qprintengine_qws.cpp

奇趣公司比较新的qt/emd版本

// are beyond this limit, or pad lines to reach this limit.
#define	TIFF_FAX_WIDTH			1728

static int yVal;

void QtopiaPrintEnginePrivate::writeG3FaxPage()
{
    // Pad the image file to a word boundary, just in case.
    buffer.pad();

    // Back-patch the IFD link for the previous page.
    buffer.patch( ifdPatch, buffer.size() );

    // Output the contents of the IFD for this page (these must be
    // in ascending order of tag value).
    buffer.append( (short)19 );	    // Number of IFD entries.
    writeG3IFDEntry( TIFF_IFD_NEW_SUB_FILE_TYPE, TIFF_TYPE_LONG, 1, 2 );
    writeG3IFDEntry( TIFF_IFD_IMAGE_WIDTH, TIFF_TYPE_LONG, 1, TIFF_FAX_WIDTH );
    writeG3IFDEntry
	( TIFF_IFD_IMAGE_LENGTH, TIFF_TYPE_LONG, 1, pageImage->height() );
    writeG3IFDEntry( TIFF_IFD_BITS_PER_SAMPLE, TIFF_TYPE_SHORT, 1, 1 );
    writeG3IFDEntry( TIFF_IFD_COMPRESSION, TIFF_TYPE_SHORT, 1, 3 );
    writeG3IFDEntry( TIFF_IFD_PHOTOMETRIC_INTERP, TIFF_TYPE_SHORT, 1, 0 );
    writeG3IFDEntry( TIFF_IFD_FILL_ORDER, TIFF_TYPE_SHORT, 1, 1 );
    int stripOffsets =
	writeG3IFDEntry( TIFF_IFD_STRIP_OFFSETS, TIFF_TYPE_LONG, 1, 0 );
    writeG3IFDEntry( TIFF_IFD_ORIENTATION, TIFF_TYPE_SHORT, 1, 1 );
    writeG3IFDEntry( TIFF_IFD_SAMPLES_PER_PIXEL, TIFF_TYPE_SHORT, 1, 1 );
    writeG3IFDEntry
	( TIFF_IFD_ROWS_PER_STRIP, TIFF_TYPE_LONG, 1, pageImage->height() );
    int stripBytes = writeG3IFDEntry
	( TIFF_IFD_STRIP_BYTE_COUNTS, TIFF_TYPE_LONG, 1, 0 );
    int xres =
	writeG3IFDEntry( TIFF_IFD_X_RESOLUTION, TIFF_TYPE_RATIONAL, 1, 0 );
    int yres =
	writeG3IFDEntry( TIFF_IFD_Y_RESOLUTION, TIFF_TYPE_RATIONAL, 1, 0 );
    writeG3IFDEntry( TIFF_IFD_PLANAR_CONFIG, TIFF_TYPE_SHORT, 1, 1 );
    writeG3IFDEntry( TIFF_IFD_T4_OPTIONS, TIFF_TYPE_LONG, 1, 2 );
    writeG3IFDEntry( TIFF_IFD_RESOLUTION_UNIT, TIFF_TYPE_SHORT, 1, 2 );
    writeG3IFDEntry( TIFF_IFD_PAGE_NUMBER, TIFF_TYPE_SHORT, 2,
		     TIFF_SHORT_PAIR( pageNumber, 0 ) );
    writeG3IFDEntry( TIFF_IFD_CLEAN_FAX_DATA, TIFF_TYPE_SHORT, 1, 0 );

    // Leave a place-holder for the IFD offset of the next page.
    ifdPatch = buffer.size();
    buffer.append( (int)0 );

    // Output the X and Y resolutions, as rational values (usually 200/1).
    buffer.patch( xres, buffer.size() );
    buffer.append( (int)resolution );
    buffer.append( (int)1 );
    buffer.patch( yres, buffer.size() );
    buffer.append( (int)resolution );
    buffer.append( (int)1 );

    // We are now at the start of the image data - set the strip offset.
    int start = buffer.size();
    buffer.patch( stripOffsets, start );

    // Output the image data.
    int width = pageImage->width();
    QImage::Format imageFormat = pageImage->format();
    for ( int y = 0; y < pageImage->height(); ++y ) {
        yVal = y;
	unsigned char *scan = pageImage->scanLine(y);
	int prev, pixel, len;
        writeG3EOL();
	prev = 0;
	len = 0;

        uint currentColor = qRgb(255, 255, 255); // start with white

	for ( int x = 0; x < width && x < TIFF_FAX_WIDTH; ++x ) {
            if ( imageFormat == QImage::Format_RGB32 ) {
                // read color of the current pixel
                uint *p = (uint *)scan + x;

                if ( *p == currentColor ) { // if it is the same color
                    len++; // imcrement length
                } else { // otherwise write color into the buffer
                    if ( len > 0 ) {
                        if ( currentColor == qRgb(0, 0, 0) )
                            writeG3BlackRun( len );
                        else
                            writeG3WhiteRun( len );
                    }
                    // initialise length and color;
                    len = 1;
                    currentColor = *p;
                }
            } else if ( imageFormat == QImage::Format_Mono ) {
    	        pixel = ((scan[x >> 3] & (1 << (x & 7))) != 0);
    	        if ( pixel != prev ) {
		    if ( prev ) {
		        writeG3BlackRun( len );
                    } else {
	    	        writeG3WhiteRun( len );
		    }
		    prev = pixel;
		    len = 1;
	        } else {
		    ++len;
	        }
            }
	}

        if ( imageFormat == QImage::Format_RGB32 ) {
    	    // Output the last run on the line, and pad to TIFF_FAX_WIDTH.
            if ( len != 0 ) {
                if ( currentColor == qRgb(0, 0, 0) )
                    writeG3BlackRun( len );
                else
                    writeG3WhiteRun( len );
            }
            if ( width < TIFF_FAX_WIDTH )
                writeG3WhiteRun( TIFF_FAX_WIDTH - width );
        } else if ( imageFormat == QImage::Format_Mono ) {
            if ( len != 0 ) {
	        if ( prev ) {
		    writeG3BlackRun( len );
		    if ( width < TIFF_FAX_WIDTH ) {
		        writeG3WhiteRun( TIFF_FAX_WIDTH - width );
		    }
	        } else {
		    if ( width < TIFF_FAX_WIDTH ) {
		        writeG3WhiteRun( len + ( TIFF_FAX_WIDTH - width ) );
		    } else {
		        writeG3WhiteRun( len );
		    }
	        }
	    }
        }
    }

    // Flush the last partial byte, which is padded with zero fill bits.
    if ( partialBits > 0 ) {
	buffer.append( (char)( partialByte << ( 8 - partialBits ) ) );
	partialByte = 0;
	partialBits = 0;
    }

    // end of page add six EOLs
    for ( int i = 0; i < 6; i++ )
        writeG3EOL();

    // Update the byte count for the image data strip.
    buffer.patch( stripBytes, buffer.size() - start );
}

int QtopiaPrintEnginePrivate::writeG3IFDEntry
	( int tag, int type, int count, int value )
{
    buffer.append( (short)tag );
    buffer.append( (short)type );
    buffer.append( count );
    buffer.append( value );
    return buffer.size() - 4;    // Offset of the value for back-patching.
}

void QtopiaPrintEnginePrivate::writeG3Code( int code, int bits )
{
    partialByte = ( ( partialByte << bits ) | code );
    partialBits += bits;
    while ( partialBits >= 8 ) {
	partialBits -= 8;
	buffer.append( (char)( partialByte >> partialBits ) );
    }
}

void QtopiaPrintEnginePrivate::writeG3WhiteRun( int len )
{
    static struct {
	unsigned short code;
	unsigned short bits;
    } whiteCodes[64 + 27] = {
	{0x0035, 8},		// 0
	{0x0007, 6},
	{0x0007, 4},
	{0x0008, 4},
	{0x000B, 4},
	{0x000C, 4},
	{0x000E, 4},
	{0x000F, 4},
	{0x0013, 5},		// 8
	{0x0014, 5},
	{0x0007, 5},
	{0x0008, 5},
	{0x0008, 6},
	{0x0003, 6},
	{0x0034, 6},
	{0x0035, 6},
	{0x002A, 6},		// 16
	{0x002B, 6},
	{0x0027, 7},
	{0x000C, 7},
	{0x0008, 7},
	{0x0017, 7},
	{0x0003, 7},
	{0x0004, 7},
	{0x0028, 7},		// 24
	{0x002B, 7},
	{0x0013, 7},
	{0x0024, 7},
	{0x0018, 7},
	{0x0002, 8},
	{0x0003, 8},
	{0x001A, 8},
	{0x001B, 8},		// 32
	{0x0012, 8},
	{0x0013, 8},
	{0x0014, 8},
	{0x0015, 8},
	{0x0016, 8},
	{0x0017, 8},
	{0x0028, 8},
	{0x0029, 8},		// 40
	{0x002A, 8},
	{0x002B, 8},
	{0x002C, 8},
	{0x002D, 8},
	{0x0004, 8},
	{0x0005, 8},
	{0x000A, 8},
	{0x000B, 8},		// 48
	{0x0052, 8},
	{0x0053, 8},
	{0x0054, 8},
	{0x0055, 8},
	{0x0024, 8},
	{0x0025, 8},
	{0x0058, 8},
	{0x0059, 8},		// 56
	{0x005A, 8},
	{0x005B, 8},
	{0x004A, 8},
	{0x004B, 8},
	{0x0032, 8},
	{0x0033, 8},
	{0x0034, 8},
	{0x001B, 5},		// Make up codes: 64
	{0x0012, 5},		// 128
	{0x0017, 6},		// 192
	{0x0037, 7},		// 256
	{0x0036, 8},		// 320
	{0x0037, 8},		// 384
	{0x0064, 8},		// 448
	{0x0065, 8},		// 512
	{0x0068, 8},		// 576
	{0x0067, 8},		// 640
	{0x00CC, 9},		// 704
	{0x00CD, 9},		// 768
	{0x00D2, 9},		// 832
	{0x00D3, 9},		// 896
	{0x00D4, 9},		// 960
	{0x00D5, 9},		// 1024
	{0x00D6, 9},		// 1088
	{0x00D7, 9},		// 1152
	{0x00D8, 9},		// 1216
	{0x00D9, 9},		// 1280
	{0x00DA, 9},		// 1344
	{0x00DB, 9},		// 1408
	{0x0098, 9},		// 1472
	{0x0099, 9},		// 1536
	{0x009A, 9},		// 1600
	{0x0018, 6},		// 1664
	{0x009B, 9},		// 1728
    };
    if ( len >= 64 ) {
	int index = 63 + (len >> 6);
	writeG3Code( whiteCodes[index].code, whiteCodes[index].bits );
	len &= 63;
    }
    writeG3Code( whiteCodes[len].code, whiteCodes[len].bits );
}

void QtopiaPrintEnginePrivate::writeG3BlackRun( int len )
{
    static struct {
	unsigned short code;
	unsigned short bits;
    } blackCodes[64 + 27] = {
	{0x0037, 10},		// 0
	{0x0002, 3},
	{0x0003, 2},
	{0x0002, 2},
	{0x0003, 3},
	{0x0003, 4},
	{0x0002, 4},
	{0x0003, 5},
	{0x0005, 6},		// 8
	{0x0004, 6},
	{0x0004, 7},
	{0x0005, 7},
	{0x0007, 7},
	{0x0004, 8},
	{0x0007, 8},
	{0x0018, 9},
	{0x0017, 10},		// 16
	{0x0018, 10},
	{0x0008, 10},
	{0x0067, 11},
	{0x0068, 11},
	{0x006C, 11},
	{0x0037, 11},
	{0x0028, 11},
	{0x0017, 11},		// 24
	{0x0018, 11},
	{0x00CA, 12},
	{0x00CB, 12},
	{0x00CC, 12},
	{0x00CD, 12},
	{0x0068, 12},
	{0x0069, 12},
	{0x006A, 12},		// 32
	{0x006B, 12},
	{0x00D2, 12},
	{0x00D3, 12},
	{0x00D4, 12},
	{0x00D5, 12},
	{0x00D6, 12},
	{0x00D7, 12},
	{0x006C, 12},		// 40
	{0x006D, 12},
	{0x00DA, 12},
	{0x00DB, 12},
	{0x0054, 12},
	{0x0055, 12},
	{0x0056, 12},
	{0x0057, 12},
	{0x0064, 12},		// 48
	{0x0065, 12},
	{0x0052, 12},
	{0x0053, 12},
	{0x0024, 12},
	{0x0037, 12},
	{0x0038, 12},
	{0x0027, 12},
	{0x0028, 12},		// 56
	{0x0058, 12},
	{0x0059, 12},
	{0x002B, 12},
	{0x002C, 12},
	{0x005A, 12},
	{0x0066, 12},
	{0x0067, 12},
	{0x000F, 10},		// Make up codes: 64
	{0x00C8, 12},		// 128
	{0x00C9, 12},		// 192
	{0x005B, 12},		// 256
	{0x0033, 12},		// 320
	{0x0034, 12},		// 384
	{0x0035, 12},		// 448
	{0x006C, 13},		// 512
	{0x006D, 13},		// 576
	{0x004A, 13},		// 640
	{0x004B, 13},		// 704
	{0x004C, 13},		// 768
	{0x004D, 13},		// 832
	{0x0072, 13},		// 896
	{0x0073, 13},		// 960
	{0x0074, 13},		// 1024
	{0x0075, 13},		// 1088
	{0x0076, 13},		// 1152
	{0x0077, 13},		// 1216
	{0x0052, 13},		// 1280
	{0x0053, 13},		// 1344
	{0x0054, 13},		// 1408
	{0x0055, 13},		// 1472
	{0x005A, 13},		// 1536
	{0x005B, 13},		// 1600
	{0x0064, 13},		// 1664
	{0x0065, 13},		// 1728
    };
    if ( len >= 64 ) {
	int index = 63 + (len >> 6);
	writeG3Code( blackCodes[index].code, blackCodes[index].bits );
	len &= 63;
    }
    writeG3Code( blackCodes[len].code, blackCodes[len].bits );
}

void QtopiaPrintEnginePrivate::writeG3EOL()
{
    int bitToPad;
    if ( partialBits <= 4 ) {
        bitToPad = 4 - partialBits;
    } else {
        bitToPad = 8 - partialBits + 4;
    }

    partialByte = ( ( partialByte << bitToPad + 12 ) | 0x0001 );
    partialBits += bitToPad + 12;

    while ( partialBits >= 8 ) {
        partialBits -= 8;
        buffer.append( (char)(partialByte >> partialBits ) );
    }
//    writeG3Code( 0x0001, 12 );
}

void QtopiaPrintBuffer::append( short value )
{
    if ( _bigEndian ) {
	_data.append( (char)(value >> 8) );
	_data.append( (char)value );
    } else {
	_data.append( (char)value );
	_data.append( (char)(value >> 8) );
    }
}

void QtopiaPrintBuffer::append( int value )
{
    if ( _bigEndian ) {
	_data.append( (char)(value >> 24) );
	_data.append( (char)(value >> 16) );
	_data.append( (char)(value >> 8) );
	_data.append( (char)value );
    } else {
	_data.append( (char)value );
	_data.append( (char)(value >> 8) );
	_data.append( (char)(value >> 16) );
	_data.append( (char)(value >> 24) );
    }
}

void QtopiaPrintBuffer::patch( int posn, int value )
{
    if ( _bigEndian ) {
	_data[posn]     = (char)(value >> 24);
	_data[posn + 1] = (char)(value >> 16);
	_data[posn + 2] = (char)(value >> 8);
	_data[posn + 3] = (char)value;
    } else {
        _data[posn]     = (char)value;
	_data[posn + 1] = (char)(value >> 8);
	_data[posn + 2] = (char)(value >> 16);
	_data[posn + 3] = (char)(value >> 24);
    }
}

void QtopiaPrintBuffer::pad()
{
    while ( ( _data.size() % 4 ) != 0 )
	_data.append( (char)0 );
}

#endif // QT_NO_PRINTER