ref: 6bb619c8db2867ddd9cd19c0aec05065f5ee0cae
dir: /libmemdraw/draw.c/
#include "lib9.h"
#include "draw.h"
#include "memdraw.h"
#include "pool.h"
extern Pool* imagmem;
int drawdebug;
static int tablesbuilt;
/* perfect approximation to NTSC = .299r+.587g+.114b when 0 ≤ r,g,b < 256 */
#define RGB2K(r,g,b) ((156763*(r)+307758*(g)+59769*(b))>>19)
/*
* for 0 ≤ x ≤ 255*255, (x*0x0101+0x100)>>16 is a perfect approximation.
* for 0 ≤ x < (1<<16), x/255 = ((x+1)*0x0101)>>16 is a perfect approximation.
* the last one is perfect for all up to 1<<16, avoids a multiply, but requires a rathole.
*/
/* #define DIV255(x) (((x)*257+256)>>16) */
#define DIV255(x) ((((x)+1)*257)>>16)
/* #define DIV255(x) (tmp=(x)+1, (tmp+(tmp>>8))>>8) */
#define MUL(x, y, t) (t = (x)*(y)+128, (t+(t>>8))>>8)
#define MASK13 0xFF00FF00
#define MASK02 0x00FF00FF
#define MUL13(a, x, t) (t = (a)*(((x)&MASK13)>>8)+0x800080, ((t+((t>>8)&MASK02))>>8)&MASK02)
#define MUL02(a, x, t) (t = (a)*(((x)&MASK02)>>0)+0x800080, ((t+((t>>8)&MASK02))>>8)&MASK02)
#define MUL0123(a, x, s, t) ((MUL13(a, x, s)<<8)|MUL02(a, x, t))
#define MUL2(u, v, x, y) (t = (u)*(v)+(x)*(y)+256, (t+(t>>8))>>8)
#define BWADD(x, y) ((((x)&MASK13)+((y)&MASK13))&MASK13|(((x)&MASK02)+((y)&MASK02))&MASK02)
static void mktables(void);
typedef int Subdraw(Memdrawparam*);
static Subdraw chardraw, alphadraw, memoptdraw;
static Memimage* memones;
static Memimage* memzeros;
Memimage *memwhite;
Memimage *memblack;
Memimage *memtransparent;
Memimage *memopaque;
int _ifmt(Fmt*);
s32
memimageinit(void)
{
static int didinit = 0;
char *n;
if(didinit)
return 0;
didinit = 1;
n = poolname(imagmem);
if(strcmp(n, "Image") == 0 || strcmp(n, "image") == 0)
poolsetcompact(imagmem, memimagemove);
mktables();
_memmkcmap();
fmtinstall('R', Rfmt);
fmtinstall('P', Pfmt);
fmtinstall('b', _ifmt);
memones = allocmemimage(Rect(0,0,1,1), GREY1);
memones->flags |= Frepl;
memones->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);
*byteaddr(memones, ZP) = ~0;
memzeros = allocmemimage(Rect(0,0,1,1), GREY1);
memzeros->flags |= Frepl;
memzeros->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);
*byteaddr(memzeros, ZP) = 0;
if(memones == nil || memzeros == nil){
assert(0 /*cannot initialize memimage library */); /* RSC BUG */
return -1;
}
memwhite = memones;
memblack = memzeros;
memopaque = memones;
memtransparent = memzeros;
return 0;
}
static u32 imgtorgba(Memimage*, u32);
static u32 rgbatoimg(Memimage*, u32);
static u32 pixelbits(Memimage*, Point);
#define DBG if(drawdebug)
void
memimagedraw(Memimage *dst, Rectangle r, Memimage *src, Point p0, Memimage *mask, Point p1, int op)
{
Memdrawparam par;
if(mask == nil)
mask = memopaque;
DBG print("memimagedraw %p/%uX %R @ %p %p/%uX %P %p/%uX %P... ",
dst, dst->chan, r, dst->data->bdata, src, src->chan, p0, mask, mask->chan, p1);
if(drawclip(dst, &r, src, &p0, mask, &p1, &par.sr, &par.mr) == 0){
if(drawdebug)
iprint("empty clipped rectangle\n");
return;
}
if(op < Clear || op > SoverD){
if(drawdebug)
iprint("op out of range: %d\n", op);
return;
}
par.op = op;
par.dst = dst;
par.r = r;
par.src = src;
/* par.sr set by drawclip */
par.mask = mask;
/* par.mr set by drawclip */
par.state = 0;
if(src->flags&Frepl){
par.state |= Replsrc;
if(Dx(src->r)==1 && Dy(src->r)==1){
par.sval = pixelbits(src, src->r.min);
par.state |= Simplesrc;
par.srgba = imgtorgba(src, par.sval);
par.sdval = rgbatoimg(dst, par.srgba);
if((par.srgba&0xFF) == 0 && (op&DoutS)){
if (drawdebug) iprint("fill with transparent source\n");
return; /* no-op successfully handled */
}
}
}
if(mask->flags & Frepl){
par.state |= Replmask;
if(Dx(mask->r)==1 && Dy(mask->r)==1){
par.mval = pixelbits(mask, mask->r.min);
if(par.mval == 0 && (op&DoutS)){
if(drawdebug) iprint("fill with zero mask\n");
return; /* no-op successfully handled */
}
par.state |= Simplemask;
if(par.mval == ~0)
par.state |= Fullmask;
par.mrgba = imgtorgba(mask, par.mval);
}
}
if(drawdebug)
iprint("dr %R sr %R mr %R...", r, par.sr, par.mr);
DBG print("draw dr %R sr %R mr %R %ux\n", r, par.sr, par.mr, par.state);
/*
* Now that we've clipped the parameters down to be consistent, we
* simply try sub-drawing routines in order until we find one that was able
* to handle us. If the sub-drawing routine returns zero, it means it was
* unable to satisfy the request, so we do not return.
*/
/*
* Hardware support. Each video driver provides this function,
* which checks to see if there is anything it can help with.
* There could be an if around this checking to see if dst is in video memory.
*/
DBG print("test hwdraw\n");
if(hwdraw(&par)){
if(drawdebug) iprint("hw handled\n");
DBG print("hwdraw handled\n");
return;
}
/*
* Optimizations using memmove and memset.
*/
DBG print("test memoptdraw\n");
if(memoptdraw(&par)){
if(drawdebug) iprint("memopt handled\n");
DBG print("memopt handled\n");
return;
}
/*
* Character drawing.
* Solid source color being painted through a boolean mask onto a high res image.
*/
DBG print("test chardraw\n");
if(chardraw(&par)){
if(drawdebug) iprint("chardraw handled\n");
DBG print("chardraw handled\n");
return;
}
/*
* General calculation-laden case that does alpha for each pixel.
*/
DBG print("do alphadraw\n");
alphadraw(&par);
if(drawdebug) iprint("alphadraw handled\n");
DBG print("alphadraw handled\n");
}
/*
* Clip the destination rectangle further based on the properties of the
* source and mask rectangles. Once the destination rectangle is properly
* clipped, adjust the source and mask rectangles to be the same size.
* Then if source or mask is replicated, move its clipped rectangle
* so that its minimum point falls within the repl rectangle.
*
* Return zero if the final rectangle is null.
*/
int
drawclip(Memimage *dst, Rectangle *r, Memimage *src, Point *p0, Memimage *mask, Point *p1, Rectangle *sr, Rectangle *mr)
{
Point rmin, delta;
int splitcoords;
Rectangle omr;
if(r->min.x>=r->max.x || r->min.y>=r->max.y)
return 0;
splitcoords = (p0->x!=p1->x) || (p0->y!=p1->y);
/* clip to destination */
rmin = r->min;
if(!rectclip(r, dst->r) || !rectclip(r, dst->clipr)){
DBG print("drawclip: !rectclip(r, dst->r) || !rectclip(r, dst->clipr)\n");
return 0;
}
/* move mask point */
p1->x += r->min.x-rmin.x;
p1->y += r->min.y-rmin.y;
/* move source point */
p0->x += r->min.x-rmin.x;
p0->y += r->min.y-rmin.y;
/* map destination rectangle into source */
sr->min = *p0;
sr->max.x = p0->x+Dx(*r);
sr->max.y = p0->y+Dy(*r);
/* sr is r in source coordinates; clip to source */
if(!(src->flags&Frepl) && !rectclip(sr, src->r)){
DBG print("drawclip: !(src->flags&Frepl) && !rectclip(sr, src->r)\n");
return 0;
}
if(!rectclip(sr, src->clipr)){
DBG print("drawclip: sr %R src->clipr %R\n\t!rectclip(sr, src->clipr)\n",
*sr, src->clipr);
return 0;
}
/* compute and clip rectangle in mask */
if(splitcoords){
/* move mask point with source */
p1->x += sr->min.x-p0->x;
p1->y += sr->min.y-p0->y;
mr->min = *p1;
mr->max.x = p1->x+Dx(*sr);
mr->max.y = p1->y+Dy(*sr);
omr = *mr;
/* mr is now rectangle in mask; clip it */
if(!(mask->flags&Frepl) && !rectclip(mr, mask->r)){
DBG print("drawclip: !(mask->flags&Frepl) && !rectclip(mr, mask->r)\n");
return 0;
}
if(!rectclip(mr, mask->clipr)){
DBG print("drawclip: !rectclip(mr, mask->clipr)\n");
return 0;
}
/* reflect any clips back to source */
sr->min.x += mr->min.x-omr.min.x;
sr->min.y += mr->min.y-omr.min.y;
sr->max.x += mr->max.x-omr.max.x;
sr->max.y += mr->max.y-omr.max.y;
*p1 = mr->min;
}else{
if(!(mask->flags&Frepl) && !rectclip(sr, mask->r)){
DBG print("drawclip: !(mask->flags&Frepl) && !rectclip(mr, mask->r)\n");
return 0;
}
if(!rectclip(sr, mask->clipr)){
DBG print("drawclip: !rectclip(mr, mask->clipr)\n");
return 0;
}
*p1 = sr->min;
}
/* move source clipping back to destination */
delta.x = r->min.x - p0->x;
delta.y = r->min.y - p0->y;
r->min.x = sr->min.x + delta.x;
r->min.y = sr->min.y + delta.y;
r->max.x = sr->max.x + delta.x;
r->max.y = sr->max.y + delta.y;
/* move source rectangle so sr->min is in src->r */
if(src->flags&Frepl) {
delta.x = drawreplxy(src->r.min.x, src->r.max.x, sr->min.x) - sr->min.x;
delta.y = drawreplxy(src->r.min.y, src->r.max.y, sr->min.y) - sr->min.y;
sr->min.x += delta.x;
sr->min.y += delta.y;
sr->max.x += delta.x;
sr->max.y += delta.y;
}
*p0 = sr->min;
/* move mask point so it is in mask->r */
*p1 = drawrepl(mask->r, *p1);
mr->min = *p1;
mr->max.x = p1->x+Dx(*sr);
mr->max.y = p1->y+Dy(*sr);
assert(Dx(*sr) == Dx(*mr) && Dx(*mr) == Dx(*r));
assert(Dy(*sr) == Dy(*mr) && Dy(*mr) == Dy(*r));
assert(ptinrect(*p0, src->r));
assert(ptinrect(*p1, mask->r));
assert(ptinrect(r->min, dst->r));
return 1;
}
#undef DBG
/*
* Conversion tables.
*/
static uchar replbit[1+8][256]; /* replbit[x][y] is the replication of the x-bit quantity y to 8-bit depth */
/*
* bitmap of how to replicate n bits to fill 8, for 1 ≤ n ≤ 8.
* the X's are where to put the bottom (ones) bit of the n-bit pattern.
* only the top 8 bits of the result are actually used.
* (the lower 8 bits are needed to get bits in the right place
* when n is not a divisor of 8.)
*
* Should check to see if its easier to just refer to replmul than
* use the precomputed values in replbit. On PCs it may well
* be; on machines with slow multiply instructions it probably isn't.
*/
#define a ((((((((((((((((0
#define X *2+1)
#define _ *2)
static int replmul[1+8] = {
0,
a X X X X X X X X X X X X X X X X,
a _ X _ X _ X _ X _ X _ X _ X _ X,
a _ _ X _ _ X _ _ X _ _ X _ _ X _,
a _ _ _ X _ _ _ X _ _ _ X _ _ _ X,
a _ _ _ _ X _ _ _ _ X _ _ _ _ X _,
a _ _ _ _ _ X _ _ _ _ _ X _ _ _ _,
a _ _ _ _ _ _ X _ _ _ _ _ _ X _ _,
a _ _ _ _ _ _ _ X _ _ _ _ _ _ _ X,
};
#undef a
#undef X
#undef _
static void
mktables(void)
{
int i, j, small;
if(tablesbuilt)
return;
fmtinstall('R', Rfmt);
fmtinstall('P', Pfmt);
tablesbuilt = 1;
/* bit replication up to 8 bits */
for(i=0; i<256; i++){
for(j=0; j<=8; j++){ /* j <= 8 [sic] */
small = i & ((1<<j)-1);
replbit[j][i] = (small*replmul[j])>>8;
}
}
}
static uchar ones = 0xff;
/*
* General alpha drawing case. Can handle anything.
*/
typedef struct Buffer Buffer;
struct Buffer {
/* used by most routines */
uchar *red;
uchar *grn;
uchar *blu;
uchar *alpha;
uchar *grey;
u32 *rgba;
int delta; /* number of bytes to add to pointer to get next pixel to the right */
/* used by boolcalc* for mask data */
uchar *m; /* ptr to mask data r.min byte; like p->bytermin */
int mskip; /* no. of left bits to skip in *m */
uchar *bm; /* ptr to mask data img->r.min byte; like p->bytey0s */
int bmskip; /* no. of left bits to skip in *bm */
uchar *em; /* ptr to mask data img->r.max.x byte; like p->bytey0e */
int emskip; /* no. of right bits to skip in *em */
};
typedef struct Param Param;
typedef Buffer Readfn(Param*, uchar*, int);
typedef void Writefn(Param*, uchar*, Buffer);
typedef Buffer Calcfn(Buffer, Buffer, Buffer, int, int, int);
enum {
MAXBCACHE = 16
};
/* giant rathole to customize functions with */
struct Param {
Readfn *replcall;
Readfn *greymaskcall;
Readfn *convreadcall;
Writefn *convwritecall;
Memimage *img;
Rectangle r;
int dx; /* of r */
int needbuf;
int convgrey;
int alphaonly;
uchar *bytey0s; /* byteaddr(Pt(img->r.min.x, img->r.min.y)) */
uchar *bytermin; /* byteaddr(Pt(r.min.x, img->r.min.y)) */
uchar *bytey0e; /* byteaddr(Pt(img->r.max.x, img->r.min.y)) */
int bwidth;
int replcache; /* if set, cache buffers */
Buffer bcache[MAXBCACHE];
u32 bfilled;
uchar *bufbase;
int bufoff;
int bufdelta;
int dir;
int convbufoff;
uchar *convbuf;
Param *convdpar;
int convdx;
};
static Readfn greymaskread, replread, readptr;
static Writefn nullwrite;
static Calcfn alphacalc0, alphacalc14, alphacalc2810, alphacalc3679, alphacalc5, alphacalc11, alphacalcS;
static Calcfn boolcalc14, boolcalc236789, boolcalc1011;
static Readfn* readfn(Memimage*);
static Readfn* readalphafn(Memimage*);
static Writefn* writefn(Memimage*);
static Calcfn* boolcopyfn(Memimage*, Memimage*);
static Readfn* convfn(Memimage*, Param*, Memimage*, Param*, int*);
static Readfn* ptrfn(Memimage*);
static Calcfn *alphacalc[Ncomp] =
{
alphacalc0, /* Clear */
alphacalc14, /* DoutS */
alphacalc2810, /* SoutD */
alphacalc3679, /* DxorS */
alphacalc14, /* DinS */
alphacalc5, /* D */
alphacalc3679, /* DatopS */
alphacalc3679, /* DoverS */
alphacalc2810, /* SinD */
alphacalc3679, /* SatopD */
alphacalc2810, /* S */
alphacalc11, /* SoverD */
};
static Calcfn *boolcalc[Ncomp] =
{
alphacalc0, /* Clear */
boolcalc14, /* DoutS */
boolcalc236789, /* SoutD */
boolcalc236789, /* DxorS */
boolcalc14, /* DinS */
alphacalc5, /* D */
boolcalc236789, /* DatopS */
boolcalc236789, /* DoverS */
boolcalc236789, /* SinD */
boolcalc236789, /* SatopD */
boolcalc1011, /* S */
boolcalc1011, /* SoverD */
};
/*
* Avoid standard Lock, QLock so that can be used in kernel.
*/
typedef struct Dbuf Dbuf;
struct Dbuf
{
uchar *p;
int n;
Param spar, mpar, dpar;
int inuse;
};
static Dbuf dbuf[10];
static Dbuf*
allocdbuf(void)
{
int i;
for(i=0; i<nelem(dbuf); i++){
if(dbuf[i].inuse)
continue;
if(!_tas(&dbuf[i].inuse))
return &dbuf[i];
}
return nil;
}
static void
getparam(Param *p, Memimage *img, Rectangle r, int convgrey, int needbuf, int *ndrawbuf)
{
int nbuf;
memset(p, 0, sizeof *p);
p->img = img;
p->r = r;
p->dx = Dx(r);
p->needbuf = needbuf;
p->convgrey = convgrey;
assert(img->r.min.x <= r.min.x && r.min.x < img->r.max.x);
p->bytey0s = byteaddr(img, Pt(img->r.min.x, img->r.min.y));
p->bytermin = byteaddr(img, Pt(r.min.x, img->r.min.y));
p->bytey0e = byteaddr(img, Pt(img->r.max.x, img->r.min.y));
p->bwidth = sizeof(u32)*img->width;
assert(p->bytey0s <= p->bytermin && p->bytermin <= p->bytey0e);
if(p->r.min.x == p->img->r.min.x)
assert(p->bytermin == p->bytey0s);
nbuf = 1;
if((img->flags&Frepl) && Dy(img->r) <= MAXBCACHE && Dy(img->r) < Dy(r)){
p->replcache = 1;
nbuf = Dy(img->r);
}
p->bufdelta = 4*p->dx;
p->bufoff = *ndrawbuf;
*ndrawbuf += p->bufdelta*nbuf;
}
static void
clipy(Memimage *img, int *y)
{
int dy;
dy = Dy(img->r);
if(*y == dy)
*y = 0;
else if(*y == -1)
*y = dy-1;
assert(0 <= *y && *y < dy);
}
static void
dumpbuf(char *s, Buffer b, int n)
{
int i;
uchar *p;
print("%s", s);
for(i=0; i<n; i++){
print(" ");
if(p=b.grey){
print(" k%.2uX", *p);
b.grey += b.delta;
}else{
if(p=b.red){
print(" r%.2uX", *p);
b.red += b.delta;
}
if(p=b.grn){
print(" g%.2uX", *p);
b.grn += b.delta;
}
if(p=b.blu){
print(" b%.2uX", *p);
b.blu += b.delta;
}
}
if((p=b.alpha) != &ones){
print(" α%.2uX", *p);
b.alpha += b.delta;
}
}
print("\n");
}
/*
* For each scan line, we expand the pixels from source, mask, and destination
* into byte-aligned red, green, blue, alpha, and grey channels. If buffering is not
* needed and the channels were already byte-aligned (grey8, rgb24, rgba32, rgb32),
* the readers need not copy the data: they can simply return pointers to the data.
* If the destination image is grey and the source is not, it is converted using the NTSC
* formula.
*
* Once we have all the channels, we call either rgbcalc or greycalc, depending on
* whether the destination image is color. This is allowed to overwrite the dst buffer (perhaps
* the actual data, perhaps a copy) with its result. It should only overwrite the dst buffer
* with the same format (i.e. red bytes with red bytes, etc.) A new buffer is returned from
* the calculator, and that buffer is passed to a function to write it to the destination.
* If the buffer is already pointing at the destination, the writing function is a no-op.
*/
#define DBG if(0)
static int
alphadraw(Memdrawparam *par)
{
int isgrey, starty, endy, op;
int needbuf, dsty, srcy, masky;
int y, dir, dx, dy, ndrawbuf;
uchar *drawbuf;
Buffer bsrc, bdst, bmask;
Readfn *rdsrc, *rdmask, *rddst;
Calcfn *calc;
Writefn *wrdst;
Memimage *src, *mask, *dst;
Rectangle r, sr, mr;
Dbuf *z;
z = allocdbuf();
if(z == nil)
return 0;
r = par->r;
dx = Dx(r);
dy = Dy(r);
src = par->src;
mask = par->mask;
dst = par->dst;
sr = par->sr;
mr = par->mr;
op = par->op;
isgrey = dst->flags&Fgrey;
/*
* Buffering when src and dst are the same bitmap is sufficient but not
* necessary. There are stronger conditions we could use. We could
* check to see if the rectangles intersect, and if simply moving in the
* correct y direction can avoid the need to buffer.
*/
needbuf = (src->data == dst->data);
ndrawbuf = 0;
getparam(&z->spar, src, sr, isgrey, needbuf, &ndrawbuf);
getparam(&z->dpar, dst, r, isgrey, needbuf, &ndrawbuf);
getparam(&z->mpar, mask, mr, 0, needbuf, &ndrawbuf);
dir = (needbuf && byteaddr(dst, r.min) > byteaddr(src, sr.min)) ? -1 : 1;
z->spar.dir = z->mpar.dir = z->dpar.dir = dir;
/*
* If the mask is purely boolean, we can convert from src to dst format
* when we read src, and then just copy it to dst where the mask tells us to.
* This requires a boolean (1-bit grey) mask and lack of a source alpha channel.
*
* The computation is accomplished by assigning the function pointers as follows:
* rdsrc - read and convert source into dst format in a buffer
* rdmask - convert mask to bytes, set pointer to it
* rddst - fill with pointer to real dst data, but do no reads
* calc - copy src onto dst when mask says to.
* wrdst - do nothing
* This is slightly sleazy, since things aren't doing exactly what their names say,
* but it avoids a fair amount of code duplication to make this a case here
* rather than have a separate booldraw.
*/
if(drawdebug) iprint("flag %ud mchan %ux=?%x dd %d\n", src->flags&Falpha, mask->chan, GREY1, dst->depth);
if(!(src->flags&Falpha) && mask->chan == GREY1 && dst->depth >= 8 && op == SoverD){
if(drawdebug) iprint("boolcopy...");
rdsrc = convfn(dst, &z->dpar, src, &z->spar, &ndrawbuf);
rddst = readptr;
rdmask = readfn(mask);
calc = boolcopyfn(dst, mask);
wrdst = nullwrite;
}else{
/* usual alphadraw parameter fetching */
rdsrc = readfn(src);
rddst = readfn(dst);
wrdst = writefn(dst);
if(drawdebug) iprint("alphacalc op %d\n", op);
calc = alphacalc[op];
/*
* If there is no alpha channel, we'll ask for a grey channel
* and pretend it is the alpha.
*/
if(mask->flags&Falpha){
rdmask = readalphafn(mask);
z->mpar.alphaonly = 1;
}else{
z->mpar.greymaskcall = readfn(mask);
z->mpar.convgrey = 1;
rdmask = greymaskread;
/*
* Should really be above, but then boolcopyfns would have
* to deal with bit alignment, and I haven't written that.
*
* This is a common case for things like ellipse drawing.
* When there's no alpha involved and the mask is boolean,
* we can avoid all the division and multiplication.
*/
if(mask->chan == GREY1 && !(src->flags&Falpha)){
if(drawdebug) iprint("boolcalc op %d\n", op);
calc = boolcalc[op];
}else if(op == SoverD && !(src->flags&Falpha)){
if(drawdebug) iprint("alphacalcS\n");
calc = alphacalcS;
}
}
}
if(drawdebug) iprint("after if\n");
/*
* If the image has a small enough repl rectangle,
* we can just read each line once and cache them.
*/
if(z->spar.replcache){
z->spar.replcall = rdsrc;
rdsrc = replread;
}
if(z->mpar.replcache){
z->mpar.replcall = rdmask;
rdmask = replread;
}
if(z->n < ndrawbuf){
free(z->p);
if((z->p = mallocz(ndrawbuf, 0)) == nil){
z->inuse = 0;
return 0;
}
z->n = ndrawbuf;
}
drawbuf = z->p;
if(drawdebug) iprint("after drawbuf\n");
/*
* Before we were saving only offsets from drawbuf in the parameter
* structures; now that drawbuf has been grown to accomodate us,
* we can fill in the pointers.
*/
z->spar.bufbase = drawbuf+z->spar.bufoff;
z->mpar.bufbase = drawbuf+z->mpar.bufoff;
z->dpar.bufbase = drawbuf+z->dpar.bufoff;
z->spar.convbuf = drawbuf+z->spar.convbufoff;
if(dir == 1){
starty = 0;
endy = dy;
}else{
starty = dy-1;
endy = -1;
}
if(drawdebug) iprint("before srcy\n");
/*
* srcy, masky, and dsty are offsets from the top of their
* respective Rectangles. they need to be contained within
* the rectangles, so clipy can keep them there without division.
*/
srcy = (starty + sr.min.y - src->r.min.y)%Dy(src->r);
masky = (starty + mr.min.y - mask->r.min.y)%Dy(mask->r);
dsty = starty + r.min.y - dst->r.min.y;
assert(0 <= srcy && srcy < Dy(src->r));
assert(0 <= masky && masky < Dy(mask->r));
assert(0 <= dsty && dsty < Dy(dst->r));
if(drawdebug) iprint("before for y=starty\n");
for(y=starty; y!=endy; y+=dir, srcy+=dir, masky+=dir, dsty+=dir){
if(drawdebug) iprint("\ty=%d ", y);
clipy(src, &srcy);
clipy(dst, &dsty);
clipy(mask, &masky);
bsrc = rdsrc(&z->spar, z->spar.bufbase, srcy);
DBG print("[");
bmask = rdmask(&z->mpar, z->mpar.bufbase, masky);
DBG print("]\n");
bdst = rddst(&z->dpar, z->dpar.bufbase, dsty);
if(op != Clear && (bsrc.delta != 4 || bdst.delta != 4 || src->chan != dst->chan))
bdst.rgba = nil;
DBG dumpbuf("src", bsrc, dx);
DBG dumpbuf("mask", bmask, dx);
DBG dumpbuf("dst", bdst, dx);
/* this is where the trapBUS error is springing from */
bdst = calc(bdst, bsrc, bmask, dx, isgrey, op);
wrdst(&z->dpar, z->dpar.bytermin+dsty*z->dpar.bwidth, bdst);
}
z->inuse = 0;
if(drawdebug) iprint("alphadraw return 1\n");
return 1;
}
#undef DBG
static Buffer
alphacalc0(Buffer bdst, Buffer b1, Buffer b2, int dx, int grey, int op)
{
USED(b1.grey);
USED(b2.grey);
USED(grey);
USED(op);
memset(bdst.rgba, 0, dx*bdst.delta);
return bdst;
}
static Buffer
alphacalc14(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fd, sadelta;
int i, sa, ma;
u32 s, t;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
for(i=0; i<dx; i++){
sa = *bsrc.alpha;
ma = *bmask.alpha;
fd = MUL(sa, ma, t);
if(op == DoutS)
fd = 255-fd;
if(grey){
*bdst.grey = MUL(fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(bdst.rgba){
*bdst.rgba = MUL0123(fd, *bdst.rgba, s, t);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
bmask.alpha += bmask.delta;
continue;
}
*bdst.red = MUL(fd, *bdst.red, t);
*bdst.grn = MUL(fd, *bdst.grn, t);
*bdst.blu = MUL(fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
*bdst.alpha = MUL(fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
bsrc.alpha += sadelta;
}
return obdst;
}
static Buffer
alphacalc2810(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fs, sadelta;
int i, ma, da;
u32 s, t;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
for(i=0; i<dx; i++){
ma = *bmask.alpha;
da = *bdst.alpha;
if(op == SoutD)
da = 255-da;
fs = ma;
if(op != S)
fs = MUL(fs, da, t);
if(grey){
*bdst.grey = MUL(fs, *bsrc.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(bdst.rgba){
*bdst.rgba = MUL0123(fs, *bsrc.rgba, s, t);
bsrc.rgba++;
bdst.rgba++;
bmask.alpha += bmask.delta;
bdst.alpha += bdst.delta;
continue;
}
*bdst.red = MUL(fs, *bsrc.red, t);
*bdst.grn = MUL(fs, *bsrc.grn, t);
*bdst.blu = MUL(fs, *bsrc.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
*bdst.alpha = MUL(fs, *bsrc.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
bsrc.alpha += sadelta;
}
return obdst;
}
static Buffer
alphacalc3679(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fs, fd, sadelta;
int i, sa, ma, da;
u32 s, t, q1, q2;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
for(i=0; i<dx; i++){
sa = *bsrc.alpha;
ma = *bmask.alpha;
da = *bdst.alpha;
if(op == SatopD)
fs = MUL(ma, da, t);
else
fs = MUL(ma, 255-da, t);
if(op == DoverS)
fd = 255;
else{
fd = MUL(sa, ma, t);
if(op != DatopS)
fd = 255-fd;
}
if(grey){
*bdst.grey = MUL(fs, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(bdst.rgba){
q1 = MUL0123(fs, *bsrc.rgba, s, t);
q2 = MUL0123(fd, *bdst.rgba, s, t);
*bdst.rgba = BWADD(q1, q2);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
bmask.alpha += bmask.delta;
bdst.alpha += bdst.delta;
continue;
}
*bdst.red = MUL(fs, *bsrc.red, s)+MUL(fd, *bdst.red, t);
*bdst.grn = MUL(fs, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
*bdst.blu = MUL(fs, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
*bdst.alpha = MUL(fs, sa, s)+MUL(fd, da, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
bsrc.alpha += sadelta;
}
return obdst;
}
static Buffer
alphacalc5(Buffer bdst, Buffer b1, Buffer b2, int dx, int grey, int op)
{
USED(b1.grey);
USED(b2.grey);
USED(dx);
USED(grey);
USED(op);
return bdst;
}
static Buffer
alphacalc11(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fd, sadelta;
int i, sa, ma;
u32 s, t, q1, q2;
USED(op);
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
for(i=0; i<dx; i++){
sa = *bsrc.alpha;
ma = *bmask.alpha;
fd = 255-MUL(sa, ma, t);
if(grey){
*bdst.grey = MUL(ma, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(bdst.rgba){
q1 = MUL0123(ma, *bsrc.rgba, s, t);
q2 = MUL0123(fd, *bdst.rgba, s, t);
*bdst.rgba = BWADD(q1, q2);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
bmask.alpha += bmask.delta;
continue;
}
*bdst.red = MUL(ma, *bsrc.red, s)+MUL(fd, *bdst.red, t);
*bdst.grn = MUL(ma, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
*bdst.blu = MUL(ma, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
*bdst.alpha = MUL(ma, sa, s)+MUL(fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
bsrc.alpha += sadelta;
}
return obdst;
}
/*
not used yet
source and mask alpha 1
static Buffer
alphacalcS0(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int i;
USED(op);
obdst = bdst;
if(bsrc.delta == bdst.delta){
memmove(bdst.rgba, bsrc.rgba, dx*bdst.delta);
return obdst;
}
for(i=0; i<dx; i++){
if(grey){
*bdst.grey = *bsrc.grey;
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
*bdst.red = *bsrc.red;
*bdst.grn = *bsrc.grn;
*bdst.blu = *bsrc.blu;
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
*bdst.alpha = 255;
bdst.alpha += bdst.delta;
}
}
return obdst;
}
*/
/* source alpha 1 */
static Buffer
alphacalcS(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fd;
int i, ma;
u32 s, t;
// iprint("\t\talphacalcS");
USED(op);
obdst = bdst;
// iprint(" grey %d dx %d ", grey, dx);
for(i=0; i<dx; i++){
//if(i > dx-2)
// iprint(" i %d ", i);
ma = *bmask.alpha;
fd = 255-ma;
if(grey){
*bdst.grey = MUL(ma, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
/* if(i > dx-2){
iprint("ma %d *bsrc.red %d s %d fd %d *bdst.red %d t %d ",
ma, *bsrc.red, s, fd, *bdst.red, t);
} */
*bdst.red = MUL(ma, *bsrc.red, s)+MUL(fd, *bdst.red, t);
*bdst.grn = MUL(ma, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
*bdst.blu = MUL(ma, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
/* if(i > dx-2){
iprint("*%p %x ", bdst.red, *bdst.red);
} */
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){
// iprint("alphacalcS != &ones\n");
*bdst.alpha = ma+MUL(fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
}
// iprint("\n");
return obdst;
}
static Buffer
boolcalc14(Buffer bdst, Buffer b1, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int i, ma, zero;
USED(b1.grey);
obdst = bdst;
for(i=0; i<dx; i++){
ma = *bmask.alpha;
zero = ma ? op == DoutS : op == DinS;
if(grey){
if(zero)
*bdst.grey = 0;
bdst.grey += bdst.delta;
}else{
if(zero)
*bdst.red = *bdst.grn = *bdst.blu = 0;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
bmask.alpha += bmask.delta;
if(bdst.alpha != &ones){
if(zero)
*bdst.alpha = 0;
bdst.alpha += bdst.delta;
}
}
return obdst;
}
static Buffer
boolcalc236789(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int fs, fd;
int i, ma, da, zero;
u32 s, t;
obdst = bdst;
zero = !(op&1);
for(i=0; i<dx; i++){
ma = *bmask.alpha;
da = *bdst.alpha;
fs = da;
if(op&2)
fs = 255-da;
fd = 0;
if(op&4)
fd = 255;
if(grey){
if(ma)
*bdst.grey = MUL(fs, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
else if(zero)
*bdst.grey = 0;
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(ma){
*bdst.red = MUL(fs, *bsrc.red, s)+MUL(fd, *bdst.red, t);
*bdst.grn = MUL(fs, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
*bdst.blu = MUL(fs, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
}
else if(zero)
*bdst.red = *bdst.grn = *bdst.blu = 0;
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
bmask.alpha += bmask.delta;
if(bdst.alpha != &ones){
if(ma)
*bdst.alpha = fs+MUL(fd, da, t);
else if(zero)
*bdst.alpha = 0;
bdst.alpha += bdst.delta;
}
}
return obdst;
}
static Buffer
boolcalc1011(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{
Buffer obdst;
int i, ma, zero;
obdst = bdst;
zero = !(op&1);
for(i=0; i<dx; i++){
ma = *bmask.alpha;
if(grey){
if(ma)
*bdst.grey = *bsrc.grey;
else if(zero)
*bdst.grey = 0;
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{
if(ma){
*bdst.red = *bsrc.red;
*bdst.grn = *bsrc.grn;
*bdst.blu = *bsrc.blu;
}
else if(zero)
*bdst.red = *bdst.grn = *bdst.blu = 0;
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
bdst.red += bdst.delta;
bdst.blu += bdst.delta;
bdst.grn += bdst.delta;
}
bmask.alpha += bmask.delta;
if(bdst.alpha != &ones){
if(ma)
*bdst.alpha = 255;
else if(zero)
*bdst.alpha = 0;
bdst.alpha += bdst.delta;
}
}
return obdst;
}
/*
* Replicated cached scan line read. Call the function listed in the Param,
* but cache the result so that for replicated images we only do the work once.
*/
static Buffer
replread(Param *p, uchar *s, int y)
{
Buffer *b;
USED(s);
b = &p->bcache[y];
if((p->bfilled & (1<<y)) == 0){
p->bfilled |= 1<<y;
*b = p->replcall(p, p->bufbase+y*p->bufdelta, y);
}
return *b;
}
/*
* Alpha reading function that simply relabels the grey pointer.
*/
static Buffer
greymaskread(Param *p, uchar *buf, int y)
{
Buffer b;
b = p->greymaskcall(p, buf, y);
b.alpha = b.grey;
return b;
}
#define DBG if(0)
static Buffer
readnbit(Param *p, uchar *buf, int y)
{
Buffer b;
Memimage *img;
uchar *repl, *r, *w, *ow, bits;
int i, n, sh, depth, x, dx, npack, nbits;
b.rgba = (u32*)buf;
b.grey = w = buf;
b.red = b.blu = b.grn = w;
b.alpha = &ones;
b.delta = 1;
dx = p->dx;
img = p->img;
depth = img->depth;
repl = &replbit[depth][0];
npack = 8/depth;
sh = 8-depth;
/* copy from p->r.min.x until end of repl rectangle */
x = p->r.min.x;
n = dx;
if(n > p->img->r.max.x - x)
n = p->img->r.max.x - x;
r = p->bytermin + y*p->bwidth;
DBG print("readnbit dx %d %p=%p+%d*%d, *r=%d fetch %d ", dx, r, p->bytermin, y, p->bwidth, *r, n);
bits = *r++;
nbits = 8;
if(i=x&(npack-1)){
DBG print("throwaway %d...", i);
bits <<= depth*i;
nbits -= depth*i;
}
for(i=0; i<n; i++){
if(nbits == 0){
DBG print("(%.2ux)...", *r);
bits = *r++;
nbits = 8;
}
*w++ = repl[bits>>sh];
DBG print("bit %x...", repl[bits>>sh]);
bits <<= depth;
nbits -= depth;
}
dx -= n;
if(dx == 0)
return b;
assert(x+i == p->img->r.max.x);
/* copy from beginning of repl rectangle until where we were before. */
x = p->img->r.min.x;
n = dx;
if(n > p->r.min.x - x)
n = p->r.min.x - x;
r = p->bytey0s + y*p->bwidth;
DBG print("x=%d r=%p...", x, r);
bits = *r++;
nbits = 8;
if(i=x&(npack-1)){
bits <<= depth*i;
nbits -= depth*i;
}
DBG print("nbits=%d...", nbits);
for(i=0; i<n; i++){
if(nbits == 0){
bits = *r++;
nbits = 8;
}
*w++ = repl[bits>>sh];
DBG print("bit %x...", repl[bits>>sh]);
bits <<= depth;
nbits -= depth;
DBG print("bits %x nbits %d...", bits, nbits);
}
dx -= n;
if(dx == 0)
return b;
assert(dx > 0);
/* now we have exactly one full scan line: just replicate the buffer itself until we are done */
ow = buf;
while(dx--)
*w++ = *ow++;
return b;
}
#undef DBG
#define DBG if(0)
static void
writenbit(Param *p, uchar *w, Buffer src)
{
uchar *r;
u32 bits;
int i, sh, depth, npack, nbits, x, ex;
assert(src.grey != nil && src.delta == 1);
x = p->r.min.x;
ex = x+p->dx;
depth = p->img->depth;
npack = 8/depth;
i=x&(npack-1);
bits = i ? (*w >> (8-depth*i)) : 0;
nbits = depth*i;
sh = 8-depth;
r = src.grey;
for(; x<ex; x++){
bits <<= depth;
DBG print(" %x", *r);
bits |= (*r++ >> sh);
nbits += depth;
if(nbits == 8){
*w++ = bits;
nbits = 0;
}
}
if(nbits){
sh = 8-nbits;
bits <<= sh;
bits |= *w & ((1<<sh)-1);
*w = bits;
}
DBG print("\n");
return;
}
#undef DBG
static Buffer
readcmap(Param *p, uchar *buf, int y)
{
Buffer b;
int a, convgrey, copyalpha, dx, i, m;
uchar *q, *cmap, *begin, *end, *r, *w;
begin = p->bytey0s + y*p->bwidth;
r = p->bytermin + y*p->bwidth;
end = p->bytey0e + y*p->bwidth;
cmap = p->img->cmap->cmap2rgb;
convgrey = p->convgrey;
copyalpha = (p->img->flags&Falpha) ? 1 : 0;
w = buf;
dx = p->dx;
if(copyalpha){
b.alpha = buf++;
a = p->img->shift[CAlpha]/8;
m = p->img->shift[CMap]/8;
for(i=0; i<dx; i++){
*w++ = r[a];
q = cmap+r[m]*3;
r += 2;
if(r == end)
r = begin;
if(convgrey){
*w++ = RGB2K(q[0], q[1], q[2]);
}else{
*w++ = q[2]; /* blue */
*w++ = q[1]; /* green */
*w++ = q[0]; /* red */
}
}
}else{
b.alpha = &ones;
for(i=0; i<dx; i++){
q = cmap+*r++*3;
if(r == end)
r = begin;
if(convgrey){
*w++ = RGB2K(q[0], q[1], q[2]);
}else{
*w++ = q[2]; /* blue */
*w++ = q[1]; /* green */
*w++ = q[0]; /* red */
}
}
}
b.rgba = (u32*)(buf-copyalpha);
if(convgrey){
b.grey = buf;
b.red = b.blu = b.grn = buf;
b.delta = 1+copyalpha;
}else{
b.blu = buf;
b.grn = buf+1;
b.red = buf+2;
b.grey = nil;
b.delta = 3+copyalpha;
}
return b;
}
static void
writecmap(Param *p, uchar *w, Buffer src)
{
uchar *cmap, *red, *grn, *blu;
int i, dx, delta;
cmap = p->img->cmap->rgb2cmap;
delta = src.delta;
red= src.red;
grn = src.grn;
blu = src.blu;
dx = p->dx;
for(i=0; i<dx; i++, red+=delta, grn+=delta, blu+=delta)
*w++ = cmap[(*red>>4)*256+(*grn>>4)*16+(*blu>>4)];
}
#define DBG if(0)
static Buffer
readbyte(Param *p, uchar *buf, int y)
{
Buffer b;
Memimage *img;
int dx, isgrey, convgrey, alphaonly, copyalpha, i, nb;
uchar *begin, *end, *r, *w, *rrepl, *grepl, *brepl, *arepl, *krepl;
uchar ured, ugrn, ublu;
u32 u;
img = p->img;
begin = p->bytey0s + y*p->bwidth;
r = p->bytermin + y*p->bwidth;
end = p->bytey0e + y*p->bwidth;
w = buf;
dx = p->dx;
nb = img->depth/8;
convgrey = p->convgrey; /* convert rgb to grey */
isgrey = img->flags&Fgrey;
alphaonly = p->alphaonly;
copyalpha = (img->flags&Falpha) ? 1 : 0;
DBG print("copyalpha %d alphaonly %d convgrey %d isgrey %d\n", copyalpha, alphaonly, convgrey, isgrey);
/* if we can, avoid processing everything */
if(!(img->flags&Frepl) && !convgrey && (img->flags&Fbytes)){
memset(&b, 0, sizeof b);
if(p->needbuf){
memmove(buf, r, dx*nb);
r = buf;
}
b.rgba = (u32*)r;
if(copyalpha)
b.alpha = r+img->shift[CAlpha]/8;
else
b.alpha = &ones;
if(isgrey){
b.grey = r+img->shift[CGrey]/8;
b.red = b.grn = b.blu = b.grey;
}else{
b.red = r+img->shift[CRed]/8;
b.grn = r+img->shift[CGreen]/8;
b.blu = r+img->shift[CBlue]/8;
}
b.delta = nb;
return b;
}
DBG print("2\n");
rrepl = replbit[img->nbits[CRed]];
grepl = replbit[img->nbits[CGreen]];
brepl = replbit[img->nbits[CBlue]];
arepl = replbit[img->nbits[CAlpha]];
krepl = replbit[img->nbits[CGrey]];
for(i=0; i<dx; i++){
u = r[0] | (r[1]<<8) | (r[2]<<16) | (r[3]<<24);
if(copyalpha) {
*w++ = arepl[(u>>img->shift[CAlpha]) & img->mask[CAlpha]];
DBG print("a %x\n", w[-1]);
}
if(isgrey)
*w++ = krepl[(u >> img->shift[CGrey]) & img->mask[CGrey]];
else if(!alphaonly){
ured = rrepl[(u >> img->shift[CRed]) & img->mask[CRed]];
ugrn = grepl[(u >> img->shift[CGreen]) & img->mask[CGreen]];
ublu = brepl[(u >> img->shift[CBlue]) & img->mask[CBlue]];
if(convgrey){
DBG print("g %x %x %x\n", ured, ugrn, ublu);
*w++ = RGB2K(ured, ugrn, ublu);
DBG print("%x\n", w[-1]);
}else{
*w++ = ublu;
*w++ = ugrn;
*w++ = ured;
}
}
r += nb;
if(r == end)
r = begin;
}
b.alpha = copyalpha ? buf : &ones;
b.rgba = (u32*)buf;
if(alphaonly){
b.red = b.grn = b.blu = b.grey = nil;
if(!copyalpha)
b.rgba = nil;
b.delta = 1;
}else if(isgrey || convgrey){
b.grey = buf+copyalpha;
b.red = b.grn = b.blu = buf+copyalpha;
b.delta = copyalpha+1;
DBG print("alpha %x grey %x\n", b.alpha ? *b.alpha : 0xFF, *b.grey);
}else{
b.blu = buf+copyalpha;
b.grn = buf+copyalpha+1;
b.grey = nil;
b.red = buf+copyalpha+2;
b.delta = copyalpha+3;
}
return b;
}
#undef DBG
#define DBG if(0)
static void
writebyte(Param *p, uchar *w, Buffer src)
{
Memimage *img;
int i, isalpha, isgrey, nb, delta, dx, adelta;
uchar ff, *red, *grn, *blu, *grey, *alpha;
u32 u, mask;
img = p->img;
red = src.red;
grn = src.grn;
blu = src.blu;
alpha = src.alpha;
delta = src.delta;
grey = src.grey;
dx = p->dx;
nb = img->depth/8;
mask = (nb==4) ? 0 : ~((1<<img->depth)-1);
isalpha = img->flags&Falpha;
isgrey = img->flags&Fgrey;
adelta = src.delta;
if(isalpha && (alpha == nil || alpha == &ones)){
ff = 0xFF;
alpha = &ff;
adelta = 0;
}
for(i=0; i<dx; i++){
u = w[0] | (w[1]<<8) | (w[2]<<16) | (w[3]<<24);
DBG print("u %.8ux...", u);
u &= mask;
DBG print("&mask %.8ux...", u);
if(isgrey){
u |= ((*grey >> (8-img->nbits[CGrey])) & img->mask[CGrey]) << img->shift[CGrey];
DBG print("|grey %.8ux...", u);
grey += delta;
}else{
u |= ((*red >> (8-img->nbits[CRed])) & img->mask[CRed]) << img->shift[CRed];
u |= ((*grn >> (8-img->nbits[CGreen])) & img->mask[CGreen]) << img->shift[CGreen];
u |= ((*blu >> (8-img->nbits[CBlue])) & img->mask[CBlue]) << img->shift[CBlue];
red += delta;
grn += delta;
blu += delta;
DBG print("|rgb %.8ux...", u);
}
if(isalpha){
u |= ((*alpha >> (8-img->nbits[CAlpha])) & img->mask[CAlpha]) << img->shift[CAlpha];
alpha += adelta;
DBG print("|alpha %.8ux...", u);
}
w[0] = u;
w[1] = u>>8;
w[2] = u>>16;
w[3] = u>>24;
w += nb;
}
}
#undef DBG
static Readfn*
readfn(Memimage *img)
{
if(img->depth < 8){
return readnbit;
}
if(img->nbits[CMap] == 8){
return readcmap;
}
return readbyte;
}
static Readfn*
readalphafn(Memimage *m)
{
USED(m);
return readbyte;
}
static Writefn*
writefn(Memimage *img)
{
if(img->depth < 8)
return writenbit;
if(img->chan == CMAP8)
return writecmap;
return writebyte;
}
static void
nullwrite(Param *p, uchar *s, Buffer b)
{
USED(p);
USED(s);
USED(b.grey);
}
static Buffer
readptr(Param *p, uchar *s, int y)
{
Buffer b;
uchar *q;
USED(s);
q = p->bytermin + y*p->bwidth;
b.red = q; /* ptr to data */
b.grn = b.blu = b.grey = b.alpha = nil;
b.rgba = (u32*)q;
b.delta = p->img->depth/8;
return b;
}
static Buffer
boolmemmove(Buffer bdst, Buffer bsrc, Buffer b1, int dx, int i, int o)
{
USED(i);
USED(o);
USED(b1.grey);
memmove(bdst.red, bsrc.red, dx*bdst.delta);
return bdst;
}
static Buffer
boolcopy8(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int i, int o)
{
uchar *m, *r, *w, *ew;
USED(i);
USED(o);
m = bmask.grey;
w = bdst.red;
r = bsrc.red;
ew = w+dx;
for(; w < ew; w++,r++)
if(*m++)
*w = *r;
return bdst; /* not used */
}
static Buffer
boolcopy16(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int i, int o)
{
uchar *m;
ushort *r, *w, *ew;
USED(i);
USED(o);
m = bmask.grey;
w = (ushort*)bdst.red;
r = (ushort*)bsrc.red;
ew = w+dx;
for(; w < ew; w++,r++)
if(*m++)
*w = *r;
return bdst; /* not used */
}
static Buffer
boolcopy24(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int i, int o)
{
uchar *m;
uchar *r, *w, *ew;
USED(i);
USED(o);
m = bmask.grey;
w = bdst.red;
r = bsrc.red;
ew = w+dx*3;
while(w < ew){
if(*m++){
*w++ = *r++;
*w++ = *r++;
*w++ = *r++;
}else{
w += 3;
r += 3;
}
}
return bdst; /* not used */
}
static Buffer
boolcopy32(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int i, int o)
{
uchar *m;
u32 *r, *w, *ew;
USED(i);
USED(o);
m = bmask.grey;
w = (u32*)bdst.red;
r = (u32*)bsrc.red;
ew = w+dx;
for(; w < ew; w++,r++)
if(*m++)
*w = *r;
return bdst; /* not used */
}
static Buffer
genconv(Param *p, uchar *buf, int y)
{
Buffer b;
int nb;
uchar *r, *w, *ew;
/* read from source into RGB format in convbuf */
b = p->convreadcall(p, p->convbuf, y);
/* write RGB format into dst format in buf */
p->convwritecall(p->convdpar, buf, b);
if(p->convdx){
nb = p->convdpar->img->depth/8;
r = buf;
w = buf+nb*p->dx;
ew = buf+nb*p->convdx;
while(w<ew)
*w++ = *r++;
}
b.red = buf;
b.blu = b.grn = b.grey = b.alpha = nil;
b.rgba = (u32*)buf;
b.delta = 0;
return b;
}
static Readfn*
convfn(Memimage *dst, Param *dpar, Memimage *src, Param *spar, int *ndrawbuf)
{
if(dst->chan == src->chan && !(src->flags&Frepl)){
//if(drawdebug) iprint("readptr...");
return readptr;
}
if(dst->chan==CMAP8 && (src->chan==GREY1||src->chan==GREY2||src->chan==GREY4)){
/* cheat because we know the replicated value is exactly the color map entry. */
//if(drawdebug) iprint("Readnbit...");
return readnbit;
}
spar->convreadcall = readfn(src);
spar->convwritecall = writefn(dst);
spar->convdpar = dpar;
/* allocate a conversion buffer */
spar->convbufoff = *ndrawbuf;
*ndrawbuf += spar->dx*4;
if(spar->dx > Dx(spar->img->r)){
spar->convdx = spar->dx;
spar->dx = Dx(spar->img->r);
}
//if(drawdebug) iprint("genconv...");
return genconv;
}
static u32
pixelbits(Memimage *i, Point pt)
{
uchar *p;
u32 val;
int off, bpp, npack;
val = 0;
p = byteaddr(i, pt);
switch(bpp=i->depth){
case 1:
case 2:
case 4:
npack = 8/bpp;
off = pt.x%npack;
val = p[0] >> bpp*(npack-1-off);
val &= (1<<bpp)-1;
break;
case 8:
val = p[0];
break;
case 16:
val = p[0]|(p[1]<<8);
break;
case 24:
val = p[0]|(p[1]<<8)|(p[2]<<16);
break;
case 32:
val = p[0]|(p[1]<<8)|(p[2]<<16)|(p[3]<<24);
break;
}
while(bpp<32){
val |= val<<bpp;
bpp *= 2;
}
return val;
}
static Calcfn*
boolcopyfn(Memimage *img, Memimage *mask)
{
if(mask->flags&Frepl && Dx(mask->r)==1 && Dy(mask->r)==1 && pixelbits(mask, mask->r.min)==~0)
return boolmemmove;
switch(img->depth){
case 8:
return boolcopy8;
case 16:
return boolcopy16;
case 24:
return boolcopy24;
case 32:
return boolcopy32;
default:
assert(0 /* boolcopyfn */);
}
return nil;
}
/*
* Optimized draw for filling and scrolling; uses memset and memmove.
*/
static void
memsetb(void *vp, uchar val, int n)
{
uchar *p, *ep;
p = vp;
ep = p+n;
while(p<ep)
*p++ = val;
}
static void
memset16(void *vp, ushort val, int n)
{
ushort *p, *ep;
p = vp;
ep = p+n;
while(p<ep)
*p++ = val;
}
static void
memset32(void *vp, u32 val, int n)
{
u32 *p, *ep;
p = vp;
ep = p+n;
while(p<ep)
*p++ = val;
}
static void
memset24(void *vp, u32 val, int n)
{
uchar *p, *ep;
uchar a,b,c;
p = vp;
ep = p+3*n;
a = val;
b = val>>8;
c = val>>16;
while(p<ep){
*p++ = a;
*p++ = b;
*p++ = c;
}
}
static u32
imgtorgba(Memimage *img, u32 val)
{
uchar r, g, b, a;
int nb, ov, v;
u32 chan;
uchar *p;
a = 0xFF;
r = g = b = 0xAA; /* garbage */
for(chan=img->chan; chan; chan>>=8){
nb = NBITS(chan);
ov = v = val&((1<<nb)-1);
val >>= nb;
while(nb < 8){
v |= v<<nb;
nb *= 2;
}
v >>= (nb-8);
switch(TYPE(chan)){
case CRed:
r = v;
break;
case CGreen:
g = v;
break;
case CBlue:
b = v;
break;
case CAlpha:
a = v;
break;
case CGrey:
r = g = b = v;
break;
case CMap:
p = img->cmap->cmap2rgb+3*ov;
r = *p++;
g = *p++;
b = *p;
break;
}
}
return (r<<24)|(g<<16)|(b<<8)|a;
}
static u32
rgbatoimg(Memimage *img, u32 rgba)
{
u32 chan;
int d, nb;
u32 v;
uchar *p, r, g, b, a, m;
v = 0;
r = rgba>>24;
g = rgba>>16;
b = rgba>>8;
a = rgba;
d = 0;
for(chan=img->chan; chan; chan>>=8){
nb = NBITS(chan);
switch(TYPE(chan)){
case CRed:
v |= (r>>(8-nb))<<d;
break;
case CGreen:
v |= (g>>(8-nb))<<d;
break;
case CBlue:
v |= (b>>(8-nb))<<d;
break;
case CAlpha:
v |= (a>>(8-nb))<<d;
break;
case CMap:
p = img->cmap->rgb2cmap;
m = p[(r>>4)*256+(g>>4)*16+(b>>4)];
v |= (m>>(8-nb))<<d;
break;
case CGrey:
m = RGB2K(r,g,b);
v |= (m>>(8-nb))<<d;
break;
}
d += nb;
}
// print("rgba2img %.8lux = %.*lux\n", rgba, 2*d/8, v);
return v;
}
#define DBG if(0)
static int
memoptdraw(Memdrawparam *par)
{
s32 m, y, dy, dx, op;
u32 v;
Memimage *src;
Memimage *dst;
dx = Dx(par->r);
dy = Dy(par->r);
src = par->src;
dst = par->dst;
op = par->op;
DBG print("state %ux mval %ux dd %d\n", par->state, par->mval, dst->depth);
/*
* If we have an opaque mask and source is one opaque pixel we can convert to the
* destination format and just replicate with memset.
*/
m = Simplesrc|Simplemask|Fullmask;
if((par->state&m)==m && (par->srgba&0xFF) == 0xFF && (op ==S || op == SoverD)){
uchar *dp, p[4];
s32 d, dwid, ppb, np, nb;
uchar lm, rm;
DBG print("Simplesrc|Simplemask|Fullmask\n");
DBG print("memopt, dst %p, dst->data->bdata %p\n", dst, dst->data->bdata);
dwid = dst->width*sizeof(u32);
dp = byteaddr(dst, par->r.min);
v = par->sdval;
DBG print("sdval %ud, depth %d\n", v, dst->depth);
switch(dst->depth){
case 1:
case 2:
case 4:
for(d=dst->depth; d<8; d*=2)
v |= (v<<d);
ppb = 8/dst->depth; /* pixels per byte */
m = ppb-1;
/* left edge */
np = par->r.min.x&m; /* no. pixels unused on left side of word */
dx -= (ppb-np);
nb = 8 - np * dst->depth; /* no. bits used on right side of word */
lm = (1<<nb)-1;
DBG print("np %d x %d nb %d lm %ux ppb %d m %ux\n", np, par->r.min.x, nb, lm, ppb, m);
/* right edge */
np = par->r.max.x&m; /* no. pixels used on left side of word */
dx -= np;
nb = 8 - np * dst->depth; /* no. bits unused on right side of word */
rm = ~((1<<nb)-1);
DBG print("np %d x %d nb %d rm %ux ppb %d m %ux\n", np, par->r.max.x, nb, rm, ppb, m);
DBG print("dx %d Dx %d\n", dx, Dx(par->r));
/* lm, rm are masks that are 1 where we should touch the bits */
if(dx < 0){ /* just one byte */
lm &= rm;
for(y=0; y<dy; y++, dp+=dwid)
*dp ^= (v ^ *dp) & lm;
}else if(dx == 0){ /* no full bytes */
if(lm)
dwid--;
for(y=0; y<dy; y++, dp+=dwid){
if(lm){
DBG print("dp %p v %ux lm %ux (v ^ *dp) & lm %ux\n", dp, v, lm, (v^*dp)&lm);
*dp ^= (v ^ *dp) & lm;
dp++;
}
*dp ^= (v ^ *dp) & rm;
}
}else{ /* full bytes in middle */
dx /= ppb;
if(lm)
dwid--;
dwid -= dx;
for(y=0; y<dy; y++, dp+=dwid){
if(lm){
*dp ^= (v ^ *dp) & lm;
dp++;
}
memset(dp, v, dx);
dp += dx;
*dp ^= (v ^ *dp) & rm;
}
}
return 1;
case 8:
for(y=0; y<dy; y++, dp+=dwid)
memset(dp, v, dx);
return 1;
case 16:
p[0] = v; /* make little endian */
p[1] = v>>8;
v = *(ushort*)p;
DBG print("dp=%p; dx=%d; for(y=0; y<%d; y++, dp+=%d)\nmemsets(dp, v, dx);\n",
dp, dx, dy, dwid);
for(y=0; y<dy; y++, dp+=dwid)
memset16(dp, v, dx);
return 1;
case 24:
for(y=0; y<dy; y++, dp+=dwid)
memset24(dp, v, dx);
return 1;
case 32:
p[0] = v; /* make little endian */
p[1] = v>>8;
p[2] = v>>16;
p[3] = v>>24;
v = *(u32*)p;
for(y=0; y<dy; y++, dp+=dwid)
memset32(dp, v, dx);
return 1;
default:
assert(0 /* bad dest depth in memoptdraw */);
}
}
/*
* If no source alpha, an opaque mask, we can just copy the
* source onto the destination. If the channels are the same and
* the source is not replicated, memmove suffices.
*/
m = Simplemask|Fullmask;
if((par->state&(m|Replsrc))==m && src->depth >= 8
&& src->chan == dst->chan && (op == S || (op == SoverD && !(src->flags&Falpha)))){
uchar *sp, *dp;
s32 swid, dwid, nb;
u32 dir;
DBG print("Simplemask|Fullmask\n");
if(src->data == dst->data && byteaddr(dst, par->r.min) > byteaddr(src, par->sr.min))
dir = -1;
else
dir = 1;
swid = src->width*sizeof(u32);
dwid = dst->width*sizeof(u32);
sp = byteaddr(src, par->sr.min);
dp = byteaddr(dst, par->r.min);
if(dir == -1){
sp += (dy-1)*swid;
dp += (dy-1)*dwid;
swid = -swid;
dwid = -dwid;
}
nb = (dx*src->depth)/8;
DBG print("swid %d dwid %d sp %p dp %p dir %d nb %d\n"
" dst %p dst->data->bdata %p dst->zero %d"
" dst->width %d dst->depth %d\n"
" par->r.min.x %d par->r.min.y %d\n",
swid, dwid, sp, dp, dir, nb,
dst, dst->data->bdata, dst->zero, dst->width, dst->depth,
par->r.min.x, par->r.min.y);
for(y=0; y<dy; y++, sp+=swid, dp+=dwid)
memmove(dp, sp, nb);
return 1;
}
/*
* If we have a 1-bit mask, 1-bit source, and 1-bit destination, and
* they're all bit aligned, we can just use bit operators. This happens
* when we're manipulating boolean masks, e.g. in the arc code.
*/
if((par->state&(Simplemask|Simplesrc|Replmask|Replsrc))==0
&& dst->chan==GREY1 && src->chan==GREY1 && par->mask->chan==GREY1
&& (par->r.min.x&7)==(par->sr.min.x&7) && (par->r.min.x&7)==(par->mr.min.x&7)){
uchar *sp, *dp, *mp;
uchar lm, rm;
s32 swid, dwid, mwid;
s32 i, x, dir;
DBG print("Simplemask|Simplesrc|Replmask|Replsrc");
sp = byteaddr(src, par->sr.min);
dp = byteaddr(dst, par->r.min);
mp = byteaddr(par->mask, par->mr.min);
swid = src->width*sizeof(u32);
dwid = dst->width*sizeof(u32);
mwid = par->mask->width*sizeof(u32);
if(src->data == dst->data && byteaddr(dst, par->r.min) > byteaddr(src, par->sr.min)){
dir = -1;
}else
dir = 1;
lm = 0xFF>>(par->r.min.x&7);
rm = 0xFF<<(8-(par->r.max.x&7));
dx -= (8-(par->r.min.x&7)) + (par->r.max.x&7);
if(dx < 0){ /* one byte wide */
lm &= rm;
if(dir == -1){
dp += dwid*(dy-1);
sp += swid*(dy-1);
mp += mwid*(dy-1);
dwid = -dwid;
swid = -swid;
mwid = -mwid;
}
for(y=0; y<dy; y++){
*dp ^= (*dp ^ *sp) & *mp & lm;
dp += dwid;
sp += swid;
mp += mwid;
}
return 1;
}
dx /= 8;
if(dir == 1){
i = (lm!=0)+dx+(rm!=0);
mwid -= i;
swid -= i;
dwid -= i;
for(y=0; y<dy; y++, dp+=dwid, sp+=swid, mp+=mwid){
if(lm){
*dp ^= (*dp ^ *sp++) & *mp++ & lm;
dp++;
}
for(x=0; x<dx; x++){
*dp ^= (*dp ^ *sp++) & *mp++;
dp++;
}
if(rm){
*dp ^= (*dp ^ *sp++) & *mp++ & rm;
dp++;
}
}
return 1;
}else{
/* dir == -1 */
i = (lm!=0)+dx+(rm!=0);
dp += dwid*(dy-1)+i-1;
sp += swid*(dy-1)+i-1;
mp += mwid*(dy-1)+i-1;
dwid = -dwid+i;
swid = -swid+i;
mwid = -mwid+i;
for(y=0; y<dy; y++, dp+=dwid, sp+=swid, mp+=mwid){
if(rm){
*dp ^= (*dp ^ *sp--) & *mp-- & rm;
dp--;
}
for(x=0; x<dx; x++){
*dp ^= (*dp ^ *sp--) & *mp--;
dp--;
}
if(lm){
*dp ^= (*dp ^ *sp--) & *mp-- & lm;
dp--;
}
}
}
return 1;
}
return 0;
}
#undef DBG
/*
* Boolean character drawing.
* Solid opaque color through a 1-bit greyscale mask.
*/
#define DBG if(0)
static int
chardraw(Memdrawparam *par)
{
u32 bits;
int i, ddepth, dy, dx, x, bx, ex, y, npack, bsh, depth, op;
u32 v, maskwid, dstwid;
uchar *wp, *rp, *q, *wc;
ushort *ws;
u32 *wl;
uchar sp[4];
Rectangle r, mr;
Memimage *mask, *src, *dst;
if(0) if(drawdebug) iprint("chardraw? mf %ux md %d sf %ux dxs %d dys %d dd %d ddat %p sdat %p\n",
par->mask->flags, par->mask->depth, par->src->flags,
Dx(par->src->r), Dy(par->src->r), par->dst->depth, par->dst->data, par->src->data);
mask = par->mask;
src = par->src;
dst = par->dst;
r = par->r;
mr = par->mr;
op = par->op;
if((par->state&(Replsrc|Simplesrc|Replmask)) != (Replsrc|Simplesrc)
|| mask->depth != 1 || src->flags&Falpha || dst->depth<8 || dst->data==src->data
|| op != SoverD)
return 0;
//if(drawdebug) iprint("chardraw...");
depth = mask->depth;
maskwid = mask->width*sizeof(u32);
rp = byteaddr(mask, mr.min);
npack = 8/depth;
bsh = (mr.min.x % npack) * depth;
wp = byteaddr(dst, r.min);
dstwid = dst->width*sizeof(u32);
DBG print("bsh %d\n", bsh);
dy = Dy(r);
dx = Dx(r);
ddepth = dst->depth;
/*
* for loop counts from bsh to bsh+dx
*
* we want the bottom bits to be the amount
* to shift the pixels down, so for n≡0 (mod 8) we want
* bottom bits 7. for n≡1, 6, etc.
* the bits come from -n-1.
*/
bx = -bsh-1;
ex = -bsh-1-dx;
bits = 0;
v = par->sdval;
/* make little endian */
sp[0] = v;
sp[1] = v>>8;
sp[2] = v>>16;
sp[3] = v>>24;
//print("sp %x %x %x %x\n", sp[0], sp[1], sp[2], sp[3]);
for(y=0; y<dy; y++, rp+=maskwid, wp+=dstwid){
q = rp;
if(bsh)
bits = *q++;
switch(ddepth){
case 8:
//if(drawdebug) iprint("8loop...");
wc = wp;
for(x=bx; x>ex; x--, wc++){
i = x&7;
if(i == 8-1)
bits = *q++;
DBG print("bits %ux sh %d...", bits, i);
if((bits>>i)&1)
*wc = v;
}
break;
case 16:
ws = (ushort*)wp;
v = *(ushort*)sp;
for(x=bx; x>ex; x--, ws++){
i = x&7;
if(i == 8-1)
bits = *q++;
DBG print("bits %ux sh %d...", bits, i);
if((bits>>i)&1)
*ws = v;
}
break;
case 24:
wc = wp;
for(x=bx; x>ex; x--, wc+=3){
i = x&7;
if(i == 8-1)
bits = *q++;
DBG print("bits %ux sh %d...", bits, i);
if((bits>>i)&1){
wc[0] = sp[0];
wc[1] = sp[1];
wc[2] = sp[2];
}
}
break;
case 32:
wl = (u32*)wp;
v = *(u32*)sp;
for(x=bx; x>ex; x--, wl++){
i = x&7;
if(i == 8-1)
bits = *q++;
DBG iprint("bits %ux sh %d...", bits, i);
if((bits>>i)&1)
*wl = v;
}
break;
}
}
DBG print("\n");
return 1;
}
#undef DBG
/*
* Fill entire byte with replicated (if necessary) copy of source pixel,
* assuming destination ldepth is >= source ldepth.
*
* This code is just plain wrong for >8bpp.
*
u32
membyteval(Memimage *src)
{
int i, val, bpp;
uchar uc;
unloadmemimage(src, src->r, &uc, 1);
bpp = src->depth;
uc <<= (src->r.min.x&(7/src->depth))*src->depth;
uc &= ~(0xFF>>bpp);
// pixel value is now in high part of byte. repeat throughout byte
val = uc;
for(i=bpp; i<8; i<<=1)
val |= val>>i;
return val;
}
*
*/
void
memfillcolor(Memimage *i, u32 val)
{
u32 bits;
int d, y;
uchar p[4];
if(val == DNofill)
return;
bits = rgbatoimg(i, val);
switch(i->depth){
case 24: /* 24-bit images suck */
for(y=i->r.min.y; y<i->r.max.y; y++)
memset24(byteaddr(i, Pt(i->r.min.x, y)), bits, Dx(i->r));
break;
default: /* 1, 2, 4, 8, 16, 32 */
for(d=i->depth; d<32; d*=2)
bits = (bits << d) | bits;
p[0] = bits; /* make little endian */
p[1] = bits>>8;
p[2] = bits>>16;
p[3] = bits>>24;
bits = *(u32*)p;
memset32(u32addr(i, i->r.min), bits, i->width*Dy(i->r));
break;
}
}