Bitmap Data Source Alias Structure (IM: XG)

Inside Macintosh: QuickDraw GX Graphics /

Chapter 5 - Bitmap Shapes / Bitmap Shapes Reference

Bitmap Data Source Alias Structure
QuickDraw GX provides the bitmap data source alias structure to allow you to specify file information for disk-based pixel images.
struct gxBitmapDataSourceAlias {
   unsigned long fileOffset; 
   unsigned long aliasRecordSize; 
   unsigned char aliasRecord[gxAnyNumber]; 
};
Field Description

fileOffset
The offset in bytes from the beginning of the file to the first pixel value of the pixel image.
aliasRecordSize
The size in bytes of the alias record.
aliasRecord
A Macintosh Alias Manager alias record specifying the file containing the pixel image.
For an example of a bitmap with a disk-based pixel image, see "Creating Bitmaps With Disk-Based Pixel Images" beginning on page 5-44.