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Annotation of hatari/src/convert/low640x8.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
        !             2:   Hatari - low640x8.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.
1.1       root        6: 
1.1.1.2 ! root        7:   Screen conversion function, Low Res to 640x8Bit
        !             8: */
1.1       root        9: 
                     10: void ConvertLowRes_640x8Bit(void)
                     11: {
1.1.1.2 ! root       12:   Uint32 *edi, *ebp;
        !            13:   Uint32 *esi;
        !            14:   Uint32 eax;
        !            15: 
        !            16:   Convert_StartFrame();           /* Start frame, track palettes */
        !            17:   ScrY = STScreenStartHorizLine;  /* Starting line in ST screen */
        !            18: 
        !            19:   do      /* y-loop */
        !            20:   {
        !            21:     /* Get screen addresses */
        !            22:     eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes;  /* Offset for this line + Amount to skip on left hand side */
        !            23:     edi = (Uint32 *)((Uint8 *)pSTScreen + eax);       /* ST format screen 4-plane 16 colours */
        !            24:     ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax);   /* Previous ST format screen */
        !            25:     esi = (Uint32 *)pPCScreenDest;                    /* PC format screen */
        !            26: 
        !            27:     AdjustLinePaletteRemap();
        !            28: 
        !            29:     if((AdjustLinePaletteRemap()&0x00030000) == 0)    /* Change palette table */
        !            30:       Line_ConvertLowRes_640x8Bit(edi, ebp, esi, eax);
        !            31:     else
        !            32:       Line_ConvertMediumRes_640x8Bit(edi, ebp, esi, eax);
1.1       root       33: 
1.1.1.2 ! root       34:     pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2);  /* Offset to next line */
        !            35:     ScrY += 1;
1.1       root       36:   }
1.1.1.2 ! root       37:   while(ScrY < STScreenEndHorizLine);                 /* Loop on Y */
1.1       root       38: }
1.1.1.2 ! root       39: 
        !            40: 
        !            41: void Line_ConvertLowRes_640x8Bit(Uint32 *edi, Uint32 *ebp, Uint32 *esi, Uint32 eax)
1.1       root       42: {
1.1.1.2 ! root       43:   Uint32 edx;
        !            44:   register Uint32 ebx, ecx, ebpp;
1.1       root       45: 
1.1.1.2 ! root       46:   ScrX = STScreenWidthBytes>>3;         /* Amount to draw across in 16-pixels (8 bytes) */
        !            47: 
        !            48:   do    /* x-loop */
        !            49:   {
        !            50:     /* Do 16 pixels at one time */
        !            51:     ebx = *edi;
        !            52:     ecx = *(edi+1);
        !            53: 
        !            54:     if((ScrUpdateFlag&0xe0000000) || ebx!=*ebp || ecx!=*(ebp+1))  /* Does differ? */
        !            55:     { /* copy word */
        !            56: 
        !            57:       bScreenContentsChanged = TRUE;
        !            58: 
        !            59: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
        !            60:       /* Plot in 'right-order' on big endian systems */
        !            61:       if(!bScrDoubleY)                  /* Double on Y? */
        !            62:       {
        !            63:         /* Plot pixels */
        !            64:         LOW_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            65:         PLOT_LOW_640_8BIT(6) ;
        !            66:         LOW_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            67:         PLOT_LOW_640_8BIT(2) ;
        !            68:         LOW_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            69:         PLOT_LOW_640_8BIT(4) ;
        !            70:         LOW_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            71:         PLOT_LOW_640_8BIT(0) ;
        !            72:       }
        !            73:       else
        !            74:       {
        !            75:         /* Plot pixels */
        !            76:         LOW_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            77:         PLOT_LOW_640_8BIT_DOUBLE_Y(6) ;
        !            78:         LOW_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            79:         PLOT_LOW_640_8BIT_DOUBLE_Y(2) ;
        !            80:         LOW_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            81:         PLOT_LOW_640_8BIT_DOUBLE_Y(4) ;
        !            82:         LOW_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            83:         PLOT_LOW_640_8BIT_DOUBLE_Y(0)
        !            84:       }
        !            85: #else
        !            86:       /* Plot in 'wrong-order', as ebx is 68000 endian */
        !            87:       if(!bScrDoubleY)                  /* Double on Y? */
        !            88:       {
        !            89:         /* Plot pixels */
        !            90:         LOW_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            91:         PLOT_LOW_640_8BIT(2) ;
        !            92:         LOW_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            93:         PLOT_LOW_640_8BIT(6) ;
        !            94:         LOW_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            95:         PLOT_LOW_640_8BIT(0) ;
        !            96:         LOW_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            97:         PLOT_LOW_640_8BIT(4) ;
        !            98:       }
        !            99:       else
        !           100:       {
        !           101:         /* Plot pixels */
        !           102:         LOW_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !           103:         PLOT_LOW_640_8BIT_DOUBLE_Y(2) ;
        !           104:         LOW_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !           105:         PLOT_LOW_640_8BIT_DOUBLE_Y(6) ;
        !           106:         LOW_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !           107:         PLOT_LOW_640_8BIT_DOUBLE_Y(0) ;
        !           108:         LOW_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !           109:         PLOT_LOW_640_8BIT_DOUBLE_Y(4)
        !           110:       }
        !           111: #endif
        !           112: 
        !           113:     }
        !           114: 
        !           115:     esi += 8;                           /* Next PC pixels */
        !           116:     edi += 2;                           /* Next ST pixels */
        !           117:     ebp += 2;                           /* Next ST copy pixels */
1.1       root      118:   }
1.1.1.2 ! root      119:   while(--ScrX);                        /* Loop on X */
1.1       root      120: }
1.1.1.2 ! root      121: 

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