/// <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>
/// Read the file header; detects image size and component count.
/// </summary>
public override void start_input()
{
byte[] bmpfileheader = new byte[14];
/* Read and verify the bitmap file header */
if (!ReadOK(input_file, bmpfileheader, 0, 14))
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
if (GET_2B(bmpfileheader, 0) != 0x4D42) /* 'BM' */
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_NOT);
int bfOffBits = GET_4B(bmpfileheader, 10);
/* We ignore the remaining fileheader fields */
/* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
* or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which.
*/
byte[] bmpinfoheader = new byte[64];
if (!ReadOK(input_file, bmpinfoheader, 0, 4))
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
int headerSize = GET_4B(bmpinfoheader, 0);
if (headerSize < 12 || headerSize> 64)
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
if (!ReadOK(input_file, bmpinfoheader, 4, headerSize - 4))
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
int biWidth = 0; /* initialize to avoid compiler warning */
int biHeight = 0;
int biPlanes;
int biCompression;
int biXPelsPerMeter;
int biYPelsPerMeter;
int biClrUsed = 0;
int mapentrysize = 0; /* 0 indicates no colormap */
switch (headerSize)
{
case 12:
/* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
biWidth = GET_2B(bmpinfoheader, 4);
biHeight = GET_2B(bmpinfoheader, 6);
biPlanes = GET_2B(bmpinfoheader, 8);
bits_per_pixel = GET_2B(bmpinfoheader, 10);
switch (bits_per_pixel)
{
case 8:
/* colormapped image */
mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_OS2_MAPPED, biWidth, biHeight);
break;
case 24:
/* RGB image */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_OS2, biWidth, biHeight);
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADDEPTH);
break;
}
if (biPlanes != 1)
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADPLANES);
break;
case 40:
case 64:
/* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
/* or OS/2 2.x header, which has additional fields that we ignore */
biWidth = GET_4B(bmpinfoheader, 4);
biHeight = GET_4B(bmpinfoheader, 8);
biPlanes = GET_2B(bmpinfoheader, 12);
bits_per_pixel = GET_2B(bmpinfoheader, 14);
biCompression = GET_4B(bmpinfoheader, 16);
biXPelsPerMeter = GET_4B(bmpinfoheader, 24);
biYPelsPerMeter = GET_4B(bmpinfoheader, 28);
biClrUsed = GET_4B(bmpinfoheader, 32);
/* biSizeImage, biClrImportant fields are ignored */
switch (bits_per_pixel)
{
case 8:
/* colormapped image */
mapentrysize = 4; /* Windows uses RGBQUAD colormap */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_MAPPED, biWidth, biHeight);
break;
case 24:
/* RGB image */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP, biWidth, biHeight);
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADDEPTH);
break;
}
if (biPlanes != 1)
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADPLANES);
if (biCompression != 0)
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_COMPRESSED);
if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0)
{
/* Set JFIF density parameters from the BMP data */
cinfo.X_density = (short)(biXPelsPerMeter / 100); /* 100 cm per meter */
cinfo.Y_density = (short)(biYPelsPerMeter / 100);
cinfo.Density_unit = DensityUnit.DotsCm;
}
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
break;
}
/* Compute distance to bitmap data --- will adjust for colormap below */
int bPad = bfOffBits - (headerSize + 14);
/* Read the colormap, if any */
if (mapentrysize > 0)
{
if (biClrUsed <= 0)
biClrUsed = 256; /* assume it's 256 */
else if (biClrUsed > 256)
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADCMAP);
/* Allocate space to store the colormap */
colormap = jpeg_common_struct.AllocJpegSamples(biClrUsed, 3);
/* and read it from the file */
read_colormap(biClrUsed, mapentrysize);
/* account for size of colormap */
bPad -= biClrUsed * mapentrysize;
}
/* Skip any remaining pad bytes */
if (bPad < 0) /* incorrect bfOffBits value? */
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
while (--bPad >= 0)
read_byte();
/* Compute row width in file, including padding to 4-byte boundary */
if (bits_per_pixel == 24)
row_width = biWidth * 3;
else
row_width = biWidth;
while ((row_width & 3) != 0)
row_width++;
/* Allocate space for inversion array, prepare for preload pass */
whole_image = jpeg_common_struct.CreateSamplesArray(row_width, biHeight);
whole_image.ErrorProcessor = cinfo;
m_pixelRowsMethod = PixelRowsMethod.preload;
if (cinfo.Progress != null)
{
cdjpeg_progress_mgr progress = cinfo.Progress as cdjpeg_progress_mgr;
if (progress != null)
{
/* count file input as separate pass */
progress.total_extra_passes++;
}
}
/* Allocate one-row buffer for returned data */
buffer = jpeg_common_struct.AllocJpegSamples(biWidth * 3, 1);
buffer_height = 1;
cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB;
cinfo.Input_components = 3;
cinfo.Data_precision = 8;
cinfo.Image_width = biWidth;
cinfo.Image_height = biHeight;
}
/// <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;
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>
/// Read the file header; detects image size and component count.
/// </summary>
public override void start_input()
{
byte[] bmpfileheader = new byte[14];
/* Read and verify the bitmap file header */
if (!ReadOK(input_file, bmpfileheader, 0, 14))
{
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
}
if (GET_2B(bmpfileheader, 0) != 0x4D42) /* 'BM' */
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_NOT);
}
int bfOffBits = GET_4B(bmpfileheader, 10);
/* We ignore the remaining fileheader fields */
/* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
* or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which.
*/
byte[] bmpinfoheader = new byte[64];
if (!ReadOK(input_file, bmpinfoheader, 0, 4))
{
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
}
int headerSize = GET_4B(bmpinfoheader, 0);
if (headerSize < 12 || headerSize > 64)
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
}
if (!ReadOK(input_file, bmpinfoheader, 4, headerSize - 4))
{
cinfo.ERREXIT(J_MESSAGE_CODE.JERR_INPUT_EOF);
}
int biWidth = 0; /* initialize to avoid compiler warning */
int biHeight = 0;
int biPlanes = 0;
int biCompression;
int biXPelsPerMeter;
int biYPelsPerMeter;
int biClrUsed = 0;
int mapentrysize = 0; /* 0 indicates no colormap */
switch (headerSize)
{
case 12:
/* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
biWidth = GET_2B(bmpinfoheader, 4);
biHeight = GET_2B(bmpinfoheader, 6);
biPlanes = GET_2B(bmpinfoheader, 8);
bits_per_pixel = GET_2B(bmpinfoheader, 10);
switch (bits_per_pixel)
{
case 8:
/* colormapped image */
mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_OS2_MAPPED, biWidth, biHeight);
break;
case 24:
/* RGB image */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_OS2, biWidth, biHeight);
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADDEPTH);
break;
}
break;
case 40:
case 64:
/* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
/* or OS/2 2.x header, which has additional fields that we ignore */
biWidth = GET_4B(bmpinfoheader, 4);
biHeight = GET_4B(bmpinfoheader, 8);
biPlanes = GET_2B(bmpinfoheader, 12);
bits_per_pixel = GET_2B(bmpinfoheader, 14);
biCompression = GET_4B(bmpinfoheader, 16);
biXPelsPerMeter = GET_4B(bmpinfoheader, 24);
biYPelsPerMeter = GET_4B(bmpinfoheader, 28);
biClrUsed = GET_4B(bmpinfoheader, 32);
/* biSizeImage, biClrImportant fields are ignored */
switch (bits_per_pixel)
{
case 8:
/* colormapped image */
mapentrysize = 4; /* Windows uses RGBQUAD colormap */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP_MAPPED, biWidth, biHeight);
break;
case 24:
/* RGB image */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP, biWidth, biHeight);
break;
case 32:
/* RGB image + Alpha channel */
cinfo.TRACEMS(1, (int)ADDON_MESSAGE_CODE.JTRC_BMP, biWidth, biHeight);
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADDEPTH);
break;
}
if (biCompression != 0)
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_COMPRESSED);
}
if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0)
{
/* Set JFIF density parameters from the BMP data */
cinfo.X_density = (short)(biXPelsPerMeter / 100); /* 100 cm per meter */
cinfo.Y_density = (short)(biYPelsPerMeter / 100);
cinfo.Density_unit = DensityUnit.DotsCm;
}
break;
default:
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
break;
}
if (biWidth <= 0 || biHeight <= 0)
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_EMPTY);
}
if (biPlanes != 1)
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADPLANES);
}
/* Compute distance to bitmap data --- will adjust for colormap below */
int bPad = bfOffBits - (headerSize + 14);
/* Read the colormap, if any */
if (mapentrysize > 0)
{
if (biClrUsed <= 0)
{
biClrUsed = 256; /* assume it's 256 */
}
else if (biClrUsed > 256)
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADCMAP);
}
/* Allocate space to store the colormap */
colormap = jpeg_common_struct.AllocJpegSamples(biClrUsed, 3);
/* and read it from the file */
read_colormap(biClrUsed, mapentrysize);
/* account for size of colormap */
bPad -= biClrUsed * mapentrysize;
}
/* Skip any remaining pad bytes */
if (bPad < 0) /* incorrect bfOffBits value? */
{
cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_BMP_BADHEADER);
}
while (--bPad >= 0)
{
read_byte();
}
/* Compute row width in file, including padding to 4-byte boundary */
if (bits_per_pixel == 24)
{
row_width = biWidth * 3;
}
else if (bits_per_pixel == 32)
{
row_width = biWidth * 4;
}
else
{
row_width = biWidth;
}
while ((row_width & 3) != 0)
{
row_width++;
}
/* Allocate space for inversion array, prepare for preload pass */
whole_image = jpeg_common_struct.CreateSamplesArray(row_width, biHeight);
whole_image.ErrorProcessor = cinfo;
m_pixelRowsMethod = PixelRowsMethod.preload;
if (cinfo.Progress != null)
{
cdjpeg_progress_mgr progress = cinfo.Progress as cdjpeg_progress_mgr;
if (progress != null)
{
/* count file input as separate pass */
progress.total_extra_passes++;
}
}
/* Allocate one-row buffer for returned data */
buffer = jpeg_common_struct.AllocJpegSamples(biWidth * 3, 1);
buffer_height = 1;
cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB;
cinfo.Input_components = 3;
cinfo.Data_precision = 8;
cinfo.Image_width = biWidth;
cinfo.Image_height = biHeight;
}