1 files changed, 91 insertions, 0 deletions
diff --git a/media-gfx/inkscape/files/inkscape-1.3.2-cxx20.patch b/media-gfx/inkscape/files/inkscape-1.3.2-cxx20.patch
new file mode 100644
index 000000000000..3c61b1919278
--- /dev/null
+++ b/media-gfx/inkscape/files/inkscape-1.3.2-cxx20.patch
@@ -0,0 +1,91 @@
+From 1798e9c13b786f3d077ba0132592c4d5c1d1fb9b Mon Sep 17 00:00:00 2001
+From: Tavmjong Bah <tavmjong@free.fr>
+Date: Tue, 26 Sep 2023 19:23:27 +0000
+Subject: [PATCH] Up C++ version to C++20.
+
+---
+ CMakeLists.txt                     | 4 ++--
+ _clang-format                      | 2 +-
+ src/ui/knot/knot-holder-entity.cpp | 2 +-
+ src/ui/tools/pencil-tool.cpp       | 9 ++++++---
+ 4 files changed, 10 insertions(+), 7 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index fe6b10cda24..de2680bd651 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,9 +18,9 @@ message("Binary Dir: ${CMAKE_CURRENT_BINARY_DIR}")
+ # -----------------------------------------------------------------------------
+ # CMake Configuration
+ # -----------------------------------------------------------------------------
+-set(CMAKE_CXX_STANDARD 17)
++set(CMAKE_CXX_STANDARD 20)
+ set(CMAKE_CXX_STANDARD_REQUIRED ON)
+-# set(CMAKE_CXX_EXTENSIONS OFF) # enforces -std=c++17 instead of -std=gnu++17
++# set(CMAKE_CXX_EXTENSIONS OFF) # enforces -std=c++20 instead of -std=gnu++20
+                                 # TODO: build currently fails with it as we actually depend on GNU compiler extensions...
+                                 #       mostly use of the non-Standard M_PI et al. TODO: C++20: Use the <numbers> header.
+ 
+diff --git a/_clang-format b/_clang-format
+index 39396fad65a..48de4d2bd88 100644
+--- a/_clang-format
++++ b/_clang-format
+@@ -103,7 +103,7 @@ SpacesInContainerLiterals: false
+ SpacesInCStyleCastParentheses: false
+ SpacesInParentheses: false
+ SpacesInSquareBrackets: false
+-Standard:        c++17
++Standard:        c++20
+ StatementMacros: []
+ TypenameMacros: []
+ TabWidth: 4
+diff --git a/src/ui/knot/knot-holder-entity.cpp b/src/ui/knot/knot-holder-entity.cpp
+index 8703f5975f7..add66d2fa29 100644
+--- a/src/ui/knot/knot-holder-entity.cpp
++++ b/src/ui/knot/knot-holder-entity.cpp
+@@ -315,7 +315,7 @@ void PatternKnotHolderEntityScale::knot_set(Geom::Point const &p, Geom::Point co
+     double scale_x = std::clamp(new_extent[X] / _cached_diagonal[X], _cached_min_scale, 1e9);
+     double scale_y = std::clamp(new_extent[Y] / _cached_diagonal[Y], _cached_min_scale, 1e9);
+ 
+-    Affine new_transform = (state & GDK_CONTROL_MASK) ? Scale(lerp(0.5, scale_x, scale_y))
++    Affine new_transform = (state & GDK_CONTROL_MASK) ? Scale((scale_x + scale_y) * 0.5)
+                                                       : Scale(scale_x, scale_y);
+ 
+     // 2. Calculate offset to keep pattern origin aligned
+diff --git a/src/ui/tools/pencil-tool.cpp b/src/ui/tools/pencil-tool.cpp
+index fd2d08cad0c..7324f7c8515 100644
+--- a/src/ui/tools/pencil-tool.cpp
++++ b/src/ui/tools/pencil-tool.cpp
+@@ -17,7 +17,11 @@
+  * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+  */
+ 
+-#include <numeric> // For std::accumulate
++#include "pencil-tool.h"
++
++#include <cmath>   // std::lerp
++#include <numeric> // std::accumulate
++
+ #include <gdk/gdkkeysyms.h>
+ #include <glibmm/i18n.h>
+ 
+@@ -26,7 +30,6 @@
+ #include <2geom/sbasis-to-bezier.h>
+ #include <2geom/svg-path-parser.h>
+ 
+-#include "pencil-tool.h"
+ 
+ #include "context-fns.h"
+ #include "desktop.h"
+@@ -806,7 +809,7 @@ void PencilTool::_addFreehandPoint(Geom::Point const &p, guint /*state*/, bool l
+             min = max;
+         }
+         double dezoomify_factor = 0.05 * 1000 / _desktop->current_zoom();
+-        double const pressure_shrunk = pressure * (max - min) + min; // C++20 -> use std::lerp()
++        double const pressure_shrunk = std::lerp(min, max, pressure);
+         double pressure_computed = std::abs(pressure_shrunk * dezoomify_factor);
+         double pressure_computed_scaled = std::abs(pressure_computed * _desktop->getDocument()->getDocumentScale().inverse()[Geom::X]);
+         if (p != p_array[_npoints - 1]) {
+-- 
+GitLab
+