widget/nsDeviceContextSpecProxy.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsDeviceContextSpecProxy.h"
   8
   9 #include "gfxASurface.h"
  10 #include "gfxPlatform.h"
  11 #include "mozilla/gfx/DrawEventRecorder.h"
  12 #include "mozilla/gfx/PrintTargetThebes.h"
  13 #include "mozilla/layout/RemotePrintJobChild.h"
  14 #include "mozilla/RefPtr.h"
  15 #include "mozilla/Unused.h"
  16 #include "nsComponentManagerUtils.h"
  17 #include "nsAppDirectoryServiceDefs.h"
  18 #include "nsDirectoryServiceUtils.h"
  19 #include "nsIPrintSettings.h"
  20 #include "private/pprio.h"
  21
  22 using mozilla::Unused;
  23
  24 using namespace mozilla;
  25 using namespace mozilla::gfx;
  26
  27 NS_IMPL_ISUPPORTS(nsDeviceContextSpecProxy, nsIDeviceContextSpec)
  28
  29 nsDeviceContextSpecProxy::nsDeviceContextSpecProxy(
  30     RemotePrintJobChild* aRemotePrintJob)
  31     : mRemotePrintJob(aRemotePrintJob) {}
  32 nsDeviceContextSpecProxy::~nsDeviceContextSpecProxy() = default;
  33
  34 NS_IMETHODIMP
  35 nsDeviceContextSpecProxy::Init(nsIPrintSettings* aPrintSettings,
  36                                bool aIsPrintPreview) {
  37   mPrintSettings = aPrintSettings;
  38
  39   if (aIsPrintPreview) {
  40     return NS_OK;
  41   }
  42
  43   if (!mRemotePrintJob) {
  44     NS_WARNING("We can't print via the parent without a RemotePrintJobChild.");
  45     return NS_ERROR_FAILURE;
  46   }
  47
  48   return NS_OK;
  49 }
  50
  51 already_AddRefed<PrintTarget> nsDeviceContextSpecProxy::MakePrintTarget() {
  52   double width, height;
  53   mPrintSettings->GetEffectiveSheetSize(&width, &height);
  54   if (width <= 0 || height <= 0) {
  55     return nullptr;
  56   }
  57
  58   // convert twips to points
  59   width /= TWIPS_PER_POINT_FLOAT;
  60   height /= TWIPS_PER_POINT_FLOAT;
  61
  62   RefPtr<gfxASurface> surface =
  63       gfxPlatform::GetPlatform()->CreateOffscreenSurface(
  64           mozilla::gfx::IntSize::Ceil(width, height),
  65           mozilla::gfx::SurfaceFormat::A8R8G8B8_UINT32);
  66   if (!surface) {
  67     return nullptr;
  68   }
  69
  70   // The type of PrintTarget that we return here shouldn't really matter since
  71   // our implementation of GetDrawEventRecorder returns an object, which means
  72   // the DrawTarget returned by the PrintTarget will be a
  73   // DrawTargetWrapAndRecord. The recording will be serialized and sent over to
  74   // the parent process where PrintTranslator::TranslateRecording will call
  75   // MakePrintTarget (indirectly via PrintTranslator::CreateDrawTarget) on
  76   // whatever type of nsIDeviceContextSpecProxy is created for the platform that
  77   // we are running on.  It is that DrawTarget that the recording will be
  78   // replayed on to print.
  79   // XXX(jwatt): The above isn't quite true.  We do want to use a
  80   // PrintTargetRecording here, but we can't until bug 1280324 is figured out
  81   // and fixed otherwise we will cause bug 1280181 to happen again.
  82   RefPtr<PrintTarget> target = PrintTargetThebes::CreateOrNull(surface);
  83
  84   return target.forget();
  85 }
  86
  87 NS_IMETHODIMP
  88 nsDeviceContextSpecProxy::GetDrawEventRecorder(
  89     mozilla::gfx::DrawEventRecorder** aDrawEventRecorder) {
  90   MOZ_ASSERT(aDrawEventRecorder);
  91   RefPtr<mozilla::gfx::DrawEventRecorder> result = mRecorder;
  92   result.forget(aDrawEventRecorder);
  93   return NS_OK;
  94 }
  95
  96 NS_IMETHODIMP
  97 nsDeviceContextSpecProxy::BeginDocument(const nsAString& aTitle,
  98                                         const nsAString& aPrintToFileName,
  99                                         int32_t aStartPage, int32_t aEndPage) {
 100   if (!mRemotePrintJob || mRemotePrintJob->IsDestroyed()) {
 101     mRemotePrintJob = nullptr;
 102     return NS_ERROR_NOT_AVAILABLE;
 103   }
 104
 105   mRecorder = new mozilla::layout::DrawEventRecorderPRFileDesc();
 106   nsresult rv =
 107       mRemotePrintJob->InitializePrint(nsString(aTitle), aStartPage, aEndPage);
 108   if (NS_FAILED(rv)) {
 109     // The parent process will send a 'delete' message to tell this process to
 110     // delete our RemotePrintJobChild.  As soon as we return to the event loop
 111     // and evaluate that message we will crash if we try to access
 112     // mRemotePrintJob.  We must not try to use it again.
 113     mRemotePrintJob = nullptr;
 114   }
 115   return rv;
 116 }
 117
 118 RefPtr<mozilla::gfx::PrintEndDocumentPromise>
 119 nsDeviceContextSpecProxy::EndDocument() {
 120   if (!mRemotePrintJob || mRemotePrintJob->IsDestroyed()) {
 121     mRemotePrintJob = nullptr;
 122     return mozilla::gfx::PrintEndDocumentPromise::CreateAndReject(
 123         NS_ERROR_NOT_AVAILABLE, __func__);
 124   }
 125
 126   Unused << mRemotePrintJob->SendFinalizePrint();
 127
 128   return mozilla::gfx::PrintEndDocumentPromise::CreateAndResolve(true,
 129                                                                  __func__);
 130 }
 131
 132 NS_IMETHODIMP
 133 nsDeviceContextSpecProxy::BeginPage(const IntSize& aSizeInPoints) {
 134   if (!mRemotePrintJob || mRemotePrintJob->IsDestroyed()) {
 135     mRemotePrintJob = nullptr;
 136     return NS_ERROR_NOT_AVAILABLE;
 137   }
 138
 139   mRecorder->OpenFD(mRemotePrintJob->GetNextPageFD());
 140   mCurrentPageSizeInPoints = aSizeInPoints;
 141
 142   return NS_OK;
 143 }
 144
 145 NS_IMETHODIMP
 146 nsDeviceContextSpecProxy::EndPage() {
 147   if (!mRemotePrintJob || mRemotePrintJob->IsDestroyed()) {
 148     mRemotePrintJob = nullptr;
 149     return NS_ERROR_NOT_AVAILABLE;
 150   }
 151
 152   // Send the page recording to the parent.
 153   mRecorder->Close();
 154   mRemotePrintJob->ProcessPage(mCurrentPageSizeInPoints,
 155                                std::move(mRecorder->TakeDependentSurfaces()));
 156
 157   return NS_OK;
 158 }