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- #include <u.h>
- #include <libc.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)+128, ((t+((t>>8)&MASK02))>>8)&MASK02)
- #define MUL02(a, x, t) (t = (a)*(((x)&MASK02)>>0)+128, ((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)
- 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*);
- void
- memimageinit(void)
- {
- static int didinit = 0;
- if(didinit)
- return;
- didinit = 1;
- if(strcmp(imagmem->name, "Image") == 0 || strcmp(imagmem->name, "image") == 0)
- imagmem->move = 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 */
- memwhite = memones;
- memblack = memzeros;
- memopaque = memones;
- memtransparent = memzeros;
- }
- static ulong imgtorgba(Memimage*, ulong);
- static ulong rgbatoimg(Memimage*, ulong);
- static ulong pixelbits(Memimage*, Point);
- #define DBG if(0)
- void
- memimagedraw(Memimage *dst, Rectangle r, Memimage *src, Point p0, Memimage *mask, Point p1, int op)
- {
- static int n = 0;
- Memdrawparam par;
- if(mask == nil)
- mask = memopaque;
- DBG print("memimagedraw %p/%luX %R @ %p %p/%luX %P %p/%luX %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 %lux\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");
- }
- #undef DBG
- /*
- * 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))
- 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))
- return 0;
- if(!rectclip(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))
- return 0;
- if(!rectclip(mr, mask->clipr))
- 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))
- return 0;
- if(!rectclip(sr, mask->clipr))
- 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;
- }
- /*
- * Conversion tables.
- */
- static uchar replbit[1+8][256]; /* replbit[x][y] is the replication of the x-bit quantity y to 8-bit depth */
- static uchar conv18[256][8]; /* conv18[x][y] is the yth pixel in the depth-1 pixel x */
- static uchar conv28[256][4]; /* ... */
- static uchar conv48[256][2];
- /*
- * 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, mask, sh, 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;
- }
- }
- /* bit unpacking up to 8 bits, only powers of 2 */
- for(i=0; i<256; i++){
- for(j=0, sh=7, mask=1; j<8; j++, sh--)
- conv18[i][j] = replbit[1][(i>>sh)&mask];
- for(j=0, sh=6, mask=3; j<4; j++, sh-=2)
- conv28[i][j] = replbit[2][(i>>sh)&mask];
- for(j=0, sh=4, mask=15; j<2; j++, sh-=4)
- conv48[i][j] = replbit[4][(i>>sh)&mask];
- }
- }
- 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;
- ulong *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];
- ulong bfilled;
- uchar *bufbase;
- int bufoff;
- int bufdelta;
- int dir;
- int convbufoff;
- uchar *convbuf;
- Param *convdpar;
- int convdx;
- };
- static uchar *drawbuf;
- static int ndrawbuf;
- static int mdrawbuf;
- static Param spar, mpar, dpar; /* easier on the stacks */
- 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*);
- 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 */
- };
- static int
- allocdrawbuf(void)
- {
- uchar *p;
- if(ndrawbuf > mdrawbuf){
- p = realloc(drawbuf, ndrawbuf);
- if(p == nil){
- werrstr("memimagedraw out of memory");
- return -1;
- }
- drawbuf = p;
- mdrawbuf = ndrawbuf;
- }
- return 0;
- }
- static Param
- getparam(Memimage *img, Rectangle r, int convgrey, int needbuf)
- {
- Param p;
- 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(ulong)*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;
- return p;
- }
- 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;
- Buffer bsrc, bdst, bmask;
- Readfn *rdsrc, *rdmask, *rddst;
- Calcfn *calc;
- Writefn *wrdst;
- Memimage *src, *mask, *dst;
- Rectangle r, sr, mr;
- r = par->r;
- dx = Dx(r);
- dy = Dy(r);
- ndrawbuf = 0;
- 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);
- spar = getparam(src, sr, isgrey, needbuf);
- dpar = getparam(dst, r, isgrey, needbuf);
- mpar = getparam(mask, mr, 0, needbuf);
- dir = (needbuf && byteaddr(dst, r.min) > byteaddr(src, sr.min)) ? -1 : 1;
- spar.dir = mpar.dir = 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 %lud mchan %lux=?%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, &dpar, src, &spar);
- 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);
- 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);
- mpar.alphaonly = 1;
- }else{
- mpar.greymaskcall = readfn(mask);
- 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))
- calc = boolcalc[op];
- else if(op == SoverD && !(src->flags&Falpha))
- calc = alphacalcS;
- }
- }
- /*
- * If the image has a small enough repl rectangle,
- * we can just read each line once and cache them.
- */
- if(spar.replcache){
- spar.replcall = rdsrc;
- rdsrc = replread;
- }
- if(mpar.replcache){
- mpar.replcall = rdmask;
- rdmask = replread;
- }
- if(allocdrawbuf() < 0)
- return 0;
- /*
- * 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.
- */
- spar.bufbase = drawbuf+spar.bufoff;
- mpar.bufbase = drawbuf+mpar.bufoff;
- dpar.bufbase = drawbuf+dpar.bufoff;
- spar.convbuf = drawbuf+spar.convbufoff;
- if(dir == 1){
- starty = 0;
- endy = dy;
- }else{
- starty = dy-1;
- endy = -1;
- }
- /*
- * 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));
- for(y=starty; y!=endy; y+=dir, srcy+=dir, masky+=dir, dsty+=dir){
- clipy(src, &srcy);
- clipy(dst, &dsty);
- clipy(mask, &masky);
- bsrc = rdsrc(&spar, spar.bufbase, srcy);
- DBG print("[");
- bmask = rdmask(&mpar, mpar.bufbase, masky);
- DBG print("]\n");
- bdst = rddst(&dpar, dpar.bufbase, dsty);
- DBG dumpbuf("src", bsrc, dx);
- DBG dumpbuf("mask", bmask, dx);
- DBG dumpbuf("dst", bdst, dx);
- bdst = calc(bdst, bsrc, bmask, dx, isgrey, op);
- wrdst(&dpar, dpar.bytermin+dsty*dpar.bwidth, bdst);
- }
- return 1;
- }
- #undef DBG
- static Buffer
- alphacalc0(Buffer bdst, Buffer b1, Buffer b2, int dx, int grey, int op)
- {
- USED(grey);
- USED(op);
- USED(b1);
- USED(b2);
- 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, q;
- ulong s, t;
- obdst = bdst;
- sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
- 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(q){
- *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, q;
- ulong s, t;
- obdst = bdst;
- sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
- 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(q){
- *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, q;
- ulong s, t, u, v;
- obdst = bdst;
- sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
- 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(q){
- *bdst.rgba = MUL0123(fs, *bsrc.rgba, s, t)+MUL0123(fd, *bdst.rgba, u, v);
- 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(dx);
- USED(grey);
- USED(op);
- USED(b1);
- USED(b2);
- 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, q;
- ulong s, t, u, v;
- USED(op);
- obdst = bdst;
- sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
- 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(q){
- *bdst.rgba = MUL0123(ma, *bsrc.rgba, s, t)+MUL0123(fd, *bdst.rgba, u, v);
- 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;
- ulong s, t;
- USED(op);
- obdst = bdst;
- for(i=0; i<dx; 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{
- *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 = ma+MUL(fd, *bdst.alpha, t);
- bdst.alpha += bdst.delta;
- }
- bmask.alpha += bmask.delta;
- }
- 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);
- 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;
- ulong 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 = (ulong*)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;
- ulong 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 = (ulong*)(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;
- ulong 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 = (ulong*)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++ = brepl[(u >> img->shift[CBlue]) & img->mask[CBlue]];
- *w++ = grepl[(u >> img->shift[CGreen]) & img->mask[CGreen]];
- *w++ = rrepl[(u >> img->shift[CRed]) & img->mask[CRed]];
- }
- }
- r += nb;
- if(r == end)
- r = begin;
- }
-
- b.alpha = copyalpha ? buf : &ones;
- b.rgba = (ulong*)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;
- ulong 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 %.8lux...", u);
- u &= mask;
- DBG print("&mask %.8lux...", u);
- if(isgrey){
- u |= ((*grey >> (8-img->nbits[CGrey])) & img->mask[CGrey]) << img->shift[CGrey];
- DBG print("|grey %.8lux...", 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 %.8lux...", u);
- }
- if(isalpha){
- u |= ((*alpha >> (8-img->nbits[CAlpha])) & img->mask[CAlpha]) << img->shift[CAlpha];
- alpha += adelta;
- DBG print("|alpha %.8lux...", 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);
- }
- 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 = (ulong*)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);
- USED(bsrc);
- 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;
- ulong *r, *w, *ew;
- USED(i);
- USED(o);
- m = bmask.grey;
- w = (ulong*)bdst.red;
- r = (ulong*)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 = (ulong*)buf;
- b.delta = 0;
-
- return b;
- }
- static Readfn*
- convfn(Memimage *dst, Param *dpar, Memimage *src, Param *spar)
- {
- 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 ulong
- pixelbits(Memimage *i, Point pt)
- {
- uchar *p;
- ulong 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
- memsets(void *vp, ushort val, int n)
- {
- ushort *p, *ep;
- p = vp;
- ep = p+n;
- while(p<ep)
- *p++ = val;
- }
- static void
- memsetl(void *vp, ulong val, int n)
- {
- ulong *p, *ep;
- p = vp;
- ep = p+n;
- while(p<ep)
- *p++ = val;
- }
- static void
- memset24(void *vp, ulong 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 ulong
- imgtorgba(Memimage *img, ulong val)
- {
- uchar r, g, b, a;
- int nb, ov, v;
- ulong 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 ulong
- rgbatoimg(Memimage *img, ulong rgba)
- {
- ulong chan;
- int d, nb;
- ulong 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)
- {
- int m, y, dy, dx, op;
- ulong 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 %lux mval %lux 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];
- int d, dwid, ppb, np, nb;
- uchar lm, rm;
- DBG print("memopt, dst %p, dst->data->bdata %p\n", dst, dst->data->bdata);
- dwid = dst->width*sizeof(ulong);
- dp = byteaddr(dst, par->r.min);
- v = par->sdval;
- DBG print("sdval %lud, 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 %lux lm %ux (v ^ *dp) & lm %lux\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)
- memsets(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 = *(ulong*)p;
- for(y=0; y<dy; y++, dp+=dwid)
- memsetl(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 && !(src->flags&Falpha) && (op == S || op == SoverD)){
- uchar *sp, *dp;
- long swid, dwid, nb;
- int dir;
- if(src->data == dst->data && byteaddr(dst, par->r.min) > byteaddr(src, par->sr.min))
- dir = -1;
- else
- dir = 1;
- swid = src->width*sizeof(ulong);
- dwid = dst->width*sizeof(ulong);
- 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;
- 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;
- long swid, dwid, mwid;
- int i, x, dir;
- sp = byteaddr(src, par->sr.min);
- dp = byteaddr(dst, par->r.min);
- mp = byteaddr(par->mask, par->mr.min);
- swid = src->width*sizeof(ulong);
- dwid = dst->width*sizeof(ulong);
- mwid = par->mask->width*sizeof(ulong);
- 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)
- {
- ulong bits;
- int i, ddepth, dy, dx, x, bx, ex, y, npack, bsh, depth, op;
- ulong v, maskwid, dstwid;
- uchar *wp, *rp, *q, *wc;
- ushort *ws;
- ulong *wl;
- uchar sp[4];
- Rectangle r, mr;
- Memimage *mask, *src, *dst;
- if(0) if(drawdebug) iprint("chardraw? mf %lux md %d sf %lux 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(ulong);
- rp = byteaddr(mask, mr.min);
- npack = 8/depth;
- bsh = (mr.min.x % npack) * depth;
- wp = byteaddr(dst, r.min);
- dstwid = dst->width*sizeof(ulong);
- 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;
- SET(bits);
- 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 %lux 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 %lux 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 %lux sh %d...", bits, i);
- if((bits>>i)&1){
- wc[0] = sp[0];
- wc[1] = sp[1];
- wc[2] = sp[2];
- }
- }
- break;
- case 32:
- wl = (ulong*)wp;
- v = *(ulong*)sp;
- for(x=bx; x>ex; x--, wl++){
- i = x&7;
- if(i == 8-1)
- bits = *q++;
- DBG iprint("bits %lux 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.
- *
- ulong
- 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, ulong val)
- {
- ulong bits;
- int d, y;
- 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;
- memsetl(wordaddr(i, i->r.min), bits, i->width*Dy(i->r));
- break;
- }
- }
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