ref: df634b2ca4bd940a61946a3bbda3881bed1a09d6
dir: /egdi.c/
/*
* [MS-RDPEGDI]: Graphics Device Interface (GDI) Acceleration Extensions
* http://msdn.microsoft.com/en-us/library/cc241537.aspx
*/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
enum
{
Bits2= 3,
Bits3= 7,
Bits6= 63,
Bits7= 127,
Bits8= 255,
};
enum /* 2.2.2.2.1 Drawing Order (DRAWING_ORDER) */
{
Standard= 1<<0,
Secondary= 1<<1,
};
enum /* 2.2.2.2.1.1.2 Primary Drawing Order (PRIMARY_DRAWING_ORDER) */
{
Clipped= 1<<2,
NewOrder= 1<<3,
Diff= 1<<4,
SameClipping= 1<<5,
ZeroFieldBit0= 1<<6,
ZeroFieldBit1= 1<<7,
};
enum
{
ROP2_COPY = 0xcc,
};
enum
{
/* orderSupport indices for capability negotiation */
CanDstBlt = 0,
CanPatBlt, /* also OpaqueRect */
CanScrBlt,
CanMemBlt = 3,
CanMem3Blt,
CanDrawNineGrid = 7,
CanLineTo,
CanMultiDrawNineGrid,
CanSaveBitmap = 0x0B,
CanMultiDstBlt = 0x0F,
CanMultiPatBlt = 0x10,
CanMultiScrBlt,
CanMultiOpaqueRect,
CanFastIndex,
CanPolygonSC, /* also PolygonCB */
CanPolygonCB, /* also PolygonCB */
CanPolyline,
CanFastGlyph = 0x18,
CanEllipseSC, /* also EllipseCB */
CanEllipseCB, /* also EllipseSC */
CanGlyphIndex,
};
enum
{
/* 2.2.2.2.1.1.2 Primary Drawing Order (PRIMARY_DRAWING_ORDER) */
PatBlt=1,
ScrBlt=2,
OpaqueRect=10,
MemBlt=13,
MultiOpaqueRect=18,
};
enum
{
/* 2.2.2.2.1.2.1.1 Secondary Drawing Order Header */
CacheImage = 0,
CacheCmap,
CacheCompressed,
CacheGlyph,
CacheImage2,
CacheCompressed2,
CacheBrush = 7,
CacheCompressed3,
};
typedef struct Order Order;
struct Order
{
int fsize;
uchar* (*fn)(Rdp*, uchar*,uchar*,int,int);
};
static uchar* scrblt(Rdp*, uchar*,uchar*,int,int);
static uchar* memblt(Rdp*, uchar*,uchar*,int,int);
static uchar* cacheimage2(Rdp*, uchar*,uchar*,int,int);
static uchar* cacheimage(Rdp*, uchar*,uchar*,int,int);
static uchar* cachecmap(Rdp*, uchar*,uchar*,int,int);
Order ordtab[NumOrders] = {
[ScrBlt]= { 1, scrblt },
[MemBlt]= { 2, memblt },
[PatBlt]= { 2, nil },
[OpaqueRect]= { 1, nil },
[MultiOpaqueRect]= { 2, nil },
};
Order auxtab[8] = {
[CacheImage2]= { 0, cacheimage2 },
[CacheCompressed2]= { 0, cacheimage2 },
[CacheImage]= { 0, cacheimage },
[CacheCompressed]= { 0, cacheimage },
[CacheCmap]= { 0, cachecmap },
};
uchar
orderSupport[NumOrders] =
{
[CanScrBlt] 1,
[CanMemBlt] 1,
// [CanMultiOpaqueRect] 1,
// [CanPatBlt] 1, /* and OpaqueRect */
};
static struct GdiContext
{
int order;
Rectangle clipr;
} gc = {PatBlt};
static Image* imgcache[3][600];
static uchar* getclipr(Rectangle*,uchar*,uchar*);
static uchar* getpt(Point*,uchar*,uchar*,int,int);
/* 2.2.2.2 Fast-Path Orders Update (TS_FP_UPDATE_ORDERS) */
void
scanorders(Rdp* c, Share* as)
{
int count;
uchar *p, *ep;
int ctl, fmask, fsize;
int size, opt, xorder;
count = as->nord;
p = as->data;
ep = as->data + as->ndata;
while(count-- > 0 && p<ep){
fmask = 0;
ctl = *p;
if(!(ctl&Standard))
goto ErrNstd; // GDI+ or out of sync
if(ctl&Secondary){
if(p+6>ep)
sysfatal("scanorders: %s", Eshort);
size = ((short)GSHORT(p+1))+13;
if(size < 0 || p+size > ep)
sysfatal("scanorders: size: %s", Eshort);
opt = GSHORT(p+3);
xorder = p[5];
if(xorder >= nelem(auxtab) || auxtab[xorder].fn == nil){
fprint(2, "egdi: unsupported secondary order %d\n", xorder);
p += size;
continue;
}
auxtab[xorder].fn(c, p, p+size, xorder, opt);
p += size;
continue;
}
p++;
if(ctl&NewOrder){
gc.order = *p++;
if(gc.order >= NumOrders) // paranoia
gc.order = PatBlt;
}
fsize = ordtab[gc.order].fsize - ((ctl>>6)&Bits2);
switch(fsize){
default:
goto ErrFsize;
case 3:
fmask = p[0]|(p[1]<<8)|(p[2]<<16);
break;
case 2:
fmask = GSHORT(p);
break;
case 1:
fmask = p[0];
case 0:
break;
}
p += fsize;
if(ctl&Clipped && !(ctl&SameClipping))
p = getclipr(&gc.clipr, p, ep);
if(ordtab[gc.order].fn == nil)
goto ErrNotsup;
p = ordtab[gc.order].fn(c, p, ep, ctl, fmask);
if(p == nil)
break;
}
lockdisplay(display);
flushimage(display, 1);
unlockdisplay(display);
return;
ErrNstd:
fprint(2, "egdi: non-standard order\n");
return;
ErrFsize:
fprint(2, "egdi: bad field encoding bytes count for order %d\n", gc.order);
return;
ErrNotsup:
fprint(2, "egdi: unsupported order %d\n", gc.order);
return;
}
static uchar*
getclipr(Rectangle* pr, uchar* p, uchar* ep)
{
int bctl;
bctl = *p++;
if(bctl&1<<4)
pr->min.x += (char)*p++;
else if(bctl&1<<0){
pr->min.x = GSHORT(p);
p += 2;
}
if(bctl&1<<5)
pr->min.y += (char)*p++;
else if(bctl&1<<1){
pr->min.y = GSHORT(p);
p += 2;
}
if(bctl&1<<6)
pr->max.x += (char)*p++;
else if(bctl&1<<2){
pr->max.x = GSHORT(p)+1;
p += 2;
}
if(bctl&1<<7)
pr->max.y += (char)*p++;
else if(bctl&1<<3){
pr->max.y = GSHORT(p)+1;
p += 2;
}
if(p>ep)
sysfatal("getclipr: %s", Eshort);
return p;
}
static uchar*
getpt(Point* pp, uchar* s, uchar *es, int ctl, int fmask)
{
Point p;
p = *pp;
if(ctl&Diff){
if(fmask&1<<0)
p.x += (char)*s++;
if(fmask&1<<1)
p.y += (char)*s++;
}else{
if(fmask&1<<0){
p.x = GSHORT(s);
s += 2;
};
if(fmask&1<<1){
p.y = GSHORT(s);
s += 2;
};
}
if(s > es)
sysfatal("getpt: %s", Eshort);
*pp = p;
return s;
}
static uchar*
getoffrect(Rectangle* pr, uchar* p, uchar* ep, int ctl, int fmask){
Rectangle r;
r = *pr;
r.max = subpt(r.max, r.min);
p = getpt(&r.min, p, ep, ctl, fmask);
p = getpt(&r.max, p, ep, ctl, fmask>>2);
r.max = addpt(r.max, r.min);
*pr = r;
return p;
}
/* 2.2.2.2.1.1.2.7 ScrBlt (SCRBLT_ORDER) */
static uchar*
scrblt(Rdp*, uchar* p, uchar* ep, int ctl, int fmask)
{
static Rectangle r;
static Point pt;
static int rop3;
Rectangle rs;
Point ps;
p = getoffrect(&r, p, ep, ctl, fmask);
if(fmask&1<<4)
rop3 = *p++;
p = getpt(&pt, p, ep, ctl, fmask>>5);
if(rop3 != ROP2_COPY){
fprint(2, "scrblt: rop3 %#hhux is not supported\n", rop3);
return p;
}
rs = r;
if(ctl&Clipped)
rectclip(&rs, gc.clipr); // not replclipr: need to clip dst only
rs = rectaddpt(rs, screen->r.min);
ps = addpt(pt, screen->r.min);
lockdisplay(display);
draw(screen, rs, screen, nil, ps);
unlockdisplay(display);
return p;
}
/* 2.2.2.2.1.1.2.9 MemBlt (MEMBLT_ORDER) */
static uchar*
memblt(Rdp*, uchar* p, uchar* ep, int ctl, int fmask)
{
static int cid; /* cacheId */
static int coff; /* cacheIndex */
static int rop3;
static Rectangle r;
static Point pt;
Image* img;
if(fmask&1<<0){
cid = GSHORT(p);
p += 2;
}
p = getoffrect(&r, p, ep, ctl, fmask>>1);
if(fmask&1<<5)
rop3 = *p++;
p = getpt(&pt, p, ep, ctl, fmask>>6);
if(fmask&1<<8){
coff = GSHORT(p);
p += 2;
}
if(p>ep)
sysfatal("memblt: %s", Eshort);
cid &= Bits8;
if(cid >= nelem(imgcache) || coff >= nelem(*imgcache)){
fprint(2, "memblt: bad image cache spec [%d %d]\n", cid, coff);
return p;
}
img = imgcache[cid][coff];
if(img == nil){
fprint(2, "memblt: empty cache entry cid %d coff %d\n", cid, coff);
return p;
}
lockdisplay(display);
if(ctl&Clipped)
replclipr(screen, screen->repl, rectaddpt(gc.clipr, screen->r.min));
draw(screen, rectaddpt(r, screen->r.min), img, nil, pt);
if(ctl&Clipped)
replclipr(screen, screen->repl, screen->r);
unlockdisplay(display);
return p;
}
static Image*
pickimage(int cid, int coff, Rectangle r, ulong chan)
{
Image* img;
if(cid >= nelem(imgcache) || coff >= nelem(*imgcache)){
werrstr("bad image cache spec [%d %d]", cid, coff);
return nil;
}
img = imgcache[cid][coff];
if(img==nil || !eqrect(img->r, r)){
if(img != nil)
freeimage(img);
img = allocimage(display, r, chan, 0, DNofill);
if(img == nil)
sysfatal("%r");
imgcache[cid][coff] = img;
}
return img;
}
/* 2.2.2.2.1.2.2 Cache Bitmap - Revision 1 (CACHE_BITMAP_ORDER) */
static uchar*
cacheimage(Rdp* c, uchar* p, uchar* ep, int xorder, int opt)
{
int cid; /* cacheId */
int coff; /* cacheIndex */
int chan;
int zip;
int err;
int size;
Image* img;
Point d; /* width, height */
Rectangle r;
if(p+15 >= ep)
sysfatal("cacheimage: %s", Eshort);
cid = p[6];
d.x = p[8];
d.y = p[9];
size = GSHORT(p+11);
coff = GSHORT(p+13);
r.min = ZP;
r.max = d;
chan = c->chan;
zip = (xorder==CacheCompressed);
if(zip)
if(opt&1<<10){
p += 8; // bitmapComprHdr
size -= 8;
}
if(p+size > ep)
sysfatal("cacheimage: size: %s", Eshort);
if((img = pickimage(cid, coff, r, chan)) == nil)
sysfatal("pickimage: %r");
err = (zip? loadrle : loadbmp)(img, r, p, size, c->cmap);
if(err < 0)
sysfatal("%r");
return p+size;
}
/* 2.2.2.2.1.2.3 Cache Bitmap - Revision 2 (CACHE_BITMAP_REV2_ORDER) */
static uchar*
cacheimage2(Rdp* c, uchar* p,uchar* ep, int xorder, int opt)
{
int n, g;
int zip;
int cid; /* cacheId */
int coff; /* cacheIndex */
int chan;
int size;
int err;
Image* img;
Point d;
Rectangle r;
if(p+9 >= ep)
sysfatal("cacheimage2: %s", Eshort);
p += 6;
chan = c->chan;
zip = (xorder==CacheCompressed2);
cid = opt&Bits3;
opt >>= 7;
if(opt&1<<1)
p += 8; // persistent cache key
g = *p++;
if(g&1<<7)
g = ((g&Bits7)<<8) | *p++;
d.x = g;
if(opt&1)
d.y = d.x;
else{
g = *p++;
if(g&1<<7)
g = ((g&Bits7)<<8) | *p++;
d.y = g;
}
r.min = ZP;
r.max = d;
g = *p++;
n = g>>6;
g &= Bits6;
switch(n){
default: sysfatal("cacheimage2: integer too big");
case 3: g = (g<<8) | *p++;
case 2: g = (g<<8) | *p++;
case 1: g = (g<<8) | *p++;
}
size = g;
g = *p++;
if(g&1<<7)
g = ((g&Bits7)<<8) | *p++;
coff = g;
if(zip&& !(opt&1<<3)){
p += 8; // bitmapComprHdr
size -= 8;
}
if(p+size > ep)
sysfatal("cacheimage2: size: %s", Eshort);
if((img = pickimage(cid, coff, r, chan)) == nil)
sysfatal("pickimage: %r");
err = (zip? loadrle : loadbmp)(img, r, p, size, c->cmap);
if(err < 0)
sysfatal("%r");
return p+size;
}
/* 2.2.2.2.1.2.4 Cache Color Table (CACHE_COLOR_TABLE_ORDER) */
static uchar*
cachecmap(Rdp*, uchar* p,uchar* ep, int, int)
{
int cid, n;
cid = p[6];
n = GSHORT(p+7);
if(n != 256){
fprint(2, "cachecmap: %d != 256\n", n);
return nil;
}
if(p+9+4*256>ep){
werrstr(Eshort);
return nil;
}
/* fixed cmap here */
USED(cid);
return p+9+4*256;
}