[display] SDL2 display driver for host platform (#6825)

esphome/components/sdl/display.py

@@ -0,0 +1,72 @@
+import subprocess
+
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import display
+from esphome.const import (
+    CONF_ID,
+    CONF_DIMENSIONS,
+    CONF_WIDTH,
+    CONF_HEIGHT,
+    CONF_LAMBDA,
+    PLATFORM_HOST,
+)
+
+sdl_ns = cg.esphome_ns.namespace("sdl")
+Sdl = sdl_ns.class_("Sdl", display.Display, cg.Component)
+
+
+CONF_SDL_OPTIONS = "sdl_options"
+CONF_SDL_ID = "sdl_id"
+
+
+def get_sdl_options(value):
+    if value != "":
+        return value
+    try:
+        return subprocess.check_output(["sdl2-config", "--cflags", "--libs"]).decode()
+    except Exception as e:
+        raise cv.Invalid("Unable to run sdl2-config - have you installed sdl2?") from e
+
+
+CONFIG_SCHEMA = cv.All(
+    display.FULL_DISPLAY_SCHEMA.extend(
+        cv.Schema(
+            {
+                cv.GenerateID(): cv.declare_id(Sdl),
+                cv.Optional(CONF_SDL_OPTIONS, default=""): get_sdl_options,
+                cv.Required(CONF_DIMENSIONS): cv.Any(
+                    cv.dimensions,
+                    cv.Schema(
+                        {
+                            cv.Required(CONF_WIDTH): cv.int_,
+                            cv.Required(CONF_HEIGHT): cv.int_,
+                        }
+                    ),
+                ),
+            }
+        )
+    ),
+    cv.only_on(PLATFORM_HOST),
+)
+
+
+async def to_code(config):
+    for option in config[CONF_SDL_OPTIONS].split():
+        cg.add_build_flag(option)
+    cg.add_build_flag("-DSDL_BYTEORDER=4321")
+    var = cg.new_Pvariable(config[CONF_ID])
+    await display.register_display(var, config)
+
+    dimensions = config[CONF_DIMENSIONS]
+    if isinstance(dimensions, dict):
+        cg.add(var.set_dimensions(dimensions[CONF_WIDTH], dimensions[CONF_HEIGHT]))
+    else:
+        (width, height) = dimensions
+        cg.add(var.set_dimensions(width, height))
+
+    if lamb := config.get(CONF_LAMBDA):
+        lambda_ = await cg.process_lambda(
+            lamb, [(display.DisplayRef, "it")], return_type=cg.void
+        )
+        cg.add(var.set_writer(lambda_))