| /* |
| * Copyright (C)2011-2012, 2014-2015, 2017 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> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <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 _throwtj(action) _throw(action, tjGetErrorStr2(tjInstance)) |
| |
| #define _throwunix(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. */ |
| |
| 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; |
| } |
| |
| |
| void usage(char *programName) |
| { |
| int i; |
| |
| printf("\nUSAGE: %s <Input image> <Output image> [options]\n\n", |
| 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) |
| _throwtj("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) |
| _throwunix("opening input file"); |
| if (fseek(jpegFile, 0, SEEK_END) < 0 || ((size = ftell(jpegFile)) < 0) || |
| fseek(jpegFile, 0, SEEK_SET) < 0) |
| _throwunix("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) |
| _throwunix("allocating JPEG buffer"); |
| if (fread(jpegBuf, jpegSize, 1, jpegFile) < 1) |
| _throwunix("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) |
| _throwtj("initializing transformer"); |
| xform.options |= TJXOPT_TRIM; |
| if (tjTransform(tjInstance, jpegBuf, jpegSize, 1, &dstBuf, &dstSize, |
| &xform, flags) < 0) |
| _throwtj("transforming input image"); |
| tjFree(jpegBuf); |
| jpegBuf = dstBuf; |
| jpegSize = dstSize; |
| } else { |
| if ((tjInstance = tjInitDecompress()) == NULL) |
| _throwtj("initializing decompressor"); |
| } |
| |
| if (tjDecompressHeader3(tjInstance, jpegBuf, jpegSize, &width, &height, |
| &inSubsamp, &inColorspace) < 0) |
| _throwtj("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) |
| _throwunix("opening output file"); |
| if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1) |
| _throwunix("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) |
| _throwunix("allocating uncompressed image buffer"); |
| |
| if (tjDecompress2(tjInstance, jpegBuf, jpegSize, imgBuf, width, 0, height, |
| pixelFormat, flags) < 0) |
| _throwtj("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) |
| _throwtj("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 char *jpegBuf = NULL; /* Dynamically allocate the JPEG buffer */ |
| unsigned long jpegSize = 0; |
| |
| if (outQual < 0) |
| outQual = DEFAULT_QUALITY; |
| printf(", %s subsampling, quality = %d\n", subsampName[outSubsamp], |
| outQual); |
| |
| if ((tjInstance = tjInitCompress()) == NULL) |
| _throwtj("initializing compressor"); |
| if (tjCompress2(tjInstance, imgBuf, width, 0, height, pixelFormat, |
| &jpegBuf, &jpegSize, outSubsamp, outQual, flags) < 0) |
| _throwtj("compressing image"); |
| tjDestroy(tjInstance); tjInstance = NULL; |
| |
| /* Write the JPEG image to disk. */ |
| if ((jpegFile = fopen(argv[2], "wb")) == NULL) |
| _throwunix("opening output file"); |
| if (fwrite(jpegBuf, jpegSize, 1, jpegFile) < 1) |
| _throwunix("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) |
| _throwtj("saving output image"); |
| } |
| |
| bailout: |
| if (imgBuf) tjFree(imgBuf); |
| if (tjInstance) tjDestroy(tjInstance); |
| if (jpegBuf) tjFree(jpegBuf); |
| if (jpegFile) fclose(jpegFile); |
| return retval; |
| } |
