static gdImagePtr _gd2CreateFromFile (gdIOCtxPtr in, int *sx, int *sy, int *cs, int *vers, int *fmt, int *ncx, int *ncy, t_chunk_info ** cidx)
{
gdImagePtr im;
if (_gd2GetHeader (in, sx, sy, cs, vers, fmt, ncx, ncy, cidx) != 1) {
GD2_DBG(php_gd_error("Bad GD2 header"));
goto fail1;
}
if (gd2_truecolor(*fmt)) {
im = gdImageCreateTrueColor(*sx, *sy);
} else {
im = gdImageCreate(*sx, *sy);
}
if (im == NULL) {
GD2_DBG(php_gd_error("Could not create gdImage"));
goto fail2;
}
if (!_gdGetColors(in, im, (*vers) == 2)) {
GD2_DBG(php_gd_error("Could not read color palette"));
goto fail3;
}
GD2_DBG(php_gd_error("Image palette completed: %d colours", im->colorsTotal));
return im;
fail3:
gdImageDestroy(im);
fail2:
gdFree(*cidx);
fail1:
return 0;
}
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;
}