drivers/display/display_sdl.c

/*
 * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
 * Copyright (c) 2021 Nordic Semiconductor
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define DT_DRV_COMPAT zephyr_sdl_dc

#include <zephyr/drivers/display.h>

#include <string.h>
#include <stdlib.h>
#include <soc.h>
#include <zephyr/sys/byteorder.h>
#include "display_sdl_bottom.h"
#include "cmdline.h"

#define LOG_LEVEL CONFIG_DISPLAY_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(display_sdl);

static uint32_t sdl_display_zoom_pct;

struct sdl_display_config {
	uint16_t height;
	uint16_t width;
};

struct sdl_display_data {
	void *window;
	void *renderer;
	void *mutex;
	void *texture;
	void *read_texture;
	bool display_on;
	enum display_pixel_format current_pixel_format;
	uint8_t *buf;
	uint8_t *read_buf;
};

static inline uint32_t mono_pixel_order(uint32_t order)
{
	if (IS_ENABLED(CONFIG_SDL_DISPLAY_MONO_MSB_FIRST)) {
		return BIT(7 - order);
	} else {
		return BIT(order);
	}
}

static int sdl_display_init(const struct device *dev)
{
	const struct sdl_display_config *config = dev->config;
	struct sdl_display_data *disp_data = dev->data;
	bool use_accelerator = true;
	LOG_DBG("Initializing display driver");

	IF_DISABLED(CONFIG_SDL_DISPLAY_USE_HARDWARE_ACCELERATOR, (use_accelerator = false));

	disp_data->current_pixel_format =
#if defined(CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_RGB_888)
		PIXEL_FORMAT_RGB_888
#elif defined(CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_MONO01)
		PIXEL_FORMAT_MONO01
#elif defined(CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_MONO10)
		PIXEL_FORMAT_MONO10
#elif defined(CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_RGB_565)
		PIXEL_FORMAT_RGB_565
#elif defined(CONFIG_SDL_DISPLAY_DEFAULT_PIXEL_FORMAT_BGR_565)
		PIXEL_FORMAT_BGR_565
#else /* SDL_DISPLAY_DEFAULT_PIXEL_FORMAT */
		PIXEL_FORMAT_ARGB_8888
#endif /* SDL_DISPLAY_DEFAULT_PIXEL_FORMAT */
		;

	if (sdl_display_zoom_pct == UINT32_MAX) {
		sdl_display_zoom_pct = CONFIG_SDL_DISPLAY_ZOOM_PCT;
	}

	int rc = sdl_display_init_bottom(config->height, config->width, sdl_display_zoom_pct,
					 use_accelerator, &disp_data->window, &disp_data->renderer,
					 &disp_data->mutex, &disp_data->texture,
					 &disp_data->read_texture);

	if (rc != 0) {
		LOG_ERR("Failed to create SDL display");
		return -EIO;
	}

	disp_data->display_on = false;

	return 0;
}

static void sdl_display_write_argb8888(void *disp_buf,
		const struct display_buffer_descriptor *desc, const void *buf)
{
	__ASSERT((desc->pitch * 4U * desc->height) <= desc->buf_size,
			"Input buffer to small");

	memcpy(disp_buf, buf, desc->pitch * 4U * desc->height);
}

static void sdl_display_write_rgb888(uint8_t *disp_buf,
		const struct display_buffer_descriptor *desc, const void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint32_t pixel;
	const uint8_t *byte_ptr;

	__ASSERT((desc->pitch * 3U * desc->height) <= desc->buf_size,
			"Input buffer to small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			byte_ptr = (const uint8_t *)buf +
				((h_idx * desc->pitch) + w_idx) * 3U;
			pixel = *byte_ptr << 16;
			pixel |= *(byte_ptr + 1) << 8;
			pixel |= *(byte_ptr + 2);
			*((uint32_t *)disp_buf) = pixel;
			disp_buf += 4;
		}
	}
}

static void sdl_display_write_rgb565(uint8_t *disp_buf,
		const struct display_buffer_descriptor *desc, const void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint32_t pixel;
	const uint16_t *pix_ptr;
	uint16_t rgb565;

	__ASSERT((desc->pitch * 2U * desc->height) <= desc->buf_size,
			"Input buffer to small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			pix_ptr = (const uint16_t *)buf +
				((h_idx * desc->pitch) + w_idx);
			rgb565 = sys_be16_to_cpu(*pix_ptr);
			pixel = (((rgb565 >> 11) & 0x1F) * 255 / 31) << 16;
			pixel |= (((rgb565 >> 5) & 0x3F) * 255 / 63) << 8;
			pixel |= (rgb565 & 0x1F) * 255 / 31;
			*((uint32_t *)disp_buf) = pixel;
			disp_buf += 4;
		}
	}
}

static void sdl_display_write_bgr565(uint8_t *disp_buf,
		const struct display_buffer_descriptor *desc, const void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint32_t pixel;
	const uint16_t *pix_ptr;

	__ASSERT((desc->pitch * 2U * desc->height) <= desc->buf_size,
			"Input buffer to small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			pix_ptr = (const uint16_t *)buf +
				((h_idx * desc->pitch) + w_idx);
			pixel = (((*pix_ptr >> 11) & 0x1F) * 255 / 31) << 16;
			pixel |= (((*pix_ptr >> 5) & 0x3F) * 255 / 63) << 8;
			pixel |= (*pix_ptr & 0x1F) * 255 / 31;
			*((uint32_t *)disp_buf) = pixel;
			disp_buf += 4;
		}
	}
}

static void sdl_display_write_mono(uint8_t *disp_buf,
		const struct display_buffer_descriptor *desc, const void *buf,
		const bool one_is_black)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint32_t tile_idx;
	uint32_t pixel;
	const uint8_t *byte_ptr;
	uint32_t one_color;
	uint8_t *disp_buf_start;

	__ASSERT((desc->pitch * desc->height) <= (desc->buf_size * 8U),
			"Input buffer to small");
	__ASSERT((desc->height % 8) == 0U,
			"Input buffer height not aligned per 8 pixels");

	if (one_is_black) {
		one_color = 0U;
	} else {
		one_color = 0x00FFFFFF;
	}

	for (tile_idx = 0U; tile_idx < desc->height/8U; ++tile_idx) {
		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			byte_ptr = (const uint8_t *)buf +
				((tile_idx * desc->pitch) + w_idx);
			disp_buf_start = disp_buf;
			for (h_idx = 0U; h_idx < 8; ++h_idx) {
				if ((*byte_ptr & mono_pixel_order(h_idx)) != 0U)  {
					pixel = one_color;
				} else {
					pixel = (~one_color) & 0x00FFFFFF;
				}
				*((uint32_t *)disp_buf) = pixel;
				disp_buf += (desc->width * 4U);
			}
			disp_buf = disp_buf_start;
			disp_buf += 4;
		}
		disp_buf += 7 * (desc->width * 4U);
	}
}

static int sdl_display_write(const struct device *dev, const uint16_t x,
			     const uint16_t y,
			     const struct display_buffer_descriptor *desc,
			     const void *buf)
{
	const struct sdl_display_config *config = dev->config;
	struct sdl_display_data *disp_data = dev->data;

	LOG_DBG("Writing %dx%d (w,h) bitmap @ %dx%d (x,y)", desc->width,
			desc->height, x, y);

	__ASSERT(desc->width <= desc->pitch, "Pitch is smaller then width");
	__ASSERT(desc->pitch <= config->width,
		"Pitch in descriptor is larger than screen size");
	__ASSERT(desc->height <= config->height,
		"Height in descriptor is larger than screen size");
	__ASSERT(x + desc->pitch <= config->width,
		 "Writing outside screen boundaries in horizontal direction");
	__ASSERT(y + desc->height <= config->height,
		 "Writing outside screen boundaries in vertical direction");

	if (desc->width > desc->pitch ||
	    x + desc->pitch > config->width ||
	    y + desc->height > config->height) {
		return -EINVAL;
	}

	if (disp_data->current_pixel_format == PIXEL_FORMAT_ARGB_8888) {
		sdl_display_write_argb8888(disp_data->buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_RGB_888) {
		sdl_display_write_rgb888(disp_data->buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_MONO10) {
		sdl_display_write_mono(disp_data->buf, desc, buf, true);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_MONO01) {
		sdl_display_write_mono(disp_data->buf, desc, buf, false);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_RGB_565) {
		sdl_display_write_rgb565(disp_data->buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_BGR_565) {
		sdl_display_write_bgr565(disp_data->buf, desc, buf);
	}

	sdl_display_write_bottom(desc->height, desc->width, x, y,
				 disp_data->renderer, disp_data->mutex, disp_data->texture,
				 disp_data->buf, disp_data->display_on);

	return 0;
}

static void sdl_display_read_argb8888(const uint8_t *read_buf,
				      const struct display_buffer_descriptor *desc, void *buf)
{
	__ASSERT((desc->pitch * 4U * desc->height) <= desc->buf_size, "Read buffer is too small");

	memcpy(buf, read_buf, desc->pitch * 4U * desc->height);
}

static void sdl_display_read_rgb888(const uint8_t *read_buf,
				    const struct display_buffer_descriptor *desc, void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint8_t *buf8;
	const uint32_t *pix_ptr;

	__ASSERT((desc->pitch * 3U * desc->height) <= desc->buf_size, "Read buffer is too small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		buf8 = ((uint8_t *)buf) + desc->pitch * 3U * h_idx;

		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			pix_ptr = (const uint32_t *)read_buf + ((h_idx * desc->pitch) + w_idx);
			*buf8 = (*pix_ptr & 0xFF0000) >> 16;
			buf8 += 1;
			*buf8 = (*pix_ptr & 0xFF00) >> 8;
			buf8 += 1;
			*buf8 = (*pix_ptr & 0xFF);
			buf8 += 1;
		}
	}
}

static void sdl_display_read_rgb565(const uint8_t *read_buf,
				    const struct display_buffer_descriptor *desc, void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint16_t pixel;
	uint16_t *buf16;
	const uint32_t *pix_ptr;

	__ASSERT((desc->pitch * 2U * desc->height) <= desc->buf_size, "Read buffer is too small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		buf16 = (void *)(((uint8_t *)buf) + desc->pitch * 2U * h_idx);

		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			pix_ptr = (const uint32_t *)read_buf + ((h_idx * desc->pitch) + w_idx);
			pixel = (*pix_ptr & 0xF80000) >> 8;
			pixel |= (*pix_ptr & 0x00FC00) >> 5;
			pixel |= (*pix_ptr & 0x0000F8) >> 3;
			*buf16 = sys_be16_to_cpu(pixel);
			buf16 += 1;
		}
	}
}

static void sdl_display_read_bgr565(const uint8_t *read_buf,
				    const struct display_buffer_descriptor *desc, void *buf)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint16_t pixel;
	uint16_t *buf16;
	const uint32_t *pix_ptr;

	__ASSERT((desc->pitch * 2U * desc->height) <= desc->buf_size, "Read buffer is too small");

	for (h_idx = 0U; h_idx < desc->height; ++h_idx) {
		buf16 = (void *)(((uint8_t *)buf) + desc->pitch * 2U * h_idx);

		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			pix_ptr = (const uint32_t *)read_buf + ((h_idx * desc->pitch) + w_idx);
			pixel = (*pix_ptr & 0xF80000) >> 8;
			pixel |= (*pix_ptr & 0x00FC00) >> 5;
			pixel |= (*pix_ptr & 0x0000F8) >> 3;
			*buf16 = pixel;
			buf16 += 1;
		}
	}
}

static void sdl_display_read_mono(const uint8_t *read_buf,
				  const struct display_buffer_descriptor *desc, void *buf,
				  const bool one_is_black)
{
	uint32_t w_idx;
	uint32_t h_idx;
	uint32_t tile_idx;
	uint8_t tile;
	const uint32_t *pix_ptr;
	uint8_t *buf8;

	__ASSERT((desc->pitch * desc->height) <= (desc->buf_size * 8U), "Read buffer is too small");
	__ASSERT((desc->height % 8U) == 0U, "Read buffer height not aligned per 8 pixels");

	for (tile_idx = 0U; tile_idx < (desc->height / 8U); ++tile_idx) {
		buf8 = (void *)(((uint8_t *)buf) + desc->pitch * tile_idx);

		for (w_idx = 0U; w_idx < desc->width; ++w_idx) {
			tile = 0;

			for (h_idx = 0U; h_idx < 8; ++h_idx) {
				pix_ptr = (const uint32_t *)read_buf +
					  ((tile_idx * 8 + h_idx) * desc->pitch + w_idx);
				if ((*pix_ptr)) {
					tile |= mono_pixel_order(h_idx);
				}
			}
			*buf8 = one_is_black ? ~tile : tile;
			buf8 += 1;
		}
	}
}

static int sdl_display_read(const struct device *dev, const uint16_t x,
			    const uint16_t y,
			    const struct display_buffer_descriptor *desc,
			    void *buf)
{
	struct sdl_display_data *disp_data = dev->data;
	int err;

	LOG_DBG("Reading %dx%d (w,h) bitmap @ %dx%d (x,y)", desc->width,
			desc->height, x, y);

	__ASSERT(desc->width <= desc->pitch, "Pitch is smaller than width");

	memset(disp_data->read_buf, 0, desc->pitch * desc->height * 4);

	err = sdl_display_read_bottom(desc->height, desc->width, x, y, disp_data->renderer,
				      disp_data->read_buf, desc->pitch, disp_data->mutex,
				      disp_data->texture, disp_data->read_texture);

	if (err) {
		return err;
	}

	if (disp_data->current_pixel_format == PIXEL_FORMAT_ARGB_8888) {
		sdl_display_read_argb8888(disp_data->read_buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_RGB_888) {
		sdl_display_read_rgb888(disp_data->read_buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_MONO10) {
		sdl_display_read_mono(disp_data->read_buf, desc, buf, true);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_MONO01) {
		sdl_display_read_mono(disp_data->read_buf, desc, buf, false);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_RGB_565) {
		sdl_display_read_rgb565(disp_data->read_buf, desc, buf);
	} else if (disp_data->current_pixel_format == PIXEL_FORMAT_BGR_565) {
		sdl_display_read_bgr565(disp_data->read_buf, desc, buf);
	}

	return 0;
}

static int sdl_display_blanking_off(const struct device *dev)
{
	struct sdl_display_data *disp_data = dev->data;

	LOG_DBG("Turning display blacking off");

	disp_data->display_on = true;

	sdl_display_blanking_off_bottom(disp_data->renderer, disp_data->texture);

	return 0;
}

static int sdl_display_blanking_on(const struct device *dev)
{
	struct sdl_display_data *disp_data = dev->data;

	LOG_DBG("Turning display blanking on");

	disp_data->display_on = false;

	sdl_display_blanking_on_bottom(disp_data->renderer);
	return 0;
}

static void sdl_display_get_capabilities(
	const struct device *dev, struct display_capabilities *capabilities)
{
	const struct sdl_display_config *config = dev->config;
	struct sdl_display_data *disp_data = dev->data;

	memset(capabilities, 0, sizeof(struct display_capabilities));
	capabilities->x_resolution = config->width;
	capabilities->y_resolution = config->height;
	capabilities->supported_pixel_formats = PIXEL_FORMAT_ARGB_8888 |
		PIXEL_FORMAT_RGB_888 |
		PIXEL_FORMAT_MONO01 |
		PIXEL_FORMAT_MONO10 |
		PIXEL_FORMAT_RGB_565 |
		PIXEL_FORMAT_BGR_565;
	capabilities->current_pixel_format = disp_data->current_pixel_format;
	capabilities->screen_info = SCREEN_INFO_MONO_VTILED |
		(IS_ENABLED(CONFIG_SDL_DISPLAY_MONO_MSB_FIRST) ? SCREEN_INFO_MONO_MSB_FIRST : 0);
}

static int sdl_display_set_pixel_format(const struct device *dev,
		const enum display_pixel_format pixel_format)
{
	struct sdl_display_data *disp_data = dev->data;

	switch (pixel_format) {
	case PIXEL_FORMAT_ARGB_8888:
	case PIXEL_FORMAT_RGB_888:
	case PIXEL_FORMAT_MONO01:
	case PIXEL_FORMAT_MONO10:
	case PIXEL_FORMAT_RGB_565:
	case PIXEL_FORMAT_BGR_565:
		disp_data->current_pixel_format = pixel_format;
		return 0;
	default:
		LOG_ERR("Pixel format not supported");
		return -ENOTSUP;
	}
}

static void sdl_display_cleanup(struct sdl_display_data *disp_data)
{
	sdl_display_cleanup_bottom(&disp_data->window, &disp_data->renderer, &disp_data->mutex,
				   &disp_data->texture, &disp_data->read_texture);
}

static const struct display_driver_api sdl_display_api = {
	.blanking_on = sdl_display_blanking_on,
	.blanking_off = sdl_display_blanking_off,
	.write = sdl_display_write,
	.read = sdl_display_read,
	.get_capabilities = sdl_display_get_capabilities,
	.set_pixel_format = sdl_display_set_pixel_format,
};

#define DISPLAY_SDL_DEFINE(n)						\
	static const struct sdl_display_config sdl_config_##n = {	\
		.height = DT_INST_PROP(n, height),			\
		.width = DT_INST_PROP(n, width),			\
	};								\
									\
	static uint8_t sdl_buf_##n[4 * DT_INST_PROP(n, height)		\
				   * DT_INST_PROP(n, width)];		\
	static uint8_t sdl_read_buf_##n[4 * DT_INST_PROP(n, height)	\
					* DT_INST_PROP(n, width)];	\
	static struct sdl_display_data sdl_data_##n = {			\
		.buf = sdl_buf_##n,					\
		.read_buf = sdl_read_buf_##n,				\
	};								\
									\
	DEVICE_DT_INST_DEFINE(n, &sdl_display_init, NULL,		\
			      &sdl_data_##n,				\
			      &sdl_config_##n,				\
			      POST_KERNEL,				\
			      CONFIG_DISPLAY_INIT_PRIORITY,		\
			      &sdl_display_api);			\
									\
	static void sdl_display_cleanup_##n(void)			\
	{								\
		sdl_display_cleanup(&sdl_data_##n);			\
	}								\
									\
	NATIVE_TASK(sdl_display_cleanup_##n, ON_EXIT, 1);

DT_INST_FOREACH_STATUS_OKAY(DISPLAY_SDL_DEFINE)

static void display_sdl_native_posix_options(void)
{
	static struct args_struct_t sdl_display_options[] = {
		{ .option = "display_zoom_pct",
		  .name = "pct",
		  .type = 'u',
		  .dest = (void *)&sdl_display_zoom_pct,
		  .descript = "Display zoom percentage (100 == 1:1 scale), "
			      "by default " STRINGIFY(CONFIG_SDL_DISPLAY_ZOOM_PCT)
			      " = CONFIG_SDL_DISPLAY_ZOOM_PCT"
		},
		ARG_TABLE_ENDMARKER
	};

	native_add_command_line_opts(sdl_display_options);
}

NATIVE_TASK(display_sdl_native_posix_options, PRE_BOOT_1, 1);