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Annotation of hatari/src/convert/vdi16.c, revision 1.1.1.6

1.1.1.5   root        1: /*
                      2:   Hatari - vdi16.c
                      3: 
                      4:   This file is distributed under the GNU Public License, version 2 or at your
                      5:   option any later version. Read the file gpl.txt for details.
                      6: 
                      7:   Screen Conversion, VDI resolution with 16 colors
                      8: */
1.1       root        9: 
1.1.1.3   root       10: static void ConvertVDIRes_16Colour(void)
1.1       root       11: {
1.1.1.5   root       12:        Uint32 *edi, *ebp;
                     13:        Uint32 *esi;
                     14:        Uint32 eax, edx;
                     15:        Uint32 ebx, ecx;
                     16:        int y, x, update;
                     17: 
                     18:        edx = eax = 0;
                     19: 
                     20:        /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen,
                     21:         * 'esi'-PC screen */
                     22: 
                     23:        edi = (Uint32 *)pSTScreen;        /* ST format screen 4-plane 16 colors */
                     24:        ebp = (Uint32 *)pSTScreenCopy;    /* Previous ST format screen */
                     25:        update = ScrUpdateFlag & PALETTEMASK_UPDATEMASK;
                     26: 
                     27:        for (y = 0; y < VDIHeight; y++)
                     28:        {
                     29: 
                     30:                esi = (Uint32 *)pPCScreenDest;  /* PC format screen, byte per pixel 256 colors */
                     31: 
                     32:                x = VDIWidth >> 4;              /* Amount to draw across - in 16-pixels (8 bytes) */
                     33: 
                     34:                do  /* x-loop */
                     35:                {
                     36:                        /* Do 16 pixels at one time */
                     37:                        ebx = *edi;
                     38:                        ecx = *(edi+1);
                     39: 
                     40:                        /* Full update? or just test changes? */
                     41:                        if (update || ebx != *ebp || ecx != *(ebp+1))   /* Does differ? */
                     42:                        {
1.1.1.6 ! root       43:                                bScreenContentsChanged = true;
1.1.1.2   root       44: 
                     45: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.5   root       46:                                /* Plot pixels */
                     47:                                LOW_BUILD_PIXELS_0 ;    /* Generate 'ecx' as pixels [4,5,6,7] */
                     48:                                PLOT_LOW_320_8BIT(3) ;
                     49:                                LOW_BUILD_PIXELS_1 ;    /* Generate 'ecx' as pixels [12,13,14,15] */
                     50:                                PLOT_LOW_320_8BIT(1) ;
                     51:                                LOW_BUILD_PIXELS_2 ;    /* Generate 'ecx' as pixels [0,1,2,3] */
                     52:                                PLOT_LOW_320_8BIT(2) ;
                     53:                                LOW_BUILD_PIXELS_3 ;    /* Generate 'ecx' as pixels [8,9,10,11] */
                     54:                                PLOT_LOW_320_8BIT(0) ;
1.1.1.2   root       55: #else
1.1.1.5   root       56:                                /* Plot pixels */
                     57:                                LOW_BUILD_PIXELS_0 ;    /* Generate 'ecx' as pixels [4,5,6,7] */
                     58:                                PLOT_LOW_320_8BIT(1) ;
                     59:                                LOW_BUILD_PIXELS_1 ;    /* Generate 'ecx' as pixels [12,13,14,15] */
                     60:                                PLOT_LOW_320_8BIT(3) ;
                     61:                                LOW_BUILD_PIXELS_2 ;    /* Generate 'ecx' as pixels [0,1,2,3] */
                     62:                                PLOT_LOW_320_8BIT(0) ;
                     63:                                LOW_BUILD_PIXELS_3 ;    /* Generate 'ecx' as pixels [8,9,10,11] */
                     64:                                PLOT_LOW_320_8BIT(2) ;
1.1.1.2   root       65: #endif
1.1.1.5   root       66:                        }
1.1.1.2   root       67: 
1.1.1.5   root       68:                        esi += 4;                   /* Next PC pixels */
                     69:                        edi += 2;                   /* Next ST pixels */
                     70:                        ebp += 2;                   /* Next ST copy pixels */
                     71:                }
                     72:                while (--x);                    /* Loop on X */
                     73: 
                     74:                /* Offset to next line */
                     75:                pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine);
                     76:        }
1.1       root       77: }

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