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Viewing changes to tests/poppler/goo/JpegWriter.cc

  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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tests/poppler/goo/JpegWriter.cc
 
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//========================================================================
 
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//
 
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// JpegWriter.cc
 
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//
 
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// This file is licensed under the GPLv2 or later
 
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//
 
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// Copyright (C) 2009 Stefan Thomas <thomas@eload24.com>
 
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// Copyright (C) 2010 Adrian Johnson <ajohnson@redneon.com>
 
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// Copyright (C) 2010 Harry Roberts <harry.roberts@midnight-labs.org>
 
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//
 
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//========================================================================
 
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#include "JpegWriter.h"
 
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#ifdef ENABLE_LIBJPEG
 
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#include "poppler/Error.h"
 
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void outputMessage(j_common_ptr cinfo)
 
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{
 
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        char buffer[JMSG_LENGTH_MAX];
 
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        // Create the message
 
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        (*cinfo->err->format_message) (cinfo, buffer);
 
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        // Send it to poppler's error handler
 
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        error(-1, "%s", buffer);
 
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}
 
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JpegWriter::JpegWriter(int q, bool p)
 
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: progressive(p), quality(q)
 
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{
 
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}
 
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JpegWriter::JpegWriter()
 
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: progressive(false), quality(-1)
 
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{
 
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}
 
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JpegWriter::~JpegWriter()
 
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{
 
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        // cleanup
 
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        jpeg_destroy_compress(&cinfo);
 
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}
 
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bool JpegWriter::init(FILE *f, int width, int height, int hDPI, int vDPI)
 
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{
 
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        // Setup error handler
 
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        cinfo.err = jpeg_std_error(&jerr);
 
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        jerr.output_message = &outputMessage;
 
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        // Initialize libjpeg
 
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        jpeg_create_compress(&cinfo);
 
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        // Set destination file
 
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        jpeg_stdio_dest(&cinfo, f);
 
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        // Set libjpeg configuration
 
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        cinfo.image_width = width;
 
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        cinfo.image_height = height;
 
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        cinfo.density_unit = 1; // dots per inch
 
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        cinfo.X_density = hDPI;
 
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        cinfo.Y_density = vDPI;
 
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        cinfo.input_components = 3;     /* # of color components per pixel */
 
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        cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
 
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        jpeg_set_defaults(&cinfo);
 
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        // Set quality
 
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        if( quality >= 0 && quality <= 100 ) { 
 
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                jpeg_set_quality(&cinfo, quality, true);
 
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        }
 
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        // Use progressive mode
 
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        if( progressive) {
 
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                jpeg_simple_progression(&cinfo);
 
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        }
 
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        // Get ready for data
 
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        jpeg_start_compress(&cinfo, TRUE);
 
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        return true;
 
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}
 
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bool JpegWriter::writePointers(unsigned char **rowPointers, int rowCount)
 
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{
 
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        // Write all rows to the file
 
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        jpeg_write_scanlines(&cinfo, rowPointers, rowCount);
 
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        return true;
 
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}
 
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bool JpegWriter::writeRow(unsigned char **row)
 
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{
 
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        // Write the row to the file
 
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        jpeg_write_scanlines(&cinfo, row, 1);
 
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        return true;
 
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}
 
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bool JpegWriter::close()
 
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{
 
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        jpeg_finish_compress(&cinfo);
 
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        return true;
 
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}
 
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#endif