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/*
* Copyright 2024 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "screenshot.hpp"
#include <sys/_stdint.h>
#include <string>
#define LODEPNG_NO_COMPILE_CPP
#include "libs/lodepng/lodepng.h"
#include "esp_log.h"
#include "lvgl.h"
namespace ui {
[[maybe_unused]] static constexpr char kTag[] = "screenshot";
auto SaveScreenshot(lv_obj_t* obj, const std::string& path) -> void {
lv_draw_buf_t* buf = lv_snapshot_take(obj, LV_COLOR_FORMAT_RGB888);
if (!buf) {
return;
}
// LVGL appears to output BGR data instead. Not quite sure why, but swapping
// each pair is quite easy.
for (size_t i = 0; i < buf->data_size; i += 3) {
uint8_t temp = buf->data[i];
buf->data[i] = buf->data[i + 2];
buf->data[i + 2] = temp;
}
// The LVGL lodepng fork uses LVGL's file API, so an extra '/' is needed.
std::string fullpath = "//sd/" + path;
auto res = lodepng_encode_file(fullpath.c_str(), buf->data, buf->header.w,
buf->header.h, LCT_RGB, 8);
lv_draw_buf_destroy(buf);
if (res != 0) {
ESP_LOGE(kTag, "lodepng error: '%s'", lodepng_error_text(res));
}
}
} // namespace ui
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