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Annotation of hatari/src/convert/low320x16.c, revision 1.1.1.5

1.1.1.2   root        1: /* Screen Conversion, Low Res to 320x16Bit */
1.1       root        2: 
1.1.1.4   root        3: static void ConvertLowRes_320x16Bit(void)
1.1       root        4: {
1.1.1.2   root        5:  Uint32 *edi, *ebp;
                      6:  Uint16 *esi;
1.1.1.3   root        7:  Uint32 eax, edx;
1.1.1.4   root        8:  Uint32 ebx, ecx;
                      9:  int y, x;
1.1       root       10: 
1.1.1.2   root       11:  Convert_StartFrame();            /* Start frame, track palettes */
1.1       root       12: 
1.1.1.4   root       13:  for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) {
                     14: 
                     15:    eax = STScreenLineOffset[y] + STScreenLeftSkipBytes;  /* Offset for this line + Amount to skip on left hand side */
1.1.1.2   root       16:    edi = (Uint32 *)((Uint8 *)pSTScreen + eax);        /* ST format screen 4-plane 16 colours */
                     17:    ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax);    /* Previous ST format screen */
1.1.1.3   root       18:    esi = (Uint16 *)pPCScreenDest;                     /* PC format screen */
1.1       root       19: 
1.1.1.4   root       20:    AdjustLinePaletteRemap(y);
1.1       root       21:  
1.1.1.4   root       22:    x = STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels(8 bytes) */
1.1       root       23: 
                     24:    do    /* x-loop */
                     25:     {
                     26:      /* Do 16 pixels at one time */
                     27:      ebx=*edi;
                     28:      ecx=*(edi+1);
                     29: 
1.1.1.3   root       30:      if( (ScrUpdateFlag&0xe0000000) || ebx!=*ebp || ecx!=*(ebp+1) )     /* Does differ? */
                     31:       { /* copy word */
1.1       root       32: 
                     33:        bScreenContentsChanged=TRUE;
                     34:    
1.1.1.2   root       35: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1       root       36:        /* Plot pixels */
                     37:        LOW_BUILD_PIXELS_0 ;      /* Generate 'ecx' as pixels [4,5,6,7] */
                     38:        PLOT_LOW_320_16BIT(12) ;
                     39:        LOW_BUILD_PIXELS_1 ;      /* Generate 'ecx' as pixels [12,13,14,15] */
                     40:        PLOT_LOW_320_16BIT(4) ;
                     41:        LOW_BUILD_PIXELS_2 ;      /* Generate 'ecx' as pixels [0,1,2,3] */
                     42:        PLOT_LOW_320_16BIT(8) ;
                     43:        LOW_BUILD_PIXELS_3 ;      /* Generate 'ecx' as pixels [8,9,10,11] */
                     44:        PLOT_LOW_320_16BIT(0) ;
                     45: #else
                     46:        /* Plot pixels */
                     47:        LOW_BUILD_PIXELS_0 ;      /* Generate 'ecx' as pixels [4,5,6,7] */
                     48:        PLOT_LOW_320_16BIT(4) ;
                     49:        LOW_BUILD_PIXELS_1 ;      /* Generate 'ecx' as pixels [12,13,14,15] */
                     50:        PLOT_LOW_320_16BIT(12) ;
                     51:        LOW_BUILD_PIXELS_2 ;      /* Generate 'ecx' as pixels [0,1,2,3] */
                     52:        PLOT_LOW_320_16BIT(0) ;
                     53:        LOW_BUILD_PIXELS_3 ;      /* Generate 'ecx' as pixels [8,9,10,11] */
                     54:        PLOT_LOW_320_16BIT(8) ;
                     55: #endif
                     56:       }
                     57: 
                     58:      esi += 16;                             /* Next PC pixels */
                     59:      edi += 2;                              /* Next ST pixels */
                     60:      ebp += 2;                              /* Next ST copy pixels */
                     61:     }
1.1.1.4   root       62:    while( --x );                         /* Loop on X */
1.1       root       63: 
1.1.1.5 ! root       64:    pPCScreenDest = (((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine);  /* Offset to next line */
1.1       root       65:   }
                     66: }
                     67: 

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