static int
_gd2ReadChunk (int offset, char *compBuf, int compSize, char *chunkBuf,
uLongf * chunkLen, gdIOCtx * in)
{
int zerr;
if (gdTell (in) != offset) {
GD2_DBG (printf ("Positioning in file to %d\n", offset));
gdSeek (in, offset);
} else {
GD2_DBG (printf ("Already Positioned in file to %d\n", offset));
};
/* Read and uncompress an entire chunk. */
GD2_DBG (printf ("Reading file\n"));
if (gdGetBuf (compBuf, compSize, in) != compSize) {
return FALSE;
};
GD2_DBG (printf
("Got %d bytes. Uncompressing into buffer of %d bytes\n", compSize,
*chunkLen));
zerr =
uncompress ((unsigned char *) chunkBuf, chunkLen,
(unsigned char *) compBuf, compSize);
if (zerr != Z_OK) {
GD2_DBG (printf ("Error %d from uncompress\n", zerr));
return FALSE;
};
GD2_DBG (printf ("Got chunk\n"));
return TRUE;
}
static void
_gdImageGd2 (gdImagePtr im, gdIOCtx * out, int cs, int fmt)
{
int ncx, ncy, cx, cy;
int x, y, ylo, yhi, xlo, xhi;
int chunkLen;
int chunkNum = 0;
char *chunkData = NULL; /* So we can gdFree it with impunity. */
char *compData = NULL; /* So we can gdFree it with impunity. */
uLongf compLen;
int idxPos = 0;
int idxSize;
t_chunk_info *chunkIdx = NULL;
int posSave;
int bytesPerPixel = im->trueColor ? 4 : 1;
int compMax = 0;
/*printf("Trying to write GD2 file\n"); */
/* */
/* Force fmt to a valid value since we don't return anything. */
/* */
if ((fmt != GD2_FMT_RAW) && (fmt != GD2_FMT_COMPRESSED))
{
fmt = im->trueColor ? GD2_FMT_TRUECOLOR_COMPRESSED : GD2_FMT_COMPRESSED;
};
if (im->trueColor)
{
fmt += 2;
}
/* */
/* Make sure chunk size is valid. These are arbitrary values; 64 because it seems */
/* a little silly to expect performance improvements on a 64x64 bit scale, and */
/* 4096 because we buffer one chunk, and a 16MB buffer seems a little large - it may be */
/* OK for one user, but for another to read it, they require the buffer. */
/* */
if (cs == 0)
{
cs = GD2_CHUNKSIZE;
}
else if (cs < GD2_CHUNKSIZE_MIN)
{
cs = GD2_CHUNKSIZE_MIN;
}
else if (cs > GD2_CHUNKSIZE_MAX)
{
cs = GD2_CHUNKSIZE_MAX;
};
/* Work out number of chunks. */
ncx = im->sx / cs + 1;
ncy = im->sy / cs + 1;
/* Write the standard header. */
_gd2PutHeader (im, out, cs, fmt, ncx, ncy);
if (gd2_compressed (fmt))
{
/* */
/* Work out size of buffer for compressed data, If CHUNKSIZE is large, */
/* then these will be large! */
/* */
/* The zlib notes say output buffer size should be (input size) * 1.01 * 12 */
/* - we'll use 1.02 to be paranoid. */
/* */
compMax = cs * bytesPerPixel * cs * 1.02 + 12;
/* */
/* Allocate the buffers. */
/* */
chunkData = gdCalloc (cs * bytesPerPixel * cs, 1);
if (!chunkData) {
goto fail;
}
compData = gdCalloc (compMax, 1);
if (!compData) {
goto fail;
}
/* */
/* Save the file position of chunk index, and allocate enough space for */
/* each chunk_info block . */
/* */
idxPos = gdTell (out);
idxSize = ncx * ncy * sizeof (t_chunk_info);
GD2_DBG (printf ("Index size is %d\n", idxSize));
gdSeek (out, idxPos + idxSize);
chunkIdx = gdCalloc (idxSize * sizeof (t_chunk_info), 1);
if (!chunkIdx) {
goto fail;
}
};
_gdPutColors (im, out);
GD2_DBG (printf ("Size: %dx%d\n", im->sx, im->sy));
GD2_DBG (printf ("Chunks: %dx%d\n", ncx, ncy));
for (cy = 0; (cy < ncy); cy++)
{
for (cx = 0; (cx < ncx); cx++)
{
ylo = cy * cs;
yhi = ylo + cs;
if (yhi > im->sy)
{
yhi = im->sy;
};
GD2_DBG (printf
("Processing Chunk (%dx%d), y from %d to %d\n", cx, cy,
ylo, yhi));
chunkLen = 0;
for (y = ylo; (y < yhi); y++)
{
/*GD2_DBG(printf("y=%d: ",y)); */
xlo = cx * cs;
xhi = xlo + cs;
if (xhi > im->sx)
{
xhi = im->sx;
};
if (gd2_compressed (fmt))
{
for (x = xlo; x < xhi; x++)
{
/* 2.0.11: use truecolor pixel array. TBB */
/*GD2_DBG(printf("%d...",x)); */
if (im->trueColor)
{
int p = im->tpixels[y][x];
chunkData[chunkLen++] = gdTrueColorGetAlpha (p);
chunkData[chunkLen++] = gdTrueColorGetRed (p);
chunkData[chunkLen++] = gdTrueColorGetGreen (p);
chunkData[chunkLen++] = gdTrueColorGetBlue (p);
}
else
{
int p = im->pixels[y][x];
chunkData[chunkLen++] = p;
}
};
}
else
{
for (x = xlo; x < xhi; x++)
{
/*GD2_DBG(printf("%d, ",x)); */
if (im->trueColor)
{
gdPutInt (im->tpixels[y][x], out);
}
else
{
gdPutC ((unsigned char) im->pixels[y][x], out);
}
};
};
/*GD2_DBG(printf("y=%d done.\n",y)); */
};
if (gd2_compressed (fmt))
{
compLen = compMax;
if (compress ((unsigned char *)
&compData[0], &compLen,
(unsigned char *) &chunkData[0],
chunkLen) != Z_OK)
{
printf ("Error from compressing\n");
}
else
{
chunkIdx[chunkNum].offset = gdTell (out);
chunkIdx[chunkNum++].size = compLen;
GD2_DBG (printf
("Chunk %d size %d offset %d\n", chunkNum,
chunkIdx[chunkNum - 1].size,
chunkIdx[chunkNum - 1].offset));
if (gdPutBuf (compData, compLen, out) <= 0)
{
fprintf(stderr, "gd write error\n");
};
};
};
};
};
if (gd2_compressed (fmt))
{
/* Save the position, write the index, restore position (paranoia). */
GD2_DBG (printf ("Seeking %d to write index\n", idxPos));
posSave = gdTell (out);
gdSeek (out, idxPos);
GD2_DBG (printf ("Writing index\n"));
for (x = 0; x < chunkNum; x++)
{
GD2_DBG (printf
("Chunk %d size %d offset %d\n", x, chunkIdx[x].size,
chunkIdx[x].offset));
gdPutInt (chunkIdx[x].offset, out);
gdPutInt (chunkIdx[x].size, out);
};
/* We don't use fwrite for *endian reasons. */
/*fwrite(chunkIdx, sizeof(int)*2, chunkNum, out); */
gdSeek (out, posSave);
};
/*printf("Memory block size is %d\n",gdTell(out)); */
fail:
GD2_DBG (printf ("Freeing memory\n"));
if (chunkData) {
gdFree (chunkData);
}
if (compData) {
gdFree (compData);
}
if (chunkIdx) {
gdFree (chunkIdx);
}
GD2_DBG (printf ("Done\n"));
}
BGD_DECLARE(gdImagePtr) gdImageCreateFromGd2PartCtx (gdIOCtx * in, int srcx, int srcy, int w, int h)
{
int scx, scy, ecx, ecy, fsx, fsy;
int nc, ncx, ncy, cs, cx, cy;
int x, y, ylo, yhi, xlo, xhi;
int dstart, dpos;
int i;
/* 2.0.12: unsigned is correct; fixes problems with color munging.
Thanks to Steven Brown. */
unsigned int ch;
int vers, fmt;
t_chunk_info *chunkIdx = NULL;
unsigned char *chunkBuf = NULL;
int chunkNum;
int chunkMax = 0;
uLongf chunkLen;
int chunkPos = 0;
int compMax;
char *compBuf = NULL;
gdImagePtr im;
/* */
/* The next few lines are basically copied from gd2CreateFromFile */
/* - we change the file size, so don't want to use the code directly. */
/* but we do need to know the file size. */
/* */
if (_gd2GetHeader (in, &fsx, &fsy, &cs, &vers, &fmt, &ncx, &ncy, &chunkIdx)
!= 1)
{
goto fail1;
}
GD2_DBG (printf ("File size is %dx%d\n", fsx, fsy));
/* This is the difference - make a file based on size of chunks. */
if (gd2_truecolor (fmt))
{
im = gdImageCreateTrueColor (w, h);
}
else
{
im = gdImageCreate (w, h);
}
if (im == NULL)
{
goto fail1;
};
if (!_gdGetColors (in, im, vers == 2))
{
goto fail2;
}
GD2_DBG (printf ("Image palette completed: %d colours\n", im->colorsTotal));
/* Process the header info */
nc = ncx * ncy;
if (gd2_compressed (fmt))
{
/* Find the maximum compressed chunk size. */
compMax = 0;
for (i = 0; (i < nc); i++)
{
if (chunkIdx[i].size > compMax)
{
compMax = chunkIdx[i].size;
};
};
compMax++;
if (im->trueColor)
{
chunkMax = cs * cs * 4;
}
else
{
chunkMax = cs * cs;
}
chunkBuf = gdCalloc (chunkMax, 1);
if (!chunkBuf) {
goto fail2;
}
compBuf = gdCalloc (compMax, 1);
if (!compBuf) {
goto fail2;
}
};
/* Don't bother with this... */
/* if ( (ncx != sx / cs) || (ncy != sy / cs)) { */
/* goto fail2; */
/* }; */
/* Work out start/end chunks */
scx = srcx / cs;
scy = srcy / cs;
if (scx < 0)
{
scx = 0;
};
if (scy < 0)
{
scy = 0;
};
ecx = (srcx + w) / cs;
ecy = (srcy + h) / cs;
if (ecx >= ncx)
{
ecx = ncx - 1;
};
if (ecy >= ncy)
{
ecy = ncy - 1;
};
/* Remember file position of image data. */
dstart = gdTell (in);
GD2_DBG (printf ("Data starts at %d\n", dstart));
/* Loop through the chunks. */
for (cy = scy; (cy <= ecy); cy++)
{
ylo = cy * cs;
yhi = ylo + cs;
if (yhi > fsy)
{
yhi = fsy;
};
for (cx = scx; (cx <= ecx); cx++)
{
xlo = cx * cs;
xhi = xlo + cs;
if (xhi > fsx)
{
xhi = fsx;
};
GD2_DBG (printf
("Processing Chunk (%d, %d), from %d to %d\n", cx, cy, ylo,
yhi));
if (!gd2_compressed (fmt))
{
GD2_DBG (printf ("Using raw format data\n"));
if (im->trueColor)
{
dpos =
(cy * (cs * fsx) * 4 + cx * cs * (yhi - ylo) * 4) +
dstart;
}
else
{
dpos = cy * (cs * fsx) + cx * cs * (yhi - ylo) + dstart;
}
/* gd 2.0.11: gdSeek returns TRUE on success, not 0.
Longstanding bug. 01/16/03 */
if (!gdSeek (in, dpos))
{
fprintf (stderr, "Seek error\n");
goto fail2;
};
GD2_DBG (printf
("Reading (%d, %d) from position %d\n", cx, cy,
dpos - dstart));
}
else
{
chunkNum = cx + cy * ncx;
chunkLen = chunkMax;
if (!_gd2ReadChunk (chunkIdx[chunkNum].offset,
compBuf,
chunkIdx[chunkNum].size,
(char *) chunkBuf, &chunkLen, in))
{
printf ("Error reading comproessed chunk\n");
goto fail2;
};
chunkPos = 0;
GD2_DBG (printf
("Reading (%d, %d) from chunk %d\n", cx, cy,
chunkNum));
};
GD2_DBG (printf
(" into (%d, %d) - (%d, %d)\n", xlo, ylo, xhi, yhi));
for (y = ylo; (y < yhi); y++)
{
for (x = xlo; x < xhi; x++)
{
if (!gd2_compressed (fmt))
{
if (im->trueColor)
{
if (!gdGetInt ((int *) &ch, in))
{
ch = 0;
/*printf("EOF while reading file\n"); */
/*goto fail2; */
}
}
else
{
ch = gdGetC (in);
if ((int) ch == EOF)
{
ch = 0;
/*printf("EOF while reading file\n"); */
/*goto fail2; */
}
}
}
else
{
if (im->trueColor)
{
ch = chunkBuf[chunkPos++];
ch = (ch << 8) + chunkBuf[chunkPos++];
ch = (ch << 8) + chunkBuf[chunkPos++];
ch = (ch << 8) + chunkBuf[chunkPos++];
}
else
{
ch = chunkBuf[chunkPos++];
}
};
/* Only use a point that is in the image. */
if ((x >= srcx) && (x < (srcx + w)) && (x < fsx) && (x >= 0)
&& (y >= srcy) && (y < (srcy + h)) && (y < fsy)
&& (y >= 0))
{
/* 2.0.11: tpixels */
if (im->trueColor)
{
im->tpixels[y - srcy][x - srcx] = ch;
}
else
{
im->pixels[y - srcy][x - srcx] = ch;
}
}
};
};
};
};
gdFree (chunkBuf);
gdFree (compBuf);
gdFree (chunkIdx);
return im;
fail2:
gdImageDestroy (im);
fail1:
if (chunkBuf) {
gdFree (chunkBuf);
}
if (compBuf) {
gdFree (compBuf);
}
if (chunkIdx) {
gdFree (chunkIdx);
}
return 0;
}
