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libmemdraw: fix CID 154389 (uninitialized variable)

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This commit is contained in:
Giacomo Tesio 2017-08-14 13:00:30 +02:00
parent 93c784fa3f
commit 8464d1a277
1 changed files with 38 additions and 37 deletions
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75
sys/src/lib/memdraw/draw.c
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@ -378,20 +378,20 @@ static uint8_t ones = 0xff;
typedef struct Buffer Buffer;
struct Buffer {
/* used by most routines */
uint8_t *red;
uint8_t *grn;
uint8_t *blu;
uint8_t *alpha;
uint8_t *grey;
uint32_t *rgba;
int delta; /* number of bytes to add to pointer to get next pixel to the right */
uint8_t* red;
uint8_t* grn;
uint8_t* blu;
uint8_t* alpha;
uint8_t* grey;
uint32_t* rgba;
int delta; /* number of bytes to add to pointer to get next pixel to the right */
/* used by boolcalc* for mask data */
uint8_t *m; /* ptr to mask data r.min byte; like p->bytermin */
uint8_t* m; /* ptr to mask data r.min byte; like p->bytermin */
int mskip; /* no. of left bits to skip in *m */
uint8_t *bm; /* ptr to mask data img->r.min byte; like p->bytey0s */
uint8_t* bm; /* ptr to mask data img->r.min byte; like p->bytey0s */
int bmskip; /* no. of left bits to skip in *bm */
uint8_t *em; /* ptr to mask data img->r.max.x byte; like p->bytey0e */
uint8_t* em; /* ptr to mask data img->r.max.x byte; like p->bytey0e */
int emskip; /* no. of right bits to skip in *em */
};
@ -406,36 +406,36 @@ enum {
/* giant rathole to customize functions with */
struct Param {
Readfn *replcall;
Readfn *greymaskcall;
Readfn *convreadcall;
Writefn *convwritecall;
Readfn* replcall;
Readfn* greymaskcall;
Readfn* convreadcall;
Writefn* convwritecall;
Memimage *img;
Memimage* img;
Rectangle r;
int dx; /* of r */
int needbuf;
int convgrey;
int alphaonly;
int dx; /* of r */
int needbuf;
int convgrey;
int alphaonly;
uint8_t *bytey0s; /* byteaddr(Pt(img->r.min.x, img->r.min.y)) */
uint8_t *bytermin; /* byteaddr(Pt(r.min.x, img->r.min.y)) */
uint8_t *bytey0e; /* byteaddr(Pt(img->r.max.x, img->r.min.y)) */
uint8_t* bytey0s; /* byteaddr(Pt(img->r.min.x, img->r.min.y)) */
uint8_t* bytermin; /* byteaddr(Pt(r.min.x, img->r.min.y)) */
uint8_t* bytey0e; /* byteaddr(Pt(img->r.max.x, img->r.min.y)) */
int bwidth;
int replcache; /* if set, cache buffers */
Buffer bcache[MAXBCACHE];
int replcache; /* if set, cache buffers */
Buffer bcache[MAXBCACHE];
uint32_t bfilled;
uint8_t *bufbase;
int bufoff;
int bufdelta;
uint8_t* bufbase;
int bufoff;
int bufdelta;
int dir;
int dir;
int convbufoff;
uint8_t *convbuf;
Param *convdpar;
int convdx;
int convbufoff;
uint8_t* convbuf;
Param* convdpar;
int convdx;
};
static Readfn greymaskread, replread, readptr;
@ -450,7 +450,7 @@ static Writefn* writefn(Memimage*);
static Calcfn* boolcopyfn(Memimage*, Memimage*);
static Readfn* convfn(Memimage*, Param*, Memimage*, Param*, int*);
static Calcfn *alphacalc[Ncomp] =
static Calcfn* alphacalc[Ncomp] =
{
alphacalc0, /* Clear */
alphacalc14, /* DoutS */
@ -488,10 +488,10 @@ static Calcfn *boolcalc[Ncomp] =
typedef struct Dbuf Dbuf;
struct Dbuf
{
uint8_t *p;
int n;
Param spar, mpar, dpar;
int inuse;
uint8_t* p;
int n;
Param spar, mpar, dpar;
int inuse;
};
static Dbuf dbuf[10];
@ -1672,6 +1672,7 @@ readptr(Param *p, uint8_t *s, int y)
uint8_t *q;
USED(s);
memset(&b, 0, sizeof(Buffer);
q = p->bytermin + y*p->bwidth;
b.red = q; /* ptr to data */
b.grn = b.blu = b.grey = b.alpha = nil;