diff options
Diffstat (limited to 'indra/llkdu/llkdumem.cpp')
| -rw-r--r-- | indra/llkdu/llkdumem.cpp | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/indra/llkdu/llkdumem.cpp b/indra/llkdu/llkdumem.cpp new file mode 100644 index 0000000000..1f549cbbe0 --- /dev/null +++ b/indra/llkdu/llkdumem.cpp @@ -0,0 +1,196 @@ + /** + * @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; +} |