/// <summary>
/// This method loads the image into whole_image during the first call on
/// get_pixel_rows.
/// </summary>
private int preload_image()
{
cdjpeg_progress_mgr progress = cinfo.Progress as cdjpeg_progress_mgr;
/* Read the data into a virtual array in input-file row order. */
for (int row = 0; row < cinfo.Image_height; row++)
{
if (progress != null)
{
progress.Pass_counter = row;
progress.Pass_limit = cinfo.Image_height;
progress.Updated();
}
byte[][] image_ptr = whole_image.Access(row, 1);
int imageIndex = 0;
for (int col = row_width; col > 0; col--)
{
/* inline copy of read_byte() for speed */
int c = input_file.ReadByte();
if (c == -1)
{
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
}
image_ptr[0][imageIndex] = (byte)c;
imageIndex++;
}
}
if (progress != null)
{
progress.completed_extra_passes++;
}
/* Set up to read from the virtual array in top-to-bottom order */
switch (bits_per_pixel)
{
case 8:
m_pixelRowsMethod = PixelRowsMethod.use8bit;
break;
case 24:
m_pixelRowsMethod = PixelRowsMethod.use24bit;
break;
case 32:
m_pixelRowsMethod = PixelRowsMethod.use32bit;
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADDEPTH);
break;
}
source_row = cinfo.Image_height;
/* And read the first row */
return(get_pixel_rows());
}
/// <summary>
/// Finish up at the end of the file.
/// Here is where we really output the BMP file.
/// </summary>
public override void finish_output()
{
/* Write the header and colormap */
if (is_os2)
{
write_os2_header();
}
else
{
write_bmp_header();
}
cdjpeg_progress_mgr progress = cinfo.Progress as cdjpeg_progress_mgr;
/* Write the file body from our virtual array */
for (int row = cinfo.Output_height; row > 0; row--)
{
if (progress != null)
{
progress.Pass_counter = cinfo.Output_height - row;
progress.Pass_limit = cinfo.Output_height;
progress.Updated();
}
byte[][] image_ptr = whole_image.Access(row - 1, 1);
int imageIndex = 0;
for (int col = row_width; col > 0; col--)
{
output_file.WriteByte(image_ptr[0][imageIndex]);
imageIndex++;
}
}
if (progress != null)
{
progress.completed_extra_passes++;
}
/* Make sure we wrote the output file OK */
output_file.Flush();
}