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Improve the dhires plotting routine

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This commit is contained in:
Aaron Culliney
2014-05-23 08:24:25 -07:00
parent c0e4e8ab31
commit 46b6fa5342
1 changed files with 25 additions and 10 deletions
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35
src/asm386/display.S
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@@ -27,19 +27,26 @@
* ebx: dhires_colors index
* edx: scratch
* ------------------------------------------------------------------------- */
#if 1
#define PlotDHiresByte\
xorl %edx, %edx;\
movb SN(video__dhires2)(,%ebx,1), %dl;\
movb %dl, %dh;\
/*movb %dl, %dh;*/\
shll $16, %edx;\
movb SN(video__dhires1)(,%ebx,1), %dl;\
movb %dl, %dh;\
/*movb %dl, %dh;*/\
movl %edx, (%eax);\
movl %edx, SCANWIDTH(%eax);\
addl $4, %eax;
#define PlotDHiresFirstByte\
subl $4, %eax;\
PlotDHiresByte
movl %edx, SCANWIDTH(%eax);
#else
#define PlotDHiresByte\
pushal;\
pushl %eax;\
pushl %ebx;\
call _plot_dhires_pixels;\
popl %ebx;\
popl %eax;\
popal;
#endif
/* -------------------------------------------------------------------------
* Plot a full double hires color byte into GM
@@ -77,8 +84,10 @@
shrb $3, %bl; \
shlb $4, %bh; \
orb %bh, %bl; \
xorb %bh, %bh; \
PlotDHiresFirstByte \
movzbl %bl, %ebx; \
subl $4, %eax;\
PlotDHiresByte\
addl $4, %eax;\
\
plot_dhires##X##_cont: \
movl %ecx, %edx; \
@@ -106,21 +115,27 @@ plot_dhires##X##_cont: \
/* 00000001 11111122 22222333 3333xxxx */ \
\
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \
addl $4, %eax;\
shrl $4, %ecx; \
movb %cl, %bl; \
PlotDHiresByte \