ref: 3befb91804e0aa9022b694c38c33cec0791d9df9
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> /* for geometry */
#include "dat.h"
#include "fns.h"
#define DBG if(0)
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
{
Scopy = 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,
};
static int getscrblt(Imgupd*, uchar*, uint, int, int);
static int getmemblt(Imgupd*, uchar*, uint, int, int);
static int getimgcache2(Imgupd*, uchar*, uint, int, int);
static int getcmapcache(Imgupd*, uchar*, uint, int, int);
typedef struct Order Order;
struct Order
{
int fsize;
int (*get)(Imgupd*,uchar*,uint,int,int);
};
Order ordtab[NumOrders] = {
[ScrBlt]= { 1, getscrblt },
[MemBlt]= { 2, getmemblt },
};
Order auxtab[8] = {
[CacheImage2]= { 0, getimgcache2 },
[CacheCompressed2]= { 0, getimgcache2 },
[CacheCmap]= { 0, getcmapcache },
};
uchar
orderSupport[NumOrders] =
{
[CanScrBlt]= 1,
[CanMemBlt]= 1,
};
static struct GdiContext
{
int order;
Rectangle clipr;
} gc = {PatBlt};
static int cfclipr(Rectangle*,uchar*,int);
static int cfpt(Point*,uchar*,int,int,int);
int
getfupd(Imgupd* up, uchar* a, uint nb)
{
uchar *p, *ep;
int ctl, fset, fsize;
int n, size, opt, xorder;
p = a;
ep = a+nb;
fset = 0;
ctl = *p;
if(!(ctl&Standard))
goto ErrNstd;
if(ctl&Secondary){
if(p+6>ep)
sysfatal("draworders: %s", Eshort);
size = ((short)igets(p+1))+13;
if(size < 0 || p+size > ep)
sysfatal("draworders: size: %s", Eshort);
opt = igets(p+3);
xorder = p[5];
if(xorder >= nelem(auxtab) || auxtab[xorder].get == nil){
fprint(2, "egdi: unsupported secondary order %d\n", xorder);
p += size;
return p-a;
}
auxtab[xorder].get(up, p, size, xorder, opt);
p += size;
return p-a;
}
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:
fset = p[0]|(p[1]<<8)|(p[2]<<16);
break;
case 2:
fset = igets(p);
break;
case 1:
fset = p[0];
case 0:
break;
}
p += fsize;
if(ctl&Clipped && !(ctl&SameClipping))
p += cfclipr(&gc.clipr, p, ep-p);
if(ordtab[gc.order].get == nil)
goto ErrNotsup;
n = ordtab[gc.order].get(up, p, ep-p, ctl, fset);
p += n;
return p-a;
ErrNstd:
fprint(2, "egdi: non-standard order (GDI+ or out of sync)\n");
return p-a;
ErrFsize:
fprint(2, "egdi: bad field encoding bytes count for order %d\n", gc.order);
return p-a;
ErrNotsup:
fprint(2, "egdi: unsupported order %d\n", gc.order);
return p-a;
}
static int
cfpt(Point* p, uchar* a, int nb, int isdelta, int fset)
{
int n;
n = 0;
if(isdelta){
if(fset&1<<0)
n++;
if(fset&1<<1)
n++;
}else{
if(fset&1<<0)
n += 2;
if(fset&1<<1)
n += 2;
}
if(n>nb)
sysfatal("cfpt: %s", Eshort);
if(isdelta){
if(fset&1<<0)
p->x += (signed char)*a++;
if(fset&1<<1)
p->y += (signed char)*a;
}else{
if(fset&1<<0){
p->x = igets(a);
a += 2;
};
if(fset&1<<1)
p->y = igets(a);
}
return n;
}
static int
cfrect(Rectangle* pr, uchar* p, int nb, int isdelta, int fset){
int n, m;
pr->max = subpt(pr->max, pr->min);
n = cfpt(&pr->min, p, nb, isdelta, fset);
m = cfpt(&pr->max, p+n, nb-n, isdelta, fset>>2);
pr->max = addpt(pr->max, pr->min);
return n+m;
}
static int
cfclipr(Rectangle* pr, uchar* a, int nb)
{
int bctl;
uchar *p, *ep;
p = a;
ep = a+nb;
bctl = *p++;
if(bctl&1<<4)
pr->min.x += (char)*p++;
else if(bctl&1<<0){
pr->min.x = igets(p);
p += 2;
}
if(bctl&1<<5)
pr->min.y += (char)*p++;
else if(bctl&1<<1){
pr->min.y = igets(p);
p += 2;
}
if(bctl&1<<6)
pr->max.x += (char)*p++;
else if(bctl&1<<2){
pr->max.x = igets(p)+1;
p += 2;
}
if(bctl&1<<7)
pr->max.y += (char)*p++;
else if(bctl&1<<3){
pr->max.y = igets(p)+1;
p += 2;
}
if(p>ep)
sysfatal("cfclipr: %s", Eshort);
return p-a;
}
/* 2.2.2.2.1.1.2.7 ScrBlt (SCRBLT_ORDER) */
static int
getscrblt(Imgupd* up, uchar* a, uint nb, int ctl, int fset)
{
int n;
uchar *p, *ep;
Rectangle r;
static Rectangle wr;
static Point wp;
static int rop3;
DBG fprint(2, "getscrblt...");
p = a;
ep = a+nb;
n = cfrect(&wr, p, ep-p, ctl&Diff, fset);
p += n;
if(fset&1<<4){
if(ep-p<1)
sysfatal(Eshort);
rop3 = *p++;
}
n = cfpt(&wp, p, ep-p, ctl&Diff, fset>>5);
p += n;
r = wr;
if(ctl&Clipped)
rectclip(&r, gc.clipr);
if(rop3 != Scopy)
fprint(2, "scrblt: rop3 %#hhux is not supported\n", rop3);
up->type = Uscrblt;
up->x = r.min.x;
up->y = r.min.y;
up->xsz = Dx(r);
up->ysz = Dy(r);
up->sx = wp.x;
up->sy = wp.y;
return p-a;
}
static int
getmemblt(Imgupd* up, uchar* a, uint nb, int ctl, int fset)
{
static int cid; /* cacheId */
static int coff; /* cacheIndex */
static int rop3;
static Rectangle r;
static Point pt;
int n;
uchar *p, *ep;
DBG fprint(2, "getmemblt...");
p = a;
ep = a+nb;
if(fset&1<<0){
cid = igets(p);
p += 2;
}
n = cfrect(&r, p, ep-p, ctl&Diff, fset>>1);
p += n;
if(fset&1<<5)
rop3 = *p++;
n = cfpt(&pt, p, ep-p, ctl&Diff, fset>>6);
p += n;
if(fset&1<<8){
coff = igets(p);
p += 2;
}
if(p>ep)
sysfatal("getmemblt: %s", Eshort);
cid &= Bits8;
up->type = Umemblt;
up->cid = cid;
up->coff = coff;
up->x = r.min.x;
up->y = r.min.y;
up->xm = r.max.x-1;
up->ym = r.max.y-1;
up->xsz = Dx(r);
up->ysz = Dy(r);
up->sx = pt.x;
up->sy = pt.y;
up->clipped = 0;
if(ctl&Clipped){
up->clipped = 1;
up->cx = gc.clipr.min.x;
up->cy = gc.clipr.min.y;
up->cxsz = Dx(gc.clipr);
up->cysz = Dy(gc.clipr);
}
return p-a;
}
/* 2.2.2.2.1.2.3 Cache Bitmap - Revision 2 (CACHE_BITMAP_REV2_ORDER) */
static int
getimgcache2(Imgupd* up, uchar* a, uint nb, int xorder, int opt)
{
uchar *p, *ep;
int cid; /* cacheId */
int coff; /* cacheIndex */
int n, g;
int size;
DBG fprint(2, "getimgcache2...");
p = a;
ep = a+nb;
up->iscompr = (xorder==CacheCompressed2);
cid = opt&Bits3;
opt >>= 7;
if(p+9 >= ep)
sysfatal("cacheimage2: %s", Eshort);
p += 6;
if(opt&1<<1)
p += 8; // persistent cache key
g = *p++;
if(g&1<<7)
g = ((g&Bits7)<<8) | *p++;
up->xsz = g;
if(opt&1)
up->ysz = g;
else{
g = *p++;
if(g&1<<7)
g = ((g&Bits7)<<8) | *p++;
up->ysz = g;
}
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(up->iscompr && !(opt&1<<3)){
p += 8; // bitmapComprHdr
size -= 8;
}
if(p+size > ep)
sysfatal("cacheimage2: size: %s", Eshort);
up->type = Uicache;
up->cid = cid;
up->coff = coff;
up->nbytes = size;
up->bytes = p;
return size;
}
/* 2.2.2.2.1.2.4 Cache Color Table (CACHE_COLOR_TABLE_ORDER) */
static int
getcmapcache(Imgupd* up, uchar* a, uint nb, int xorder, int opt)
{
int cid, n;
DBG fprint(2, "getcmapcache...");
USED(xorder);
USED(opt);
cid = a[6];
n = igets(a+7);
if(n != 256)
sysfatal("cachecmap: %d != 256", n);
if(9+4*256 > nb)
sysfatal(Eshort);
up->type = Umcache;
up->cid = cid;
up->bytes = a+9;
up->nbytes = 4*256;
return 9+4*256;
}