Dawie_Personal/Wled_Fan_Controller
1
0
Fork 0
Code Issues Pull Requests Actions 2 Packages Projects Releases Wiki Activity

add comment to explain coordinate packing logic

Browse Source
This commit is contained in:
Frank 2025-11-14 01:08:48 +01:00
parent 79376bbc58
commit fc776eeb16
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
wled00/image_loader.cpp
View File

@ -85,6 +85,7 @@ void drawPixelCallback2D(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8
// simple nearest-neighbor scaling // simple nearest-neighbor scaling
int outY = (int)y * activeSeg->vHeight() / gifHeight; int outY = (int)y * activeSeg->vHeight() / gifHeight;
int outX = (int)x * activeSeg->vWidth() / gifWidth; int outX = (int)x * activeSeg->vWidth() / gifWidth;
// Pack coordinates uniquely: outY into upper 16 bits, outX into lower 16 bits
if (((outY << 16) | outX) == lastCoordinate) return; // skip setting same coordinate again if (((outY << 16) | outX) == lastCoordinate) return; // skip setting same coordinate again
lastCoordinate = (outY << 16) | outX; // since input is a "scanline" this is sufficient to identify a "unique" coordinate lastCoordinate = (outY << 16) | outX; // since input is a "scanline" this is sufficient to identify a "unique" coordinate
// set multiple pixels if upscaling // set multiple pixels if upscaling