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ac4de708b5
* source/nds/displaymodes.cpp: Rewritten, assigned copyright to myself (GPLv2). * CATSFC/system/language.msg: Changed the English and French text for display modes.
88 lines
3.3 KiB
C++
88 lines
3.3 KiB
C++
/* displaymodes.cpp
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*
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* Copyright (C) 2012 GBAtemp user Nebuleon.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include "ds2_types.h"
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#include "ds2io.h"
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#include "gfx.h"
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static uint16 SevenToSixScanlineResize (uint16 TopColour, uint16 BottomColour, uint8 TopFraction, uint8 BottomFraction)
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{
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// Speed hacks!
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if (TopColour == BottomColour) // Two colours identical (no calc)
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return TopColour;
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if (TopColour == 0x0000) // From black to a non-identical colour
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return
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// Red component
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( ( ((BottomColour >> 10) & 0x1F) * BottomFraction / 7 ) << 10 )
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// Green component
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| ( ( ((BottomColour >> 5) & 0x1F) * BottomFraction / 7 ) << 5 )
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// Blue component
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| ( ( (BottomColour & 0x1F) * BottomFraction / 7 ) )
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;
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if (BottomColour == 0x0000) // To black from a non-identical colour
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return
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// Red component
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( ( ((TopColour >> 10) & 0x1F) * TopFraction / 7 ) << 10 )
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// Green component
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| ( ( ((TopColour >> 5) & 0x1F) * TopFraction / 7 ) << 5 )
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// Blue component
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| ( ( (TopColour & 0x1F) * TopFraction / 7 ) )
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;
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return
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// Red component
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( ( ((TopColour >> 10) & 0x1F) * TopFraction / 7 + ((BottomColour >> 10) & 0x1F) * BottomFraction / 7 ) << 10 )
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// Green component
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| ( ( ((TopColour >> 5) & 0x1F) * TopFraction / 7 + ((BottomColour >> 5) & 0x1F) * BottomFraction / 7 ) << 5 )
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// Blue component
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| ( ( (TopColour & 0x1F) * TopFraction / 7 + (BottomColour & 0x1F) * BottomFraction / 7 ) )
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;
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}
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void NDSSFCDrawFrameAntialiased ()
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{
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uint16 X, Y;
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uint16 *SrcTop = (uint16 *) GFX.Screen, *SrcBottom = SrcTop + 256, *Dest = (uint16 *) up_screen_addr;
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for (Y = 0; Y < 224; Y += 7)
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{
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 6, 1);
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// At the end of this loop, line 1 for this block of 6
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// has been drawn from the 2 first lines in the block
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// of 7. Do the rest.
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 5, 2);
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 4, 3);
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 3, 4);
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 2, 5);
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for (X = 0; X < 256; X++)
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*Dest++ = SevenToSixScanlineResize (*SrcTop++, *SrcBottom++, 1, 6);
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// At the end of these loops, SrcTop and SrcBottom point to
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// the first element in the 7th line of the current block and
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// the first element in the 1st line of the next.
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// We need to increase the pointer to start on lines 1 & 2.
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SrcTop += 256;
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SrcBottom += 256;
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}
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}
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