| 108 |
|
return(ferror(fp) ? -1 : 0); |
| 109 |
|
} |
| 110 |
|
|
| 111 |
< |
|
| 111 |
> |
/* |
| 112 |
> |
* An old-format scanline is either a stream of valid RGBE or XYZE real |
| 113 |
> |
* pixels or at least one real pixel followed by some number of |
| 114 |
> |
* invalid real pixels of the form (1,1,1,n), where n is a count. |
| 115 |
> |
* These can themselves be repeated to create a multibyte repeat |
| 116 |
> |
* count, with the least significant byte first (little-endian order.) |
| 117 |
> |
* Repeat counts are limited by the size of an int; if a repetition |
| 118 |
> |
* leads to an overrun, the rest of the the repetition will be |
| 119 |
> |
* silently ignored. |
| 120 |
> |
*/ |
| 121 |
|
static int |
| 122 |
|
oldreadcolrs( /* read in an old-style colr scanline */ |
| 123 |
|
COLR *scanline, |
| 155 |
|
return(0); |
| 156 |
|
} |
| 157 |
|
|
| 158 |
< |
|
| 158 |
> |
/* |
| 159 |
> |
* There are two scanline formats: old and new. The old format |
| 160 |
> |
* compresses runs of RGBE or XYZE four-byte real pixels; the new |
| 161 |
> |
* format breaks the pixels into R, G, B, and E lines (or XYZE lines) |
| 162 |
> |
* which are individually run-length encoded. |
| 163 |
> |
* |
| 164 |
> |
* An old-format scanline always begins with a valid real pixel; at |
| 165 |
> |
* least one of the RGB (or XYZ) values will have its high-order bit |
| 166 |
> |
* set. A new-format scanline begins with four bytes which are not a |
| 167 |
> |
* valid real pixel: (2, 2, lenhigh, lenlow) where lenhigh is always |
| 168 |
> |
* less than 128 and hence never has a high-order bit set. |
| 169 |
> |
* |
| 170 |
> |
* A new-format scanline is broken into its RGBE or XYZE components. |
| 171 |
> |
* Each is output and run-length encoded separately so that a scanline |
| 172 |
> |
* is broken into four records. In turn, each record is organized |
| 173 |
> |
* into chunks of up to 128 characters, which begin with a count byte. |
| 174 |
> |
* If the count byte is greater than 128, the following data byte is |
| 175 |
> |
* repeated (count-128) times. If not, the count byte is followed by |
| 176 |
> |
* that many data bytes. |
| 177 |
> |
*/ |
| 178 |
|
int |
| 179 |
|
freadcolrs( /* read in an encoded colr scanline */ |
| 180 |
|
COLR *scanline, |
