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| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com |
| */ |
| |
| #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" |
| |
| /* 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 ( dst->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
| SDL_VideoDevice *video = current_video; |
| SDL_VideoDevice *this = current_video; |
| if ( video->LockHWSurface(this, dst) < 0 ) { |
| okay = 0; |
| } else { |
| dst_locked = 1; |
| } |
| } |
| /* Lock the source if it's in hardware */ |
| src_locked = 0; |
| if ( src->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
| SDL_VideoDevice *video = current_video; |
| SDL_VideoDevice *this = current_video; |
| if ( video->LockHWSurface(this, src) < 0 ) { |
| okay = 0; |
| } else { |
| src_locked = 1; |
| } |
| } |
| |
| /* Unencode the destination if it's RLE encoded */ |
| if ( dst->flags & SDL_RLEACCEL ) { |
| SDL_UnRLESurface(dst, 1); |
| dst->flags |= SDL_RLEACCEL; /* save accel'd state */ |
| } |
| |
| /* 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 + src->offset + |
| (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 + dst->offset + |
| (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); |
| } |
| |
| /* Re-encode the destination if it's RLE encoded */ |
| if ( dst->flags & SDL_RLEACCEL ) { |
| dst->flags &= ~SDL_RLEACCEL; /* stop lying */ |
| SDL_RLESurface(dst); |
| } |
| |
| /* We need to unlock the surfaces if they're locked */ |
| if ( dst_locked ) { |
| SDL_VideoDevice *video = current_video; |
| SDL_VideoDevice *this = current_video; |
| video->UnlockHWSurface(this, dst); |
| } else |
| if ( src_locked ) { |
| SDL_VideoDevice *video = current_video; |
| SDL_VideoDevice *this = current_video; |
| video->UnlockHWSurface(this, src); |
| } |
| /* Blit is done! */ |
| return(okay ? 0 : -1); |
| } |
| |
| 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; |
| 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); |
| } |
| |