| public static jdiv_round_up ( long a, long b ) : long | ||
| a | long | |
| b | long | |
| return | long | |
/// <summary>
/// Do computations that are needed before processing a JPEG scan
/// cinfo.comps_in_scan and cinfo.cur_comp_info[] were set from SOS marker
/// </summary>
private void per_scan_setup()
{
if (m_cinfo.m_comps_in_scan == 1)
{
/* Noninterleaved (single-component) scan */
jpeg_component_info componentInfo = m_cinfo.Comp_info[m_cinfo.m_cur_comp_info[0]];
/* Overall image size in MCUs */
m_cinfo.m_MCUs_per_row = componentInfo.Width_in_blocks;
m_cinfo.m_MCU_rows_in_scan = componentInfo.height_in_blocks;
/* For noninterleaved scan, always one block per MCU */
componentInfo.MCU_width = 1;
componentInfo.MCU_height = 1;
componentInfo.MCU_blocks = 1;
componentInfo.MCU_sample_width = componentInfo.DCT_scaled_size;
componentInfo.last_col_width = 1;
/* For noninterleaved scans, it is convenient to define last_row_height
* as the number of block rows present in the last iMCU row.
*/
int tmp = componentInfo.height_in_blocks % componentInfo.V_samp_factor;
if (tmp == 0)
{
tmp = componentInfo.V_samp_factor;
}
componentInfo.last_row_height = tmp;
m_cinfo.Comp_info[m_cinfo.m_cur_comp_info[0]] = componentInfo;
/* Prepare array describing MCU composition */
m_cinfo.m_blocks_in_MCU = 1;
m_cinfo.m_MCU_membership[0] = 0;
}
else
{
/* Interleaved (multi-component) scan */
if (m_cinfo.m_comps_in_scan <= 0 || m_cinfo.m_comps_in_scan > JpegConstants.MAX_COMPS_IN_SCAN)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_COMPONENT_COUNT, m_cinfo.m_comps_in_scan, JpegConstants.MAX_COMPS_IN_SCAN);
}
/* Overall image size in MCUs */
m_cinfo.m_MCUs_per_row = JpegUtils.jdiv_round_up(
m_cinfo.m_image_width, m_cinfo.m_max_h_samp_factor * JpegConstants.DCTSIZE);
m_cinfo.m_MCU_rows_in_scan = JpegUtils.jdiv_round_up(
m_cinfo.m_image_height, m_cinfo.m_max_v_samp_factor * JpegConstants.DCTSIZE);
m_cinfo.m_blocks_in_MCU = 0;
for (int ci = 0; ci < m_cinfo.m_comps_in_scan; ci++)
{
jpeg_component_info componentInfo = m_cinfo.Comp_info[m_cinfo.m_cur_comp_info[ci]];
/* Sampling factors give # of blocks of component in each MCU */
componentInfo.MCU_width = componentInfo.H_samp_factor;
componentInfo.MCU_height = componentInfo.V_samp_factor;
componentInfo.MCU_blocks = componentInfo.MCU_width * componentInfo.MCU_height;
componentInfo.MCU_sample_width = componentInfo.MCU_width * componentInfo.DCT_scaled_size;
/* Figure number of non-dummy blocks in last MCU column & row */
int tmp = componentInfo.Width_in_blocks % componentInfo.MCU_width;
if (tmp == 0)
{
tmp = componentInfo.MCU_width;
}
componentInfo.last_col_width = tmp;
tmp = componentInfo.height_in_blocks % componentInfo.MCU_height;
if (tmp == 0)
{
tmp = componentInfo.MCU_height;
}
componentInfo.last_row_height = tmp;
/* Prepare array describing MCU composition */
int mcublks = componentInfo.MCU_blocks;
if (m_cinfo.m_blocks_in_MCU + mcublks > JpegConstants.D_MAX_BLOCKS_IN_MCU)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_MCU_SIZE);
}
m_cinfo.Comp_info[m_cinfo.m_cur_comp_info[ci]] = componentInfo;
while (mcublks-- > 0)
{
m_cinfo.m_MCU_membership[m_cinfo.m_blocks_in_MCU++] = ci;
}
}
}
}
/// <summary>
/// Routines to calculate various quantities related to the size of the image.
/// Called once, when first SOS marker is reached
/// </summary>
private void initial_setup()
{
/* Make sure image isn't bigger than I can handle */
if (m_cinfo.m_image_height > JpegConstants.JPEG_MAX_DIMENSION ||
m_cinfo.m_image_width > JpegConstants.JPEG_MAX_DIMENSION)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_IMAGE_TOO_BIG, (int)JpegConstants.JPEG_MAX_DIMENSION);
}
/* For now, precision must match compiled-in value... */
if (m_cinfo.m_data_precision != JpegConstants.BITS_IN_JSAMPLE)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_PRECISION, m_cinfo.m_data_precision);
}
/* Check that number of components won't exceed internal array sizes */
if (m_cinfo.m_num_components > JpegConstants.MAX_COMPONENTS)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_COMPONENT_COUNT, m_cinfo.m_num_components, JpegConstants.MAX_COMPONENTS);
}
/* Compute maximum sampling factors; check factor validity */
m_cinfo.m_max_h_samp_factor = 1;
m_cinfo.m_max_v_samp_factor = 1;
for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
{
if (m_cinfo.Comp_info[ci].H_samp_factor <= 0 || m_cinfo.Comp_info[ci].H_samp_factor > JpegConstants.MAX_SAMP_FACTOR ||
m_cinfo.Comp_info[ci].V_samp_factor <= 0 || m_cinfo.Comp_info[ci].V_samp_factor > JpegConstants.MAX_SAMP_FACTOR)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_SAMPLING);
}
m_cinfo.m_max_h_samp_factor = Math.Max(m_cinfo.m_max_h_samp_factor, m_cinfo.Comp_info[ci].H_samp_factor);
m_cinfo.m_max_v_samp_factor = Math.Max(m_cinfo.m_max_v_samp_factor, m_cinfo.Comp_info[ci].V_samp_factor);
}
/* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.
* In the full decompressor, this will be overridden jpeg_decomp_master;
* but in the transcoder, jpeg_decomp_master is not used, so we must do it here.
*/
m_cinfo.m_min_DCT_scaled_size = JpegConstants.DCTSIZE;
/* Compute dimensions of components */
for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
{
m_cinfo.Comp_info[ci].DCT_scaled_size = JpegConstants.DCTSIZE;
/* Size in DCT blocks */
m_cinfo.Comp_info[ci].Width_in_blocks = JpegUtils.jdiv_round_up(
m_cinfo.m_image_width * m_cinfo.Comp_info[ci].H_samp_factor,
m_cinfo.m_max_h_samp_factor * JpegConstants.DCTSIZE);
m_cinfo.Comp_info[ci].height_in_blocks = JpegUtils.jdiv_round_up(
m_cinfo.m_image_height * m_cinfo.Comp_info[ci].V_samp_factor,
m_cinfo.m_max_v_samp_factor * JpegConstants.DCTSIZE);
/* downsampled_width and downsampled_height will also be overridden by
* jpeg_decomp_master if we are doing full decompression. The transcoder library
* doesn't use these values, but the calling application might.
*/
/* Size in samples */
m_cinfo.Comp_info[ci].downsampled_width = JpegUtils.jdiv_round_up(
m_cinfo.m_image_width * m_cinfo.Comp_info[ci].H_samp_factor,
m_cinfo.m_max_h_samp_factor);
m_cinfo.Comp_info[ci].downsampled_height = JpegUtils.jdiv_round_up(
m_cinfo.m_image_height * m_cinfo.Comp_info[ci].V_samp_factor,
m_cinfo.m_max_v_samp_factor);
/* Mark component needed, until color conversion says otherwise */
m_cinfo.Comp_info[ci].component_needed = true;
/* Mark no quantization table yet saved for component */
m_cinfo.Comp_info[ci].quant_table = null;
}
/* Compute number of fully interleaved MCU rows. */
m_cinfo.m_total_iMCU_rows = JpegUtils.jdiv_round_up(
m_cinfo.m_image_height, m_cinfo.m_max_v_samp_factor * JpegConstants.DCTSIZE);
/* Decide whether file contains multiple scans */
if (m_cinfo.m_comps_in_scan < m_cinfo.m_num_components || m_cinfo.m_progressive_mode)
{
m_cinfo.m_inputctl.m_has_multiple_scans = true;
}
else
{
m_cinfo.m_inputctl.m_has_multiple_scans = false;
}
}
/// <summary>
/// Do computations that are needed before processing a JPEG scan
/// cinfo.comps_in_scan and cinfo.cur_comp_info[] are already set
/// </summary>
private void per_scan_setup()
{
if (m_cinfo.m_comps_in_scan == 1)
{
/* Noninterleaved (single-component) scan */
int compIndex = m_cinfo.m_cur_comp_info[0];
/* Overall image size in MCUs */
m_cinfo.m_MCUs_per_row = m_cinfo.Component_info[compIndex].Width_in_blocks;
m_cinfo.m_MCU_rows_in_scan = m_cinfo.Component_info[compIndex].height_in_blocks;
/* For noninterleaved scan, always one block per MCU */
m_cinfo.Component_info[compIndex].MCU_width = 1;
m_cinfo.Component_info[compIndex].MCU_height = 1;
m_cinfo.Component_info[compIndex].MCU_blocks = 1;
m_cinfo.Component_info[compIndex].MCU_sample_width = JpegConstants.DCTSIZE;
m_cinfo.Component_info[compIndex].last_col_width = 1;
/* For noninterleaved scans, it is convenient to define last_row_height
* as the number of block rows present in the last iMCU row.
*/
int tmp = m_cinfo.Component_info[compIndex].height_in_blocks % m_cinfo.Component_info[compIndex].V_samp_factor;
if (tmp == 0)
{
tmp = m_cinfo.Component_info[compIndex].V_samp_factor;
}
m_cinfo.Component_info[compIndex].last_row_height = tmp;
/* Prepare array describing MCU composition */
m_cinfo.m_blocks_in_MCU = 1;
m_cinfo.m_MCU_membership[0] = 0;
}
else
{
/* Interleaved (multi-component) scan */
if (m_cinfo.m_comps_in_scan <= 0 || m_cinfo.m_comps_in_scan > JpegConstants.MAX_COMPS_IN_SCAN)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_COMPONENT_COUNT, m_cinfo.m_comps_in_scan, JpegConstants.MAX_COMPS_IN_SCAN);
}
/* Overall image size in MCUs */
m_cinfo.m_MCUs_per_row = JpegUtils.jdiv_round_up(
m_cinfo.m_image_width, m_cinfo.m_max_h_samp_factor * JpegConstants.DCTSIZE);
m_cinfo.m_MCU_rows_in_scan = JpegUtils.jdiv_round_up(m_cinfo.m_image_height,
m_cinfo.m_max_v_samp_factor * JpegConstants.DCTSIZE);
m_cinfo.m_blocks_in_MCU = 0;
for (int ci = 0; ci < m_cinfo.m_comps_in_scan; ci++)
{
int compIndex = m_cinfo.m_cur_comp_info[ci];
/* Sampling factors give # of blocks of component in each MCU */
m_cinfo.Component_info[compIndex].MCU_width = m_cinfo.Component_info[compIndex].H_samp_factor;
m_cinfo.Component_info[compIndex].MCU_height = m_cinfo.Component_info[compIndex].V_samp_factor;
m_cinfo.Component_info[compIndex].MCU_blocks = m_cinfo.Component_info[compIndex].MCU_width * m_cinfo.Component_info[compIndex].MCU_height;
m_cinfo.Component_info[compIndex].MCU_sample_width = m_cinfo.Component_info[compIndex].MCU_width * JpegConstants.DCTSIZE;
/* Figure number of non-dummy blocks in last MCU column & row */
int tmp = m_cinfo.Component_info[compIndex].Width_in_blocks % m_cinfo.Component_info[compIndex].MCU_width;
if (tmp == 0)
{
tmp = m_cinfo.Component_info[compIndex].MCU_width;
}
m_cinfo.Component_info[compIndex].last_col_width = tmp;
tmp = m_cinfo.Component_info[compIndex].height_in_blocks % m_cinfo.Component_info[compIndex].MCU_height;
if (tmp == 0)
{
tmp = m_cinfo.Component_info[compIndex].MCU_height;
}
m_cinfo.Component_info[compIndex].last_row_height = tmp;
/* Prepare array describing MCU composition */
int mcublks = m_cinfo.Component_info[compIndex].MCU_blocks;
if (m_cinfo.m_blocks_in_MCU + mcublks > JpegConstants.C_MAX_BLOCKS_IN_MCU)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_MCU_SIZE);
}
while (mcublks-- > 0)
{
m_cinfo.m_MCU_membership[m_cinfo.m_blocks_in_MCU++] = ci;
}
}
}
/* Convert restart specified in rows to actual MCU count. */
/* Note that count must fit in 16 bits, so we provide limiting. */
if (m_cinfo.m_restart_in_rows > 0)
{
int nominal = m_cinfo.m_restart_in_rows * m_cinfo.m_MCUs_per_row;
m_cinfo.m_restart_interval = Math.Min(nominal, 65535);
}
}
/// <summary>
/// Routines to calculate various quantities related to the size of the image.
/// Called once, when first SOS marker is reached
/// </summary>
private void initial_setup()
{
/* Make sure image isn't bigger than I can handle */
if (m_cinfo.m_image_height > JpegConstants.JPEG_MAX_DIMENSION ||
m_cinfo.m_image_width > JpegConstants.JPEG_MAX_DIMENSION)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_IMAGE_TOO_BIG, (int)JpegConstants.JPEG_MAX_DIMENSION);
}
/* Only 8 to 12 bits data precision are supported for DCT based JPEG */
if (m_cinfo.m_data_precision < 8 || m_cinfo.m_data_precision > 12)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_PRECISION, m_cinfo.m_data_precision);
}
/* Check that number of components won't exceed internal array sizes */
if (m_cinfo.m_num_components > JpegConstants.MAX_COMPONENTS)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_COMPONENT_COUNT, m_cinfo.m_num_components, JpegConstants.MAX_COMPONENTS);
}
/* Compute maximum sampling factors; check factor validity */
m_cinfo.m_max_h_samp_factor = 1;
m_cinfo.m_max_v_samp_factor = 1;
for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
{
if (m_cinfo.Comp_info[ci].H_samp_factor <= 0 || m_cinfo.Comp_info[ci].H_samp_factor > JpegConstants.MAX_SAMP_FACTOR ||
m_cinfo.Comp_info[ci].V_samp_factor <= 0 || m_cinfo.Comp_info[ci].V_samp_factor > JpegConstants.MAX_SAMP_FACTOR)
{
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_SAMPLING);
}
m_cinfo.m_max_h_samp_factor = Math.Max(m_cinfo.m_max_h_samp_factor, m_cinfo.Comp_info[ci].H_samp_factor);
m_cinfo.m_max_v_samp_factor = Math.Max(m_cinfo.m_max_v_samp_factor, m_cinfo.Comp_info[ci].V_samp_factor);
}
/* Derive block_size, natural_order, and lim_Se */
if (m_cinfo.is_baseline || (m_cinfo.m_progressive_mode && m_cinfo.m_comps_in_scan != 0))
{
/* no pseudo SOS marker */
m_cinfo.block_size = JpegConstants.DCTSIZE;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
}
else
{
switch (m_cinfo.m_Se)
{
case (1 * 1 - 1):
m_cinfo.block_size = 1;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order; /* not needed */
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (2 * 2 - 1):
m_cinfo.block_size = 2;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order2;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (3 * 3 - 1):
m_cinfo.block_size = 3;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order3;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (4 * 4 - 1):
m_cinfo.block_size = 4;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order4;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (5 * 5 - 1):
m_cinfo.block_size = 5;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order5;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (6 * 6 - 1):
m_cinfo.block_size = 6;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order6;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (7 * 7 - 1):
m_cinfo.block_size = 7;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order7;
m_cinfo.lim_Se = m_cinfo.m_Se;
break;
case (8 * 8 - 1):
m_cinfo.block_size = 8;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (9 * 9 - 1):
m_cinfo.block_size = 9;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (10 * 10 - 1):
m_cinfo.block_size = 10;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (11 * 11 - 1):
m_cinfo.block_size = 11;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (12 * 12 - 1):
m_cinfo.block_size = 12;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (13 * 13 - 1):
m_cinfo.block_size = 13;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (14 * 14 - 1):
m_cinfo.block_size = 14;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (15 * 15 - 1):
m_cinfo.block_size = 15;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
case (16 * 16 - 1):
m_cinfo.block_size = 16;
m_cinfo.natural_order = JpegUtils.jpeg_natural_order;
m_cinfo.lim_Se = JpegConstants.DCTSIZE2 - 1;
break;
default:
m_cinfo.ERREXIT(J_MESSAGE_CODE.JERR_BAD_PROGRESSION,
m_cinfo.m_Ss, m_cinfo.m_Se, m_cinfo.m_Ah, m_cinfo.m_Al);
break;
}
}
/* We initialize DCT_scaled_size and min_DCT_scaled_size to block_size.
* In the full decompressor,
* this will be overridden by jpeg_calc_output_dimensions in jdmaster.c;
* but in the transcoder,
* jpeg_calc_output_dimensions is not used, so we must do it here.
*/
m_cinfo.min_DCT_h_scaled_size = m_cinfo.block_size;
m_cinfo.min_DCT_v_scaled_size = m_cinfo.block_size;
/* Compute dimensions of components */
for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
{
jpeg_component_info compptr = m_cinfo.Comp_info[ci];
compptr.DCT_h_scaled_size = m_cinfo.block_size;
compptr.DCT_v_scaled_size = m_cinfo.block_size;
/* Size in DCT blocks */
compptr.Width_in_blocks = (int)JpegUtils.jdiv_round_up(
m_cinfo.m_image_width * compptr.H_samp_factor,
m_cinfo.m_max_h_samp_factor * m_cinfo.block_size);
compptr.height_in_blocks = (int)JpegUtils.jdiv_round_up(
m_cinfo.m_image_height * compptr.V_samp_factor,
m_cinfo.m_max_v_samp_factor * m_cinfo.block_size);
/* downsampled_width and downsampled_height will also be overridden by
* jpeg_decomp_master if we are doing full decompression. The transcoder library
* doesn't use these values, but the calling application might.
*/
/* Size in samples */
compptr.downsampled_width = (int)JpegUtils.jdiv_round_up(
m_cinfo.m_image_width * compptr.H_samp_factor,
m_cinfo.m_max_h_samp_factor);
compptr.downsampled_height = (int)JpegUtils.jdiv_round_up(
m_cinfo.m_image_height * compptr.V_samp_factor,
m_cinfo.m_max_v_samp_factor);
/* Mark component needed, until color conversion says otherwise */
compptr.component_needed = true;
/* Mark no quantization table yet saved for component */
compptr.quant_table = null;
}
/* Compute number of fully interleaved MCU rows. */
m_cinfo.m_total_iMCU_rows = (int)JpegUtils.jdiv_round_up(
m_cinfo.m_image_height, m_cinfo.m_max_v_samp_factor * m_cinfo.block_size);
/* Decide whether file contains multiple scans */
if (m_cinfo.m_comps_in_scan < m_cinfo.m_num_components || m_cinfo.m_progressive_mode)
{
m_cinfo.m_inputctl.m_has_multiple_scans = true;
}
else
{
m_cinfo.m_inputctl.m_has_multiple_scans = false;
}
}
/*
* Compute output image dimensions and related values.
* NOTE: this is exported for possible use by application.
* Hence it mustn't do anything that can't be done twice.
*/
/* Do computations that are needed before master selection phase.
* This function is used for transcoding and full decompression.
*/
public void jpeg_core_output_dimensions()
{
/* Compute actual output image dimensions and DCT scaling choices. */
if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom)
{
/* Provide 1/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 1;
m_cinfo.min_DCT_v_scaled_size = 1;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 2)
{
/* Provide 2/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 2L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 2L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 2;
m_cinfo.min_DCT_v_scaled_size = 2;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 3)
{
/* Provide 3/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 3L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 3L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 3;
m_cinfo.min_DCT_v_scaled_size = 3;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 4)
{
/* Provide 4/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 4L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 4L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 4;
m_cinfo.min_DCT_v_scaled_size = 4;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 5)
{
/* Provide 5/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 5L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 5L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 5;
m_cinfo.min_DCT_v_scaled_size = 5;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 6)
{
/* Provide 6/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 6L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 6L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 6;
m_cinfo.min_DCT_v_scaled_size = 6;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 7)
{
/* Provide 7/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 7L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 7L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 7;
m_cinfo.min_DCT_v_scaled_size = 7;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 8)
{
/* Provide 8/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 8L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 8L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 8;
m_cinfo.min_DCT_v_scaled_size = 8;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 9)
{
/* Provide 9/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 9L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 9L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 9;
m_cinfo.min_DCT_v_scaled_size = 9;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 10)
{
/* Provide 10/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 10L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 10L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 10;
m_cinfo.min_DCT_v_scaled_size = 10;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 11)
{
/* Provide 11/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 11L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 11L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 11;
m_cinfo.min_DCT_v_scaled_size = 11;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 12)
{
/* Provide 12/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 12L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 12L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 12;
m_cinfo.min_DCT_v_scaled_size = 12;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 13)
{
/* Provide 13/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 13L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 13L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 13;
m_cinfo.min_DCT_v_scaled_size = 13;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 14)
{
/* Provide 14/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 14L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 14L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 14;
m_cinfo.min_DCT_v_scaled_size = 14;
}
else if (m_cinfo.m_scale_num * m_cinfo.block_size <= m_cinfo.m_scale_denom * 15)
{
/* Provide 15/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 15L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 15L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 15;
m_cinfo.min_DCT_v_scaled_size = 15;
}
else
{
/* Provide 16/block_size scaling */
m_cinfo.m_output_width = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_width * 16L, (long)m_cinfo.block_size);
m_cinfo.m_output_height = (int)
JpegUtils.jdiv_round_up((long)m_cinfo.m_image_height * 16L, (long)m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 16;
m_cinfo.min_DCT_v_scaled_size = 16;
}
/* Recompute dimensions of components */
for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
{
jpeg_component_info compptr = m_cinfo.Comp_info[ci];
compptr.DCT_h_scaled_size = m_cinfo.min_DCT_h_scaled_size;
compptr.DCT_v_scaled_size = m_cinfo.min_DCT_v_scaled_size;
}
}
/*
* Compute output image dimensions and related values.
* NOTE: this is exported for possible use by application.
* Hence it mustn't do anything that can't be done twice.
*/
/* Do computations that are needed before master selection phase.
* This function is used for transcoding and full decompression.
*/
public void JpegCoreOutputDimensions()
{
/* Compute actual output image dimensions and DCT scaling choices. */
if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom)
{
/* Provide 1/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 1;
m_cinfo.min_DCT_v_scaled_size = 1;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 2)
{
/* Provide 2/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 2L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 2L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 2;
m_cinfo.min_DCT_v_scaled_size = 2;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 3)
{
/* Provide 3/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 3L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 3L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 3;
m_cinfo.min_DCT_v_scaled_size = 3;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 4)
{
/* Provide 4/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 4L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 4L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 4;
m_cinfo.min_DCT_v_scaled_size = 4;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 5)
{
/* Provide 5/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 5L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 5L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 5;
m_cinfo.min_DCT_v_scaled_size = 5;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 6)
{
/* Provide 6/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 6L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 6L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 6;
m_cinfo.min_DCT_v_scaled_size = 6;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 7)
{
/* Provide 7/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 7L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 7L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 7;
m_cinfo.min_DCT_v_scaled_size = 7;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 8)
{
/* Provide 8/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 8L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 8L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 8;
m_cinfo.min_DCT_v_scaled_size = 8;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 9)
{
/* Provide 9/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 9L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 9L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 9;
m_cinfo.min_DCT_v_scaled_size = 9;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 10)
{
/* Provide 10/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 10L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 10L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 10;
m_cinfo.min_DCT_v_scaled_size = 10;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 11)
{
/* Provide 11/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 11L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 11L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 11;
m_cinfo.min_DCT_v_scaled_size = 11;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 12)
{
/* Provide 12/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 12L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 12L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 12;
m_cinfo.min_DCT_v_scaled_size = 12;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 13)
{
/* Provide 13/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 13L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 13L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 13;
m_cinfo.min_DCT_v_scaled_size = 13;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 14)
{
/* Provide 14/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 14L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 14L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 14;
m_cinfo.min_DCT_v_scaled_size = 14;
}
else if (m_cinfo.scaleNum * m_cinfo.block_size <= m_cinfo.scaleDenom * 15)
{
/* Provide 15/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 15L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 15L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 15;
m_cinfo.min_DCT_v_scaled_size = 15;
}
else
{
/* Provide 16/block_size scaling */
m_cinfo.outputWidth = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageWidth * 16L, m_cinfo.block_size);
m_cinfo.outputHeight = (int)
JpegUtils.jdiv_round_up(m_cinfo.imageHeight * 16L, m_cinfo.block_size);
m_cinfo.min_DCT_h_scaled_size = 16;
m_cinfo.min_DCT_v_scaled_size = 16;
}
/* Recompute dimensions of components */
for (var ci = 0; ci < m_cinfo.numComponents; ci++)
{
var compptr = m_cinfo.CompInfo[ci];
compptr.DCT_h_scaled_size = m_cinfo.min_DCT_h_scaled_size;
compptr.DCT_v_scaled_size = m_cinfo.min_DCT_v_scaled_size;
}
}
