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* Add read support for Google's Draco (.drc) format. * Fix build on Linux * Use boost instead of fstat. * Switch to boost memory-mapped file to save RAM and potentially improve performance. * Trim trailing whitespace. * Initial Draco write support. Currently always exports with 16-bit precision and speed 0 (best compression). The back-end function does have arguments to specify them, it's just not hooked into the GUI. * Add Draco to the About dialogue. * Fix Linux compile (hopefully) * Add an option to associate DRC files on Windows. * Implement a Preferences option to set Draco position quantization bits * Update src/slic3r/GUI/Preferences.cpp Co-authored-by: Ian Bassi <ian.bassi@outlook.com> * Some slight changes to ianalexis's suggestion. * Implement a create_item_spinctrl() function for numeric inputs, and use that instead of create_item_input(). * Move "bits" to inside the spinctrl box. * Refactor following yw4z's feedback * Update src/slic3r/GUI/Preferences.cpp Co-authored-by: Ian Bassi <ian.bassi@outlook.com> * Change to 0 bits as the default setting for Draco export precision. * Change to a lossy checkbox and a bits field with a range of 8-30. * Proper SpinInput code from yw4z * Revert "Proper SpinInput code from yw4z" This reverts commit7e9c85f31a. * Revert "Change to a lossy checkbox and a bits field with a range of 8-30." This reverts commitd642c9bcc0. * Redo preferences based on SoftFever's feedback * Refactor to minimize code duplication * Fix padding * Improve Draco export quality level tooltip clarity Clarify that 0 means lossless compression (not uncompressed), document the valid lossy range (8-30), and better explain the tradeoff between file size and geometric detail. --------- Co-authored-by: SoftFever <softfeverever@gmail.com> Co-authored-by: Noisyfox <timemanager.rick@gmail.com> Co-authored-by: Ian Bassi <ian.bassi@outlook.com>