Mercurial > sdl-ios-xcode
view src/video/SDL_blit.c @ 934:af585d6efec8
Date: Thu, 17 Jun 2004 11:38:51 -0700 (PDT)
From: Eric Wing <ewing2121@yahoo.com>
Subject: New OS X patch (was Re: [SDL] Bug with inverted mouse coordinates in
I have a new patch for OS X I would like to submit.
First, it appears no further action has been taken on
my fix from Apple on the OpenGL windowed mode mouse
inversion problem. The fix would reunify the code, and
no longer require case checking for which version of
the OS you are running. This is probably a good fix
because the behavior with the old code could change
again with future versions of the OS, so those fixes
are included in this new patch.
But in addition, when I was at Apple, I asked them
about the ability to distinguish between the modifier
keys on the left and right sides of the keyboard (e.g.
Left Shift, Right Shift, Left/Right Alt, L/R Cmd, L/R
Ctrl). They told me that starting with Panther, the OS
began supporting this feature. This has always been a
source of annoyance for me when bringing a program
that comes from Windows or Linux to OS X when the
keybindings happened to need distinguishable left-side
and right-side keys. So the rest of the patch I am
submitting contains new code to support this feature
on Panther (and presumably later versions of the OS).
So after removing the OS version checks for the mouse
inversion problem, I reused the OS version checks to
activate the Left/Right detection of modifier keys. If
you are running Panther (or above), the new code will
attempt to distinguish between sides. For the older
OS's, the code path reverts to the original code.
I've tested with Panther on a G4 Cube, G5 dual
processor, and Powerbook Rev C. The Cube and G5
keyboards demonstrated the ability to distinguish
between sides. The Powerbook seems to only have
left-side keys, but the patch was still able to handle
it by producing the same results as before the patch.
I also wanted to test a non-Apple keyboard.
Unfortunately, I don't have any PC USB keyboards.
However, I was able to borrow a Sun Microsystems USB
keyboard, so I tried that out on the G5, and I got the
correct behavior for left and right sides. I'm
expecting that if it worked with a Sun keyboard, most
other keyboards should work with no problems.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 20 Aug 2004 22:35:23 +0000 |
parents | 9301b429c99f |
children | 68f607298ca9 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL_error.h" #include "SDL_video.h" #include "SDL_sysvideo.h" #include "SDL_blit.h" #include "SDL_RLEaccel_c.h" #include "SDL_pixels_c.h" #include "SDL_memops.h" #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) #define MMX_ASMBLIT #endif #if defined(MMX_ASMBLIT) #include "SDL_cpuinfo.h" #include "mmx.h" #endif /* The general purpose software blit routine */ static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect) { int okay; int src_locked; int dst_locked; /* Everything is okay at the beginning... */ okay = 1; /* Lock the destination if it's in hardware */ dst_locked = 0; if ( SDL_MUSTLOCK(dst) ) { if ( SDL_LockSurface(dst) < 0 ) { okay = 0; } else { dst_locked = 1; } } /* Lock the source if it's in hardware */ src_locked = 0; if ( SDL_MUSTLOCK(src) ) { if ( SDL_LockSurface(src) < 0 ) { okay = 0; } else { src_locked = 1; } } /* Set up source and destination buffer pointers, and BLIT! */ if ( okay && srcrect->w && srcrect->h ) { SDL_BlitInfo info; SDL_loblit RunBlit; /* Set up the blit information */ info.s_pixels = (Uint8 *)src->pixels + (Uint16)srcrect->y*src->pitch + (Uint16)srcrect->x*src->format->BytesPerPixel; info.s_width = srcrect->w; info.s_height = srcrect->h; info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; info.d_pixels = (Uint8 *)dst->pixels + (Uint16)dstrect->y*dst->pitch + (Uint16)dstrect->x*dst->format->BytesPerPixel; info.d_width = dstrect->w; info.d_height = dstrect->h; info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; info.aux_data = src->map->sw_data->aux_data; info.src = src->format; info.table = src->map->table; info.dst = dst->format; RunBlit = src->map->sw_data->blit; /* Run the actual software blit */ RunBlit(&info); } /* We need to unlock the surfaces if they're locked */ if ( dst_locked ) { SDL_UnlockSurface(dst); } if ( src_locked ) { SDL_UnlockSurface(src); } /* Blit is done! */ return(okay ? 0 : -1); } #ifdef MMX_ASMBLIT static __inline__ void SDL_memcpyMMX(char* to,char* from,int len) { int i; for(i=0; i<len/8; i++) { __asm__ __volatile__ ( " movq (%0), %%mm0\n" " movq %%mm0, (%1)\n" : : "r" (from), "r" (to) : "memory"); from+=8; to+=8; } if (len&7) SDL_memcpy(to, from, len&7); } static __inline__ void SDL_memcpySSE(char* to,char* from,int len) { int i; __asm__ __volatile__ ( " prefetchnta (%0)\n" " prefetchnta 64(%0)\n" " prefetchnta 128(%0)\n" " prefetchnta 192(%0)\n" : : "r" (from) ); for(i=0; i<len/8; i++) { __asm__ __volatile__ ( " prefetchnta 256(%0)\n" " movq (%0), %%mm0\n" " movntq %%mm0, (%1)\n" : : "r" (from), "r" (to) : "memory"); from+=8; to+=8; } if (len&7) SDL_memcpy(to, from, len&7); } #endif static void SDL_BlitCopy(SDL_BlitInfo *info) { Uint8 *src, *dst; int w, h; int srcskip, dstskip; w = info->d_width*info->dst->BytesPerPixel; h = info->d_height; src = info->s_pixels; dst = info->d_pixels; srcskip = w+info->s_skip; dstskip = w+info->d_skip; #ifdef MMX_ASMBLIT if(SDL_HasSSE()) { while ( h-- ) { SDL_memcpySSE(dst, src, w); src += srcskip; dst += dstskip; } __asm__ __volatile__ ( " emms\n" ::); } else if(SDL_HasMMX()) { while ( h-- ) { SDL_memcpyMMX(dst, src, w); src += srcskip; dst += dstskip; } __asm__ __volatile__ ( " emms\n" ::); } else #endif while ( h-- ) { SDL_memcpy(dst, src, w); src += srcskip; dst += dstskip; } } static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) { Uint8 *src, *dst; int w, h; int srcskip, dstskip; w = info->d_width*info->dst->BytesPerPixel; h = info->d_height; src = info->s_pixels; dst = info->d_pixels; srcskip = w+info->s_skip; dstskip = w+info->d_skip; if ( dst < src ) { while ( h-- ) { SDL_memcpy(dst, src, w); src += srcskip; dst += dstskip; } } else { src += ((h-1) * srcskip); dst += ((h-1) * dstskip); while ( h-- ) { SDL_revcpy(dst, src, w); src -= srcskip; dst -= dstskip; } } } /* Figure out which of many blit routines to set up on a surface */ int SDL_CalculateBlit(SDL_Surface *surface) { int blit_index; /* Clean everything out to start */ if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { SDL_UnRLESurface(surface, 1); } surface->map->sw_blit = NULL; /* Figure out if an accelerated hardware blit is possible */ surface->flags &= ~SDL_HWACCEL; if ( surface->map->identity ) { int hw_blit_ok; if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { /* We only support accelerated blitting to hardware */ if ( surface->map->dst->flags & SDL_HWSURFACE ) { hw_blit_ok = current_video->info.blit_hw; } else { hw_blit_ok = 0; } if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { hw_blit_ok = current_video->info.blit_hw_CC; } if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { hw_blit_ok = current_video->info.blit_hw_A; } } else { /* We only support accelerated blitting to hardware */ if ( surface->map->dst->flags & SDL_HWSURFACE ) { hw_blit_ok = current_video->info.blit_sw; } else { hw_blit_ok = 0; } if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { hw_blit_ok = current_video->info.blit_sw_CC; } if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { hw_blit_ok = current_video->info.blit_sw_A; } } if ( hw_blit_ok ) { SDL_VideoDevice *video = current_video; SDL_VideoDevice *this = current_video; video->CheckHWBlit(this, surface, surface->map->dst); } } /* Get the blit function index, based on surface mode */ /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ blit_index = 0; blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; if ( surface->flags & SDL_SRCALPHA && (surface->format->alpha != SDL_ALPHA_OPAQUE || surface->format->Amask) ) { blit_index |= 2; } /* Check for special "identity" case -- copy blit */ if ( surface->map->identity && blit_index == 0 ) { surface->map->sw_data->blit = SDL_BlitCopy; /* Handle overlapping blits on the same surface */ if ( surface == surface->map->dst ) { surface->map->sw_data->blit = SDL_BlitCopyOverlap; } } else { if ( surface->format->BitsPerPixel < 8 ) { surface->map->sw_data->blit = SDL_CalculateBlit0(surface, blit_index); } else { switch ( surface->format->BytesPerPixel ) { case 1: surface->map->sw_data->blit = SDL_CalculateBlit1(surface, blit_index); break; case 2: case 3: case 4: surface->map->sw_data->blit = SDL_CalculateBlitN(surface, blit_index); break; default: surface->map->sw_data->blit = NULL; break; } } } /* Make sure we have a blit function */ if ( surface->map->sw_data->blit == NULL ) { SDL_InvalidateMap(surface->map); SDL_SetError("Blit combination not supported"); return(-1); } /* Choose software blitting function */ if(surface->flags & SDL_RLEACCELOK && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { if(surface->map->identity && (blit_index == 1 || (blit_index == 3 && !surface->format->Amask))) { if ( SDL_RLESurface(surface) == 0 ) surface->map->sw_blit = SDL_RLEBlit; } else if(blit_index == 2 && surface->format->Amask) { if ( SDL_RLESurface(surface) == 0 ) surface->map->sw_blit = SDL_RLEAlphaBlit; } } if ( surface->map->sw_blit == NULL ) { surface->map->sw_blit = SDL_SoftBlit; } return(0); }