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/*
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define _USE_MATH_DEFINES 1
#include "config.h"
#include "PDFDocumentImage.h"
#if USE(CG)
#include "GraphicsContext.h"
#include "ImageObserver.h"
#include "SharedBuffer.h"
#include <wtf/MathExtras.h>
#include <wtf/RetainPtr.h>
#if !PLATFORM(MAC)
#include "ImageSourceCG.h"
#endif
using namespace std;
namespace WebCore {
PDFDocumentImage::PDFDocumentImage()
: Image(0) // PDFs don't animate
, m_document(0)
, m_rotation(0.0f)
, m_currentPage(-1)
{
}
PDFDocumentImage::~PDFDocumentImage()
{
CGPDFDocumentRelease(m_document);
}
String PDFDocumentImage::filenameExtension() const
{
return "pdf";
}
IntSize PDFDocumentImage::size() const
{
const float sina = sinf(-m_rotation);
const float cosa = cosf(-m_rotation);
const float width = m_mediaBox.size().width();
const float height = m_mediaBox.size().height();
const float rotWidth = width * cosa - height * sina;
const float rotHeight = width * sina + height * cosa;
return IntSize((int)(fabsf(rotWidth) + 0.5f), (int)(fabsf(rotHeight) + 0.5f));
}
bool PDFDocumentImage::dataChanged(bool allDataReceived)
{
if (allDataReceived && !m_document) {
#if PLATFORM(MAC)
// On Mac the NSData inside the SharedBuffer can be secretly appended to without the SharedBuffer's knowledge. We use SharedBuffer's ability
// to wrap itself inside CFData to get around this, ensuring that ImageIO is really looking at the SharedBuffer.
RetainPtr<CFDataRef> data(AdoptCF, this->data()->createCFData());
RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get()));
#else
// Create a CGDataProvider to wrap the SharedBuffer.
// We use the GetBytesAtPosition callback rather than the GetBytePointer one because SharedBuffer
// does not provide a way to lock down the byte pointer and guarantee that it won't move, which
// is a requirement for using the GetBytePointer callback.
CGDataProviderDirectCallbacks providerCallbacks = { 0, 0, 0, sharedBufferGetBytesAtPosition, 0 };
RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateDirect(this->data(), this->data()->size(), &providerCallbacks));
#endif
m_document = CGPDFDocumentCreateWithProvider(dataProvider.get());
setCurrentPage(0);
}
return m_document; // return true if size is available
}
void PDFDocumentImage::adjustCTM(GraphicsContext* context) const
{
// rotate the crop box and calculate bounding box
float sina = sinf(-m_rotation);
float cosa = cosf(-m_rotation);
float width = m_cropBox.width();
float height = m_cropBox.height();
// calculate rotated x and y edges of the corp box. if they're negative, it means part of the image has
// been rotated outside of the bounds and we need to shift over the image so it lies inside the bounds again
CGPoint rx = CGPointMake(width * cosa, width * sina);
CGPoint ry = CGPointMake(-height * sina, height * cosa);
// adjust so we are at the crop box origin
const CGFloat zero = 0;
CGContextTranslateCTM(context->platformContext(), floorf(-min(zero, min(rx.x, ry.x))), floorf(-min(zero, min(rx.y, ry.y))));
// rotate -ve to remove rotation
CGContextRotateCTM(context->platformContext(), -m_rotation);
// shift so we are completely within media box
CGContextTranslateCTM(context->platformContext(), m_mediaBox.x() - m_cropBox.x(), m_mediaBox.y() - m_cropBox.y());
}
void PDFDocumentImage::setCurrentPage(int page)
{
if (!m_document)
return;
if (page == m_currentPage)
return;
if (!(page >= 0 && page < pageCount()))
return;
m_currentPage = page;
CGPDFPageRef cgPage = CGPDFDocumentGetPage(m_document, page + 1);
// get media box (guaranteed)
m_mediaBox = CGPDFPageGetBoxRect(cgPage, kCGPDFMediaBox);
// get crop box (not always there). if not, use media box
CGRect r = CGPDFPageGetBoxRect(cgPage, kCGPDFCropBox);
if (!CGRectIsEmpty(r))
m_cropBox = r;
else
m_cropBox = m_mediaBox;
// get page rotation angle
m_rotation = CGPDFPageGetRotationAngle(cgPage) * piFloat / 180.0f; // to radians
}
int PDFDocumentImage::pageCount() const
{
return m_document ? CGPDFDocumentGetNumberOfPages(m_document) : 0;
}
void PDFDocumentImage::draw(GraphicsContext* context, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace, CompositeOperator op)
{
if (!m_document || m_currentPage == -1)
return;
context->save();
context->setCompositeOperation(op);
float hScale = dstRect.width() / srcRect.width();
float vScale = dstRect.height() / srcRect.height();
// Scale and translate so the document is rendered in the correct location,
// including accounting for the fact that a GraphicsContext is always flipped
// and doing appropriate flipping.
CGContextTranslateCTM(context->platformContext(), dstRect.x() - srcRect.x() * hScale, dstRect.y() - srcRect.y() * vScale);
CGContextScaleCTM(context->platformContext(), hScale, vScale);
CGContextScaleCTM(context->platformContext(), 1, -1);
CGContextTranslateCTM(context->platformContext(), 0, -srcRect.height());
CGContextClipToRect(context->platformContext(), CGRectIntegral(srcRect));
// Rotate translate image into position according to doc properties.
adjustCTM(context);
CGContextTranslateCTM(context->platformContext(), -m_mediaBox.x(), -m_mediaBox.y());
CGContextDrawPDFPage(context->platformContext(), CGPDFDocumentGetPage(m_document, m_currentPage + 1));
context->restore();
if (imageObserver())
imageObserver()->didDraw(this);
}
}
#endif // USE(CG)
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