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> Main > rgb 8bit, rgb 16bit, rgb 24bit, rgb 32bit formats |
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jdawg 21 Oct 2005, 22:36
Actually don't use this one yet. I tried to rewrite it from memory. give me a day or two and I'll post the rgb16bit555 the rgb16bit565 the rgb24bit and rgb32bit(8 bit alpha mode). I can't remember how many spaces to shift left on the previous one, give me until tomorrow and I'll have all the correct posts.
IN OTHER WORDS MY BAD! |
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21 Oct 2005, 22:36 |
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Matrix 21 Oct 2005, 23:58
you are really right, there are not much info about this hanging around,
so i share these little codes with you i wrote before, hope one might find them useful, they meant to be fast-small Code: ; A - Alpha R - Red G - Green B - Blue ;8-bit could be, depends on how you set up the palett: ;RRGGGBBB - 233 ;RRRGGBBB - 323 ;RRRGGGBB - 332 ;RRGGGBB - 232 +1 reserved ;16-bit is RRRRRRGGGGGGBBBBB - 565 ;24-bit is RRRRRRRRGGGGGGGGBBBBBBBB - 888 ;32-bit is AAAAAAAARRRRRRRRGGGGGGGGBBBBBBBB - 8888 mix16bitcolor: ; ah=Red al=Green bl=Blue returns:ax=16bit 565 color shl al,2 shl ax,3 ; where 5 bit=32, 6 bit=64 ! or al,bl ret mix16bitcolor3: ; al=Red bl=Green cl=Blue returns:ax=16bit 565 color shl ax,6 ; where 5 bit=32, 6 bit=64 ! or al,bl shl ax,5 or al,cl ret mix16bitcolor8: ; ah=Red al=Green bl=Blue returns:ax=16bit 888 (565) color shr ah,3 shr ax,2 shl ax,5 shr bl,3 or al,bl ret get16bitrgb: ; ax=16bit 565 color returns:ah=Red al=Green bl=Blue mov bl,al ; where 5 bit=32, 6 bit=64 ! and bl,11111b shr ax,3 shl ah,2 shr ax,2 ret get16bitrgb3: ; ax=16bit 565 color returns:al=Red bl=Green cl=Blue mov cl,al ; where 5 bit=32, 6 bit=64 ! and cl,11111b shr ax,5 mov bl,al and bl,111111b shr ax,6 ret get16bitrgb8: ; ax=16bit 888 (565) color returns:ah=Red al=Green bl=Blue mov bl,al shl bl,3 shr ax,5 shl ax,2 shl ah,3 ret mix24bitcolor: ; ah=Red al=Green bl=Blue returns:eax=24bit 888 color shl eax,8 or al,bl ret get24bitrgb: ; eax=24bit 888 color returns:ah=Red al=Green bl=Blue mov bl,al shr eax,8 ret mix32bitcolor: ; ah=Alpha al=Red bh=Green bl=Blue returns:eax=32bit 8888 color shl eax,16 or ax,bx ret get32bitrgb: ; eax=32bit 888 color returns:ah=Alpha al=Red bh=Green bl=Blue mov bx,ax shr eax,16 ret |
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21 Oct 2005, 23:58 |
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Hayden 24 Oct 2005, 01:22
I asume your codeing for DOS since DX has all the macros you need for this.
Anyway it is best to use the VESA func 4F01h int 10h to return the alignment for the RGB palette. (some cards are 5:5:5 and others are 5:6:5). func 4F01h returns all the info about a mode in a low DOS user buffer es:di. All you need to do is SHL each channel by the facter given in the mode info buffer and OR them together. func 4F01h also returns a mask size for each channel so you can easily create color masks. for VESA func 4F01h structure info visit www.vesa.org and download vbe30.pdf. p.s. I'm currently porting a VBE library I wrote in Euphoria to FASM but this is currently on the back burner since I have other priorities. good luck, have fun. _________________ New User.. Hayden McKay. |
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24 Oct 2005, 01:22 |
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jdawg 24 Oct 2005, 23:08
Thanks for adding guys, and sorry I took so long but here are the working macros I said I would post.
;~~This macro builds a 16bit RGB 5.5.5 format color value (1 bit alpha mode) macro rgb16bit555 r,g,b { mov eax,b mov ebx,31 and eax,ebx mov ecx,g mov ebx,31 and ecx,ebx shl ecx,5 add eax,ecx mov ecx,r mov ebx,31 and ecx,ebx shl ecx,10 add eax,ecx } ;~~This macro build a 16bit rgb 5.6.5 color value (green dominant mode) macro rgb16bit565 r,g,b { mov eax,b mov ebx,31 and eax,ebx mov ecx,g mov ebx,63 and ecx,ebx shl ecx,5 add eax,ecx mov ecx,r mov ebx,31 and ecx,ebx shl ecx,11 add eax,ecx } ;~~This macro builds a 24bit 8.8.8 format color value (ignored alpha mode?) macro rgb24bit a,r,g,b { mov eax,b mov ecx,g shl ecx,8 add eax,ecx mov ecx,r shl ecx,16 add eax,ecx } ;~~This macro builds a 32bit A.8.8.8 format color value (8 bit alpha mode) macro rgb32bitA8 a,r,g,b { mov eax,b mov ecx,g shl ecx,8 add eax,ecx mov ecx,r shl ecx,16 add eax,ecx mov ecx,a shl ecx,24 add eax,ecx } |
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24 Oct 2005, 23:08 |
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uri 28 Oct 2005, 12:31
Code: macro rgb16bit555 r,g,b { mov eax, (b and 0x1F) or ((g and 0x1F) shl 5) or ((r and 0x1F) shl 10) } |
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28 Oct 2005, 12:31 |
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