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* 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((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(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((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 u8_t *)buf +
((h_idx * desc->pitch) + w_idx) * 3U;
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) <= (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 u8_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 & BIT(7-h_idx)) != 0U) {
pixel = one_color;
} else {
pixel = (~one_color) & 0x00FFFFFF;
}
*((u32_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 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((desc->pitch * 3U * desc->height) <= desc->buf_size,
"Input buffer to small");
return SDL_RenderReadPixels(disp_data->renderer, &rect, 0, buf,
desc->pitch * 4U);
}
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);
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