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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- Apple IIgs
- #99: Supplemental Scrap Types
-
- Revised by: Matt Deatherage March 1991
- Written by: Matt Deatherage & Matthew Reimer January 1991
-
- This Technical Note describes public scrap types.
-
- Changes since January 1991: Added the TextEdit Style Scrap type.
- _____________________________________________________________________________
-
-
- The Apple IIgs Toolbox Reference lists only two known scrap types text
- ($0000) and pictures ($0001). Other assigned scrap types are documented in
- this Note. The format used to describe the scraps is similar to that used in
- File Type Notes, where the offsets, given in the form (+xxx), determine the
- offset from the beginning of the scrap handle.
-
-
- Sampled Sound Scrap (Type: $0002)
-
- The following describes the Sampled Sound scrap format. It consists of a
- ten-byte header followed by the sample data bytes. This format is identical
- to the sampled sound resource format.
-
- Format (+000) Word This must always be zero.
- Wave Size (+002) Word Sample size in pages (256 bytes per page). For
- example, an 8K sample takes 32 pages; a 128K
- sample requires $200 pages.
- Rel Pitch (+004) Word The high byte of this word is a semitone value;
- the low byte is a fractional semitone. These
- values are used to tune the sample to correct
- pitch.
- Stereo (+006) Word The output channel for this sound is in the low
- nibble of this word.
- Sample rate (+008) Word The sampling rate of the sound, in Hertz (Hz).
- Sound (+010) Bytes The sampled sound data. The bytes are all 8-bit
- samples. The sample starts here and continues
- until the end of the scrap.
-
-
- TextEdit Style Scrap (Type: $0064)
-
- The TextEdit Style Scrap format is the same as the TEFormat structure defined
- in Volume 3 of the Apple IIgs Toolbox Reference, which is also the same as
- the rStyleBlock resource format defined in the same volume.
-
- Icon Scrap (Type: $4945)
-
- The Icon scrap format is the same as the format for Finder Icon Data records,
- documented in detail in the File Type Note for File Type $CA, Finder Icon
- Files. If there is more than one Icon Data record in a scrap, they are
- concatenated together with no intervening space.
-
-
- Mask Scrap (Type: $8001)
-
- The Mask scrap format is exactly the same as the PICT scrap ($0001) format,
- except that the pixel image the picture draws contains only zeroes and ones.
- When drawn, this picture creates a mask. The mask has zeroes where the image
- can be seen through the mask, and ones where the mask does not allow the
- picture through. When pasting a Mask scrap, initialize the destination
- bitmap to zero and draw the picture.
-
- You can create the mask image by using regular QuickDraw II calls (using
- ovals, rectangles, etc.) or you can create it independently and include it
- with PaintPixels or other pixel map manipulation routines.
-
-
- Color Table Scrap (Type: $8002)
-
- The following describes the Color Table scrap format. The scrap contains
- color tables so that applications can keep custom colors with pictures copied
- to the clipboard. The scrap has the same format as the Apple Preferred
- Format picture PALETTES block:
-
- NumColorTables (+000) Word The count of the number of color tables
- in the scrap
- ColorTableArray (+002) 32 Bytes The color tables for the scrap. There
- are NumColorTables of them, each 32 bytes
- long.
-
-
- Further Reference
- _____________________________________________________________________________
- o Apple IIgs Toolbox Reference
- o HyperCard IIgs Technical Note #3, Tuning Sampled Sounds
- o File Type Note for file type $CA, all auxiliary types, Finder Icons File
- o File Type Note for file type $C0, auxiliary type $0002, Apple Preferred
- Format
-
-
-