| /* |
| * Copyright (c) 1997 Greg Ward Larson |
| * Copyright (c) 1997 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, Greg Larson 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, Greg Larson 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, GREG LARSON 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. |
| */ |
| |
| #include "tiffiop.h" |
| #ifdef LOGLUV_SUPPORT |
| |
| /* |
| * TIFF Library. |
| * LogLuv compression support for high dynamic range images. |
| * |
| * Contributed by Greg Larson. |
| * |
| * LogLuv image support uses the TIFF library to store 16 or 10-bit |
| * log luminance values with 8 bits each of u and v or a 14-bit index. |
| * |
| * The codec can take as input and produce as output 32-bit IEEE float values |
| * as well as 16-bit integer values. A 16-bit luminance is interpreted |
| * as a sign bit followed by a 15-bit integer that is converted |
| * to and from a linear magnitude using the transformation: |
| * |
| * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit |
| * |
| * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real |
| * |
| * The actual conversion to world luminance units in candelas per sq. meter |
| * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. |
| * This value is usually set such that a reasonable exposure comes from |
| * clamping decoded luminances above 1 to 1 in the displayed image. |
| * |
| * The 16-bit values for u and v may be converted to real values by dividing |
| * each by 32768. (This allows for negative values, which aren't useful as |
| * far as we know, but are left in case of future improvements in human |
| * color vision.) |
| * |
| * Conversion from (u,v), which is actually the CIE (u',v') system for |
| * you color scientists, is accomplished by the following transformation: |
| * |
| * u = 4*x / (-2*x + 12*y + 3) |
| * v = 9*y / (-2*x + 12*y + 3) |
| * |
| * x = 9*u / (6*u - 16*v + 12) |
| * y = 4*v / (6*u - 16*v + 12) |
| * |
| * This process is greatly simplified by passing 32-bit IEEE floats |
| * for each of three CIE XYZ coordinates. The codec then takes care |
| * of conversion to and from LogLuv, though the application is still |
| * responsible for interpreting the TIFFTAG_STONITS calibration factor. |
| * |
| * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white |
| * point of (x,y)=(1/3,1/3). However, most color systems assume some other |
| * white point, such as D65, and an absolute color conversion to XYZ then |
| * to another color space with a different white point may introduce an |
| * unwanted color cast to the image. It is often desirable, therefore, to |
| * perform a white point conversion that maps the input white to [1 1 1] |
| * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT |
| * tag value. A decoder that demands absolute color calibration may use |
| * this white point tag to get back the original colors, but usually it |
| * will be ignored and the new white point will be used instead that |
| * matches the output color space. |
| * |
| * Pixel information is compressed into one of two basic encodings, depending |
| * on the setting of the compression tag, which is one of COMPRESSION_SGILOG |
| * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is |
| * stored as: |
| * |
| * 1 15 |
| * |-+---------------| |
| * |
| * COMPRESSION_SGILOG color data is stored as: |
| * |
| * 1 15 8 8 |
| * |-+---------------|--------+--------| |
| * S Le ue ve |
| * |
| * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: |
| * |
| * 10 14 |
| * |----------|--------------| |
| * Le' Ce |
| * |
| * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is |
| * encoded as an index for optimal color resolution. The 10 log bits are |
| * defined by the following conversions: |
| * |
| * L = 2^((Le'+.5)/64 - 12) # real from 10-bit |
| * |
| * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real |
| * |
| * The 10 bits of the smaller format may be converted into the 15 bits of |
| * the larger format by multiplying by 4 and adding 13314. Obviously, |
| * a smaller range of magnitudes is covered (about 5 orders of magnitude |
| * instead of 38), and the lack of a sign bit means that negative luminances |
| * are not allowed. (Well, they aren't allowed in the real world, either, |
| * but they are useful for certain types of image processing.) |
| * |
| * The desired user format is controlled by the setting the internal |
| * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: |
| * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values |
| * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v |
| * Raw data i/o is also possible using: |
| * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel |
| * In addition, the following decoding is provided for ease of display: |
| * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values |
| * |
| * For grayscale images, we provide the following data formats: |
| * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values |
| * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance |
| * SGILOGDATAFMT_8BIT = 8-bit gray monitor values |
| * |
| * Note that the COMPRESSION_SGILOG applies a simple run-length encoding |
| * scheme by separating the logL, u and v bytes for each row and applying |
| * a PackBits type of compression. Since the 24-bit encoding is not |
| * adaptive, the 32-bit color format takes less space in many cases. |
| * |
| * Further control is provided over the conversion from higher-resolution |
| * formats to final encoded values through the pseudo tag |
| * TIFFTAG_SGILOGENCODE: |
| * SGILOGENCODE_NODITHER = do not dither encoded values |
| * SGILOGENCODE_RANDITHER = apply random dithering during encoding |
| * |
| * The default value of this tag is SGILOGENCODE_NODITHER for |
| * COMPRESSION_SGILOG to maximize run-length encoding and |
| * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn |
| * quantization errors into noise. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| |
| /* |
| * State block for each open TIFF |
| * file using LogLuv compression/decompression. |
| */ |
| typedef struct logLuvState LogLuvState; |
| |
| struct logLuvState { |
| int encoder_state; /* 1 if encoder correctly initialized */ |
| int user_datafmt; /* user data format */ |
| int encode_meth; /* encoding method */ |
| int pixel_size; /* bytes per pixel */ |
| |
| uint8* tbuf; /* translation buffer */ |
| tmsize_t tbuflen; /* buffer length */ |
| void (*tfunc)(LogLuvState*, uint8*, tmsize_t); |
| |
| TIFFVSetMethod vgetparent; /* super-class method */ |
| TIFFVSetMethod vsetparent; /* super-class method */ |
| }; |
| |
| #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) |
| #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) |
| |
| #define SGILOGDATAFMT_UNKNOWN -1 |
| |
| #define MINRUN 4 /* minimum run length */ |
| |
| /* |
| * Decode a string of 16-bit gray pixels. |
| */ |
| static int |
| LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) |
| { |
| static const char module[] = "LogL16Decode"; |
| LogLuvState* sp = DecoderState(tif); |
| int shft; |
| tmsize_t i; |
| tmsize_t npixels; |
| unsigned char* bp; |
| int16* tp; |
| int16 b; |
| tmsize_t cc; |
| int rc; |
| |
| (void)s; |
| assert(s == 0); |
| assert(sp != NULL); |
| |
| npixels = occ / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_16BIT) |
| tp = (int16*) op; |
| else { |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| tp = (int16*) sp->tbuf; |
| } |
| _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); |
| |
| bp = (unsigned char*) tif->tif_rawcp; |
| cc = tif->tif_rawcc; |
| /* get each byte string */ |
| for (shft = 8; shft >= 0; shft -=8) { |
| for (i = 0; i < npixels && cc > 0; ) { |
| if (*bp >= 128) { /* run */ |
| if( cc < 2 ) |
| break; |
| rc = *bp++ + (2-128); |
| b = (int16)(*bp++ << shft); |
| cc -= 2; |
| while (rc-- && i < npixels) |
| tp[i++] |= b; |
| } else { /* non-run */ |
| rc = *bp++; /* nul is noop */ |
| while (--cc && rc-- && i < npixels) |
| tp[i++] |= (int16)*bp++ << shft; |
| } |
| } |
| if (i != npixels) { |
| #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %I64d pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned __int64) (npixels - i)); |
| #else |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %llu pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned long long) (npixels - i)); |
| #endif |
| tif->tif_rawcp = (uint8*) bp; |
| tif->tif_rawcc = cc; |
| return (0); |
| } |
| } |
| (*sp->tfunc)(sp, op, npixels); |
| tif->tif_rawcp = (uint8*) bp; |
| tif->tif_rawcc = cc; |
| return (1); |
| } |
| |
| /* |
| * Decode a string of 24-bit pixels. |
| */ |
| static int |
| LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) |
| { |
| static const char module[] = "LogLuvDecode24"; |
| LogLuvState* sp = DecoderState(tif); |
| tmsize_t cc; |
| tmsize_t i; |
| tmsize_t npixels; |
| unsigned char* bp; |
| uint32* tp; |
| |
| (void)s; |
| assert(s == 0); |
| assert(sp != NULL); |
| |
| npixels = occ / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
| tp = (uint32 *)op; |
| else { |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| tp = (uint32 *) sp->tbuf; |
| } |
| /* copy to array of uint32 */ |
| bp = (unsigned char*) tif->tif_rawcp; |
| cc = tif->tif_rawcc; |
| for (i = 0; i < npixels && cc >= 3; i++) { |
| tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; |
| bp += 3; |
| cc -= 3; |
| } |
| tif->tif_rawcp = (uint8*) bp; |
| tif->tif_rawcc = cc; |
| if (i != npixels) { |
| #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %I64d pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned __int64) (npixels - i)); |
| #else |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %llu pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned long long) (npixels - i)); |
| #endif |
| return (0); |
| } |
| (*sp->tfunc)(sp, op, npixels); |
| return (1); |
| } |
| |
| /* |
| * Decode a string of 32-bit pixels. |
| */ |
| static int |
| LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) |
| { |
| static const char module[] = "LogLuvDecode32"; |
| LogLuvState* sp; |
| int shft; |
| tmsize_t i; |
| tmsize_t npixels; |
| unsigned char* bp; |
| uint32* tp; |
| uint32 b; |
| tmsize_t cc; |
| int rc; |
| |
| (void)s; |
| assert(s == 0); |
| sp = DecoderState(tif); |
| assert(sp != NULL); |
| |
| npixels = occ / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
| tp = (uint32*) op; |
| else { |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| tp = (uint32*) sp->tbuf; |
| } |
| _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); |
| |
| bp = (unsigned char*) tif->tif_rawcp; |
| cc = tif->tif_rawcc; |
| /* get each byte string */ |
| for (shft = 24; shft >= 0; shft -=8) { |
| for (i = 0; i < npixels && cc > 0; ) { |
| if (*bp >= 128) { /* run */ |
| if( cc < 2 ) |
| break; |
| rc = *bp++ + (2-128); |
| b = (uint32)*bp++ << shft; |
| cc -= 2; |
| while (rc-- && i < npixels) |
| tp[i++] |= b; |
| } else { /* non-run */ |
| rc = *bp++; /* nul is noop */ |
| while (--cc && rc-- && i < npixels) |
| tp[i++] |= (uint32)*bp++ << shft; |
| } |
| } |
| if (i != npixels) { |
| #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %I64d pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned __int64) (npixels - i)); |
| #else |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Not enough data at row %lu (short %llu pixels)", |
| (unsigned long) tif->tif_row, |
| (unsigned long long) (npixels - i)); |
| #endif |
| tif->tif_rawcp = (uint8*) bp; |
| tif->tif_rawcc = cc; |
| return (0); |
| } |
| } |
| (*sp->tfunc)(sp, op, npixels); |
| tif->tif_rawcp = (uint8*) bp; |
| tif->tif_rawcc = cc; |
| return (1); |
| } |
| |
| /* |
| * Decode a strip of pixels. We break it into rows to |
| * maintain synchrony with the encode algorithm, which |
| * is row by row. |
| */ |
| static int |
| LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| tmsize_t rowlen = TIFFScanlineSize(tif); |
| |
| if (rowlen == 0) |
| return 0; |
| |
| assert(cc%rowlen == 0); |
| while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { |
| bp += rowlen; |
| cc -= rowlen; |
| } |
| return (cc == 0); |
| } |
| |
| /* |
| * Decode a tile of pixels. We break it into rows to |
| * maintain synchrony with the encode algorithm, which |
| * is row by row. |
| */ |
| static int |
| LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| tmsize_t rowlen = TIFFTileRowSize(tif); |
| |
| if (rowlen == 0) |
| return 0; |
| |
| assert(cc%rowlen == 0); |
| while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { |
| bp += rowlen; |
| cc -= rowlen; |
| } |
| return (cc == 0); |
| } |
| |
| /* |
| * Encode a row of 16-bit pixels. |
| */ |
| static int |
| LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| static const char module[] = "LogL16Encode"; |
| LogLuvState* sp = EncoderState(tif); |
| int shft; |
| tmsize_t i; |
| tmsize_t j; |
| tmsize_t npixels; |
| uint8* op; |
| int16* tp; |
| int16 b; |
| tmsize_t occ; |
| int rc=0, mask; |
| tmsize_t beg; |
| |
| (void)s; |
| assert(s == 0); |
| assert(sp != NULL); |
| npixels = cc / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_16BIT) |
| tp = (int16*) bp; |
| else { |
| tp = (int16*) sp->tbuf; |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| (*sp->tfunc)(sp, bp, npixels); |
| } |
| /* compress each byte string */ |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| for (shft = 8; shft >= 0; shft -=8) { |
| for (i = 0; i < npixels; i += rc) { |
| if (occ < 4) { |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| if (!TIFFFlushData1(tif)) |
| return (0); |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| } |
| mask = 0xff << shft; /* find next run */ |
| for (beg = i; beg < npixels; beg += rc) { |
| b = (int16) (tp[beg] & mask); |
| rc = 1; |
| while (rc < 127+2 && beg+rc < npixels && |
| (tp[beg+rc] & mask) == b) |
| rc++; |
| if (rc >= MINRUN) |
| break; /* long enough */ |
| } |
| if (beg-i > 1 && beg-i < MINRUN) { |
| b = (int16) (tp[i] & mask);/*check short run */ |
| j = i+1; |
| while ((tp[j++] & mask) == b) |
| if (j == beg) { |
| *op++ = (uint8)(128-2+j-i); |
| *op++ = (uint8)(b >> shft); |
| occ -= 2; |
| i = beg; |
| break; |
| } |
| } |
| while (i < beg) { /* write out non-run */ |
| if ((j = beg-i) > 127) j = 127; |
| if (occ < j+3) { |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| if (!TIFFFlushData1(tif)) |
| return (0); |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| } |
| *op++ = (uint8) j; occ--; |
| while (j--) { |
| *op++ = (uint8) (tp[i++] >> shft & 0xff); |
| occ--; |
| } |
| } |
| if (rc >= MINRUN) { /* write out run */ |
| *op++ = (uint8) (128-2+rc); |
| *op++ = (uint8) (tp[beg] >> shft & 0xff); |
| occ -= 2; |
| } else |
| rc = 0; |
| } |
| } |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| |
| return (1); |
| } |
| |
| /* |
| * Encode a row of 24-bit pixels. |
| */ |
| static int |
| LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| static const char module[] = "LogLuvEncode24"; |
| LogLuvState* sp = EncoderState(tif); |
| tmsize_t i; |
| tmsize_t npixels; |
| tmsize_t occ; |
| uint8* op; |
| uint32* tp; |
| |
| (void)s; |
| assert(s == 0); |
| assert(sp != NULL); |
| npixels = cc / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
| tp = (uint32*) bp; |
| else { |
| tp = (uint32*) sp->tbuf; |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| (*sp->tfunc)(sp, bp, npixels); |
| } |
| /* write out encoded pixels */ |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| for (i = npixels; i--; ) { |
| if (occ < 3) { |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| if (!TIFFFlushData1(tif)) |
| return (0); |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| } |
| *op++ = (uint8)(*tp >> 16); |
| *op++ = (uint8)(*tp >> 8 & 0xff); |
| *op++ = (uint8)(*tp++ & 0xff); |
| occ -= 3; |
| } |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| |
| return (1); |
| } |
| |
| /* |
| * Encode a row of 32-bit pixels. |
| */ |
| static int |
| LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| static const char module[] = "LogLuvEncode32"; |
| LogLuvState* sp = EncoderState(tif); |
| int shft; |
| tmsize_t i; |
| tmsize_t j; |
| tmsize_t npixels; |
| uint8* op; |
| uint32* tp; |
| uint32 b; |
| tmsize_t occ; |
| int rc=0, mask; |
| tmsize_t beg; |
| |
| (void)s; |
| assert(s == 0); |
| assert(sp != NULL); |
| |
| npixels = cc / sp->pixel_size; |
| |
| if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
| tp = (uint32*) bp; |
| else { |
| tp = (uint32*) sp->tbuf; |
| if(sp->tbuflen < npixels) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Translation buffer too short"); |
| return (0); |
| } |
| (*sp->tfunc)(sp, bp, npixels); |
| } |
| /* compress each byte string */ |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| for (shft = 24; shft >= 0; shft -=8) { |
| for (i = 0; i < npixels; i += rc) { |
| if (occ < 4) { |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| if (!TIFFFlushData1(tif)) |
| return (0); |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| } |
| mask = 0xff << shft; /* find next run */ |
| for (beg = i; beg < npixels; beg += rc) { |
| b = tp[beg] & mask; |
| rc = 1; |
| while (rc < 127+2 && beg+rc < npixels && |
| (tp[beg+rc] & mask) == b) |
| rc++; |
| if (rc >= MINRUN) |
| break; /* long enough */ |
| } |
| if (beg-i > 1 && beg-i < MINRUN) { |
| b = tp[i] & mask; /* check short run */ |
| j = i+1; |
| while ((tp[j++] & mask) == b) |
| if (j == beg) { |
| *op++ = (uint8)(128-2+j-i); |
| *op++ = (uint8)(b >> shft); |
| occ -= 2; |
| i = beg; |
| break; |
| } |
| } |
| while (i < beg) { /* write out non-run */ |
| if ((j = beg-i) > 127) j = 127; |
| if (occ < j+3) { |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| if (!TIFFFlushData1(tif)) |
| return (0); |
| op = tif->tif_rawcp; |
| occ = tif->tif_rawdatasize - tif->tif_rawcc; |
| } |
| *op++ = (uint8) j; occ--; |
| while (j--) { |
| *op++ = (uint8)(tp[i++] >> shft & 0xff); |
| occ--; |
| } |
| } |
| if (rc >= MINRUN) { /* write out run */ |
| *op++ = (uint8) (128-2+rc); |
| *op++ = (uint8)(tp[beg] >> shft & 0xff); |
| occ -= 2; |
| } else |
| rc = 0; |
| } |
| } |
| tif->tif_rawcp = op; |
| tif->tif_rawcc = tif->tif_rawdatasize - occ; |
| |
| return (1); |
| } |
| |
| /* |
| * Encode a strip of pixels. We break it into rows to |
| * avoid encoding runs across row boundaries. |
| */ |
| static int |
| LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| tmsize_t rowlen = TIFFScanlineSize(tif); |
| |
| if (rowlen == 0) |
| return 0; |
| |
| assert(cc%rowlen == 0); |
| while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) { |
| bp += rowlen; |
| cc -= rowlen; |
| } |
| return (cc == 0); |
| } |
| |
| /* |
| * Encode a tile of pixels. We break it into rows to |
| * avoid encoding runs across row boundaries. |
| */ |
| static int |
| LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) |
| { |
| tmsize_t rowlen = TIFFTileRowSize(tif); |
| |
| if (rowlen == 0) |
| return 0; |
| |
| assert(cc%rowlen == 0); |
| while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) { |
| bp += rowlen; |
| cc -= rowlen; |
| } |
| return (cc == 0); |
| } |
| |
| /* |
| * Encode/Decode functions for converting to and from user formats. |
| */ |
| |
| #include "uvcode.h" |
| |
| #ifndef UVSCALE |
| #define U_NEU 0.210526316 |
| #define V_NEU 0.473684211 |
| #define UVSCALE 410. |
| #endif |
| |
| #ifndef M_LN2 |
| #define M_LN2 0.69314718055994530942 |
| #endif |
| #ifndef M_PI |
| #define M_PI 3.14159265358979323846 |
| #endif |
| #undef log2 /* Conflict with C'99 function */ |
| #define log2(x) ((1./M_LN2)*log(x)) |
| #undef exp2 /* Conflict with C'99 function */ |
| #define exp2(x) exp(M_LN2*(x)) |
| |
| static int tiff_itrunc(double x, int m) |
| { |
| if( m == SGILOGENCODE_NODITHER ) |
| return (int)x; |
| /* Silence CoverityScan warning about bad crypto function */ |
| /* coverity[dont_call] */ |
| return (int)(x + rand()*(1./RAND_MAX) - .5); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| double |
| LogL16toY(int p16) /* compute luminance from 16-bit LogL */ |
| { |
| int Le = p16 & 0x7fff; |
| double Y; |
| |
| if (!Le) |
| return (0.); |
| Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); |
| return (!(p16 & 0x8000) ? Y : -Y); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| int |
| LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ |
| { |
| if (Y >= 1.8371976e19) |
| return (0x7fff); |
| if (Y <= -1.8371976e19) |
| return (0xffff); |
| if (Y > 5.4136769e-20) |
| return tiff_itrunc(256.*(log2(Y) + 64.), em); |
| if (Y < -5.4136769e-20) |
| return (~0x7fff | tiff_itrunc(256.*(log2(-Y) + 64.), em)); |
| return (0); |
| } |
| |
| static void |
| L16toY(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| int16* l16 = (int16*) sp->tbuf; |
| float* yp = (float*) op; |
| |
| while (n-- > 0) |
| *yp++ = (float)LogL16toY(*l16++); |
| } |
| |
| static void |
| L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| int16* l16 = (int16*) sp->tbuf; |
| uint8* gp = (uint8*) op; |
| |
| while (n-- > 0) { |
| double Y = LogL16toY(*l16++); |
| *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); |
| } |
| } |
| |
| static void |
| L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| int16* l16 = (int16*) sp->tbuf; |
| float* yp = (float*) op; |
| |
| while (n-- > 0) |
| *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| void |
| XYZtoRGB24(float xyz[3], uint8 rgb[3]) |
| { |
| double r, g, b; |
| /* assume CCIR-709 primaries */ |
| r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; |
| g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; |
| b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; |
| /* assume 2.0 gamma for speed */ |
| /* could use integer sqrt approx., but this is probably faster */ |
| rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); |
| rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); |
| rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| double |
| LogL10toY(int p10) /* compute luminance from 10-bit LogL */ |
| { |
| if (p10 == 0) |
| return (0.); |
| return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| int |
| LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ |
| { |
| if (Y >= 15.742) |
| return (0x3ff); |
| else if (Y <= .00024283) |
| return (0); |
| else |
| return tiff_itrunc(64.*(log2(Y) + 12.), em); |
| } |
| |
| #define NANGLES 100 |
| #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ |
| * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) |
| |
| static int |
| oog_encode(double u, double v) /* encode out-of-gamut chroma */ |
| { |
| static int oog_table[NANGLES]; |
| static int initialized = 0; |
| register int i; |
| |
| if (!initialized) { /* set up perimeter table */ |
| double eps[NANGLES], ua, va, ang, epsa; |
| int ui, vi, ustep; |
| for (i = NANGLES; i--; ) |
| eps[i] = 2.; |
| for (vi = UV_NVS; vi--; ) { |
| va = UV_VSTART + (vi+.5)*UV_SQSIZ; |
| ustep = uv_row[vi].nus-1; |
| if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) |
| ustep = 1; |
| for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { |
| ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; |
| ang = uv2ang(ua, va); |
| i = (int) ang; |
| epsa = fabs(ang - (i+.5)); |
| if (epsa < eps[i]) { |
| oog_table[i] = uv_row[vi].ncum + ui; |
| eps[i] = epsa; |
| } |
| } |
| } |
| for (i = NANGLES; i--; ) /* fill any holes */ |
| if (eps[i] > 1.5) { |
| int i1, i2; |
| for (i1 = 1; i1 < NANGLES/2; i1++) |
| if (eps[(i+i1)%NANGLES] < 1.5) |
| break; |
| for (i2 = 1; i2 < NANGLES/2; i2++) |
| if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) |
| break; |
| if (i1 < i2) |
| oog_table[i] = |
| oog_table[(i+i1)%NANGLES]; |
| else |
| oog_table[i] = |
| oog_table[(i+NANGLES-i2)%NANGLES]; |
| } |
| initialized = 1; |
| } |
| i = (int) uv2ang(u, v); /* look up hue angle */ |
| return (oog_table[i]); |
| } |
| |
| #undef uv2ang |
| #undef NANGLES |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| int |
| uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ |
| { |
| register int vi, ui; |
| |
| if (v < UV_VSTART) |
| return oog_encode(u, v); |
| vi = tiff_itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); |
| if (vi >= UV_NVS) |
| return oog_encode(u, v); |
| if (u < uv_row[vi].ustart) |
| return oog_encode(u, v); |
| ui = tiff_itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); |
| if (ui >= uv_row[vi].nus) |
| return oog_encode(u, v); |
| |
| return (uv_row[vi].ncum + ui); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| int |
| uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ |
| { |
| int upper, lower; |
| register int ui, vi; |
| |
| if (c < 0 || c >= UV_NDIVS) |
| return (-1); |
| lower = 0; /* binary search */ |
| upper = UV_NVS; |
| while (upper - lower > 1) { |
| vi = (lower + upper) >> 1; |
| ui = c - uv_row[vi].ncum; |
| if (ui > 0) |
| lower = vi; |
| else if (ui < 0) |
| upper = vi; |
| else { |
| lower = vi; |
| break; |
| } |
| } |
| vi = lower; |
| ui = c - uv_row[vi].ncum; |
| *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; |
| *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; |
| return (0); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| void |
| LogLuv24toXYZ(uint32 p, float XYZ[3]) |
| { |
| int Ce; |
| double L, u, v, s, x, y; |
| /* decode luminance */ |
| L = LogL10toY(p>>14 & 0x3ff); |
| if (L <= 0.) { |
| XYZ[0] = XYZ[1] = XYZ[2] = 0.; |
| return; |
| } |
| /* decode color */ |
| Ce = p & 0x3fff; |
| if (uv_decode(&u, &v, Ce) < 0) { |
| u = U_NEU; v = V_NEU; |
| } |
| s = 1./(6.*u - 16.*v + 12.); |
| x = 9.*u * s; |
| y = 4.*v * s; |
| /* convert to XYZ */ |
| XYZ[0] = (float)(x/y * L); |
| XYZ[1] = (float)L; |
| XYZ[2] = (float)((1.-x-y)/y * L); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| uint32 |
| LogLuv24fromXYZ(float XYZ[3], int em) |
| { |
| int Le, Ce; |
| double u, v, s; |
| /* encode luminance */ |
| Le = LogL10fromY(XYZ[1], em); |
| /* encode color */ |
| s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; |
| if (!Le || s <= 0.) { |
| u = U_NEU; |
| v = V_NEU; |
| } else { |
| u = 4.*XYZ[0] / s; |
| v = 9.*XYZ[1] / s; |
| } |
| Ce = uv_encode(u, v, em); |
| if (Ce < 0) /* never happens */ |
| Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
| /* combine encodings */ |
| return (Le << 14 | Ce); |
| } |
| |
| static void |
| Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| float* xyz = (float*) op; |
| |
| while (n-- > 0) { |
| LogLuv24toXYZ(*luv, xyz); |
| xyz += 3; |
| luv++; |
| } |
| } |
| |
| static void |
| Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| int16* luv3 = (int16*) op; |
| |
| while (n-- > 0) { |
| double u, v; |
| |
| *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); |
| if (uv_decode(&u, &v, *luv&0x3fff) < 0) { |
| u = U_NEU; |
| v = V_NEU; |
| } |
| *luv3++ = (int16)(u * (1L<<15)); |
| *luv3++ = (int16)(v * (1L<<15)); |
| luv++; |
| } |
| } |
| |
| static void |
| Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| uint8* rgb = (uint8*) op; |
| |
| while (n-- > 0) { |
| float xyz[3]; |
| |
| LogLuv24toXYZ(*luv++, xyz); |
| XYZtoRGB24(xyz, rgb); |
| rgb += 3; |
| } |
| } |
| |
| static void |
| Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| float* xyz = (float*) op; |
| |
| while (n-- > 0) { |
| *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); |
| xyz += 3; |
| } |
| } |
| |
| static void |
| Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| int16* luv3 = (int16*) op; |
| |
| while (n-- > 0) { |
| int Le, Ce; |
| |
| if (luv3[0] <= 0) |
| Le = 0; |
| else if (luv3[0] >= (1<<12)+3314) |
| Le = (1<<10) - 1; |
| else if (sp->encode_meth == SGILOGENCODE_NODITHER) |
| Le = (luv3[0]-3314) >> 2; |
| else |
| Le = tiff_itrunc(.25*(luv3[0]-3314.), sp->encode_meth); |
| |
| Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), |
| sp->encode_meth); |
| if (Ce < 0) /* never happens */ |
| Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
| *luv++ = (uint32)Le << 14 | Ce; |
| luv3 += 3; |
| } |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| void |
| LogLuv32toXYZ(uint32 p, float XYZ[3]) |
| { |
| double L, u, v, s, x, y; |
| /* decode luminance */ |
| L = LogL16toY((int)p >> 16); |
| if (L <= 0.) { |
| XYZ[0] = XYZ[1] = XYZ[2] = 0.; |
| return; |
| } |
| /* decode color */ |
| u = 1./UVSCALE * ((p>>8 & 0xff) + .5); |
| v = 1./UVSCALE * ((p & 0xff) + .5); |
| s = 1./(6.*u - 16.*v + 12.); |
| x = 9.*u * s; |
| y = 4.*v * s; |
| /* convert to XYZ */ |
| XYZ[0] = (float)(x/y * L); |
| XYZ[1] = (float)L; |
| XYZ[2] = (float)((1.-x-y)/y * L); |
| } |
| |
| #if !LOGLUV_PUBLIC |
| static |
| #endif |
| uint32 |
| LogLuv32fromXYZ(float XYZ[3], int em) |
| { |
| unsigned int Le, ue, ve; |
| double u, v, s; |
| /* encode luminance */ |
| Le = (unsigned int)LogL16fromY(XYZ[1], em); |
| /* encode color */ |
| s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; |
| if (!Le || s <= 0.) { |
| u = U_NEU; |
| v = V_NEU; |
| } else { |
| u = 4.*XYZ[0] / s; |
| v = 9.*XYZ[1] / s; |
| } |
| if (u <= 0.) ue = 0; |
| else ue = tiff_itrunc(UVSCALE*u, em); |
| if (ue > 255) ue = 255; |
| if (v <= 0.) ve = 0; |
| else ve = tiff_itrunc(UVSCALE*v, em); |
| if (ve > 255) ve = 255; |
| /* combine encodings */ |
| return (Le << 16 | ue << 8 | ve); |
| } |
| |
| static void |
| Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| float* xyz = (float*) op; |
| |
| while (n-- > 0) { |
| LogLuv32toXYZ(*luv++, xyz); |
| xyz += 3; |
| } |
| } |
| |
| static void |
| Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| int16* luv3 = (int16*) op; |
| |
| while (n-- > 0) { |
| double u, v; |
| |
| *luv3++ = (int16)(*luv >> 16); |
| u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); |
| v = 1./UVSCALE * ((*luv & 0xff) + .5); |
| *luv3++ = (int16)(u * (1L<<15)); |
| *luv3++ = (int16)(v * (1L<<15)); |
| luv++; |
| } |
| } |
| |
| static void |
| Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| uint8* rgb = (uint8*) op; |
| |
| while (n-- > 0) { |
| float xyz[3]; |
| |
| LogLuv32toXYZ(*luv++, xyz); |
| XYZtoRGB24(xyz, rgb); |
| rgb += 3; |
| } |
| } |
| |
| static void |
| Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| float* xyz = (float*) op; |
| |
| while (n-- > 0) { |
| *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); |
| xyz += 3; |
| } |
| } |
| |
| static void |
| Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| uint32* luv = (uint32*) sp->tbuf; |
| int16* luv3 = (int16*) op; |
| |
| if (sp->encode_meth == SGILOGENCODE_NODITHER) { |
| while (n-- > 0) { |
| *luv++ = (uint32)luv3[0] << 16 | |
| (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | |
| (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); |
| luv3 += 3; |
| } |
| return; |
| } |
| while (n-- > 0) { |
| *luv++ = (uint32)luv3[0] << 16 | |
| (tiff_itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | |
| (tiff_itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); |
| luv3 += 3; |
| } |
| } |
| |
| static void |
| _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) |
| { |
| (void) sp; (void) op; (void) n; |
| } |
| |
| static int |
| LogL16GuessDataFmt(TIFFDirectory *td) |
| { |
| #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) |
| switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { |
| case PACK(1, 32, SAMPLEFORMAT_IEEEFP): |
| return (SGILOGDATAFMT_FLOAT); |
| case PACK(1, 16, SAMPLEFORMAT_VOID): |
| case PACK(1, 16, SAMPLEFORMAT_INT): |
| case PACK(1, 16, SAMPLEFORMAT_UINT): |
| return (SGILOGDATAFMT_16BIT); |
| case PACK(1, 8, SAMPLEFORMAT_VOID): |
| case PACK(1, 8, SAMPLEFORMAT_UINT): |
| return (SGILOGDATAFMT_8BIT); |
| } |
| #undef PACK |
| return (SGILOGDATAFMT_UNKNOWN); |
| } |
| |
| static tmsize_t |
| multiply_ms(tmsize_t m1, tmsize_t m2) |
| { |
| return _TIFFMultiplySSize(NULL, m1, m2, NULL); |
| } |
| |
| static int |
| LogL16InitState(TIFF* tif) |
| { |
| static const char module[] = "LogL16InitState"; |
| TIFFDirectory *td = &tif->tif_dir; |
| LogLuvState* sp = DecoderState(tif); |
| |
| assert(sp != NULL); |
| assert(td->td_photometric == PHOTOMETRIC_LOGL); |
| |
| if( td->td_samplesperpixel != 1 ) |
| { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Sorry, can not handle LogL image with %s=%d", |
| "Samples/pixel", td->td_samplesperpixel); |
| return 0; |
| } |
| |
| /* for some reason, we can't do this in TIFFInitLogL16 */ |
| if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) |
| sp->user_datafmt = LogL16GuessDataFmt(td); |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->pixel_size = sizeof (float); |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->pixel_size = sizeof (int16); |
| break; |
| case SGILOGDATAFMT_8BIT: |
| sp->pixel_size = sizeof (uint8); |
| break; |
| default: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "No support for converting user data format to LogL"); |
| return (0); |
| } |
| if( isTiled(tif) ) |
| sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); |
| else if( td->td_rowsperstrip < td->td_imagelength ) |
| sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); |
| else |
| sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength); |
| if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || |
| (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { |
| TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); |
| return (0); |
| } |
| return (1); |
| } |
| |
| static int |
| LogLuvGuessDataFmt(TIFFDirectory *td) |
| { |
| int guess; |
| |
| /* |
| * If the user didn't tell us their datafmt, |
| * take our best guess from the bitspersample. |
| */ |
| #define PACK(a,b) (((a)<<3)|(b)) |
| switch (PACK(td->td_bitspersample, td->td_sampleformat)) { |
| case PACK(32, SAMPLEFORMAT_IEEEFP): |
| guess = SGILOGDATAFMT_FLOAT; |
| break; |
| case PACK(32, SAMPLEFORMAT_VOID): |
| case PACK(32, SAMPLEFORMAT_UINT): |
| case PACK(32, SAMPLEFORMAT_INT): |
| guess = SGILOGDATAFMT_RAW; |
| break; |
| case PACK(16, SAMPLEFORMAT_VOID): |
| case PACK(16, SAMPLEFORMAT_INT): |
| case PACK(16, SAMPLEFORMAT_UINT): |
| guess = SGILOGDATAFMT_16BIT; |
| break; |
| case PACK( 8, SAMPLEFORMAT_VOID): |
| case PACK( 8, SAMPLEFORMAT_UINT): |
| guess = SGILOGDATAFMT_8BIT; |
| break; |
| default: |
| guess = SGILOGDATAFMT_UNKNOWN; |
| break; |
| #undef PACK |
| } |
| /* |
| * Double-check samples per pixel. |
| */ |
| switch (td->td_samplesperpixel) { |
| case 1: |
| if (guess != SGILOGDATAFMT_RAW) |
| guess = SGILOGDATAFMT_UNKNOWN; |
| break; |
| case 3: |
| if (guess == SGILOGDATAFMT_RAW) |
| guess = SGILOGDATAFMT_UNKNOWN; |
| break; |
| default: |
| guess = SGILOGDATAFMT_UNKNOWN; |
| break; |
| } |
| return (guess); |
| } |
| |
| static int |
| LogLuvInitState(TIFF* tif) |
| { |
| static const char module[] = "LogLuvInitState"; |
| TIFFDirectory* td = &tif->tif_dir; |
| LogLuvState* sp = DecoderState(tif); |
| |
| assert(sp != NULL); |
| assert(td->td_photometric == PHOTOMETRIC_LOGLUV); |
| |
| /* for some reason, we can't do this in TIFFInitLogLuv */ |
| if (td->td_planarconfig != PLANARCONFIG_CONTIG) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "SGILog compression cannot handle non-contiguous data"); |
| return (0); |
| } |
| if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) |
| sp->user_datafmt = LogLuvGuessDataFmt(td); |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->pixel_size = 3*sizeof (float); |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->pixel_size = 3*sizeof (int16); |
| break; |
| case SGILOGDATAFMT_RAW: |
| sp->pixel_size = sizeof (uint32); |
| break; |
| case SGILOGDATAFMT_8BIT: |
| sp->pixel_size = 3*sizeof (uint8); |
| break; |
| default: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "No support for converting user data format to LogLuv"); |
| return (0); |
| } |
| if( isTiled(tif) ) |
| sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); |
| else if( td->td_rowsperstrip < td->td_imagelength ) |
| sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); |
| else |
| sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength); |
| if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || |
| (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { |
| TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); |
| return (0); |
| } |
| return (1); |
| } |
| |
| static int |
| LogLuvFixupTags(TIFF* tif) |
| { |
| (void) tif; |
| return (1); |
| } |
| |
| static int |
| LogLuvSetupDecode(TIFF* tif) |
| { |
| static const char module[] = "LogLuvSetupDecode"; |
| LogLuvState* sp = DecoderState(tif); |
| TIFFDirectory* td = &tif->tif_dir; |
| |
| tif->tif_postdecode = _TIFFNoPostDecode; |
| switch (td->td_photometric) { |
| case PHOTOMETRIC_LOGLUV: |
| if (!LogLuvInitState(tif)) |
| break; |
| if (td->td_compression == COMPRESSION_SGILOG24) { |
| tif->tif_decoderow = LogLuvDecode24; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = Luv24toXYZ; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->tfunc = Luv24toLuv48; |
| break; |
| case SGILOGDATAFMT_8BIT: |
| sp->tfunc = Luv24toRGB; |
| break; |
| } |
| } else { |
| tif->tif_decoderow = LogLuvDecode32; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = Luv32toXYZ; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->tfunc = Luv32toLuv48; |
| break; |
| case SGILOGDATAFMT_8BIT: |
| sp->tfunc = Luv32toRGB; |
| break; |
| } |
| } |
| return (1); |
| case PHOTOMETRIC_LOGL: |
| if (!LogL16InitState(tif)) |
| break; |
| tif->tif_decoderow = LogL16Decode; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = L16toY; |
| break; |
| case SGILOGDATAFMT_8BIT: |
| sp->tfunc = L16toGry; |
| break; |
| } |
| return (1); |
| default: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Inappropriate photometric interpretation %d for SGILog compression; %s", |
| td->td_photometric, "must be either LogLUV or LogL"); |
| break; |
| } |
| return (0); |
| } |
| |
| static int |
| LogLuvSetupEncode(TIFF* tif) |
| { |
| static const char module[] = "LogLuvSetupEncode"; |
| LogLuvState* sp = EncoderState(tif); |
| TIFFDirectory* td = &tif->tif_dir; |
| |
| switch (td->td_photometric) { |
| case PHOTOMETRIC_LOGLUV: |
| if (!LogLuvInitState(tif)) |
| return (0); |
| if (td->td_compression == COMPRESSION_SGILOG24) { |
| tif->tif_encoderow = LogLuvEncode24; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = Luv24fromXYZ; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->tfunc = Luv24fromLuv48; |
| break; |
| case SGILOGDATAFMT_RAW: |
| break; |
| default: |
| goto notsupported; |
| } |
| } else { |
| tif->tif_encoderow = LogLuvEncode32; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = Luv32fromXYZ; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| sp->tfunc = Luv32fromLuv48; |
| break; |
| case SGILOGDATAFMT_RAW: |
| break; |
| default: |
| goto notsupported; |
| } |
| } |
| break; |
| case PHOTOMETRIC_LOGL: |
| if (!LogL16InitState(tif)) |
| return (0); |
| tif->tif_encoderow = LogL16Encode; |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| sp->tfunc = L16fromY; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| break; |
| default: |
| goto notsupported; |
| } |
| break; |
| default: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Inappropriate photometric interpretation %d for SGILog compression; %s", |
| td->td_photometric, "must be either LogLUV or LogL"); |
| return (0); |
| } |
| sp->encoder_state = 1; |
| return (1); |
| notsupported: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "SGILog compression supported only for %s, or raw data", |
| td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); |
| return (0); |
| } |
| |
| static void |
| LogLuvClose(TIFF* tif) |
| { |
| LogLuvState* sp = (LogLuvState*) tif->tif_data; |
| TIFFDirectory *td = &tif->tif_dir; |
| |
| assert(sp != 0); |
| /* |
| * For consistency, we always want to write out the same |
| * bitspersample and sampleformat for our TIFF file, |
| * regardless of the data format being used by the application. |
| * Since this routine is called after tags have been set but |
| * before they have been recorded in the file, we reset them here. |
| * Note: this is really a nasty approach. See PixarLogClose |
| */ |
| if( sp->encoder_state ) |
| { |
| /* See PixarLogClose. Might avoid issues with tags whose size depends |
| * on those below, but not completely sure this is enough. */ |
| td->td_samplesperpixel = |
| (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; |
| td->td_bitspersample = 16; |
| td->td_sampleformat = SAMPLEFORMAT_INT; |
| } |
| } |
| |
| static void |
| LogLuvCleanup(TIFF* tif) |
| { |
| LogLuvState* sp = (LogLuvState *)tif->tif_data; |
| |
| assert(sp != 0); |
| |
| tif->tif_tagmethods.vgetfield = sp->vgetparent; |
| tif->tif_tagmethods.vsetfield = sp->vsetparent; |
| |
| if (sp->tbuf) |
| _TIFFfree(sp->tbuf); |
| _TIFFfree(sp); |
| tif->tif_data = NULL; |
| |
| _TIFFSetDefaultCompressionState(tif); |
| } |
| |
| static int |
| LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) |
| { |
| static const char module[] = "LogLuvVSetField"; |
| LogLuvState* sp = DecoderState(tif); |
| int bps, fmt; |
| |
| switch (tag) { |
| case TIFFTAG_SGILOGDATAFMT: |
| sp->user_datafmt = (int) va_arg(ap, int); |
| /* |
| * Tweak the TIFF header so that the rest of libtiff knows what |
| * size of data will be passed between app and library, and |
| * assume that the app knows what it is doing and is not |
| * confused by these header manipulations... |
| */ |
| switch (sp->user_datafmt) { |
| case SGILOGDATAFMT_FLOAT: |
| bps = 32; |
| fmt = SAMPLEFORMAT_IEEEFP; |
| break; |
| case SGILOGDATAFMT_16BIT: |
| bps = 16; |
| fmt = SAMPLEFORMAT_INT; |
| break; |
| case SGILOGDATAFMT_RAW: |
| bps = 32; |
| fmt = SAMPLEFORMAT_UINT; |
| TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); |
| break; |
| case SGILOGDATAFMT_8BIT: |
| bps = 8; |
| fmt = SAMPLEFORMAT_UINT; |
| break; |
| default: |
| TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
| "Unknown data format %d for LogLuv compression", |
| sp->user_datafmt); |
| return (0); |
| } |
| TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); |
| TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); |
| /* |
| * Must recalculate sizes should bits/sample change. |
| */ |
| tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; |
| tif->tif_scanlinesize = TIFFScanlineSize(tif); |
| return (1); |
| case TIFFTAG_SGILOGENCODE: |
| sp->encode_meth = (int) va_arg(ap, int); |
| if (sp->encode_meth != SGILOGENCODE_NODITHER && |
| sp->encode_meth != SGILOGENCODE_RANDITHER) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Unknown encoding %d for LogLuv compression", |
| sp->encode_meth); |
| return (0); |
| } |
| return (1); |
| default: |
| return (*sp->vsetparent)(tif, tag, ap); |
| } |
| } |
| |
| static int |
| LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) |
| { |
| LogLuvState *sp = (LogLuvState *)tif->tif_data; |
| |
| switch (tag) { |
| case TIFFTAG_SGILOGDATAFMT: |
| *va_arg(ap, int*) = sp->user_datafmt; |
| return (1); |
| default: |
| return (*sp->vgetparent)(tif, tag, ap); |
| } |
| } |
| |
| static const TIFFField LogLuvFields[] = { |
| { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, |
| { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} |
| }; |
| |
| int |
| TIFFInitSGILog(TIFF* tif, int scheme) |
| { |
| static const char module[] = "TIFFInitSGILog"; |
| LogLuvState* sp; |
| |
| assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); |
| |
| /* |
| * Merge codec-specific tag information. |
| */ |
| if (!_TIFFMergeFields(tif, LogLuvFields, |
| TIFFArrayCount(LogLuvFields))) { |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "Merging SGILog codec-specific tags failed"); |
| return 0; |
| } |
| |
| /* |
| * Allocate state block so tag methods have storage to record values. |
| */ |
| tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); |
| if (tif->tif_data == NULL) |
| goto bad; |
| sp = (LogLuvState*) tif->tif_data; |
| _TIFFmemset((void*)sp, 0, sizeof (*sp)); |
| sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; |
| sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? |
| SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; |
| sp->tfunc = _logLuvNop; |
| |
| /* |
| * Install codec methods. |
| * NB: tif_decoderow & tif_encoderow are filled |
| * in at setup time. |
| */ |
| tif->tif_fixuptags = LogLuvFixupTags; |
| tif->tif_setupdecode = LogLuvSetupDecode; |
| tif->tif_decodestrip = LogLuvDecodeStrip; |
| tif->tif_decodetile = LogLuvDecodeTile; |
| tif->tif_setupencode = LogLuvSetupEncode; |
| tif->tif_encodestrip = LogLuvEncodeStrip; |
| tif->tif_encodetile = LogLuvEncodeTile; |
| tif->tif_close = LogLuvClose; |
| tif->tif_cleanup = LogLuvCleanup; |
| |
| /* |
| * Override parent get/set field methods. |
| */ |
| sp->vgetparent = tif->tif_tagmethods.vgetfield; |
| tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ |
| sp->vsetparent = tif->tif_tagmethods.vsetfield; |
| tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ |
| |
| return (1); |
| bad: |
| TIFFErrorExt(tif->tif_clientdata, module, |
| "%s: No space for LogLuv state block", tif->tif_name); |
| return (0); |
| } |
| #endif /* LOGLUV_SUPPORT */ |
| |
| /* vim: set ts=8 sts=8 sw=8 noet: */ |
| /* |
| * Local Variables: |
| * mode: c |
| * c-basic-offset: 8 |
| * fill-column: 78 |
| * End: |
| */ |