39 |
|
FILE *input; |
40 |
|
int xres, yres; |
41 |
|
COLR scanline[NCOLS]; |
42 |
– |
char sbuf[256]; |
42 |
|
int i; |
43 |
|
|
44 |
|
if (fname == NULL) { |
49 |
|
return(-1); |
50 |
|
} |
51 |
|
/* discard header */ |
52 |
< |
while (fgets(sbuf, sizeof(sbuf), input) != NULL && sbuf[0] != '\n') |
53 |
< |
; |
52 |
> |
if (checkheader(input, COLRFMT, NULL) < 0) { |
53 |
> |
fprintf(stderr, "%s: not a Radiance picture\n", fname); |
54 |
> |
return(-1); |
55 |
> |
} |
56 |
|
/* get picture dimensions */ |
57 |
|
if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) { |
58 |
|
fprintf(stderr, "%s: bad picture size\n", fname); |
70 |
|
fprintf(stderr, "%s: read error (y=%d)\n", fname, i); |
71 |
|
return(-1); |
72 |
|
} |
73 |
< |
normcolrs(scanline, xres); |
73 |
> |
normcolrs(scanline, xres, 0); |
74 |
|
plotscan(scanline, xres, i); |
75 |
|
} |
76 |
|
|
118 |
|
register int x; |
119 |
|
{ |
120 |
|
static int cerr[NCOLS]; |
121 |
< |
static int err; |
121 |
> |
static int err, errp; |
122 |
|
int b; |
123 |
|
register int isblack; |
124 |
|
|
125 |
|
b = normbright(clr); |
126 |
+ |
errp = err; |
127 |
|
err += b + cerr[x]; |
128 |
|
isblack = err < 128; |
129 |
|
if (!isblack) err -= 256; |
130 |
< |
cerr[x] = err /= 2; |
130 |
> |
err /= 3; |
131 |
> |
cerr[x] = err + errp; |
132 |
|
return(isblack); |
133 |
|
} |