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/*
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2007-2019 Apple Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "PrintContext.h"
#include "ElementTraversal.h"
#include "GraphicsContext.h"
#include "Frame.h"
#include "FrameView.h"
#include "LengthBox.h"
#include "RenderView.h"
#include "RuntimeEnabledFeatures.h"
#include "StyleInheritedData.h"
#include "StyleResolver.h"
#include "StyleScope.h"
#include <wtf/text/StringConcatenateNumbers.h>
namespace WebCore {
PrintContext::PrintContext(Frame* frame)
: FrameDestructionObserver(frame)
{
}
PrintContext::~PrintContext()
{
if (m_isPrinting)
end();
}
void PrintContext::computePageRects(const FloatRect& printRect, float headerHeight, float footerHeight, float userScaleFactor, float& outPageHeight, bool allowHorizontalTiling)
{
if (!frame())
return;
auto& frame = *this->frame();
m_pageRects.clear();
outPageHeight = 0;
if (!frame.document() || !frame.view() || !frame.document()->renderView())
return;
if (userScaleFactor <= 0) {
LOG_ERROR("userScaleFactor has bad value %.2f", userScaleFactor);
return;
}
RenderView* view = frame.document()->renderView();
const IntRect& documentRect = view->documentRect();
FloatSize pageSize = frame.resizePageRectsKeepingRatio(FloatSize(printRect.width(), printRect.height()), FloatSize(documentRect.width(), documentRect.height()));
float pageWidth = pageSize.width();
float pageHeight = pageSize.height();
outPageHeight = pageHeight; // this is the height of the page adjusted by margins
pageHeight -= headerHeight + footerHeight;
if (pageHeight <= 0) {
LOG_ERROR("pageHeight has bad value %.2f", pageHeight);
return;
}
computePageRectsWithPageSizeInternal(FloatSize(pageWidth / userScaleFactor, pageHeight / userScaleFactor), allowHorizontalTiling);
}
FloatBoxExtent PrintContext::computedPageMargin(FloatBoxExtent printMargin)
{
if (!frame() || !frame()->document())
return printMargin;
if (!RuntimeEnabledFeatures::sharedFeatures().pageAtRuleSupportEnabled())
return printMargin;
// FIXME Currently no pseudo class is supported.
auto style = frame()->document()->styleScope().resolver().styleForPage(0);
float pixelToPointScaleFactor = 1 / CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(CSSUnitType::CSS_PT).value();
return { style->marginTop().isAuto() ? printMargin.top() : style->marginTop().value() * pixelToPointScaleFactor,
style->marginRight().isAuto() ? printMargin.right() : style->marginRight().value() * pixelToPointScaleFactor,
style->marginBottom().isAuto() ? printMargin.bottom() : style->marginBottom().value() * pixelToPointScaleFactor,
style->marginLeft().isAuto() ? printMargin.left() : style->marginLeft().value() * pixelToPointScaleFactor };
}
FloatSize PrintContext::computedPageSize(FloatSize pageSize, FloatBoxExtent printMargin)
{
auto computedMargin = computedPageMargin(printMargin);
if (computedMargin == printMargin)
return pageSize;
auto horizontalMarginDelta = (printMargin.left() - computedMargin.left()) + (printMargin.right() - computedMargin.right());
auto verticalMarginDelta = (printMargin.top() - computedMargin.top()) + (printMargin.bottom() - computedMargin.bottom());
return { pageSize.width() + horizontalMarginDelta, pageSize.height() + verticalMarginDelta };
}
void PrintContext::computePageRectsWithPageSize(const FloatSize& pageSizeInPixels, bool allowHorizontalTiling)
{
m_pageRects.clear();
computePageRectsWithPageSizeInternal(pageSizeInPixels, allowHorizontalTiling);
}
void PrintContext::computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels, bool allowInlineDirectionTiling)
{
if (!frame())
return;
auto& frame = *this->frame();
if (!frame.document() || !frame.view() || !frame.document()->renderView())
return;
RenderView* view = frame.document()->renderView();
IntRect docRect = view->documentRect();
int pageWidth = pageSizeInPixels.width();
int pageHeight = pageSizeInPixels.height();
bool isHorizontal = view->style().isHorizontalWritingMode();
int docLogicalHeight = isHorizontal ? docRect.height() : docRect.width();
int pageLogicalHeight = isHorizontal ? pageHeight : pageWidth;
int pageLogicalWidth = isHorizontal ? pageWidth : pageHeight;
int inlineDirectionStart;
int inlineDirectionEnd;
int blockDirectionStart;
int blockDirectionEnd;
if (isHorizontal) {
if (view->style().isFlippedBlocksWritingMode()) {
blockDirectionStart = docRect.maxY();
blockDirectionEnd = docRect.y();
} else {
blockDirectionStart = docRect.y();
blockDirectionEnd = docRect.maxY();
}
inlineDirectionStart = view->style().isLeftToRightDirection() ? docRect.x() : docRect.maxX();
inlineDirectionEnd = view->style().isLeftToRightDirection() ? docRect.maxX() : docRect.x();
} else {
if (view->style().isFlippedBlocksWritingMode()) {
blockDirectionStart = docRect.maxX();
blockDirectionEnd = docRect.x();
} else {
blockDirectionStart = docRect.x();
blockDirectionEnd = docRect.maxX();
}
inlineDirectionStart = view->style().isLeftToRightDirection() ? docRect.y() : docRect.maxY();
inlineDirectionEnd = view->style().isLeftToRightDirection() ? docRect.maxY() : docRect.y();
}
unsigned pageCount = ceilf((float)docLogicalHeight / pageLogicalHeight);
for (unsigned i = 0; i < pageCount; ++i) {
int pageLogicalTop = blockDirectionEnd > blockDirectionStart ?
blockDirectionStart + i * pageLogicalHeight :
blockDirectionStart - (i + 1) * pageLogicalHeight;
if (allowInlineDirectionTiling) {
for (int currentInlinePosition = inlineDirectionStart;
inlineDirectionEnd > inlineDirectionStart ? currentInlinePosition < inlineDirectionEnd : currentInlinePosition > inlineDirectionEnd;
currentInlinePosition += (inlineDirectionEnd > inlineDirectionStart ? pageLogicalWidth : -pageLogicalWidth)) {
int pageLogicalLeft = inlineDirectionEnd > inlineDirectionStart ? currentInlinePosition : currentInlinePosition - pageLogicalWidth;
IntRect pageRect(pageLogicalLeft, pageLogicalTop, pageLogicalWidth, pageLogicalHeight);
if (!isHorizontal)
pageRect = pageRect.transposedRect();
m_pageRects.append(pageRect);
}
} else {
int pageLogicalLeft = inlineDirectionEnd > inlineDirectionStart ? inlineDirectionStart : inlineDirectionStart - pageLogicalWidth;
IntRect pageRect(pageLogicalLeft, pageLogicalTop, pageLogicalWidth, pageLogicalHeight);
if (!isHorizontal)
pageRect = pageRect.transposedRect();
m_pageRects.append(pageRect);
}
}
}
void PrintContext::begin(float width, float height)
{
if (!frame())
return;
Ref frame = *this->frame();
// This function can be called multiple times to adjust printing parameters without going back to screen mode.
m_isPrinting = true;
FloatSize originalPageSize = FloatSize(width, height);
FloatSize minLayoutSize = frame->resizePageRectsKeepingRatio(originalPageSize, FloatSize(width * minimumShrinkFactor(), height * minimumShrinkFactor()));
// This changes layout, so callers need to make sure that they don't paint to screen while in printing mode.
frame->setPrinting(true, minLayoutSize, originalPageSize, maximumShrinkFactor() / minimumShrinkFactor(), AdjustViewSize);
}
float PrintContext::computeAutomaticScaleFactor(const FloatSize& availablePaperSize)
{
if (!frame())
return 1;
auto& frame = *this->frame();
if (!frame.view())
return 1;
bool useViewWidth = true;
if (frame.document() && frame.document()->renderView())
useViewWidth = frame.document()->renderView()->style().isHorizontalWritingMode();
float viewLogicalWidth = useViewWidth ? frame.view()->contentsWidth() : frame.view()->contentsHeight();
if (viewLogicalWidth < 1)
return 1;
float maxShrinkToFitScaleFactor = 1 / maximumShrinkFactor();
float shrinkToFitScaleFactor = (useViewWidth ? availablePaperSize.width() : availablePaperSize.height()) / viewLogicalWidth;
return std::max(maxShrinkToFitScaleFactor, shrinkToFitScaleFactor);
}
void PrintContext::spoolPage(GraphicsContext& ctx, int pageNumber, float width)
{
if (!frame())
return;
auto& frame = *this->frame();
if (!frame.view())
return;
// FIXME: Not correct for vertical text.
IntRect pageRect = m_pageRects[pageNumber];
float scale = width / pageRect.width();
ctx.save();
ctx.scale(scale);
ctx.translate(-pageRect.x(), -pageRect.y());
ctx.clip(pageRect);
frame.view()->paintContents(ctx, pageRect);
outputLinkedDestinations(ctx, *frame.document(), pageRect);
ctx.restore();
}
void PrintContext::spoolRect(GraphicsContext& ctx, const IntRect& rect)
{
if (!frame())
return;
auto& frame = *this->frame();
if (!frame.view())
return;
// FIXME: Not correct for vertical text.
ctx.save();
ctx.translate(-rect.x(), -rect.y());
ctx.clip(rect);
frame.view()->paintContents(ctx, rect);
outputLinkedDestinations(ctx, *frame.document(), rect);
ctx.restore();
}
void PrintContext::end()
{
if (!frame())
return;
auto& frame = *this->frame();
ASSERT(m_isPrinting);
m_isPrinting = false;
frame.setPrinting(false, FloatSize(), FloatSize(), 0, AdjustViewSize);
m_linkedDestinations = nullptr;
}
static inline RenderBoxModelObject* enclosingBoxModelObject(RenderElement* renderer)
{
while (renderer && !is<RenderBoxModelObject>(*renderer))
renderer = renderer->parent();
return downcast<RenderBoxModelObject>(renderer);
}
int PrintContext::pageNumberForElement(Element* element, const FloatSize& pageSizeInPixels)
{
// Make sure the element is not freed during the layout.
RefPtr<Element> elementRef(element);
element->document().updateLayout();
auto* box = enclosingBoxModelObject(element->renderer());
if (!box)
return -1;
Frame* frame = element->document().frame();
FloatRect pageRect(FloatPoint(0, 0), pageSizeInPixels);
PrintContext printContext(frame);
printContext.begin(pageRect.width(), pageRect.height());
FloatSize scaledPageSize = pageSizeInPixels;
scaledPageSize.scale(frame->view()->contentsSize().width() / pageRect.width());
printContext.computePageRectsWithPageSize(scaledPageSize, false);
int top = roundToInt(box->offsetTop());
int left = roundToInt(box->offsetLeft());
size_t pageNumber = 0;
for (; pageNumber < printContext.pageCount(); pageNumber++) {
const IntRect& page = printContext.pageRect(pageNumber);
if (page.x() <= left && left < page.maxX() && page.y() <= top && top < page.maxY())
return pageNumber;
}
return -1;
}
void PrintContext::collectLinkedDestinations(Document& document)
{
for (Element* child = document.documentElement(); child; child = ElementTraversal::next(*child)) {
String outAnchorName;
if (Element* element = child->findAnchorElementForLink(outAnchorName))
m_linkedDestinations->add(outAnchorName, *element);
}
}
void PrintContext::outputLinkedDestinations(GraphicsContext& graphicsContext, Document& document, const IntRect& pageRect)
{
if (!graphicsContext.supportsInternalLinks())
return;
if (!m_linkedDestinations) {
m_linkedDestinations = makeUnique<HashMap<String, Ref<Element>>>();
collectLinkedDestinations(document);
}
for (const auto& it : *m_linkedDestinations) {
RenderElement* renderer = it.value->renderer();
if (!renderer)
continue;
FloatPoint point = renderer->absoluteAnchorRect().minXMinYCorner();
point = point.expandedTo(FloatPoint());
if (!pageRect.contains(roundedIntPoint(point)))
continue;
graphicsContext.addDestinationAtPoint(it.key, point);
}
}
String PrintContext::pageProperty(Frame* frame, const char* propertyName, int pageNumber)
{
ASSERT(frame);
ASSERT(frame->document());
Ref<Frame> protectedFrame(*frame);
auto& document = *frame->document();
PrintContext printContext(frame);
printContext.begin(800); // Any width is OK here.
document.updateLayout();
auto style = document.styleScope().resolver().styleForPage(pageNumber);
// Implement formatters for properties we care about.
if (!strcmp(propertyName, "margin-left")) {
if (style->marginLeft().isAuto())
return "auto"_s;
return String::number(style->marginLeft().value());
}
if (!strcmp(propertyName, "line-height"))
return String::number(style->lineHeight().value());
if (!strcmp(propertyName, "font-size"))
return String::number(style->fontDescription().computedPixelSize());
if (!strcmp(propertyName, "font-family"))
return style->fontDescription().firstFamily();
if (!strcmp(propertyName, "size"))
return makeString(style->pageSize().width.value(), ' ', style->pageSize().height.value());
return makeString("pageProperty() unimplemented for: ", propertyName);
}
bool PrintContext::isPageBoxVisible(Frame* frame, int pageNumber)
{
return frame->document()->isPageBoxVisible(pageNumber);
}
String PrintContext::pageSizeAndMarginsInPixels(Frame* frame, int pageNumber, int width, int height, int marginTop, int marginRight, int marginBottom, int marginLeft)
{
IntSize pageSize(width, height);
frame->document()->pageSizeAndMarginsInPixels(pageNumber, pageSize, marginTop, marginRight, marginBottom, marginLeft);
return makeString('(', pageSize.width(), ", ", pageSize.height(), ") ", marginTop, ' ', marginRight, ' ', marginBottom, ' ', marginLeft);
}
bool PrintContext::beginAndComputePageRectsWithPageSize(Frame& frame, const FloatSize& pageSizeInPixels)
{
if (!frame.document() || !frame.view() || !frame.document()->renderView())
return false;
frame.document()->updateLayout();
begin(pageSizeInPixels.width(), pageSizeInPixels.height());
// Account for shrink-to-fit.
FloatSize scaledPageSize = pageSizeInPixels;
scaledPageSize.scale(frame.view()->contentsSize().width() / pageSizeInPixels.width());
computePageRectsWithPageSize(scaledPageSize, false);
return true;
}
int PrintContext::numberOfPages(Frame& frame, const FloatSize& pageSizeInPixels)
{
Ref<Frame> protectedFrame(frame);
PrintContext printContext(&frame);
if (!printContext.beginAndComputePageRectsWithPageSize(frame, pageSizeInPixels))
return -1;
return printContext.pageCount();
}
void PrintContext::spoolAllPagesWithBoundaries(Frame& frame, GraphicsContext& graphicsContext, const FloatSize& pageSizeInPixels)
{
Ref<Frame> protectedFrame(frame);
PrintContext printContext(&frame);
if (!printContext.beginAndComputePageRectsWithPageSize(frame, pageSizeInPixels))
return;
const float pageWidth = pageSizeInPixels.width();
const Vector<IntRect>& pageRects = printContext.pageRects();
int totalHeight = pageRects.size() * (pageSizeInPixels.height() + 1) - 1;
// Fill the whole background by white.
graphicsContext.setFillColor(Color::white);
graphicsContext.fillRect(FloatRect(0, 0, pageWidth, totalHeight));
graphicsContext.save();
int currentHeight = 0;
for (size_t pageIndex = 0; pageIndex < pageRects.size(); pageIndex++) {
// Draw a line for a page boundary if this isn't the first page.
if (pageIndex > 0) {
#if PLATFORM(COCOA)
int boundaryLineY = currentHeight;
#else
int boundaryLineY = currentHeight - 1;
#endif
graphicsContext.save();
graphicsContext.setStrokeColor(Color::blue);
graphicsContext.setFillColor(Color::blue);
graphicsContext.drawLine(IntPoint(0, boundaryLineY), IntPoint(pageWidth, boundaryLineY));
graphicsContext.restore();
}
graphicsContext.save();
graphicsContext.translate(0, currentHeight);
printContext.spoolPage(graphicsContext, pageIndex, pageWidth);
graphicsContext.restore();
currentHeight += pageSizeInPixels.height() + 1;
}
graphicsContext.restore();
}
}