drivers/display/display_sdl.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

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

 #include <display.h>

 #include <SDL.h>
 #include <string.h>
 #include <soc.h>

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

 struct sdl_display_data {
 	SDL_Window *window;
 	SDL_Renderer *renderer;
 	SDL_Texture *texture;
 	bool display_on;
 	enum display_pixel_format current_pixel_format;
 	u8_t buf[4 * CONFIG_SDL_DISPLAY_X_RES * CONFIG_SDL_DISPLAY_Y_RES];
 };

 static struct sdl_display_data sdl_display_data;

 static int sdl_display_init(struct device *dev)
 {
 	struct sdl_display_data *disp_data =
 	    (struct sdl_display_data *)dev->driver_data;
 	LOG_DBG("Initializing display driver");

 	memset(disp_data, 0, sizeof(struct sdl_display_data));

 	disp_data->current_pixel_format = PIXEL_FORMAT_ARGB_8888;

 	disp_data->window =
 	    SDL_CreateWindow("Zephyr Display", SDL_WINDOWPOS_UNDEFINED,
 			     SDL_WINDOWPOS_UNDEFINED, CONFIG_SDL_DISPLAY_X_RES,
 			     CONFIG_SDL_DISPLAY_Y_RES, SDL_WINDOW_SHOWN);
 	if (disp_data->window == NULL) {
 		LOG_ERR("Failed to create SDL window: %s", SDL_GetError());
 		return -EIO;
 	}

 	disp_data->renderer =
 	    SDL_CreateRenderer(disp_data->window, -1, SDL_RENDERER_ACCELERATED);
 	if (disp_data->renderer == NULL) {
 		LOG_ERR("Failed to create SDL renderer: %s",
 			    SDL_GetError());
 		return -EIO;
 	}

 	disp_data->texture = SDL_CreateTexture(
 	    disp_data->renderer, SDL_PIXELFORMAT_ARGB8888,
 	    SDL_TEXTUREACCESS_STATIC, CONFIG_SDL_DISPLAY_X_RES,
 	    CONFIG_SDL_DISPLAY_Y_RES);
 	if (disp_data->texture == NULL) {
 		LOG_ERR("Failed to create SDL texture: %s", SDL_GetError());
 		return -EIO;
 	}

 	disp_data->display_on = false;
 	SDL_SetRenderDrawColor(disp_data->renderer, 0, 0, 0, 0xFF);
 	SDL_RenderClear(disp_data->renderer);
 	SDL_RenderPresent(disp_data->renderer);

 	return 0;
 }

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

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

 static void sdl_display_write_rgb888(u8_t *disp_buf,
 		const struct display_buffer_descriptor *desc, const void *buf)
 {
 	u32_t w_idx;
 	u32_t h_idx;
 	u32_t pixel;
 	const u8_t *byte_ptr;

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

 	for (h_idx = 0; h_idx < desc->height; ++h_idx) {
 		for (w_idx = 0; w_idx < desc->width; ++w_idx) {
 			byte_ptr = (const u8_t *)buf +
 				3 * ((h_idx * desc->pitch) + w_idx);
 			pixel = *byte_ptr << 16;
 			pixel |= *(byte_ptr + 1) << 8;
 			pixel |= *(byte_ptr + 2);
 			*((u32_t *)disp_buf) = pixel;
 			disp_buf += 4;
 		}
 	}
 }

 static void sdl_display_write_mono(u8_t *disp_buf,
 		const struct display_buffer_descriptor *desc, const void *buf,
 		const bool one_is_black)
 {
 	u32_t w_idx;
 	u32_t h_idx;
 	u32_t tile_idx;
 	u32_t pixel;
 	const u8_t *byte_ptr;
 	u32_t one_color;
 	u8_t *disp_buf_start;

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

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

 	for (tile_idx = 0; tile_idx < desc->height/8; ++tile_idx) {
 		for (w_idx = 0; w_idx < desc->width; ++w_idx) {
 			byte_ptr = (const u8_t *)buf +
 				((tile_idx * desc->pitch) + w_idx);
 			disp_buf_start = disp_buf;
 			for (h_idx = 0; h_idx < 8; ++h_idx) {
 				if ((*byte_ptr & BIT(7-h_idx)) != 0)  {
 					pixel = one_color;
 				} else {
 					pixel = (~one_color) & 0x00FFFFFF;
 				}
 				*((u32_t *)disp_buf) = pixel;
 				disp_buf += (4 * desc->width);
 			}
 			disp_buf = disp_buf_start;
 			disp_buf += 4;
 		}
 		disp_buf += 7 * (4 * desc->width);
 	}
 }

 static int sdl_display_write(const struct device *dev, const u16_t x,
 			     const u16_t y,
 			     const struct display_buffer_descriptor *desc,
 			     const void *buf)
 {
 	SDL_Rect rect;

 	struct sdl_display_data *disp_data =
 		(struct sdl_display_data *)dev->driver_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");

 	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);
 	}

 	rect.x = x;
 	rect.y = y;
 	rect.w = desc->width;
 	rect.h = desc->height;

 	SDL_UpdateTexture(disp_data->texture, &rect, disp_data->buf,
 			4 * rect.w);

 	if (disp_data->display_on) {
 		SDL_RenderClear(disp_data->renderer);
 		SDL_RenderCopy(disp_data->renderer, disp_data->texture, NULL,
 				NULL);
 		SDL_RenderPresent(disp_data->renderer);
 	}

 	return 0;
 }

 static int sdl_display_read(const struct device *dev, const u16_t x,
 			    const u16_t y,
 			    const struct display_buffer_descriptor *desc,
 			    void *buf)
 {
 	struct sdl_display_data *disp_data =
 		(struct sdl_display_data *)dev->driver_data;
 	SDL_Rect rect;

 	rect.x = x;
 	rect.y = y;
 	rect.w = desc->width;
 	rect.h = desc->height;

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

 	return SDL_RenderReadPixels(disp_data->renderer, &rect, 0, buf,
 			4 * desc->pitch);
 }

 static void *sdl_display_get_framebuffer(const struct device *dev)
 {
 	return NULL;
 }

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

 	LOG_DBG("Turning display blacking off");

 	disp_data->display_on = true;

 	SDL_RenderClear(disp_data->renderer);
 	SDL_RenderCopy(disp_data->renderer, disp_data->texture, NULL, NULL);
 	SDL_RenderPresent(disp_data->renderer);

 	return 0;
 }

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

 	LOG_DBG("Turning display blanking on");

 	disp_data->display_on = false;

 	SDL_RenderClear(disp_data->renderer);
 	SDL_RenderPresent(disp_data->renderer);
 	return 0;
 }

 static int sdl_display_set_brightness(const struct device *dev,
 		const u8_t brightness)
 {
 	return -ENOTSUP;
 }

 static int sdl_display_set_contrast(const struct device *dev,
 		const u8_t contrast)
 {
 	return -ENOTSUP;
 }

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

 	memset(capabilities, 0, sizeof(struct display_capabilities));
 	capabilities->x_resolution = CONFIG_SDL_DISPLAY_X_RES;
 	capabilities->y_resolution = CONFIG_SDL_DISPLAY_Y_RES;
 	capabilities->supported_pixel_formats = PIXEL_FORMAT_ARGB_8888 |
 		PIXEL_FORMAT_RGB_888 |
 		PIXEL_FORMAT_MONO01 |
 		PIXEL_FORMAT_MONO10;
 	capabilities->current_pixel_format = disp_data->current_pixel_format;
 	capabilities->screen_info = SCREEN_INFO_MONO_VTILED |
 		SCREEN_INFO_MONO_MSB_FIRST;
 }

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

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

 static void sdl_display_cleanup(void)
 {
 	if (sdl_display_data.texture != NULL) {
 		SDL_DestroyTexture(sdl_display_data.texture);
 		sdl_display_data.texture = NULL;
 	}

 	if (sdl_display_data.renderer != NULL) {
 		SDL_DestroyRenderer(sdl_display_data.renderer);
 		sdl_display_data.renderer = NULL;
 	}

 	if (sdl_display_data.window != NULL) {
 		SDL_DestroyWindow(sdl_display_data.window);
 		sdl_display_data.window = NULL;
 	}
 }

 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_framebuffer = sdl_display_get_framebuffer,
 	.set_brightness = sdl_display_set_brightness,
 	.set_contrast = sdl_display_set_contrast,
 	.get_capabilities = sdl_display_get_capabilities,
 	.set_pixel_format = sdl_display_set_pixel_format,
 };

 DEVICE_AND_API_INIT(sdl_display, CONFIG_SDL_DISPLAY_DEV_NAME, &sdl_display_init,
 		    &sdl_display_data, NULL, APPLICATION,
 		    CONFIG_APPLICATION_INIT_PRIORITY, &sdl_display_api);


 NATIVE_TASK(sdl_display_cleanup, ON_EXIT, 1);
	/*
	* Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <display.h>

	#include <SDL.h>
	#include <string.h>
	#include <soc.h>

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

	struct sdl_display_data {
	SDL_Window *window;
	SDL_Renderer *renderer;
	SDL_Texture *texture;
	bool display_on;
	enum display_pixel_format current_pixel_format;
	u8_t buf[4 * CONFIG_SDL_DISPLAY_X_RES * CONFIG_SDL_DISPLAY_Y_RES];
	};

	static struct sdl_display_data sdl_display_data;

	static int sdl_display_init(struct device *dev)
	{
	struct sdl_display_data *disp_data =
	(struct sdl_display_data *)dev->driver_data;
	LOG_DBG("Initializing display driver");

	memset(disp_data, 0, sizeof(struct sdl_display_data));

	disp_data->current_pixel_format = PIXEL_FORMAT_ARGB_8888;

	disp_data->window =
	SDL_CreateWindow("Zephyr Display", SDL_WINDOWPOS_UNDEFINED,
	SDL_WINDOWPOS_UNDEFINED, CONFIG_SDL_DISPLAY_X_RES,
	CONFIG_SDL_DISPLAY_Y_RES, SDL_WINDOW_SHOWN);
	if (disp_data->window == NULL) {
	LOG_ERR("Failed to create SDL window: %s", SDL_GetError());
	return -EIO;
	}

	disp_data->renderer =
	SDL_CreateRenderer(disp_data->window, -1, SDL_RENDERER_ACCELERATED);
	if (disp_data->renderer == NULL) {
	LOG_ERR("Failed to create SDL renderer: %s",
	SDL_GetError());
	return -EIO;
	}

	disp_data->texture = SDL_CreateTexture(
	disp_data->renderer, SDL_PIXELFORMAT_ARGB8888,
	SDL_TEXTUREACCESS_STATIC, CONFIG_SDL_DISPLAY_X_RES,
	CONFIG_SDL_DISPLAY_Y_RES);
	if (disp_data->texture == NULL) {
	LOG_ERR("Failed to create SDL texture: %s", SDL_GetError());
	return -EIO;
	}

	disp_data->display_on = false;
	SDL_SetRenderDrawColor(disp_data->renderer, 0, 0, 0, 0xFF);
	SDL_RenderClear(disp_data->renderer);
	SDL_RenderPresent(disp_data->renderer);

	return 0;
	}

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

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

	static void sdl_display_write_rgb888(u8_t *disp_buf,
	const struct display_buffer_descriptor desc, const void buf)
	{
	u32_t w_idx;
	u32_t h_idx;
	u32_t pixel;
	const u8_t *byte_ptr;

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

	for (h_idx = 0; h_idx < desc->height; ++h_idx) {
	for (w_idx = 0; w_idx < desc->width; ++w_idx) {
	byte_ptr = (const u8_t *)buf +
	3 * ((h_idx * desc->pitch) + w_idx);
	pixel = *byte_ptr << 16;
	pixel \|= *(byte_ptr + 1) << 8;
	pixel \|= *(byte_ptr + 2);
	((u32_t )disp_buf) = pixel;
	disp_buf += 4;
	}
	}
	}

	static void sdl_display_write_mono(u8_t *disp_buf,
	const struct display_buffer_descriptor desc, const void buf,
	const bool one_is_black)
	{
	u32_t w_idx;
	u32_t h_idx;
	u32_t tile_idx;
	u32_t pixel;
	const u8_t *byte_ptr;
	u32_t one_color;
	u8_t *disp_buf_start;

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

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

	for (tile_idx = 0; tile_idx < desc->height/8; ++tile_idx) {
	for (w_idx = 0; w_idx < desc->width; ++w_idx) {
	byte_ptr = (const u8_t *)buf +
	((tile_idx * desc->pitch) + w_idx);
	disp_buf_start = disp_buf;
	for (h_idx = 0; h_idx < 8; ++h_idx) {
	if ((*byte_ptr & BIT(7-h_idx)) != 0) {
	pixel = one_color;
	} else {
	pixel = (~one_color) & 0x00FFFFFF;
	}
	((u32_t )disp_buf) = pixel;
	disp_buf += (4 * desc->width);
	}
	disp_buf = disp_buf_start;
	disp_buf += 4;
	}
	disp_buf += 7 * (4 * desc->width);
	}
	}

	static int sdl_display_write(const struct device *dev, const u16_t x,
	const u16_t y,
	const struct display_buffer_descriptor *desc,
	const void *buf)
	{
	SDL_Rect rect;

	struct sdl_display_data *disp_data =
	(struct sdl_display_data *)dev->driver_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");

	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);
	}

	rect.x = x;
	rect.y = y;
	rect.w = desc->width;
	rect.h = desc->height;

	SDL_UpdateTexture(disp_data->texture, &rect, disp_data->buf,
	4 * rect.w);

	if (disp_data->display_on) {
	SDL_RenderClear(disp_data->renderer);
	SDL_RenderCopy(disp_data->renderer, disp_data->texture, NULL,
	NULL);
	SDL_RenderPresent(disp_data->renderer);
	}

	return 0;
	}

	static int sdl_display_read(const struct device *dev, const u16_t x,
	const u16_t y,
	const struct display_buffer_descriptor *desc,
	void *buf)
	{
	struct sdl_display_data *disp_data =
	(struct sdl_display_data *)dev->driver_data;
	SDL_Rect rect;

	rect.x = x;
	rect.y = y;
	rect.w = desc->width;
	rect.h = desc->height;

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

	return SDL_RenderReadPixels(disp_data->renderer, &rect, 0, buf,
	4 * desc->pitch);
	}

	static void sdl_display_get_framebuffer(const struct device dev)
	{
	return NULL;
	}

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

	LOG_DBG("Turning display blacking off");

	disp_data->display_on = true;

	SDL_RenderClear(disp_data->renderer);
	SDL_RenderCopy(disp_data->renderer, disp_data->texture, NULL, NULL);
	SDL_RenderPresent(disp_data->renderer);

	return 0;
	}

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

	LOG_DBG("Turning display blanking on");

	disp_data->display_on = false;

	SDL_RenderClear(disp_data->renderer);
	SDL_RenderPresent(disp_data->renderer);
	return 0;
	}

	static int sdl_display_set_brightness(const struct device *dev,
	const u8_t brightness)
	{
	return -ENOTSUP;
	}

	static int sdl_display_set_contrast(const struct device *dev,
	const u8_t contrast)
	{
	return -ENOTSUP;
	}

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

	memset(capabilities, 0, sizeof(struct display_capabilities));
	capabilities->x_resolution = CONFIG_SDL_DISPLAY_X_RES;
	capabilities->y_resolution = CONFIG_SDL_DISPLAY_Y_RES;
	capabilities->supported_pixel_formats = PIXEL_FORMAT_ARGB_8888 \|
	PIXEL_FORMAT_RGB_888 \|
	PIXEL_FORMAT_MONO01 \|
	PIXEL_FORMAT_MONO10;
	capabilities->current_pixel_format = disp_data->current_pixel_format;
	capabilities->screen_info = SCREEN_INFO_MONO_VTILED \|
	SCREEN_INFO_MONO_MSB_FIRST;
	}

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

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

	static void sdl_display_cleanup(void)
	{
	if (sdl_display_data.texture != NULL) {
	SDL_DestroyTexture(sdl_display_data.texture);
	sdl_display_data.texture = NULL;
	}

	if (sdl_display_data.renderer != NULL) {
	SDL_DestroyRenderer(sdl_display_data.renderer);
	sdl_display_data.renderer = NULL;
	}

	if (sdl_display_data.window != NULL) {
	SDL_DestroyWindow(sdl_display_data.window);
	sdl_display_data.window = NULL;
	}
	}

	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_framebuffer = sdl_display_get_framebuffer,
	.set_brightness = sdl_display_set_brightness,
	.set_contrast = sdl_display_set_contrast,
	.get_capabilities = sdl_display_get_capabilities,
	.set_pixel_format = sdl_display_set_pixel_format,
	};

	DEVICE_AND_API_INIT(sdl_display, CONFIG_SDL_DISPLAY_DEV_NAME, &sdl_display_init,
	&sdl_display_data, NULL, APPLICATION,
	CONFIG_APPLICATION_INIT_PRIORITY, &sdl_display_api);


	NATIVE_TASK(sdl_display_cleanup, ON_EXIT, 1);