1.0: first version

.github/workflows/build_linux.yml

@@ -0,0 +1,46 @@
+name: Build Linux
+
+on:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+  # Triggers the workflow on push or pull request events but only for the develop branch
+  # push:
+  #   branches: [ develop ]
+  # pull_request:
+  #   branches: [ develop ]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-20.04
+            name: Linux-x64
+          # - os: macos-13
+          #   name: MacOS-x64
+          # - os: macos-14
+          #   name: MacOS-arm64
+    steps:
+
+      - name: Linux Depends
+        if: matrix.name == 'Linux-x64'
+        run: |
+          sudo apt-get install libgimp2.0-dev
+
+
+      - name: Check out repo
+        uses: actions/checkout@v4
+
+      - name: Build Linux
+        if: (matrix.name == 'Linux-x64')
+        shell: bash
+        run: |
+          make
+
+      - name: Store build
+        if: (matrix.name == 'Linux-x64')
+        uses: actions/upload-artifact@v4
+        with:
+          name: gimp-reduce-colordepth_Linux_x64
+          path: plugin-gimp-reduce-colordepth

.github/workflows/build_windows.yml

@@ -0,0 +1,60 @@
+name: Build Windows
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  # push:
+  #   branches: [ main ]
+  # pull_request:
+  #   branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+env:
+  CI: true
+
+jobs:
+  win:
+    strategy:
+      fail-fast: false
+      max-parallel: 2
+      matrix:
+        include: [
+          {msystem: MINGW32, toolchain: mingw-w64-i686, version: x32 },
+          {msystem: MINGW64, toolchain: mingw-w64-x86_64, version: x64 },
+        ]
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - name: Install msys2 build environment
+      uses: msys2/setup-msys2@v2
+      with:
+        msystem: ${{ matrix.msystem }}
+        update: false
+        install: base-devel git ${{ matrix.toolchain }}-toolchain ${{ matrix.toolchain }}-gimp
+
+
+    - run: git config --global core.autocrlf input
+      shell: bash
+
+    - uses: actions/checkout@v4
+
+    - name: Build plugin
+      shell: msys2 {0}
+      run: |
+        echo $(gimptool-2.0 -n --build src/main.c) | sh
+        mv main.exe plugin-gimp-reduce-colordepth-${{ matrix.version }}.exe
+        ls
+  
+    - name: Get GIMP version
+      shell: msys2 {0}
+      run: echo "GIMPVER=$(pacman -Q ${{ matrix.toolchain }}-gimp | cut -d ' ' -f 2)" >> $GITHUB_ENV
+
+    - uses: actions/upload-artifact@v4
+      with:
+        name: plugin-gimp-reduce-colordepth_${{ env.GIMPVER }}_${{ matrix.version }}
+        path: |
+          ./plugin-gimp-reduce-colordepth-${{ matrix.version }}.exe

.gitignore

@@ -1,5 +1,7 @@
 plugin-gimp-reduce-colordepth
 *.zip
 *.7z
+*.gz
+*.exe
 obj/
 src/reference/

Makefile

@@ -4,8 +4,12 @@ TARGET  = plugin-gimp-reduce-colordepth
 SRC_DIR = src
 OBJ_DIR = obj
 
+# -Wno-deprecated, -Wno-deprecated-declarations is just for gtk warnings for now (migration to GEGL)
 CFLAGS  = $(shell pkg-config --cflags gtk+-2.0) \
-          $(shell pkg-config --cflags gimp-2.0)
+          $(shell pkg-config --cflags gimp-2.0) \
+          -Wno-format-truncation \
+          -Wno-deprecated \
+          -Wno-deprecated-declarations
 LFLAGS  = $(shell pkg-config --libs glib-2.0) \
           $(shell pkg-config --libs gtk+-2.0) \
           $(shell pkg-config --libs gimp-2.0) \

Readme.md

@@ -9,7 +9,17 @@ The functionality is similar to the built-in `Colors -> Dither` plugin except th
 The plugin menu location is: `Colors -> Reduce Color Bit-Depth...`
 
 ## Compatibility
-At least compatible with some versions of GIMP 2.10 on Linux
+At least compatible with some versions of GIMP 2.10 on Linux and Windows.
+
+## Download
+Pre-built binaries can be downloaded from the [Releases section](https://github.com/bbbbbr/gimp-plugin-reduce-color-depth/releases).
+
+## Install
+Copy the plugin file to the relevant location below.
+
+Plug-in folder locations:
+- Linux: `~/.config/GIMP/2.10/plug-ins`
+- Windows: `C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins`
 
 
 Screenshot:

src/main.c

@@ -215,15 +215,15 @@ static gboolean dialog(GimpDrawable * drawable) {
     gtk_box_pack_start(GTK_BOX(main_vbox), table, FALSE, FALSE, 0);
     gtk_widget_show(table);
 
-    adj_red = gtk_adjustment_new(settings.red_depth, 1, 8, 1, 1, 0);
+    adj_red = (GtkAdjustment *)gtk_adjustment_new(settings.red_depth, 1, 8, 1, 1, 0);
     spin_red = gtk_spin_button_new(adj_red, 1.0, 0);
     gimp_table_attach_aligned(GTK_TABLE(table), 0, 0, "Red Channel Depth:", 0.0, 0.5, spin_red, 1, TRUE);
 
-    adj_green = gtk_adjustment_new(settings.green_depth, 1, 8, 1, 1, 0);
+    adj_green = (GtkAdjustment *)gtk_adjustment_new(settings.green_depth, 1, 8, 1, 1, 0);
     spin_green = gtk_spin_button_new(adj_green, 1.0, 0);
     gimp_table_attach_aligned(GTK_TABLE(table), 0, 1, "Green Channel Depth:", 0.0, 0.5, spin_green, 1, TRUE);
 
-    adj_blue = gtk_adjustment_new(settings.blue_depth, 1, 8, 1, 1, 0);
+    adj_blue = (GtkAdjustment *)gtk_adjustment_new(settings.blue_depth, 1, 8, 1, 1, 0);
     spin_blue = gtk_spin_button_new(adj_blue, 1.0, 0);
     gimp_table_attach_aligned(GTK_TABLE(table), 0, 2, "Blue Channel Depth:", 0.0, 0.5, spin_blue, 1, TRUE);
 
@@ -308,7 +308,7 @@ static void ui_checkboxes_update(GtkToggleButton * widget, gpointer callback_dat
     settings.clamp_lowest_bitval = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(check_clamp_lowest_bitval));
 
     if (settings.lock_channels)
-        ui_locked_channels_sync(adj_red, &settings.red_depth);
+        ui_locked_channels_sync((GtkWidget *)adj_red, &settings.red_depth);
 }
 
 
@@ -357,7 +357,7 @@ static void process(GimpDrawable * drawable, GimpPreview * preview) {
     //
     // It doesn't seem to actually allocate the buffer (flushing with it fails, there are no
     // reported GEGL buffer leaks on app shutdown), so I guess we won't bother to free it.
-    GeglBuffer * buffer = gimp_drawable_get_buffer(drawable);
+    GeglBuffer * buffer = gimp_drawable_get_buffer(drawable->drawable_id);
 
 
     red_mask   = ((1 << settings.red_depth)   - 1) << (8 - settings.red_depth);