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[lvgl] Fix crash with snow on rotated display (#15822)

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This commit is contained in:
Clyde Stubbs
2026-04-18 09:17:28 +10:00
committed by Jesse Hills
parent e2dfef5ddc
commit 6d5340f253
1 changed files with 11 additions and 9 deletions
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20
esphome/components/lvgl/lvgl_esphome.cpp
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@@ -642,26 +642,28 @@ void LvglComponent::write_random_() {
int iterations = 6 - lv_display_get_inactive_time(this->disp_) / 60000;
if (iterations <= 0)
iterations = 1;
int16_t width = lv_display_get_horizontal_resolution(this->disp_);
int16_t height = lv_display_get_vertical_resolution(this->disp_);
while (iterations-- != 0) {
int32_t col = random_uint32() % this->width_;
int32_t col = random_uint32() % width;
col = col / this->draw_rounding * this->draw_rounding;
int32_t row = random_uint32() % this->height_;
int32_t row = random_uint32() % height;
row = row / this->draw_rounding * this->draw_rounding;
// size will be between 8 and 32, and a multiple of draw_rounding
int32_t size = (random_uint32() % 25 + 8) / this->draw_rounding * this->draw_rounding;
lv_area_t area{col, row, col + size - 1, row + size - 1};
lv_area_t area{.x1 = col, .y1 = row, .x2 = col + size - 1, .y2 = row + size - 1};
// clip to display bounds just in case
if (area.x2 >= this->width_)
area.x2 = this->width_ - 1;
if (area.y2 >= this->height_)
area.y2 = this->height_ - 1;
if (area.x2 >= width)
area.x2 = width - 1;
if (area.y2 >= height)
area.y2 = height - 1;
// line_len can't exceed 1024, and minimum buffer size is 2048, so this won't overflow the buffer
size_t line_len = lv_area_get_width(&area) * lv_area_get_height(&area) / 2;
for (size_t i = 0; i != line_len; i++) {
((uint32_t *) (this->draw_buf_))[i] = random_uint32();
reinterpret_cast<uint32_t *>(this->draw_buf_)[i] = random_uint32();
}
this->draw_buffer_(&area, (lv_color_data *) this->draw_buf_);
this->draw_buffer_(&area, reinterpret_cast<lv_color_data *>(this->draw_buf_));
}
}