[Scummvm-git-logs] scummvm master -> fea92ca5d78eaac3204f4327626af449ff6e4e4d

sev- noreply at scummvm.org
Sat Feb 14 23:07:12 UTC 2026


This automated email contains information about 2 new commits which have been
pushed to the 'scummvm' repo located at https://api.github.com/repos/scummvm/scummvm .

Summary:
42e2126ae8 BACKENDS: IMGUI: Move MemoryEditor component away from Director engine
fea92ca5d7 BACKENDS: IMGUI: Update MemoryEditor component to v0.59


Commit: 42e2126ae8b26c55bbf84002827d79a1c3718a01
    https://github.com/scummvm/scummvm/commit/42e2126ae8b26c55bbf84002827d79a1c3718a01
Author: Sebastien Ronsse (sronsse at gmail.com)
Date: 2026-02-15T00:07:07+01:00

Commit Message:
BACKENDS: IMGUI: Move MemoryEditor component away from Director engine

Changed paths:
  A backends/imgui/components/imgui_memory_editor.h
  R engines/director/debugger/imgui_memory_editor.h
    engines/director/debugger/dt-internal.h


diff --git a/engines/director/debugger/imgui_memory_editor.h b/backends/imgui/components/imgui_memory_editor.h
similarity index 100%
rename from engines/director/debugger/imgui_memory_editor.h
rename to backends/imgui/components/imgui_memory_editor.h
diff --git a/engines/director/debugger/dt-internal.h b/engines/director/debugger/dt-internal.h
index 84b31699530..9caab66fb13 100644
--- a/engines/director/debugger/dt-internal.h
+++ b/engines/director/debugger/dt-internal.h
@@ -31,8 +31,7 @@
 #include "backends/imgui/imgui.h"
 #include "backends/imgui/imgui_fonts.h"
 #include "backends/imgui/components/imgui_logger.h"
-
-#include "director/debugger/imgui_memory_editor.h"
+#include "backends/imgui/components/imgui_memory_editor.h"
 
 #include "director/types.h"
 #include "director/lingo/lingo.h"


Commit: fea92ca5d78eaac3204f4327626af449ff6e4e4d
    https://github.com/scummvm/scummvm/commit/fea92ca5d78eaac3204f4327626af449ff6e4e4d
Author: Sebastien Ronsse (sronsse at gmail.com)
Date: 2026-02-15T00:07:07+01:00

Commit Message:
BACKENDS: IMGUI: Update MemoryEditor component to v0.59

Imported from https://github.com/ocornut/imgui_club
commit hash 019ed6171a5b46448eb8a2c8e7e8a1d792c722fd

Changed paths:
    backends/imgui/components/imgui_memory_editor.h


diff --git a/backends/imgui/components/imgui_memory_editor.h b/backends/imgui/components/imgui_memory_editor.h
index 0c37f1a9d23..ebe491b7a5a 100644
--- a/backends/imgui/components/imgui_memory_editor.h
+++ b/backends/imgui/components/imgui_memory_editor.h
@@ -1,6 +1,7 @@
 // Mini memory editor for Dear ImGui (to embed in your game/tools)
 // Get latest version at http://www.github.com/ocornut/imgui_club
-//
+// Licensed under The MIT License (MIT)
+
 // Right-click anywhere to access the Options menu!
 // You can adjust the keyboard repeat delay/rate in ImGuiIO.
 // The code assume a mono-space font for simplicity!
@@ -41,8 +42,18 @@
 // - v0.50 (2021/11/12): various fixes for recent dear imgui versions (fixed misuse of clipper, relying on SetKeyboardFocusHere() handling scrolling from 1.85). added default size.
 // - v0.51 (2024/02/22): fix for layout change in 1.89 when using IMGUI_DISABLE_OBSOLETE_FUNCTIONS. (#34)
 // - v0.52 (2024/03/08): removed unnecessary GetKeyIndex() calls, they are a no-op since 1.87.
+// - v0.53 (2024/05/27): fixed right-click popup from not appearing when using DrawContents(). warning fixes. (#35)
+// - v0.54 (2024/07/29): allow ReadOnly mode to still select and preview data. (#46) [@DeltaGW2])
+// - v0.55 (2024/08/19): added BgColorFn to allow setting background colors independently from highlighted selection. (#27) [@StrikerX3]
+//                       added MouseHoveredAddr public readable field. (#47, #27) [@StrikerX3]
+//                       fixed a data preview crash with 1.91.0 WIP. fixed contiguous highlight color when using data preview.
+//                       *BREAKING* added UserData field passed to all optional function handlers: ReadFn, WriteFn, HighlightFn, BgColorFn. (#50) [@silverweed]
+// - v0.56 (2024/11/04): fixed MouseHovered, MouseHoveredAddr not being set when hovering a byte being edited. (#54)
+// - v0.57 (2025/03/26): fixed warnings. using ImGui's ImSXX/ImUXX types instead of e.g. int32_t/uint32_t. (#56)
+// - v0.58 (2025/03/31): fixed extraneous footer spacing (added in 0.51) breaking vertical auto-resize. (#53)
+// - v0.59 (2025/04/08): fixed GotoAddrAndHighlight() not working if OptShowOptions is disabled.
 //
-// Todo/Bugs:
+// TODO:
 // - This is generally old/crappy code, it should work but isn't very good.. to be rewritten some day.
 // - PageUp/PageDown are not supported because we use _NoNav. This is a good test scenario for working out idioms of how to mix natural nav and our own...
 // - Arrows are being sent to the InputText() about to disappear which for LeftArrow makes the text cursor appear at position 1 for one frame.
@@ -53,13 +64,18 @@
 #include <stdio.h>      // sprintf, scanf
 #include <stdint.h>     // uint8_t, etc.
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(snprintf)
 #define ImSnprintf  _snprintf
 #else
 #define ImSnprintf  snprintf
 #endif
+#if defined(_MSC_VER) && !defined(__clang__)
+#define _PRISizeT   "I"
+#else
+#define _PRISizeT   "z"
+#endif
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || defined(_UCRT)
 #pragma warning (push)
 #pragma warning (disable: 4996) // warning C4996: 'sprintf': This function or variable may be unsafe.
 #endif
@@ -88,9 +104,17 @@ struct MemoryEditor
     int             OptAddrDigitsCount;                         // = 0      // number of addr digits to display (default calculated based on maximum displayed addr).
     float           OptFooterExtraHeight;                       // = 0      // space to reserve at the bottom of the widget to add custom widgets
     ImU32           HighlightColor;                             //          // background color of highlighted bytes.
-    ImU8            (*ReadFn)(const ImU8* data, size_t off);    // = 0      // optional handler to read bytes.
-    void            (*WriteFn)(ImU8* data, size_t off, ImU8 d); // = 0      // optional handler to write bytes.
-    bool            (*HighlightFn)(const ImU8* data, size_t off);//= 0      // optional handler to return Highlight property (to support non-contiguous highlighting).
+
+    // Function handlers
+    ImU8            (*ReadFn)(const ImU8* mem, size_t off, void* user_data);      // = 0      // optional handler to read bytes.
+    void            (*WriteFn)(ImU8* mem, size_t off, ImU8 d, void* user_data);   // = 0      // optional handler to write bytes.
+    bool            (*HighlightFn)(const ImU8* mem, size_t off, void* user_data); // = 0      // optional handler to return Highlight property (to support non-contiguous highlighting).
+    ImU32           (*BgColorFn)(const ImU8* mem, size_t off, void* user_data);   // = 0      // optional handler to return custom background color of individual bytes.
+    void*           UserData;                                                     // = NULL   // user data forwarded to the function handlers
+
+    // Public read-only data
+    bool            MouseHovered;                               // set when mouse is hovering a value.
+    size_t          MouseHoveredAddr;                           // the address currently being hovered if MouseHovered is set.
 
     // [Internal State]
     bool            ContentsWidthChanged;
@@ -120,9 +144,11 @@ struct MemoryEditor
         OptAddrDigitsCount = 0;
         OptFooterExtraHeight = 0.0f;
         HighlightColor = IM_COL32(255, 255, 255, 50);
-        ReadFn = NULL;
-        WriteFn = NULL;
-        HighlightFn = NULL;
+        ReadFn = nullptr;
+        WriteFn = nullptr;
+        HighlightFn = nullptr;
+        BgColorFn = nullptr;
+        UserData = nullptr;
 
         // State/Internals
         ContentsWidthChanged = false;
@@ -131,6 +157,8 @@ struct MemoryEditor
         memset(DataInputBuf, 0, sizeof(DataInputBuf));
         memset(AddrInputBuf, 0, sizeof(AddrInputBuf));
         GotoAddr = (size_t)-1;
+        MouseHovered = false;
+        MouseHoveredAddr = 0;
         HighlightMin = HighlightMax = (size_t)-1;
         PreviewEndianness = 0;
         PreviewDataType = ImGuiDataType_S32;
@@ -145,16 +173,16 @@ struct MemoryEditor
 
     struct Sizes
     {
-        int     AddrDigitsCount;
-        float   LineHeight;
-        float   GlyphWidth;
-        float   HexCellWidth;
-        float   SpacingBetweenMidCols;
-        float   PosHexStart;
-        float   PosHexEnd;
-        float   PosAsciiStart;
-        float   PosAsciiEnd;
-        float   WindowWidth;
+        int     AddrDigitsCount;            // Number of digits required to represent maximum address.
+        float   LineHeight;                 // Height of each line (no spacing).
+        float   GlyphWidth;                 // Glyph width (assume mono-space).
+        float   HexCellWidth;               // Width of a hex edit cell ~2.5f * GlypHWidth.
+        float   SpacingBetweenMidCols;      // Spacing between each columns section (OptMidColsCount).
+        float   OffsetHexMinX;
+        float   OffsetHexMaxX;
+        float   OffsetAsciiMinX;
+        float   OffsetAsciiMaxX;
+        float   WindowWidth;                // Ideal window width.
 
         Sizes() { memset(this, 0, sizeof(*this)); }
     };
@@ -170,17 +198,17 @@ struct MemoryEditor
         s.GlyphWidth = ImGui::CalcTextSize("F").x + 1;                  // We assume the font is mono-space
         s.HexCellWidth = (float)(int)(s.GlyphWidth * 2.5f);             // "FF " we include trailing space in the width to easily catch clicks everywhere
         s.SpacingBetweenMidCols = (float)(int)(s.HexCellWidth * 0.25f); // Every OptMidColsCount columns we add a bit of extra spacing
-        s.PosHexStart = (s.AddrDigitsCount + 2) * s.GlyphWidth;
-        s.PosHexEnd = s.PosHexStart + (s.HexCellWidth * Cols);
-        s.PosAsciiStart = s.PosAsciiEnd = s.PosHexEnd;
+        s.OffsetHexMinX = (s.AddrDigitsCount + 2) * s.GlyphWidth;
+        s.OffsetHexMaxX = s.OffsetHexMinX + (s.HexCellWidth * Cols);
+        s.OffsetAsciiMinX = s.OffsetAsciiMaxX = s.OffsetHexMaxX;
         if (OptShowAscii)
         {
-            s.PosAsciiStart = s.PosHexEnd + s.GlyphWidth * 1;
+            s.OffsetAsciiMinX = s.OffsetHexMaxX + s.GlyphWidth * 1;
             if (OptMidColsCount > 0)
-                s.PosAsciiStart += (float)((Cols + OptMidColsCount - 1) / OptMidColsCount) * s.SpacingBetweenMidCols;
-            s.PosAsciiEnd = s.PosAsciiStart + Cols * s.GlyphWidth;
+                s.OffsetAsciiMinX += (float)((Cols + OptMidColsCount - 1) / OptMidColsCount) * s.SpacingBetweenMidCols;
+            s.OffsetAsciiMaxX = s.OffsetAsciiMinX + Cols * s.GlyphWidth;
         }
-        s.WindowWidth = s.PosAsciiEnd + style.ScrollbarSize + style.WindowPadding.x * 2 + s.GlyphWidth;
+        s.WindowWidth = s.OffsetAsciiMaxX + style.ScrollbarSize + style.WindowPadding.x * 2 + s.GlyphWidth;
     }
 
     // Standalone Memory Editor window
@@ -194,8 +222,6 @@ struct MemoryEditor
         Open = true;
         if (ImGui::Begin(title, &Open, ImGuiWindowFlags_NoScrollbar))
         {
-            if (ImGui::IsWindowHovered(ImGuiHoveredFlags_RootAndChildWindows) && ImGui::IsMouseReleased(ImGuiMouseButton_Right))
-                ImGui::OpenPopup("context");
             DrawContents(mem_data, mem_size, base_display_addr);
             if (ContentsWidthChanged)
             {
@@ -217,6 +243,8 @@ struct MemoryEditor
         CalcSizes(s, mem_size, base_display_addr);
         ImGuiStyle& style = ImGui::GetStyle();
 
+        const ImVec2 contents_pos_start = ImGui::GetCursorScreenPos();
+
         // We begin into our scrolling region with the 'ImGuiWindowFlags_NoMove' in order to prevent click from moving the window.
         // This is used as a facility since our main click detection code doesn't assign an ActiveId so the click would normally be caught as a window-move.
         const float height_separator = style.ItemSpacing.y;
@@ -225,20 +253,21 @@ struct MemoryEditor
             footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1;
         if (OptShowDataPreview)
             footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1 + ImGui::GetTextLineHeightWithSpacing() * 3;
-        ImGui::BeginChild("##scrolling", ImVec2(0, -footer_height), false, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoNav);
+        ImGui::BeginChild("##scrolling", ImVec2(-FLT_MIN, -footer_height), ImGuiChildFlags_None, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoNav);
         ImDrawList* draw_list = ImGui::GetWindowDrawList();
 
         ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
         ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
 
         // We are not really using the clipper API correctly here, because we rely on visible_start_addr/visible_end_addr for our scrolling function.
+        const ImVec2 avail_size = ImGui::GetContentRegionAvail();
         const int line_total_count = (int)((mem_size + Cols - 1) / Cols);
         ImGuiListClipper clipper;
         clipper.Begin(line_total_count, s.LineHeight);
 
         bool data_next = false;
 
-        if (ReadOnly || DataEditingAddr >= mem_size)
+        if (DataEditingAddr >= mem_size)
             DataEditingAddr = (size_t)-1;
         if (DataPreviewAddr >= mem_size)
             DataPreviewAddr = (size_t)-1;
@@ -258,46 +287,61 @@ struct MemoryEditor
         // Draw vertical separator
         ImVec2 window_pos = ImGui::GetWindowPos();
         if (OptShowAscii)
-            draw_list->AddLine(ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y), ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y + 9999), ImGui::GetColorU32(ImGuiCol_Border));
+            draw_list->AddLine(ImVec2(window_pos.x + s.OffsetAsciiMinX - s.GlyphWidth, window_pos.y), ImVec2(window_pos.x + s.OffsetAsciiMinX - s.GlyphWidth, window_pos.y + 9999), ImGui::GetColorU32(ImGuiCol_Border));
 
         const ImU32 color_text = ImGui::GetColorU32(ImGuiCol_Text);
         const ImU32 color_disabled = OptGreyOutZeroes ? ImGui::GetColorU32(ImGuiCol_TextDisabled) : color_text;
 
-        const char* format_address = OptUpperCaseHex ? "%0*zX: " : "%0*zx: ";
-        const char* format_data = OptUpperCaseHex ? "%0*zX" : "%0*zx";
+        const char* format_address = OptUpperCaseHex ? "%0*" _PRISizeT "X: " : "%0*" _PRISizeT "x: ";
+        const char* format_data = OptUpperCaseHex ? "%0*" _PRISizeT "X" : "%0*" _PRISizeT "x";
         const char* format_byte = OptUpperCaseHex ? "%02X" : "%02x";
         const char* format_byte_space = OptUpperCaseHex ? "%02X " : "%02x ";
 
+        MouseHovered = false;
+        MouseHoveredAddr = 0;
+
         while (clipper.Step())
             for (int line_i = clipper.DisplayStart; line_i < clipper.DisplayEnd; line_i++) // display only visible lines
             {
-                size_t addr = (size_t)(line_i * Cols);
+                size_t addr = (size_t)line_i * Cols;
                 ImGui::Text(format_address, s.AddrDigitsCount, base_display_addr + addr);
 
                 // Draw Hexadecimal
                 for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
                 {
-                    float byte_pos_x = s.PosHexStart + s.HexCellWidth * n;
+                    float byte_pos_x = s.OffsetHexMinX + s.HexCellWidth * n;
                     if (OptMidColsCount > 0)
                         byte_pos_x += (float)(n / OptMidColsCount) * s.SpacingBetweenMidCols;
                     ImGui::SameLine(byte_pos_x);
 
-                    // Draw highlight
-                    bool is_highlight_from_user_range = (addr >= HighlightMin && addr < HighlightMax);
-                    bool is_highlight_from_user_func = (HighlightFn && HighlightFn(mem_data, addr));
-                    bool is_highlight_from_preview = (addr >= DataPreviewAddr && addr < DataPreviewAddr + preview_data_type_size);
+                    // Draw highlight or custom background color
+                    const bool is_highlight_from_user_range = (addr >= HighlightMin && addr < HighlightMax);
+                    const bool is_highlight_from_user_func = (HighlightFn && HighlightFn(mem_data, addr, UserData));
+                    const bool is_highlight_from_preview = (addr >= DataPreviewAddr && addr < DataPreviewAddr + preview_data_type_size);
+
+                    ImU32 bg_color = 0;
+                    bool is_next_byte_highlighted = false;
                     if (is_highlight_from_user_range || is_highlight_from_user_func || is_highlight_from_preview)
                     {
-                        ImVec2 pos = ImGui::GetCursorScreenPos();
-                        float highlight_width = s.GlyphWidth * 2;
-                        bool is_next_byte_highlighted = (addr + 1 < mem_size) && ((HighlightMax != (size_t)-1 && addr + 1 < HighlightMax) || (HighlightFn && HighlightFn(mem_data, addr + 1)));
+                        is_next_byte_highlighted = (addr + 1 < mem_size) && ((HighlightMax != (size_t)-1 && addr + 1 < HighlightMax) || (HighlightFn && HighlightFn(mem_data, addr + 1, UserData)) || (addr + 1 < DataPreviewAddr + preview_data_type_size));
+                        bg_color = HighlightColor;
+                    }
+                    else if (BgColorFn != nullptr)
+                    {
+                        is_next_byte_highlighted = (addr + 1 < mem_size) && ((BgColorFn(mem_data, addr + 1, UserData) & IM_COL32_A_MASK) != 0);
+                        bg_color = BgColorFn(mem_data, addr, UserData);
+                    }
+                    if (bg_color != 0)
+                    {
+                        float bg_width = s.GlyphWidth * 2;
                         if (is_next_byte_highlighted || (n + 1 == Cols))
                         {
-                            highlight_width = s.HexCellWidth;
+                            bg_width = s.HexCellWidth;
                             if (OptMidColsCount > 0 && n > 0 && (n + 1) < Cols && ((n + 1) % OptMidColsCount) == 0)
-                                highlight_width += s.SpacingBetweenMidCols;
+                                bg_width += s.SpacingBetweenMidCols;
                         }
-                        draw_list->AddRectFilled(pos, ImVec2(pos.x + highlight_width, pos.y + s.LineHeight), HighlightColor);
+                        ImVec2 pos = ImGui::GetCursorScreenPos();
+                        draw_list->AddRectFilled(pos, ImVec2(pos.x + bg_width, pos.y + s.LineHeight), bg_color);
                     }
 
                     if (DataEditingAddr == addr)
@@ -308,17 +352,21 @@ struct MemoryEditor
                         if (DataEditingTakeFocus)
                         {
                             ImGui::SetKeyboardFocusHere(0);
-                            snprintf(AddrInputBuf, 32, format_data, s.AddrDigitsCount, base_display_addr + addr);
-                            snprintf(DataInputBuf, 32, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
+                            ImSnprintf(AddrInputBuf, 32, format_data, s.AddrDigitsCount, base_display_addr + addr);
+                            ImSnprintf(DataInputBuf, 32, format_byte, ReadFn ? ReadFn(mem_data, addr, UserData) : mem_data[addr]);
                         }
-                        struct UserData
+                        struct InputTextUserData
                         {
                             // FIXME: We should have a way to retrieve the text edit cursor position more easily in the API, this is rather tedious. This is such a ugly mess we may be better off not using InputText() at all here.
                             static int Callback(ImGuiInputTextCallbackData* data)
                             {
-                                UserData* user_data = (UserData*)data->UserData;
+                                InputTextUserData* user_data = (InputTextUserData*)data->UserData;
                                 if (!data->HasSelection())
                                     user_data->CursorPos = data->CursorPos;
+#if IMGUI_VERSION_NUM < 19102
+                                if (data->Flags & ImGuiInputTextFlags_ReadOnly)
+                                    return 0;
+#endif
                                 if (data->SelectionStart == 0 && data->SelectionEnd == data->BufTextLen)
                                 {
                                     // When not editing a byte, always refresh its InputText content pulled from underlying memory data
@@ -334,35 +382,42 @@ struct MemoryEditor
                             char   CurrentBufOverwrite[3];  // Input
                             int    CursorPos;               // Output
                         };
-                        UserData user_data;
-                        user_data.CursorPos = -1;
-                        snprintf(user_data.CurrentBufOverwrite, 3, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
+                        InputTextUserData input_text_user_data;
+                        input_text_user_data.CursorPos = -1;
+                        ImSnprintf(input_text_user_data.CurrentBufOverwrite, 3, format_byte, ReadFn ? ReadFn(mem_data, addr, UserData) : mem_data[addr]);
                         ImGuiInputTextFlags flags = ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue | ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_NoHorizontalScroll | ImGuiInputTextFlags_CallbackAlways;
+                        if (ReadOnly)
+                            flags |= ImGuiInputTextFlags_ReadOnly;
                         flags |= ImGuiInputTextFlags_AlwaysOverwrite; // was ImGuiInputTextFlags_AlwaysInsertMode
                         ImGui::SetNextItemWidth(s.GlyphWidth * 2);
-                        if (ImGui::InputText("##data", DataInputBuf, IM_ARRAYSIZE(DataInputBuf), flags, UserData::Callback, &user_data))
+                        if (ImGui::InputText("##data", DataInputBuf, IM_ARRAYSIZE(DataInputBuf), flags, InputTextUserData::Callback, &input_text_user_data))
                             data_write = data_next = true;
                         else if (!DataEditingTakeFocus && !ImGui::IsItemActive())
                             DataEditingAddr = data_editing_addr_next = (size_t)-1;
                         DataEditingTakeFocus = false;
-                        if (user_data.CursorPos >= 2)
+                        if (input_text_user_data.CursorPos >= 2)
                             data_write = data_next = true;
                         if (data_editing_addr_next != (size_t)-1)
                             data_write = data_next = false;
                         unsigned int data_input_value = 0;
-                        if (data_write && sscanf(DataInputBuf, "%X", &data_input_value) == 1)
+                        if (!ReadOnly && data_write && sscanf(DataInputBuf, "%X", &data_input_value) == 1)
                         {
                             if (WriteFn)
-                                WriteFn(mem_data, addr, (ImU8)data_input_value);
+                                WriteFn(mem_data, addr, (ImU8)data_input_value, UserData);
                             else
                                 mem_data[addr] = (ImU8)data_input_value;
                         }
+                        if (ImGui::IsItemHovered())
+                        {
+                            MouseHovered = true;
+                            MouseHoveredAddr = addr;
+                        }
                         ImGui::PopID();
                     }
                     else
                     {
                         // NB: The trailing space is not visible but ensure there's no gap that the mouse cannot click on.
-                        ImU8 b = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];
+                        ImU8 b = ReadFn ? ReadFn(mem_data, addr, UserData) : mem_data[addr];
 
                         if (OptShowHexII)
                         {
@@ -382,10 +437,15 @@ struct MemoryEditor
                             else
                                 ImGui::Text(format_byte_space, b);
                         }
-                        if (!ReadOnly && ImGui::IsItemHovered() && ImGui::IsMouseClicked(0))
+                        if (ImGui::IsItemHovered())
                         {
-                            DataEditingTakeFocus = true;
-                            data_editing_addr_next = addr;
+                            MouseHovered = true;
+                            MouseHoveredAddr = addr;
+                            if (ImGui::IsMouseClicked(0))
+                            {
+                                DataEditingTakeFocus = true;
+                                data_editing_addr_next = addr;
+                            }
                         }
                     }
                 }
@@ -393,15 +453,24 @@ struct MemoryEditor
                 if (OptShowAscii)
                 {
                     // Draw ASCII values
-                    ImGui::SameLine(s.PosAsciiStart);
+                    ImGui::SameLine(s.OffsetAsciiMinX);
                     ImVec2 pos = ImGui::GetCursorScreenPos();
-                    addr = line_i * Cols;
+                    addr = (size_t)line_i * Cols;
+
+                    const float mouse_off_x = ImGui::GetIO().MousePos.x - pos.x;
+                    const size_t mouse_addr = (mouse_off_x >= 0.0f && mouse_off_x < s.OffsetAsciiMaxX - s.OffsetAsciiMinX) ? addr + (size_t)(mouse_off_x / s.GlyphWidth) : (size_t)-1;
+
                     ImGui::PushID(line_i);
-                    if (ImGui::InvisibleButton("ascii", ImVec2(s.PosAsciiEnd - s.PosAsciiStart, s.LineHeight)))
+                    if (ImGui::InvisibleButton("ascii", ImVec2(s.OffsetAsciiMaxX - s.OffsetAsciiMinX, s.LineHeight)))
                     {
-                        DataEditingAddr = DataPreviewAddr = addr + (size_t)((ImGui::GetIO().MousePos.x - pos.x) / s.GlyphWidth);
+                        DataEditingAddr = DataPreviewAddr = mouse_addr;
                         DataEditingTakeFocus = true;
                     }
+                    if (ImGui::IsItemHovered())
+                    {
+                        MouseHovered = true;
+                        MouseHoveredAddr = mouse_addr;
+                    }
                     ImGui::PopID();
                     for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
                     {
@@ -410,7 +479,11 @@ struct MemoryEditor
                             draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_FrameBg));
                             draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_TextSelectedBg));
                         }
-                        unsigned char c = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];
+                        else if (BgColorFn)
+                        {
+                            draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), BgColorFn(mem_data, addr, UserData));
+                        }
+                        unsigned char c = ReadFn ? ReadFn(mem_data, addr, UserData) : mem_data[addr];
                         char display_c = (c < 32 || c >= 128) ? '.' : c;
                         draw_list->AddText(pos, (display_c == c) ? color_text : color_disabled, &display_c, &display_c + 1);
                         pos.x += s.GlyphWidth;
@@ -418,11 +491,14 @@ struct MemoryEditor
                 }
             }
         ImGui::PopStyleVar(2);
+        const float child_width = ImGui::GetWindowSize().x;
         ImGui::EndChild();
 
         // Notify the main window of our ideal child content size (FIXME: we are missing an API to get the contents size from the child)
+        ImVec2 backup_pos = ImGui::GetCursorScreenPos();
         ImGui::SetCursorPosX(s.WindowWidth);
         ImGui::Dummy(ImVec2(0.0f, 0.0f));
+        ImGui::SetCursorScreenPos(backup_pos);
 
         if (data_next && DataEditingAddr + 1 < mem_size)
         {
@@ -447,18 +523,28 @@ struct MemoryEditor
             ImGui::Separator();
             DrawPreviewLine(s, mem_data, mem_size, base_display_addr);
         }
-    }
 
-    void DrawOptionsLine(const Sizes& s, void* mem_data, size_t mem_size, size_t base_display_addr)
-    {
-        IM_UNUSED(mem_data);
-        ImGuiStyle& style = ImGui::GetStyle();
-        const char* format_range = OptUpperCaseHex ? "Range %0*zX..%0*zX" : "Range %0*zx..%0*zx";
+        if (GotoAddr != (size_t)-1)
+        {
+            if (GotoAddr < mem_size)
+            {
+                ImGui::BeginChild("##scrolling");
+                ImGui::SetScrollY((GotoAddr / Cols) * ImGui::GetTextLineHeight() - avail_size.y * 0.5f);
+                ImGui::EndChild();
+                DataEditingAddr = DataPreviewAddr = GotoAddr;
+                DataEditingTakeFocus = true;
+            }
+            GotoAddr = (size_t)-1;
+        }
 
-        // Options menu
-        if (ImGui::Button("Options"))
-            ImGui::OpenPopup("context");
-        if (ImGui::BeginPopup("context"))
+        const ImVec2 contents_pos_end(contents_pos_start.x + child_width, ImGui::GetCursorScreenPos().y);
+        //ImGui::GetForegroundDrawList()->AddRect(contents_pos_start, contents_pos_end, IM_COL32(255, 0, 0, 255));
+        if (OptShowOptions)
+            if (ImGui::IsMouseHoveringRect(contents_pos_start, contents_pos_end))
+                if (ImGui::IsWindowHovered(ImGuiHoveredFlags_ChildWindows) && ImGui::IsMouseReleased(ImGuiMouseButton_Right))
+                    ImGui::OpenPopup("OptionsPopup");
+
+        if (ImGui::BeginPopup("OptionsPopup"))
         {
             ImGui::SetNextItemWidth(s.GlyphWidth * 7 + style.FramePadding.x * 2.0f);
             if (ImGui::DragInt("##cols", &Cols, 0.2f, 4, 32, "%d cols")) { ContentsWidthChanged = true; if (Cols < 1) Cols = 1; }
@@ -470,6 +556,17 @@ struct MemoryEditor
 
             ImGui::EndPopup();
         }
+    }
+
+    void DrawOptionsLine(const Sizes& s, void* mem_data, size_t mem_size, size_t base_display_addr)
+    {
+        IM_UNUSED(mem_data);
+        ImGuiStyle& style = ImGui::GetStyle();
+        const char* format_range = OptUpperCaseHex ? "Range %0*" _PRISizeT "X..%0*" _PRISizeT "X" : "Range %0*" _PRISizeT "x..%0*" _PRISizeT "x";
+
+        // Options menu
+        if (ImGui::Button("Options"))
+            ImGui::OpenPopup("OptionsPopup");
 
         ImGui::SameLine();
         ImGui::Text(format_range, s.AddrDigitsCount, base_display_addr, s.AddrDigitsCount, base_display_addr + mem_size - 1);
@@ -478,25 +575,18 @@ struct MemoryEditor
         if (ImGui::InputText("##addr", AddrInputBuf, IM_ARRAYSIZE(AddrInputBuf), ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue))
         {
             size_t goto_addr;
-            if (sscanf(AddrInputBuf, "%zX", &goto_addr) == 1)
+            if (sscanf(AddrInputBuf, "%" _PRISizeT "X", &goto_addr) == 1)
             {
                 GotoAddr = goto_addr - base_display_addr;
                 HighlightMin = HighlightMax = (size_t)-1;
             }
         }
 
-        if (GotoAddr != (size_t)-1)
-        {
-            if (GotoAddr < mem_size)
-            {
-                ImGui::BeginChild("##scrolling");
-                ImGui::SetScrollFromPosY(ImGui::GetCursorStartPos().y + (GotoAddr / Cols) * ImGui::GetTextLineHeight());
-                ImGui::EndChild();
-                DataEditingAddr = DataPreviewAddr = GotoAddr;
-                DataEditingTakeFocus = true;
-            }
-            GotoAddr = (size_t)-1;
-        }
+        //if (MouseHovered)
+        //{
+        //    ImGui::SameLine();
+        //    ImGui::Text("Hovered: %p", MouseHoveredAddr);
+        //}
     }
 
     void DrawPreviewLine(const Sizes& s, void* mem_data_void, size_t mem_size, size_t base_display_addr)
@@ -508,11 +598,16 @@ struct MemoryEditor
         ImGui::Text("Preview as:");
         ImGui::SameLine();
         ImGui::SetNextItemWidth((s.GlyphWidth * 10.0f) + style.FramePadding.x * 2.0f + style.ItemInnerSpacing.x);
+
+        static const ImGuiDataType supported_data_types[] = { ImGuiDataType_S8, ImGuiDataType_U8, ImGuiDataType_S16, ImGuiDataType_U16, ImGuiDataType_S32, ImGuiDataType_U32, ImGuiDataType_S64, ImGuiDataType_U64, ImGuiDataType_Float, ImGuiDataType_Double };
         if (ImGui::BeginCombo("##combo_type", DataTypeGetDesc(PreviewDataType), ImGuiComboFlags_HeightLargest))
         {
-            for (int n = 0; n < ImGuiDataType_COUNT; n++)
-                if (ImGui::Selectable(DataTypeGetDesc((ImGuiDataType)n), PreviewDataType == n))
-                    PreviewDataType = (ImGuiDataType)n;
+            for (int n = 0; n < IM_ARRAYSIZE(supported_data_types); n++)
+            {
+                ImGuiDataType data_type = supported_data_types[n];
+                if (ImGui::Selectable(DataTypeGetDesc(data_type), PreviewDataType == data_type))
+                    PreviewDataType = data_type;
+            }
             ImGui::EndCombo();
         }
         ImGui::SameLine();
@@ -534,18 +629,19 @@ struct MemoryEditor
         ImGui::Text("Bin"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
     }
 
-    // Utilities for Data Preview
+    // Utilities for Data Preview (since we don't access imgui_internal.h)
+    // FIXME: This technically depends on ImGuiDataType order.
     const char* DataTypeGetDesc(ImGuiDataType data_type) const
     {
         const char* descs[] = { "Int8", "Uint8", "Int16", "Uint16", "Int32", "Uint32", "Int64", "Uint64", "Float", "Double" };
-        IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
+        IM_ASSERT(data_type >= 0 && data_type < IM_ARRAYSIZE(descs));
         return descs[data_type];
     }
 
     size_t DataTypeGetSize(ImGuiDataType data_type) const
     {
         const size_t sizes[] = { 1, 1, 2, 2, 4, 4, 8, 8, sizeof(float), sizeof(double) };
-        IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
+        IM_ASSERT(data_type >= 0 && data_type < IM_ARRAYSIZE(sizes));
         return sizes[data_type];
     }
 
@@ -558,7 +654,7 @@ struct MemoryEditor
 
     bool IsBigEndian() const
     {
-        uint16_t x = 1;
+        ImU16 x = 1;
         char c[2];
         memcpy(c, &x, 2);
         return c[0] != 0;
@@ -568,8 +664,8 @@ struct MemoryEditor
     {
         if (is_little_endian)
         {
-            uint8_t* dst = (uint8_t*)_dst;
-            uint8_t* src = (uint8_t*)_src + s - 1;
+            ImU8* dst = (ImU8*)_dst;
+            ImU8* src = (ImU8*)_src + s - 1;
             for (int i = 0, n = (int)s; i < n; ++i)
                 memcpy(dst++, src--, 1);
             return _dst;
@@ -588,8 +684,8 @@ struct MemoryEditor
         }
         else
         {
-            uint8_t* dst = (uint8_t*)_dst;
-            uint8_t* src = (uint8_t*)_src + s - 1;
+            ImU8* dst = (ImU8*)_dst;
+            ImU8* src = (ImU8*)_src + s - 1;
             for (int i = 0, n = (int)s; i < n; ++i)
                 memcpy(dst++, src--, 1);
             return _dst;
@@ -598,13 +694,13 @@ struct MemoryEditor
 
     void* EndiannessCopy(void* dst, void* src, size_t size) const
     {
-        static void* (*fp)(void*, void*, size_t, int) = NULL;
-        if (fp == NULL)
+        static void* (*fp)(void*, void*, size_t, int) = nullptr;
+        if (fp == nullptr)
             fp = IsBigEndian() ? EndiannessCopyBigEndian : EndiannessCopyLittleEndian;
         return fp(dst, src, size, PreviewEndianness);
     }
 
-    const char* FormatBinary(const uint8_t* buf, int width) const
+    const char* FormatBinary(const ImU8* buf, int width) const
     {
         IM_ASSERT(width <= 64);
         size_t out_n = 0;
@@ -624,18 +720,18 @@ struct MemoryEditor
     // [Internal]
     void DrawPreviewData(size_t addr, const ImU8* mem_data, size_t mem_size, ImGuiDataType data_type, DataFormat data_format, char* out_buf, size_t out_buf_size) const
     {
-        uint8_t buf[8];
+        ImU8 buf[8];
         size_t elem_size = DataTypeGetSize(data_type);
         size_t size = addr + elem_size > mem_size ? mem_size - addr : elem_size;
         if (ReadFn)
             for (int i = 0, n = (int)size; i < n; ++i)
-                buf[i] = ReadFn(mem_data, addr + i);
+                buf[i] = ReadFn(mem_data, addr + i, UserData);
         else
             memcpy(buf, mem_data + addr, size);
 
         if (data_format == DataFormat_Bin)
         {
-            uint8_t binbuf[8];
+            ImU8 binbuf[8];
             EndiannessCopy(binbuf, buf, size);
             ImSnprintf(out_buf, out_buf_size, "%s", FormatBinary(binbuf, (int)size * 8));
             return;
@@ -646,84 +742,85 @@ struct MemoryEditor
         {
         case ImGuiDataType_S8:
         {
-            int8_t int8d = 0;
-            EndiannessCopy(&int8d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhd", int8d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", int8d & 0xFF); return; }
+            ImS8 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhd", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", data & 0xFF); return; }
             break;
         }
         case ImGuiDataType_U8:
         {
-            uint8_t uint8d = 0;
-            EndiannessCopy(&uint8d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhu", uint8d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", uint8d & 0XFF); return; }
+            ImU8 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhu", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", data & 0XFF); return; }
             break;
         }
         case ImGuiDataType_S16:
         {
-            int16_t int16d = 0;
-            EndiannessCopy(&int16d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hd", int16d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", int16d & 0xFFFF); return; }
+            ImS16 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hd", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", data & 0xFFFF); return; }
             break;
         }
         case ImGuiDataType_U16:
         {
-            uint16_t uint16d = 0;
-            EndiannessCopy(&uint16d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hu", uint16d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", uint16d & 0xFFFF); return; }
+            ImU16 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hu", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", data & 0xFFFF); return; }
             break;
         }
         case ImGuiDataType_S32:
         {
-            int32_t int32d = 0;
-            EndiannessCopy(&int32d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%d", int32d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", int32d); return; }
+            ImS32 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%d", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", data); return; }
             break;
         }
         case ImGuiDataType_U32:
         {
-            uint32_t uint32d = 0;
-            EndiannessCopy(&uint32d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%u", uint32d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", uint32d); return; }
+            ImU32 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%u", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", data); return; }
             break;
         }
         case ImGuiDataType_S64:
         {
-            int64_t int64d = 0;
-            EndiannessCopy(&int64d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%lld", (long long)int64d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)int64d); return; }
+            ImS64 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%lld", (long long)data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)data); return; }
             break;
         }
         case ImGuiDataType_U64:
         {
-            uint64_t uint64d = 0;
-            EndiannessCopy(&uint64d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%llu", (long long)uint64d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)uint64d); return; }
+            ImU64 data = 0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%llu", (long long)data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)data); return; }
             break;
         }
         case ImGuiDataType_Float:
         {
-            float float32d = 0.0f;
-            EndiannessCopy(&float32d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float32d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float32d); return; }
+            float data = 0.0f;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", data); return; }
             break;
         }
         case ImGuiDataType_Double:
         {
-            double float64d = 0.0;
-            EndiannessCopy(&float64d, buf, size);
-            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float64d); return; }
-            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float64d); return; }
+            double data = 0.0;
+            EndiannessCopy(&data, buf, size);
+            if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", data); return; }
+            if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", data); return; }
             break;
         }
+        default:
         case ImGuiDataType_COUNT:
             break;
         } // Switch
@@ -731,6 +828,7 @@ struct MemoryEditor
     }
 };
 
+#undef _PRISizeT
 #undef ImSnprintf
 
 #ifdef _MSC_VER




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