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fune/layout/generic/nsPageSequenceFrame.cpp
Jonathan Watt d4e8510ca6 Bug 1833244 p1. Create infrastructure to pass page dimensions to PrintTarget::BeginPage. r=dholbert 
OS print drivers/devices know nothing about page dimensions unless we tell
them. Previously, the physical page dimensions (including orientation) have
always been the same, so communicating their dimensions once at the start of
a print has been enough. In preparation for supporting different "physical"
page dimensions (in the immediate future only different page orientations) when
we save to PDF, we need to have the infrastructure to pass dimensions through
on a page-by-page basis. This patch adds that.

None of the PrintTarget subclasses do anything with this extra information yet,
but in a follow-up patch PrintTargetPDF will use this information to create
PDFs with mixed page orientations.

Depends on D179395

Differential Revision: https://phabricator.services.mozilla.com/D179423
2023-05-31 13:02:26 +00:00

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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/intl/AppDateTimeFormat.h"
#include "mozilla/Logging.h"
#include "mozilla/PresShell.h"
#include "mozilla/PrintedSheetFrame.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/StaticPresData.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>
#include <limits>
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)
static const nsPagesPerSheetInfo kSupportedPagesPerSheet[] = {
/* Members are: {mNumPages, mLargerNumTracks} */
// clang-format off
{1, 1},
{2, 2},
{4, 2},
{6, 3},
{9, 3},
{16, 4},
// clang-format on
};
inline void SanityCheckPagesPerSheetInfo() {
#ifdef DEBUG
// Sanity-checks:
MOZ_ASSERT(ArrayLength(kSupportedPagesPerSheet) > 0,
"Should have at least one pages-per-sheet option.");
MOZ_ASSERT(kSupportedPagesPerSheet[0].mNumPages == 1,
"The 0th index is reserved for default 1-page-per-sheet entry");
uint16_t prevInfoPPS = 0;
for (const auto& info : kSupportedPagesPerSheet) {
MOZ_ASSERT(info.mNumPages > prevInfoPPS,
"page count field should be positive & monotonically increase");
MOZ_ASSERT(info.mLargerNumTracks > 0,
"page grid has to have a positive number of tracks");
MOZ_ASSERT(info.mNumPages % info.mLargerNumTracks == 0,
"page count field should be evenly divisible by "
"the given track-count");
prevInfoPPS = info.mNumPages;
}
#endif
}
const nsPagesPerSheetInfo& nsPagesPerSheetInfo::LookupInfo(int32_t aPPS) {
SanityCheckPagesPerSheetInfo();
// Walk the array, looking for a match:
for (const auto& info : kSupportedPagesPerSheet) {
if (aPPS == info.mNumPages) {
return info;
}
}
NS_WARNING("Unsupported pages-per-sheet value");
// If no match was found, return the first entry (for 1 page per sheet).
return kSupportedPagesPerSheet[0];
}
const nsPagesPerSheetInfo* nsSharedPageData::PagesPerSheetInfo() {
if (mPagesPerSheetInfo) {
return mPagesPerSheetInfo;
}
int32_t pagesPerSheet;
if (!mPrintSettings ||
NS_FAILED(mPrintSettings->GetNumPagesPerSheet(&pagesPerSheet))) {
// If we can't read the value from print settings, just fall back to 1.
pagesPerSheet = 1;
}
mPagesPerSheetInfo = &nsPagesPerSheetInfo::LookupInfo(pagesPerSheet);
return mPagesPerSheetInfo;
}
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->GetPrintPreviewScaleForSequenceFrameOrScrollbars();
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();
nscoord availableISize = aReflowInput.AvailableISize();
nscoord computedBSize = aReflowInput.ComputedBSize();
if (MOZ_UNLIKELY(computedBSize == NS_UNCONSTRAINEDSIZE)) {
// We have unconstrained BSize, which should only happen if someone calls
// SizeToContent() on our window (which we don't expect to happen for
// actual user flows, but is possible for fuzzers to trigger). We just nerf
// the ReflowInput's contributions to the std::max() expressions below,
// which does indeed make us "size to content", via letting std::max()
// choose the scaled iSize/bSize expressions.
availableISize = computedBSize = 0;
}
aReflowOutput.ISize(wm) =
std::max(NSToCoordFloor(iSize * scale), availableISize);
aReflowOutput.BSize(wm) =
std::max(NSToCoordFloor(bSize * scale), 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);
}
uint32_t nsPageSequenceFrame::GetPagesInFirstSheet() const {
nsIFrame* firstSheet = mFrames.FirstChild();
if (!firstSheet) {
return 0;
}
MOZ_DIAGNOSTIC_ASSERT(firstSheet->IsPrintedSheetFrame());
return static_cast<PrintedSheetFrame*>(firstSheet)->GetNumPages();
}
/*
* 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.
// (NOTE: It's possible but unlikely that we have an unconstrained BSize
// here, if we're being sized to content. GetPrintPreviewScale() checks
// for and handles this, when making use of this member-var.)
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->GetPageRanges(mPageData->mPageRanges);
// 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());
// If we want to reliably access the nsPageFrame before reflowing the sheet
// frame, we need to call this:
sheet->ClaimPageFrameFromPrevInFlow();
const nsSize sheetSize = sheet->PrecomputeSheetSize(aPresContext);
// Reflow the sheet
ReflowInput kidReflowInput(
aPresContext, aReflowInput, kidFrame,
LogicalSize(kidFrame->GetWritingMode(), sheetSize));
kidReflowInput.mBreakType = ReflowInput::BreakType::Page;
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);
MOZ_ASSERT(kidFrame->GetSize() == sheetSize,
"PrintedSheetFrame::PrecomputeSheetSize gave the wrong size!");
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();
mozilla::intl::DateTimeFormat::StyleBag style;
style.date = Some(mozilla::intl::DateTimeFormat::Style::Short);
style.time = Some(mozilla::intl::DateTimeFormat::Style::Short);
if (NS_SUCCEEDED(mozilla::intl::AppDateTimeFormat::Format(
style, 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);
}
//----------------------------------------------------------------------
#ifdef DEBUG_FRAME_DUMP
nsresult nsPageSequenceFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"PageSequence"_ns, aResult);
}
#endif
// 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;
}
// Begin printing of the document
mCurrentSheetIdx = 0;
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);
}
}
}
// Note: this isn't quite a full tree traversal, since we exclude any
// nsPageFame children that have the NS_PAGE_SKIPPED_BY_CUSTOM_RANGE state-bit.
static void GetPrintCanvasElementsInSheet(
PrintedSheetFrame* aSheetFrame, nsTArray<RefPtr<HTMLCanvasElement>>* aArr) {
MOZ_ASSERT(aSheetFrame, "Caller should've null-checked for us already");
for (nsIFrame* child : aSheetFrame->PrincipalChildList()) {
// Exclude any pages that are technically children but are skipped by a
// custom range; they're not meant to be printed, so we don't want to
// waste time rendering their canvas descendants.
MOZ_ASSERT(child->IsPageFrame(),
"PrintedSheetFrame's children must all be nsPageFrames");
auto* pageFrame = static_cast<nsPageFrame*>(child);
if (!pageFrame->HasAnyStateBits(NS_PAGE_SKIPPED_BY_CUSTOM_RANGE)) {
GetPrintCanvasElementsInFrame(pageFrame, aArr);
}
}
}
PrintedSheetFrame* nsPageSequenceFrame::GetCurrentSheetFrame() {
uint32_t i = 0;
for (nsIFrame* child : mFrames) {
MOZ_ASSERT(child->IsPrintedSheetFrame(),
"Our children must all be PrintedSheetFrame");
if (i == mCurrentSheetIdx) {
return static_cast<PrintedSheetFrame*>(child);
}
++i;
}
return nullptr;
}
nsresult nsPageSequenceFrame::PrePrintNextSheet(nsITimerCallback* aCallback,
bool* aDone) {
PrintedSheetFrame* currentSheet = GetCurrentSheetFrame();
if (!currentSheet) {
*aDone = true;
return NS_ERROR_FAILURE;
}
if (!PresContext()->IsRootPaginatedDocument()) {
// XXXdholbert I don't think this clause is ever actually visited in
// practice... Maybe we should warn & return a failure code? There used to
// be a comment here explaining why we don't need to proceed past this
// point for print preview, but in fact, this function isn't even called for
// print preview.
*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;
GetPrintCanvasElementsInSheet(currentSheet, &mCurrentCanvasList);
if (!mCurrentCanvasList.IsEmpty()) {
nsresult rv = NS_OK;
// Begin printing of the document
nsDeviceContext* dc = PresContext()->DeviceContext();
PR_PL(("\n"));
PR_PL(("***************** BeginPage *****************\n"));
const IntSize sizeInPoints = currentSheet->GetPrintTargetSizeInPoints(
dc->AppUnitsPerPhysicalInch());
rv = dc->BeginPage(sizeInPoints);
NS_ENSURE_SUCCESS(rv, rv);
mCalledBeginPage = true;
UniquePtr<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::PrintNextSheet() {
// 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)
PrintedSheetFrame* currentSheetFrame = GetCurrentSheetFrame();
if (!currentSheetFrame) {
return NS_ERROR_FAILURE;
}
nsresult rv = NS_OK;
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"));
const IntSize sizeInPoints =
currentSheetFrame->GetPrintTargetSizeInPoints(
dc->AppUnitsPerPhysicalInch());
rv = dc->BeginPage(sizeInPoints);
NS_ENSURE_SUCCESS(rv, rv);
}
}
PR_PL(("SeqFr::PrintNextSheet -> %p SheetIdx: %d", currentSheetFrame,
mCurrentSheetIdx));
// CreateRenderingContext can fail
UniquePtr<gfxContext> gCtx = dc->CreateRenderingContext();
NS_ENSURE_TRUE(gCtx, NS_ERROR_OUT_OF_MEMORY);
nsRect drawingRect(nsPoint(0, 0), currentSheetFrame->GetSize());
nsRegion drawingRegion(drawingRect);
nsLayoutUtils::PaintFrame(gCtx.get(), currentSheetFrame, drawingRegion,
NS_RGBA(0, 0, 0, 0),
nsDisplayListBuilderMode::PaintForPrinting,
nsLayoutUtils::PaintFrameFlags::SyncDecodeImages);
return rv;
}
nsresult nsPageSequenceFrame::DoPageEnd() {
nsresult rv = NS_OK;
if (PresContext()->IsRootPaginatedDocument()) {
PR_PL(("***************** End Page (DoPageEnd) *****************\n"));
rv = PresContext()->DeviceContext()->EndPage();
// Fall through to clean up resources/state below even if EndPage failed.
}
ResetPrintCanvasList();
mCalledBeginPage = false;
mCurrentSheetIdx++;
return rv;
}
static gfx::Matrix4x4 ComputePageSequenceTransform(const nsIFrame* aFrame,
float aAppUnitsPerPixel) {
MOZ_ASSERT(aFrame->IsPageSequenceFrame());
float scale =
static_cast<const nsPageSequenceFrame*>(aFrame)->GetPrintPreviewScale();
return gfx::Matrix4x4::Scaling(scale, scale, 1);
}
nsIFrame::ComputeTransformFunction nsPageSequenceFrame::GetTransformGetter()
const {
return ComputePageSequenceTransform;
}
void nsPageSequenceFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
aBuilder->SetDisablePartialUpdates(true);
DisplayBorderBackgroundOutline(aBuilder, aLists);
nsDisplayList content(aBuilder);
{
// 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(),
nsDisplayTransform::WithTransformGetter);
aLists.Content()->AppendToTop(&content);
}
//------------------------------------------------------------------------------
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;
}
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