libretro/smsplus-gx
1
0
Fork 0
mirror of https://github.com/libretro/smsplus-gx.git synced 2025-03-03 14:38:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add Scale2x files.

Browse Source 
They are slightly modified for our own use (especially 16-bits output)
but otherwise it should be the same.
This commit is contained in:
gameblabla 2019-03-13 02:11:38 +01:00
parent 8f5b90b1b9
commit 66746c951b
No known key found for this signature in database
GPG Key ID: B24EFBB23B5F76CB
2 changed files with 102 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
source/scale2x/scale2x.c Normal file
View File

@ -0,0 +1,66 @@
/*
pygame - Python Game Library
Copyright (C) 2000-2001 Pete Shinners
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA
Pete Shinners
pete@shinners.org
*/
/*
This implements the AdvanceMAME Scale2x feature found on this page,
http://advancemame.sourceforge.net/scale2x.html
It is an incredibly simple and powerful image doubling routine that does
an astonishing job of doubling game graphic data while interpolating out
the jaggies. Congrats to the AdvanceMAME team, I'm very impressed and
surprised with this code!
*/
/* https://github.com/CTPUG/pygame_cffi/blob/master/cffi_builders/lib/scale2x.c */
#include <SDL/SDL.h>
#include "scale2x.h"
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
/* This requires a destination surface already setup to be twice as large as the source.
* Only for 16-bits */
void scale2x(uint16_t* restrict srcpixels, uint16_t* restrict dstpixels, const int32_t srcpitch, const int32_t dstpitch, const int32_t width, const int32_t height)
{
int32_t looph, loopw;
uint8_t* restrict srcpix = (uint8_t* restrict)srcpixels;
uint8_t* restrict dstpix = (uint8_t* restrict)dstpixels;
uint16_t E0, E1, E2, E3, B, D, E, F, H;
for(looph = 0; looph < height; ++looph)
{
for(loopw = 0; loopw < width; ++loopw)
{
B = *(uint16_t* restrict)(srcpix + (MAX(0,looph-1)*srcpitch) + (2*loopw));
D = *(uint16_t* restrict)(srcpix + (looph*srcpitch) + (2*MAX(0,loopw-1)));
E = *(uint16_t* restrict)(srcpix + (looph*srcpitch) + (2*loopw));
F = *(uint16_t* restrict)(srcpix + (looph*srcpitch) + (2*MIN(width-1,loopw+1)));
H = *(uint16_t* restrict)(srcpix + (MIN(height-1,looph+1)*srcpitch) + (2*loopw));
E0 = D == B && B != F && D != H ? D : E;
E1 = B == F && B != D && F != H ? F : E;
E2 = D == H && D != B && H != F ? D : E;
E3 = H == F && D != H && B != F ? F : E;
*(uint16_t* restrict)(dstpix + looph*2*dstpitch + loopw*2*2) = E0;
*(uint16_t* restrict)(dstpix + looph*2*dstpitch + (loopw*2+1)*2) = E1;
*(uint16_t* restrict)(dstpix + (looph*2+1)*dstpitch + loopw*2*2) = E2;
*(uint16_t* restrict)(dstpix + (looph*2+1)*dstpitch + (loopw*2+1)*2) = E3;
}
}
}

36
source/scale2x/scale2x.h Normal file
View File

@ -0,0 +1,36 @@
/*
* This file is part of the Advance project.
*
* Copyright (C) 2003, 2004, 2008 Andrea Mazzoleni
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* In addition, as a special exception, Andrea Mazzoleni
* gives permission to link the code of this program with
* the MAME library (or with modified versions of MAME that use the
* same license as MAME), and distribute linked combinations including
* the two. You must obey the GNU General Public License in all
* respects for all of the code used other than MAME. If you modify
* this file, you may extend this exception to your version of the
* file, but you are not obligated to do so. If you do not wish to
* do so, delete this exception statement from your version.
*/
#ifndef SCALE2X_H
#define SCALE2X_H
#include <SDL/SDL.h>
void scale2x(uint16_t* restrict srcpixels, uint16_t* restrict dstpixels, const int32_t srcpitch, const int32_t dstpitch, const int32_t width, const int32_t height);
#endif