static void ConvertMediumRes_640x16Bit(void)
{
Uint32 *edi, *ebp;
Uint16 *esi;
Uint32 eax;
int y;
Convert_StartFrame(); /* Start frame, track palettes */
for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++)
{
eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */
ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
esi = (Uint16 *)pPCScreenDest; /* PC format screen */
if (AdjustLinePaletteRemap(y) & 0x00030000) /* Change palette table */
Line_ConvertMediumRes_640x16Bit(edi, ebp, esi, eax);
else
Line_ConvertLowRes_640x16Bit(edi, ebp, (Uint32 *)esi, eax);
/* Offset to next line */
pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine * 2);
}
}
static void ConvertLowRes_320x32Bit(void)
{
Uint32 *edi, *ebp;
Uint32 *esi;
Uint32 eax, edx;
Uint32 ebx, ecx;
int y, x, update;
Convert_StartFrame(); /* Start frame, track palettes */
for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++)
{
eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */
ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
esi = (Uint32 *)pPCScreenDest; /* PC format screen */
update = AdjustLinePaletteRemap(y) & PALETTEMASK_UPDATEMASK;
x = STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels (8 bytes) */
do /* x-loop */
{
/* Do 16 pixels at one time */
ebx = *edi;
ecx = *(edi+1);
if (update || ebx!=*ebp || ecx!=*(ebp+1)) /* Does differ? */
{
/* copy word */
bScreenContentsChanged = true;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
/* Plot pixels */
LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [12,13,14,15] */
PLOT_LOW_320_32BIT(12) ;
LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
PLOT_LOW_320_32BIT(4) ;
LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
PLOT_LOW_320_32BIT(8) ;
LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
PLOT_LOW_320_32BIT(0) ;
#else
/* Plot pixels */
LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
PLOT_LOW_320_32BIT(4) ;
LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
PLOT_LOW_320_32BIT(12) ;
LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
PLOT_LOW_320_32BIT(0) ;
LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
PLOT_LOW_320_32BIT(8) ;
#endif
}
esi += 16; /* Next PC pixels */
edi += 2; /* Next ST pixels */
ebp += 2; /* Next ST copy pixels */
}
while (--x); /* Loop on X */
/* Offset to next line: */
pPCScreenDest = (((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine);
}
}