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Feature/cover crop mode (#225)

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Added a setting to select `fit` or `crop` for cover image on sleep
screen.

Might add a `expand` feature in the future that does not crop but rather
fills the blank space with a mirror of the image.

---------

Co-authored-by: Dave Allie <dave@daveallie.com>
This commit is contained in:
Jonas Diemer
2026-01-05 11:07:27 +01:00
committed by GitHub
parent 9f95b31de5
commit afe9672156
9 changed files with 70 additions and 37 deletions
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17
lib/GfxRenderer/Bitmap.cpp
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@@ -250,34 +250,29 @@ BmpReaderError Bitmap::parseHeaders() {
delete[] errorNextRow;
errorCurRow = new int16_t[width + 2](); // +2 for boundary handling
errorNextRow = new int16_t[width + 2]();
lastRowY = -1;
prevRowY = -1;
}
return BmpReaderError::Ok;
}
// packed 2bpp output, 0 = black, 1 = dark gray, 2 = light gray, 3 = white
BmpReaderError Bitmap::readRow(uint8_t* data, uint8_t* rowBuffer, int rowY) const {
BmpReaderError Bitmap::readNextRow(uint8_t* data, uint8_t* rowBuffer) const {
// Note: rowBuffer should be pre-allocated by the caller to size 'rowBytes'
if (file.read(rowBuffer, rowBytes) != rowBytes) return BmpReaderError::ShortReadRow;
// Handle Floyd-Steinberg error buffer progression
const bool useFS = USE_FLOYD_STEINBERG && errorCurRow && errorNextRow;
if (useFS) {
// Check if we need to advance to next row (or reset if jumping)
if (rowY != lastRowY + 1 && rowY != 0) {
// Non-sequential row access - reset error buffers
memset(errorCurRow, 0, (width + 2) * sizeof(int16_t));
memset(errorNextRow, 0, (width + 2) * sizeof(int16_t));
} else if (rowY > 0) {
if (prevRowY != -1) {
// Sequential access - swap buffers
int16_t* temp = errorCurRow;
errorCurRow = errorNextRow;
errorNextRow = temp;
memset(errorNextRow, 0, (width + 2) * sizeof(int16_t));
}
lastRowY = rowY;
}
prevRowY += 1;
uint8_t* outPtr = data;
uint8_t currentOutByte = 0;
@@ -292,7 +287,7 @@ BmpReaderError Bitmap::readRow(uint8_t* data, uint8_t* rowBuffer, int rowY) cons
color = quantizeFloydSteinberg(lum, currentX, width, errorCurRow, errorNextRow, false);
} else {
// Simple quantization or noise dithering
color = quantize(lum, currentX, rowY);
color = quantize(lum, currentX, prevRowY);
}
currentOutByte |= (color << bitShift);
if (bitShift == 0) {
@@ -365,7 +360,7 @@ BmpReaderError Bitmap::rewindToData() const {
if (USE_FLOYD_STEINBERG && errorCurRow && errorNextRow) {
memset(errorCurRow, 0, (width + 2) * sizeof(int16_t));
memset(errorNextRow, 0, (width + 2) * sizeof(int16_t));
lastRowY = -1;
prevRowY = -1;
}
return BmpReaderError::Ok;