169 lines
2.7 KiB
NASM
169 lines
2.7 KiB
NASM
; CTV!
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bits 32
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section .text
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;extern "C" int blur_bitmap_16
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; (unsigned char *dest,int len);
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global blur_bitmap_16
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global test_ctv
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times ($$-$) & 3 db 0
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blur_bitmap_16:
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push edi ; point to screen
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push edx ; temporary for unwrapping
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push ecx ; count
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push ebx ; last pixel
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; ax = current pixel
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xor ebx,ebx ; Last pixel
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mov edi,[esp+20] ; edi is a pointer to the bitmap
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mov ecx,[esp+24] ; ecx is the amount of pixels to blur
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blur16_loop:
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mov ax,word[edi]
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mov dx,ax
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and ax,0x07e0
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and dx,0xf81f
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rol eax,16
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mov ax,dx
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; Now we have unwrapped the green middle out of eax
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mov edx,eax ; ebx=this pixel (unwrapped) before we changed it
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add eax,ebx ; add last pixel to this one
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mov ebx,edx ; ebx=this pixel for next time
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sar eax,1
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; wrap up again
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mov edx,eax
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ror edx,16
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and dx,0x07e0
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and ax,0xf81f
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or ax,dx
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;finished pixel in ax
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;mov word[edi],ax
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;add edi,2
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stosw
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loop blur16_loop
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pop ebx
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pop ecx
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pop edx
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pop edi
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xor eax,eax
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ret
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; --------------------------------------
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bits 32
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section .text
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;extern "C" int blur_bitmap_15
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; (unsigned char *dest,int len);
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global blur_bitmap_15
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times ($$-$) & 3 db 0
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blur_bitmap_15:
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push edi ; point to screen
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push edx ; temporary for unwrapping
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push ecx ; count
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push ebx ; last pixel
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; ax = current pixel
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xor ebx,ebx ; Last pixel
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mov edi,[esp+20] ; edi is a pointer to the bitmap
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mov ecx,[esp+24] ; ecx is the amount of pixels to blur
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blur15_loop:
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mov ax,word[edi]
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mov dx,ax
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and ax,0x03e0
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and dx,0x7c1f
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rol eax,16
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mov ax,dx
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; Now we have unwrapped the green middle out of eax
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mov edx,eax ; ebx=this pixel (unwrapped) before we changed it
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add eax,ebx ; add last pixel to this one
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mov ebx,edx ; ebx=this pixel for next time
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sar eax,1
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; wrap up again
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mov edx,eax
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ror edx,16
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and dx,0x03e0
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and ax,0x7c1f
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or ax,dx
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;finished pixel in ax
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;mov word[edi],ax
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;add edi,2
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stosw
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loop blur15_loop
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pop ebx
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pop ecx
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pop edx
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pop edi
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xor eax,eax
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ret
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; ----------------------------
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bits 32
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section .text
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;extern "C" int test_ctv
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; (unsigned char *dest,int len);
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global _test_ctv
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times ($$-$) & 3 db 0
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test_ctv:
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push edi ; point to screen
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push edx ; temporary for unwrapping
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push ecx ; count
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push ebx ; last pixel
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; ax = current pixel
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xor ebx,ebx ; Last pixel
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mov edi,[esp+20] ; edi is a pointer to the bitmap
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mov ecx,[esp+24] ; ecx is the amount of pixels to blur
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test_loop:
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mov ax,word[edi]
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mov dx,ax
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rol eax,16
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mov ax,dx
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mov edx,eax ; ebx=this pixel (unwrapped) before we changed it
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mov ebx,edx ; ebx=this pixel for next time
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sar eax,1
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mov edx,eax
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ror edx,16
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;finished pixel in ax
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;mov word[edi],ax
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;add edi,2
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stosw
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loop test_loop
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pop ebx
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pop ecx
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pop edx
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pop edi
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xor eax,eax
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ret
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%ifdef NASM_STACK_NOEXEC
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section .note.GNU-stack noalloc noexec nowrite progbits
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%endif
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