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Annotation of hatari/src/convert/vdi4.c, revision 1.1.1.6

1.1.1.5   root        1: /*
                      2:   Hatari - vdi4.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 4 colors
                      8: */
1.1       root        9: 
                     10: 
1.1.1.3   root       11: static void ConvertVDIRes_4Colour(void)
1.1       root       12: {
1.1.1.5   root       13:        Uint32 *edi, *ebp;
                     14:        Uint32 *esi;
                     15:        Uint32 eax, ebx, ecx;
                     16:        int y, x, update;
1.1.1.2   root       17: 
1.1.1.5   root       18:        /* Get screen addresses, 'edi'-ST screen, 'ebp'-Previous ST screen, 'esi'-PC screen */
                     19:        edi = (Uint32 *)pSTScreen;          /* ST format screen 2-plane 4 colors */
                     20:        ebp = (Uint32 *)pSTScreenCopy;      /* Previous ST format screen */
                     21:        update = ScrUpdateFlag & PALETTEMASK_UPDATEMASK;
1.1.1.2   root       22: 
1.1.1.5   root       23:        for (y = 0; y < VDIHeight; y++)
                     24:        {
1.1.1.3   root       25: 
1.1.1.5   root       26:                esi = (Uint32 *)pPCScreenDest;  /* PC format screen, byte per pixel 256 colors */
1.1.1.2   root       27: 
1.1.1.5   root       28:                x = VDIWidth >> 4;              /* Amount to draw across - in 16-pixels (4 bytes) */
1.1.1.2   root       29: 
1.1.1.5   root       30:                do  /* x-loop */
                     31:                {
                     32:                        /* Do 16 pixels at one time */
                     33:                        ebx = *edi;
1.1.1.2   root       34: 
1.1.1.5   root       35:                        if (update || ebx != *ebp)  /* Update? */
                     36:                        {
1.1.1.6 ! root       37:                                bScreenContentsChanged = true;
1.1.1.2   root       38: 
1.1.1.5   root       39:                                /* Plot pixels */
1.1.1.2   root       40: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.5   root       41:                                MED_BUILD_PIXELS_0 ;    /* Generate 'ecx' as pixels [4,5,6,7] */
                     42:                                PLOT_MED_640_8BIT(3) ;
                     43:                                MED_BUILD_PIXELS_1 ;    /* Generate 'ecx' as pixels [12,13,14,15] */
                     44:                                PLOT_MED_640_8BIT(1) ;
                     45:                                MED_BUILD_PIXELS_2 ;    /* Generate 'ecx' as pixels [0,1,2,3] */
                     46:                                PLOT_MED_640_8BIT(2) ;
                     47:                                MED_BUILD_PIXELS_3 ;    /* Generate 'ecx' as pixels [8,9,10,11] */
                     48:                                PLOT_MED_640_8BIT(0) ;
1.1.1.2   root       49: #else
1.1.1.5   root       50:                                MED_BUILD_PIXELS_0 ;    /* Generate 'ecx' as pixels [4,5,6,7] */
                     51:                                PLOT_MED_640_8BIT(1) ;
                     52:                                MED_BUILD_PIXELS_1 ;    /* Generate 'ecx' as pixels [12,13,14,15] */
                     53:                                PLOT_MED_640_8BIT(3) ;
                     54:                                MED_BUILD_PIXELS_2 ;    /* Generate 'ecx' as pixels [0,1,2,3] */
                     55:                                PLOT_MED_640_8BIT(0) ;
                     56:                                MED_BUILD_PIXELS_3 ;    /* Generate 'ecx' as pixels [8,9,10,11] */
                     57:                                PLOT_MED_640_8BIT(2) ;
1.1.1.2   root       58: #endif
1.1.1.5   root       59:                        }
1.1.1.2   root       60: 
1.1.1.5   root       61:                        esi += 4;                   /* Next PC pixels */
                     62:                        edi += 1;                   /* Next ST pixels */
                     63:                        ebp += 1;                   /* Next ST copy pixels */
                     64:                }
                     65:                while (--x);                    /* Loop on X */
                     66: 
                     67:                /* Offset to next line */
                     68:                pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine);
                     69:        }
1.1       root       70: }

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