#include "image.h"
-#include "io.h"
#include "log.h"
#include "iolayer.h"
unsigned int colormap;
} rgb_header;
+typedef struct {
+ int start, length;
+} stlen_pair;
typedef enum { NoInit, Raw, Rle } rle_state;
-typedef struct {
- int compressed;
- int bytepp;
- rle_state state;
- unsigned char cval[4];
- int len;
- unsigned char hdr;
- io_glue *ig;
-} rgb_source;
typedef struct {
-/*
- * Packing functions - used for (un)packing
- * datastructures into raw bytes.
- */
-
-
-/*
-=item find_repeat
-
-Helper function for rle compressor to find the next triple repeat of the
-same pixel value in buffer.
-
- buf - buffer
- length - number of pixel values in buffer
- bytepp - number of bytes in a pixel value
-
-=cut
-*/
-
-static
-int
-find_repeat(unsigned char *buf, int length, int bytepp) {
- int i = 0;
-
- while(i<length-1) {
- if(memcmp(buf+i*bytepp, buf+(i+1)*bytepp, bytepp) == 0) {
- if (i == length-2) return -1;
- if (memcmp(buf+(i+1)*bytepp, buf+(i+2)*bytepp,bytepp) == 0)
- return i;
- else i++;
- }
- i++;
- }
- return -1;
-}
-
-
-/*
-=item find_span
-
-Helper function for rle compressor to find the length of a span where
-the same pixel value is in the buffer.
-
- buf - buffer
- length - number of pixel values in buffer
- bytepp - number of bytes in a pixel value
-
-=cut
-*/
-
-static
-int
-find_span(unsigned char *buf, int length, int bytepp) {
- int i = 0;
- while(i<length) {
- if(memcmp(buf, buf+(i*bytepp), bytepp) != 0) return i;
- i++;
- }
- return length;
-}
/*
}
-/*
-=item rgb_source_read(s, buf, pixels)
-
-Reads pixel number of pixels from source s into buffer buf. Takes
-care of decompressing the stream if needed.
-
- s - data source
- buf - destination buffer
- pixels - number of pixels to put into buffer
-
-=cut
-*/
-
-static
-int
-rgb_source_read(rgb_source *s, unsigned char *buf, size_t pixels) {
- int cp = 0, j, k;
- if (!s->compressed) {
- if (s->ig->readcb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
- return 1;
- }
-
- while(cp < pixels) {
- int ml;
- if (s->len == 0) s->state = NoInit;
- switch (s->state) {
- case NoInit:
- if (s->ig->readcb(s->ig, &s->hdr, 1) != 1) return 0;
-
- s->len = (s->hdr &~(1<<7))+1;
- s->state = (s->hdr & (1<<7)) ? Rle : Raw;
- {
- static cnt = 0;
- printf("%04d %s: %d\n", cnt++, s->state==Rle?"RLE":"RAW", s->len);
- }
- if (s->state == Rle && s->ig->readcb(s->ig, s->cval, s->bytepp) != s->bytepp) return 0;
-
- break;
- case Rle:
- ml = min(s->len, pixels-cp);
- for(k=0; k<ml; k++) for(j=0; j<s->bytepp; j++)
- buf[(cp+k)*s->bytepp+j] = s->cval[j];
- cp += ml;
- s->len -= ml;
- break;
- case Raw:
- ml = min(s->len, pixels-cp);
- if (s->ig->readcb(s->ig, buf+cp*s->bytepp, ml*s->bytepp) != ml*s->bytepp) return 0;
- cp += ml;
- s->len -= ml;
- break;
- }
- }
- return 1;
-}
-
static
int
rgb_dest_write(rgb_dest *s, unsigned char *buf, size_t pixels) {
- int cp = 0, j, k;
- if (!s->compressed) {
- if (s->ig->writecb(s->ig, buf, pixels*s->bytepp) != pixels*s->bytepp) return 0;
- return 1;
- }
-
- while(cp < pixels) {
- int tlen;
- int nxtrip = find_repeat(buf+cp*s->bytepp, pixels-cp, s->bytepp);
- tlen = (nxtrip == -1) ? pixels-cp : nxtrip;
- while(tlen) {
- unsigned char clen = (tlen>128) ? 128 : tlen;
- clen--;
- if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
- clen++;
- if (s->ig->writecb(s->ig, buf+cp*s->bytepp, clen*s->bytepp) != clen*s->bytepp) return 0;
- tlen -= clen;
- cp += clen;
- }
- if (cp >= pixels) break;
- tlen = find_span(buf+cp*s->bytepp, pixels-cp, s->bytepp);
- if (tlen <3) continue;
- while (tlen) {
- unsigned char clen = (tlen>128) ? 128 : tlen;
- clen = (clen - 1) | 0x80;
- if (s->ig->writecb(s->ig, &clen, 1) != 1) return 0;
- clen = (clen & ~0x80) + 1;
- if (s->ig->writecb(s->ig, buf+cp*s->bytepp, s->bytepp) != s->bytepp) return 0;
- tlen -= clen;
- cp += clen;
- }
- }
- return 1;
}
int x, y, c,i;
int width, height, channels;
unsigned long maxlen;
+
+ int savemask;
char *idstring = NULL;
- rgb_source src;
rgb_header header;
unsigned char headbuf[512];
unsigned char *databuf;
channels = header.zsize;
img = i_img_empty_ch(NULL, width, height, channels);
+ if (!img)
+ return NULL;
i_tags_add(&img->tags, "rgb_namestr", 0, header.name, 80, 0);
+ i_tags_add(&img->tags, "i_format", 0, "rgb", -1, 0);
switch (header.storagetype) {
case 0: /* uncompressed */
+ linebuf = i_mempool_alloc(&mp, width*sizeof(i_color));
+ databuf = i_mempool_alloc(&mp, width);
+
+ savemask = i_img_getmask(img);
+
+ for(c=0; c<channels; c++) {
+ i_img_setmask(img, 1<<c);
+ for(y=0; y<height; y++) {
+ int x;
+
+ if (ig->readcb(ig, databuf, width) != width) {
+ i_push_error(0, "SGI rgb: cannot read");
+ goto ErrorReturn;
+ }
+
+ for(x=0; x<width; x++)
+ linebuf[x].channel[c] = databuf[x];
+
+ i_plin(img, 0, width, height-1-y, linebuf);
+ }
+ }
+ i_img_setmask(img, savemask);
break;
case 1: /* RLE compressed */
break;
}
+ i_tags_add(&img->tags, "i_format", 0, "rgb", -1, 0);
+
i_mempool_destroy(&mp);
return img;
undef_int
i_writergb_wiol(i_img *img, io_glue *ig, int wierdpack, int compress, char *idstring, size_t idlen) {
-
-
-
+ i_clear_error();
+ i_push_error(0, "writing SGI RGB files is not implemented");
+ return 0;
}
projects / imager.git / blobdiff