(Breaking) Obsoleted style.AntiAliasedLinesUseTex which now only makes sense for legacy strokes. Added style.AntiAliasedLineEnds.

imgui.cpp

@@ -403,6 +403,7 @@ IMPLEMENTING SUPPORT for ImGuiBackendFlags_RendererHasTextures:
                           - ImDrawListFlags_AllowVtxOffset          -> ImDrawFlags_UseVtxOffset,
                           - ImDrawListFlags_TextNoPixelSnap         -> ImDrawFlags_TextNoPixelSnap,
                          unifying them allows easily using them for both per-primitives alterations and scope alterations.
+                       - obsoleted style.AntiAliasedLinesUseTex which now only makes sense for legacy strokes.
 
 (Docking/Viewport Branch)
  - 2026/XX/XX (1.XXXX) - when multi-viewports are enabled, all positions will be in your natural OS coordinates space. It means that:
@@ -1614,10 +1615,10 @@ ImGuiStyle::ImGuiStyle()
     DockingSeparatorSize        = 2.0f;             // Thickness of resizing border between docked windows
     MouseCursorScale            = 1.0f;             // Scale software rendered mouse cursor (when io.MouseDrawCursor is enabled). May be removed later.
 
-    // Rendering & Tesselation
-    AntiAliasedLines            = true;             // Enable anti-aliased lines/borders. Disable if you are really tight on CPU/GPU.
-    AntiAliasedLinesUseTex      = true;             // Enable anti-aliased lines/borders using textures where possible. Require backend to render with bilinear filtering (NOT point/nearest filtering).
-    AntiAliasedFill             = true;             // Enable anti-aliased filled shapes (rounded rectangles, circles, etc.).
+    // Rendering & Tessellation
+    AntiAliasedLines            = true;             // Enable anti-aliased lines/borders. Used at the beginning of the frame to set ImDrawFlags_AALines in all draw-lists.
+    AntiAliasedLineEnds         = false;            // Enable anti-aliased lines/borders ends. Nicer for thick lines but more expensive. Used at the beginning of the frame to set ImDrawFlags_AALineEnds in all draw-lists.
+    AntiAliasedFill             = true;             // Enable anti-aliased edges around filled shapes (rounded rectangles, circles, etc.). Used at the beginning of the frame to set ImDrawFlags_AAFill in all draw-lists.
     CurveTessellationMaxError   = 1.12f;            // Maximum error (in pixels) when using PathBezierCurveTo() without a specific number of segments. Decrease for highly tessellated curves (higher quality, more polygons), increase to reduce quality.
     CircleTessellationMaxError  = 0.30f;            // Maximum error (in pixels) allowed when using AddCircle()/AddCircleFilled() or drawing rounded corner rectangles with no explicit segment count specified. Decrease for higher quality but more geometry.
 
@@ -1633,6 +1634,7 @@ ImGuiStyle::ImGuiStyle()
     _NextFrameFontSizeBase      = 0.0f;
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     CurveTessellationTol        = 0.0f;             // Old CurveTessellationTol = CurveTessellationMaxError*CurveTessellationMaxError.
+    AntiAliasedLinesUseTex      = true;             // Enable anti-aliased lines/borders using textures for legacy strokes. Require backend to render with bilinear filtering (NOT point/nearest filtering).
 #endif
 
     // Default theme
@@ -5787,8 +5789,12 @@ static void SetupDrawListSharedData()
         g.DrawListSharedData.InitialDrawFlags |= ImDrawFlags_AAFill;
     if (g.Style.AntiAliasedLines)
         g.DrawListSharedData.InitialDrawFlags |= ImDrawFlags_AALines;
+    if (g.Style.AntiAliasedLineEnds)
+        g.DrawListSharedData.InitialDrawFlags |= ImDrawFlags_AALineEnds;
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     if (g.Style.AntiAliasedLinesUseTex && !(g.IO.Fonts->Flags & ImFontAtlasFlags_NoBakedLines))
         g.DrawListSharedData.InitialDrawFlags |= ImDrawFlags_UseTexForStrokeLegacy;
+#endif
     if (!(g.IO.Fonts->Flags & ImFontAtlasFlags_NoBakedRoundCorners))
         g.DrawListSharedData.InitialDrawFlags |= ImDrawFlags_UseTexForRoundCorners;
     if (g.IO.BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset)

imgui.h

@@ -2461,10 +2461,10 @@ struct ImGuiStyle
     float       DockingSeparatorSize;       // Thickness of resizing border between docked windows
     float       MouseCursorScale;           // Scale software rendered mouse cursor (when io.MouseDrawCursor is enabled). We apply per-monitor DPI scaling over this scale. May be removed later.
 
-    // Rendering & Tesselation
-    bool        AntiAliasedLines;           // Enable anti-aliased lines/borders. Disable if you are really tight on CPU/GPU. Latched at the beginning of the frame (copied to ImDrawList).
-    bool        AntiAliasedLinesUseTex;     // Enable anti-aliased lines/borders using textures where possible. Require backend to render with bilinear filtering (NOT point/nearest filtering). Latched at the beginning of the frame (copied to ImDrawList).
-    bool        AntiAliasedFill;            // Enable anti-aliased edges around filled shapes (rounded rectangles, circles, etc.). Disable if you are really tight on CPU/GPU. Latched at the beginning of the frame (copied to ImDrawList).
+    // Rendering & Tessellation
+    bool        AntiAliasedLines;           // Enable anti-aliased lines/borders. Disable if you are really tight on CPU/GPU. Latched at the beginning of the frame (copied to ImDrawList).    bool        AntiAliasedLines;           // Enable anti-aliased lines/borders. Used at the beginning of the frame to set ImDrawFlags_AALines in all draw-lists.
+    bool        AntiAliasedLineEnds;        // Enable anti-aliased lines/borders ends. Nicer for thick lines but more expensive. Used at the beginning of the frame to set ImDrawFlags_AALineEnds in all draw-lists.
+    bool        AntiAliasedFill;            // Enable anti-aliased edges around filled shapes (rounded rectangles, circles, etc.). Used at the beginning of the frame to set ImDrawFlags_AAFill in all draw-lists.
     float       CurveTessellationMaxError;  // Maximum error (in pixels) when using PathBezierCurveTo() without a specific number of segments. Decrease for highly tessellated curves (higher quality, more polygons), increase to reduce quality.
     float       CircleTessellationMaxError; // Maximum error (in pixels) allowed when using AddCircle()/AddCircleFilled() or drawing rounded corner rectangles with no explicit segment count specified. Decrease for higher quality but more geometry.
 
@@ -2489,6 +2489,7 @@ struct ImGuiStyle
 
     // Obsolete names
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    bool        AntiAliasedLinesUseTex;     // [OBSOLETE] Enable anti-aliased lines/borders using textures for legacy strokes. Require backend to render with bilinear filtering (NOT point/nearest filtering). Latched at the beginning of the frame (copied to ImDrawList).
     float       CurveTessellationTol;       // [OBSOLETE] Old CurveTessellationTol = New CurveTessellationMaxError*CurveTessellationMaxError. // Changed in 1.93.0
     // TabMinWidthForCloseButton = TabCloseButtonMinWidthUnselected // Renamed in 1.91.9.
 #endif
@@ -3992,7 +3993,7 @@ struct ImFontAtlas
     // Input
     ImFontAtlasFlags            Flags;              // Build flags (see ImFontAtlasFlags_)
     ImTextureFormat             TexDesiredFormat;   // Desired texture format (default to ImTextureFormat_RGBA32 but may be changed to ImTextureFormat_Alpha8).
-    int                         TexGlyphPadding;    // FIXME: Should be called "TexPackPadding". Padding between glyphs within texture in pixels. Defaults to 1. If your rendering method doesn't rely on bilinear filtering you may set this to 0 (will also need to set AntiAliasedLinesUseTex = false).
+    int                         TexGlyphPadding;    // FIXME: Should be called "TexPackPadding". Padding between glyphs within texture in pixels. Defaults to 1. If your rendering method never relies on bilinear filtering you may set this to 0.
     int                         TexMinWidth;        // Minimum desired texture width. Must be a power of two. Default to 512.
     int                         TexMinHeight;       // Minimum desired texture height. Must be a power of two. Default to 128.
     int                         TexMaxWidth;        // Maximum desired texture width. Must be a power of two. Default to 8192.

imgui_demo.cpp

@@ -8936,9 +8936,15 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             SameLine();
             HelpMarker("When disabling anti-aliasing lines, you'll probably want to disable borders in your style as well.");
 
+            Checkbox("Anti-aliased line ends", &style.AntiAliasedLineEnds);
+
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+            BeginDisabled();
             Checkbox("Anti-aliased lines use texture", &style.AntiAliasedLinesUseTex);
             SameLine();
             HelpMarker("Faster lines using texture data. Require backend to render with bilinear filtering (not point/nearest filtering).");
+            EndDisabled();
+#endif
 
             Checkbox("Anti-aliased fill", &style.AntiAliasedFill);
             PushItemWidth(GetFontSize() * 8);