feat(ktx): add khronos ktx-tool support as additional strategy

Author: danila-schelkov

.gitignore

@@ -17,3 +17,4 @@ config.json
 
 # PVRTexToolCLI
 PVRTexToolCLI*
+.DS_Store

pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
     "sc-compression==0.6.6",
     "colorama==0.4.6",
     "zstandard>=0.23.0,<0.24",
-    "pillow~=11.2.1",
+    "pillow~=12.1.0",
     "loguru==0.7.3",
 ]
 
@@ -29,6 +29,7 @@ dev = [
     "black>=24.8.0,<25",
     "pre-commit>=3.8.0,<4",
     "ruff>=0.11.2,<0.12",
+    "ty>=0.0.15",
 ]
 
 [project.scripts]

src/ktx/__init__.py

@@ -0,0 +1,74 @@
+import os
+from pathlib import Path
+import tempfile
+from typing import ClassVar
+
+from PIL import Image
+
+from ktx.exceptions import ToolNotFoundException
+
+from .ktx_tool import KhronosKtxTool
+from .pvr_tex_tool import PvrTexTool
+from .tool_protocol import KtxToolProtocol
+
+
+def get_image_from_ktx_data(data: bytes) -> Image.Image:
+    with tempfile.NamedTemporaryFile(delete=False, suffix=".ktx1") as tmp:
+        tmp.write(data)
+
+    try:
+        image = get_image_from_ktx(Path(tmp.name))
+    finally:
+        os.remove(tmp.name)
+
+    return image
+
+
+def get_image_from_ktx(filepath: Path) -> Image.Image:
+    png_filepath = KtxTool.convert_ktx_to_png(filepath)
+    image_open = Image.open(png_filepath)
+
+    try:
+        return image_open.copy()
+    finally:
+        image_open.close()
+        os.remove(png_filepath)
+
+
+class KtxTool:
+    TOOLS: ClassVar[tuple[KtxToolProtocol, ...]] = (
+        KhronosKtxTool,
+        PvrTexTool,
+    )
+
+    @classmethod
+    def is_available(cls) -> bool:
+        for tool in cls.TOOLS:
+            if tool.is_available():
+                return True
+
+        return False
+
+    @classmethod
+    def convert_ktx_to_png(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        for tool in cls.TOOLS:
+            if not tool.is_available():
+                continue
+
+            return tool.convert_ktx_to_png(filepath, output_folder)
+
+        raise ToolNotFoundException("No tools available for ktx handling")
+
+    @classmethod
+    def convert_png_to_ktx(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        for tool in cls.TOOLS:
+            if not tool.is_available():
+                continue
+
+            return tool.convert_png_to_ktx(filepath, output_folder)
+
+        raise ToolNotFoundException("No tools available for ktx handling")

src/ktx/_common.py

@@ -0,0 +1,31 @@
+import os
+from pathlib import Path
+import platform
+
+# Put executable files in "src/ktx/bin"
+_main_dir = Path(__file__).parent
+bin_dir = _main_dir / "bin"
+
+
+# Note: a solution from
+# https://stackoverflow.com/questions/11210104/check-if-a-program-exists-from-a-python-script
+def get_executable_path(
+    *paths: os.PathLike[str] | str,
+) -> os.PathLike[str] | str | None:
+    from shutil import which
+
+    for path in paths:
+        # Fix of https://github.com/xcoder-tool/XCoder/issues/22
+        executable_path = which(path)
+        if executable_path is not None:
+            return path
+
+    return None
+
+
+is_windows = platform.system() == "Windows"
+null_output = f"{'nul' if is_windows else '/dev/null'} 2>&1"
+
+
+def run(command: str, output_path: str = null_output) -> int:
+    return os.system(f"{command} > {output_path}")

src/ktx/exceptions/__init__.py

@@ -0,0 +1,3 @@
+from ._tool_not_found import ToolNotFoundException
+
+__all__ = ["ToolNotFoundException"]

src/ktx/exceptions/_tool_not_found.py

@@ -0,0 +1 @@
+class ToolNotFoundException(Exception): ...

src/ktx/ktx_tool.py

@@ -0,0 +1,64 @@
+from pathlib import Path
+
+from ._common import bin_dir, get_executable_path, run
+from .exceptions import ToolNotFoundException
+
+_toktx_cli_name = "toktx"
+_toktx_cli_path = get_executable_path(bin_dir / _toktx_cli_name, _toktx_cli_name)
+
+_ktx_cli_name = "ktx"
+_ktx_cli_path = get_executable_path(bin_dir / _ktx_cli_name, _ktx_cli_name)
+
+_ktx2ktx2_cli_name = "ktx2ktx2"
+_ktx2ktx2_cli_path = get_executable_path(
+    bin_dir / _ktx2ktx2_cli_name, _ktx2ktx2_cli_name
+)
+
+
+class KhronosKtxTool:
+    @classmethod
+    def is_available(cls) -> bool:
+        return (
+            _ktx_cli_path is not None
+            and _ktx2ktx2_cli_path is not None
+            and _toktx_cli_path is not None
+        )
+
+    @classmethod
+    def convert_ktx_to_png(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        cls._ensure_tool_installed()
+
+        ktx2_filepath = filepath.with_suffix(".ktx2")
+        output_filepath = filepath.with_suffix(".png")
+        if output_folder is not None:
+            output_filepath = output_folder / output_filepath.name
+
+        run(f"{_ktx2ktx2_cli_path} {filepath!s}")
+        run(f"{_ktx_cli_path} extract {ktx2_filepath!s} {output_filepath!s}")
+
+        return output_filepath
+
+    @classmethod
+    def convert_png_to_ktx(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        cls._ensure_tool_installed()
+
+        output_filepath = filepath.with_suffix(".ktx")
+        if output_folder is not None:
+            output_filepath = output_folder / output_filepath.name
+
+        run(
+            f"{_toktx_cli_path} --encode etc1s --genmipmap {output_filepath!s} {filepath!s}"
+        )
+
+        return output_filepath
+
+    @classmethod
+    def _ensure_tool_installed(cls):
+        if cls.is_available():
+            return
+
+        raise ToolNotFoundException("ktx-tool not found.")

src/ktx/pvr_tex_tool.py

@@ -0,0 +1,56 @@
+from pathlib import Path
+
+from ._common import bin_dir, get_executable_path, run
+from .exceptions import ToolNotFoundException
+
+_color_space = "sRGB"
+_format = "ETC1,UBN,lRGB"
+_quality = "etcfast"
+
+_cli_name = "PVRTexToolCLI"
+_cli_path = get_executable_path(bin_dir / _cli_name, _cli_name)
+
+
+class PvrTexTool:
+    @classmethod
+    def is_available(cls) -> bool:
+        return _cli_path is not None
+
+    @classmethod
+    def convert_ktx_to_png(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        cls._ensure_tool_installed()
+
+        output_filepath = filepath.with_suffix(".png")
+        if output_folder is not None:
+            output_filepath = output_folder / output_filepath.name
+
+        run(
+            f"{_cli_path} -noout -ics {_color_space} -i {filepath!s} -d {output_filepath!s}"
+        )
+
+        return output_filepath
+
+    @classmethod
+    def convert_png_to_ktx(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path:
+        cls._ensure_tool_installed()
+
+        output_filepath = filepath.with_suffix(".ktx")
+        if output_folder is not None:
+            output_filepath = output_folder / output_filepath.name
+
+        run(
+            f"{_cli_path} -f {_format} -q {_quality} -i {filepath!s} -o {output_filepath!s}"
+        )
+
+        return output_filepath
+
+    @classmethod
+    def _ensure_tool_installed(cls):
+        if cls.is_available():
+            return
+
+        raise ToolNotFoundException("PVRTexTool not found.")

src/ktx/tool_protocol.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+from typing import Protocol
+
+
+class KtxToolProtocol(Protocol):
+    @classmethod
+    def is_available(cls) -> bool: ...
+
+    @classmethod
+    def convert_ktx_to_png(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path: ...
+
+    @classmethod
+    def convert_png_to_ktx(
+        cls, filepath: Path, output_folder: Path | None = None
+    ) -> Path: ...