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Annotation of hatari/src/convert/vdi2.c, revision 1.1.1.3

1.1.1.2   root        1: /* Screen Conversion, VDI Res to 2Colour (1-Bit and 8-Bit) */
1.1       root        2: 
1.1.1.2   root        3: #if 0  /* Currently unused */
1.1.1.3 ! root        4: static void ConvertVDIRes_2Colour_1Bit(void)
1.1       root        5: {
1.1.1.2   root        6:   /* Copy palette to bitmap (2 colours) */
                      7: 
1.1       root        8:   if (HBLPalettes[0]==0x777) {
                      9:     ScreenBMP.Colours[0].rgbRed = ScreenBMP.Colours[0].rgbGreen = ScreenBMP.Colours[0].rgbBlue = 0xff;
                     10:     ScreenBMP.Colours[1].rgbRed = ScreenBMP.Colours[1].rgbGreen = ScreenBMP.Colours[1].rgbBlue = 0x00;
                     11:   }
                     12:   else {
                     13:     ScreenBMP.Colours[0].rgbRed = ScreenBMP.Colours[0].rgbGreen = ScreenBMP.Colours[0].rgbBlue = 0x00;
                     14:     ScreenBMP.Colours[1].rgbRed = ScreenBMP.Colours[1].rgbGreen = ScreenBMP.Colours[1].rgbBlue = 0xff;
                     15:   }
1.1.1.2   root       16: 
                     17:   /* Simply copy ST screen, as same format! */
1.1       root       18:   memcpy(pPCScreenDest,pSTScreen,(VDIWidth/8)*VDIHeight);
                     19: 
                     20:   bScreenContentsChanged = TRUE;
                     21: }
1.1.1.2   root       22: #endif
1.1       root       23: 
                     24: 
1.1.1.3 ! root       25: static void ConvertVDIRes_2Colour(void)
1.1       root       26: {
1.1.1.2   root       27:   Uint16 *edi, *ebp;
                     28:   Uint32 *esi;
1.1.1.3 ! root       29:   Uint16 eax, ebx;
        !            30:   int y, x;
1.1.1.2   root       31: 
                     32:   edi = (Uint16 *)pSTScreen;            /* ST format screen */
                     33:   ebp = (Uint16 *)pSTScreenCopy;        /* Previous ST format screen */
                     34: 
1.1.1.3 ! root       35:   for (y = 0; y < VDIHeight; y++) {
        !            36: 
1.1.1.2   root       37:     esi = (Uint32 *)pPCScreenDest;      /* PC format screen, byte per pixel 256 colours */
                     38: 
1.1.1.3 ! root       39:     x = VDIWidth >> 4;               /* Amount to draw across in 16-pixels (4 bytes) */
1.1.1.2   root       40: 
                     41:     do          /* x-loop */
                     42:     {
                     43:       /* Do 16 pixels at one time */
                     44:       ebx = *edi;
                     45: 
                     46:       if( (ScrUpdateFlag&0xe0000000) || ebx!=*ebp )  /* Does differ? */
                     47:       {
                     48:         bScreenContentsChanged = TRUE;
                     49: 
                     50: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
                     51:         /* Plot in 'right-order' on big endian systems */
                     52:         HIGH_BUILD_PIXELS_0 ;           /* Generate pixels [4,5,6,7] */
                     53:         PLOT_HIGH_640_8BIT(3) ;
                     54:         HIGH_BUILD_PIXELS_1 ;           /* Generate pixels [0,1,2,3] */
                     55:         PLOT_HIGH_640_8BIT(2) ;
                     56:         HIGH_BUILD_PIXELS_2 ;           /* Generate pixels [12,13,14,15] */
                     57:         PLOT_HIGH_640_8BIT(1) ;
                     58:         HIGH_BUILD_PIXELS_3 ;           /* Generate pixels [8,9,10,11] */
                     59:         PLOT_HIGH_640_8BIT(0) ;
                     60: #else
                     61:         /* Plot in 'wrong-order', as ebx is 68000 endian */
                     62:         HIGH_BUILD_PIXELS_0 ;           /* Generate pixels [4,5,6,7] */
                     63:         PLOT_HIGH_640_8BIT(1) ;
                     64:         HIGH_BUILD_PIXELS_1 ;           /* Generate pixels [0,1,2,3] */
                     65:         PLOT_HIGH_640_8BIT(0) ;
                     66:         HIGH_BUILD_PIXELS_2 ;           /* Generate pixels [12,13,14,15] */
                     67:         PLOT_HIGH_640_8BIT(3) ;
                     68:         HIGH_BUILD_PIXELS_3 ;           /* Generate pixels [8,9,10,11] */
                     69:         PLOT_HIGH_640_8BIT(2) ;
                     70: #endif
                     71:       }
                     72: 
                     73:       esi += 4;                         /* Next PC pixels */
                     74:       edi += 1;                         /* Next ST pixels */
                     75:       ebp += 1;                         /* Next ST copy pixels */
                     76:     }
1.1.1.3 ! root       77:     while( --x );                    /* Loop on X */
1.1       root       78: 
1.1.1.3 ! root       79:     /* Offset to next line */
        !            80:     pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine);
1.1       root       81:   }
                     82: }

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