1 files changed, 403 insertions, 0 deletions
diff --git a/src/3rdparty/libjpeg/src/jddiffct.c b/src/3rdparty/libjpeg/src/jddiffct.c
new file mode 100644
index 0000000000..f1d7f61b52
--- /dev/null
+++ b/src/3rdparty/libjpeg/src/jddiffct.c
@@ -0,0 +1,403 @@
+/*
+ * jddiffct.c
+ *
+ * This file was part of the Independent JPEG Group's software:
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * Lossless JPEG Modifications:
+ * Copyright (C) 1999, Ken Murchison.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2022, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
+ *
+ * This file contains the [un]difference buffer controller for decompression.
+ * This controller is the top level of the lossless JPEG decompressor proper.
+ * The difference buffer lies between the entropy decoding and
+ * prediction/undifferencing steps.  The undifference buffer lies between the
+ * prediction/undifferencing and scaling steps.
+ *
+ * In buffered-image mode, this controller is the interface between
+ * input-oriented processing and output-oriented processing.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jlossls.h"            /* Private declarations for lossless codec */
+
+
+#ifdef D_LOSSLESS_SUPPORTED
+
+/* Private buffer controller object */
+
+typedef struct {
+  struct jpeg_d_coef_controller pub; /* public fields */
+
+  /* These variables keep track of the current location of the input side. */
+  /* cinfo->input_iMCU_row is also used for this. */
+  JDIMENSION MCU_ctr;           /* counts MCUs processed in current row */
+  unsigned int restart_rows_to_go;      /* MCU rows left in this restart
+                                           interval */
+  unsigned int MCU_vert_offset;         /* counts MCU rows within iMCU row */
+  unsigned int MCU_rows_per_iMCU_row;   /* number of such rows needed */
+
+  /* The output side's location is represented by cinfo->output_iMCU_row. */
+
+  JDIFFARRAY diff_buf[MAX_COMPONENTS];  /* iMCU row of differences */
+  JDIFFARRAY undiff_buf[MAX_COMPONENTS]; /* iMCU row of undiff'd samples */
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+  /* In multi-pass modes, we need a virtual sample array for each component. */
+  jvirt_sarray_ptr whole_image[MAX_COMPONENTS];
+#endif
+} my_diff_controller;
+
+typedef my_diff_controller *my_diff_ptr;
+
+/* Forward declarations */
+METHODDEF(int) decompress_data(j_decompress_ptr cinfo, _JSAMPIMAGE output_buf);
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+METHODDEF(int) output_data(j_decompress_ptr cinfo, _JSAMPIMAGE output_buf);
+#endif
+
+
+LOCAL(void)
+start_iMCU_row(j_decompress_ptr cinfo)
+/* Reset within-iMCU-row counters for a new row (input side) */
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+
+  /* In an interleaved scan, an MCU row is the same as an iMCU row.
+   * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
+   * But at the bottom of the image, process only what's left.
+   */
+  if (cinfo->comps_in_scan > 1) {
+    diff->MCU_rows_per_iMCU_row = 1;
+  } else {
+    if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1))
+      diff->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
+    else
+      diff->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
+  }
+
+  diff->MCU_ctr = 0;
+  diff->MCU_vert_offset = 0;
+}
+
+
+/*
+ * Initialize for an input processing pass.
+ */
+
+METHODDEF(void)
+start_input_pass(j_decompress_ptr cinfo)
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+
+  /* Because it is hitching a ride on the jpeg_inverse_dct struct,
+   * start_pass_lossless() will be called at the start of the output pass.
+   * This ensures that it will be called at the start of the input pass as
+   * well.
+   */
+  (*cinfo->idct->start_pass) (cinfo);
+
+  /* Check that the restart interval is an integer multiple of the number
+   * of MCUs in an MCU row.
+   */
+  if (cinfo->restart_interval % cinfo->MCUs_per_row != 0)
+    ERREXIT2(cinfo, JERR_BAD_RESTART,
+             cinfo->restart_interval, cinfo->MCUs_per_row);
+
+  /* Initialize restart counter */
+  diff->restart_rows_to_go = cinfo->restart_interval / cinfo->MCUs_per_row;
+
+  cinfo->input_iMCU_row = 0;
+  start_iMCU_row(cinfo);
+}
+
+
+/*
+ * Check for a restart marker & resynchronize decoder, undifferencer.
+ * Returns FALSE if must suspend.
+ */
+
+METHODDEF(boolean)
+process_restart(j_decompress_ptr cinfo)
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+
+  if (!(*cinfo->entropy->process_restart) (cinfo))
+    return FALSE;
+
+  (*cinfo->idct->start_pass) (cinfo);
+
+  /* Reset restart counter */
+  diff->restart_rows_to_go = cinfo->restart_interval / cinfo->MCUs_per_row;
+
+  return TRUE;
+}
+
+
+/*
+ * Initialize for an output processing pass.
+ */
+
+METHODDEF(void)
+start_output_pass(j_decompress_ptr cinfo)
+{
+  cinfo->output_iMCU_row = 0;
+}
+
+
+/*
+ * Decompress and return some data in the supplied buffer.
+ * Always attempts to emit one fully interleaved MCU row ("iMCU" row).
+ * Input and output must run in lockstep since we have only a one-MCU buffer.
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ *
+ * NB: output_buf contains a plane for each component in image,
+ * which we index according to the component's SOF position.
+ */
+
+METHODDEF(int)
+decompress_data(j_decompress_ptr cinfo, _JSAMPIMAGE output_buf)
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+  lossless_decomp_ptr losslessd = (lossless_decomp_ptr)cinfo->idct;
+  JDIMENSION MCU_col_num;       /* index of current MCU within row */
+  JDIMENSION MCU_count;         /* number of MCUs decoded */
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  int ci, compi, row, prev_row;
+  unsigned int yoffset;
+  jpeg_component_info *compptr;
+
+  /* Loop to process as much as one whole iMCU row */
+  for (yoffset = diff->MCU_vert_offset; yoffset < diff->MCU_rows_per_iMCU_row;
+       yoffset++) {
+
+    /* Process restart marker if needed; may have to suspend */
+    if (cinfo->restart_interval) {
+      if (diff->restart_rows_to_go == 0)
+        if (!process_restart(cinfo))
+          return JPEG_SUSPENDED;
+    }
+
+    MCU_col_num = diff->MCU_ctr;
+    /* Try to fetch an MCU row (or remaining portion of suspended MCU row). */
+    MCU_count =
+      (*cinfo->entropy->decode_mcus) (cinfo,
+                                      diff->diff_buf, yoffset, MCU_col_num,
+                                      cinfo->MCUs_per_row - MCU_col_num);
+    if (MCU_count != cinfo->MCUs_per_row - MCU_col_num) {
+      /* Suspension forced; update state counters and exit */
+      diff->MCU_vert_offset = yoffset;
+      diff->MCU_ctr += MCU_count;
+      return JPEG_SUSPENDED;
+    }
+
+    /* Account for restart interval (no-op if not using restarts) */
+    if (cinfo->restart_interval)
+      diff->restart_rows_to_go--;
+
+    /* Completed an MCU row, but perhaps not an iMCU row */
+    diff->MCU_ctr = 0;
+  }
+
+  /*
+   * Undifference and scale each scanline of the disassembled MCU row
+   * separately.  We do not process dummy samples at the end of a scanline
+   * or dummy rows at the end of the image.
+   */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    compi = compptr->component_index;
+    for (row = 0, prev_row = compptr->v_samp_factor - 1;
+         row < (cinfo->input_iMCU_row == last_iMCU_row ?
+                compptr->last_row_height : compptr->v_samp_factor);
+         prev_row = row, row++) {
+      (*losslessd->predict_undifference[compi])
+        (cinfo, compi, diff->diff_buf[compi][row],
+          diff->undiff_buf[compi][prev_row], diff->undiff_buf[compi][row],
+          compptr->width_in_blocks);
+      (*losslessd->scaler_scale) (cinfo, diff->undiff_buf[compi][row],
+                                  output_buf[compi][row],
+                                  compptr->width_in_blocks);
+    }
+  }
+
+  /* Completed the iMCU row, advance counters for next one.
+   *
+   * NB: output_data will increment output_iMCU_row.
+   * This counter is not needed for the single-pass case
+   * or the input side of the multi-pass case.
+   */
+  if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) {
+    start_iMCU_row(cinfo);
+    return JPEG_ROW_COMPLETED;
+  }
+  /* Completed the scan */
+  (*cinfo->inputctl->finish_input_pass) (cinfo);
+  return JPEG_SCAN_COMPLETED;
+}
+
+
+/*
+ * Dummy consume-input routine for single-pass operation.
+ */
+
+METHODDEF(int)
+dummy_consume_data(j_decompress_ptr cinfo)
+{
+  return JPEG_SUSPENDED;        /* Always indicate nothing was done */
+}
+
+
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+
+/*
+ * Consume input data and store it in the full-image sample buffer.
+ * We read as much as one fully interleaved MCU row ("iMCU" row) per call,
+ * ie, v_samp_factor rows for each component in the scan.
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ */
+
+METHODDEF(int)
+consume_data(j_decompress_ptr cinfo)
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+  int ci, compi;
+  _JSAMPARRAY buffer[MAX_COMPS_IN_SCAN];
+  jpeg_component_info *compptr;
+
+  /* Align the virtual buffers for the components used in this scan. */
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    compi = compptr->component_index;
+    buffer[compi] = (_JSAMPARRAY)(*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, diff->whole_image[compi],
+       cinfo->input_iMCU_row * compptr->v_samp_factor,
+       (JDIMENSION)compptr->v_samp_factor, TRUE);
+  }
+
+  return decompress_data(cinfo, buffer);
+}
+
+
+/*
+ * Output some data from the full-image sample buffer in the multi-pass case.
+ * Always attempts to emit one fully interleaved MCU row ("iMCU" row).
+ * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED.
+ *
+ * NB: output_buf contains a plane for each component in image.
+ */
+
+METHODDEF(int)
+output_data(j_decompress_ptr cinfo, _JSAMPIMAGE output_buf)
+{
+  my_diff_ptr diff = (my_diff_ptr)cinfo->coef;
+  JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
+  int ci, samp_rows, row;
+  _JSAMPARRAY buffer;
+  jpeg_component_info *compptr;
+
+  /* Force some input to be done if we are getting ahead of the input. */
+  while (cinfo->input_scan_number < cinfo->output_scan_number ||
+         (cinfo->input_scan_number == cinfo->output_scan_number &&
+          cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) {
+    if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED)
+      return JPEG_SUSPENDED;
+  }
+
+  /* OK, output from the virtual arrays. */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    /* Align the virtual buffer for this component. */
+    buffer = (_JSAMPARRAY)(*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr)cinfo, diff->whole_image[ci],
+       cinfo->output_iMCU_row * compptr->v_samp_factor,
+       (JDIMENSION)compptr->v_samp_factor, FALSE);
+
+    if (cinfo->output_iMCU_row < last_iMCU_row)
+      samp_rows = compptr->v_samp_factor;
+    else {
+      /* NB: can't use last_row_height here; it is input-side-dependent! */
+      samp_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor);
+      if (samp_rows == 0) samp_rows = compptr->v_samp_factor;
+    }
+
+    for (row = 0; row < samp_rows; row++) {
+      memcpy(output_buf[ci][row], buffer[row],
+             compptr->width_in_blocks * sizeof(_JSAMPLE));
+    }
+  }
+
+  if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows)
+    return JPEG_ROW_COMPLETED;
+  return JPEG_SCAN_COMPLETED;
+}
+
+#endif /* D_MULTISCAN_FILES_SUPPORTED */
+
+
+/*
+ * Initialize difference buffer controller.
+ */
+
+GLOBAL(void)
+_jinit_d_diff_controller(j_decompress_ptr cinfo, boolean need_full_buffer)
+{
+  my_diff_ptr diff;
+  int ci;
+  jpeg_component_info *compptr;
+
+  diff = (my_diff_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
+                                sizeof(my_diff_controller));
+  cinfo->coef = (struct jpeg_d_coef_controller *)diff;
+  diff->pub.start_input_pass = start_input_pass;
+  diff->pub.start_output_pass = start_output_pass;
+
+  /* Create the [un]difference buffers. */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    diff->diff_buf[ci] =
+      ALLOC_DARRAY(JPOOL_IMAGE,
+                   (JDIMENSION)jround_up((long)compptr->width_in_blocks,
+                                         (long)compptr->h_samp_factor),
+                   (JDIMENSION)compptr->v_samp_factor);
+    diff->undiff_buf[ci] =
+      ALLOC_DARRAY(JPOOL_IMAGE,
+                   (JDIMENSION)jround_up((long)compptr->width_in_blocks,
+                                         (long)compptr->h_samp_factor),
+                   (JDIMENSION)compptr->v_samp_factor);
+  }
+
+  if (need_full_buffer) {
+#ifdef D_MULTISCAN_FILES_SUPPORTED
+    /* Allocate a full-image virtual array for each component. */
+    int access_rows;
+
+    for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+         ci++, compptr++) {
+      access_rows = compptr->v_samp_factor;
+      diff->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
+        ((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE,
+         (JDIMENSION)jround_up((long)compptr->width_in_blocks,
+                               (long)compptr->h_samp_factor),
+         (JDIMENSION)jround_up((long)compptr->height_in_blocks,
+                               (long)compptr->v_samp_factor),
+         (JDIMENSION)access_rows);
+    }
+    diff->pub.consume_data = consume_data;
+    diff->pub._decompress_data = output_data;
+#else
+    ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+  } else {
+    diff->pub.consume_data = dummy_consume_data;
+    diff->pub._decompress_data = decompress_data;
+    diff->whole_image[0] = NULL; /* flag for no virtual arrays */
+  }
+}
+
+#endif /* D_LOSSLESS_SUPPORTED */