96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
extern char scale_trans_color;
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extern int scale_error_term;
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extern int scale_initial_pixel_count;
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extern int scale_adj_up;
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extern int scale_adj_down;
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extern int scale_final_pixel_count;
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extern int scale_ydelta_minus_1;
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extern int scale_whole_step;
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extern ubyte * scale_source_ptr;
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extern ubyte * scale_dest_ptr;
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extern void rls_stretch_scanline_asm();
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extern void scale_do_cc_scanline();
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extern void rls_do_cc_setup_asm();
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#ifdef __WATCOMC__
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void rep_stosb(char *ScreenPtr, int RunLength, int Color);
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#pragma aux rep_stosb = \
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" rep stosb" \
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parm [EDI] [ECX] [EAX]\
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modify [];
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// esi, edi = source, dest
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// ecx = width
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// ebx = u
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// edx = du
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void scale_row_asm_transparent( ubyte * sbits, ubyte * dbits, int width, fix u, fix du );
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#pragma aux scale_row_asm_transparent parm [esi] [edi] [ecx] [ebx] [edx] modify exact [edi eax ebx ecx] = \
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"newpixel: mov eax, ebx " \
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" shr eax, 16 " \
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" mov al, [esi+eax] " \
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" cmp al, 255 " \
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" je skip_it " \
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" mov [edi], al " \
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"skip_it: add ebx, edx " \
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" inc edi " \
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" dec ecx " \
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" jne newpixel "
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void scale_row_asm( ubyte * sbits, ubyte * dbits, int width, fix u, fix du );
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#pragma aux scale_row_asm parm [esi] [edi] [ecx] [ebx] [edx] modify exact [edi eax ebx ecx] = \
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"newpixel1: mov eax, ebx " \
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" shr eax, 16 " \
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" mov al, [esi+eax] " \
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" add ebx, edx " \
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" mov [edi], al " \
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" inc edi " \
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" dec ecx " \
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" jne newpixel1 "
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void rep_movsb( ubyte * sbits, ubyte * dbits, int width );
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#pragma aux rep_movsb parm [esi] [edi] [ecx] modify exact [esi edi ecx] = \
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"rep movsb"
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#else
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static inline void rep_stosb(char *ScreenPtr, int RunLength, int Color) {
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__asm__ __volatile__ ("cld; rep; stosb"
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: : "D" (ScreenPtr), "c" (RunLength), "a" (Color) : "%ecx", "%edi");
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}
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static inline void scale_row_asm_transparent( ubyte * sbits, ubyte * dbits, int width, fix u, fix du ) {
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__asm__ __volatile__ (
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"0: movl %%ebx, %%eax;"
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" shrl $16, %%eax;"
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" movb (%%esi, %%eax), %%al;"
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" cmpb $255, %%al;"
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" je 1f;"
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" movb %%al, (%%edi);"
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"1: addl %%edx, %%ebx;"
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" incl %%edi;"
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" decl %%ecx;"
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" jne 0b"
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: : "S" (sbits), "D" (dbits), "c" (width), "b" (u), "d" (du)
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: "%eax", "%ebx", "%ecx", "%edi");
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}
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static inline void scale_row_asm( ubyte * sbits, ubyte * dbits, int width, fix u, fix du ) {
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__asm__ __volatile__ (
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"0: movl %%ebx,%%eax;"
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" shrl $16, %%eax;"
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" movb (%%esi, %%eax), %%al;"
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" addl %%edx, %%ebx;"
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" movb %%al, (%%edi);"
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" incl %%edi;"
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" decl %%ecx;"
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" jne 0b"
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: : "S" (sbits), "D" (dbits), "c" (width), "b" (u), "d" (du)
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: "%eax", "%ebx", "%ecx", "%edi");
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}
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static inline void rep_movsb( ubyte * sbits, ubyte * dbits, int width ) {
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__asm__ __volatile__ ("cld; rep; movsb"
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: : "S" (sbits), "D" (dbits), "c" (width) : "%ecx", "%esi", "%edi");
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}
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#endif
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