--- hatari/src/convert/low320x16.c 2019/04/01 07:09:32 1.1.1.2 +++ hatari/src/convert/low320x16.c 2019/04/09 08:47:30 1.1.1.7 @@ -1,134 +1,76 @@ -/* Screen Conversion, Low Res to 320x16Bit */ +/* + Hatari - low320x16.c -void ConvertLowRes_320x16Bit(void) -{ - Uint32 *edi, *ebp; - Uint16 *esi; - register Uint32 eax, ebx, ecx, edx; - - edx=0; - - Convert_StartFrame(); /* Start frame, track palettes */ - ScrY = STScreenStartHorizLine; /* Starting line in ST screen */ - - do /* y-loop */ - { - eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */ - edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */ - ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */ - esi = (Uint16 *)pPCScreenDest; /* PC format screen */ + This file is distributed under the GNU Public License, version 2 or at your + option any later version. Read the file gpl.txt for details. - AdjustLinePaletteRemap(); - -/* - call AdjustLinePaletteRemap // Change palette table, DO NOT corrupt edx,edi,esi or ebp! - jmp Line_ConvertLowRes_320x16Bit // 0 palette same, can do check tests -} + Screen Conversion, Low Res to 320x16Bit */ -/* -NAKED void Line_ConvertLowRes_320x16Bit(void) +static void ConvertLowRes_320x16Bit(void) { -*/ + Uint32 *edi, *ebp; + Uint16 *esi; + Uint32 eax, edx; + Uint32 ebx, ecx; + int y, x, update; - ScrX=STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels(8 bytes) */ -/* - __asm { - mov eax,[STScreenWidthBytes] // Amount to draw across - shr eax,3 // in 16-pixels(8 bytes) - mov [ScrX],eax -*/ + Convert_StartFrame(); /* Start frame, track palettes */ - do /* x-loop */ - { - /* Do 16 pixels at one time */ - ebx=*edi; - ecx=*(edi+1); - /* ScrUpdateFlag seems not to be set correctly?! - Thothy */ - if( 1||(ScrUpdateFlag&0xe0000000) || ebx!=*ebp || ecx!=*(ebp+1) ) /* Does differ? */ - { /* copy word */ -/* -x_loop: + for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) + { - // Do 16 pixels at one time - mov ebx,[edi] - mov ecx,4[edi] - // Full update? or just test changes? - test [ScrUpdateFlag],0xe0000000 - jne copy_word // Force - // Does differ? - cmp ebx,[ebp] - jne copy_word - cmp ecx,4[ebp] - je next_word // Pixels are same as last frame, so ignore -*/ + 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 */ - bScreenContentsChanged=TRUE; - -/* -copy_word: - mov [bScreenContentsChanged],TRUE -*/ + update = AdjustLinePaletteRemap(y) & PALETTEMASK_UPDATEMASK; -#if SDL_BYTEORDER == SDL_BIG_ENDIAN - /* Plot pixels */ - LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ - PLOT_LOW_320_16BIT(12) ; - LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ - PLOT_LOW_320_16BIT(4) ; - LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ - PLOT_LOW_320_16BIT(8) ; - LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ - PLOT_LOW_320_16BIT(0) ; -#else - /* Plot pixels */ - LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ - PLOT_LOW_320_16BIT(4) ; - LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ - PLOT_LOW_320_16BIT(12) ; - LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ - PLOT_LOW_320_16BIT(0) ; - LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ - PLOT_LOW_320_16BIT(8) ; -#endif - } + x = STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels (8 bytes) */ - esi += 16; /* Next PC pixels */ - edi += 2; /* Next ST pixels */ - ebp += 2; /* Next ST copy pixels */ - } - while( --ScrX ); /* Loop on X */ -/* -next_word: - add esi,16*2 // Next PC pixels - add edi,8 // Next ST pixels - add ebp,8 // Next ST copy pixels + do /* x-loop */ + { + /* Do 16 pixels at one time */ + ebx = *edi; + ecx = *(edi+1); - dec [ScrX] - jne x_loop // Loop on X -*/ + if (update || ebx!=*ebp || ecx!=*(ebp+1)) /* Does differ? */ + { + /* copy word */ - pPCScreenDest = (void *)(((unsigned char *)pPCScreenDest)+PCScreenBytesPerLine); /* Offset to next line */ - ScrY += 1; - } - while( ScrY < STScreenEndHorizLine ); /* Loop on Y */ -/* - mov eax,[pPCScreenDest] - add eax,[PCScreenBytesPerLine] // Offset to next line - mov [pPCScreenDest],eax - - inc [ScrY] - mov eax,[STScreenEndHorizLine] - cmp [ScrY],eax - jne ConvertLowRes_320x16Bit_YLoop // And on Y - - pop ebx - pop esi - pop edi - pop ebp + bScreenContentsChanged = true; - ret - } -*/ -} +#if SDL_BYTEORDER == SDL_BIG_ENDIAN + /* Plot pixels */ + LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ + PLOT_LOW_320_16BIT(12) ; + LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ + PLOT_LOW_320_16BIT(4) ; + LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ + PLOT_LOW_320_16BIT(8) ; + LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ + PLOT_LOW_320_16BIT(0) ; +#else + /* Plot pixels */ + LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */ + PLOT_LOW_320_16BIT(4) ; + LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */ + PLOT_LOW_320_16BIT(12) ; + LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */ + PLOT_LOW_320_16BIT(0) ; + LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */ + PLOT_LOW_320_16BIT(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); + } +}