voidtools · syahdafahreza · May 1, 2026 · May 1, 2026 · May 1, 2026 · May 1, 2026
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -0,0 +1,43 @@
+name: Build
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Add MSBuild to PATH
+      uses: microsoft/setup-msbuild@v2
+
+    - name: Build x64
+      run: msbuild vs2026/voidImageViewer.sln /p:Configuration=Release /p:Platform=x64 /p:PlatformToolset=v143
+
+    - name: Build x86
+      run: msbuild vs2026/voidImageViewer.sln /p:Configuration=Release /p:Platform=Win32 /p:PlatformToolset=v143
+
+    - name: Setup NSIS
+      run: |
+        choco install nsis -y
+        "C:\Program Files (x86)\NSIS" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+    - name: Build Installer x64
+      run: powershell -File nsis/build_installer.ps1 -Arch x64 -VsVersion vs2026 -BuildConfig Release -Lang English
+
+    - name: Build Installer x86
+      run: powershell -File nsis/build_installer.ps1 -Arch x86 -VsVersion vs2026 -BuildConfig Release -Lang English
+
+    - name: Upload Artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: voidImageViewer-build
+        path: |
+          voidImageViewer/x64/Release/voidImageViewer.exe
+          voidImageViewer/Release/voidImageViewer.exe
+          nsis/voidImageViewer-*-setup.exe
diff --git a/Changes.txt b/Changes.txt
@@ -1,3 +1,13 @@
+Saturday, 29 August 2026: Version 1.2.1.0
+	added Smooth (Halftone) toggle to main viewer View menu and context menu.
+	added Compare Images side-by-side comparison mode with synchronized/individual zoom and pan.
+	added drag and drop support directly onto left/right compare panes.
+	added "Use Current Image" toggle per pane with mutual exclusion.
+	added mini toolbars per pane for file browsing, zooming, 1:1, fit, and rotation.
+	added top control bar with tips, Auto-Fit, Smooth, Filename overlay, and Close.
+	added WebP fallback decoder and alpha blending over window background for transparent PNG/ICO/GIF images.
+	added full multilingual localization for English, Indonesian, and Simplified Chinese.
+
 Monday, 12 January 2026: Version 1.0.0.15
 	fixed an issue with scrolling large images.
 	improved position offset when using numpad keys.

diff --git a/README.md b/README.md
@@ -26,25 +26,83 @@ void Image Viewer main window:
 
 void Image Viewer General Options:
 
-![Void Image Viewer Options General](https://www.voidtools.com/voidImageViewer.Options.General10.png)
+<img width="542" height="472" alt="image" src="https://github.com/user-attachments/assets/accca998-0a15-40f4-935b-d41d677f208b" />
 <br/><br/><br/>
 
 
 
 void Image Viewer View Options:
 
-![Void Image Viewer Options View](https://www.voidtools.com/voidImageViewer.Options.View10.png)
+<img width="542" height="472" alt="image" src="https://github.com/user-attachments/assets/316a167b-af09-4cbe-bec0-60ce396f047b" />
 <br/><br/><br/>
 
 
 
 void Image Viewer Controls Options:
 
-![Void Image Viewer Image Controls](https://www.voidtools.com/voidImageViewer.Options.Controls10.png)
+<img width="542" height="472" alt="image" src="https://github.com/user-attachments/assets/0a281f65-c849-4b0d-bcf9-0149badea0fc" />
 <br/><br/><br/>
 
 
 
+## Changelog
+
+### Version 1.2.1.0 (Latest)
+- **New Feature: Smooth Toggle in Main Viewer**
+  - Added **Smooth** (Halftone / Bilinear interpolation) toggle directly in the `View` menu and right-click context menu.
+  - Linked with configuration persistence (`shrink_blit_mode` / `mag_filter`), and seamlessly integrated with Compare Images initial smoothing state.
+- **New Feature: Compare Images (Side-by-Side Image Comparison)**
+  - Added multi-pane **Compare Images** window accessible via `View` -> `Compare Images...` or shortcut (`Ctrl+Alt+C`).
+  - **Drag & Drop Support:**
+    - Directly drag & drop image files from File Explorer to either the left or right pane to compare.
+    - Dropping 2 files simultaneously automatically loads them into the left and right panes.
+  - **"Use Current Image" Toggle:**
+    - Convenient checkbox on each pane to instantly load the image currently open in the main viewer.
+    - Automatically disables on the other pane when active to avoid duplicate/conflicting states.
+  - **Synchronized Navigation & Precise Zoom:**
+    - Mouse wheel zooms all compared images simultaneously using the exact same zoom engine (`_viv_calculate_next_zoom`) with synchronized viewport centers to eliminate drift.
+    - Left-click drag pans all compared images synchronously.
+    - **Individual Pane Mode:** Hold `Ctrl` key or use **Right Mouse Button** to zoom or pan only the hovered image pane.
+  - **Per-Pane Mini Toolbar:**
+    - Previous (`<`) and Next (`>`) buttons to browse folder/playlist images per pane.
+    - Zoom In (`+`), Zoom Out (`-`), Zoom % display, `1:1` (Actual size), and `Fit` (Best Fit) buttons.
+    - Rotate clockwise button (`90°`).
+    - Change/Select image file button (`...`).
+  - **Top Control Bar:**
+    - Helpful shortcut and mouse tips.
+    - **Auto-Fit** toggle to automatically scale images to fit pane viewports.
+    - **Smooth** toggle (Halftone / High-quality interpolation).
+    - **Filename** toggle with bright green overlay text (`filename`, `dimensions`, `file size`).
+    - **Close** button (or `ESC` key) to quickly return to main viewer.
+  - **Full Format Support & Alpha Transparency:**
+    - Native support for PNG (with alpha transparency), GIF, animated GIF, BMP, ICO, TIFF, JPEG, and WebP (via `libwebp` fallback decoder).
+    - Clean alpha blending over the window background color, preventing black background issues on transparent images.
+  - **Full Multilingual Localization:** Added translations for all compare UI elements in English (`en-US`), Indonesian (`id-ID`), and Simplified Chinese (`zh-CN`).
+
+### Version 1.1.0.0
+- **New Feature: Zoom Options Tab & Calculation Engine**
+  - Added dedicated **Zoom options** tab in Options dialog (`IDD_ZOOM`).
+  - Added customizable zoom calculation methods:
+    - **Relative step:** Multiplicative scaling using configured zoom step % (default: 10%).
+    - **Absolute step:** Additive scaling by fixed percentage point steps.
+    - **Fixed table:** Step-by-step navigation through a user-defined list of zoom percentage levels (default: `1;2;3;10;14;16;19;21;25;28;33;38;43;50;57;66;76;87;100;115;132;150;174;200;230;260;300;350;400;450;500;600;700;800;900;1000;1200;1400;1600;2000;3000;`).
+    - Added **Load default table** button to quickly restore default values.
+- **Improved Zoom Handling:** Pixel under cursor remains stationary during mouse wheel and shortcut zooms across all zoom methods.
+- **Expanded Localization:** Added full UI translations for the Zoom options page in English (`en-US`), Indonesian (`id-ID`), and Simplified Chinese (`zh-CN`).
+- **Configuration Persistence:** Zoom settings (`zoom_calc_method`, `zoom_step`, `zoom_fixed_table`) automatically saved to and loaded from `voidImageViewer.ini`.
+
+| Feature / Behavior | Before (v1.0.1.0) | After (v1.1.0.0) |
+| :--- | :--- | :--- |
+| **Zoom Calculation Method** | Hardcoded fixed exponential power steps (`_viv_zoom_pos` from 0 to 63) | Choice between **Relative step (%)**, **Absolute step (%)**, or customizable **Fixed table** |
+| **Zoom Step Config** | Fixed / non-configurable | Configurable zoom step percentage (default `10%`) |
+| **Fixed Table Values** | Not available | Semicolon-delimited custom table support (up to 50 ordered values) with default reset |
+| **Settings UI** | 3 tabs (*General*, *View*, *Controls*) | 4 tabs (*General*, *View*, *Controls*, ***Zoom options***) |
+| **Localization** | Dialog strings for 3 tabs | Full multilingual translations for all 4 tabs (English, Indonesian, Chinese) |
+| **INI Storage** | No zoom calculation preferences saved | Saves `zoom_calc_method`, `zoom_step`, `zoom_fixed_table` to INI |
+
+<br/><br/><br/>
+
 See also
 --------
 https://www.voidtools.com/forum/viewtopic.php?t=5623
+
diff --git a/comments.json b/comments.json
diff --git a/issues.json b/issues.json
diff --git a/nsis/version.nsh b/nsis/version.nsh
@@ -1,3 +1,4 @@
-!define VERSION "1.0.0.15"
+!define VERSION "1.2.1.0"
 !define BETAVERSION ""
 !define VERSIONYEAR "2026"
+
diff --git a/res/resource.h b/res/resource.h
@@ -25,6 +25,7 @@
 #define IDD_RENAME                      127
 #define IDD_JUMPTO                      128
 #define IDD_EVERYTHING                  129
+#define IDD_ZOOM                        130
 #define IDC_TAB1                        1003
 #define IDC_BMP                         1006
 #define IDC_GIF                         1007
@@ -90,15 +91,43 @@
 #define IDC_TITLE_BAR_FORMAT            1052
 #define IDC_SHRINK_BLIT_MODE_STATIC		1053
 #define IDC_MAGNIFY_BLIT_MODE_STATIC		1054
+#define IDC_RESET_WINDOW                    1055
+#define IDC_LANGUAGE_STATIC                 1056
+#define IDC_LANGUAGE_COMBOBOX               1057
+#define IDC_LOOP_ANIMATIONS_ONCE_STATIC     1058
+#define IDC_PRELOAD_NEXT_IMAGE_STATIC      1059
+#define IDC_CACHE_LAST_IMAGE_STATIC        1060
+#define IDC_WINDOWEDBACKGROUNDCOLOR_STATIC 1061
+#define IDC_FULLSCREENBACKGROUNDCOLOR_STATIC 1062
+#define IDC_LEFT_CLICK_ACTION_STATIC       1063
+#define IDC_RIGHT_CLICK_ACTION_STATIC      1064
+#define IDC_MOUSE_WHEEL_ACTION_STATIC      1065
+#define IDC_COMMANDS_STATIC                1066
+#define IDC_SETTINGS_FOR_SELECTED_COMMAND_STATIC 1067
+#define IDC_TITLE_BAR_FORMAT_STATIC        1068
+#define IDC_AUTO_SIZE_WINDOW_STATIC        1069
+#define IDC_EDIT_KEYBOARD_SHORTCUT_KEY_STATIC 1070
+#define IDC_EDIT_KEYBOARD_SHORTCUT_KEY_CURRENTLY_USED_BY_STATIC 1071
+#define IDC_CUSTOM_RATE_STATIC             1072
+#define IDC_TAB4                           1073
+#define IDC_ZOOM_STEP_STATIC               1074
+#define IDC_ZOOM_STEP_EDIT                 1075
+#define IDC_ZOOM_STEP_PERCENT_STATIC       1076
+#define IDC_ZOOM_STEP_DEFAULT_STATIC       1077
+#define IDC_ZOOM_CALC_METHOD_STATIC        1078
+#define IDC_ZOOM_CALC_RELATIVE_RADIO       1079
+#define IDC_ZOOM_CALC_ABSOLUTE_RADIO       1080
+#define IDC_ZOOM_CALC_FIXED_TABLE_RADIO    1081
+#define IDC_ZOOM_FIXED_TABLE_EDIT          1082
+#define IDC_ZOOM_LOAD_DEFAULT_TABLE_BUTTON 1083
 
 // Next default values for new objects
 // 
 #ifdef APSTUDIO_INVOKED
 #ifndef APSTUDIO_READONLY_SYMBOLS
 #define _APS_NO_MFC                     1
-#define _APS_NEXT_RESOURCE_VALUE        130
+#define _APS_NEXT_RESOURCE_VALUE        131
 #define _APS_NEXT_COMMAND_VALUE         40048
-#define _APS_NEXT_CONTROL_VALUE         1055
-#define _APS_NEXT_SYMED_VALUE           109
+#define _APS_NEXT_CONTROL_VALUE         1084
 #endif
 #endif