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fune/layout/generic/nsPageFrame.cpp
Emilio Cobos Álvarez 8101ae2ea8 Bug 1523071 - Use Rust lengths for margin / padding / inset. r=jwatt 
Also for the intersection observer root margin, since it was easier to fix it
up and clean it up than not doing it.

This is the first big step to get rid of nscoord. It duplicates a bit of logic
in nsLayoutUtils since for now max/min-width/height are still represented with
nsStyleCoord, but I think I prefer to land this incrementally.

I didn't add helpers for the physical accessors of the style rect sides that
nsStyleSides has (top/bottom/left/right) since I think we generally should
encourage the logical versions, but let me know if you want me to do that.

Differential Revision: https://phabricator.services.mozilla.com/D17739
2019-02-10 04:11:58 +01:00

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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 "nsPageFrame.h"
#include "mozilla/gfx/2D.h"
#include "gfxContext.h"
#include "nsDeviceContext.h"
#include "nsFontMetrics.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsIPresShell.h"
#include "nsPageContentFrame.h"
#include "nsDisplayList.h"
#include "nsSimplePageSequenceFrame.h" // for nsSharedPageData
#include "nsTextFormatter.h" // for page number localization formatting
#include "nsBidiUtils.h"
#include "nsIPrintSettings.h"
#include "mozilla/Logging.h"
extern mozilla::LazyLogModule gLayoutPrintingLog;
#define PR_PL(_p1) MOZ_LOG(gLayoutPrintingLog, mozilla::LogLevel::Debug, _p1)
using namespace mozilla;
using namespace mozilla::gfx;
nsPageFrame* NS_NewPageFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsPageFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsPageFrame)
NS_QUERYFRAME_HEAD(nsPageFrame)
NS_QUERYFRAME_ENTRY(nsPageFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
nsPageFrame::nsPageFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsContainerFrame(aStyle, aPresContext, kClassID) {}
nsPageFrame::~nsPageFrame() {}
void nsPageFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsPageFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_ASSERTION(
mFrames.FirstChild() && mFrames.FirstChild()->IsPageContentFrame(),
"pageFrame must have a pageContentFrame child");
// Resize our frame allowing it only to be as big as we are
// XXX Pay attention to the page's border and padding...
if (mFrames.NotEmpty()) {
nsIFrame* frame = mFrames.FirstChild();
// When the reflow size is NS_UNCONSTRAINEDSIZE it means we are reflowing
// a single page to print selection. So this means we want to use
// NS_UNCONSTRAINEDSIZE without altering it
nscoord avHeight;
if (mPD->mReflowSize.height == NS_UNCONSTRAINEDSIZE) {
avHeight = NS_UNCONSTRAINEDSIZE;
} else {
avHeight = mPD->mReflowSize.height;
}
nsSize maxSize(mPD->mReflowSize.width, avHeight);
float scale = aPresContext->GetPageScale();
maxSize.width = NSToCoordCeil(maxSize.width / scale);
if (maxSize.height != NS_UNCONSTRAINEDSIZE) {
maxSize.height = NSToCoordCeil(maxSize.height / scale);
}
// Get the number of Twips per pixel from the PresContext
nscoord onePixelInTwips = nsPresContext::CSSPixelsToAppUnits(1);
// insurance against infinite reflow, when reflowing less than a pixel
// XXX Shouldn't we do something more friendly when invalid margins
// are set?
if (maxSize.width < onePixelInTwips || maxSize.height < onePixelInTwips) {
aDesiredSize.ClearSize();
NS_WARNING("Reflow aborted; no space for content");
return;
}
ReflowInput kidReflowInput(aPresContext, aReflowInput, frame,
LogicalSize(frame->GetWritingMode(), maxSize));
kidReflowInput.mFlags.mIsTopOfPage = true;
kidReflowInput.mFlags.mTableIsSplittable = true;
// Use the margins given in the @page rule.
// If a margin is 'auto', use the margin from the print settings for that
// side.
const auto& marginStyle = kidReflowInput.mStyleMargin->mMargin;
NS_FOR_CSS_SIDES(side) {
if (marginStyle.Get(side).IsAuto()) {
mPageContentMargin.Side(side) = mPD->mReflowMargin.Side(side);
} else {
mPageContentMargin.Side(side) =
kidReflowInput.ComputedPhysicalMargin().Side(side);
}
}
nscoord maxWidth = maxSize.width - mPageContentMargin.LeftRight() / scale;
nscoord maxHeight;
if (maxSize.height == NS_UNCONSTRAINEDSIZE) {
maxHeight = NS_UNCONSTRAINEDSIZE;
} else {
maxHeight = maxSize.height - mPageContentMargin.TopBottom() / scale;
}
// Check the width and height, if they're too small we reset the margins
// back to the default.
if (maxWidth < onePixelInTwips ||
(maxHeight != NS_UNCONSTRAINEDSIZE && maxHeight < onePixelInTwips)) {
NS_FOR_CSS_SIDES(side) {
mPageContentMargin.Side(side) = mPD->mReflowMargin.Side(side);
}
maxWidth = maxSize.width - mPageContentMargin.LeftRight() / scale;
if (maxHeight != NS_UNCONSTRAINEDSIZE) {
maxHeight = maxSize.height - mPageContentMargin.TopBottom() / scale;
}
}
kidReflowInput.SetComputedWidth(maxWidth);
kidReflowInput.SetComputedHeight(maxHeight);
// calc location of frame
nscoord xc = mPageContentMargin.left;
nscoord yc = mPageContentMargin.top;
// Get the child's desired size
ReflowChild(frame, aPresContext, aDesiredSize, kidReflowInput, xc, yc, 0,
aStatus);
// Place and size the child
FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowInput, xc,
yc, 0);
NS_ASSERTION(!aStatus.IsFullyComplete() || !frame->GetNextInFlow(),
"bad child flow list");
}
PR_PL(("PageFrame::Reflow %p ", this));
PR_PL(("[%d,%d][%d,%d]\n", aDesiredSize.Width(), aDesiredSize.Height(),
aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
// Return our desired size
WritingMode wm = aReflowInput.GetWritingMode();
aDesiredSize.ISize(wm) = aReflowInput.AvailableISize();
if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE) {
aDesiredSize.BSize(wm) = aReflowInput.AvailableBSize();
}
aDesiredSize.SetOverflowAreasToDesiredBounds();
FinishAndStoreOverflow(&aDesiredSize);
PR_PL(("PageFrame::Reflow %p ", this));
PR_PL(("[%d,%d]\n", aReflowInput.AvailableWidth(),
aReflowInput.AvailableHeight()));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
#ifdef DEBUG_FRAME_DUMP
nsresult nsPageFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(NS_LITERAL_STRING("Page"), aResult);
}
#endif
void nsPageFrame::ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr) {
aNewStr = aStr;
// Search to see if the &D code is in the string
// then subst in the current date/time
NS_NAMED_LITERAL_STRING(kDate, "&D");
if (aStr.Find(kDate) != kNotFound) {
aNewStr.ReplaceSubstring(kDate, mPD->mDateTimeStr);
}
// NOTE: Must search for &PT before searching for &P
//
// Search to see if the "page number and page" total code are in the string
// and replace the page number and page total code with the actual
// values
NS_NAMED_LITERAL_STRING(kPageAndTotal, "&PT");
if (aStr.Find(kPageAndTotal) != kNotFound) {
nsAutoString uStr;
nsTextFormatter::ssprintf(uStr, mPD->mPageNumAndTotalsFormat.get(),
mPageNum, mTotNumPages);
aNewStr.ReplaceSubstring(kPageAndTotal, uStr);
}
// Search to see if the page number code is in the string
// and replace the page number code with the actual value
NS_NAMED_LITERAL_STRING(kPage, "&P");
if (aStr.Find(kPage) != kNotFound) {
nsAutoString uStr;
nsTextFormatter::ssprintf(uStr, mPD->mPageNumFormat.get(), mPageNum);
aNewStr.ReplaceSubstring(kPage, uStr);
}
NS_NAMED_LITERAL_STRING(kTitle, "&T");
if (aStr.Find(kTitle) != kNotFound) {
aNewStr.ReplaceSubstring(kTitle, mPD->mDocTitle);
}
NS_NAMED_LITERAL_STRING(kDocURL, "&U");
if (aStr.Find(kDocURL) != kNotFound) {
aNewStr.ReplaceSubstring(kDocURL, mPD->mDocURL);
}
NS_NAMED_LITERAL_STRING(kPageTotal, "&L");
if (aStr.Find(kPageTotal) != kNotFound) {
nsAutoString uStr;
nsTextFormatter::ssprintf(uStr, mPD->mPageNumFormat.get(), mTotNumPages);
aNewStr.ReplaceSubstring(kPageTotal, uStr);
}
}
//------------------------------------------------------------------------------
nscoord nsPageFrame::GetXPosition(gfxContext& aRenderingContext,
nsFontMetrics& aFontMetrics,
const nsRect& aRect, int32_t aJust,
const nsString& aStr) {
nscoord width = nsLayoutUtils::AppUnitWidthOfStringBidi(
aStr, this, aFontMetrics, aRenderingContext);
nscoord x = aRect.x;
switch (aJust) {
case nsIPrintSettings::kJustLeft:
x += mPD->mEdgePaperMargin.left;
break;
case nsIPrintSettings::kJustCenter:
x += (aRect.width - width) / 2;
break;
case nsIPrintSettings::kJustRight:
x += aRect.width - width - mPD->mEdgePaperMargin.right;
break;
} // switch
return x;
}
// Draw a header or footer
// @param aRenderingContext - rendering content ot draw into
// @param aHeaderFooter - indicates whether it is a header or footer
// @param aStrLeft - string for the left header or footer; can be empty
// @param aStrCenter - string for the center header or footer; can be empty
// @param aStrRight - string for the right header or footer; can be empty
// @param aRect - the rect of the page
// @param aAscent - the ascent of the font
// @param aHeight - the height of the font
void nsPageFrame::DrawHeaderFooter(
gfxContext& aRenderingContext, nsFontMetrics& aFontMetrics,
nsHeaderFooterEnum aHeaderFooter, const nsString& aStrLeft,
const nsString& aStrCenter, const nsString& aStrRight, const nsRect& aRect,
nscoord aAscent, nscoord aHeight) {
int32_t numStrs = 0;
if (!aStrLeft.IsEmpty()) numStrs++;
if (!aStrCenter.IsEmpty()) numStrs++;
if (!aStrRight.IsEmpty()) numStrs++;
if (numStrs == 0) return;
nscoord strSpace = aRect.width / numStrs;
if (!aStrLeft.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aFontMetrics, aHeaderFooter,
nsIPrintSettings::kJustLeft, aStrLeft, aRect, aAscent,
aHeight, strSpace);
}
if (!aStrCenter.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aFontMetrics, aHeaderFooter,
nsIPrintSettings::kJustCenter, aStrCenter, aRect, aAscent,
aHeight, strSpace);
}
if (!aStrRight.IsEmpty()) {
DrawHeaderFooter(aRenderingContext, aFontMetrics, aHeaderFooter,
nsIPrintSettings::kJustRight, aStrRight, aRect, aAscent,
aHeight, strSpace);
}
}
// Draw a header or footer string
// @param aRenderingContext - rendering context to draw into
// @param aHeaderFooter - indicates whether it is a header or footer
// @param aJust - indicates where the string is located within the header/footer
// @param aStr - the string to be drawn
// @param aRect - the rect of the page
// @param aHeight - the height of the font
// @param aAscent - the ascent of the font
// @param aWidth - available width for the string
void nsPageFrame::DrawHeaderFooter(gfxContext& aRenderingContext,
nsFontMetrics& aFontMetrics,
nsHeaderFooterEnum aHeaderFooter,
int32_t aJust, const nsString& aStr,
const nsRect& aRect, nscoord aAscent,
nscoord aHeight, nscoord aWidth) {
nscoord contentWidth =
aWidth - (mPD->mEdgePaperMargin.left + mPD->mEdgePaperMargin.right);
DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
if ((aHeaderFooter == eHeader && aHeight < mPageContentMargin.top) ||
(aHeaderFooter == eFooter && aHeight < mPageContentMargin.bottom)) {
nsAutoString str;
ProcessSpecialCodes(aStr, str);
int32_t indx;
int32_t textWidth = 0;
const char16_t* text = str.get();
int32_t len = (int32_t)str.Length();
if (len == 0) {
return; // bail is empty string
}
// find how much text fits, the "position" is the size of the available area
if (nsLayoutUtils::BinarySearchForPosition(
drawTarget, aFontMetrics, text, 0, 0, 0, len, int32_t(contentWidth),
indx, textWidth)) {
if (indx < len - 1) {
// we can't fit in all the text
if (indx > 3) {
// But we can fit in at least 4 chars. Show all but 3 of them, then
// an ellipsis.
// XXXbz for non-plane0 text, this may be cutting things in the
// middle of a codepoint! Also, we have no guarantees that the three
// dots will fit in the space the three chars we removed took up with
// these font metrics!
str.Truncate(indx - 3);
str.AppendLiteral("...");
} else {
// We can only fit 3 or fewer chars. Just show nothing
str.Truncate();
}
}
} else {
return; // bail if couldn't find the correct length
}
if (HasRTLChars(str)) {
PresContext()->SetBidiEnabled();
}
// cacl the x and y positions of the text
nscoord x =
GetXPosition(aRenderingContext, aFontMetrics, aRect, aJust, str);
nscoord y;
if (aHeaderFooter == eHeader) {
y = aRect.y + mPD->mEdgePaperMargin.top;
} else {
y = aRect.YMost() - aHeight - mPD->mEdgePaperMargin.bottom;
}
// set up new clip and draw the text
aRenderingContext.Save();
aRenderingContext.Clip(NSRectToSnappedRect(
aRect, PresContext()->AppUnitsPerDevPixel(), *drawTarget));
aRenderingContext.SetColor(Color(0.f, 0.f, 0.f));
nsLayoutUtils::DrawString(this, aFontMetrics, &aRenderingContext, str.get(),
str.Length(), nsPoint(x, y + aAscent), nullptr,
DrawStringFlags::eForceHorizontal);
aRenderingContext.Restore();
}
}
/**
* Remove all leaf display items that are not for descendants of
* aBuilder->GetReferenceFrame() from aList.
* @param aPage the page we're constructing the display list for
* @param aExtraPage the page we constructed aList for
* @param aList the list that is modified in-place
*/
static void PruneDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
nsPageFrame* aPage,
nsIFrame* aExtraPage,
nsDisplayList* aList) {
nsDisplayList newList;
while (true) {
nsDisplayItem* i = aList->RemoveBottom();
if (!i) break;
nsDisplayList* subList = i->GetSameCoordinateSystemChildren();
if (subList) {
PruneDisplayListForExtraPage(aBuilder, aPage, aExtraPage, subList);
i->UpdateBounds(aBuilder);
} else {
nsIFrame* f = i->Frame();
if (!nsLayoutUtils::IsProperAncestorFrameCrossDoc(aPage, f)) {
// We're throwing this away so call its destructor now. The memory
// is owned by aBuilder which destroys all items at once.
i->Destroy(aBuilder);
continue;
}
}
newList.AppendToTop(i);
}
aList->AppendToTop(&newList);
}
static void BuildDisplayListForExtraPage(nsDisplayListBuilder* aBuilder,
nsPageFrame* aPage,
nsIFrame* aExtraPage,
nsDisplayList* aList) {
// The only content in aExtraPage we care about is out-of-flow content whose
// placeholders have occurred in aPage. If
// NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO is not set, then aExtraPage has
// no such content.
if (!aExtraPage->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
return;
}
nsDisplayList list;
aExtraPage->BuildDisplayListForStackingContext(aBuilder, &list);
PruneDisplayListForExtraPage(aBuilder, aPage, aExtraPage, &list);
aList->AppendToTop(&list);
}
static nsIFrame* GetNextPage(nsIFrame* aPageContentFrame) {
// XXX ugh
nsIFrame* pageFrame = aPageContentFrame->GetParent();
NS_ASSERTION(pageFrame->IsPageFrame(),
"pageContentFrame has unexpected parent");
nsIFrame* nextPageFrame = pageFrame->GetNextSibling();
if (!nextPageFrame) return nullptr;
NS_ASSERTION(nextPageFrame->IsPageFrame(),
"pageFrame's sibling is not a page frame...");
nsIFrame* f = nextPageFrame->PrincipalChildList().FirstChild();
NS_ASSERTION(f, "pageFrame has no page content frame!");
NS_ASSERTION(f->IsPageContentFrame(),
"pageFrame's child is not page content!");
return f;
}
static gfx::Matrix4x4 ComputePageTransform(nsIFrame* aFrame,
float aAppUnitsPerPixel) {
float scale = aFrame->PresContext()->GetPageScale();
return gfx::Matrix4x4::Scaling(scale, scale, 1);
}
class nsDisplayHeaderFooter final : public nsDisplayItem {
public:
nsDisplayHeaderFooter(nsDisplayListBuilder* aBuilder, nsPageFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayHeaderFooter);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayHeaderFooter() { MOZ_COUNT_DTOR(nsDisplayHeaderFooter); }
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) override {
#ifdef DEBUG
nsPageFrame* pageFrame = do_QueryFrame(mFrame);
MOZ_ASSERT(pageFrame, "We should have an nsPageFrame");
#endif
static_cast<nsPageFrame*>(mFrame)->PaintHeaderFooter(
*aCtx, ToReferenceFrame(), mDisableSubpixelAA);
}
NS_DISPLAY_DECL_NAME("HeaderFooter", TYPE_HEADER_FOOTER)
virtual nsRect GetComponentAlphaBounds(
nsDisplayListBuilder* aBuilder) const override {
bool snap;
return GetBounds(aBuilder, &snap);
}
};
//------------------------------------------------------------------------------
void nsPageFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
nsDisplayListCollection set(aBuilder);
if (PresContext()->IsScreen()) {
DisplayBorderBackgroundOutline(aBuilder, aLists);
}
nsIFrame* child = mFrames.FirstChild();
float scale = PresContext()->GetPageScale();
nsRect clipRect(nsPoint(0, 0), child->GetSize());
// Note: this computation matches how we compute maxSize.height
// in nsPageFrame::Reflow
nscoord expectedPageContentHeight = NSToCoordCeil(GetSize().height / scale);
if (clipRect.height > expectedPageContentHeight) {
// We're doing print-selection, with one long page-content frame.
// Clip to the appropriate page-content slice for the current page.
NS_ASSERTION(mPageNum > 0, "page num should be positive");
// Note: The pageContentFrame's y-position has been set such that a zero
// y-value matches the top edge of the current page. So, to clip to the
// current page's content (in coordinates *relative* to the page content
// frame), we just negate its y-position and add the top margin.
clipRect.y =
NSToCoordCeil((-child->GetRect().y + mPD->mReflowMargin.top) / scale);
clipRect.height = expectedPageContentHeight;
NS_ASSERTION(clipRect.y < child->GetSize().height,
"Should be clipping to region inside the page content bounds");
}
clipRect += aBuilder->ToReferenceFrame(child);
nsDisplayList content;
{
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
// Overwrite current clip, since we're going to wrap in a transform
// and the current clip is no longer meaningful.
clipState.Clear();
clipState.ClipContainingBlockDescendants(clipRect, nullptr);
nsRect visibleRect = child->GetVisualOverflowRectRelativeToSelf();
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, child, visibleRect, visibleRect,
aBuilder->IsAtRootOfPseudoStackingContext());
child->BuildDisplayListForStackingContext(aBuilder, &content);
// We may need to paint out-of-flow frames whose placeholders are
// on other pages. Add those pages to our display list. Note that
// out-of-flow frames can't be placed after their placeholders so
// we don't have to process earlier pages. The display lists for
// these extra pages are pruned so that only display items for the
// page we currently care about (which we would have reached by
// following placeholders to their out-of-flows) end up on the list.
nsIFrame* page = child;
while ((page = GetNextPage(page)) != nullptr) {
nsRect childVisible = visibleRect + child->GetOffsetTo(page);
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, page, childVisible, childVisible,
aBuilder->IsAtRootOfPseudoStackingContext());
BuildDisplayListForExtraPage(aBuilder, this, page, &content);
}
// Invoke AutoBuildingDisplayList to ensure that the correct visibleRect
// is used to compute the visible rect if AddCanvasBackgroundColorItem
// creates a display item.
nsDisplayListBuilder::AutoBuildingDisplayList building(
aBuilder, child, visibleRect, visibleRect, true);
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that AddCanvasBackgroundColorItem
// can monkey with the contents if necessary.
nsRect backgroundRect =
nsRect(aBuilder->ToReferenceFrame(child), child->GetSize());
PresContext()->GetPresShell()->AddCanvasBackgroundColorItem(
*aBuilder, content, child, backgroundRect, NS_RGBA(0, 0, 0, 0));
}
content.AppendToTop(MakeDisplayItem<nsDisplayTransform>(
aBuilder, child, &content, content.GetBuildingRect(),
::ComputePageTransform));
set.Content()->AppendToTop(&content);
if (PresContext()->IsRootPaginatedDocument()) {
set.Content()->AppendToTop(
MakeDisplayItem<nsDisplayHeaderFooter>(aBuilder, this));
}
set.MoveTo(aLists);
}
//------------------------------------------------------------------------------
void nsPageFrame::SetPageNumInfo(int32_t aPageNumber, int32_t aTotalPages) {
mPageNum = aPageNumber;
mTotNumPages = aTotalPages;
}
void nsPageFrame::PaintHeaderFooter(gfxContext& aRenderingContext, nsPoint aPt,
bool aDisableSubpixelAA) {
nsPresContext* pc = PresContext();
if (!mPD->mPrintSettings) {
if (pc->Type() == nsPresContext::eContext_PrintPreview || pc->IsDynamic())
mPD->mPrintSettings = pc->GetPrintSettings();
if (!mPD->mPrintSettings) return;
}
nsRect rect(aPt, mRect.Size());
aRenderingContext.SetColor(Color(0.f, 0.f, 0.f));
DrawTargetAutoDisableSubpixelAntialiasing disable(
aRenderingContext.GetDrawTarget(), aDisableSubpixelAA);
// Get the FontMetrics to determine width.height of strings
nsFontMetrics::Params params;
params.userFontSet = pc->GetUserFontSet();
params.textPerf = pc->GetTextPerfMetrics();
RefPtr<nsFontMetrics> fontMet =
pc->DeviceContext()->GetMetricsFor(mPD->mHeadFootFont, params);
nscoord ascent = 0;
nscoord visibleHeight = 0;
if (fontMet) {
visibleHeight = fontMet->MaxHeight();
ascent = fontMet->MaxAscent();
}
// print document headers and footers
nsString headerLeft, headerCenter, headerRight;
mPD->mPrintSettings->GetHeaderStrLeft(headerLeft);
mPD->mPrintSettings->GetHeaderStrCenter(headerCenter);
mPD->mPrintSettings->GetHeaderStrRight(headerRight);
DrawHeaderFooter(aRenderingContext, *fontMet, eHeader, headerLeft,
headerCenter, headerRight, rect, ascent, visibleHeight);
nsString footerLeft, footerCenter, footerRight;
mPD->mPrintSettings->GetFooterStrLeft(footerLeft);
mPD->mPrintSettings->GetFooterStrCenter(footerCenter);
mPD->mPrintSettings->GetFooterStrRight(footerRight);
DrawHeaderFooter(aRenderingContext, *fontMet, eFooter, footerLeft,
footerCenter, footerRight, rect, ascent, visibleHeight);
}
void nsPageFrame::SetSharedPageData(nsSharedPageData* aPD) {
mPD = aPD;
// Set the shared data into the page frame before reflow
nsPageContentFrame* pcf =
static_cast<nsPageContentFrame*>(mFrames.FirstChild());
if (pcf) {
pcf->SetSharedPageData(mPD);
}
}
void nsPageFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
MOZ_ASSERT(mFrames.FirstChild() && mFrames.FirstChild()->IsPageContentFrame(),
"pageFrame must have a pageContentFrame child");
aResult.AppendElement(mFrames.FirstChild());
}
nsIFrame* NS_NewPageBreakFrame(nsIPresShell* aPresShell,
ComputedStyle* aStyle) {
MOZ_ASSERT(aPresShell, "null PresShell");
// check that we are only creating page break frames when printing
NS_ASSERTION(aPresShell->GetPresContext()->IsPaginated(),
"created a page break frame while not printing");
return new (aPresShell)
nsPageBreakFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsPageBreakFrame)
nsPageBreakFrame::nsPageBreakFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsLeafFrame(aStyle, aPresContext, kClassID), mHaveReflowed(false) {}
nsPageBreakFrame::~nsPageBreakFrame() {}
nscoord nsPageBreakFrame::GetIntrinsicISize() {
return nsPresContext::CSSPixelsToAppUnits(1);
}
nscoord nsPageBreakFrame::GetIntrinsicBSize() { return 0; }
void nsPageBreakFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
DO_GLOBAL_REFLOW_COUNT("nsPageBreakFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
// Override reflow, since we don't want to deal with what our
// computed values are.
WritingMode wm = aReflowInput.GetWritingMode();
LogicalSize finalSize(wm, GetIntrinsicISize(),
aReflowInput.AvailableBSize() == NS_UNCONSTRAINEDSIZE
? 0
: aReflowInput.AvailableBSize());
// round the height down to the nearest pixel
finalSize.BSize(wm) -=
finalSize.BSize(wm) % nsPresContext::CSSPixelsToAppUnits(1);
aDesiredSize.SetSize(wm, finalSize);
// Note: not using NS_FRAME_FIRST_REFLOW here, since it's not clear whether
// DidReflow will always get called before the next Reflow() call.
mHaveReflowed = true;
}
#ifdef DEBUG_FRAME_DUMP
nsresult nsPageBreakFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(NS_LITERAL_STRING("PageBreak"), aResult);
}
#endif
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