/*
* Get an tile-organized image that has
* SamplesPerPixel > 1
* PlanarConfiguration separated
* We assume that all such images are RGB.
*/
boolean TIFFRasterImpl::gtTileSeparate(
const RGBvalue* Map, u_long h, u_long w
) {
u_long tilesize = TIFFTileSize(tif_);
u_char* buf = new u_char[3*tilesize];
if (buf == nil) {
TIFFError(TIFFFileName(tif_), "No space for tile buffer");
return false;
}
u_char* r = buf;
u_char* g = r + tilesize;
u_char* b = g + tilesize;
tileSeparateRoutine put = pickTileSeparateCase(Map);
u_long tw;
TIFFGetField(tif_, TIFFTAG_TILEWIDTH, &tw);
u_long th;
TIFFGetField(tif_, TIFFTAG_TILELENGTH, &th);
u_long y = setorientation(h);
int toskew = (int)(orientation_ == ORIENTATION_TOPLEFT ? -tw+-w : -tw+w);
for (u_long row = 0; row < h; row += th) {
u_long nrow = (row + th > h ? h - row : th);
for (u_long col = 0; col < w; col += tw) {
if (TIFFReadTile(tif_, r, col, row, 0, 0) < 0) {
break;
}
if (TIFFReadTile(tif_, g, col, row, 0, 1) < 0) {
break;
}
if (TIFFReadTile(tif_, b, col, row, 0, 2) < 0) {
break;
}
if (col + tw > w) {
/*
* Tile is clipped horizontally. Calculate
* visible portion and skewing factors.
*/
u_long npix = w - col;
int fromskew = (int)(tw - npix);
(this->*put)(
raster_ + y*w + col, r, g, b, Map,
npix, nrow, fromskew, toskew + fromskew
);
} else
(this->*put)(
raster_ + y*w + col, r, g, b, Map,
tw, nrow, 0, toskew
);
}
y += (orientation_ == ORIENTATION_TOPLEFT ? -nrow : nrow);
}
delete buf;
return true;
}
/*
* Get a strip-organized image with
* SamplesPerPixel > 1
* PlanarConfiguration separated
* We assume that all such images are RGB.
*/
boolean TIFFRasterImpl::gtStripSeparate(
const RGBvalue* Map, u_long h, u_long w
) {
u_long stripsize = TIFFStripSize(tif_);
u_char* buf = new u_char[3*stripsize];
u_char* r = buf;
u_char* g = r + stripsize;
u_char* b = g + stripsize;
tileSeparateRoutine put = pickTileSeparateCase(Map);
u_long y = setorientation(h);
int toskew = (int)(orientation_ == ORIENTATION_TOPLEFT ? -w + -w : -w + w);
u_long rowsperstrip = (u_long) -1L;
TIFFGetField(tif_, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
u_long imagewidth;
TIFFGetField(tif_, TIFFTAG_IMAGEWIDTH, &imagewidth);
int scanline = TIFFScanlineSize(tif_);
int fromskew = (int)(w < imagewidth ? imagewidth - w : 0);
for (u_long row = 0; row < h; row += rowsperstrip) {
u_int nrow = u_int(row + rowsperstrip > h ? h - row : rowsperstrip);
if (TIFFReadEncodedStrip(
tif_, TIFFComputeStrip(tif_, row, 0), r, nrow*scanline) < 0
) {
break;
}
if (TIFFReadEncodedStrip(
tif_, TIFFComputeStrip(tif_, row, 1), g, nrow*scanline) < 0
) {
break;
}
if (TIFFReadEncodedStrip(
tif_, TIFFComputeStrip(tif_, row, 2), b, nrow*scanline) < 0
) {
break;
}
(this->*put)(raster_ + y*w, r, g, b, Map, w, nrow, fromskew, toskew);
y += (orientation_ == ORIENTATION_TOPLEFT ? -nrow : nrow);
}
delete buf;
return true;
}
int
TIFFRGBAImageBegin(TIFFRGBAImage* img, TIFF* tif, int stop, char emsg[1024])
{
uint16* sampleinfo;
uint16 extrasamples;
uint16 planarconfig;
int colorchannels;
img->tif = tif;
img->stoponerr = stop;
TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &img->bitspersample);
switch (img->bitspersample) {
case 1: case 2: case 4:
case 8: case 16:
break;
default:
sprintf(emsg, "Sorry, can not image with %d-bit samples",
img->bitspersample);
return (0);
}
img->alpha = 0;
TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &img->samplesperpixel);
TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
&extrasamples, &sampleinfo);
if (extrasamples == 1)
switch (sampleinfo[0]) {
case EXTRASAMPLE_ASSOCALPHA: /* data is pre-multiplied */
case EXTRASAMPLE_UNASSALPHA: /* data is not pre-multiplied */
img->alpha = sampleinfo[0];
break;
}
colorchannels = img->samplesperpixel - extrasamples;
TIFFGetFieldDefaulted(tif, TIFFTAG_PLANARCONFIG, &planarconfig);
if (!TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &img->photometric)) {
switch (colorchannels) {
case 1:
if (isCCITTCompression(tif))
img->photometric = PHOTOMETRIC_MINISWHITE;
else
img->photometric = PHOTOMETRIC_MINISBLACK;
break;
case 3:
img->photometric = PHOTOMETRIC_RGB;
break;
default:
sprintf(emsg, "Missing needed %s tag", photoTag);
return (0);
}
}
switch (img->photometric) {
case PHOTOMETRIC_PALETTE:
if (!TIFFGetField(tif, TIFFTAG_COLORMAP,
&img->redcmap, &img->greencmap, &img->bluecmap)) {
TIFFError(TIFFFileName(tif), "Missing required \"Colormap\" tag");
return (0);
}
/* fall thru... */
case PHOTOMETRIC_MINISWHITE:
case PHOTOMETRIC_MINISBLACK:
if (planarconfig == PLANARCONFIG_CONTIG && img->samplesperpixel != 1) {
sprintf(emsg,
"Sorry, can not handle contiguous data with %s=%d, and %s=%d",
photoTag, img->photometric,
"Samples/pixel", img->samplesperpixel);
return (0);
}
break;
case PHOTOMETRIC_YCBCR:
if (planarconfig != PLANARCONFIG_CONTIG) {
sprintf(emsg, "Sorry, can not handle YCbCr images with %s=%d",
"Planarconfiguration", planarconfig);
return (0);
}
/* It would probably be nice to have a reality check here. */
{ uint16 compress;
TIFFGetField(tif, TIFFTAG_COMPRESSION, &compress);
if (compress == COMPRESSION_JPEG && planarconfig == PLANARCONFIG_CONTIG) {
/* can rely on libjpeg to convert to RGB */
/* XXX should restore current state on exit */
TIFFSetField(tif, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB);
img->photometric = PHOTOMETRIC_RGB;
}
}
break;
case PHOTOMETRIC_RGB:
if (colorchannels < 3) {
sprintf(emsg, "Sorry, can not handle RGB image with %s=%d",
"Color channels", colorchannels);
return (0);
}
break;
case PHOTOMETRIC_SEPARATED: {
uint16 inkset;
TIFFGetFieldDefaulted(tif, TIFFTAG_INKSET, &inkset);
if (inkset != INKSET_CMYK) {
sprintf(emsg, "Sorry, can not handle separated image with %s=%d",
"InkSet", inkset);
return (0);
}
if (img->samplesperpixel != 4) {
sprintf(emsg, "Sorry, can not handle separated image with %s=%d",
"Samples/pixel", img->samplesperpixel);
return (0);
}
break;
}
default:
sprintf(emsg, "Sorry, can not handle image with %s=%d",
photoTag, img->photometric);
return (0);
}
img->Map = NULL;
img->BWmap = NULL;
img->PALmap = NULL;
img->ycbcr = NULL;
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &img->width);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &img->height);
TIFFGetFieldDefaulted(tif, TIFFTAG_ORIENTATION, &img->orientation);
img->isContig =
!(planarconfig == PLANARCONFIG_SEPARATE && colorchannels > 1);
if (img->isContig) {
img->get = TIFFIsTiled(tif) ? gtTileContig : gtStripContig;
(void) pickTileContigCase(img);
} else {
img->get = TIFFIsTiled(tif) ? gtTileSeparate : gtStripSeparate;
(void) pickTileSeparateCase(img);
}
return (1);
}
