HomeLine-APut pixelArbitrary line

6.7 Get pixel

Name: »Get pixel«
Line-A number: $A002
Syntax: See 'Bindings for get_pixel'
Description: This Line-A function obtains the colour register at the specified coordinates.
Return value: The function returns in d0 the colour register at the specified coordinates.
Availability: All TOS versions.
See also: Binding   LINEA   Put Pixel

6.7.1 Bindings for get_pixel

Pure-C: int16_t get_pixel( int x, int y );
Assembler:
movem.l   D0-D2/A0-A2,-(A7)  ; Save registers
move.l    pParamblk,A0       ; Pointer parameter block LINEA
move.l    (12,A0),A1         ; Address of ptsin
move.w    x,(A1)             ; X-coordinate in ptsin[0]
move.w    y,(2,A1)           ; Y-coordinate in ptsin[1]
dc.w      $A002              ; Line-A opcode
move.w    D0,color           ; d0 contains colour
movem.l   (A7)+,D0-D2/A0-A2  ; Restore registers

HomeLine-APut pixelArbitrary line