/*

 * Copyright (C)2011-2012, 2014-2015, 2017, 2019 D. R. Commander.

 *                                               All Rights Reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * - Redistributions of source code must retain the above copyright notice,

 *   this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 * - Neither the name of the libjpeg-turbo Project nor the names of its

 *   contributors may be used to endorse or promote products derived from this

 *   software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This program demonstrates how to compress, decompress, and transform JPEG

 * images using the TurboJPEG C API

 */

#include <stdio.h></stdio.h>

#include <stdlib.h></stdlib.h>

#include <string.h></string.h>

#include <errno.h></errno.h>

#include <turbojpeg.h></turbojpeg.h>

#ifdef _WIN32

#define strcasecmp  stricmp

#define strncasecmp  strnicmp

#endif

#define THROW(action, message) { \

  printf("ERROR in line %d while %s:\n%s\n", __LINE__, action, message); \

  retval = -1;  goto bailout; \

}

#define THROW_TJ(action)  THROW(action, tjGetErrorStr2(tjInstance))

#define THROW_UNIX(action)  THROW(action, strerror(errno))

#define DEFAULT_SUBSAMP  TJSAMP_444

#define DEFAULT_QUALITY  95

const char *subsampName[TJ_NUMSAMP] = {

  "4:4:4", "4:2:2", "4:2:0", "Grayscale", "4:4:0", "4:1:1"

};

const char *colorspaceName[TJ_NUMCS] = {

  "RGB", "YCbCr", "GRAY", "CMYK", "YCCK"

};

tjscalingfactor *scalingFactors = NULL;

int numScalingFactors = 0;

/* DCT filter example.  This produces a negative of the image. */

static int customFilter(short *coeffs, tjregion arrayRegion,

                        tjregion planeRegion, int componentIndex,

                        int transformIndex, tjtransform *transform)

{

  int i;

  for (i = 0; i < arrayRegion.w * arrayRegion.h; i++)

    coeffs[i] = -coeffs[i];

  return 0;

}

static void usage(char *programName)

{

  int i;

  printf("\nUSAGE: %s <input image=""> <output image=""> [options]\n\n",</output>

         programName);

  printf("Input and output images can be in Windows BMP or PBMPLUS (PPM/PGM) format.  If\n");

  printf("either filename ends in a .jpg extension, then the TurboJPEG API will be used\n");

  printf("to compress or decompress the image.\n\n");

  printf("Compression Options (used if the output image is a JPEG image)\n");

  printf("--------------------------------------------------------------\n\n");

  printf("-subsamp <444|422|420|gray> = Apply this level of chrominance subsampling when\n");

  printf("     compressing the output image.  The default is to use the same level of\n");

  printf("     subsampling as in the input image, if the input image is also a JPEG\n");

  printf("     image, or to use grayscale if the input image is a grayscale non-JPEG\n");

  printf("     image, or to use %s subsampling otherwise.\n\n",

         subsampName[DEFAULT_SUBSAMP]);

  printf("-q <1-100> = Compress the output image with this JPEG quality level\n");

  printf("     (default = %d).\n\n", DEFAULT_QUALITY);

  printf("Decompression Options (used if the input image is a JPEG image)\n");

  printf("---------------------------------------------------------------\n\n");

  printf("-scale M/N = Scale the input image by a factor of M/N when decompressing it.\n");

  printf("(M/N = ");

  for (i = 0; i < numScalingFactors; i++) {

    printf("%d/%d", scalingFactors[i].num, scalingFactors[i].denom);

    if (numScalingFactors == 2 && i != numScalingFactors - 1)

      printf(" or ");

    else if (numScalingFactors > 2) {

      if (i != numScalingFactors - 1)

        printf(", ");

      if (i == numScalingFactors - 2)

        printf("or ");

    }

  }

  printf(")\n\n");

  printf("-hflip, -vflip, -transpose, -transverse, -rot90, -rot180, -rot270 =\n");

  printf("     Perform one of these lossless transform operations on the input image\n");

  printf("     prior to decompressing it (these options are mutually exclusive.)\n\n");

  printf("-grayscale = Perform lossless grayscale conversion on the input image prior\n");

  printf("     to decompressing it (can be combined with the other transform operations\n");

  printf("     above.)\n\n");

  printf("-crop WxH+X+Y = Perform lossless cropping on the input image prior to\n");

  printf("     decompressing it.  X and Y specify the upper left corner of the cropping\n");

  printf("     region, and W and H specify the width and height of the cropping region.\n");

  printf("     X and Y must be evenly divible by the MCU block size (8x8 if the input\n");

  printf("     image was compressed using no subsampling or grayscale, 16x8 if it was\n");

  printf("     compressed using 4:2:2 subsampling, or 16x16 if it was compressed using\n");

  printf("     4:2:0 subsampling.)\n\n");

  printf("General Options\n");

  printf("---------------\n\n");

  printf("-fastupsample = Use the fastest chrominance upsampling algorithm available in\n");

  printf("     the underlying codec.\n\n");

  printf("-fastdct = Use the fastest DCT/IDCT algorithms available in the underlying\n");

  printf("     codec.\n\n");

  printf("-accuratedct = Use the most accurate DCT/IDCT algorithms available in the\n");

  printf("     underlying codec.\n\n");

  exit(1);

}

int main(int argc, char **argv)

{

  tjscalingfactor scalingFactor = { 1, 1 };

  int outSubsamp = -1, outQual = -1;

  tjtransform xform;

  int flags = 0;

  int width, height;

  char *inFormat, *outFormat;

  FILE *jpegFile = NULL;

  unsigned char *imgBuf = NULL, *jpegBuf = NULL;

  int retval = 0, i, pixelFormat = TJPF_UNKNOWN;

  tjhandle tjInstance = NULL;

  if ((scalingFactors = tjGetScalingFactors(&numScalingFactors)) == NULL)

    THROW_TJ("getting scaling factors");

  memset(&xform, 0, sizeof(tjtransform));

  if (argc < 3)

    usage(argv[0]);

  /* Parse arguments. */

  for (i = 3; i < argc; i++) {

    if (!strncasecmp(argv[i], "-sc", 3) && i < argc - 1) {

      int match = 0, temp1 = 0, temp2 = 0, j;

      if (sscanf(argv[++i], "%d/%d", &temp1, &temp2) < 2)

        usage(argv[0]);

      for (j = 0; j < numScalingFactors; j++) {

        if ((double)temp1 / (double)temp2 == (double)scalingFactors[j].num /

                                             (double)scalingFactors[j].denom) {

          scalingFactor = scalingFactors[j];

          match = 1;

          break;

        }

      }

      if (match != 1)

        usage(argv[0]);

    } else if (!strncasecmp(argv[i], "-su", 3) && i < argc - 1) {

      i++;

      if (!strncasecmp(argv[i], "g", 1))

        outSubsamp = TJSAMP_GRAY;

      else if (!strcasecmp(argv[i], "444"))

        outSubsamp = TJSAMP_444;

      else if (!strcasecmp(argv[i], "422"))

        outSubsamp = TJSAMP_422;

      else if (!strcasecmp(argv[i], "420"))

        outSubsamp = TJSAMP_420;

      else

        usage(argv[0]);

    } else if (!strncasecmp(argv[i], "-q", 2) && i < argc - 1) {

      outQual = atoi(argv[++i]);

      if (outQual < 1 || outQual > 100)

        usage(argv[0]);

    } else if (!strncasecmp(argv[i], "-g", 2))

      xform.options |= TJXOPT_GRAY;

    else if (!strcasecmp(argv[i], "-hflip"))

      xform.op = TJXOP_HFLIP;

    else if (!strcasecmp(argv[i], "-vflip"))

      xform.op = TJXOP_VFLIP;

    else if (!strcasecmp(argv[i], "-transpose"))

      xform.op = TJXOP_TRANSPOSE;

    else if (!strcasecmp(argv[i], "-transverse"))

      xform.op = TJXOP_TRANSVERSE;

    else if (!strcasecmp(argv[i], "-rot90"))

      xform.op = TJXOP_ROT90;

    else if (!strcasecmp(argv[i], "-rot180"))

      xform.op = TJXOP_ROT180;

    else if (!strcasecmp(argv[i], "-rot270"))

      xform.op = TJXOP_ROT270;

    else if (!strcasecmp(argv[i], "-custom"))

      xform.customFilter = customFilter;

    else if (!strncasecmp(argv[i], "-c", 2) && i < argc - 1) {

      if (sscanf(argv[++i], "%dx%d+%d+%d", &xform.r.w, &xform.r.h, &xform.r.x,

                 &xform.r.y) < 4 ||

          xform.r.x < 0 || xform.r.y < 0 || xform.r.w < 1 || xform.r.h < 1)

        usage(argv[0]);

      xform.options |= TJXOPT_CROP;

    } else if (!strcasecmp(argv[i], "-fastupsample")) {

      printf("Using fast upsampling code\n");

      flags |= TJFLAG_FASTUPSAMPLE;

    } else if (!strcasecmp(argv[i], "-fastdct")) {

      printf("Using fastest DCT/IDCT algorithm\n");

      flags |= TJFLAG_FASTDCT;

    } else if (!strcasecmp(argv[i], "-accuratedct")) {

      printf("Using most accurate DCT/IDCT algorithm\n");

      flags |= TJFLAG_ACCURATEDCT;

    } else usage(argv[0]);

  }

  /* Determine input and output image formats based on file extensions. */

  inFormat = strrchr(argv[1], '.');

  outFormat = strrchr(argv[2], '.');

  if (inFormat == NULL || outFormat == NULL || strlen(inFormat) < 2 ||

      strlen(outFormat) < 2)

    usage(argv[0]);

  inFormat = &inFormat[1];

  outFormat = &outFormat[1];

  if (!strcasecmp(inFormat, "jpg")) {

    /* Input image is a JPEG image.  Decompress and/or transform it. */

    long size;

    int inSubsamp, inColorspace;

    int doTransform = (xform.op != TJXOP_NONE || xform.options != 0 ||

                       xform.customFilter != NULL);

    unsigned long jpegSize;

    /* Read the JPEG file into memory. */

    if ((jpegFile = fopen(argv[1], "rb")) == NULL)

      THROW_UNIX("opening input file");

    if (fseek(jpegFile, 0, SEEK_END) < 0 || ((size = ftell(jpegFile)) < 0) ||

        fseek(jpegFile, 0, SEEK_SET) < 0)

      THROW_UNIX("determining input file size");

    if (size == 0)

      THROW("determining input file size", "Input file contains no data");

    jpegSize = (unsigned long)size;

    if ((jpegBuf = (unsigned char *)tjAlloc(jpegSize)) == NULL)

      THROW_UNIX("allocating JPEG buffer");

    if (fread(jpegBuf, jpegSize, 1, jpegFile) < 1)

      THROW_UNIX("reading input file");

    fclose(jpegFile);  jpegFile = NULL;

    if (doTransform) {

      /* Transform it. */

      unsigned char *dstBuf = NULL;  /* Dynamically allocate the JPEG buffer */

      unsigned long dstSize = 0;

      if ((tjInstance = tjInitTransform()) == NULL)

        THROW_TJ("initializing transformer");

      xform.options |= TJXOPT_TRIM;

      if (tjTransform(tjInstance, jpegBuf, jpegSize, 1, &dstBuf, &dstSize,

                      &xform, flags) < 0)

        THROW_TJ("transforming input image");

      tjFree(jpegBuf);

      jpegBuf = dstBuf;

      jpegSize = dstSize;

    } else {

      if ((tjInstance = tjInitDecompress()) == NULL)

        THROW_TJ("initializing decompressor");

    }

    if (tjDecompressHeader3(tjInstance, jpegBuf, jpegSize, &width, &height,

                            &inSubsamp, &inColorspace) < 0)

      THROW_TJ("reading JPEG header");

    printf("%s Image:  %d x %d pixels, %s subsampling, %s colorspace\n",

           (doTransform ? "Transformed" : "Input"), width, height,

           subsampName[inSubsamp], colorspaceName[inColorspace]);

    if (!strcasecmp(outFormat, "jpg") && doTransform &&

        scalingFactor.num == 1 && scalingFactor.denom == 1 && outSubsamp < 0 &&

        outQual < 0) {

      /* Input image has been transformed, and no re-compression options

         have been selected.  Write the transformed image to disk and exit. */

      if ((jpegFile = fopen(argv[2], "wb")) == NULL)

        THROW_UNIX("opening output file");

      if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)

        THROW_UNIX("writing output file");

      fclose(jpegFile);  jpegFile = NULL;

      goto bailout;

    }

    /* Scaling and/or a non-JPEG output image format and/or compression options

       have been selected, so we need to decompress the input/transformed

       image. */

    width = TJSCALED(width, scalingFactor);

    height = TJSCALED(height, scalingFactor);

    if (outSubsamp < 0)

      outSubsamp = inSubsamp;

    pixelFormat = TJPF_BGRX;

    if ((imgBuf = (unsigned char *)tjAlloc(width * height *

                                           tjPixelSize[pixelFormat])) == NULL)

      THROW_UNIX("allocating uncompressed image buffer");

    if (tjDecompress2(tjInstance, jpegBuf, jpegSize, imgBuf, width, 0, height,

                      pixelFormat, flags) < 0)

      THROW_TJ("decompressing JPEG image");

    tjFree(jpegBuf);  jpegBuf = NULL;

    tjDestroy(tjInstance);  tjInstance = NULL;

  } else {

    /* Input image is not a JPEG image.  Load it into memory. */

    if ((imgBuf = tjLoadImage(argv[1], &width, 1, &height, &pixelFormat,

                              0)) == NULL)

      THROW_TJ("loading input image");

    if (outSubsamp < 0) {

      if (pixelFormat == TJPF_GRAY)

        outSubsamp = TJSAMP_GRAY;

      else

        outSubsamp = TJSAMP_444;

    }

    printf("Input Image:  %d x %d pixels\n", width, height);

  }

  printf("Output Image (%s):  %d x %d pixels", outFormat, width, height);

  if (!strcasecmp(outFormat, "jpg")) {

    /* Output image format is JPEG.  Compress the uncompressed image. */

    unsigned long jpegSize = 0;

    jpegBuf = NULL;  /* Dynamically allocate the JPEG buffer */

    if (outQual < 0)

      outQual = DEFAULT_QUALITY;

    printf(", %s subsampling, quality = %d\n", subsampName[outSubsamp],

           outQual);

    if ((tjInstance = tjInitCompress()) == NULL)

      THROW_TJ("initializing compressor");

    if (tjCompress2(tjInstance, imgBuf, width, 0, height, pixelFormat,

                    &jpegBuf, &jpegSize, outSubsamp, outQual, flags) < 0)

      THROW_TJ("compressing image");

    tjDestroy(tjInstance);  tjInstance = NULL;

    /* Write the JPEG image to disk. */

    if ((jpegFile = fopen(argv[2], "wb")) == NULL)

      THROW_UNIX("opening output file");

    if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1)

      THROW_UNIX("writing output file");

    tjDestroy(tjInstance);  tjInstance = NULL;

    fclose(jpegFile);  jpegFile = NULL;

    tjFree(jpegBuf);  jpegBuf = NULL;

  } else {

    /* Output image format is not JPEG.  Save the uncompressed image

       directly to disk. */

    printf("\n");

    if (tjSaveImage(argv[2], imgBuf, width, 0, height, pixelFormat, 0) < 0)

      THROW_TJ("saving output image");

  }

bailout:

  tjFree(imgBuf);

  if (tjInstance) tjDestroy(tjInstance);

  tjFree(jpegBuf);

  if (jpegFile) fclose(jpegFile);

  return retval;

}