Mercurial > sdl-ios-xcode
view src/video/SDL_pixels.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 19 Mar 2006 06:31:34 +0000 |
parents | d910939febfa |
children | 61c237f69076 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* General (mostly internal) pixel/color manipulation routines for SDL */ #include "SDL_endian.h" #include "SDL_video.h" #include "SDL_sysvideo.h" #include "SDL_blit.h" #include "SDL_pixels_c.h" #include "SDL_RLEaccel_c.h" /* Helper functions */ /* * Allocate a pixel format structure and fill it according to the given info. */ SDL_PixelFormat *SDL_AllocFormat(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) { SDL_PixelFormat *format; Uint32 mask; /* Allocate an empty pixel format structure */ format = SDL_malloc(sizeof(*format)); if ( format == NULL ) { SDL_OutOfMemory(); return(NULL); } SDL_memset(format, 0, sizeof(*format)); format->alpha = SDL_ALPHA_OPAQUE; /* Set up the format */ format->BitsPerPixel = bpp; format->BytesPerPixel = (bpp+7)/8; if ( Rmask || Bmask || Gmask ) { /* Packed pixels with custom mask */ format->palette = NULL; format->Rshift = 0; format->Rloss = 8; if ( Rmask ) { for ( mask = Rmask; !(mask&0x01); mask >>= 1 ) ++format->Rshift; for ( ; (mask&0x01); mask >>= 1 ) --format->Rloss; } format->Gshift = 0; format->Gloss = 8; if ( Gmask ) { for ( mask = Gmask; !(mask&0x01); mask >>= 1 ) ++format->Gshift; for ( ; (mask&0x01); mask >>= 1 ) --format->Gloss; } format->Bshift = 0; format->Bloss = 8; if ( Bmask ) { for ( mask = Bmask; !(mask&0x01); mask >>= 1 ) ++format->Bshift; for ( ; (mask&0x01); mask >>= 1 ) --format->Bloss; } format->Ashift = 0; format->Aloss = 8; if ( Amask ) { for ( mask = Amask; !(mask&0x01); mask >>= 1 ) ++format->Ashift; for ( ; (mask&0x01); mask >>= 1 ) --format->Aloss; } format->Rmask = Rmask; format->Gmask = Gmask; format->Bmask = Bmask; format->Amask = Amask; } else if ( bpp > 8 ) { /* Packed pixels with standard mask */ /* R-G-B */ if ( bpp > 24 ) bpp = 24; format->Rloss = 8-(bpp/3); format->Gloss = 8-(bpp/3)-(bpp%3); format->Bloss = 8-(bpp/3); format->Rshift = ((bpp/3)+(bpp%3))+(bpp/3); format->Gshift = (bpp/3); format->Bshift = 0; format->Rmask = ((0xFF>>format->Rloss)<<format->Rshift); format->Gmask = ((0xFF>>format->Gloss)<<format->Gshift); format->Bmask = ((0xFF>>format->Bloss)<<format->Bshift); } else { /* Palettized formats have no mask info */ format->Rloss = 8; format->Gloss = 8; format->Bloss = 8; format->Aloss = 8; format->Rshift = 0; format->Gshift = 0; format->Bshift = 0; format->Ashift = 0; format->Rmask = 0; format->Gmask = 0; format->Bmask = 0; format->Amask = 0; } if ( bpp <= 8 ) { /* Palettized mode */ int ncolors = 1<<bpp; #ifdef DEBUG_PALETTE fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); #endif format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette)); if ( format->palette == NULL ) { SDL_FreeFormat(format); SDL_OutOfMemory(); return(NULL); } (format->palette)->ncolors = ncolors; (format->palette)->colors = (SDL_Color *)SDL_malloc( (format->palette)->ncolors*sizeof(SDL_Color)); if ( (format->palette)->colors == NULL ) { SDL_FreeFormat(format); SDL_OutOfMemory(); return(NULL); } if ( Rmask || Bmask || Gmask ) { /* create palette according to masks */ int i; int Rm=0,Gm=0,Bm=0; int Rw=0,Gw=0,Bw=0; #ifdef ENABLE_PALETTE_ALPHA int Am=0,Aw=0; #endif if(Rmask) { Rw=8-format->Rloss; for(i=format->Rloss;i>0;i-=Rw) Rm|=1<<i; } #ifdef DEBUG_PALETTE fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); #endif if(Gmask) { Gw=8-format->Gloss; for(i=format->Gloss;i>0;i-=Gw) Gm|=1<<i; } #ifdef DEBUG_PALETTE fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); #endif if(Bmask) { Bw=8-format->Bloss; for(i=format->Bloss;i>0;i-=Bw) Bm|=1<<i; } #ifdef DEBUG_PALETTE fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); #endif #ifdef ENABLE_PALETTE_ALPHA if(Amask) { Aw=8-format->Aloss; for(i=format->Aloss;i>0;i-=Aw) Am|=1<<i; } # ifdef DEBUG_PALETTE fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); # endif #endif for(i=0; i < ncolors; ++i) { int r,g,b; r=(i&Rmask)>>format->Rshift; r=(r<<format->Rloss)|((r*Rm)>>Rw); format->palette->colors[i].r=r; g=(i&Gmask)>>format->Gshift; g=(g<<format->Gloss)|((g*Gm)>>Gw); format->palette->colors[i].g=g; b=(i&Bmask)>>format->Bshift; b=(b<<format->Bloss)|((b*Bm)>>Bw); format->palette->colors[i].b=b; #ifdef ENABLE_PALETTE_ALPHA a=(i&Amask)>>format->Ashift; a=(a<<format->Aloss)|((a*Am)>>Aw); format->palette->colors[i].unused=a; #else format->palette->colors[i].unused=0; #endif } } else if ( ncolors == 2 ) { /* Create a black and white bitmap palette */ format->palette->colors[0].r = 0xFF; format->palette->colors[0].g = 0xFF; format->palette->colors[0].b = 0xFF; format->palette->colors[1].r = 0x00; format->palette->colors[1].g = 0x00; format->palette->colors[1].b = 0x00; } else { /* Create an empty palette */ SDL_memset((format->palette)->colors, 0, (format->palette)->ncolors*sizeof(SDL_Color)); } } return(format); } SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) { if ( surface->format ) { SDL_FreeFormat(surface->format); SDL_FormatChanged(surface); } surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); return surface->format; } /* * Change any previous mappings from/to the new surface format */ void SDL_FormatChanged(SDL_Surface *surface) { static int format_version = 0; ++format_version; if ( format_version < 0 ) { /* It wrapped... */ format_version = 1; } surface->format_version = format_version; SDL_InvalidateMap(surface->map); } /* * Free a previously allocated format structure */ void SDL_FreeFormat(SDL_PixelFormat *format) { if ( format ) { if ( format->palette ) { if ( format->palette->colors ) { SDL_free(format->palette->colors); } SDL_free(format->palette); } SDL_free(format); } } /* * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors */ void SDL_DitherColors(SDL_Color *colors, int bpp) { int i; if(bpp != 8) return; /* only 8bpp supported right now */ for(i = 0; i < 256; i++) { int r, g, b; /* map each bit field to the full [0, 255] interval, so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ r = i & 0xe0; r |= r >> 3 | r >> 6; colors[i].r = r; g = (i << 3) & 0xe0; g |= g >> 3 | g >> 6; colors[i].g = g; b = i & 0x3; b |= b << 2; b |= b << 4; colors[i].b = b; } } /* * Calculate the pad-aligned scanline width of a surface */ Uint16 SDL_CalculatePitch(SDL_Surface *surface) { Uint16 pitch; /* Surface should be 4-byte aligned for speed */ pitch = surface->w*surface->format->BytesPerPixel; switch (surface->format->BitsPerPixel) { case 1: pitch = (pitch+7)/8; break; case 4: pitch = (pitch+1)/2; break; default: break; } pitch = (pitch + 3) & ~3; /* 4-byte aligning */ return(pitch); } /* * Match an RGB value to a particular palette index */ Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b) { /* Do colorspace distance matching */ unsigned int smallest; unsigned int distance; int rd, gd, bd; int i; Uint8 pixel=0; smallest = ~0; for ( i=0; i<pal->ncolors; ++i ) { rd = pal->colors[i].r - r; gd = pal->colors[i].g - g; bd = pal->colors[i].b - b; distance = (rd*rd)+(gd*gd)+(bd*bd); if ( distance < smallest ) { pixel = i; if ( distance == 0 ) { /* Perfect match! */ break; } smallest = distance; } } return(pixel); } /* Find the opaque pixel value corresponding to an RGB triple */ Uint32 SDL_MapRGB(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) { if ( format->palette == NULL ) { return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | format->Amask; } else { return SDL_FindColor(format->palette, r, g, b); } } /* Find the pixel value corresponding to an RGBA quadruple */ Uint32 SDL_MapRGBA(SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, Uint8 a) { if ( format->palette == NULL ) { return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | ((a >> format->Aloss) << format->Ashift & format->Amask); } else { return SDL_FindColor(format->palette, r, g, b); } } void SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) { if ( fmt->palette == NULL ) { /* * This makes sure that the result is mapped to the * interval [0..255], and the maximum value for each * component is 255. This is important to make sure * that white is indeed reported as (255, 255, 255), * and that opaque alpha is 255. * This only works for RGB bit fields at least 4 bit * wide, which is almost always the case. */ unsigned v; v = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); v = (pixel & fmt->Gmask) >> fmt->Gshift; *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); v = (pixel & fmt->Bmask) >> fmt->Bshift; *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); if(fmt->Amask) { v = (pixel & fmt->Amask) >> fmt->Ashift; *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); } else { *a = SDL_ALPHA_OPAQUE; } } else { *r = fmt->palette->colors[pixel].r; *g = fmt->palette->colors[pixel].g; *b = fmt->palette->colors[pixel].b; *a = SDL_ALPHA_OPAQUE; } } void SDL_GetRGB(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r,Uint8 *g,Uint8 *b) { if ( fmt->palette == NULL ) { /* the note for SDL_GetRGBA above applies here too */ unsigned v; v = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); v = (pixel & fmt->Gmask) >> fmt->Gshift; *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); v = (pixel & fmt->Bmask) >> fmt->Bshift; *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); } else { *r = fmt->palette->colors[pixel].r; *g = fmt->palette->colors[pixel].g; *b = fmt->palette->colors[pixel].b; } } /* Apply gamma to a set of colors - this is easy. :) */ void SDL_ApplyGamma(Uint16 *gamma, SDL_Color *colors, SDL_Color *output, int ncolors) { int i; for ( i=0; i<ncolors; ++i ) { output[i].r = gamma[0*256 + colors[i].r] >> 8; output[i].g = gamma[1*256 + colors[i].g] >> 8; output[i].b = gamma[2*256 + colors[i].b] >> 8; } } /* Map from Palette to Palette */ static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) { Uint8 *map; int i; if ( identical ) { if ( src->ncolors <= dst->ncolors ) { /* If an identical palette, no need to map */ if ( SDL_memcmp(src->colors, dst->colors, src->ncolors* sizeof(SDL_Color)) == 0 ) { *identical = 1; return(NULL); } } *identical = 0; } map = (Uint8 *)SDL_malloc(src->ncolors); if ( map == NULL ) { SDL_OutOfMemory(); return(NULL); } for ( i=0; i<src->ncolors; ++i ) { map[i] = SDL_FindColor(dst, src->colors[i].r, src->colors[i].g, src->colors[i].b); } return(map); } /* Map from Palette to BitField */ static Uint8 *Map1toN(SDL_Palette *src, SDL_PixelFormat *dst) { Uint8 *map; int i; int bpp; unsigned alpha; bpp = ((dst->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel); map = (Uint8 *)SDL_malloc(src->ncolors*bpp); if ( map == NULL ) { SDL_OutOfMemory(); return(NULL); } alpha = dst->Amask ? SDL_ALPHA_OPAQUE : 0; /* We memory copy to the pixel map so the endianness is preserved */ for ( i=0; i<src->ncolors; ++i ) { ASSEMBLE_RGBA(&map[i*bpp], dst->BytesPerPixel, dst, src->colors[i].r, src->colors[i].g, src->colors[i].b, alpha); } return(map); } /* Map from BitField to Dithered-Palette to Palette */ static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_Palette *dst, int *identical) { /* Generate a 256 color dither palette */ SDL_Palette dithered; SDL_Color colors[256]; /* SDL_DitherColors does not initialize the 'unused' component of colors, but Map1to1 compares it against dst, so we should initialize it. */ SDL_memset(colors, 0, sizeof(colors)); dithered.ncolors = 256; SDL_DitherColors(colors, 8); dithered.colors = colors; return(Map1to1(&dithered, dst, identical)); } SDL_BlitMap *SDL_AllocBlitMap(void) { SDL_BlitMap *map; /* Allocate the empty map */ map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); if ( map == NULL ) { SDL_OutOfMemory(); return(NULL); } SDL_memset(map, 0, sizeof(*map)); /* Allocate the software blit data */ map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); if ( map->sw_data == NULL ) { SDL_FreeBlitMap(map); SDL_OutOfMemory(); return(NULL); } SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); /* It's ready to go */ return(map); } void SDL_InvalidateMap(SDL_BlitMap *map) { if ( ! map ) { return; } map->dst = NULL; map->format_version = (unsigned int)-1; if ( map->table ) { SDL_free(map->table); map->table = NULL; } } int SDL_MapSurface (SDL_Surface *src, SDL_Surface *dst) { SDL_PixelFormat *srcfmt; SDL_PixelFormat *dstfmt; SDL_BlitMap *map; /* Clear out any previous mapping */ map = src->map; if ( (src->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { SDL_UnRLESurface(src, 1); } SDL_InvalidateMap(map); /* Figure out what kind of mapping we're doing */ map->identity = 0; srcfmt = src->format; dstfmt = dst->format; switch (srcfmt->BytesPerPixel) { case 1: switch (dstfmt->BytesPerPixel) { case 1: /* Palette --> Palette */ /* If both SDL_HWSURFACE, assume have same palette */ if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { map->identity = 1; } else { map->table = Map1to1(srcfmt->palette, dstfmt->palette, &map->identity); } if ( ! map->identity ) { if ( map->table == NULL ) { return(-1); } } if (srcfmt->BitsPerPixel!=dstfmt->BitsPerPixel) map->identity = 0; break; default: /* Palette --> BitField */ map->table = Map1toN(srcfmt->palette, dstfmt); if ( map->table == NULL ) { return(-1); } break; } break; default: switch (dstfmt->BytesPerPixel) { case 1: /* BitField --> Palette */ map->table = MapNto1(srcfmt, dstfmt->palette, &map->identity); if ( ! map->identity ) { if ( map->table == NULL ) { return(-1); } } map->identity = 0; /* Don't optimize to copy */ break; default: /* BitField --> BitField */ if ( FORMAT_EQUAL(srcfmt, dstfmt) ) map->identity = 1; break; } break; } map->dst = dst; map->format_version = dst->format_version; /* Choose your blitters wisely */ return(SDL_CalculateBlit(src)); } void SDL_FreeBlitMap(SDL_BlitMap *map) { if ( map ) { SDL_InvalidateMap(map); if ( map->sw_data != NULL ) { SDL_free(map->sw_data); } SDL_free(map); } }