//------------------------------------------------------------------------------
//?
//?????Copyright?（c）?Microsoft?Corporation.??All?rights?reserved.
//?
//------------------------------------------------------------------------------

#include?“stdafx.h“
#include?“ImageRenderer.h“

///?

///?Constructor
///?

ImageRenderer::ImageRenderer（）?:?
????m_hWnd（0）
????m_sourceWidth（0）
????m_sourceHeight（0）
????m_sourceStride（0）
????m_pD2DFactory（NULL）?
????m_pRenderTarget（NULL）
????m_pBitmap（0）
{
}

///?

///?Destructor
///?

ImageRenderer::~ImageRenderer（）
{
????DiscardResources（）;
????SafeRelease（m_pD2DFactory）;
}

///?

///?Ensure?necessary?Direct2d?resources?are?created
///?

///?indicates?success?or?failure
HRESULT?ImageRenderer::EnsureResources（）
{
????HRESULT?hr?=?S_OK;

????if?（NULL?==?m_pRenderTarget）
????{
????????D2D1_SIZE_U?size?=?D2D1::SizeU（m_sourceWidth?m_sourceHeight）;

????????D2D1_RENDER_TARGET_PROPERTIES?rtProps?=?D2D1::RenderTargetProperties（）;
????????rtProps.pixelFormat?=?D2D1::PixelFormat（DXGI_FORMAT_B8G8R8A8_UNORM?D2D1_ALPHA_MODE_IGNORE）;
????????rtProps.usage?=?D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE;

????????//?Create?a?hWnd?render?target?in?order?to?render?to?the?window?set?in?initialize
????????hr?=?m_pD2DFactory->CreateHwndRenderTarget（
????????????rtProps
????????????D2D1::HwndRenderTargetProperties（m_hWnd?size）
????????????&m_pRenderTarget
????????）;

????????if?（FAILED（hr））
????????{
????????????return?hr;
????????}

????????//?Create?a?bitmap?that?we?can?copy?image?data?into?and?then?render?to?the?target
????????hr?=?m_pRenderTarget->CreateBitmap（
????????????size?
????????????D2D1::BitmapProperties（D2D1::PixelFormat（DXGI_FORMAT_B8G8R8A8_UNORM?D2D1_ALPHA_MODE_IGNORE））
????????????&m_pBitmap?
????????）;

????????if?（FAILED（hr））
????????{
????????????SafeRelease（m_pRenderTarget）;
????????????return?hr;
????????}
????}

????return?hr;
}

///?

///?Dispose?of?Direct2d?resources?
///?

void?ImageRenderer::DiscardResources（）
{
????SafeRelease（m_pRenderTarget）;
????SafeRelease（m_pBitmap）;
}

///?

///?Set?the?window?to?draw?to?as?well?as?the?video?format
///?Implied?bits?per?pixel?is?32
///?

///?window?to?draw?to
///?already?created?D2D?factory?object
///?width?（in?pixels）?of?image?data?to?be?drawn
///?height?（in?pixels）?of?image?data?to?be?drawn
///?length?（in?bytes）?of?a?single?scanline
///?indicates?success?or?failure
HRESULT?ImageRenderer::Initialize（HWND?hWnd?ID2D1Factory*?pD2DFactory?int?sourceWidth?int?sourceHeight?int?sourceStride）
{
????if?（NULL?==?pD2