The HP rule that images be GLOADed on the same display and with the same write-enable mask that was used when the image was GSTOREd applies to HTBasic as well. In particular, don’t think that you can GSTORE on an HP BASIC display and GLOAD on an HTBasic display.
HTBasic GLOAD and GSTORE have been enhanced with the capabilities of HP BASIC’s BLOAD and BSTORE subprograms. These capabilities allow rectangular blocks of the screen to be stored or loaded. The following subprograms can be used in place of the BLOAD and BSTORE subprograms for users that want to continue calling BLOAD/BSTORE instead of switching to the GLOAD/GSTORE syntax:
10 SUB Bstore(INTEGER Array(*),W,H,OPTIONAL Rule,REAL X,Y)
20 SELECT NPAR
30 CASE 3
40 GSTORE CRT,Array(*),W,H
50 CASE 4
60 GSTORE CRT,Array(*),W,H,Rule
70 CASE 5
80 WHERE X0,Y0
90 GSTORE CRT,Array(*),W,H,Rule,X,Y0
100 CASE 6
110 GSTORE CRT,Array(*),W,H,Rule,X,Y
120 END SELECT
130 SUBEND
140 SUB Bload(INTEGER Array(*),W,H,OPTIONAL Rule,REAL X,Y)
150 SELECT NPAR
160 CASE 3
170 GLOAD CRT,Array(*),W,H
180 CASE 4
190 GLOAD CRT,Array(*),W,H,Rule
200 CASE 5
210 WHERE X0,Y0
220 GLOAD CRT,Array(*),W,H,Rule,X,Y0
230 CASE 6
240 GLOAD CRT,Array(*),W,H,Rule,X,Y
250 END SELECT
260 SUBEND
Note that only rule 3, replace, is currently supported.
