gecko-dev/image/ImageFactory.cpp
Seth Fowler 947de7376b Bug 1187386 (Part 2) - Rework decoder code to avoid calling Decode::GetImage(). r=tn
--HG--
extra : rebase_source : 6fc835a3468e846cb59474efcfea5355914a9dc4
2015-07-31 07:29:03 -07:00

303 lines
8.7 KiB
C++

/* -*- 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 <algorithm>
#include "mozilla/Likely.h"
#include "nsIHttpChannel.h"
#include "nsIFileChannel.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 "nsIScriptSecurityManager.h"
#include "ImageFactory.h"
#include "gfxPrefs.h"
namespace mozilla {
namespace image {
/*static*/ void
ImageFactory::Initialize()
{ }
static bool
ShouldDownscaleDuringDecode(const nsCString& aMimeType)
{
return aMimeType.EqualsLiteral(IMAGE_JPEG) ||
aMimeType.EqualsLiteral(IMAGE_JPG) ||
aMimeType.EqualsLiteral(IMAGE_PJPEG);
}
static uint32_t
ComputeImageFlags(ImageURL* uri, const nsCString& aMimeType, bool isMultiPart)
{
nsresult rv;
// We default to the static globals.
bool isDiscardable = gfxPrefs::ImageMemDiscardable();
bool doDecodeImmediately = gfxPrefs::ImageDecodeImmediatelyEnabled();
bool doDownscaleDuringDecode = gfxPrefs::ImageDownscaleDuringDecodeEnabled();
// We want UI to be as snappy as possible and not to flicker. Disable
// discarding for chrome URLS.
bool isChrome = false;
rv = uri->SchemeIs("chrome", &isChrome);
if (NS_SUCCEEDED(rv) && isChrome) {
isDiscardable = false;
}
// We don't want resources like the "loading" icon to be discardable either.
bool isResource = false;
rv = uri->SchemeIs("resource", &isResource);
if (NS_SUCCEEDED(rv) && isResource) {
isDiscardable = false;
}
// Downscale-during-decode is only enabled for certain content types.
if (doDownscaleDuringDecode && !ShouldDownscaleDuringDecode(aMimeType)) {
doDownscaleDuringDecode = false;
}
// For multipart/x-mixed-replace, we basically want a direct channel to the
// decoder. Disable everything for this case.
if (isMultiPart) {
isDiscardable = doDownscaleDuringDecode = 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;
}
if (doDownscaleDuringDecode) {
imageFlags |= Image::INIT_FLAG_DOWNSCALE_DURING_DECODE;
}
return imageFlags;
}
/* static */ already_AddRefed<Image>
ImageFactory::CreateImage(nsIRequest* aRequest,
ProgressTracker* aProgressTracker,
const nsCString& aMimeType,
ImageURL* aURI,
bool aIsMultiPart,
uint32_t aInnerWindowId)
{
MOZ_ASSERT(gfxPrefs::SingletonExists(),
"Pref observers should have been initialized already");
// Compute the image's initialization flags.
uint32_t imageFlags = ComputeImageFlags(aURI, aMimeType, aIsMultiPart);
// 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. Used with macros like
// NS_ENSURE_SUCCESS, since we guarantee to always return an image even if an
// error occurs, but callers need to be able to tell that this happened.
template <typename T>
static already_AddRefed<Image>
BadImage(nsRefPtr<T>& image)
{
image->SetHasError();
return image.forget();
}
/* static */ already_AddRefed<Image>
ImageFactory::CreateAnonymousImage(const nsCString& aMimeType)
{
nsresult rv;
nsRefPtr<RasterImage> newImage = new RasterImage();
nsRefPtr<ProgressTracker> newTracker = new ProgressTracker();
newTracker->SetImage(newImage);
newImage->SetProgressTracker(newTracker);
rv = newImage->Init(aMimeType.get(), Image::INIT_FLAG_SYNC_LOAD);
NS_ENSURE_SUCCESS(rv, BadImage(newImage));
return newImage.forget();
}
/* static */ already_AddRefed<MultipartImage>
ImageFactory::CreateMultipartImage(Image* aFirstPart,
ProgressTracker* aProgressTracker)
{
MOZ_ASSERT(aFirstPart);
MOZ_ASSERT(aProgressTracker);
nsRefPtr<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,
ImageURL* aURI,
uint32_t aImageFlags,
uint32_t aInnerWindowId)
{
MOZ_ASSERT(aProgressTracker);
nsresult rv;
nsRefPtr<RasterImage> newImage = new RasterImage(aURI);
aProgressTracker->SetImage(newImage);
newImage->SetProgressTracker(aProgressTracker);
nsAutoCString ref;
aURI->GetRef(ref);
net::nsMediaFragmentURIParser parser(ref);
if (parser.HasResolution()) {
newImage->SetRequestedResolution(parser.GetResolution());
}
if (parser.HasSampleSize()) {
/* Get our principal */
nsCOMPtr<nsIChannel> chan(do_QueryInterface(aRequest));
nsCOMPtr<nsIPrincipal> principal;
if (chan) {
nsContentUtils::GetSecurityManager()
->GetChannelResultPrincipal(chan, getter_AddRefs(principal));
}
if ((principal &&
principal->GetAppStatus() == nsIPrincipal::APP_STATUS_CERTIFIED) ||
gfxPrefs::ImageMozSampleSizeEnabled()) {
newImage->SetRequestedSampleSize(parser.GetSampleSize());
}
}
rv = newImage->Init(aMimeType.get(), aImageFlags);
NS_ENSURE_SUCCESS(rv, BadImage(newImage));
newImage->SetInnerWindowID(aInnerWindowId);
uint32_t len = GetContentSize(aRequest);
// Pass anything usable on so that the RasterImage can preallocate
// its source buffer.
if (len > 0) {
// Bound by something reasonable
uint32_t sizeHint = std::min<uint32_t>(len, 20000000);
rv = newImage->SetSourceSizeHint(sizeHint);
if (NS_FAILED(rv)) {
// Flush memory, try to get some back, and try again.
rv = nsMemory::HeapMinimize(true);
nsresult rv2 = newImage->SetSourceSizeHint(sizeHint);
// If we've still failed at this point, things are going downhill.
if (NS_FAILED(rv) || NS_FAILED(rv2)) {
NS_WARNING("About to hit OOM in imagelib!");
}
}
}
return newImage.forget();
}
/* static */ already_AddRefed<Image>
ImageFactory::CreateVectorImage(nsIRequest* aRequest,
ProgressTracker* aProgressTracker,
const nsCString& aMimeType,
ImageURL* aURI,
uint32_t aImageFlags,
uint32_t aInnerWindowId)
{
MOZ_ASSERT(aProgressTracker);
nsresult rv;
nsRefPtr<VectorImage> newImage = new VectorImage(aURI);
aProgressTracker->SetImage(newImage);
newImage->SetProgressTracker(aProgressTracker);
rv = newImage->Init(aMimeType.get(), aImageFlags);
NS_ENSURE_SUCCESS(rv, BadImage(newImage));
newImage->SetInnerWindowID(aInnerWindowId);
rv = newImage->OnStartRequest(aRequest, nullptr);
NS_ENSURE_SUCCESS(rv, BadImage(newImage));
return newImage.forget();
}
} // namespace image
} // namespace mozilla