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Annotation of hatari/src/convert/med640x8.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
        !             2:   Hatari - med640x8.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, Medium Res to 640x8Bit
        !             8: */
1.1       root        9: 
                     10: void ConvertMediumRes_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:     eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes;  /* Offset for this line + Amount to skip on left hand side */
        !            22:     edi = (Uint32 *)((Uint8 *)pSTScreen + eax);       /* ST format screen 4-plane 16 colours */
        !            23:     ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax);   /* Previous ST format screen */
        !            24:     esi = (Uint32 *)pPCScreenDest;                    /* PC format screen */
        !            25: 
        !            26:     if((AdjustLinePaletteRemap()&0x00030000) == 0)    /* Change palette table */
        !            27:       Line_ConvertLowRes_640x8Bit(edi, ebp, esi, eax);
        !            28:     else
        !            29:       Line_ConvertMediumRes_640x8Bit(edi, ebp, esi, eax);
        !            30: 
        !            31:     pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2);  /* Offset to next line */
        !            32:     ScrY += 1;
1.1       root       33:   }
1.1.1.2 ! root       34:   while(ScrY < STScreenEndHorizLine);                 /* Loop on Y */
1.1       root       35: }
1.1.1.2 ! root       36: 
        !            37: 
        !            38: void Line_ConvertMediumRes_640x8Bit(Uint32 *edi, Uint32 *ebp, Uint32 *esi, Uint32 eax)
1.1       root       39: {
1.1.1.2 ! root       40:   register Uint32 ebx, ecx;
        !            41: 
        !            42:   ScrX = STScreenWidthBytes>>2;   /* Amount to draw across in 16-pixels (4 bytes) */
1.1       root       43: 
1.1.1.2 ! root       44:   do    /* x-loop */
        !            45:   {
        !            46: 
        !            47:     /* Do 16 pixels at one time */
        !            48:     ebx = *edi;
        !            49: 
        !            50:     if((ScrUpdateFlag&0xe0000000) || ebx!=*ebp)       /* Does differ? */
        !            51:     {  /* copy word */
        !            52: 
        !            53:       bScreenContentsChanged = TRUE;
        !            54: 
        !            55: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
        !            56:       /* Plot in 'right-order' on big endian systems */
        !            57:       if(!bScrDoubleY)                  /* Double on Y? */
        !            58:       {
        !            59:         MED_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            60:         PLOT_MED_640_8BIT(3) ;
        !            61:         MED_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            62:         PLOT_MED_640_8BIT(1) ;
        !            63:         MED_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            64:         PLOT_MED_640_8BIT(2) ;
        !            65:         MED_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            66:         PLOT_MED_640_8BIT(0) ;
        !            67:       }
        !            68:       else
        !            69:       {
        !            70:         MED_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            71:         PLOT_MED_640_8BIT_DOUBLE_Y(3) ;
        !            72:         MED_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            73:         PLOT_MED_640_8BIT_DOUBLE_Y(1) ;
        !            74:         MED_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            75:         PLOT_MED_640_8BIT_DOUBLE_Y(2) ;
        !            76:         MED_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            77:         PLOT_MED_640_8BIT_DOUBLE_Y(0) ;
        !            78:       }
        !            79: #else
        !            80:       /* Plot in 'wrong-order', as ebx is 68000 endian */
        !            81:       if(!bScrDoubleY)                  /* Double on Y? */
        !            82:       {
        !            83:         MED_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            84:         PLOT_MED_640_8BIT(1) ;
        !            85:         MED_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            86:         PLOT_MED_640_8BIT(3) ;
        !            87:         MED_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            88:         PLOT_MED_640_8BIT(0) ;
        !            89:         MED_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !            90:         PLOT_MED_640_8BIT(2) ;
        !            91:       }
        !            92:       else
        !            93:       {
        !            94:         MED_BUILD_PIXELS_0 ;            /* Generate 'ecx' as pixels [4,5,6,7] */
        !            95:         PLOT_MED_640_8BIT_DOUBLE_Y(1) ;
        !            96:         MED_BUILD_PIXELS_1 ;            /* Generate 'ecx' as pixels [12,13,14,15] */
        !            97:         PLOT_MED_640_8BIT_DOUBLE_Y(3) ;
        !            98:         MED_BUILD_PIXELS_2 ;            /* Generate 'ecx' as pixels [0,1,2,3] */
        !            99:         PLOT_MED_640_8BIT_DOUBLE_Y(0) ;
        !           100:         MED_BUILD_PIXELS_3 ;            /* Generate 'ecx' as pixels [8,9,10,11] */
        !           101:         PLOT_MED_640_8BIT_DOUBLE_Y(2) ;
        !           102:       }
        !           103: #endif
        !           104:     }
        !           105: 
        !           106:     esi += 4;                           /* Next PC pixels */
        !           107:     edi += 1;                           /* Next ST pixels */
        !           108:     ebp += 1;                           /* Next ST copy pixels */
        !           109:   
1.1       root      110:   }
1.1.1.2 ! root      111:   while(--ScrX);                        /* Loop on X */
1.1       root      112: }
1.1.1.2 ! root      113: 

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