage);
newImage->SetProgressTracker(aProgressTracker);
rv = newImage->Init(aMimeType.get(), aImageFlags);
if (NS_FAILED(rv)) {
return BadImage("RasterImage::Init failed", newImage);
}
newImage->SetInnerWindowID(aInnerWindowId);
rv = newImage->SetSourceSizeHint(GetContentSize(aRequest));
if (NS_FAILED(rv)) {
return BadImage("RasterImage::SetSourceSizeHint failed", newImage);
}
return newImage.forget();
}
/* static */
already_AddRefed<Image> ImageFactory::CreateVectorImage(
nsIRequest* aRequest, ProgressTracker* aProgressTracker,
const nsCString& aMimeType, nsIURI* aURI, uint32_t aImageFlags,
uint32_t aInnerWindowId) {
MOZ_ASSERT(aProgressTracker);
nsresult rv;
RefPtr<VectorImage> newImage = new VectorImage(aURI);
aProgressTracker->SetImage(newImage);
newImage->SetProgressTracker(aProgressTracker);
rv = newImage->Init(aMimeType.get(), aImageFlags);
if (NS_FAILED(rv)) {
return BadImage("VectorImage::Init failed", newImage);
}
newImage->SetInnerWindowID(aInnerWindowId);
rv = newImage->OnStartRequest(aRequest);
if (NS_FAILED(rv)) {
return BadImage("VectorImage::OnStartRequest failed", newImage);
}
return newImage.forget();
}
} // namespace image
} // namespace mozilla