为IWicBitmap创建wic位图呈现目标

Question

我已经使用内存中的数据创建了一个IWicBitmap

hr=pFactory->CreateBitmapFromMemory(512,512,GUID_WICPixelFormat8bppGray,512,512*512,ptr,&Bitmap1)

现在我想在位图上绘图，所以我创建了bitmaprendertarget。

hr= m_pDirect2dFactory->CreateWicBitmapRenderTarget(Bitmap1,props,&target);

但它不会形成目标--它会返回一个错误：

-2003292288

我不知道如何解决这个问题，我还设置了属性。

D2D1_RENDER_TARGET_PROPERTIES props = D2D1::RenderTargetProperties();
props.minLevel = D2D1_FEATURE_LEVEL_DEFAULT;
D2D1_PIXEL_FORMAT pixelFormat = D2D1::PixelFormat(DXGI_FORMAT_UNKNOWN,D2D1_ALPHA_MODE_IGNORE);
props.pixelFormat=pixelFormat;

Answer 1

我自己也犯了这个错误。错误代码-2003292288实际上是WINCODEC_ERR_UNSUPPORTEDPIXELFORMAT (0x88982F80)。CreateWicBitmapRenderTarget方法不接受所有WIC的像素格式。

我在Windows7和8.1机器上的实验表明，该方法似乎接受以下WIC像素格式(如您所见，没有灰色格式)：

8bpp Alpha (GUID_WICPixelFormat8bppAlpha)
 Guid: e6cd0116-eeba-4161-aa85-27dd9fb3a895
 Bits Per Pixel: 8
 Supports Transparency: True
 Numeric Representation: UnsignedInteger
 Channel Count: 1

32bpp BGR (GUID_WICPixelFormat32bppBGR)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc90e
 Bits Per Pixel: 32
 Supports Transparency: False
 Numeric Representation: UnsignedInteger
 Channel Count: 3

32bpp RGB (GUID_WICPixelFormat32bppRGB)
 (Requires Windows 8 or Windows 7 with Platform Update)
 Guid: d98c6b95-3efe-47d6-bb25-eb1748ab0cf1
 Bits Per Pixel: 32
 Supports Transparency: False
 Numeric Representation: UnsignedInteger
 Channel Count: 3

32bpp pBGRA (GUID_WICPixelFormat32bppPBGRA)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc910
 Bits Per Pixel: 32
 Supports Transparency: True
 Numeric Representation: UnsignedInteger
 Channel Count: 4

32bpp pRGBA (GUID_WICPixelFormat32bppPRGBA)
 Guid: 3cc4a650-a527-4d37-a916-3142c7ebedba
 Bits Per Pixel: 32
 Supports Transparency: True
 Numeric Representation: UnsignedInteger
 Channel Count: 4

64bpp RGB (GUID_WICPixelFormat64bppRGB)
 Guid: a1182111-186d-4d42-bc6a-9c8303a8dff9
 Bits Per Pixel: 64
 Supports Transparency: False
 Numeric Representation: UnsignedInteger
 Channel Count: 3

64bpp pRGBA (GUID_WICPixelFormat64bppPRGBA)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc917
 Bits Per Pixel: 64
 Supports Transparency: True
 Numeric Representation: UnsignedInteger
 Channel Count: 4

64bpp pRGBA half (GUID_WICPixelFormat64bppPRGBAHalf)
 Guid: 58ad26c2-c623-4d9d-b320-387e49f8c442
 Bits Per Pixel: 64
 Supports Transparency: True
 Numeric Representation: Float
 Channel Count: 4

64bpp RGB half (GUID_WICPixelFormat64bppRGBHalf)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc942
 Bits Per Pixel: 64
 Supports Transparency: False
 Numeric Representation: Float
 Channel Count: 3

128bpp pRGBA float (GUID_WICPixelFormat128bppPRGBAFloat)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc91a
 Bits Per Pixel: 128
 Supports Transparency: True
 Numeric Representation: Float
 Channel Count: 4

128bpp RGB float (GUID_WICPixelFormat128bppRGBFloat)
 Guid: 6fddc324-4e03-4bfe-b185-3d77768dc91b
 Bits Per Pixel: 128
 Supports Transparency: False
 Numeric Representation: Float
 Channel Count: 3