| 1 | /*
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| 2 | * File: ximajpg.cpp
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| 3 | * Purpose: Platform Independent JPEG Image Class Loader and Writer
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| 4 | * 07/Aug/2001 Davide Pizzolato - www.xdp.it
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| 5 | * CxImage version 6.0.0 02/Feb/2008
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| 6 | */
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| 7 |
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| 8 | #include "ximajpg.h"
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| 9 |
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| 10 | #if CXIMAGE_SUPPORT_JPG
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| 11 |
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| 12 | #include "jpeg/jmorecfg.h"
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| 13 |
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| 14 | #include "ximaiter.h"
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| 15 |
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| 16 | #include <setjmp.h>
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| 17 |
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| 18 | struct jpg_error_mgr {
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| 19 | struct jpeg_error_mgr pub; /* "public" fields */
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| 20 | jmp_buf setjmp_buffer; /* for return to caller */
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| 21 | char* buffer; /* error message <CSC>*/
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| 22 | };
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| 23 | typedef jpg_error_mgr *jpg_error_ptr;
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| 24 |
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| 25 | ////////////////////////////////////////////////////////////////////////////////
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| 26 | // Here's the routine that will replace the standard error_exit method:
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| 27 | ////////////////////////////////////////////////////////////////////////////////
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| 28 | static void
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| 29 | ima_jpeg_error_exit (j_common_ptr cinfo)
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| 30 | {
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| 31 | /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
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| 32 | jpg_error_ptr myerr = (jpg_error_ptr) cinfo->err;
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| 33 | /* Create the message */
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| 34 | myerr->pub.format_message (cinfo, myerr->buffer);
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| 35 | /* Send it to stderr, adding a newline */
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| 36 | /* Return control to the setjmp point */
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| 37 | longjmp(myerr->setjmp_buffer, 1);
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| 38 | }
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| 39 | ////////////////////////////////////////////////////////////////////////////////
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| 40 | CxImageJPG::CxImageJPG(): CxImage(CXIMAGE_FORMAT_JPG)
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| 41 | {
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| 42 | #if CXIMAGEJPG_SUPPORT_EXIF
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| 43 | m_exif = NULL;
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| 44 | memset(&m_exifinfo, 0, sizeof(EXIFINFO));
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| 45 | #endif
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| 46 | }
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| 47 | ////////////////////////////////////////////////////////////////////////////////
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| 48 | CxImageJPG::~CxImageJPG()
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| 49 | {
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| 50 | #if CXIMAGEJPG_SUPPORT_EXIF
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| 51 | if (m_exif) delete m_exif;
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| 52 | #endif
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| 53 | }
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| 54 | ////////////////////////////////////////////////////////////////////////////////
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| 55 | #if CXIMAGEJPG_SUPPORT_EXIF
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| 56 | bool CxImageJPG::DecodeExif(CxFile * hFile)
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| 57 | {
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| 58 | m_exif = new CxExifInfo(&m_exifinfo);
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| 59 | if (m_exif){
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| 60 | long pos=hFile->Tell();
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| 61 | m_exif->DecodeExif(hFile);
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| 62 | hFile->Seek(pos,SEEK_SET);
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| 63 | return m_exif->m_exifinfo->IsExif;
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| 64 | } else {
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| 65 | return false;
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| 66 | }
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| 67 | }
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| 68 | #endif //CXIMAGEJPG_SUPPORT_EXIF
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| 69 | ////////////////////////////////////////////////////////////////////////////////
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| 70 | #if CXIMAGE_SUPPORT_DECODE
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| 71 | ////////////////////////////////////////////////////////////////////////////////
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| 72 | bool CxImageJPG::Decode(CxFile * hFile)
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| 73 | {
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| 74 |
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| 75 | bool is_exif = false;
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| 76 | #if CXIMAGEJPG_SUPPORT_EXIF
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| 77 | is_exif = DecodeExif(hFile);
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| 78 | #endif
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| 79 |
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| 80 | CImageIterator iter(this);
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| 81 | /* This struct contains the JPEG decompression parameters and pointers to
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| 82 | * working space (which is allocated as needed by the JPEG library).
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| 83 | */
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| 84 | struct jpeg_decompress_struct cinfo;
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| 85 | /* We use our private extension JPEG error handler. <CSC> */
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| 86 | struct jpg_error_mgr jerr;
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| 87 | jerr.buffer=info.szLastError;
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| 88 | /* More stuff */
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| 89 | JSAMPARRAY buffer; /* Output row buffer */
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| 90 | int row_stride; /* physical row width in output buffer */
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| 91 |
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| 92 | /* In this example we want to open the input file before doing anything else,
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| 93 | * so that the setjmp() error recovery below can assume the file is open.
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| 94 | * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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| 95 | * requires it in order to read binary files.
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| 96 | */
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| 97 |
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| 98 | /* Step 1: allocate and initialize JPEG decompression object */
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| 99 | /* We set up the normal JPEG error routines, then override error_exit. */
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| 100 | cinfo.err = jpeg_std_error(&jerr.pub);
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| 101 | jerr.pub.error_exit = ima_jpeg_error_exit;
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| 102 |
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| 103 | /* Establish the setjmp return context for my_error_exit to use. */
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| 104 | if (setjmp(jerr.setjmp_buffer)) {
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| 105 | /* If we get here, the JPEG code has signaled an error.
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| 106 | * We need to clean up the JPEG object, close the input file, and return.
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| 107 | */
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| 108 | jpeg_destroy_decompress(&cinfo);
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| 109 | return 0;
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| 110 | }
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| 111 | /* Now we can initialize the JPEG decompression object. */
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| 112 | jpeg_create_decompress(&cinfo);
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| 113 |
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| 114 | /* Step 2: specify data source (eg, a file) */
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| 115 | //jpeg_stdio_src(&cinfo, infile);
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| 116 | CxFileJpg src(hFile);
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| 117 | cinfo.src = &src;
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| 118 |
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| 119 | /* Step 3: read file parameters with jpeg_read_header() */
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| 120 | (void) jpeg_read_header(&cinfo, TRUE);
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| 121 |
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| 122 | /* Step 4 <chupeev> handle decoder options*/
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| 123 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_GRAYSCALE) != 0)
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| 124 | cinfo.out_color_space = JCS_GRAYSCALE;
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| 125 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_QUANTIZE) != 0) {
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| 126 | cinfo.quantize_colors = TRUE;
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| 127 | cinfo.desired_number_of_colors = GetJpegQuality();
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| 128 | }
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| 129 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_DITHER) != 0)
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| 130 | cinfo.dither_mode = m_nDither;
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| 131 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_ONEPASS) != 0)
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| 132 | cinfo.two_pass_quantize = FALSE;
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| 133 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_NOSMOOTH) != 0)
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| 134 | cinfo.do_fancy_upsampling = FALSE;
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| 135 |
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| 136 | //<DP>: Load true color images as RGB (no quantize)
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| 137 | /* Step 4: set parameters for decompression */
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| 138 | /* if (cinfo.jpeg_color_space!=JCS_GRAYSCALE) {
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| 139 | * cinfo.quantize_colors = TRUE;
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| 140 | * cinfo.desired_number_of_colors = 128;
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| 141 | *}
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| 142 | */ //</DP>
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| 143 |
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| 144 | // Set the scale <ignacio>
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| 145 | cinfo.scale_denom = GetJpegScale();
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| 146 |
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| 147 | // Borrowed the idea from GIF implementation <ignacio>
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| 148 | if (info.nEscape == -1) {
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| 149 | // Return output dimensions only
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| 150 | jpeg_calc_output_dimensions(&cinfo);
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| 151 | head.biWidth = cinfo.output_width;
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| 152 | head.biHeight = cinfo.output_height;
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| 153 | info.dwType = CXIMAGE_FORMAT_JPG;
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| 154 | jpeg_destroy_decompress(&cinfo);
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| 155 | return true;
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| 156 | }
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| 157 |
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| 158 | /* Step 5: Start decompressor */
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| 159 | jpeg_start_decompress(&cinfo);
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| 160 |
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| 161 | /* We may need to do some setup of our own at this point before reading
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| 162 | * the data. After jpeg_start_decompress() we have the correct scaled
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| 163 | * output image dimensions available, as well as the output colormap
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| 164 | * if we asked for color quantization.
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| 165 | */
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| 166 | //Create the image using output dimensions <ignacio>
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| 167 | //Create(cinfo.image_width, cinfo.image_height, 8*cinfo.output_components, CXIMAGE_FORMAT_JPG);
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| 168 | Create(cinfo.output_width, cinfo.output_height, 8*cinfo.output_components, CXIMAGE_FORMAT_JPG);
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| 169 |
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| 170 | if (!pDib) longjmp(jerr.setjmp_buffer, 1); //<DP> check if the image has been created
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| 171 |
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| 172 | if (is_exif){
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| 173 | #if CXIMAGEJPG_SUPPORT_EXIF
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| 174 | if ((m_exifinfo.Xresolution != 0.0) && (m_exifinfo.ResolutionUnit != 0))
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| 175 | SetXDPI((long)(m_exifinfo.Xresolution/m_exifinfo.ResolutionUnit));
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| 176 | if ((m_exifinfo.Yresolution != 0.0) && (m_exifinfo.ResolutionUnit != 0))
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| 177 | SetYDPI((long)(m_exifinfo.Yresolution/m_exifinfo.ResolutionUnit));
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| 178 | #endif
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| 179 | } else {
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| 180 | switch (cinfo.density_unit) {
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| 181 | case 0: // [andy] fix for aspect ratio...
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| 182 | if((cinfo.Y_density > 0) && (cinfo.X_density > 0)){
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| 183 | SetYDPI((long)(GetXDPI()*(float(cinfo.Y_density)/float(cinfo.X_density))));
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| 184 | }
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| 185 | break;
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| 186 | case 2: // [andy] fix: cinfo.X/Y_density is pixels per centimeter
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| 187 | SetXDPI((long)floor(cinfo.X_density * 2.54 + 0.5));
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| 188 | SetYDPI((long)floor(cinfo.Y_density * 2.54 + 0.5));
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| 189 | break;
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| 190 | default:
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| 191 | SetXDPI(cinfo.X_density);
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| 192 | SetYDPI(cinfo.Y_density);
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| 193 | }
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| 194 | }
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| 195 |
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| 196 | if (cinfo.out_color_space==JCS_GRAYSCALE){
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| 197 | SetGrayPalette();
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| 198 | head.biClrUsed =256;
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| 199 | } else {
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| 200 | if (cinfo.quantize_colors){
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| 201 | SetPalette(cinfo.actual_number_of_colors, cinfo.colormap[0], cinfo.colormap[1], cinfo.colormap[2]);
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| 202 | head.biClrUsed=cinfo.actual_number_of_colors;
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| 203 | } else {
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| 204 | head.biClrUsed=0;
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| 205 | }
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| 206 | }
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| 207 |
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| 208 | /* JSAMPLEs per row in output buffer */
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| 209 | row_stride = cinfo.output_width * cinfo.output_components;
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| 210 |
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| 211 | /* Make a one-row-high sample array that will go away when done with image */
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| 212 | buffer = (*cinfo.mem->alloc_sarray)
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| 213 | ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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| 214 |
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| 215 | /* Step 6: while (scan lines remain to be read) */
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| 216 | /* jpeg_read_scanlines(...); */
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| 217 | /* Here we use the library's state variable cinfo.output_scanline as the
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| 218 | * loop counter, so that we don't have to keep track ourselves.
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| 219 | */
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| 220 | iter.Upset();
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| 221 | while (cinfo.output_scanline < cinfo.output_height) {
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| 222 |
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| 223 | if (info.nEscape) longjmp(jerr.setjmp_buffer, 1); // <vho> - cancel decoding
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| 224 |
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| 225 | (void) jpeg_read_scanlines(&cinfo, buffer, 1);
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| 226 | // info.nProgress = (long)(100*cinfo.output_scanline/cinfo.output_height);
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| 227 | //<DP> Step 6a: CMYK->RGB */
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| 228 | if ((cinfo.num_components==4)&&(cinfo.quantize_colors==FALSE)){
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| 229 | BYTE k,*dst,*src;
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| 230 | dst=iter.GetRow();
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| 231 | src=buffer[0];
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| 232 | for(long x3=0,x4=0; x3<(long)info.dwEffWidth && x4<row_stride; x3+=3, x4+=4){
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| 233 | k=src[x4+3];
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| 234 | dst[x3] =(BYTE)((k * src[x4+2])/255);
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| 235 | dst[x3+1]=(BYTE)((k * src[x4+1])/255);
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| 236 | dst[x3+2]=(BYTE)((k * src[x4+0])/255);
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| 237 | }
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| 238 | } else {
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| 239 | /* Assume put_scanline_someplace wants a pointer and sample count. */
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| 240 | iter.SetRow(buffer[0], row_stride);
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| 241 | }
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| 242 | iter.PrevRow();
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| 243 | }
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| 244 |
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| 245 | /* Step 7: Finish decompression */
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| 246 | (void) jpeg_finish_decompress(&cinfo);
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| 247 | /* We can ignore the return value since suspension is not possible
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| 248 | * with the stdio data source.
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| 249 | */
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| 250 |
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| 251 | //<DP> Step 7A: Swap red and blue components
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| 252 | // not necessary if swapped red and blue definition in jmorecfg.h;ln322 <W. Morrison>
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| 253 | if ((cinfo.num_components==3)&&(cinfo.quantize_colors==FALSE)){
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| 254 | BYTE* r0=GetBits();
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| 255 | for(long y=0;y<head.biHeight;y++){
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| 256 | if (info.nEscape) longjmp(jerr.setjmp_buffer, 1); // <vho> - cancel decoding
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| 257 | RGBtoBGR(r0,3*head.biWidth);
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| 258 | r0+=info.dwEffWidth;
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| 259 | }
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| 260 | }
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| 261 |
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| 262 | /* Step 8: Release JPEG decompression object */
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| 263 | /* This is an important step since it will release a good deal of memory. */
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| 264 | jpeg_destroy_decompress(&cinfo);
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| 265 |
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| 266 | /* At this point you may want to check to see whether any corrupt-data
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| 267 | * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
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| 268 | */
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| 269 |
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| 270 | /* And we're done! */
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| 271 | return true;
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| 272 | }
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| 273 | ////////////////////////////////////////////////////////////////////////////////
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| 274 | #endif //CXIMAGE_SUPPORT_DECODE
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| 275 | ////////////////////////////////////////////////////////////////////////////////
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| 276 | #if CXIMAGE_SUPPORT_ENCODE
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| 277 | ////////////////////////////////////////////////////////////////////////////////
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| 278 | bool CxImageJPG::Encode(CxFile * hFile)
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| 279 | {
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| 280 | if (EncodeSafeCheck(hFile)) return false;
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| 281 |
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| 282 | if (head.biClrUsed!=0 && !IsGrayScale()){
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| 283 | strcpy(info.szLastError,"JPEG can save only RGB or GreyScale images");
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| 284 | return false;
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| 285 | }
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| 286 |
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| 287 | // necessary for EXIF, and for roll backs
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| 288 | long pos=hFile->Tell();
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| 289 |
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| 290 | /* This struct contains the JPEG compression parameters and pointers to
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| 291 | * working space (which is allocated as needed by the JPEG library).
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| 292 | * It is possible to have several such structures, representing multiple
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| 293 | * compression/decompression processes, in existence at once. We refer
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| 294 | * to any one struct (and its associated working data) as a "JPEG object".
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| 295 | */
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| 296 | struct jpeg_compress_struct cinfo;
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| 297 | /* This struct represents a JPEG error handler. It is declared separately
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| 298 | * because applications often want to supply a specialized error handler
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| 299 | * (see the second half of this file for an example). But here we just
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| 300 | * take the easy way out and use the standard error handler, which will
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| 301 | * print a message on stderr and call exit() if compression fails.
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| 302 | * Note that this struct must live as long as the main JPEG parameter
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| 303 | * struct, to avoid dangling-pointer problems.
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| 304 | */
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| 305 | //struct jpeg_error_mgr jerr;
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| 306 | /* We use our private extension JPEG error handler. <CSC> */
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| 307 | struct jpg_error_mgr jerr;
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| 308 | jerr.buffer=info.szLastError;
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| 309 | /* More stuff */
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| 310 | int row_stride; /* physical row width in image buffer */
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| 311 | JSAMPARRAY buffer; /* Output row buffer */
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| 312 |
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| 313 | /* Step 1: allocate and initialize JPEG compression object */
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| 314 | /* We have to set up the error handler first, in case the initialization
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| 315 | * step fails. (Unlikely, but it could happen if you are out of memory.)
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| 316 | * This routine fills in the contents of struct jerr, and returns jerr's
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| 317 | * address which we place into the link field in cinfo.
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| 318 | */
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| 319 | //cinfo.err = jpeg_std_error(&jerr); <CSC>
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| 320 | /* We set up the normal JPEG error routines, then override error_exit. */
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| 321 | cinfo.err = jpeg_std_error(&jerr.pub);
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| 322 | jerr.pub.error_exit = ima_jpeg_error_exit;
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| 323 |
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| 324 | /* Establish the setjmp return context for my_error_exit to use. */
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| 325 | if (setjmp(jerr.setjmp_buffer)) {
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| 326 | /* If we get here, the JPEG code has signaled an error.
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| 327 | * We need to clean up the JPEG object, close the input file, and return.
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| 328 | */
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| 329 | strcpy(info.szLastError, jerr.buffer); //<CSC>
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| 330 | jpeg_destroy_compress(&cinfo);
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| 331 | return 0;
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| 332 | }
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| 333 |
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| 334 | /* Now we can initialize the JPEG compression object. */
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| 335 | jpeg_create_compress(&cinfo);
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| 336 | /* Step 2: specify data destination (eg, a file) */
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| 337 | /* Note: steps 2 and 3 can be done in either order. */
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| 338 | /* Here we use the library-supplied code to send compressed data to a
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| 339 | * stdio stream. You can also write your own code to do something else.
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| 340 | * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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| 341 | * requires it in order to write binary files.
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| 342 | */
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| 343 |
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| 344 | //jpeg_stdio_dest(&cinfo, outfile);
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| 345 | CxFileJpg dest(hFile);
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| 346 | cinfo.dest = &dest;
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| 347 |
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| 348 | /* Step 3: set parameters for compression */
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| 349 | /* First we supply a description of the input image.
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| 350 | * Four fields of the cinfo struct must be filled in:
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| 351 | */
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| 352 | cinfo.image_width = GetWidth(); // image width and height, in pixels
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| 353 | cinfo.image_height = GetHeight();
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| 354 |
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| 355 | if (IsGrayScale()){
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| 356 | cinfo.input_components = 1; // # of color components per pixel
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| 357 | cinfo.in_color_space = JCS_GRAYSCALE; /* colorspace of input image */
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| 358 | } else {
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| 359 | cinfo.input_components = 3; // # of color components per pixel
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| 360 | cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
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| 361 | }
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| 362 |
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| 363 | /* Now use the library's routine to set default compression parameters.
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| 364 | * (You must set at least cinfo.in_color_space before calling this,
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| 365 | * since the defaults depend on the source color space.)
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| 366 | */
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| 367 | jpeg_set_defaults(&cinfo);
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| 368 | /* Now you can set any non-default parameters you wish to.
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| 369 | * Here we just illustrate the use of quality (quantization table) scaling:
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| 370 | */
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| 371 |
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| 372 | //#ifdef C_ARITH_CODING_SUPPORTED
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| 373 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_ARITHMETIC) != 0)
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| 374 | cinfo.arith_code = TRUE;
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| 375 | //#endif
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| 376 |
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| 377 | //#ifdef ENTROPY_OPT_SUPPORTED
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| 378 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_OPTIMIZE) != 0)
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| 379 | cinfo.optimize_coding = TRUE;
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| 380 | //#endif
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| 381 |
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| 382 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_GRAYSCALE) != 0)
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| 383 | jpeg_set_colorspace(&cinfo, JCS_GRAYSCALE);
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| 384 |
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| 385 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SMOOTHING) != 0)
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| 386 | cinfo.smoothing_factor = m_nSmoothing;
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| 387 |
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| 388 | jpeg_set_quality(&cinfo, GetJpegQuality(), (GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_BASELINE) != 0);
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| 389 |
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| 390 | //#ifdef C_PROGRESSIVE_SUPPORTED
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| 391 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_PROGRESSIVE) != 0)
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| 392 | jpeg_simple_progression(&cinfo);
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| 393 | //#endif
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| 394 |
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| 395 | #ifdef C_LOSSLESS_SUPPORTED
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| 396 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_LOSSLESS) != 0)
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| 397 | jpeg_simple_lossless(&cinfo, m_nPredictor, m_nPointTransform);
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| 398 | #endif
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| 399 |
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| 400 | //SetCodecOption(ENCODE_SUBSAMPLE_444 | GetCodecOption(CXIMAGE_FORMAT_JPG),CXIMAGE_FORMAT_JPG);
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| 401 |
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| 402 | // 2x2, 1x1, 1x1 (4:1:1) : High (default sub sampling)
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| 403 | cinfo.comp_info[0].h_samp_factor = 2;
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| 404 | cinfo.comp_info[0].v_samp_factor = 2;
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| 405 | cinfo.comp_info[1].h_samp_factor = 1;
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| 406 | cinfo.comp_info[1].v_samp_factor = 1;
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| 407 | cinfo.comp_info[2].h_samp_factor = 1;
|
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| 408 | cinfo.comp_info[2].v_samp_factor = 1;
|
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| 409 |
|
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| 410 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SUBSAMPLE_422) != 0){
|
|---|
| 411 | // 2x1, 1x1, 1x1 (4:2:2) : Medium
|
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| 412 | cinfo.comp_info[0].h_samp_factor = 2;
|
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| 413 | cinfo.comp_info[0].v_samp_factor = 1;
|
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| 414 | cinfo.comp_info[1].h_samp_factor = 1;
|
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| 415 | cinfo.comp_info[1].v_samp_factor = 1;
|
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| 416 | cinfo.comp_info[2].h_samp_factor = 1;
|
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| 417 | cinfo.comp_info[2].v_samp_factor = 1;
|
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| 418 | }
|
|---|
| 419 |
|
|---|
| 420 | if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SUBSAMPLE_444) != 0){
|
|---|
| 421 | // 1x1 1x1 1x1 (4:4:4) : None
|
|---|
| 422 | cinfo.comp_info[0].h_samp_factor = 1;
|
|---|
| 423 | cinfo.comp_info[0].v_samp_factor = 1;
|
|---|
| 424 | cinfo.comp_info[1].h_samp_factor = 1;
|
|---|
| 425 | cinfo.comp_info[1].v_samp_factor = 1;
|
|---|
| 426 | cinfo.comp_info[2].h_samp_factor = 1;
|
|---|
| 427 | cinfo.comp_info[2].v_samp_factor = 1;
|
|---|
| 428 | }
|
|---|
| 429 |
|
|---|
| 430 | cinfo.density_unit=1;
|
|---|
| 431 | cinfo.X_density=(unsigned short)GetXDPI();
|
|---|
| 432 | cinfo.Y_density=(unsigned short)GetYDPI();
|
|---|
| 433 |
|
|---|
| 434 | /* Step 4: Start compressor */
|
|---|
| 435 | /* TRUE ensures that we will write a complete interchange-JPEG file.
|
|---|
| 436 | * Pass TRUE unless you are very sure of what you're doing.
|
|---|
| 437 | */
|
|---|
| 438 | jpeg_start_compress(&cinfo, TRUE);
|
|---|
| 439 |
|
|---|
| 440 | /* Step 5: while (scan lines remain to be written) */
|
|---|
| 441 | /* jpeg_write_scanlines(...); */
|
|---|
| 442 | /* Here we use the library's state variable cinfo.next_scanline as the
|
|---|
| 443 | * loop counter, so that we don't have to keep track ourselves.
|
|---|
| 444 | * To keep things simple, we pass one scanline per call; you can pass
|
|---|
| 445 | * more if you wish, though.
|
|---|
| 446 | */
|
|---|
| 447 | row_stride = info.dwEffWidth; /* JSAMPLEs per row in image_buffer */
|
|---|
| 448 |
|
|---|
| 449 | //<DP> "8+row_stride" fix heap deallocation problem during debug???
|
|---|
| 450 | buffer = (*cinfo.mem->alloc_sarray)
|
|---|
| 451 | ((j_common_ptr) &cinfo, JPOOL_IMAGE, 8+row_stride, 1);
|
|---|
| 452 |
|
|---|
| 453 | CImageIterator iter(this);
|
|---|
| 454 |
|
|---|
| 455 | iter.Upset();
|
|---|
| 456 | while (cinfo.next_scanline < cinfo.image_height) {
|
|---|
| 457 | // info.nProgress = (long)(100*cinfo.next_scanline/cinfo.image_height);
|
|---|
| 458 | iter.GetRow(buffer[0], row_stride);
|
|---|
| 459 | // not necessary if swapped red and blue definition in jmorecfg.h;ln322 <W. Morrison>
|
|---|
| 460 | if (head.biClrUsed==0){ // swap R & B for RGB images
|
|---|
| 461 | RGBtoBGR(buffer[0], row_stride); // Lance : 1998/09/01 : Bug ID: EXP-2.1.1-9
|
|---|
| 462 | }
|
|---|
| 463 | iter.PrevRow();
|
|---|
| 464 | (void) jpeg_write_scanlines(&cinfo, buffer, 1);
|
|---|
| 465 | }
|
|---|
| 466 |
|
|---|
| 467 | /* Step 6: Finish compression */
|
|---|
| 468 | jpeg_finish_compress(&cinfo);
|
|---|
| 469 |
|
|---|
| 470 | /* Step 7: release JPEG compression object */
|
|---|
| 471 | /* This is an important step since it will release a good deal of memory. */
|
|---|
| 472 | jpeg_destroy_compress(&cinfo);
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | #if CXIMAGEJPG_SUPPORT_EXIF
|
|---|
| 476 | if (m_exif && m_exif->m_exifinfo->IsExif){
|
|---|
| 477 | // discard useless sections (if any) read from original image
|
|---|
| 478 | m_exif->DiscardAllButExif();
|
|---|
| 479 | // read new created image, to split the sections
|
|---|
| 480 | hFile->Seek(pos,SEEK_SET);
|
|---|
| 481 | m_exif->DecodeExif(hFile,EXIF_READ_IMAGE);
|
|---|
| 482 | // save back the image, adding EXIF section
|
|---|
| 483 | hFile->Seek(pos,SEEK_SET);
|
|---|
| 484 | m_exif->EncodeExif(hFile);
|
|---|
| 485 | }
|
|---|
| 486 | #endif
|
|---|
| 487 |
|
|---|
| 488 |
|
|---|
| 489 | /* And we're done! */
|
|---|
| 490 | return true;
|
|---|
| 491 | }
|
|---|
| 492 | ////////////////////////////////////////////////////////////////////////////////
|
|---|
| 493 | #endif // CXIMAGE_SUPPORT_ENCODE
|
|---|
| 494 | ////////////////////////////////////////////////////////////////////////////////
|
|---|
| 495 | #endif // CXIMAGE_SUPPORT_JPG
|
|---|
| 496 |
|
|---|
