tests: drivers: display: Add test cases for AL_88

Enable display_read_write test for AL_88 color and add support for
AL_88 in display_check.

Signed-off-by: Martin Stumpf <[email protected]>

Author: Finomnis

tests/drivers/display/display_check/src/main.c

@@ -160,6 +160,34 @@ static inline void fill_buffer_l_8(enum corner corner, uint8_t grey, uint8_t *bu
 	}
 }
 
+static void fill_buffer_al_88(enum corner corner, uint8_t grey, uint8_t *buf,
+				 size_t buf_size)
+{
+	uint16_t color;
+
+	switch (corner) {
+	case TOP_LEFT:
+		color = 0xFF00u;
+		break;
+	case TOP_RIGHT:
+		color = 0xFFFFu;
+		break;
+	case BOTTOM_RIGHT:
+		color = 0xFF88u;
+		break;
+	case BOTTOM_LEFT:
+		color = 0xFF00u | grey;
+		break;
+	default:
+		color = 0;
+		break;
+	}
+
+	for (size_t idx = 0; idx < buf_size; idx += 2) {
+		*((uint16_t *)(buf + idx)) = color;
+	}
+}
+
 static inline void fill_buffer_mono01(enum corner corner, uint8_t grey,
 				      uint8_t *buf, size_t buf_size)
 {
@@ -268,6 +296,11 @@ int test_display(void)
 		bg_color = 0xFFu;
 		fill_buffer_fnc = fill_buffer_l_8;
 		break;
+	case PIXEL_FORMAT_AL_88:
+		bg_color = 0x00u;
+		fill_buffer_fnc = fill_buffer_al_88;
+		buf_size *= 2;
+		break;
 	case PIXEL_FORMAT_MONO01:
 		bg_color = 0xFFu;
 		fill_buffer_fnc = fill_buffer_mono01;

tests/drivers/display/display_read_write/src/main.c

@@ -34,6 +34,7 @@ static inline uint8_t bytes_per_pixel(enum display_pixel_format pixel_format)
 		return 3;
 	case PIXEL_FORMAT_RGB_565:
 	case PIXEL_FORMAT_BGR_565:
+	case PIXEL_FORMAT_AL_88:
 		return 2;
 	case PIXEL_FORMAT_L_8:
 	case PIXEL_FORMAT_MONO01:

tests/drivers/display/display_read_write/testcase.yaml

@@ -15,6 +15,12 @@ tests:
       - native_sim/native/64
     extra_configs:
       - CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_ARGB_8888=y
+  drivers.display.read_write.sdl.al88:
+    platform_allow:
+      - native_sim
+      - native_sim/native/64
+    extra_configs:
+      - CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_AL_88=y
   drivers.display.read_write.sdl.rgb888:
     platform_allow:
       - native_sim