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@ -153,36 +153,10 @@ draw-narrow-grapheme-on-screen-buffer: # buffer: (addr byte), letter-bitmap: (a
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# if (ycurr >= ymax) break
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39/compare %edx 7/r32/edi
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0f 8d/jump-if->= break/disp32
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# var xcurr/eax: int = x*8 + 7
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8b/-> *(ebp+0x10) 0/r32/eax
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c1 4/subop/shift-left %eax 3/imm8 # font-width
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05/add-to-eax 7/imm32 # font-width - 1
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# var xmin/ecx: int = x*8
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8b/-> *(ebp+0x10) 1/r32/ecx
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c1 4/subop/shift-left %ecx 3/imm8
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# var row-bitmap/ebx: int = *letter-bitmap
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# var row-bitmap/ebx: byte = *letter-bitmap
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bb/copy-to-ebx 0/imm32
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8a/byte-> *esi 3/r32/BL
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{
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# if (xcurr < xmin) break
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39/compare %eax 1/r32/ecx
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7c/jump-if-< break/disp8
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# shift LSB from row-bitmap into carry flag (CF)
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c1 5/subop/shift-right-logical %ebx 1/imm8
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# if LSB, draw a pixel in the given color
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{
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73/jump-if-not-CF break/disp8
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(pixel-on-screen-buffer *(ebp+8) %eax %edx *(ebp+0x18) *(ebp+0x20) *(ebp+0x24))
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eb/jump $draw-grapheme-on-screen-buffer:continue/disp8
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}
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# otherwise use the background color
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(pixel-on-screen-buffer *(ebp+8) %eax %edx *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24))
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$draw-grapheme-on-screen-buffer:continue:
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# --x
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48/decrement-eax
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#
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eb/jump loop/disp8
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}
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(draw-run-of-pixels-from-glyph *(ebp+8) %ebx *(ebp+0x10) %edx *(ebp+0x18) *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24))
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# ++y
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42/increment-edx
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# next bitmap row
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@ -228,6 +202,54 @@ $draw-wide-grapheme-on-screen-buffer:end:
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5d/pop-to-ebp
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c3/return
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# draw 8 pixels from a single glyph byte in a font bitmap
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draw-run-of-pixels-from-glyph: # buffer: (addr byte), glyph-byte: byte, x: int, y: int, color: int, background-color: int, screen-width: int, screen-height: int
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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56/push-esi
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# esi = glyph-byte
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8b/-> *(ebp+0xc) 6/r32/esi
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# var xcurr/eax: int = x*8 + 7
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8b/-> *(ebp+0x10) 0/r32/eax
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c1 4/subop/shift-left %eax 3/imm8
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05/add-to-eax 7/imm32
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# var xmin/ecx: int = x*8
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8b/-> *(ebp+0x10) 1/r32/ecx
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c1 4/subop/shift-left %ecx 3/imm8
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{
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# if (xcurr < xmin) break
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39/compare %eax 1/r32/ecx
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7c/jump-if-< break/disp8
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# shift LSB from row-bitmap into carry flag (CF)
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c1 5/subop/shift-right-logical %esi 1/imm8
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# if LSB, draw a pixel in the given color
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{
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73/jump-if-not-CF break/disp8
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(pixel-on-screen-buffer *(ebp+8) %eax *(ebp+0x14) *(ebp+0x18) *(ebp+0x20) *(ebp+0x24))
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eb/jump $draw-grapheme-on-screen-buffer:continue/disp8
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}
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# otherwise use the background color
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(pixel-on-screen-buffer *(ebp+8) %eax *(ebp+0x14) *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24))
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$draw-grapheme-on-screen-buffer:continue:
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# --x
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48/decrement-eax
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#
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eb/jump loop/disp8
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}
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$draw-run-of-pixels-from-glyph:end:
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# . restore registers
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5e/pop-to-esi
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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c3/return
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cursor-position-on-real-screen: # -> _/eax: int, _/ecx: int
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# . prologue
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55/push-ebp
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