| /* |
| * Copyright (C) 2007 Alp Toker <alp@atoker.com> |
| * Copyright (C) 2007 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 "core/page/PrintContext.h" |
| |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/layout/LayoutView.h" |
| #include "platform/graphics/GraphicsContext.h" |
| |
| namespace blink { |
| |
| // By shrinking to a width of 75% (1.333f) we will render the correct physical |
| // dimensions in paged media (i.e. cm, pt,). The shrinkage used |
| // to be 80% (1.25f) to match other browsers - they have since moved on. |
| // Wide pages will be scaled down more than this. |
| const float printingMinimumShrinkFactor = 1.333f; |
| |
| // This number determines how small we are willing to reduce the page content |
| // in order to accommodate the widest line. If the page would have to be |
| // reduced smaller to make the widest line fit, we just clip instead (this |
| // behavior matches MacIE and Mozilla, at least). |
| // TODO(rhogan): Decide if this quirk is still required. |
| const float printingMaximumShrinkFactor = 2; |
| |
| PrintContext::PrintContext(LocalFrame* frame) |
| : m_frame(frame) |
| , m_isPrinting(false) |
| , m_linkedDestinationsValid(false) |
| { |
| } |
| |
| PrintContext::~PrintContext() |
| { |
| if (m_isPrinting) |
| end(); |
| } |
| |
| void PrintContext::computePageRects(const FloatRect& printRect, float headerHeight, float footerHeight, float userScaleFactor, float& outPageHeight) |
| { |
| m_pageRects.clear(); |
| outPageHeight = 0; |
| |
| if (!m_frame->document() || !m_frame->view() || !m_frame->document()->layoutView()) |
| return; |
| |
| if (userScaleFactor <= 0) { |
| DLOG(ERROR) << "userScaleFactor has bad value " << userScaleFactor; |
| return; |
| } |
| |
| LayoutView* view = m_frame->document()->layoutView(); |
| const IntRect& documentRect = view->documentRect(); |
| FloatSize pageSize = m_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) { |
| DLOG(ERROR) << "pageHeight has bad value " << pageHeight; |
| return; |
| } |
| |
| computePageRectsWithPageSizeInternal(FloatSize(pageWidth / userScaleFactor, pageHeight / userScaleFactor)); |
| } |
| |
| void PrintContext::computePageRectsWithPageSize(const FloatSize& pageSizeInPixels) |
| { |
| m_pageRects.clear(); |
| computePageRectsWithPageSizeInternal(pageSizeInPixels); |
| } |
| |
| void PrintContext::computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels) |
| { |
| if (!m_frame->document() || !m_frame->view() || !m_frame->document()->layoutView()) |
| return; |
| |
| LayoutView* view = m_frame->document()->layoutView(); |
| |
| IntRect docRect = view->documentRect(); |
| |
| int pageWidth = pageSizeInPixels.width(); |
| // We scaled with floating point arithmetic and need to ensure results like 13329.99 |
| // are treated as 13330 so that we don't mistakenly assign an extra page for the |
| // stray pixel. |
| int pageHeight = pageSizeInPixels.height() + LayoutUnit::epsilon(); |
| |
| 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; |
| |
| 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) |
| { |
| ASSERT(width > 0); |
| ASSERT(height > 0); |
| |
| // 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 = m_frame->resizePageRectsKeepingRatio(originalPageSize, FloatSize(width * printingMinimumShrinkFactor, height * printingMinimumShrinkFactor)); |
| |
| // This changes layout, so callers need to make sure that they don't paint to screen while in printing mode. |
| m_frame->setPrinting(true, minLayoutSize, originalPageSize, printingMaximumShrinkFactor / printingMinimumShrinkFactor); |
| } |
| |
| void PrintContext::end() |
| { |
| ASSERT(m_isPrinting); |
| m_isPrinting = false; |
| m_frame->setPrinting(false, FloatSize(), FloatSize(), 0); |
| m_linkedDestinations.clear(); |
| m_linkedDestinationsValid = false; |
| } |
| |
| static LayoutBoxModelObject* enclosingBoxModelObject(LayoutObject* object) |
| { |
| |
| while (object && !object->isBoxModelObject()) |
| object = object->parent(); |
| if (!object) |
| return nullptr; |
| return toLayoutBoxModelObject(object); |
| } |
| |
| int PrintContext::pageNumberForElement(Element* element, const FloatSize& pageSizeInPixels) |
| { |
| // Make sure the element is not freed during the layout. |
| RefPtrWillBeRawPtr<Element> protect(element); |
| element->document().updateLayout(); |
| |
| LayoutBoxModelObject* box = enclosingBoxModelObject(element->layoutObject()); |
| if (!box) |
| return -1; |
| |
| LocalFrame* 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); |
| |
| int top = box->pixelSnappedOffsetTop(); |
| int left = box->pixelSnappedOffsetLeft(); |
| 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(Node* node) |
| { |
| for (Node* i = node->firstChild(); i; i = i->nextSibling()) |
| collectLinkedDestinations(i); |
| |
| if (!node->isLink() || !node->isElementNode()) |
| return; |
| const AtomicString& href = toElement(node)->getAttribute(HTMLNames::hrefAttr); |
| if (href.isNull()) |
| return; |
| KURL url = node->document().completeURL(href); |
| if (!url.isValid()) |
| return; |
| |
| if (url.hasFragmentIdentifier() && equalIgnoringFragmentIdentifier(url, node->document().baseURL())) { |
| String name = url.fragmentIdentifier(); |
| if (Element* element = node->document().findAnchor(name)) |
| m_linkedDestinations.set(name, element); |
| } |
| } |
| |
| void PrintContext::outputLinkedDestinations(GraphicsContext& context, const IntRect& pageRect) |
| { |
| if (!m_linkedDestinationsValid) { |
| // Collect anchors in the top-level frame only because our PrintContext |
| // supports only one namespace for the anchors. |
| collectLinkedDestinations(frame()->document()); |
| m_linkedDestinationsValid = true; |
| } |
| |
| for (const auto& entry : m_linkedDestinations) { |
| LayoutObject* layoutObject = entry.value->layoutObject(); |
| if (!layoutObject || !layoutObject->frameView()) |
| continue; |
| IntRect boundingBox = layoutObject->absoluteBoundingBoxRect(); |
| // TODO(bokan): boundingBox looks to be in content coordinates but |
| // convertToRootFrame doesn't apply scroll offsets when converting up to |
| // the root frame. |
| IntPoint point = layoutObject->frameView()->convertToRootFrame(boundingBox.location()); |
| if (!pageRect.contains(point)) |
| continue; |
| point.clampNegativeToZero(); |
| context.setURLDestinationLocation(entry.key, point); |
| } |
| } |
| |
| String PrintContext::pageProperty(LocalFrame* frame, const char* propertyName, int pageNumber) |
| { |
| Document* document = frame->document(); |
| PrintContext printContext(frame); |
| // Any non-zero size is OK here. We don't care about actual layout. We just want to collect |
| // @page rules and figure out what declarations apply on a given page (that may or may not exist). |
| printContext.begin(800, 1000); |
| RefPtr<ComputedStyle> style = document->styleForPage(pageNumber); |
| |
| // Implement formatters for properties we care about. |
| if (!strcmp(propertyName, "margin-left")) { |
| if (style->marginLeft().isAuto()) |
| return String("auto"); |
| 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->getFontDescription().computedPixelSize()); |
| if (!strcmp(propertyName, "font-family")) |
| return style->getFontDescription().family().family().getString(); |
| if (!strcmp(propertyName, "size")) |
| return String::number(style->pageSize().width()) + ' ' + String::number(style->pageSize().height()); |
| |
| return String("pageProperty() unimplemented for: ") + propertyName; |
| } |
| |
| bool PrintContext::isPageBoxVisible(LocalFrame* frame, int pageNumber) |
| { |
| return frame->document()->isPageBoxVisible(pageNumber); |
| } |
| |
| String PrintContext::pageSizeAndMarginsInPixels(LocalFrame* 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 "(" + String::number(pageSize.width()) + ", " + String::number(pageSize.height()) + ") " + |
| String::number(marginTop) + ' ' + String::number(marginRight) + ' ' + String::number(marginBottom) + ' ' + String::number(marginLeft); |
| } |
| |
| int PrintContext::numberOfPages(LocalFrame* frame, const FloatSize& pageSizeInPixels) |
| { |
| frame->document()->updateLayout(); |
| |
| FloatRect pageRect(FloatPoint(0, 0), pageSizeInPixels); |
| PrintContext printContext(frame); |
| printContext.begin(pageRect.width(), pageRect.height()); |
| // Account for shrink-to-fit. |
| FloatSize scaledPageSize = pageSizeInPixels; |
| scaledPageSize.scale(frame->view()->contentsSize().width() / pageRect.width()); |
| printContext.computePageRectsWithPageSize(scaledPageSize); |
| return printContext.pageCount(); |
| } |
| |
| DEFINE_TRACE(PrintContext) |
| { |
| #if ENABLE(OILPAN) |
| visitor->trace(m_frame); |
| visitor->trace(m_linkedDestinations); |
| #endif |
| } |
| |
| } // namespace blink |