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gecko-dev/layout/generic/nsPageSequenceFrame.cpp

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/* -*- 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 "nsPageSequenceFrame.h"
#include "mozilla/Logging.h"
#include "mozilla/PresShell.h"
#include "mozilla/PrintedSheetFrame.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/StaticPresData.h"
#include "DateTimeFormat.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsPresContext.h"
#include "gfxContext.h"
#include "nsGkAtoms.h"
#include "nsIFrame.h"
#include "nsIFrameInlines.h"
#include "nsIPrintSettings.h"
#include "nsPageFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsRegion.h"
#include "nsCSSFrameConstructor.h"
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "nsHTMLCanvasFrame.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsServiceManagerUtils.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::dom;
mozilla::LazyLogModule gLayoutPrintingLog("printing-layout");
#define PR_PL(_p1) MOZ_LOG(gLayoutPrintingLog, mozilla::LogLevel::Debug, _p1)
nsPageSequenceFrame* NS_NewPageSequenceFrame(PresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell)
nsPageSequenceFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsPageSequenceFrame)
nsPageSequenceFrame::nsPageSequenceFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsContainerFrame(aStyle, aPresContext, kClassID),
mMaxSheetSize(mWritingMode),
mScrollportSize(mWritingMode),
mCalledBeginPage(false),
mCurrentCanvasListSetup(false) {
mPageData = MakeUnique<nsSharedPageData>();
mPageData->mHeadFootFont =
*PresContext()
->Document()
->GetFontPrefsForLang(aStyle->StyleFont()->mLanguage)
->GetDefaultFont(StyleGenericFontFamily::Serif);
mPageData->mHeadFootFont.size =
Length::FromPixels(CSSPixel::FromPoints(10.0f));
mPageData->mPrintSettings = aPresContext->GetPrintSettings();
MOZ_RELEASE_ASSERT(mPageData->mPrintSettings, "How?");
// Doing this here so we only have to go get these formats once
SetPageNumberFormat("pagenumber", "%1$d", true);
SetPageNumberFormat("pageofpages", "%1$d of %2$d", false);
}
nsPageSequenceFrame::~nsPageSequenceFrame() { ResetPrintCanvasList(); }
NS_QUERYFRAME_HEAD(nsPageSequenceFrame)
NS_QUERYFRAME_ENTRY(nsPageSequenceFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
//----------------------------------------------------------------------
float nsPageSequenceFrame::GetPrintPreviewScale() const {
nsPresContext* pc = PresContext();
float scale = pc->GetPrintPreviewScaleForSequenceFrame();
WritingMode wm = GetWritingMode();
if (pc->IsScreen() && MOZ_LIKELY(mScrollportSize.ISize(wm) > 0 &&
mScrollportSize.BSize(wm) > 0)) {
// For print preview, scale down as-needed to ensure that each of our
// sheets will fit in the the scrollport.
// Check if the current scale is sufficient for our sheets to fit in inline
// axis (and if not, reduce the scale so that it will fit).
nscoord scaledISize = NSToCoordCeil(mMaxSheetSize.ISize(wm) * scale);
if (scaledISize > mScrollportSize.ISize(wm)) {
scale *= float(mScrollportSize.ISize(wm)) / float(scaledISize);
}
// Further reduce the scale (if needed) to be sure each sheet will fit in
// block axis, too.
// NOTE: in general, a scrollport's BSize *could* be unconstrained,
// i.e. sized to its contents. If that happens, then shrinking the contents
// to fit the scrollport is not a meaningful operation in this axis, so we
// skip over this. But we can be pretty sure that the print-preview UI
// will have given the scrollport a fixed size; hence the MOZ_LIKELY here.
if (MOZ_LIKELY(mScrollportSize.BSize(wm) != NS_UNCONSTRAINEDSIZE)) {
nscoord scaledBSize = NSToCoordCeil(mMaxSheetSize.BSize(wm) * scale);
if (scaledBSize > mScrollportSize.BSize(wm)) {
scale *= float(mScrollportSize.BSize(wm)) / float(scaledBSize);
}
}
}
return scale;
}
void nsPageSequenceFrame::PopulateReflowOutput(
ReflowOutput& aReflowOutput, const ReflowInput& aReflowInput) {
// Aim to fill the whole available space, not only so we can act as a
// background in print preview but also handle overflow in child page frames
// correctly.
// Use availableISize so we don't cause a needless horizontal scrollbar.
float scale = GetPrintPreviewScale();
WritingMode wm = aReflowInput.GetWritingMode();
nscoord iSize = wm.IsVertical() ? mSize.Height() : mSize.Width();
nscoord bSize = wm.IsVertical() ? mSize.Width() : mSize.Height();
aReflowOutput.ISize(wm) =
std::max(NSToCoordFloor(iSize * scale), aReflowInput.AvailableISize());
aReflowOutput.BSize(wm) =
std::max(NSToCoordFloor(bSize * scale), aReflowInput.ComputedBSize());
aReflowOutput.SetOverflowAreasToDesiredBounds();
}
// Helper function to compute the offset needed to center a child
// page-frame's margin-box inside our content-box.
nscoord nsPageSequenceFrame::ComputeCenteringMargin(
nscoord aContainerContentBoxWidth, nscoord aChildPaddingBoxWidth,
const nsMargin& aChildPhysicalMargin) {
// We'll be centering our child's margin-box, so get the size of that:
nscoord childMarginBoxWidth =
aChildPaddingBoxWidth + aChildPhysicalMargin.LeftRight();
// When rendered, our child's rect will actually be scaled up by the
// print-preview scale factor, via ComputePageSequenceTransform().
// We really want to center *that scaled-up rendering* inside of
// aContainerContentBoxWidth. So, we scale up its margin-box here...
float scale = GetPrintPreviewScale();
nscoord scaledChildMarginBoxWidth =
NSToCoordRound(childMarginBoxWidth * scale);
// ...and see we how much space is left over, when we subtract that scaled-up
// size from the container width:
nscoord scaledExtraSpace =
aContainerContentBoxWidth - scaledChildMarginBoxWidth;
if (scaledExtraSpace <= 0) {
// (Don't bother centering if there's zero/negative space.)
return 0;
}
// To center the child, we want to give it an additional left-margin of half
// of the extra space. And then, we have to scale that space back down, so
// that it'll produce the correct scaled-up amount when we render (because
// rendering will scale it back up):
return NSToCoordRound(scaledExtraSpace * 0.5 / scale);
}
/*
* Note: we largely position/size out our children (page frames) using
* \*physical\* x/y/width/height values, because the print preview UI is always
* arranged in the same orientation, regardless of writing mode.
*/
void nsPageSequenceFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aReflowOutput,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
MOZ_ASSERT(aPresContext->IsRootPaginatedDocument(),
"A Page Sequence is only for real pages");
DO_GLOBAL_REFLOW_COUNT("nsPageSequenceFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aReflowOutput, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_FRAME_TRACE_REFLOW_IN("nsPageSequenceFrame::Reflow");
auto CenterPages = [&] {
for (nsIFrame* child : mFrames) {
nsMargin pageCSSMargin = child->GetUsedMargin();
nscoord centeringMargin =
ComputeCenteringMargin(aReflowInput.ComputedWidth(),
child->GetRect().Width(), pageCSSMargin);
nscoord newX = pageCSSMargin.left + centeringMargin;
// Adjust the child's x-position:
child->MovePositionBy(nsPoint(newX - child->GetNormalPosition().x, 0));
}
};
if (aPresContext->IsScreen()) {
// When we're displayed on-screen, the computed size that we're given is
// the size of our scrollport. We need to save this for use in
// GetPrintPreviewScale.
mScrollportSize = aReflowInput.ComputedSize();
}
// Don't do incremental reflow until we've taught tables how to do
// it right in paginated mode.
if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
// Return our desired size
PopulateReflowOutput(aReflowOutput, aReflowInput);
FinishAndStoreOverflow(&aReflowOutput);
if (GetSize() != aReflowOutput.PhysicalSize()) {
CenterPages();
}
return;
}
nsIntMargin unwriteableTwips =
mPageData->mPrintSettings->GetUnwriteableMarginInTwips();
nsIntMargin edgeTwips = mPageData->mPrintSettings->GetEdgeInTwips();
// sanity check the values. three inches are sometimes needed
int32_t threeInches = NS_INCHES_TO_INT_TWIPS(3.0);
edgeTwips.EnsureAtMost(
nsIntMargin(threeInches, threeInches, threeInches, threeInches));
edgeTwips.EnsureAtLeast(unwriteableTwips);
mPageData->mEdgePaperMargin = nsPresContext::CSSTwipsToAppUnits(edgeTwips);
// Get the custom page-range state:
mPageData->mPrintSettings->GetStartPageRange(&mPageData->mFromPageNum);
mPageData->mPrintSettings->GetEndPageRange(&mPageData->mToPageNum);
mPageData->mPrintSettings->GetPageRanges(mPageData->mPageRanges);
int16_t printType;
mPageData->mPrintSettings->GetPrintRange(&printType);
mPageData->mDoingPageRange =
nsIPrintSettings::kRangeSpecifiedPageRange == printType;
// We use the CSS "margin" property on the -moz-printed-sheet pseudoelement
// to determine the space between each printed sheet in print preview.
// Keep a running y-offset for each printed sheet.
nscoord y = 0;
// These represent the maximum sheet size across all our sheets (in each
// axis), inflated a bit to account for the -moz-printed-sheet 'margin'.
nscoord maxInflatedSheetWidth = 0;
nscoord maxInflatedSheetHeight = 0;
// Tile the sheets vertically
for (nsIFrame* kidFrame : mFrames) {
// Set the shared data into the page frame before reflow
MOZ_ASSERT(kidFrame->IsPrintedSheetFrame(),
"we're only expecting PrintedSheetFrame as children");
auto* sheet = static_cast<PrintedSheetFrame*>(kidFrame);
sheet->SetSharedPageData(mPageData.get());
// Reflow the sheet
ReflowInput kidReflowInput(
aPresContext, aReflowInput, kidFrame,
LogicalSize(kidFrame->GetWritingMode(), aPresContext->GetPageSize()));
ReflowOutput kidReflowOutput(kidReflowInput);
nsReflowStatus status;
kidReflowInput.SetComputedISize(kidReflowInput.AvailableISize());
// kidReflowInput.SetComputedHeight(kidReflowInput.AvailableHeight());
PR_PL(("AV ISize: %d BSize: %d\n", kidReflowInput.AvailableISize(),
kidReflowInput.AvailableBSize()));
nsMargin pageCSSMargin = kidReflowInput.ComputedPhysicalMargin();
y += pageCSSMargin.top;
nscoord x = pageCSSMargin.left;
// Place and size the sheet.
ReflowChild(kidFrame, aPresContext, kidReflowOutput, kidReflowInput, x, y,
ReflowChildFlags::Default, status);
FinishReflowChild(kidFrame, aPresContext, kidReflowOutput, &kidReflowInput,
x, y, ReflowChildFlags::Default);
y += kidReflowOutput.Height();
y += pageCSSMargin.bottom;
maxInflatedSheetWidth =
std::max(maxInflatedSheetWidth,
kidReflowOutput.Width() + pageCSSMargin.LeftRight());
maxInflatedSheetHeight =
std::max(maxInflatedSheetHeight,
kidReflowOutput.Height() + pageCSSMargin.TopBottom());
// Is the sheet complete?
nsIFrame* kidNextInFlow = kidFrame->GetNextInFlow();
if (status.IsFullyComplete()) {
NS_ASSERTION(!kidNextInFlow, "bad child flow list");
} else if (!kidNextInFlow) {
// The sheet isn't complete and it doesn't have a next-in-flow, so
// create a continuing sheet.
nsIFrame* continuingSheet =
PresShell()->FrameConstructor()->CreateContinuingFrame(kidFrame,
this);
// Add it to our child list
mFrames.InsertFrame(nullptr, kidFrame, continuingSheet);
}
}
nsAutoString formattedDateString;
PRTime now = PR_Now();
if (NS_SUCCEEDED(DateTimeFormat::FormatPRTime(
kDateFormatShort, kTimeFormatNoSeconds, now, formattedDateString))) {
SetDateTimeStr(formattedDateString);
}
// cache the size so we can set the desired size for the other reflows that
// happen. Since we're tiling our sheets vertically: in the x axis, we are
// as wide as our widest sheet (inflated via "margin"); and in the y axis,
// we're as tall as the sum of our sheets' inflated heights, which the 'y'
// variable is conveniently storing at this point.
mSize = nsSize(maxInflatedSheetWidth, y);
if (aPresContext->IsScreen()) {
// Also cache the maximum size of all our sheets, to use together with the
// scrollport size (available as our computed size, and captured higher up
// in this function), so that we can scale to ensure that every sheet will
// fit in the scrollport.
WritingMode wm = aReflowInput.GetWritingMode();
mMaxSheetSize =
LogicalSize(wm, nsSize(maxInflatedSheetWidth, maxInflatedSheetHeight));
}
// Return our desired size
// Adjust the reflow size by PrintPreviewScale so the scrollbars end up the
// correct size
PopulateReflowOutput(aReflowOutput, aReflowInput);
FinishAndStoreOverflow(&aReflowOutput);
// Now center our pages.
CenterPages();
NS_FRAME_TRACE_REFLOW_OUT("nsPageSequenceFrame::Reflow", aStatus);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aReflowOutput);
}
//----------------------------------------------------------------------
#ifdef DEBUG_FRAME_DUMP
nsresult nsPageSequenceFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"PageSequence"_ns, aResult);
}
#endif
//====================================================================
//== Asynch Printing
//====================================================================
void nsPageSequenceFrame::GetPrintRange(int32_t* aFromPage,
int32_t* aToPage) const {
*aFromPage = mPageData->mFromPageNum;
*aToPage = mPageData->mToPageNum;
}
// Helper Function
void nsPageSequenceFrame::SetPageNumberFormat(const char* aPropName,
const char* aDefPropVal,
bool aPageNumOnly) {
// Doing this here so we only have to go get these formats once
nsAutoString pageNumberFormat;
// Now go get the Localized Page Formating String
nsresult rv = nsContentUtils::GetLocalizedString(
nsContentUtils::ePRINTING_PROPERTIES, aPropName, pageNumberFormat);
if (NS_FAILED(rv)) { // back stop formatting
pageNumberFormat.AssignASCII(aDefPropVal);
}
SetPageNumberFormat(pageNumberFormat, aPageNumOnly);
}
nsresult nsPageSequenceFrame::StartPrint(nsPresContext* aPresContext,
nsIPrintSettings* aPrintSettings,
const nsAString& aDocTitle,
const nsAString& aDocURL) {
NS_ENSURE_ARG_POINTER(aPresContext);
NS_ENSURE_ARG_POINTER(aPrintSettings);
if (!mPageData->mPrintSettings) {
mPageData->mPrintSettings = aPrintSettings;
}
if (!aDocTitle.IsEmpty()) {
mPageData->mDocTitle = aDocTitle;
}
if (!aDocURL.IsEmpty()) {
mPageData->mDocURL = aDocURL;
}
// If printing a range of pages make sure at least the starting page
// number is valid
if (mPageData->mDoingPageRange) {
if (mPageData->mFromPageNum > mPageData->mRawNumPages) {
return NS_ERROR_INVALID_ARG;
}
}
// Begin printing of the document
mPageNum = 1;
return NS_OK;
}
static void GetPrintCanvasElementsInFrame(
nsIFrame* aFrame, nsTArray<RefPtr<HTMLCanvasElement> >* aArr) {
if (!aFrame) {
return;
}
for (const auto& childList : aFrame->ChildLists()) {
for (nsIFrame* child : childList.mList) {
// Check if child is a nsHTMLCanvasFrame.
nsHTMLCanvasFrame* canvasFrame = do_QueryFrame(child);
// If there is a canvasFrame, try to get actual canvas element.
if (canvasFrame) {
HTMLCanvasElement* canvas =
HTMLCanvasElement::FromNodeOrNull(canvasFrame->GetContent());
if (canvas && canvas->GetMozPrintCallback()) {
aArr->AppendElement(canvas);
continue;
}
}
if (!child->PrincipalChildList().FirstChild()) {
nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(child);
if (subdocumentFrame) {
// Descend into the subdocument
nsIFrame* root = subdocumentFrame->GetSubdocumentRootFrame();
child = root;
}
}
// The current child is not a nsHTMLCanvasFrame OR it is but there is
// no HTMLCanvasElement on it. Check if children of `child` might
// contain a HTMLCanvasElement.
GetPrintCanvasElementsInFrame(child, aArr);
}
}
}
// XXXdholbert The next four functions[1] exist to support functionality to let
// us include/skip various pages (e.g. only print even pages, or page 7, or the
// page-range "1,4,6-8"). These four functions are all named in terms of
// "page", which is somewhat problematic now that we've got a level of
// indirection between us and the actual page frames; but in practice, they're
// still valid & fine as long as there's exactly one nsPageFrame per
// PrintedSheetFrame (as there is right now).
//
// When we implement built-in support for N Pages Per Sheet (bug 1631452),
// we'll need this logic to cooperate with PrintedSheetFrame, so that a given
// PrintedSheetFrame instance can figure out which of the upcoming pages it
// should include/skip in its N tiny pages. We may need to change our calling
// pattern all the way up to nsPagePrintTimer, too (which currently has a
// repeating timer that fires to prompt us to print each successive page, with
// a variable delay between firings, depending on whether the last page was
// skipped.
//
// [1] DetermineWhetherToPrintPage(), GetCurrentPageFrame(),
// PrePrintNextPage(), and PrintNextPage()
void nsPageSequenceFrame::DetermineWhetherToPrintPage() {
// See whether we should print this page
mPrintThisPage = true;
bool printEvenPages, printOddPages;
mPageData->mPrintSettings->GetPrintOptions(nsIPrintSettings::kPrintEvenPages,
&printEvenPages);
mPageData->mPrintSettings->GetPrintOptions(nsIPrintSettings::kPrintOddPages,
&printOddPages);
// If printing a range of pages check whether the page number is in the
// range of pages to print
if (mPageData->mDoingPageRange) {
if (mPageNum < mPageData->mFromPageNum) {
mPrintThisPage = false;
} else if (mPageNum > mPageData->mToPageNum) {
mPageNum++;
mPrintThisPage = false;
return;
} else {
const auto& ranges = mPageData->mPageRanges;
int32_t length = ranges.Length();
// Page ranges are pairs (start, end)
if (length && (length % 2 == 0)) {
mPrintThisPage = false;
int32_t i;
for (i = 0; i < length; i += 2) {
if (ranges[i] <= mPageNum && mPageNum <= ranges[i + 1]) {
mPrintThisPage = true;
break;
}
}
}
}
}
// Check for printing of odd and even pages
if (mPageNum & 0x1) {
if (!printOddPages) {
mPrintThisPage = false; // don't print odd numbered page
}
} else {
if (!printEvenPages) {
mPrintThisPage = false; // don't print even numbered page
}
}
}
nsIFrame* nsPageSequenceFrame::GetCurrentPageFrame() {
int32_t i = 1;
for (nsIFrame* child : mFrames) {
if (i == mPageNum) {
return child;
}
++i;
}
return nullptr;
}
nsresult nsPageSequenceFrame::PrePrintNextPage(nsITimerCallback* aCallback,
bool* aDone) {
nsIFrame* currentPage = GetCurrentPageFrame();
if (!currentPage) {
*aDone = true;
return NS_ERROR_FAILURE;
}
DetermineWhetherToPrintPage();
// Nothing to do if the current page doesn't get printed OR rendering to
// preview. For preview, the `CallPrintCallback` is called from within the
// HTMLCanvasElement::HandlePrintCallback.
if (!mPrintThisPage || !PresContext()->IsRootPaginatedDocument()) {
*aDone = true;
return NS_OK;
}
// If the canvasList is null, then generate it and start the render
// process for all the canvas.
if (!mCurrentCanvasListSetup) {
mCurrentCanvasListSetup = true;
GetPrintCanvasElementsInFrame(currentPage, &mCurrentCanvasList);
if (!mCurrentCanvasList.IsEmpty()) {
nsresult rv = NS_OK;
// Begin printing of the document
nsDeviceContext* dc = PresContext()->DeviceContext();
PR_PL(("\n"));
PR_PL(("***************** BeginPage *****************\n"));
rv = dc->BeginPage();
NS_ENSURE_SUCCESS(rv, rv);
mCalledBeginPage = true;
RefPtr<gfxContext> renderingContext = dc->CreateRenderingContext();
NS_ENSURE_TRUE(renderingContext, NS_ERROR_OUT_OF_MEMORY);
DrawTarget* drawTarget = renderingContext->GetDrawTarget();
if (NS_WARN_IF(!drawTarget)) {
return NS_ERROR_FAILURE;
}
for (HTMLCanvasElement* canvas : Reversed(mCurrentCanvasList)) {
nsIntSize size = canvas->GetSize();
RefPtr<DrawTarget> canvasTarget =
drawTarget->CreateSimilarDrawTarget(size, drawTarget->GetFormat());
if (!canvasTarget) {
continue;
}
nsICanvasRenderingContextInternal* ctx = canvas->GetCurrentContext();
if (!ctx) {
continue;
}
// Initialize the context with the new DrawTarget.
ctx->InitializeWithDrawTarget(nullptr, WrapNotNull(canvasTarget));
// Start the rendering process.
// Note: Other than drawing to our CanvasRenderingContext2D, the
// callback cannot access or mutate our static clone document. It is
// evaluated in its original context (the window of the original
// document) of course, and our canvas has a strong ref to the
// original HTMLCanvasElement (in mOriginalCanvas) so that if the
// callback calls GetCanvas() on our CanvasRenderingContext2D (passed
// to it via a MozCanvasPrintState argument) it will be given the
// original 'canvas' element.
AutoWeakFrame weakFrame = this;
canvas->DispatchPrintCallback(aCallback);
NS_ENSURE_STATE(weakFrame.IsAlive());
}
}
}
uint32_t doneCounter = 0;
for (HTMLCanvasElement* canvas : mCurrentCanvasList) {
if (canvas->IsPrintCallbackDone()) {
doneCounter++;
}
}
// If all canvas have finished rendering, return true, otherwise false.
*aDone = doneCounter == mCurrentCanvasList.Length();
return NS_OK;
}
void nsPageSequenceFrame::ResetPrintCanvasList() {
for (int32_t i = mCurrentCanvasList.Length() - 1; i >= 0; i--) {
HTMLCanvasElement* canvas = mCurrentCanvasList[i];
canvas->ResetPrintCallback();
}
mCurrentCanvasList.Clear();
mCurrentCanvasListSetup = false;
}
nsresult nsPageSequenceFrame::PrintNextPage() {
// Note: When print al the pages or a page range the printed page shows the
// actual page number, when printing selection it prints the page number
// starting with the first page of the selection. For example if the user has
// a selection that starts on page 2 and ends on page 3, the page numbers when
// print are 1 and then two (which is different than printing a page range,
// where the page numbers would have been 2 and then 3)
nsIFrame* currentPageFrame = GetCurrentPageFrame();
if (!currentPageFrame) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
DetermineWhetherToPrintPage();
if (mPrintThisPage) {
nsDeviceContext* dc = PresContext()->DeviceContext();
if (PresContext()->IsRootPaginatedDocument()) {
if (!mCalledBeginPage) {
// We must make sure BeginPage() has been called since some printing
// backends can't give us a valid rendering context for a [physical]
// page otherwise.
PR_PL(("\n"));
PR_PL(("***************** BeginPage *****************\n"));
rv = dc->BeginPage();
NS_ENSURE_SUCCESS(rv, rv);
}
}
PR_PL(
("SeqFr::PrintNextPage -> %p PageNo: %d", currentPageFrame, mPageNum));
// CreateRenderingContext can fail
RefPtr<gfxContext> gCtx = dc->CreateRenderingContext();
NS_ENSURE_TRUE(gCtx, NS_ERROR_OUT_OF_MEMORY);
nsRect drawingRect(nsPoint(0, 0), currentPageFrame->GetSize());
nsRegion drawingRegion(drawingRect);
nsLayoutUtils::PaintFrame(gCtx, currentPageFrame, drawingRegion,
NS_RGBA(0, 0, 0, 0),
nsDisplayListBuilderMode::Painting,
nsLayoutUtils::PaintFrameFlags::SyncDecodeImages);
}
return rv;
}
nsresult nsPageSequenceFrame::DoPageEnd() {
nsresult rv = NS_OK;
if (PresContext()->IsRootPaginatedDocument() && mPrintThisPage) {
PR_PL(("***************** End Page (DoPageEnd) *****************\n"));
rv = PresContext()->DeviceContext()->EndPage();
NS_ENSURE_SUCCESS(rv, rv);
}
ResetPrintCanvasList();
mCalledBeginPage = false;
mPageNum++;
return rv;
}
gfx::Matrix4x4 ComputePageSequenceTransform(nsIFrame* aFrame,
float aAppUnitsPerPixel) {
MOZ_ASSERT(aFrame->IsPageSequenceFrame());
float scale =
static_cast<nsPageSequenceFrame*>(aFrame)->GetPrintPreviewScale();
return gfx::Matrix4x4::Scaling(scale, scale, 1);
}
void nsPageSequenceFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
aBuilder->SetInPageSequence(true);
aBuilder->SetDisablePartialUpdates(true);
DisplayBorderBackgroundOutline(aBuilder, aLists);
nsDisplayList content;
{
// Clear clip state while we construct the children of the
// nsDisplayTransform, since they'll be in a different coordinate system.
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
clipState.Clear();
nsIFrame* child = PrincipalChildList().FirstChild();
nsRect visible = aBuilder->GetVisibleRect();
visible.ScaleInverseRoundOut(GetPrintPreviewScale());
while (child) {
if (child->InkOverflowRectRelativeToParent().Intersects(visible)) {
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, child, visible - child->GetPosition(),
visible - child->GetPosition());
child->BuildDisplayListForStackingContext(aBuilder, &content);
aBuilder->ResetMarkedFramesForDisplayList(this);
}
child = child->GetNextSibling();
}
}
content.AppendNewToTop<nsDisplayTransform>(aBuilder, this, &content,
content.GetBuildingRect(),
::ComputePageSequenceTransform);
aLists.Content()->AppendToTop(&content);
aBuilder->SetInPageSequence(false);
}
//------------------------------------------------------------------------------
void nsPageSequenceFrame::SetPageNumberFormat(const nsAString& aFormatStr,
bool aForPageNumOnly) {
NS_ASSERTION(mPageData != nullptr, "mPageData string cannot be null!");
if (aForPageNumOnly) {
mPageData->mPageNumFormat = aFormatStr;
} else {
mPageData->mPageNumAndTotalsFormat = aFormatStr;
}
}
//------------------------------------------------------------------------------
void nsPageSequenceFrame::SetDateTimeStr(const nsAString& aDateTimeStr) {
NS_ASSERTION(mPageData != nullptr, "mPageData string cannot be null!");
mPageData->mDateTimeStr = aDateTimeStr;
}
void nsPageSequenceFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
MOZ_ASSERT(
mFrames.FirstChild() && mFrames.FirstChild()->IsPrintedSheetFrame(),
"nsPageSequenceFrame must have a PrintedSheetFrame child");
// Only append the first child; all our children are expected to be
// continuations of each other, and our anon box handling always walks
// continuations.
aResult.AppendElement(mFrames.FirstChild());
}
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