Skip to content

Update pixel buffer after changing matrix dimensions #5675

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
DedeHai wants to merge 2 commits into
base: main
Choose a base branch
from
+15 −3
Open

Update pixel buffer after changing matrix dimensions #5675

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
b60cf6b
update pixel buffer after changing matrix dimensions
DedeHai Jun 8, 2026
dfc4a33
remove commented line
DedeHai Jun 8, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions wled00/FX.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -879,6 +879,7 @@ class WS2812FX {
printSize(), // prints memory usage for strip components
#endif
finalizeInit(), // initialises strip components
updatePixelBuffer(), // (re)allocate memory for _pixels[]
service(), // executes effect functions when due and calls strip.show()
setCCT(uint16_t k), // sets global CCT (either in relative 0-255 value or in K)
setBrightness(uint8_t b, bool direct = false), // sets strip brightness
Expand Down
17 changes: 14 additions & 3 deletions wled00/FX_fcn.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1272,11 +1272,17 @@ void WS2812FX::finalizeInit() {
deserializeMap(); // (re)load default ledmap (will also setUpMatrix() if ledmap does not exist)

// allocate frame buffer after matrix has been set up (gaps!)
updatePixelBuffer();
DEBUG_PRINTF_P(PSTR("Heap after strip init: %uB\n"), getFreeHeapSize());
}

// update global _pixels[] buffer to match getLengthTotal() note: if allocation fails, WLED will not render anything
void WS2812FX::updatePixelBuffer() {
uint32_t requiredMem = getLengthTotal() * sizeof(uint32_t);
p_free(_pixels); // using realloc on large buffers can cause additional fragmentation instead of reducing it
// use PSRAM if available: there is no measurable perfomance impact between PSRAM and DRAM on S2/S3 with QSPI PSRAM for this buffer
_pixels = static_cast<uint32_t*>(allocate_buffer(getLengthTotal() * sizeof(uint32_t), BFRALLOC_ENFORCE_PSRAM | BFRALLOC_NOBYTEACCESS | BFRALLOC_CLEAR));
DEBUG_PRINTF_P(PSTR("strip buffer size: %uB\n"), getLengthTotal() * sizeof(uint32_t));
DEBUG_PRINTF_P(PSTR("Heap after strip init: %uB\n"), getFreeHeapSize());
_pixels = static_cast<uint32_t*>(allocate_buffer(requiredMem, BFRALLOC_ENFORCE_PSRAM | BFRALLOC_NOBYTEACCESS | BFRALLOC_CLEAR));
Comment thread
coderabbitai[bot] marked this conversation as resolved.
DEBUG_PRINTF_P(PSTR("strip buffer size: %uB\n"), requiredMem);
}

void WS2812FX::service() {
Expand Down Expand Up @@ -2080,10 +2086,13 @@ bool WS2812FX::deserializeMap(unsigned n) {
customMappingSize = 0; // prevent use of mapping if anything goes wrong
currentLedmap = 0;
if (n == 0 || isFile) interfaceUpdateCallMode = CALL_MODE_WS_SEND; // schedule WS update (to inform UI)
uint32_t lengthTotalBefore = strip.getLengthTotal();

if (!isFile && n==0 && isMatrix) {
// 2D panel support creates its own ledmap (on the fly) if a ledmap.json does not exist
setUpMatrix();
if (strip.getLengthTotal() != lengthTotalBefore)
strip.updatePixelBuffer(); // allocate _pixels[] to match new length
return false;
}

Expand Down Expand Up @@ -2158,6 +2167,8 @@ bool WS2812FX::deserializeMap(unsigned n) {
}

releaseJSONBufferLock();
if (strip.getLengthTotal() != lengthTotalBefore)
strip.updatePixelBuffer(); // allocate _pixels[] to match new length
return (customMappingSize > 0);
}

Expand Down
Loading