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consider bitsremain == 0

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This commit is contained in:
Manuel
2025-10-30 13:43:26 +01:00
parent 4393356ad4
commit 9dd5487ba3
1 changed files with 3 additions and 6 deletions
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9
src/graphics/EInkParallelDisplay.cpp
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@@ -100,15 +100,12 @@ void EInkParallelDisplay::display(void)
for (uint32_t y = 0; y < h; ++y) {
const uint32_t base = (y >> 3) * w; // (y/8) * width
const uint8_t bitMask = (uint8_t)(1u << (y & 7)); // mask for this row in vertical-byte layout
const uint32_t rowBase = y * rowBytes;
uint32_t xb = 0;
// process full 8-pixel bytes
for (; xb + 1 <= rowBytes; ++xb) {
for (uint32_t xb = 0; xb < rowBytes; ++xb) {
uint32_t x0 = xb * 8;
// read up to 8 source bytes (vertical-byte per column)
// Be careful at the row end: we may read beyond width; handle mask later.
uint8_t b0 = (x0 + 0 < w) ? buffer[base + x0 + 0] : 0;
uint8_t b1 = (x0 + 1 < w) ? buffer[base + x0 + 1] : 0;
uint8_t b2 = (x0 + 2 < w) ? buffer[base + x0 + 2] : 0;
@@ -131,8 +128,8 @@ void EInkParallelDisplay::display(void)
// handle partial byte at end of row by masking off invalid bits
uint8_t mask = 0xFF;
uint32_t bitsRemain = w - (xb * 8);
if (bitsRemain < 8) {
uint32_t bitsRemain = (w > x0) ? (w - x0) : 0;
if (bitsRemain > 0 && bitsRemain < 8) {
mask = (uint8_t)(0xFF << (8 - bitsRemain));
out &= mask;
}