gecko-dev/widget/nsDeviceContextSpecProxy.cpp

179 строки
5.0 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "nsDeviceContextSpecProxy.h"
#include "gfxASurface.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/DrawEventRecorder.h"
#include "mozilla/layout/RemotePrintJobChild.h"
#include "mozilla/RefPtr.h"
#include "mozilla/unused.h"
#include "nsComponentManagerUtils.h"
#include "nsIPrintSession.h"
#include "nsIPrintSettings.h"
using mozilla::Unused;
NS_IMPL_ISUPPORTS(nsDeviceContextSpecProxy, nsIDeviceContextSpec)
NS_IMETHODIMP
nsDeviceContextSpecProxy::Init(nsIWidget* aWidget,
nsIPrintSettings* aPrintSettings,
bool aIsPrintPreview)
{
nsresult rv;
mRealDeviceContextSpec =
do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1", &rv);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mRealDeviceContextSpec->Init(nullptr, aPrintSettings, false);
if (NS_WARN_IF(NS_FAILED(rv))) {
mRealDeviceContextSpec = nullptr;
return rv;
}
mPrintSettings = aPrintSettings;
if (aIsPrintPreview) {
return NS_OK;
}
// nsIPrintSettings only has a weak reference to nsIPrintSession, so we hold
// it to make sure it's available for the lifetime of the print.
rv = mPrintSettings->GetPrintSession(getter_AddRefs(mPrintSession));
if (NS_FAILED(rv) || !mPrintSession) {
NS_WARNING("We can't print via the parent without an nsIPrintSession.");
return rv;
}
rv = mPrintSession->GetRemotePrintJob(getter_AddRefs(mRemotePrintJob));
if (NS_FAILED(rv) || !mRemotePrintJob) {
NS_WARNING("We can't print via the parent without a RemotePrintJobChild.");
return rv;
}
return NS_OK;
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::GetSurfaceForPrinter(gfxASurface** aSurface)
{
MOZ_ASSERT(aSurface);
MOZ_ASSERT(mRealDeviceContextSpec);
// The real device context may need to have created a real printing surface
// even though we're not using it directly.
nsresult rv = mRealDeviceContextSpec->GetSurfaceForPrinter(aSurface);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
double width, height;
rv = mPrintSettings->GetEffectivePageSize(&width, &height);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// convert twips to points
width /= TWIPS_PER_POINT_FLOAT;
height /= TWIPS_PER_POINT_FLOAT;
RefPtr<gfxASurface> surface = gfxPlatform::GetPlatform()->
CreateOffscreenSurface(mozilla::gfx::IntSize(width, height),
gfxImageFormat::ARGB32);
surface.forget(aSurface);
return NS_OK;
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::GetDrawEventRecorder(mozilla::gfx::DrawEventRecorder** aDrawEventRecorder)
{
MOZ_ASSERT(aDrawEventRecorder);
RefPtr<mozilla::gfx::DrawEventRecorder> result = mRecorder;
result.forget(aDrawEventRecorder);
return NS_OK;
}
float
nsDeviceContextSpecProxy::GetDPI()
{
MOZ_ASSERT(mRealDeviceContextSpec);
return mRealDeviceContextSpec->GetDPI();
}
float
nsDeviceContextSpecProxy::GetPrintingScale()
{
MOZ_ASSERT(mRealDeviceContextSpec);
return mRealDeviceContextSpec->GetPrintingScale();
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::BeginDocument(const nsAString& aTitle,
const nsAString& aPrintToFileName,
int32_t aStartPage, int32_t aEndPage)
{
mRecorder = new DrawEventRecorderMemory();
return mRemotePrintJob->InitializePrint(nsString(aTitle),
nsString(aPrintToFileName),
aStartPage, aEndPage);
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::EndDocument()
{
Unused << mRemotePrintJob->SendFinalizePrint();
return NS_OK;
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::AbortDocument()
{
Unused << mRemotePrintJob->SendAbortPrint(NS_OK);
return NS_OK;
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::BeginPage()
{
return NS_OK;
}
NS_IMETHODIMP
nsDeviceContextSpecProxy::EndPage()
{
// Save the current page recording to shared memory.
mozilla::ipc::Shmem storedPage;
size_t recordingSize = mRecorder->RecordingSize();
if (!mRemotePrintJob->AllocShmem(recordingSize,
mozilla::ipc::SharedMemory::TYPE_BASIC,
&storedPage)) {
NS_WARNING("Failed to create shared memory for remote printing.");
return NS_ERROR_FAILURE;
}
bool success = mRecorder->CopyRecording(storedPage.get<char>(), recordingSize);
if (!success) {
NS_WARNING("Copying recording to shared memory was not succesful.");
return NS_ERROR_FAILURE;
}
// Wipe the recording to free memory. The recorder does not forget which data
// backed objects that it has stored.
mRecorder->WipeRecording();
// Send the page recording to the parent.
mRemotePrintJob->ProcessPage(storedPage);
return NS_OK;
}