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- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_getimage.c,v 1.20 93/08/25 09:28:15 sam Exp $";
- #endif
-
- /*
- * Copyright (c) 1991, 1992 Sam Leffler
- * Copyright (c) 1991, 1992 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
- /*
- * TIFF Library
- *
- * Read and return a packed RGBA image.
- */
- #include "tiffiop.h"
-
- typedef u_char RGBvalue;
-
- static u_short bitspersample;
- static u_short samplesperpixel;
- static u_short photometric;
- static u_short orientation;
- static u_short extrasamples;
- static u_short planarconfig;
- /* colormap for pallete images */
- static u_short *redcmap, *greencmap, *bluecmap;
- static int stoponerr; /* stop on read error */
- /* YCbCr support */
- static u_short YCbCrHorizSampling;
- static u_short YCbCrVertSampling;
- static float *YCbCrCoeffs;
- static float *refBlackWhite;
-
- static u_long **BWmap;
- static u_long **PALmap;
-
- static int gt(TIFF*, int, int, u_long*);
- static int gtTileContig(TIFF*, u_long*, RGBvalue*, u_long, u_long);
- static int gtTileSeparate(TIFF*, u_long*, RGBvalue*, u_long, u_long);
- static int gtStripContig(TIFF*, u_long*, RGBvalue*, u_long, u_long);
- static int gtStripSeparate(TIFF*, u_long*, RGBvalue*, u_long, u_long);
- static int makebwmap(TIFF*, RGBvalue*);
- static int makecmap(TIFF*, u_short*, u_short*, u_short*);
- static void initYCbCrConversion(void);
-
- int
- TIFFReadRGBAImage(TIFF* tif,
- u_long rwidth, u_long rheight, u_long* raster, int stop)
- {
- int ok, alpha;
- u_long width, height;
- u_short *sampleinfo;
-
- TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &bitspersample);
- switch (bitspersample) {
- case 1: case 2: case 4:
- case 8: case 16:
- break;
- default:
- TIFFError(TIFFFileName(tif),
- "Sorry, can not handle %d-bit images", bitspersample);
- return (0);
- }
- TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);
- if (samplesperpixel > 4) {
- TIFFError(TIFFFileName(tif),
- "Sorry, can not handle images with %d-samples/pixel",
- samplesperpixel);
- return (0);
- }
- TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
- &extrasamples, &sampleinfo);
- alpha = (extrasamples == 1 && sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
- TIFFGetFieldDefaulted(tif, TIFFTAG_PLANARCONFIG, &planarconfig);
- switch (samplesperpixel - extrasamples) {
- case 3:
- break;
- case 1: case 4:
- /* XXX */
- if (!alpha || planarconfig != PLANARCONFIG_CONTIG)
- break;
- /* fall thru... */
- default:
- TIFFError(TIFFFileName(tif),
- "Sorry, can not handle %d-channel %s images%s",
- samplesperpixel,
- planarconfig == PLANARCONFIG_CONTIG ?
- "packed" : "separated",
- alpha ? " with alpha" : "");
- return (0);
- }
- if (!TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric)) {
- switch (samplesperpixel) {
- case 1:
- photometric = PHOTOMETRIC_MINISBLACK;
- break;
- case 3: case 4:
- photometric = PHOTOMETRIC_RGB;
- break;
- default:
- TIFFError(TIFFFileName(tif),
- "Missing needed \"PhotometricInterpretation\" tag");
- return (0);
- }
- TIFFError(TIFFFileName(tif),
- "No \"PhotometricInterpretation\" tag, assuming %s\n",
- photometric == PHOTOMETRIC_RGB ? "RGB" : "min-is-black");
- }
- switch (photometric) {
- case PHOTOMETRIC_MINISWHITE:
- case PHOTOMETRIC_MINISBLACK:
- case PHOTOMETRIC_RGB:
- case PHOTOMETRIC_PALETTE:
- case PHOTOMETRIC_YCBCR:
- break;
- case PHOTOMETRIC_SEPARATED: {
- u_short inkset;
- TIFFGetFieldDefaulted(tif, TIFFTAG_INKSET, &inkset);
- if (inkset != INKSET_CMYK) {
- TIFFError(TIFFFileName(tif),
- "Sorry, can not handle separated image with %s=%d",
- "InkSet", inkset);
- return (0);
- }
- break;
- }
- default:
- TIFFError(TIFFFileName(tif),
- "Sorry, can not handle image with %s=%d",
- "PhotometricInterpretation", photometric);
- return (0);
- }
- TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
- TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);
- /* XXX verify rwidth and rheight against width and height */
- stoponerr = stop;
- BWmap = NULL;
- PALmap = NULL;
- ok = gt(tif, rwidth, height, raster + (rheight-height)*rwidth);
- if (BWmap)
- _TIFFfree((char *)BWmap);
- if (PALmap)
- _TIFFfree((char *)PALmap);
- return (ok);
- }
-
- static int
- checkcmap(int n, u_short* r, u_short* g, u_short* b)
- {
- while (n-- > 0)
- if (*r++ >= 256 || *g++ >= 256 || *b++ >= 256)
- return (16);
- return (8);
- }
-
- /*
- * Construct a mapping table to convert from the range
- * of the data samples to [0,255] --for display. This
- * process also handles inverting B&W images when needed.
- */
- static int
- setupMap(TIFF* tif,
- u_short minsamplevalue, u_short maxsamplevalue, RGBvalue** pMap)
- {
- register int x, range;
- RGBvalue *Map;
-
- range = maxsamplevalue - minsamplevalue;
- Map = (RGBvalue *)_TIFFmalloc((range + 1) * sizeof (RGBvalue));
- if (Map == NULL) {
- TIFFError(TIFFFileName(tif),
- "No space for photometric conversion table");
- return (0);
- }
- if (photometric == PHOTOMETRIC_MINISWHITE) {
- for (x = 0; x <= range; x++)
- Map[x] = ((range - x) * 255) / range;
- } else {
- for (x = 0; x <= range; x++)
- Map[x] = (x * 255) / range;
- }
- if (bitspersample <= 8 &&
- (photometric == PHOTOMETRIC_MINISBLACK ||
- photometric == PHOTOMETRIC_MINISWHITE)) {
- /*
- * Use photometric mapping table to construct
- * unpacking tables for samples <= 8 bits.
- */
- if (!makebwmap(tif, Map))
- return (0);
- /* no longer need Map, free it */
- _TIFFfree((char *)Map);
- Map = NULL;
- }
- *pMap = Map;
- return (1);
- }
-
- static int
- gt(TIFF* tif, int w, int h, u_long* raster)
- {
- u_short minsamplevalue, maxsamplevalue;
- RGBvalue *Map;
- int e, ncomps;
-
- TIFFGetFieldDefaulted(tif, TIFFTAG_MINSAMPLEVALUE, &minsamplevalue);
- TIFFGetFieldDefaulted(tif, TIFFTAG_MAXSAMPLEVALUE, &maxsamplevalue);
- Map = NULL;
- switch (photometric) {
- case PHOTOMETRIC_YCBCR:
- TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRCOEFFICIENTS,
- &YCbCrCoeffs);
- TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING,
- &YCbCrHorizSampling, &YCbCrVertSampling);
- TIFFGetFieldDefaulted(tif, TIFFTAG_REFERENCEBLACKWHITE,
- &refBlackWhite);
- initYCbCrConversion();
- /* fall thru... */
- case PHOTOMETRIC_RGB:
- case PHOTOMETRIC_SEPARATED:
- if (minsamplevalue == 0 && maxsamplevalue == 255)
- break;
- /* fall thru... */
- case PHOTOMETRIC_MINISBLACK:
- case PHOTOMETRIC_MINISWHITE:
- if (!setupMap(tif, minsamplevalue, maxsamplevalue, &Map))
- return (0);
- break;
- case PHOTOMETRIC_PALETTE:
- if (!TIFFGetField(tif, TIFFTAG_COLORMAP,
- &redcmap, &greencmap, &bluecmap)) {
- TIFFError(TIFFFileName(tif),
- "Missing required \"Colormap\" tag");
- return (0);
- }
- /*
- * Convert 16-bit colormap to 8-bit (unless it looks
- * like an old-style 8-bit colormap).
- */
- if (checkcmap(1<<bitspersample, redcmap, greencmap, bluecmap) == 16) {
- int i;
- for (i = (1<<bitspersample)-1; i > 0; i--) {
- #define CVT(x) (((x) * 255) / ((1L<<16)-1))
- redcmap[i] = CVT(redcmap[i]);
- greencmap[i] = CVT(greencmap[i]);
- bluecmap[i] = CVT(bluecmap[i]);
- }
- } else
- TIFFWarning(TIFFFileName(tif), "Assuming 8-bit colormap");
- if (bitspersample <= 8) {
- /*
- * Use mapping table and colormap to construct
- * unpacking tables for samples < 8 bits.
- */
- if (!makecmap(tif, redcmap, greencmap, bluecmap))
- return (0);
- }
- break;
- }
- ncomps = samplesperpixel - extrasamples;
- if (planarconfig == PLANARCONFIG_SEPARATE && ncomps > 1) {
- e = TIFFIsTiled(tif) ?
- gtTileSeparate(tif, raster, Map, h, w) :
- gtStripSeparate(tif, raster, Map, h, w);
- } else {
- e = TIFFIsTiled(tif) ?
- gtTileContig(tif, raster, Map, h, w) :
- gtStripContig(tif, raster, Map, h, w);
- }
- if (Map)
- _TIFFfree((char *)Map);
- return (e);
- }
-
- static u_long
- setorientation(TIFF* tif, u_long h)
- {
- u_long y;
-
- TIFFGetFieldDefaulted(tif, TIFFTAG_ORIENTATION, &orientation);
- switch (orientation) {
- case ORIENTATION_BOTRIGHT:
- case ORIENTATION_RIGHTBOT: /* XXX */
- case ORIENTATION_LEFTBOT: /* XXX */
- TIFFWarning(TIFFFileName(tif), "using bottom-left orientation");
- orientation = ORIENTATION_BOTLEFT;
- /* fall thru... */
- case ORIENTATION_BOTLEFT:
- y = 0;
- break;
- case ORIENTATION_TOPRIGHT:
- case ORIENTATION_RIGHTTOP: /* XXX */
- case ORIENTATION_LEFTTOP: /* XXX */
- default:
- TIFFWarning(TIFFFileName(tif), "using top-left orientation");
- orientation = ORIENTATION_TOPLEFT;
- /* fall thru... */
- case ORIENTATION_TOPLEFT:
- y = h-1;
- break;
- }
- return (y);
- }
-
- typedef void (*tileContigRoutine)
- (u_long*, u_char*, RGBvalue*, u_long, u_long, int, int);
- static tileContigRoutine pickTileContigCase(TIFF*, RGBvalue*);
-
- /*
- * Get an tile-organized image that has
- * PlanarConfiguration contiguous if SamplesPerPixel > 1
- * or
- * SamplesPerPixel == 1
- */
- static int
- gtTileContig(TIFF* tif, u_long* raster, RGBvalue* Map, u_long h, u_long w)
- {
- u_long col, row, y;
- u_long tw, th;
- u_char *buf;
- int fromskew, toskew;
- u_int nrow;
- tileContigRoutine put;
-
- put = pickTileContigCase(tif, Map);
- if (put == 0)
- return (0);
- buf = (u_char *)_TIFFmalloc(TIFFTileSize(tif));
- if (buf == 0) {
- TIFFError(TIFFFileName(tif), "No space for tile buffer");
- return (0);
- }
- TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tw);
- TIFFGetField(tif, TIFFTAG_TILELENGTH, &th);
- y = setorientation(tif, h);
- toskew = (orientation == ORIENTATION_TOPLEFT ? -tw + -w : -tw + w);
- for (row = 0; row < h; row += th) {
- nrow = (row + th > h ? h - row : th);
- for (col = 0; col < w; col += tw) {
- if (TIFFReadTile(tif, buf, col, row, 0, 0) < 0 &&
- stoponerr)
- break;
- if (col + tw > w) {
- /*
- * Tile is clipped horizontally. Calculate
- * visible portion and skewing factors.
- */
- u_long npix = w - col;
- fromskew = tw - npix;
- (*put)(raster + y*w + col, buf, Map,
- npix, nrow, fromskew, toskew + fromskew);
- } else
- (*put)(raster + y*w + col, buf, Map,
- tw, nrow, 0, toskew);
- }
- y += (orientation == ORIENTATION_TOPLEFT ? -nrow : nrow);
- }
- _TIFFfree(buf);
- return (1);
- }
-
- typedef void (*tileSeparateRoutine)
- (u_long*, u_char*, u_char*, u_char*, RGBvalue*, u_long, u_long, int, int);
- static tileSeparateRoutine pickTileSeparateCase(TIFF*, RGBvalue*);
-
- /*
- * Get an tile-organized image that has
- * SamplesPerPixel > 1
- * PlanarConfiguration separated
- * We assume that all such images are RGB.
- */
- static int
- gtTileSeparate(TIFF* tif, u_long* raster, RGBvalue* Map, u_long h, u_long w)
- {
- u_long col, row, y;
- u_long tw, th;
- u_char *buf;
- u_char *r, *g, *b;
- u_long tilesize;
- int fromskew, toskew;
- u_int nrow;
- tileSeparateRoutine put;
-
- put = pickTileSeparateCase(tif, Map);
- if (put == 0)
- return (0);
- tilesize = TIFFTileSize(tif);
- buf = (u_char *)_TIFFmalloc(3*tilesize);
- if (buf == 0) {
- TIFFError(TIFFFileName(tif), "No space for tile buffer");
- return (0);
- }
- r = buf;
- g = r + tilesize;
- b = g + tilesize;
- TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tw);
- TIFFGetField(tif, TIFFTAG_TILELENGTH, &th);
- y = setorientation(tif, h);
- toskew = (orientation == ORIENTATION_TOPLEFT ? -tw + -w : -tw + w);
- for (row = 0; row < h; row += th) {
- nrow = (row + th > h ? h - row : th);
- for (col = 0; col < w; col += tw) {
- if (TIFFReadTile(tif, r, col, row,0,0) < 0 && stoponerr)
- break;
- if (TIFFReadTile(tif, g, col, row,0,1) < 0 && stoponerr)
- break;
- if (TIFFReadTile(tif, b, col, row,0,2) < 0 && stoponerr)
- break;
- if (col + tw > w) {
- /*
- * Tile is clipped horizontally. Calculate
- * visible portion and skewing factors.
- */
- u_long npix = w - col;
- fromskew = tw - npix;
- (*put)(raster + y*w + col, r, g, b, Map,
- npix, nrow, fromskew, toskew + fromskew);
- } else
- (*put)(raster + y*w + col, r, g, b, Map,
- tw, nrow, 0, toskew);
- }
- y += (orientation == ORIENTATION_TOPLEFT ? -nrow : nrow);
- }
- _TIFFfree(buf);
- return (1);
- }
-
- /*
- * Get a strip-organized image that has
- * PlanarConfiguration contiguous if SamplesPerPixel > 1
- * or
- * SamplesPerPixel == 1
- */
- static int
- gtStripContig(TIFF* tif, u_long* raster, RGBvalue* Map, u_long h, u_long w)
- {
- u_long row, y, nrow;
- u_char *buf;
- tileContigRoutine put;
- u_long rowsperstrip;
- u_long imagewidth;
- u_long scanline;
- int fromskew, toskew;
-
- put = pickTileContigCase(tif, Map);
- if (put == 0)
- return (0);
- buf = (u_char *)_TIFFmalloc(TIFFStripSize(tif));
- if (buf == 0) {
- TIFFError(TIFFFileName(tif), "No space for strip buffer");
- return (0);
- }
- y = setorientation(tif, h);
- toskew = (orientation == ORIENTATION_TOPLEFT ? -w + -w : -w + w);
- TIFFGetFieldDefaulted(tif, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
- TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imagewidth);
- scanline = TIFFScanlineSize(tif);
- fromskew = (w < imagewidth ? imagewidth - w : 0);
- for (row = 0; row < h; row += rowsperstrip) {
- nrow = (row + rowsperstrip > h ? h - row : rowsperstrip);
- if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, row, 0),
- buf, nrow*scanline) < 0 && stoponerr)
- break;
- (*put)(raster + y*w, buf, Map, w, nrow, fromskew, toskew);
- y += (orientation == ORIENTATION_TOPLEFT ? -nrow : nrow);
- }
- _TIFFfree(buf);
- return (1);
- }
-
- /*
- * Get a strip-organized image with
- * SamplesPerPixel > 1
- * PlanarConfiguration separated
- * We assume that all such images are RGB.
- */
- static int
- gtStripSeparate(TIFF* tif, u_long* raster, RGBvalue* Map, u_long h, u_long w)
- {
- u_char *buf;
- u_char *r, *g, *b;
- u_long row, y, nrow;
- u_long scanline;
- tileSeparateRoutine put;
- u_long rowsperstrip;
- u_long imagewidth;
- u_long stripsize;
- int fromskew, toskew;
-
- stripsize = TIFFStripSize(tif);
- r = buf = (u_char *)_TIFFmalloc(3*stripsize);
- if (buf == 0)
- return (0);
- g = r + stripsize;
- b = g + stripsize;
- put = pickTileSeparateCase(tif, Map);
- if (put == 0) {
- TIFFError(TIFFFileName(tif), "Can not handle format");
- return (0);
- }
- y = setorientation(tif, h);
- toskew = (orientation == ORIENTATION_TOPLEFT ? -w + -w : -w + w);
- TIFFGetFieldDefaulted(tif, TIFFTAG_ROWSPERSTRIP, &rowsperstrip);
- TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imagewidth);
- scanline = TIFFScanlineSize(tif);
- fromskew = (w < imagewidth ? imagewidth - w : 0);
- for (row = 0; row < h; row += rowsperstrip) {
- nrow = (row + rowsperstrip > h ? h - row : rowsperstrip);
- if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, row, 0),
- r, nrow*scanline) < 0 && stoponerr)
- break;
- if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, row, 1),
- g, nrow*scanline) < 0 && stoponerr)
- break;
- if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, row, 2),
- b, nrow*scanline) < 0 && stoponerr)
- break;
- (*put)(raster + y*w, r, g, b, Map, w, nrow, fromskew, toskew);
- y += (orientation == ORIENTATION_TOPLEFT ? -nrow : nrow);
- }
- _TIFFfree(buf);
- return (1);
- }
-
- #define PACK(r,g,b) ((u_long)(r)|((u_long)(g)<<8)|((u_long)(b)<<16))
-
- /*
- * Greyscale images with less than 8 bits/sample are handled
- * with a table to avoid lots of shifts and masks. The table
- * is setup so that put*bwtile (below) can retrieve 8/bitspersample
- * pixel values simply by indexing into the table with one
- * number.
- */
- static int
- makebwmap(TIFF* tif, RGBvalue* Map)
- {
- register int i;
- int nsamples = 8 / bitspersample;
- register u_long *p;
-
- BWmap = (u_long **)_TIFFmalloc(
- 256*sizeof (u_long *)+(256*nsamples*sizeof(u_long)));
- if (BWmap == NULL) {
- TIFFError(TIFFFileName(tif), "No space for B&W mapping table");
- return (0);
- }
- p = (u_long *)(BWmap + 256);
- for (i = 0; i < 256; i++) {
- BWmap[i] = p;
- switch (bitspersample) {
- register RGBvalue c;
- #define GREY(x) c = Map[x]; *p++ = PACK(c,c,c);
- case 1:
- GREY(i>>7);
- GREY((i>>6)&1);
- GREY((i>>5)&1);
- GREY((i>>4)&1);
- GREY((i>>3)&1);
- GREY((i>>2)&1);
- GREY((i>>1)&1);
- GREY(i&1);
- break;
- case 2:
- GREY(i>>6);
- GREY((i>>4)&3);
- GREY((i>>2)&3);
- GREY(i&3);
- break;
- case 4:
- GREY(i>>4);
- GREY(i&0xf);
- break;
- case 8:
- GREY(i);
- break;
- }
- #undef GREY
- }
- return (1);
- }
-
- /*
- * Palette images with <= 8 bits/sample are handled
- * with a table to avoid lots of shifts and masks. The table
- * is setup so that put*cmaptile (below) can retrieve 8/bitspersample
- * pixel values simply by indexing into the table with one
- * number.
- */
- static int
- makecmap(TIFF* tif, u_short* rmap, u_short* gmap, u_short* bmap)
- {
- register int i;
- int nsamples = 8 / bitspersample;
- register u_long *p;
-
- PALmap = (u_long **)_TIFFmalloc(
- 256*sizeof (u_long *)+(256*nsamples*sizeof(u_long)));
- if (PALmap == NULL) {
- TIFFError(TIFFFileName(tif), "No space for Palette mapping table");
- return (0);
- }
- p = (u_long *)(PALmap + 256);
- for (i = 0; i < 256; i++) {
- PALmap[i] = p;
- #define CMAP(x) \
- c = x; *p++ = PACK(rmap[c]&0xff, gmap[c]&0xff, bmap[c]&0xff);
- switch (bitspersample) {
- register RGBvalue c;
- case 1:
- CMAP(i>>7);
- CMAP((i>>6)&1);
- CMAP((i>>5)&1);
- CMAP((i>>4)&1);
- CMAP((i>>3)&1);
- CMAP((i>>2)&1);
- CMAP((i>>1)&1);
- CMAP(i&1);
- break;
- case 2:
- CMAP(i>>6);
- CMAP((i>>4)&3);
- CMAP((i>>2)&3);
- CMAP(i&3);
- break;
- case 4:
- CMAP(i>>4);
- CMAP(i&0xf);
- break;
- case 8:
- CMAP(i);
- break;
- }
- #undef CMAP
- }
- return (1);
- }
-
- /*
- * The following routines move decoded data returned
- * from the TIFF library into rasters filled with packed
- * ABGR pixels (i.e. suitable for passing to lrecwrite.)
- *
- * The routines have been created according to the most
- * important cases and optimized. pickTileContigCase and
- * pickTileSeparateCase analyze the parameters and select
- * the appropriate "put" routine to use.
- */
- #define REPEAT8(op) REPEAT4(op); REPEAT4(op)
- #define REPEAT4(op) REPEAT2(op); REPEAT2(op)
- #define REPEAT2(op) op; op
- #define CASE8(x,op) \
- switch (x) { \
- case 7: op; case 6: op; case 5: op; \
- case 4: op; case 3: op; case 2: op; \
- case 1: op; \
- }
- #define CASE4(x,op) switch (x) { case 3: op; case 2: op; case 1: op; }
-
- #define UNROLL8(w, op1, op2) { \
- register u_long x; \
- for (x = w; x >= 8; x -= 8) { \
- op1; \
- REPEAT8(op2); \
- } \
- if (x > 0) { \
- op1; \
- CASE8(x,op2); \
- } \
- }
- #define UNROLL4(w, op1, op2) { \
- register u_long x; \
- for (x = w; x >= 4; x -= 4) { \
- op1; \
- REPEAT4(op2); \
- } \
- if (x > 0) { \
- op1; \
- CASE4(x,op2); \
- } \
- }
- #define UNROLL2(w, op1, op2) { \
- register u_long x; \
- for (x = w; x >= 2; x -= 2) { \
- op1; \
- REPEAT2(op2); \
- } \
- if (x) { \
- op1; \
- op2; \
- } \
- }
-
-
- #define SKEW(r,g,b,skew) { r += skew; g += skew; b += skew; }
-
- #define DECLAREContigPutFunc(name) \
- static void name(\
- u_long* cp, \
- u_char* pp, \
- RGBvalue* Map, \
- u_long w, u_long h, \
- int fromskew, int toskew \
- )
-
- /*
- * 8-bit palette => colormap/RGB
- */
- DECLAREContigPutFunc(put8bitcmaptile)
- {
- while (h-- > 0) {
- UNROLL8(w, NULL, *cp++ = PALmap[*pp++][0]);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 4-bit palette => colormap/RGB
- */
- DECLAREContigPutFunc(put4bitcmaptile)
- {
- register u_long *bw;
-
- fromskew /= 2;
- while (h-- > 0) {
- UNROLL2(w, bw = PALmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 2-bit palette => colormap/RGB
- */
- DECLAREContigPutFunc(put2bitcmaptile)
- {
- register u_long *bw;
-
- fromskew /= 4;
- while (h-- > 0) {
- UNROLL4(w, bw = PALmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 1-bit palette => colormap/RGB
- */
- DECLAREContigPutFunc(put1bitcmaptile)
- {
- register u_long *bw;
-
- fromskew /= 8;
- while (h-- > 0) {
- UNROLL8(w, bw = PALmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 8-bit greyscale => colormap/RGB
- */
- DECLAREContigPutFunc(putgreytile)
- {
- while (h-- > 0) {
- register u_long x;
- for (x = w; x-- > 0;)
- *cp++ = BWmap[*pp++][0];
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 1-bit bilevel => colormap/RGB
- */
- DECLAREContigPutFunc(put1bitbwtile)
- {
- register u_long *bw;
-
- fromskew /= 8;
- while (h-- > 0) {
- UNROLL8(w, bw = BWmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 2-bit greyscale => colormap/RGB
- */
- DECLAREContigPutFunc(put2bitbwtile)
- {
- register u_long *bw;
-
- fromskew /= 4;
- while (h-- > 0) {
- UNROLL4(w, bw = BWmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 4-bit greyscale => colormap/RGB
- */
- DECLAREContigPutFunc(put4bitbwtile)
- {
- register u_long *bw;
-
- fromskew /= 2;
- while (h-- > 0) {
- UNROLL2(w, bw = BWmap[*pp++], *cp++ = *bw++);
- cp += toskew;
- pp += fromskew;
- }
- }
-
- /*
- * 8-bit packed samples => RGB
- */
- DECLAREContigPutFunc(putRGBcontig8bittile)
- {
- fromskew *= samplesperpixel;
- if (Map) {
- while (h-- > 0) {
- register u_long x;
- for (x = w; x-- > 0;) {
- *cp++ = PACK(Map[pp[0]], Map[pp[1]], Map[pp[2]]);
- pp += samplesperpixel;
- }
- pp += fromskew;
- cp += toskew;
- }
- } else {
- while (h-- > 0) {
- UNROLL8(w, NULL,
- *cp++ = PACK(pp[0], pp[1], pp[2]);
- pp += samplesperpixel);
- cp += toskew;
- pp += fromskew;
- }
- }
- }
-
- /*
- * 16-bit packed samples => RGB
- */
- DECLAREContigPutFunc(putRGBcontig16bittile)
- {
- register u_short *wp = (u_short *)pp;
- register u_int x;
-
- fromskew *= samplesperpixel;
- if (Map) {
- while (h-- > 0) {
- for (x = w; x-- > 0;) {
- *cp++ = PACK(Map[wp[0]], Map[wp[1]], Map[wp[2]]);
- wp += samplesperpixel;
- }
- cp += toskew;
- wp += fromskew;
- }
- } else {
- while (h-- > 0) {
- for (x = w; x-- > 0;) {
- *cp++ = PACK(wp[0], wp[1], wp[2]);
- wp += samplesperpixel;
- }
- cp += toskew;
- wp += fromskew;
- }
- }
- }
-
- /*
- * 8-bit packed CMYK samples => RGB
- *
- * NB: The conversion of CMYK->RGB is *very* crude.
- */
- DECLAREContigPutFunc(putRGBcontig8bitCMYKtile)
- {
- u_short r, g, b, k;
-
- fromskew *= samplesperpixel;
- if (Map) {
- while (h-- > 0) {
- register u_long x;
- for (x = w; x-- > 0;) {
- k = 255 - pp[3];
- r = (k*(255-pp[0]))/255;
- g = (k*(255-pp[1]))/255;
- b = (k*(255-pp[2]))/255;
- *cp++ = PACK(Map[r], Map[g], Map[b]);
- pp += samplesperpixel;
- }
- pp += fromskew;
- cp += toskew;
- }
- } else {
- while (h-- > 0) {
- UNROLL8(w, NULL,
- k = 255 - pp[3];
- r = (k*(255-pp[0]))/255;
- g = (k*(255-pp[1]))/255;
- b = (k*(255-pp[2]))/255;
- *cp++ = PACK(r, g, b);
- pp += samplesperpixel);
- cp += toskew;
- pp += fromskew;
- }
- }
- }
-
- #define DECLARESepPutFunc(name) \
- static void name(\
- u_long* cp, \
- u_char* r, u_char* g, u_char* b, \
- RGBvalue* Map, \
- u_long w, u_long h, \
- int fromskew, int toskew \
- )
-
- /*
- * 8-bit unpacked samples => RGB
- */
- DECLARESepPutFunc(putRGBseparate8bittile)
- {
- if (Map) {
- while (h-- > 0) {
- register u_long x;
- for (x = w; x > 0; x--)
- *cp++ = PACK(Map[*r++], Map[*g++], Map[*b++]);
- SKEW(r, g, b, fromskew);
- cp += toskew;
- }
- } else {
- while (h-- > 0) {
- UNROLL8(w, NULL, *cp++ = PACK(*r++, *g++, *b++));
- SKEW(r, g, b, fromskew);
- cp += toskew;
- }
- }
- }
-
- /*
- * 16-bit unpacked samples => RGB
- */
- DECLARESepPutFunc(putRGBseparate16bittile)
- {
- register u_short *wr = (u_short *)r;
- register u_short *wg = (u_short *)g;
- register u_short *wb = (u_short *)b;
- register u_long x;
-
- if (Map) {
- while (h-- > 0) {
- for (x = w; x > 0; x--)
- *cp++ = PACK(Map[*wr++],Map[*wg++],Map[*wb++]);
- SKEW(wr, wg, wb, fromskew);
- cp += toskew;
- }
- } else {
- while (h-- > 0) {
- for (x = 0; x < w; x++)
- *cp++ = PACK(*wr++, *wg++, *wb++);
- SKEW(wr, wg, wb, fromskew);
- cp += toskew;
- }
- }
- }
-
- #define Code2V(c, RB, RW, CR) ((((c)-RB)*(float)CR)/(float)(RW-RB))
- #define CLAMP(f,min,max) \
- (int)((f)+.5 < (min) ? (min) : (f)+.5 > (max) ? (max) : (f)+.5)
-
- #define LumaRed YCbCrCoeffs[0]
- #define LumaGreen YCbCrCoeffs[1]
- #define LumaBlue YCbCrCoeffs[2]
-
- static float D1, D2;
- static float D3, D4;
-
- static void
- initYCbCrConversion(void)
- {
- D1 = 2 - 2*LumaRed;
- D2 = D1*LumaRed / LumaGreen;
- D3 = 2 - 2*LumaBlue;
- D4 = D3*LumaBlue / LumaGreen;
- }
-
- static void
- putRGBContigYCbCrClump(
- register u_long* cp, register u_char* pp,
- int cw, int ch,
- u_long w,
- int n, int fromskew, int toskew
- )
- {
- float Cb, Cr;
- int j, k;
-
- Cb = Code2V(pp[n], refBlackWhite[2], refBlackWhite[3], 127);
- Cr = Code2V(pp[n+1], refBlackWhite[4], refBlackWhite[5], 127);
- for (j = 0; j < ch; j++) {
- for (k = 0; k < cw; k++) {
- float Y, R, G, B;
- Y = Code2V(*pp++,
- refBlackWhite[0], refBlackWhite[1], 255);
- R = Y + Cr*D1;
- B = Y + Cb*D3;
- G = Y - Cb*D4 - Cr*D2;
- cp[k] = PACK(CLAMP(R,0,255),
- CLAMP(G,0,255),
- CLAMP(B,0,255));
- }
- cp += w+toskew;
- pp += fromskew;
- }
- }
- #undef LumaBlue
- #undef LumaGreen
- #undef LumaRed
- #undef CLAMP
- #undef Code2V
-
- /*
- * 8-bit packed YCbCr samples => RGB
- */
- DECLAREContigPutFunc(putcontig8bitYCbCrtile)
- {
- u_int Coff = YCbCrVertSampling * YCbCrHorizSampling;
- u_long *tp;
- u_long x;
-
- /* XXX adjust fromskew */
- while (h >= YCbCrVertSampling) {
- tp = cp;
- for (x = w; x >= YCbCrHorizSampling; x -= YCbCrHorizSampling) {
- putRGBContigYCbCrClump(tp, pp,
- YCbCrHorizSampling, YCbCrVertSampling,
- w, Coff, 0, toskew);
- tp += YCbCrHorizSampling;
- pp += Coff+2;
- }
- if (x > 0) {
- putRGBContigYCbCrClump(tp, pp,
- x, YCbCrVertSampling,
- w, Coff, YCbCrHorizSampling - x, toskew);
- pp += Coff+2;
- }
- cp += YCbCrVertSampling*(w + toskew);
- pp += fromskew;
- h -= YCbCrVertSampling;
- }
- if (h > 0) {
- tp = cp;
- for (x = w; x >= YCbCrHorizSampling; x -= YCbCrHorizSampling) {
- putRGBContigYCbCrClump(tp, pp, YCbCrHorizSampling, h,
- w, Coff, 0, toskew);
- tp += YCbCrHorizSampling;
- pp += Coff+2;
- }
- if (x > 0)
- putRGBContigYCbCrClump(tp, pp, x, h,
- w, Coff, YCbCrHorizSampling - x, toskew);
- }
- }
-
- /*
- * Select the appropriate conversion routine for packed data.
- */
- static tileContigRoutine
- pickTileContigCase(TIFF* tif, RGBvalue* Map)
- {
- tileContigRoutine put = 0;
-
- switch (photometric) {
- case PHOTOMETRIC_RGB:
- if (bitspersample == 8)
- put = putRGBcontig8bittile;
- else
- put = putRGBcontig16bittile;
- break;
- case PHOTOMETRIC_SEPARATED:
- if (bitspersample == 8)
- put = putRGBcontig8bitCMYKtile;
- break;
- case PHOTOMETRIC_PALETTE:
- switch (bitspersample) {
- case 8: put = put8bitcmaptile; break;
- case 4: put = put4bitcmaptile; break;
- case 2: put = put2bitcmaptile; break;
- case 1: put = put1bitcmaptile; break;
- }
- break;
- case PHOTOMETRIC_MINISWHITE:
- case PHOTOMETRIC_MINISBLACK:
- switch (bitspersample) {
- case 8: put = putgreytile; break;
- case 4: put = put4bitbwtile; break;
- case 2: put = put2bitbwtile; break;
- case 1: put = put1bitbwtile; break;
- }
- break;
- case PHOTOMETRIC_YCBCR:
- switch (bitspersample) {
- case 8: put = putcontig8bitYCbCrtile; break;
- }
- break;
- }
- if (put == 0)
- TIFFError(TIFFFileName(tif), "Can not handle format");
- return (put);
- }
-
- /*
- * Select the appropriate conversion routine for unpacked data.
- *
- * NB: we assume that unpacked single channel data is directed
- * to the "packed routines.
- */
- static tileSeparateRoutine
- pickTileSeparateCase(TIFF* tif, RGBvalue* Map)
- {
- tileSeparateRoutine put = 0;
-
- switch (photometric) {
- case PHOTOMETRIC_RGB:
- if (bitspersample == 8)
- put = putRGBseparate8bittile;
- else
- put = putRGBseparate16bittile;
- break;
- }
- if (put == 0)
- TIFFError(TIFFFileName(tif), "Can not handle format");
- return (put);
- }
-