libvo/vo_svga.c

   1 /*
   2  * video driver for SVGAlib
   3  * by Zoltan Mark Vician <se7en@sch.bme.hu>
   4  * Code started: Mon Apr  1 23:25:47 2001
   5  * Some changes by Matan Ziv-Av <matan@svgalib.org>
   6  * complete rewrite by Ivan Kalvachev 19 Mar 2003
   7  *
   8  * This file is part of MPlayer.
   9  *
  10  * MPlayer is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * MPlayer is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 /*
  26 Wrangings:
  27  -  1bpp doesn't work right for me with '-double' and svgalib 1.4.3,
  28     but works OK with svgalib 1.9.17
  29  -  The HW acceleration is not tested - svgalibs supports few chipsets,
  30     and i don't have any of them. If it works for you then let me know.
  31     I will remove this warning after confirm its status.
  32  -  retrace sync works only in doublebuffer mode.
  33  -  the retrace sync may slow down decoding a lot - mplayer is blocked while
  34     waiting for retrace
  35  -  denoise3d fails to find common colorspace, use -vf denoise3d,scale
  36
  37 TODO:
  38  - let choose_best_mode take aspect into account
  39  - set palette from mpi->palette or mpi->plane[1]
  40  - make faster OSD black bars clear - need some OSD changes
  41  - Make nicer CONFIG parsing
  42  - change video mode logical width to match img->stride[0] - for HW only
  43 */
  44
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <vga.h>
  50
  51 #include <limits.h>
  52
  53 #include "config.h"
  54 #include "video_out.h"
  55 #include "video_out_internal.h"
  56 #include "fastmemcpy.h"
  57 #include "osdep/getch2.h"
  58
  59 #include "sub/sub.h"
  60
  61 #include "mp_msg.h"
  62 //#include "mp_image.h"
  63
  64 #include <assert.h>
  65
  66 static int query_format(uint32_t format);
  67 static void draw_alpha(int x0, int y0, int w, int h, unsigned char *src,
  68                        unsigned char *srca, int stride);
  69 static uint32_t get_image(mp_image_t *mpi);
  70
  71 #define MAXPAGES 16
  72 #define PAGE_EMPTY 0
  73 #define PAGE_BUSY 1
  74
  75 #define CAP_ACCEL_CLEAR 8
  76 #define CAP_ACCEL_PUTIMAGE 4
  77 #define CAP_ACCEL_BACKGR 2
  78 #define CAP_LINEAR 1
  79
  80 static uint8_t zerobuf[8192];//used when clear screen with vga_draw
  81
  82 static int squarepix;
  83 static int force_vm=0;
  84 static int force_native=0;
  85 static int sync_flip=0;
  86 static int blackbar_osd=0;
  87 static int cpage,max_pages,old_page;
  88
  89 static vga_modeinfo * modeinfo;
  90 static int mode_stride; //keep it in case of vga_setlogicalwidth
  91 static int stride_granularity; //not yet used
  92 static int mode_bpp;
  93 static int mode_capabilities;
  94
  95 static int image_width,image_height; // used by OSD
  96 static int x_pos, y_pos;
  97
  98 static struct {
  99     int yoffset;//y position of the page
 100     int doffset;//display start of the page
 101     uint8_t * vbase;//memory start address of the page
 102     int locks;
 103 }PageStore[MAXPAGES];
 104
 105 static const vo_info_t info = {
 106     "SVGAlib",
 107     "svga",
 108     "Ivan Kalvachev <iive@users.sf.net>",
 109     ""
 110 };
 111
 112 LIBVO_EXTERN(svga)
 113
 114
 115 //return number of 1'st free page or -1 if no free one
 116 static inline int page_find_free(void){
 117     int i;
 118     for(i=0;i<max_pages;i++)
 119         if(PageStore[i].locks == PAGE_EMPTY) return i;
 120     return -1;
 121 }
 122
 123 static int preinit(const char *arg)
 124 {
 125     int i,rez;
 126     char s[64];
 127
 128     getch2_disable();
 129     memset(zerobuf,0,sizeof(zerobuf));
 130     force_vm=force_native=squarepix=0;
 131     sync_flip=vo_vsync;
 132     blackbar_osd=0;
 133
 134     if(arg)while(*arg) {
 135         if(!strncmp(arg,"sq",2)) {
 136             squarepix=1;
 137             arg+=2;
 138             if( *arg == ':' ) arg++;
 139         }
 140
 141         if(!strncmp(arg,"native",6)) {
 142             force_native=1;
 143             arg+=6;
 144             if( *arg == ':' ) arg++;
 145         }
 146
 147         if(!strncmp(arg,"bbosd",5)) {
 148             blackbar_osd=1;
 149             arg+=5;
 150             if( *arg == ':' ) arg++;
 151         }
 152
 153         if(!strncmp(arg,"retrace",7)) {
 154             sync_flip=1;
 155             arg+=7;
 156             if( *arg == ':' ) arg++;
 157         }
 158
 159         if(*arg) {
 160             i=0;
 161             while(arg[i] && arg[i]!=':')i++;
 162             if(i<64){
 163                 strncpy(s, arg, i);
 164                 s[i]=0;
 165
 166                 force_vm=vga_getmodenumber(s);
 167                 if(force_vm>0) {
 168                     mp_msg(MSGT_VO,MSGL_V, "vo_svga: Forcing mode %i\n",force_vm);
 169                 }else{
 170                     force_vm = 0;
 171                 }
 172             }
 173             arg+=i;
 174             if(*arg==':')arg++;
 175         }
 176     }
 177
 178     rez = vga_init();
 179     if(rez != 0){
 180         mp_msg(MSGT_VO,MSGL_ERR, "vo_svga: vga_init() returned error=%d\n",rez);
 181     }
 182     return !!rez;
 183 }
 184
 185 static void svga_clear_box(int x,int y,int w,int h){
 186     uint8_t * rgbplane;
 187     int i;
 188
 189     if (mode_capabilities&CAP_ACCEL_CLEAR){
 190         mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: clearing box %d,%d - %d,%d with HW acceleration\n",
 191                x,y,w,h);
 192         if(mode_capabilities&CAP_ACCEL_BACKGR)
 193             vga_accel(ACCEL_SYNC);
 194         vga_accel(ACCEL_SETFGCOLOR,0);//black
 195         vga_accel(ACCEL_FILLBOX,x,y,w,h);
 196         return;
 197     }
 198     if (mode_capabilities & CAP_LINEAR){
 199         mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: clearing box %d,%d - %d,%d with memset\n",x,y,w,h);
 200         rgbplane=PageStore[0].vbase + (y*mode_stride) + (x*modeinfo->bytesperpixel);
 201         for(i=0;i<h;i++){
 202 //i'm afraid that memcpy is better optimized than memset;)
 203             fast_memcpy(rgbplane,zerobuf,w*modeinfo->bytesperpixel);
 204 //    memset(rgbplane,0,w*modeinfo->bytesperpixel);
 205             rgbplane+=mode_stride;
 206         }
 207         return;
 208     }
 209     //native
 210     mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: clearing box %d,%d - %d,%d with native draw \n",x,y,w,h);
 211     if(modeinfo->bytesperpixel!=0) w*=modeinfo->bytesperpixel;
 212     for(i=0;i<h;i++){
 213         vga_drawscansegment(zerobuf,x,y+i,w);
 214     }
 215 };
 216
 217 static uint32_t svga_draw_image(mp_image_t *mpi){
 218     int i,x,y,w,h;
 219     int stride;
 220     uint8_t *rgbplane, *base;
 221     int bytesperline;
 222     int page;
 223
 224     if(mpi->flags & MP_IMGFLAG_DIRECT){
 225         mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: drawing direct rendered surface\n");
 226         cpage=(uint32_t)mpi->priv;
 227         assert((cpage>=0)&&(cpage<max_pages));
 228         return VO_TRUE; //it's already done
 229     }
 230 //  if (mpi->flags&MP_IMGFLAGS_DRAWBACK)
 231 //  return VO_TRUE;//direct render method 2
 232
 233 //find a free page to draw into
 234 //if there is no one then use the current one
 235     page = page_find_free();
 236     if(page>=0) cpage=page;
 237     PageStore[cpage].locks=PAGE_BUSY;
 238
 239 // these variables are used in loops
 240     x = mpi->x;
 241     y = mpi->y;
 242     w = mpi->w;
 243     h = mpi->h;
 244     stride = mpi->stride[0];
 245     rgbplane = mpi->planes[0] + y*stride + (x*mpi->bpp)/8;
 246     x+=x_pos;//center
 247     y+=y_pos;
 248
 249     if(mpi->bpp >= 8){//for modes<8 use only native
 250         if( (mode_capabilities&CAP_ACCEL_PUTIMAGE) && (x==0) && (w==mpi->width) &&
 251             (stride == mode_stride) ){ //only monolite image can be accelerated
 252             w=(stride*8)/mpi->bpp;//we transfer pixels in the stride so the source
 253 //ACCELERATE
 254             mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: using HW PutImage (x=%d,y=%d,w=%d,h=%d)\n",x,y,w,h);
 255             if(mode_capabilities & CAP_ACCEL_BACKGR)
 256                 vga_accel(ACCEL_SYNC);
 257
 258             vga_accel(ACCEL_PUTIMAGE,x,y+PageStore[cpage].yoffset,w,h,rgbplane);
 259             return VO_TRUE;
 260         }
 261
 262         if( mode_capabilities&CAP_LINEAR){
 263 //DIRECT
 264             mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: using Direct memcpy (x=%d,y=%d,w=%d,h=%d)\n",x,y,w,h);
 265             bytesperline=(w*mpi->bpp)/8;
 266             base=PageStore[cpage].vbase + (y*mode_stride) + (x*mpi->bpp)/8;
 267
 268             for(i=0;i<h;i++){
 269                 mem2agpcpy(base,rgbplane,bytesperline);
 270                 base+=mode_stride;
 271                 rgbplane+=stride;
 272             }
 273             return VO_TRUE;
 274         }
 275     }//(modebpp>=8
 276
 277
 278 //NATIVE
 279     {
 280         int length;
 281         length=(w*mpi->bpp)/8;
 282         //one byte per pixel! svgalib innovation
 283         if(mpi->imgfmt==IMGFMT_RG4B || mpi->imgfmt==IMGFMT_BG4B) length=w;
 284
 285         mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: using Native vga_draw(x=%d,y=%d,w=%d,h=%d)\n",x,y,w,h);
 286         y+=PageStore[cpage].yoffset;//y position of the page beggining
 287         for(i=0;i<h;i++){
 288             vga_drawscansegment(rgbplane,x,y+i,length);
 289             rgbplane+=stride;
 290         }
 291     }
 292     return VO_TRUE;
 293 }
 294
 295 static int bpp_from_vminfo(vga_modeinfo *vminfo){
 296     switch(vminfo->colors){
 297         case 2: return 1;
 298         case 16: return 4;
 299         case 256: return 8;
 300         case 32768: return 15;
 301         case 65536: return 16;
 302         case 1<<24: return 8*vminfo->bytesperpixel;
 303     }
 304     return 0;
 305 }
 306
 307 static int find_best_svga_mode(int req_w,int req_h, int req_bpp){
 308     int badness,prev_badness;
 309     int bestmode,lastmode;
 310     int i;
 311     vga_modeinfo *vminfo;
 312 //int best aspect mode // best linear mode // best normal mode (no modeX)
 313
 314     prev_badness = 0;//take care of special case below
 315     bestmode = 0; //0 is the TEXT mode
 316     lastmode = vga_lastmodenumber();
 317     for(i=1;i<=lastmode;i++){
 318         vminfo = vga_getmodeinfo(i);
 319         if( vminfo == NULL ) continue;
 320         mp_msg(MSGT_VO,MSGL_DBG4, "vo_svga: testing mode %d (%s)\n",i,vga_getmodename(i));
 321         if( vga_hasmode(i) == 0 ) continue;
 322         if( req_bpp != bpp_from_vminfo(vminfo) )continue;
 323         if( (vminfo->width < req_w) || (vminfo->height < req_h) ) continue;
 324             badness=(vminfo->width * vminfo->height) - (req_h * req_w);
 325         //put here aspect calculations
 326         if(squarepix)
 327             if( vminfo->width*3 != vminfo->height*4 ) continue;
 328
 329         if( bestmode==0 || prev_badness >= badness ){//modeX etc...
 330             prev_badness=badness;
 331             bestmode=i;
 332             mp_msg(MSGT_VO,MSGL_DBG4, "vo_svga: found good mode %d with badness %d\n",i,badness);
 333         }
 334     }
 335     return bestmode;
 336 }
 337
 338 static int control(uint32_t request, void *data)
 339 {
 340     switch (request) {
 341         case VOCTRL_QUERY_FORMAT:
 342             return query_format(*((uint32_t*)data));
 343         case VOCTRL_DRAW_IMAGE:
 344             return svga_draw_image( (mp_image_t *)data);
 345         case VOCTRL_GET_IMAGE:
 346             return get_image(data);
 347     }
 348
 349     return VO_NOTIMPL;
 350 }
 351
 352 //
 353 // This function is called to init the video driver for specific mode
 354 //
 355 static int config(uint32_t width, uint32_t height, uint32_t d_width,
 356                        uint32_t d_height, uint32_t flags, char *title,
 357                        uint32_t format) {
 358     int32_t req_w = width;// (d_width > 0 ? d_width : width);
 359     int32_t req_h = height;// (d_height > 0 ? d_height : height);
 360     uint16_t vid_mode = 0;
 361     int32_t req_bpp;
 362
 363     uint32_t accflags;
 364     mp_msg(MSGT_VO,MSGL_V, "vo_svga: config(%i, %i, %i, %i, %08x, %s, %08x)\n", width, height,
 365            d_width, d_height, flags, title, format);
 366 //Only RGB modes supported
 367     if (!IMGFMT_IS_RGB(format) && !IMGFMT_IS_BGR(format)) {assert(0);return -1;}
 368     req_bpp = IMGFMT_BGR_DEPTH(format);
 369
 370     if( vo_dbpp!=0 && vo_dbpp!=req_bpp) {assert(0);return-1;}
 371
 372     if(!force_vm) {
 373         mp_msg(MSGT_VO,MSGL_V, "vo_svga: Looking for the best resolution...\n");
 374         mp_msg(MSGT_VO,MSGL_V, "vo_svga: req_w: %d, req_h: %d, bpp: %d\n",req_w,req_h,req_bpp);
 375         vid_mode=find_best_svga_mode(req_w,req_h,req_bpp);
 376         if(vid_mode==0)
 377             return 1;
 378         modeinfo=vga_getmodeinfo(vid_mode);
 379     }else{//force_vm
 380         vid_mode=force_vm;
 381         if(vga_hasmode(vid_mode) == 0){
 382             mp_tmsg(MSGT_VO,MSGL_ERR, "[VO_SVGA] Forced vid_mode %d (%s) not available.\n",
 383                    vid_mode,vga_getmodename(vid_mode));
 384             return 1; //error;
 385         }
 386         modeinfo=vga_getmodeinfo(vid_mode);
 387         if( (modeinfo->width < req_w) || (modeinfo->height < req_h) ){
 388             mp_tmsg(MSGT_VO,MSGL_ERR, "[VO_SVGA] Forced vid_mode %d (%s) too small.\n",
 389                    vid_mode,vga_getmodename(vid_mode));
 390             return 1;
 391         }
 392     }
 393     mode_bpp=bpp_from_vminfo(modeinfo);
 394
 395     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] Vid_mode: %d, %dx%d %dbpp.\n",
 396            vid_mode,modeinfo->width,modeinfo->height,mode_bpp);
 397
 398     if (vga_setmode(vid_mode) == -1) {
 399         mp_tmsg(MSGT_VO,MSGL_ERR, "[VO_SVGA] Vga_setmode(%d) failed.\n",vid_mode);
 400         uninit();
 401         return 1; // error
 402     }
 403     /* set 332 palette for 8 bpp */
 404     if(mode_bpp==8){
 405         int i;
 406         for(i=0; i<256; i++)
 407             vga_setpalette(i, ((i>>5)&7)*9, ((i>>2)&7)*9, (i&3)*21);
 408     }
 409     /* set 121 palette for 4 bpp */
 410     else if(mode_bpp==4){
 411         int i;
 412         for(i=0; i<16; i++)
 413         vga_setpalette(i, ((i>>3)&1)*63, ((i>>1)&3)*21, (i&1)*63);
 414     }
 415     //if we change the logical width, we should know the granularity
 416     stride_granularity=8;//according to man vga_logicalwidth
 417     if(modeinfo->flags & EXT_INFO_AVAILABLE){
 418         stride_granularity=modeinfo->linewidth_unit;
 419     }
 420     //look for hardware acceleration
 421     mode_capabilities=0;//NATIVE;
 422     if(!force_native){//if we want to use only native drawers
 423         if(modeinfo->flags & HAVE_EXT_SET){//support for hwaccel interface
 424             accflags=vga_ext_set(VGA_EXT_AVAILABLE,VGA_AVAIL_ACCEL);
 425             if(accflags & ACCELFLAG_FILLBOX) // clear screen
 426                 mode_capabilities|=CAP_ACCEL_CLEAR;
 427             if(accflags & ACCELFLAG_PUTIMAGE)//support for mem->vid transfer
 428                 mode_capabilities|=CAP_ACCEL_PUTIMAGE;
 429             if((accflags & ACCELFLAG_SETMODE) && (accflags & ACCELFLAG_SYNC)){
 430                 vga_accel(ACCEL_SETMODE,BLITS_IN_BACKGROUND);
 431                 mode_capabilities|=CAP_ACCEL_BACKGR;//can draw in backgraund
 432             }
 433         }
 434         if(modeinfo->flags & IS_LINEAR){
 435             mode_capabilities|=CAP_LINEAR; //don't use bank & vga_draw
 436         }
 437         else{
 438             if(modeinfo->flags & CAPABLE_LINEAR){
 439                 int vid_mem_size;
 440                 vid_mem_size = vga_setlinearaddressing();
 441                 if(vid_mem_size != -1){
 442                     modeinfo=vga_getmodeinfo(vid_mode);//sometimes they change parameters
 443                     mode_capabilities|=CAP_LINEAR;
 444                 }
 445             }
 446         }
 447     }//fi force native
 448     if(mode_capabilities&CAP_LINEAR){
 449         mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] Video mode is linear and memcpy could be used for image transfer.\n");
 450     }
 451     if(mode_capabilities&CAP_ACCEL_PUTIMAGE){
 452         mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] Video mode has hardware acceleration and put_image could be used.\n");
 453         mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] If it works for you I would like to know.\n[VO_SVGA] (send log with `mplayer test.avi -v -v -v -v &> svga.log`). Thx!\n");
 454     }
 455
 456 //here is the place to handle strides for accel_ modes;
 457     mode_stride=modeinfo->linewidth;
 458 //we may try to set a bigger stride for video mode that will match the mpi->stride,
 459 //this way we will transfer more data, but HW put_image can do it in backgraund!
 460
 461 //now let's see how many pages we can use
 462     max_pages = modeinfo->maxpixels/(modeinfo->height * modeinfo->width);
 463     if(max_pages > MAXPAGES) max_pages = MAXPAGES;
 464     if(!vo_doublebuffering) max_pages=1;
 465 //fill PageStore structs
 466     {
 467         int i;
 468         uint8_t * GRAPH_MEM;
 469         int dof;
 470         GRAPH_MEM=vga_getgraphmem();
 471         for(i=0;i<max_pages;i++){
 472             //calculate display offset
 473             dof = i * modeinfo->height * modeinfo->width;
 474             if(modeinfo->bytesperpixel != 0) dof*=modeinfo->bytesperpixel;
 475             //check video chip limitations
 476             if( dof != (dof & modeinfo->startaddressrange) ){
 477                 max_pages=i;//page 0 will never come here
 478                 break;
 479             }
 480             PageStore[i].yoffset = i * modeinfo->height;//starting y offset
 481             PageStore[i].vbase = GRAPH_MEM + i*modeinfo->height*mode_stride; //memory base address
 482             PageStore[i].doffset = dof; //display offset
 483             PageStore[i].locks = PAGE_EMPTY;
 484         }
 485     }
 486     assert(max_pages>0);
 487     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] Video mode has %d page(s).\n",max_pages);
 488     //15bpp
 489     if(modeinfo->bytesperpixel!=0)
 490         vga_claimvideomemory(max_pages * modeinfo->height * modeinfo->width * modeinfo->bytesperpixel);
 491     else
 492         vga_claimvideomemory(max_pages * modeinfo->height * modeinfo->width * mode_bpp / 8);
 493
 494     cpage=old_page=0;
 495     svga_clear_box(0,0,modeinfo->width,modeinfo->height * max_pages);
 496
 497     image_height=req_h;
 498     image_width=req_w;
 499     x_pos = (modeinfo->width  - req_w) / 2;
 500     y_pos = (modeinfo->height - req_h) / 2;
 501     x_pos &= ~(15); //align x offset position to 16 pixels
 502     mp_tmsg(MSGT_VO,MSGL_INFO, "[VO_SVGA] Centering image. Starting at (%d,%d)\n",x_pos,y_pos);
 503
 504     vga_setdisplaystart(0);
 505     return 0;
 506 }
 507
 508 static int draw_slice(uint8_t *image[],int stride[],
 509                int w, int h, int x, int y) {
 510     assert(0);
 511     return VO_ERROR;//this is yv12 only -> vf_scale should do all transforms
 512 }
 513
 514 static int draw_frame(uint8_t *src[]) {
 515     assert(0);
 516     return VO_ERROR;//this one should not be called
 517 }
 518
 519 static void draw_osd(void)
 520 {
 521     mp_msg(MSGT_VO,MSGL_DBG4, "vo_svga: draw_osd()\n");
 522     //only modes with bytesperpixel>0 can draw OSD
 523     if(modeinfo->bytesperpixel==0) return;
 524     if(!(mode_capabilities&CAP_LINEAR)) return;//force_native will remove OSD
 525
 526     if(blackbar_osd){
 527 //111
 528 //3 4
 529 //222
 530         svga_clear_box(0,0 + PageStore[cpage].yoffset,
 531                        modeinfo->width, y_pos);
 532         svga_clear_box(0, image_height + y_pos + PageStore[cpage].yoffset,
 533                        modeinfo->width, modeinfo->height-(image_height+ y_pos));
 534         svga_clear_box(0, y_pos + PageStore[cpage].yoffset,
 535                        x_pos, image_height);
 536         svga_clear_box(image_width + x_pos, y_pos + PageStore[cpage].yoffset,
 537                        modeinfo->width-(x_pos+image_width), image_height);
 538 //    vo_remove_text(modeinfo->width, modeinfo->height, clear_alpha);
 539         vo_draw_text(modeinfo->width, modeinfo->height, draw_alpha);
 540     }else{
 541         vo_draw_text(image_width, image_height, draw_alpha);
 542     }
 543 }
 544
 545 static void flip_page(void) {
 546     PageStore[old_page].locks=PAGE_EMPTY;
 547     PageStore[cpage].locks=PAGE_BUSY;
 548
 549     mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: viewing page %d\n",cpage);
 550     if(sync_flip && old_page!=cpage){
 551         mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga:vga_waitretrace\n");
 552         vga_waitretrace();
 553     }
 554     vga_setdisplaystart(PageStore[cpage].doffset);
 555
 556     old_page=cpage;//cpage will be overwriten on next draw_image
 557 }
 558
 559 static void check_events(void) {
 560 }
 561
 562 static void uninit(void) {
 563     vga_setmode(TEXT);
 564 }
 565
 566 /* --------------------------------------------------------------------- */
 567 static int query_format(uint32_t format) {
 568     int32_t req_bpp,flags;
 569     int i,lastmode;
 570     vga_modeinfo * vminfo;
 571
 572     mp_msg(MSGT_VO,MSGL_DBG4, "vo_svga: query_format=%X \n",format);
 573 //only RGB modes supported
 574     if( (!IMGFMT_IS_RGB(format)) && (!IMGFMT_IS_BGR(format)) ) return 0;
 575
 576 // Reject different endian
 577 #if HAVE_BIGENDIAN
 578     if (IMGFMT_IS_BGR(format)) return 0;
 579 #else
 580     if (IMGFMT_IS_RGB(format)) return 0;
 581 #endif
 582
 583     //svgalib supports only BG4B! if we want BGR4 we have to emulate it (sw)
 584     if( format==IMGFMT_BGR4 || format==IMGFMT_RGB4) return 0;
 585     req_bpp = IMGFMT_RGB_DEPTH(format);
 586     if( vo_dbpp>0 && vo_dbpp!=req_bpp ) return 0; //support -bpp options
 587 //scan all modes
 588     lastmode = vga_lastmodenumber();
 589     for(i=1;i<=lastmode;i++){
 590         vminfo = vga_getmodeinfo(i);
 591         if( vminfo == NULL ) continue;
 592         if( vga_hasmode(i) == 0 ) continue;
 593         if( req_bpp != bpp_from_vminfo(vminfo) ) continue;
 594         if( (force_vm > 0) && (force_vm != i) )  continue;//quick hack
 595         flags = VFCAP_CSP_SUPPORTED|
 596                 VFCAP_CSP_SUPPORTED_BY_HW|
 597                 VFCAP_ACCEPT_STRIDE|
 598                 0;
 599         if(req_bpp>8) flags|=VFCAP_OSD;
 600         return flags;
 601     }
 602     return 0;
 603 }
 604
 605 static void draw_alpha(int x0, int y0, int w, int h, unsigned char *src,
 606                        unsigned char *srca, int stride) {
 607     char* base;
 608
 609     mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: draw_alpha(x0=%d,y0=%d,w=%d,h=%d,src=%p,srca=%p,stride=%d\n",
 610            x0,y0,w,h,src,srca,stride);
 611     if(!blackbar_osd) {
 612         //drawing in the image, so place the stuff there
 613         x0+=x_pos;
 614         y0+=y_pos;
 615     }
 616
 617     mp_msg(MSGT_VO,MSGL_DBG4, "vo_svga: OSD draw in page %d\n",cpage);
 618     base=PageStore[cpage].vbase + y0*mode_stride + x0*modeinfo->bytesperpixel;
 619     switch (mode_bpp) {
 620         case 32:
 621             vo_draw_alpha_rgb32(w, h, src, srca, stride, base, mode_stride);
 622             break;
 623         case 24:
 624             vo_draw_alpha_rgb24(w, h, src, srca, stride, base, mode_stride);
 625             break;
 626         case 16:
 627             vo_draw_alpha_rgb16(w, h, src, srca, stride, base, mode_stride);
 628             break;
 629         case 15:
 630             vo_draw_alpha_rgb15(w, h, src, srca, stride, base, mode_stride);
 631             break;
 632     }
 633 }
 634
 635 static uint32_t get_image(mp_image_t *mpi){
 636     int page;
 637
 638     if(!IMGFMT_IS_BGR(mpi->imgfmt) && !IMGFMT_IS_RGB(mpi->imgfmt) ){
 639         assert(0);//should never happen
 640         return VO_FALSE;
 641     }
 642
 643     if (
 644         ( (mpi->type != MP_IMGTYPE_STATIC) && (mpi->type != MP_IMGTYPE_TEMP)) ||
 645         (mpi->flags & MP_IMGFLAG_PLANAR) ||
 646         (mpi->flags & MP_IMGFLAG_YUV)
 647        )
 648     return VO_FALSE;
 649
 650 //reading from video memory is horribly slow
 651     if( !(mpi->flags & MP_IMGFLAG_READABLE) && vo_directrendering &&
 652         (mode_capabilities & CAP_LINEAR) ){
 653
 654 //find free page and reserve it
 655         page=page_find_free();
 656         if(page >= 0){
 657             PageStore[page].locks=PAGE_BUSY;
 658
 659             mpi->flags |= MP_IMGFLAG_DIRECT;
 660             mpi->stride[0] = mode_stride;
 661             mpi->planes[0] = PageStore[page].vbase +
 662                              y_pos*mode_stride + (x_pos*mpi->bpp)/8;
 663             mpi->priv=(void *)page;
 664             mp_msg(MSGT_VO,MSGL_DBG3, "vo_svga: direct render allocated! page=%d\n",page);
 665             return VO_TRUE;
 666         }
 667     }
 668
 669     return VO_FALSE;
 670 }