Sternenlabor/WLED
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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 fbbf2d5eb3
commit 42b247756a
2 changed files with 32 additions and 22 deletions
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35
wled00/FX_2Dfcn.cpp
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@@ -306,6 +306,7 @@ void Segment::blendPixelColorXY(uint16_t x, uint16_t y, uint32_t color, uint8_t
// Adds the specified color with the existing pixel color perserving color balance.
void Segment::addPixelColorXY(int x, int y, uint32_t color, bool fast) {
if (x >= virtualWidth() || y >= virtualHeight() || x<0 || y<0) return; // if pixel would fall out of virtual segment just exit
uint32_t col = getPixelColorXY(x,y);
uint8_t r = R(col);
uint8_t g = G(col);
@@ -330,50 +331,54 @@ void Segment::fadePixelColorXY(uint16_t x, uint16_t y, uint8_t fade) {
// blurRow: perform a blur on a row of a rectangular matrix
void Segment::blurRow(uint16_t row, fract8 blur_amount) {
const uint16_t cols = virtualWidth();
const uint16_t rows = virtualHeight();
const uint_fast16_t cols = virtualWidth();
const uint_fast16_t rows = virtualHeight();
if (row >= rows) return;
// blur one row
uint8_t keep = 255 - blur_amount;
uint8_t seep = blur_amount >> 1;
CRGB carryover = CRGB::Black;
for (uint16_t x = 0; x < cols; x++) {
for (uint_fast16_t x = 0; x < cols; x++) {
CRGB cur = getPixelColorXY(x, row);
uint32_t before = uint32_t(cur); // remember color before blur
CRGB part = cur;
part.nscale8(seep);
cur.nscale8(keep);
cur += carryover;
if (x) {
if (x>0) {
CRGB prev = CRGB(getPixelColorXY(x-1, row)) + part;
setPixelColorXY(x-1, row, prev);
}
setPixelColorXY(x, row, cur);
if (before != uint32_t(cur)) // optimization: only set pixel if color has changed
setPixelColorXY(x, row, cur);
carryover = part;
}
}
// blurCol: perform a blur on a column of a rectangular matrix
void Segment::blurCol(uint16_t col, fract8 blur_amount) {
const uint16_t cols = virtualWidth();
const uint16_t rows = virtualHeight();
const uint_fast16_t cols = virtualWidth();
const uint_fast16_t rows = virtualHeight();
if (col >= cols) return;
// blur one column
uint8_t keep = 255 - blur_amount;
uint8_t seep = blur_amount >> 1;
CRGB carryover = CRGB::Black;
for (uint16_t i = 0; i < rows; i++) {
CRGB cur = getPixelColorXY(col, i);
for (uint_fast16_t y = 0; y < rows; y++) {
CRGB cur = getPixelColorXY(col, y);
CRGB part = cur;
uint32_t before = uint32_t(cur); // remember color before blur
part.nscale8(seep);
cur.nscale8(keep);
cur += carryover;
if (i) {
CRGB prev = CRGB(getPixelColorXY(col, i-1)) + part;
setPixelColorXY(col, i-1, prev);
if (y>0) {
CRGB prev = CRGB(getPixelColorXY(col, y-1)) + part;
setPixelColorXY(col, y-1, prev);
}
setPixelColorXY(col, i, cur);
if (before != uint32_t(cur)) // optimization: only set pixel if color has changed
setPixelColorXY(col, y, cur);
carryover = part;
}
}
@@ -392,8 +397,8 @@ void Segment::box_blur(uint16_t i, bool vertical, fract8 blur_amount) {
for (uint16_t j = 0; j < dim1; j++) {
uint16_t x = vertical ? i : j;
uint16_t y = vertical ? j : i;
uint16_t xp = vertical ? x : x-1;
uint16_t yp = vertical ? y-1 : y;
int16_t xp = vertical ? x : x-1; // "signed" to prevent underflow
int16_t yp = vertical ? y-1 : y; // "signed" to prevent underflow
uint16_t xn = vertical ? x : x+1;
uint16_t yn = vertical ? y+1 : y;
CRGB curr = getPixelColorXY(x,y);