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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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#include "precompiled_sd.hxx"

#include "SlideRenderer.hxx"
#include "sdpage.hxx"
#include <toolkit/helper/vclunohelper.hxx>
#include <vos/mutex.hxx>
#include <vcl/svapp.hxx>
#include <cppcanvas/vclfactory.hxx>

using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
using ::rtl::OUString;

namespace sd { namespace presenter {

//===== Service ===============================================================

Reference<XInterface> SAL_CALL SlideRenderer_createInstance (
	const Reference<XComponentContext>& rxContext)
{
	return Reference<XInterface>(static_cast<XWeak*>(new SlideRenderer(rxContext)));
}


::rtl::OUString SlideRenderer_getImplementationName (void) throw(RuntimeException)
{
	return OUString::createFromAscii("com.sun.star.comp.Draw.SlideRenderer");
}


Sequence<rtl::OUString> SAL_CALL SlideRenderer_getSupportedServiceNames (void)
	throw (RuntimeException)
{
	static const ::rtl::OUString sServiceName(
		::rtl::OUString::createFromAscii("com.sun.star.drawing.SlideRenderer"));
	return Sequence<rtl::OUString>(&sServiceName, 1);
}


//===== SlideRenderer ==========================================================

SlideRenderer::SlideRenderer (const Reference<XComponentContext>& rxContext)
	: SlideRendererInterfaceBase(m_aMutex),
	  maPreviewRenderer()
{
	(void)rxContext;
}


SlideRenderer::~SlideRenderer (void)
{
}


void SAL_CALL SlideRenderer::disposing (void)
{
}


//----- XInitialization -------------------------------------------------------

void SAL_CALL SlideRenderer::initialize (const Sequence<Any>& rArguments)
	throw (Exception, RuntimeException)
{
	ThrowIfDisposed();

	if (rArguments.getLength() == 0)
	{
		try
		{
		}
		catch (RuntimeException&)
		{
			throw;
		}
	}
	else
	{
		throw RuntimeException(
			OUString::createFromAscii("SlideRenderer: invalid number of arguments"),
				static_cast<XWeak*>(this));
	}
}


//----- XSlideRenderer --------------------------------------------------------

Reference<awt::XBitmap> SlideRenderer::createPreview (
	const Reference<drawing::XDrawPage>& rxSlide,
	const awt::Size& rMaximalSize,
	sal_Int16 nSuperSampleFactor)
	throw (css::uno::RuntimeException)
{
	ThrowIfDisposed();
	::vos::OGuard aGuard (Application::GetSolarMutex());

	return VCLUnoHelper::CreateBitmap(
		CreatePreview(rxSlide, rMaximalSize, nSuperSampleFactor));
}


Reference<rendering::XBitmap> SlideRenderer::createPreviewForCanvas (
	const Reference<drawing::XDrawPage>& rxSlide,
	const awt::Size& rMaximalSize,
	sal_Int16 nSuperSampleFactor,
	const Reference<rendering::XCanvas>& rxCanvas)
	throw (css::uno::RuntimeException)
{
	ThrowIfDisposed();
	::vos::OGuard aGuard (Application::GetSolarMutex());

	cppcanvas::BitmapCanvasSharedPtr pCanvas (cppcanvas::VCLFactory::getInstance().createCanvas(
		Reference<rendering::XBitmapCanvas>(rxCanvas, UNO_QUERY)));
	if (pCanvas.get() != NULL)
		return cppcanvas::VCLFactory::getInstance().createBitmap(
			pCanvas,
			CreatePreview(rxSlide, rMaximalSize, nSuperSampleFactor))->getUNOBitmap();
	else
		return NULL;
}


awt::Size SAL_CALL SlideRenderer::calculatePreviewSize (
	double nSlideAspectRatio,
	const awt::Size& rMaximalSize)
	throw (css::uno::RuntimeException)
{
	if (rMaximalSize.Width <= 0
		|| rMaximalSize.Height <= 0
		|| nSlideAspectRatio <= 0)
	{
		return awt::Size(0,0);
	}

	const double nWindowAspectRatio (double(rMaximalSize.Width) / double(rMaximalSize.Height));
	if (nSlideAspectRatio < nWindowAspectRatio)
		return awt::Size(
			sal::static_int_cast<sal_Int32>(rMaximalSize.Height * nSlideAspectRatio),
			rMaximalSize.Height);
	else
		return awt::Size(
			rMaximalSize.Width,
			sal::static_int_cast<sal_Int32>(rMaximalSize.Width / nSlideAspectRatio));
}


//-----------------------------------------------------------------------------

BitmapEx SlideRenderer::CreatePreview (
	const Reference<drawing::XDrawPage>& rxSlide,
	const awt::Size& rMaximalSize,
	sal_Int16 nSuperSampleFactor)
	throw (css::uno::RuntimeException)
{
	const SdPage* pPage = SdPage::getImplementation(rxSlide);
	if (pPage == NULL)
		throw lang::IllegalArgumentException(
			OUString::createFromAscii("SlideRenderer::createPreview() called with invalid slide"),
			static_cast<XWeak*>(this),
			0);

	// Determine the size of the current slide and its aspect ratio.
	Size aPageSize = pPage->GetSize();
	if (aPageSize.Height() <= 0)
		throw lang::IllegalArgumentException(
			OUString::createFromAscii("SlideRenderer::createPreview() called with invalid size"),
			static_cast<XWeak*>(this),
			1);

	// Compare with the aspect ratio of the window (which rMaximalSize
	// assumed to be) and calculate the size of the preview so that it
	// a) will have the aspect ratio of the page and
	// b) will be as large as possible.
	awt::Size aPreviewSize (calculatePreviewSize(
		double(aPageSize.Width()) / double(aPageSize.Height()),
		rMaximalSize));
	if (aPreviewSize.Width <= 0 || aPreviewSize.Height <= 0)
		return BitmapEx();

	// Make sure that the super sample factor has a sane value.
	sal_Int16 nFactor (nSuperSampleFactor);
	if (nFactor < 1)
		nFactor = 1;
	else if (nFactor > 10)
		nFactor = 10;

	// Create the preview. When the super sample factor n is greater than 1
	// then a preview is created in size (n*width, n*height) and then scaled
	// down to (width, height). This is a poor mans antialiasing for the
	// time being. When we have true antialiasing support this workaround
	// can be removed.
	const Image aPreview = maPreviewRenderer.RenderPage (
		pPage,
		Size(aPreviewSize.Width*nFactor, aPreviewSize.Height*nFactor),
		::rtl::OUString());
	if (nFactor == 1)
		return aPreview.GetBitmapEx();
	else
	{
		BitmapEx aScaledPreview = aPreview.GetBitmapEx();
		aScaledPreview.Scale(
			Size(aPreviewSize.Width,aPreviewSize.Height),
			BMP_SCALE_FASTESTINTERPOLATE);
		return aScaledPreview;
	}
}


void SlideRenderer::ThrowIfDisposed (void)
	throw (::com::sun::star::lang::DisposedException)
{
	if (SlideRendererInterfaceBase::rBHelper.bDisposed || SlideRendererInterfaceBase::rBHelper.bInDispose)
	{
		throw lang::DisposedException (
			::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM(
				 "SlideRenderer object has already been disposed")),
			static_cast<uno::XWeak*>(this));
	}
}


} } // end of namespace ::sd::presenter

/* vim: set noet sw=4 ts=4: */