THotPDF.DecodeLoadedImageStream Method

方法摘要: THotPDF.DecodeLoadedImageStream MethodTBitmap, including supported filter and color-space processing

宣告

function DecodeLoadedImageStream(AImageStream: THPDFStreamObject): TBitmap;

HPDFDoc

名稱	用途
`AImageStream`	含有影像資料的已載入 PDF 串流物件

存放解碼後影像的點陣圖TBitmap on success or nil when the image format or geometry is unsupported

搭配已載入文件檢視工作流程傳回的串流物件使用這個 API
傳回的點陣圖實例由呼叫端負責釋放DecodeParms or DP
LZW decoding honours EarlyChange and rejects invalid dictionary transitions instead of treating compressed bytes as pixels
TIFF Predictor 2 and PNG predictors 10 through 15 are supported for complete rows with valid image geometry
Width, height, component count, bit depth, row size, and output size are checked before raster allocation
Malformed Flate, LZW, or predictor data raises its decoding exception so callers can distinguish corruption from an unsupported image format
Use ExtractLoadedImage when selecting images by the index returned from loaded-image enumeration