AddImageFromStream

Image handling

Description

Adds an image from a TStream to the selected document.

Once an image has been added to the document it can be drawn on any page multiple times without further increasing the size of the PDF file.

Supported image file types are: BMP, TIFF, JPEG, PNG, GIF, WMF and EMF.

For BMP and TIFF images, the CompressImages function can called before calling this function to compress the image data. Other image types are automatically compressed.

Syntax

Delphi

function TDebenuPDFLibrary1811.AddImageFromStream(InStream: TStream; 
  Options: Integer): Integer;

ActiveX

This function is not available in the ActiveX edition

DLL

This function is not available in the DLL edition

Parameters

InStream

The TStream object containing the image data. The current position in the stream will be ignored, image data will be read from position 0 in the stream.

Options

For multi-page TIFF images this parameter specifies the page number to load. For PNG images: 0 = Load the image as usual 1 = Load the alpha channel as a greyscale image 2 = Load the image and alpha channel (limit alpha to 8-bit) 3 = Load the image (limit image 8-bit/channel) 4 = Load the alpha channel (limit to 8-bit/channel) 5 = Load the image with alpha channel (limit both to 8-bit/channel) 6 = Load the image and alpha channel 7 = Load the image and ICC color profile For other image types this parameter should be set to 0. Setting Options to -1 forces TIFF, EMF and WMF images to be loaded using the GDI+ graphics library. Multipage TIFF images can also be loaded using GDI+ by setting the Options parameter to -PageNumber (for example -3 for page 3).

Return values

0	There was an error reading valid image data from the stream
Non-zero	The image was successfully added to the document. The value returned is the ID of the image which can be used with the image drawing functions such as DrawImage.