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perf(l2): screen sent by DMA while the next part is drawn

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The panel takes each 24-line band by DMA while LVGL draws the next one
into the other buffer (two 15 KB buffers in internal RAM; LovyanGFX's
4092-byte DMA descriptors leave PSRAM unaligned for the S3's DMA, which
showed as shifted and smeared bands). LVGL draws in the panel's byte
order, and so do map tiles and the frozen screen under a popup, so
nothing is swapped on the way out. Full frames ~10-25% faster (page1
19.9 -> 14.7 ms, Home 21.4 -> 18.2 ms). Without the internal RAM the
screen is sent as before. The arduino2 env keeps the old way.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-10-01 20:56:13 +02:00
co-authored by Claude Opus 5.5
parent ca5e66a4a1
commit 0a07dc3deb
5 changed files with 123 additions and 15 deletions
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examples/companion_radio/ui-lvgl/UITask.cpp
+12 -2
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@@ -322,16 +322,26 @@ namespace freeze {
s_retry = nullptr;
take((lv_obj_t*)lv_timer_get_user_data(t));
}
// Darkened into the display's own byte order (UI_FLUSH_DMA: big-endian;
// lv_snapshot can't make that one itself): drawn then as a plain copy.
#ifdef UI_FLUSH_DMA
static inline uint16_t out565(uint16_t c) { return __builtin_bswap16(c); }
#else
static inline uint16_t out565(uint16_t c) { return c; }
#endif
static void darken(lv_draw_buf_t* buf) { // as the dim layer over it would
const uint32_t keep = 256 - s_dim; // what's left under the black
for (uint32_t y = 0; y < buf->header.h; y++) {
uint16_t* p = (uint16_t*)(buf->data + y * buf->header.stride);
for (uint32_t x = 0; x < buf->header.w; x++) {
uint32_t c = p[x];
p[x] = (uint16_t)(((((c >> 11) * keep) >> 8) << 11) | (((((c >> 5) & 0x3F) * keep) >> 8) << 5) |
(((c & 0x1F) * keep) >> 8));
p[x] = out565((uint16_t)(((((c >> 11) * keep) >> 8) << 11) | (((((c >> 5) & 0x3F) * keep) >> 8) << 5) |
(((c & 0x1F) * keep) >> 8)));
}
}
#ifdef UI_FLUSH_DMA
buf->header.cf = LV_COLOR_FORMAT_RGB565_SWAPPED;
#endif
}
static lv_draw_buf_t* snap(lv_obj_t* overlay, lv_obj_t* scr, bool top) {
if (!top) lv_obj_add_flag(overlay, LV_OBJ_FLAG_HIDDEN);