Routines
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56190: Print Helper Preview Image
Used by the routine at DemoEntryPoint.
Takes the generated image at Buffer_Image, and creates a preview image from it.
Level 1
helper-image-1
Print_HelperPreviewImage 56190 LD B,4 Set the initial X co-ordinate in B.
56192 LD C,22 Set the initial Y co-ordinate in C.
Print_HelperPreviewImage_0 56194 PUSH BC Stash the co-ordinates on the stack.
56195 CALL Calculate_ScreenBlockAddress Call Calculate_ScreenBlockAddress.
56198 LD B,8 Set a counter in B for 8.
Print_HelperPreviewImage_1 56200 PUSH BC Stash the counter on the stack.
56201 LD B,10 Set a counter in B for 10.
56203 PUSH HL Stash the screen buffer address pointer on the stack.
Print_HelperPreviewImage_2 56204 LD (HL),0 Write 0 to *HL.
56206 INC HL Increment the screen buffer address pointer by one.
56207 DJNZ Print_HelperPreviewImage_2 Decrease the counter by one and loop back to Print_HelperPreviewImage_2 until the counter is zero.
56209 POP HL Restore the original screen buffer address from the stack.
56210 INC H Move down one line.
56211 POP BC Restore the counter from the stack.
56212 DJNZ Print_HelperPreviewImage_1 Decrease the counter by one and loop back to Print_HelperPreviewImage_1 until the counter is zero.
56214 POP BC Restore the original co-ordinates from the stack.
56215 INC B Increment B by one.
56216 LD A,12 Jump to Print_HelperPreviewImage_0 if B is not equal to 12.
56218 CP B
56219 JR NZ,Print_HelperPreviewImage_0
56221 LD A,176 Write 176 to *56186.
56223 LD (56186),A
56226 LD A,32 Write 32 to *56187.
56228 LD (56187),A
56231 LD HL,41187 Write Buffer_Image to *56188.
56234 LD (56188),HL
56237 LD B,64 B=64.
Print_HelperPreviewImage_3 56239 PUSH BC Stash BC on the stack.
56240 LD A,(56186) H=*56186.
56243 LD H,A
56244 LD A,(56187) L=*56187.
56247 LD L,A
56248 CALL 56412 Call 56412.
56251 PUSH DE Load the screen buffer address into IX (using the stack).
56252 POP IX
56254 LD B,2 Set a counter in B for 2.
Print_HelperPreviewImage_4 56256 PUSH BC Stash the counter and the screen buffer address on the stack.
56257 PUSH IX
56259 LD HL,(56188) HL=*56188.
56262 LD B,10 B=10.
Print_HelperPreviewImage_5 56264 XOR A A=0.
56265 LD D,(HL) D=*HL.
56266 INC HL Increment HL by one.
56267 LD E,(HL) E=*HL.
56268 INC HL Increment HL by one.
56269 CALL Print_HelperPreviewImage_6 Call Print_HelperPreviewImage_6.
56272 LD D,(IX+0) D=*IX+0.
56275 OR D Set the bits from D.
56276 LD (IX+0),A Write A to *IX+0.
56279 INC IX Increment IX by one.
56281 DJNZ Print_HelperPreviewImage_5 Decrease counter by one and loop back to Print_HelperPreviewImage_5 until counter is zero.
56283 POP IX Restore IX from the stack.
56285 LD (56188),HL Write HL to *56188.
56288 POP BC Restore BC from the stack.
56289 DJNZ Print_HelperPreviewImage_4 Decrease counter by one and loop back to Print_HelperPreviewImage_4 until counter is zero.
56291 LD HL,56187 HL=56187.
56294 INC (HL) Increment *HL by one.
56295 POP BC Restore BC from the stack.
56296 DJNZ Print_HelperPreviewImage_3 Decrease counter by one and loop back to Print_HelperPreviewImage_3 until counter is zero.
56298 RET Return.
Magic.
Print_HelperPreviewImage_6 56299 RLC D Rotate D left (through the carry flag).
56301 JP NC,Print_HelperPreviewImage_7 Jump to Print_HelperPreviewImage_7 if the carry flag isn't set (if the leftmost bit was 0).
56304 OR %10000000 Set bit 7.
Print_HelperPreviewImage_7 56306 RLC D Rotate D left (through the carry flag).
56308 JP NC,Print_HelperPreviewImage_8 Jump to Print_HelperPreviewImage_8 if the carry flag isn't set (if the leftmost bit was 0).
56311 OR %10000000 Set bit 7.
Print_HelperPreviewImage_8 56313 RLC D Rotate D left (through the carry flag).
56315 JP NC,Print_HelperPreviewImage_9 Jump to Print_HelperPreviewImage_9 if the carry flag isn't set (if the leftmost bit was 0).
56318 OR %01000000 Set bit 6.
Print_HelperPreviewImage_9 56320 RLC D Rotate D left (through the carry flag).
56322 JP NC,Print_HelperPreviewImage_10 Jump to Print_HelperPreviewImage_10 if the carry flag isn't set (if the leftmost bit was 0).
56325 OR %01000000 Set bit 6.
Print_HelperPreviewImage_10 56327 RLC D Rotate D left (through the carry flag).
56329 JP NC,Print_HelperPreviewImage_11 Jump to Print_HelperPreviewImage_11 if the carry flag isn't set (if the leftmost bit was 0).
56332 OR %00100000 Set bit 5.
Print_HelperPreviewImage_11 56334 RLC D Rotate D left (through the carry flag).
56336 JP NC,Print_HelperPreviewImage_12 Jump to Print_HelperPreviewImage_12 if the carry flag isn't set (if the leftmost bit was 0).
56339 OR %00100000 Set bit 5.
Print_HelperPreviewImage_12 56341 RLC D Rotate D left (through the carry flag).
56343 JP NC,Print_HelperPreviewImage_13 Jump to Print_HelperPreviewImage_13 if the carry flag isn't set (if the leftmost bit was 0).
56346 OR %00010000 Set bit 4.
Print_HelperPreviewImage_13 56348 RLC D Rotate D left (through the carry flag).
56350 JP NC,Print_HelperPreviewImage_14 Jump to Print_HelperPreviewImage_14 if the carry flag isn't set (if the leftmost bit was 0).
56353 OR %00010000 Set bit 4.
Print_HelperPreviewImage_14 56355 RLC E Rotate E left (through the carry flag).
56357 JP NC,Print_HelperPreviewImage_15 Jump to Print_HelperPreviewImage_15 if the carry flag isn't set (if the leftmost bit was 0).
56360 OR %00001000 Set bit 3.
Print_HelperPreviewImage_15 56362 RLC E Rotate E left (through the carry flag).
56364 JP NC,Print_HelperPreviewImage_16 Jump to Print_HelperPreviewImage_16 if the carry flag isn't set (if the leftmost bit was 0).
56367 OR %00001000 Set bit 3.
Print_HelperPreviewImage_16 56369 RLC E Rotate E left (through the carry flag).
56371 JP NC,Print_HelperPreviewImage_17 Jump to Print_HelperPreviewImage_17 if the carry flag isn't set (if the leftmost bit was 0).
56374 OR %00000100 Set bit 2.
Print_HelperPreviewImage_17 56376 RLC E Rotate E left (through the carry flag).
56378 JP NC,Print_HelperPreviewImage_18 Jump to Print_HelperPreviewImage_18 if the carry flag isn't set (if the leftmost bit was 0).
56381 OR %00000100 Set bit 2.
Print_HelperPreviewImage_18 56383 RLC E Rotate E left (through the carry flag).
56385 JP NC,Print_HelperPreviewImage_19 Jump to Print_HelperPreviewImage_19 if the carry flag isn't set (if the leftmost bit was 0).
56388 OR %00000010 Set bit 1.
Print_HelperPreviewImage_19 56390 RLC E Rotate E left (through the carry flag).
56392 JP NC,Print_HelperPreviewImage_20 Jump to Print_HelperPreviewImage_20 if the carry flag isn't set (if the leftmost bit was 0).
56395 OR %00000010 Set bit 1.
Print_HelperPreviewImage_20 56397 RLC E Rotate E left (through the carry flag).
56399 JP NC,Print_HelperPreviewImage_21 Jump to Print_HelperPreviewImage_21 if the carry flag isn't set (if the leftmost bit was 0).
56402 OR %00000001 Set bit 0.
Print_HelperPreviewImage_21 56404 RLC E Rotate E left (through the carry flag).
56406 JP NC,Print_HelperPreviewImage_22 Jump to Print_HelperPreviewImage_22 if the carry flag isn't set (if the leftmost bit was 0).
56409 OR %00000001 Set bit 0.
Print_HelperPreviewImage_22 56411 RET Return.
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