[nrf fromtree] lvgl: Add config to disable monochrome pixel software inversion

In some cases, pixel inversion is managed by the display hardware
and software inversion is not required.

Signed-off-by: Robin-Charles Guihéneuf <[email protected]>
(cherry picked from commit b0715dd)

Author: vulporuza

doc/releases/release-notes-4.2.rst

@@ -212,6 +212,10 @@ New APIs and options
 
    * :kconfig:option:`CONFIG_NVME_PRP_PAGE_SIZE`
 
+* Other
+
+  * :kconfig:option:`CONFIG_LV_Z_COLOR_MONO_HW_INVERSION`
+
 New Boards
 **********
 

modules/lvgl/Kconfig

@@ -94,6 +94,10 @@ config LV_COLOR_16_SWAP
 	bool "Swap the 2 bytes of RGB565 color."
 	depends on LV_COLOR_DEPTH_16
 
+config LV_Z_COLOR_MONO_HW_INVERSION
+	bool "Hardware pixel inversion (disables software pixel inversion)."
+	depends on LV_COLOR_DEPTH_1
+
 config LV_Z_FLUSH_THREAD
 	bool "Flush LVGL frames in a separate thread"
 	help

modules/lvgl/lvgl_display_mono.c

@@ -38,17 +38,25 @@ static ALWAYS_INLINE void set_px_at_pos(uint8_t *dst_buf, uint32_t x, uint32_t y
 		}
 	}
 
+#ifdef CONFIG_LV_Z_COLOR_MONO_HW_INVERSION
+	*buf |= BIT(bit);
+#else
 	if (caps->current_pixel_format == PIXEL_FORMAT_MONO10) {
 		*buf |= BIT(bit);
 	} else {
 		*buf &= ~BIT(bit);
 	}
+#endif
 }
 
 static void lvgl_transform_buffer(uint8_t **px_map, uint32_t width, uint32_t height,
 				  const struct display_capabilities *caps)
 {
+#ifdef CONFIG_LV_Z_COLOR_MONO_HW_INVERSION
+	uint8_t clear_color = 0x00;
+#else
 	uint8_t clear_color = caps->current_pixel_format == PIXEL_FORMAT_MONO10 ? 0x00 : 0xFF;
+#endif
 
 	memset(mono_conv_buf, clear_color, mono_conv_buf_size);