/indra/llkdu/llkdumem.cpp
https://bitbucket.org/lindenlab/viewer-beta/ · C++ · 196 lines · 153 code · 17 blank · 26 comment · 36 complexity · 13b24353ca6ece3e718a0479a3896797 MD5 · raw file
- /**
- * @file llkdumem.cpp
- * @brief Helper class for kdu memory management
- *
- * $LicenseInfo:firstyear=2010&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
- #include "linden_common.h"
- #include "llkdumem.h"
- #include "llerror.h"
- #if defined(LL_WINDOWS)
- # pragma warning(disable: 4702) // unreachable code
- #endif
- LLKDUMemIn::LLKDUMemIn(const U8 *data,
- const U32 size,
- const U16 width,
- const U16 height,
- const U8 in_num_components,
- siz_params *siz)
- {
- U8 n;
- first_comp_idx = 0;
- rows = height;
- cols = width;
- num_components = in_num_components;
- alignment_bytes = 0;
- for (n = 0; n < 3; ++n)
- {
- precision[n] = 0;
- }
- for (n = 0; n < num_components; ++n)
- {
- siz->set(Sdims,n,0,rows);
- siz->set(Sdims,n,1,cols);
- siz->set(Ssigned,n,0,false);
- siz->set(Sprecision,n,0,8);
- }
- incomplete_lines = NULL;
- free_lines = NULL;
- num_unread_rows = rows;
- mData = data;
- mDataSize = size;
- mCurPos = 0;
- }
- LLKDUMemIn::~LLKDUMemIn()
- {
- if ((num_unread_rows > 0) || (incomplete_lines != NULL))
- {
- kdu_warning w;
- w << "Not all rows of image components "
- << first_comp_idx << " through "
- << first_comp_idx+num_components-1
- << " were consumed!";
- }
- image_line_buf *tmp;
- while ((tmp=incomplete_lines) != NULL)
- {
- incomplete_lines = tmp->next;
- delete tmp;
- }
- while ((tmp=free_lines) != NULL)
- {
- free_lines = tmp->next;
- delete tmp;
- }
- }
- bool LLKDUMemIn::get(int comp_idx, kdu_line_buf &line, int x_tnum)
- {
- int idx = comp_idx - this->first_comp_idx;
- assert((idx >= 0) && (idx < num_components));
- x_tnum = x_tnum*num_components+idx;
- image_line_buf *scan, *prev=NULL;
- for (scan = incomplete_lines; scan != NULL; prev = scan, scan = scan->next)
- {
- assert(scan->next_x_tnum >= x_tnum);
- if (scan->next_x_tnum == x_tnum)
- {
- break;
- }
- }
- if (scan == NULL)
- { // Need to read a new image line.
- assert(x_tnum == 0); // Must consume in very specific order.
- if (num_unread_rows == 0)
- {
- return false;
- }
- if ((scan = free_lines) == NULL)
- {
- scan = new image_line_buf(cols+3,num_components);
- }
- free_lines = scan->next;
- if (prev == NULL)
- {
- incomplete_lines = scan;
- }
- else
- {
- prev->next = scan;
- }
- // Copy from image buffer into scan.
- memcpy(scan->buf, mData+mCurPos, cols*num_components);
- mCurPos += cols*num_components;
- num_unread_rows--;
- scan->accessed_samples = 0;
- scan->next_x_tnum = 0;
- }
- assert((cols-scan->accessed_samples) >= line.get_width());
- int comp_offset = idx;
- kdu_byte *sp = scan->buf+num_components*scan->accessed_samples + comp_offset;
- int n=line.get_width();
- if (line.get_buf32() != NULL)
- {
- kdu_sample32 *dp = line.get_buf32();
- if (line.is_absolute())
- { // 32-bit absolute integers
- for (; n > 0; n--, sp+=num_components, dp++)
- {
- dp->ival = ((kdu_int32)(*sp)) - 128;
- }
- }
- else
- { // true 32-bit floats
- for (; n > 0; n--, sp+=num_components, dp++)
- {
- dp->fval = (((float)(*sp)) / 256.0F) - 0.5F;
- }
- }
- }
- else
- {
- kdu_sample16 *dp = line.get_buf16();
- if (line.is_absolute())
- { // 16-bit absolute integers
- for (; n > 0; n--, sp+=num_components, dp++)
- {
- dp->ival = ((kdu_int16)(*sp)) - 128;
- }
- }
- else
- { // 16-bit normalized representation.
- for (; n > 0; n--, sp+=num_components, dp++)
- {
- dp->ival = (((kdu_int16)(*sp)) - 128) << (KDU_FIX_POINT-8);
- }
- }
- }
- scan->next_x_tnum++;
- if (idx == (num_components-1))
- {
- scan->accessed_samples += line.get_width();
- }
- if (scan->accessed_samples == cols)
- { // Send empty line to free list.
- assert(scan == incomplete_lines);
- incomplete_lines = scan->next;
- scan->next = free_lines;
- free_lines = scan;
- }
- return true;
- }