void imb_loadtiletiff(ImBuf *ibuf, unsigned char *mem, size_t size, int tx, int ty, unsigned int *rect)
{
TIFF *image = NULL;
uint32 width, height;
ImbTIFFMemFile memFile;
image = imb_tiff_client_open(&memFile, mem, size);
if(image == NULL) {
printf("imb_loadtiff: could not open TIFF IO layer for loading mipmap level.\n");
return;
}
if(TIFFSetDirectory(image, ibuf->miplevel)) {
/* allocate the image buffer */
TIFFGetField(image, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(image, TIFFTAG_IMAGELENGTH, &height);
if(width == ibuf->x && height == ibuf->y) {
if(rect) {
/* tiff pixels are bottom to top, tiles are top to bottom */
if(TIFFReadRGBATile(image, tx*ibuf->tilex, (ibuf->ytiles - 1 - ty)*ibuf->tiley, rect) == 1) {
if(ibuf->tiley > ibuf->y)
memmove(rect, rect+ibuf->tilex*(ibuf->tiley - ibuf->y), sizeof(int)*ibuf->tilex*ibuf->y);
if(ibuf->flags & IB_premul)
IMB_premultiply_rect(rect, 32, ibuf->tilex, ibuf->tiley);
}
else
printf("imb_loadtiff: failed to read tiff tile at mipmap level %d\n", ibuf->miplevel);
}
}
else
printf("imb_loadtiff: mipmap level %d has unexpected size %dx%d instead of %dx%d\n", ibuf->miplevel, width, height, ibuf->x, ibuf->y);
}
else
printf("imb_loadtiff: could not find mipmap level %d\n", ibuf->miplevel);
/* close the client layer interface to the in-memory file */
TIFFClose(image);
}
/**
* Loads a TIFF file.
*
*
* \param mem: Memory containing the TIFF file.
* \param size: Size of the mem buffer.
* \param flags: If flags has IB_test set then the file is not actually loaded,
* but all other operations take place.
*
* \return: A newly allocated ImBuf structure if successful, otherwise NULL.
*/
ImBuf *imb_loadtiff(unsigned char *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
{
TIFF *image = NULL;
ImBuf *ibuf = NULL, *hbuf;
ImbTIFFMemFile memFile;
uint32 width, height;
char *format = NULL;
int level;
short spp;
int ib_depth;
/* check whether or not we have a TIFF file */
if (size < IMB_TIFF_NCB) {
fprintf(stderr, "imb_loadtiff: size < IMB_TIFF_NCB\n");
return NULL;
}
if (imb_is_a_tiff(mem) == 0)
return NULL;
/* both 8 and 16 bit PNGs are default to standard byte colorspace */
colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
image = imb_tiff_client_open(&memFile, mem, size);
if (image == NULL) {
printf("imb_loadtiff: could not open TIFF IO layer.\n");
return NULL;
}
/* allocate the image buffer */
TIFFGetField(image, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(image, TIFFTAG_IMAGELENGTH, &height);
TIFFGetField(image, TIFFTAG_SAMPLESPERPIXEL, &spp);
ib_depth = (spp == 3) ? 24 : 32;
ibuf = IMB_allocImBuf(width, height, ib_depth, 0);
if (ibuf) {
ibuf->ftype = TIF;
}
else {
fprintf(stderr,
"imb_loadtiff: could not allocate memory for TIFF "
"image.\n");
TIFFClose(image);
return NULL;
}
/* get alpha mode from file header */
if (flags & IB_alphamode_detect) {
if (spp == 4) {
unsigned short extra, *extraSampleTypes;
TIFFGetField(image, TIFFTAG_EXTRASAMPLES, &extra, &extraSampleTypes);
if (extraSampleTypes[0] == EXTRASAMPLE_ASSOCALPHA)
ibuf->flags |= IB_alphamode_premul;
}
}
/* if testing, we're done */
if (flags & IB_test) {
TIFFClose(image);
return ibuf;
}
/* detect if we are reading a tiled/mipmapped texture, in that case
* we don't read pixels but leave it to the cache to load tiles */
if (flags & IB_tilecache) {
format = NULL;
TIFFGetField(image, TIFFTAG_PIXAR_TEXTUREFORMAT, &format);
if (format && strcmp(format, "Plain Texture") == 0 && TIFFIsTiled(image)) {
int numlevel = TIFFNumberOfDirectories(image);
/* create empty mipmap levels in advance */
for (level = 0; level < numlevel; level++) {
if (!TIFFSetDirectory(image, level))
break;
if (level > 0) {
width = (width > 1) ? width / 2 : 1;
height = (height > 1) ? height / 2 : 1;
hbuf = IMB_allocImBuf(width, height, 32, 0);
hbuf->miplevel = level;
hbuf->ftype = ibuf->ftype;
ibuf->mipmap[level - 1] = hbuf;
}
else
hbuf = ibuf;
hbuf->flags |= IB_tilecache;
TIFFGetField(image, TIFFTAG_TILEWIDTH, &hbuf->tilex);
TIFFGetField(image, TIFFTAG_TILELENGTH, &hbuf->tiley);
hbuf->xtiles = ceil(hbuf->x / (float)hbuf->tilex);
hbuf->ytiles = ceil(hbuf->y / (float)hbuf->tiley);
imb_addtilesImBuf(hbuf);
ibuf->miptot++;
}
}
}
/* read pixels */
if (!(ibuf->flags & IB_tilecache) && !imb_read_tiff_pixels(ibuf, image)) {
fprintf(stderr, "imb_loadtiff: Failed to read tiff image.\n");
TIFFClose(image);
return NULL;
}
/* close the client layer interface to the in-memory file */
TIFFClose(image);
/* return successfully */
return ibuf;
}