Jan/WLED_MM_Infinity
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blur speedup

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it seems that SEGMENT.blur() is the main bottleneck for many 2D effects.

This change optimizes performance of the function:
* avoid to re-write unchanged pixels
* early exit when blur_amount == 0 (=nothing to do)
* use _fast_ types where possible

I've seen up to 20% speedup with this change.
This commit is contained in:
Frank
2023-07-06 19:51:37 +02:00
parent a2e2eada1b
commit a45306b141
2 changed files with 25 additions and 18 deletions
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8
wled00/FX_fcn.cpp
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@@ -1208,6 +1208,7 @@ void Segment::fade_out(uint8_t rate) {
// fades all pixels to black using nscale8()
void Segment::fadeToBlackBy(uint8_t fadeBy) {
if (fadeBy == 0) return; // optimization - no scaling to apply
const uint_fast16_t cols = is2D() ? virtualWidth() : virtualLength(); // WLEDMM use fast int types
const uint_fast16_t rows = virtualHeight(); // will be 1 for 1D
const uint_fast8_t scaledown = 255-fadeBy; // WLEDMM faster to pre-compute this
@@ -1229,10 +1230,11 @@ void Segment::fadeToBlackBy(uint8_t fadeBy) {
*/
void Segment::blur(uint8_t blur_amount)
{
if (blur_amount == 0) return; // optimization: 0 means "don't blur"
#ifndef WLED_DISABLE_2D
if (is2D()) {
// compatibility with 2D
const uint_fast16_t cols = virtualWidth(); // WLEDMM use fast int types
const uint_fast16_t cols = virtualWidth();
const uint_fast16_t rows = virtualHeight();
for (uint_fast16_t i = 0; i < rows; i++) blurRow(i, blur_amount); // blur all rows
for (uint_fast16_t k = 0; k < cols; k++) blurCol(k, blur_amount); // blur all columns
@@ -1247,7 +1249,7 @@ void Segment::blur(uint8_t blur_amount)
{
CRGB cur = CRGB(getPixelColor(i));
CRGB part = cur;
CRGB before = cur; // WLEDMM
uint32_t before = uint32_t(cur); // remember color before blur
part.nscale8(seep);
cur.nscale8(keep);
cur += carryover;
@@ -1258,7 +1260,7 @@ void Segment::blur(uint8_t blur_amount)
uint8_t b = B(c);
setPixelColor((uint16_t)(i-1), qadd8(r, part.red), qadd8(g, part.green), qadd8(b, part.blue));
}
if (before != cur) // WLEDMM optimization: don't write same color again
if (before != uint32_t(cur)) // optimization: only set pixel if color has changed
setPixelColor((uint16_t)i,cur.red, cur.green, cur.blue);
carryover = part;
}