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Annotation of hatari/src/convert/vdi16.c, revision 1.1.1.4

1.1.1.2   root        1: /* Screen Conversion, VDI Res to 16Colour */
1.1       root        2: 
1.1.1.3   root        3: static void ConvertVDIRes_16Colour(void)
1.1       root        4: {
1.1.1.2   root        5:   Uint32 *edi, *ebp;
                      6:   Uint32 *esi;
                      7:   Uint32 eax, edx;
1.1.1.3   root        8:   Uint32 ebx, ecx;
                      9:   int y, x;
1.1.1.2   root       10: 
                     11:   edx = eax = 0;
                     12: 
                     13:   /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen,
                     14:    * 'esi'-PC screen */
                     15:   
                     16:   edi = (Uint32 *)pSTScreen;        /* ST format screen 4-plane 16 colours */
                     17:   ebp = (Uint32 *)pSTScreenCopy;    /* Previous ST format screen */
                     18: 
1.1.1.3   root       19:   for (y = 0; y < VDIHeight; y++) {
                     20: 
1.1.1.2   root       21:     esi = (Uint32 *)pPCScreenDest;   /* PC format screen, byte per pixel 256 colours */
                     22: 
1.1.1.3   root       23:     x = VDIWidth >> 4;           /* Amount to draw across - in 16-pixels (8 bytes) */
1.1.1.2   root       24: 
                     25:     do          /* x-loop */
                     26:     {
                     27:       /* Do 16 pixels at one time */
                     28:       ebx = *edi;
                     29:       ecx = *(edi+1);
                     30: 
                     31:       /* Full update? or just test changes? */
                     32:       if((ScrUpdateFlag&0xe0000000) || ebx!=*ebp || ecx!=*(ebp+1))  /* Does differ? */
                     33:       {
                     34:         bScreenContentsChanged = TRUE;
                     35: 
                     36: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
                     37:         /* Plot pixels */
                     38:         LOW_BUILD_PIXELS_0 ;      /* Generate 'ecx' as pixels [4,5,6,7] */
                     39:         PLOT_LOW_320_8BIT(3) ;
                     40:         LOW_BUILD_PIXELS_1 ;      /* Generate 'ecx' as pixels [12,13,14,15] */
                     41:         PLOT_LOW_320_8BIT(1) ;
                     42:         LOW_BUILD_PIXELS_2 ;      /* Generate 'ecx' as pixels [0,1,2,3] */
                     43:         PLOT_LOW_320_8BIT(2) ;
                     44:         LOW_BUILD_PIXELS_3 ;      /* Generate 'ecx' as pixels [8,9,10,11] */
                     45:         PLOT_LOW_320_8BIT(0) ;
                     46: #else
                     47:         /* Plot pixels */
                     48:         LOW_BUILD_PIXELS_0 ;      /* Generate 'ecx' as pixels [4,5,6,7] */
                     49:         PLOT_LOW_320_8BIT(1) ;
                     50:         LOW_BUILD_PIXELS_1 ;      /* Generate 'ecx' as pixels [12,13,14,15] */
                     51:         PLOT_LOW_320_8BIT(3) ;
                     52:         LOW_BUILD_PIXELS_2 ;      /* Generate 'ecx' as pixels [0,1,2,3] */
                     53:         PLOT_LOW_320_8BIT(0) ;
                     54:         LOW_BUILD_PIXELS_3 ;      /* Generate 'ecx' as pixels [8,9,10,11] */
                     55:         PLOT_LOW_320_8BIT(2) ;
                     56: #endif
                     57:       }
                     58: 
                     59:       esi += 4;                         /* Next PC pixels */
                     60:       edi += 2;                         /* Next ST pixels */
                     61:       ebp += 2;                         /* Next ST copy pixels */
                     62:     }
1.1.1.3   root       63:     while( --x );                    /* Loop on X */
1.1       root       64: 
1.1.1.3   root       65:     /* Offset to next line */
1.1.1.4 ! root       66:     pPCScreenDest = (((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine);
1.1       root       67:   }
                     68: }
1.1.1.2   root       69: 

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