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/*
* 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 "config.h"
#include "PrintContext.h"
#include "GraphicsContext.h"
#include "Frame.h"
#include "FrameView.h"
#include "RenderView.h"
using namespace WebCore;
namespace WebCore {
PrintContext::PrintContext(Frame* frame)
: m_frame(frame)
{
}
PrintContext::~PrintContext()
{
m_pageRects.clear();
}
int PrintContext::pageCount() const
{
return m_pageRects.size();
}
const IntRect& PrintContext::pageRect(int pageNumber) const
{
return m_pageRects[pageNumber];
}
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()->renderer())
return;
RenderView* root = toRenderView(m_frame->document()->renderer());
if (!root) {
LOG_ERROR("document to be printed has no renderer");
return;
}
float ratio = printRect.height() / printRect.width();
float pageWidth = (float)root->rightLayoutOverflow();
float pageHeight = pageWidth * ratio;
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;
}
computePageRectsWithPageSize(FloatSize(pageWidth, pageHeight), userScaleFactor);
}
void PrintContext::computePageRectsWithPageSize(const FloatSize& pageSizeInPixels, float userScaleFactor)
{
RenderView* root = toRenderView(m_frame->document()->renderer());
if (!root) {
LOG_ERROR("document to be printed has no renderer");
return;
}
if (userScaleFactor <= 0) {
LOG_ERROR("userScaleFactor has bad value %.2f", userScaleFactor);
return;
}
float currPageHeight = pageSizeInPixels.height() / userScaleFactor;
float docHeight = root->layer()->height();
float currPageWidth = pageSizeInPixels.width() / userScaleFactor;
// always return at least one page, since empty files should print a blank page
float printedPagesHeight = 0;
do {
float proposedBottom = std::min(docHeight, printedPagesHeight + pageSizeInPixels.height());
m_frame->view()->adjustPageHeight(&proposedBottom, printedPagesHeight, proposedBottom, printedPagesHeight);
currPageHeight = max(1.0f, proposedBottom - printedPagesHeight);
m_pageRects.append(IntRect(0, (int)printedPagesHeight, (int)currPageWidth, (int)currPageHeight));
printedPagesHeight += currPageHeight;
} while (printedPagesHeight < docHeight);
}
void PrintContext::begin(float width)
{
// By imaging to a width a little wider than the available pixels,
// thin pages will be scaled down a little, matching the way they
// print in IE and Camino. This lets them use fewer sheets than they
// would otherwise, which is presumably why other browsers do this.
// Wide pages will be scaled down more than this.
const float PrintingMinimumShrinkFactor = 1.25f;
// 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)
const float PrintingMaximumShrinkFactor = 2.0f;
float minLayoutWidth = width * PrintingMinimumShrinkFactor;
float maxLayoutWidth = width * PrintingMaximumShrinkFactor;
// FIXME: This will modify the rendering of the on-screen frame.
// Could lead to flicker during printing.
m_frame->setPrinting(true, minLayoutWidth, maxLayoutWidth, true);
}
void PrintContext::spoolPage(GraphicsContext& ctx, int pageNumber, float width)
{
IntRect pageRect = m_pageRects[pageNumber];
float scale = width / pageRect.width();
ctx.save();
ctx.scale(FloatSize(scale, scale));
ctx.translate(-pageRect.x(), -pageRect.y());
ctx.clip(pageRect);
m_frame->view()->paintContents(&ctx, pageRect);
ctx.restore();
}
void PrintContext::end()
{
m_frame->setPrinting(false, 0, 0, true);
}
static RenderBoxModelObject* enclosingBoxModelObject(RenderObject* object)
{
while (object && !object->isBoxModelObject())
object = object->parent();
if (!object)
return 0;
return toRenderBoxModelObject(object);
}
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();
RenderBoxModelObject* 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());
printContext.computePageRectsWithPageSize(pageSizeInPixels, 1);
int top = box->offsetTop();
int left = box->offsetLeft();
int pageNumber = 0;
for (; pageNumber < printContext.pageCount(); pageNumber++) {
const IntRect& page = printContext.pageRect(pageNumber);
if (page.x() <= left && left < page.right() && page.y() <= top && top < page.bottom())
break;
}
printContext.end();
return (pageNumber < printContext.pageCount() ? pageNumber : -1);
}
int PrintContext::numberOfPages(Frame* frame, const FloatSize& pageSizeInPixels)
{
frame->document()->updateLayout();
FloatRect pageRect(FloatPoint(0, 0), pageSizeInPixels);
PrintContext printContext(frame);
printContext.begin(pageRect.width());
printContext.computePageRectsWithPageSize(pageSizeInPixels, 1);
printContext.end();
return printContext.pageCount();
}
}
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