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Switch to boost memory-mapped file to save RAM and potentially improve performance.

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This commit is contained in:
Maeyanie
2025-09-09 09:11:35 -04:00
parent 0896a9e686
commit bf61f94bc4
1 changed files with 50 additions and 56 deletions
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106
src/libslic3r/Format/DRC.cpp
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@@ -2,6 +2,8 @@
#include <utility>
#include <cstring>
#include <boost/iostreams/device/mapped_file.hpp>
#include <draco/compression/decode.h>
#include <draco/io/mesh_io.h>
#include <draco/mesh/mesh.h>
@@ -21,64 +23,56 @@ namespace Slic3r {
bool load_drc(const char *path, TriangleMesh *meshptr)
{
size_t size = boost::filesystem::file_size(path);
FILE *fp = boost::nowide::fopen(path, "rb");
if (fp == nullptr) {
return false;
}
char *data = new char[size];
if (fread(data, 1, size, fp) != size) {
fclose(fp);
delete[] data;
return false;
}
fclose(fp);
DecoderBuffer buffer;
buffer.Init(data, size);
auto geotype = Decoder::GetEncodedGeometryType(&buffer);
if ((!geotype.ok()) || geotype.value() != TRIANGULAR_MESH) {
delete[] data;
return false;
}
Decoder decoder;
Mesh dracoMesh;
Status status = decoder.DecodeBufferToGeometry(&buffer, &dracoMesh);
delete[] data;
if (!status.ok()) {
return false;
}
indexed_triangle_set its;
const PointAttribute *const positions = dracoMesh.GetNamedAttribute(GeometryAttribute::POSITION);
size_t num_vertices = positions->size();
its.vertices.reserve(num_vertices);
for (AttributeValueIndex i(0); i < num_vertices; ++ i) {
float pos[3];
positions->ConvertValue<float>(i, 3, pos);
its.vertices.emplace_back(pos[0], pos[1], pos[2]);
}
size_t num_faces = dracoMesh.num_faces();
its.indices.reserve(num_faces);
for (FaceIndex i(0); i < num_faces; ++ i) {
Mesh::Face face = dracoMesh.face(i);
try {
boost::iostreams::mapped_file_source file(path);
its.indices.emplace_back(
positions->mapped_index(face[0]).value(),
positions->mapped_index(face[1]).value(),
positions->mapped_index(face[2]).value()
);
}
DecoderBuffer buffer;
buffer.Init(file.data(), file.size());
*meshptr = TriangleMesh(std::move(its));
if (meshptr->volume() < 0)
meshptr->flip_triangles();
auto geotype = Decoder::GetEncodedGeometryType(&buffer);
if ((!geotype.ok()) || geotype.value() != TRIANGULAR_MESH) {
return false;
}
Decoder decoder;
Mesh dracoMesh;
Status status = decoder.DecodeBufferToGeometry(&buffer, &dracoMesh);
if (!status.ok()) {
return false;
}
file.close();
indexed_triangle_set its;
const PointAttribute *const positions = dracoMesh.GetNamedAttribute(GeometryAttribute::POSITION);
size_t num_vertices = positions->size();
its.vertices.reserve(num_vertices);
for (AttributeValueIndex i(0); i < num_vertices; ++ i) {
float pos[3];
positions->ConvertValue<float>(i, 3, pos);
its.vertices.emplace_back(pos[0], pos[1], pos[2]);
}
size_t num_faces = dracoMesh.num_faces();
its.indices.reserve(num_faces);
for (FaceIndex i(0); i < num_faces; ++ i) {
Mesh::Face face = dracoMesh.face(i);
its.indices.emplace_back(
positions->mapped_index(face[0]).value(),
positions->mapped_index(face[1]).value(),
positions->mapped_index(face[2]).value()
);
}
*meshptr = TriangleMesh(std::move(its));
if (meshptr->volume() < 0)
meshptr->flip_triangles();
} catch (const std::exception& e) {
BOOST_LOG_TRIVIAL(error) << "load_drc: " << e.what();
return false;
}
return true;
}