Fonts: add ImFontGlyph::SourceIdx. Extract code out of DebugNodeFont() into DebugNodeFontGlyphesForSrcMask().

(src_mask unused in this commit)

imgui.cpp

@@ -16700,52 +16700,7 @@ void ImGui::DebugNodeFont(ImFont* font)
                     src_n, src->Name, src->OversampleH, oversample_h, src->OversampleV, oversample_v, src->PixelSnapH, src->GlyphOffset.x, src->GlyphOffset.y);
             }
 
-            ImDrawList* draw_list = GetWindowDrawList();
+            DebugNodeFontGlyphesForSrcMask(font, baked, ~0);
-            const ImU32 glyph_col = GetColorU32(ImGuiCol_Text);
-            const float cell_size = baked->Size * 1;
-            const float cell_spacing = GetStyle().ItemSpacing.y;
-            for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
-            {
-                // Skip ahead if a large bunch of glyphs are not present in the font (test in chunks of 4k)
-                // This is only a small optimization to reduce the number of iterations when IM_UNICODE_MAX_CODEPOINT
-                // is large // (if ImWchar==ImWchar32 we will do at least about 272 queries here)
-                if (!(base & 8191) && font->IsGlyphRangeUnused(base, base + 8191))
-                {
-                    base += 8192 - 256;
-                    continue;
-                }
-
-                int count = 0;
-                for (unsigned int n = 0; n < 256; n++)
-                    if (baked->IsGlyphLoaded((ImWchar)(base + n)))
-                        count++;
-                if (count <= 0)
-                    continue;
-                if (!TreeNode((void*)(intptr_t)base, "U+%04X..U+%04X (%d %s)", base, base + 255, count, count > 1 ? "glyphs" : "glyph"))
-                    continue;
-
-                // Draw a 16x16 grid of glyphs
-                ImVec2 base_pos = GetCursorScreenPos();
-                for (unsigned int n = 0; n < 256; n++)
-                {
-                    // We use ImFont::RenderChar as a shortcut because we don't have UTF-8 conversion functions
-                    // available here and thus cannot easily generate a zero-terminated UTF-8 encoded string.
-                    ImVec2 cell_p1(base_pos.x + (n % 16) * (cell_size + cell_spacing), base_pos.y + (n / 16) * (cell_size + cell_spacing));
-                    ImVec2 cell_p2(cell_p1.x + cell_size, cell_p1.y + cell_size);
-                    const ImFontGlyph* glyph = baked->IsGlyphLoaded((ImWchar)(base + n)) ? baked->FindGlyph((ImWchar)(base + n)) : NULL;
-                    draw_list->AddRect(cell_p1, cell_p2, glyph ? IM_COL32(255, 255, 255, 100) : IM_COL32(255, 255, 255, 50));
-                    if (!glyph)
-                        continue;
-                    font->RenderChar(draw_list, cell_size, cell_p1, glyph_col, (ImWchar)(base + n));
-                    if (IsMouseHoveringRect(cell_p1, cell_p2) && BeginTooltip())
-                    {
-                        DebugNodeFontGlyph(font, glyph);
-                        EndTooltip();
-                    }
-                }
-                Dummy(ImVec2((cell_size + cell_spacing) * 16, (cell_size + cell_spacing) * 16));
-                TreePop();
-            }
             TreePop();
         }
         PopID();
@@ -16754,6 +16709,57 @@ void ImGui::DebugNodeFont(ImFont* font)
     Unindent();
 }
 
+void ImGui::DebugNodeFontGlyphesForSrcMask(ImFont* font, ImFontBaked* baked, int src_mask)
+{
+    ImDrawList* draw_list = GetWindowDrawList();
+    const ImU32 glyph_col = GetColorU32(ImGuiCol_Text);
+    const float cell_size = baked->Size * 1;
+    const float cell_spacing = GetStyle().ItemSpacing.y;
+    for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
+    {
+        // Skip ahead if a large bunch of glyphs are not present in the font (test in chunks of 4k)
+        // This is only a small optimization to reduce the number of iterations when IM_UNICODE_MAX_CODEPOINT
+        // is large // (if ImWchar==ImWchar32 we will do at least about 272 queries here)
+        if (!(base & 8191) && font->IsGlyphRangeUnused(base, base + 8191))
+        {
+            base += 8192 - 256;
+            continue;
+        }
+
+        int count = 0;
+        for (unsigned int n = 0; n < 256; n++)
+            if (const ImFontGlyph* glyph = baked->IsGlyphLoaded((ImWchar)(base + n)) ? baked->FindGlyph((ImWchar)(base + n)) : NULL)
+                if (src_mask & (1 << glyph->SourceIdx))
+                    count++;
+        if (count <= 0)
+            continue;
+        if (!TreeNode((void*)(intptr_t)base, "U+%04X..U+%04X (%d %s)", base, base + 255, count, count > 1 ? "glyphs" : "glyph"))
+            continue;
+
+        // Draw a 16x16 grid of glyphs
+        ImVec2 base_pos = GetCursorScreenPos();
+        for (unsigned int n = 0; n < 256; n++)
+        {
+            // We use ImFont::RenderChar as a shortcut because we don't have UTF-8 conversion functions
+            // available here and thus cannot easily generate a zero-terminated UTF-8 encoded string.
+            ImVec2 cell_p1(base_pos.x + (n % 16) * (cell_size + cell_spacing), base_pos.y + (n / 16) * (cell_size + cell_spacing));
+            ImVec2 cell_p2(cell_p1.x + cell_size, cell_p1.y + cell_size);
+            const ImFontGlyph* glyph = baked->IsGlyphLoaded((ImWchar)(base + n)) ? baked->FindGlyph((ImWchar)(base + n)) : NULL;
+            draw_list->AddRect(cell_p1, cell_p2, glyph ? IM_COL32(255, 255, 255, 100) : IM_COL32(255, 255, 255, 50));
+            if (!glyph || (src_mask & (1 << glyph->SourceIdx)) == 0)
+                continue;
+            font->RenderChar(draw_list, cell_size, cell_p1, glyph_col, (ImWchar)(base + n));
+            if (IsMouseHoveringRect(cell_p1, cell_p2) && BeginTooltip())
+            {
+                DebugNodeFontGlyph(font, glyph);
+                EndTooltip();
+            }
+        }
+        Dummy(ImVec2((cell_size + cell_spacing) * 16, (cell_size + cell_spacing) * 16));
+        TreePop();
+    }
+}
+
 void ImGui::DebugNodeFontGlyph(ImFont* font, const ImFontGlyph* glyph)
 {
     Text("Codepoint: U+%04X", glyph->Codepoint);
@@ -16767,6 +16773,7 @@ void ImGui::DebugNodeFontGlyph(ImFont* font, const ImFontGlyph* glyph)
         ImTextureRect* r = ImFontAtlasPackGetRect(font->ContainerAtlas, glyph->PackId);
         Text("PackId: %d (%dx%d rect at %d,%d)", glyph->PackId, r->w, r->h, r->x, r->y);
     }
+    Text("SourceIdx: %d", glyph->SourceIdx);
 }
 
 // [DEBUG] Display contents of ImGuiStorage
@@ -17429,6 +17436,7 @@ void ImGui::DebugNodeColumns(ImGuiOldColumns*) {}
 void ImGui::DebugNodeDrawList(ImGuiWindow*, ImGuiViewportP*, const ImDrawList*, const char*) {}
 void ImGui::DebugNodeDrawCmdShowMeshAndBoundingBox(ImDrawList*, const ImDrawList*, const ImDrawCmd*, bool, bool) {}
 void ImGui::DebugNodeFont(ImFont*) {}
+void ImGui::DebugNodeFontGlyphesForSrcMask(ImFont*, ImFontBaked*, int) {}
 void ImGui::DebugNodeStorage(ImGuiStorage*, const char*) {}
 void ImGui::DebugNodeTabBar(ImGuiTabBar*, const char*) {}
 void ImGui::DebugNodeWindow(ImGuiWindow*, const char*) {}

imgui.h

@@ -3484,7 +3484,8 @@ struct ImFontGlyph
 {
     unsigned int    Colored : 1;        // Flag to indicate glyph is colored and should generally ignore tinting (make it usable with no shift on little-endian as this is used in loops)
     unsigned int    Visible : 1;        // Flag to indicate glyph has no visible pixels (e.g. space). Allow early out when rendering.
-    unsigned int    Codepoint : 30;     // 0x0000..0x10FFFF
+    unsigned int    SourceIdx : 4;      // Index of source in parent font
+    unsigned int    Codepoint : 26;     // 0x0000..0x10FFFF
     float           AdvanceX;           // Horizontal distance to advance cursor/layout position.
     float           X0, Y0, X1, Y1;     // Glyph corners. Offsets from current cursor/layout position.
     float           U0, V0, U1, V1;     // Texture coordinates for the current value of ImFontAtlas->TexRef. Cached equivalent of calling GetCustomRect() with PackId.

imgui_draw.cpp

@@ -4390,7 +4390,11 @@ static ImFontGlyph* ImFontBaked_BuildLoadGlyph(ImFontBaked* baked, ImWchar codep
         const ImFontLoader* loader = src->FontLoader ? src->FontLoader : atlas->FontLoader;
         if (!src->GlyphExcludeRanges || ImFontAtlasBuildAcceptCodepointForSource(src, codepoint))
             if (ImFontGlyph* glyph = loader->FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint))
-                return glyph; // FIXME: Add hooks for e.g. #7962
+            {
+                // FIXME: Add hooks for e.g. #7962
+                glyph->SourceIdx = src_n;
+                return glyph;
+            }
         loader_user_data_p += loader->FontBakedSrcLoaderDataSize;
     }
 

imgui_internal.h

@@ -3625,6 +3625,7 @@ namespace ImGui
     IMGUI_API void          DebugNodeDrawList(ImGuiWindow* window, ImGuiViewportP* viewport, const ImDrawList* draw_list, const char* label);
     IMGUI_API void          DebugNodeDrawCmdShowMeshAndBoundingBox(ImDrawList* out_draw_list, const ImDrawList* draw_list, const ImDrawCmd* draw_cmd, bool show_mesh, bool show_aabb);
     IMGUI_API void          DebugNodeFont(ImFont* font);
+    IMGUI_API void          DebugNodeFontGlyphesForSrcMask(ImFont* font, ImFontBaked* baked, int src_mask);
     IMGUI_API void          DebugNodeFontGlyph(ImFont* font, const ImFontGlyph* glyph);
     IMGUI_API void          DebugNodeTexture(ImTextureData* tex, int int_id, const ImFontAtlasRect* highlight_rect = NULL); // ID used to facilitate persisting the "current" texture.
     IMGUI_API void          DebugNodeStorage(ImGuiStorage* storage, const char* label);