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perf(l2): map tiles decode with PNGdec

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PNGdec (bitbank2, 1.1.6) decodes a tile a row at a time straight into
RGB565, without lodepng's 256 KB RGBA buffer; the trail overlay goes through
it too, blended by hand for palette-with-alpha and RGBA. It lives in its own
file (ui-lvgl/TilePng.cpp) because its zlib headers put DONE/EXTRA in the
global namespace. lodepng stays the fallback and the sim's decoder.

Same 20 tiles: decode 78 -> 50 ms, trails 42 -> 17.5 ms, a whole tile
170 -> 105 ms; the map with trails is pixel-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-09-30 08:53:15 +02:00
co-authored by Claude Opus 5.5
parent 039485bf34
commit f29c280c34
5 changed files with 116 additions and 15 deletions
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examples/companion_radio/ui-lvgl/MapScreen.h
+4 -3
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@@ -293,9 +293,10 @@ void UITask::perfMap(bool reset) {
while (s_cache.busy()) { delay(5); pollTiles(); } // a prefetch still decoding would share PSRAM with the drawing
Serial.printf("PERF tiles %lu decoded, avg %5.1f ms, max %5.1f ms (pending %d)\n", (unsigned long)s_perf_tile_n,
s_perf_tile_n ? s_perf_tile_us / 1000.0f / s_perf_tile_n : 0.0f, s_perf_tile_max / 1000.0f, (int)_map_pending);
if (s_perf_tile_n) Serial.printf("PERF of which read %5.1f ms (%lu B), decode %5.1f ms\n", s_raster.perf_read_us / 1000.0f / s_perf_tile_n,
(unsigned long)(s_raster.perf_bytes / s_perf_tile_n), s_raster.perf_dec_us / 1000.0f / s_perf_tile_n);
s_raster.perf_read_us = s_raster.perf_dec_us = s_raster.perf_bytes = 0;
if (s_perf_tile_n) Serial.printf("PERF of which read %5.1f ms (%lu B), decode %5.1f ms, trails %5.1f ms\n", s_raster.perf_read_us / 1000.0f / s_perf_tile_n,
(unsigned long)(s_raster.perf_bytes / s_perf_tile_n), s_raster.perf_dec_us / 1000.0f / s_perf_tile_n,
s_raster.perf_ovl_us / 1000.0f / s_perf_tile_n);
s_raster.perf_read_us = s_raster.perf_dec_us = s_raster.perf_bytes = s_raster.perf_ovl_us = 0;
uint32_t fl0 = lvport::s_flush_us, t = micros();
for (int i = 0; i < 20; i++) { // a drag: 4 px a frame, tiles already decoded
_map_cx += (i < 10 ? 4.0 : -4.0) / TILE_PX;