snark13/Xteink-X4-crosspoint-reader
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Fine-tuned Floyd Steinberg quantization values for better gamma curve.

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This commit is contained in:
Jonas Diemer 2026-01-09 16:12:41 +01:00
parent 7838660ff5
commit 79e9c6dcc8
2 changed files with 9 additions and 9 deletions
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14
lib/GfxRenderer/Bitmap.cpp
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@ -74,18 +74,18 @@ static inline uint8_t quantizeFloydSteinberg(int gray, int x, int width, int16_t
// Quantize to 4 levels (0, 85, 170, 255) // Quantize to 4 levels (0, 85, 170, 255)
uint8_t quantized; uint8_t quantized;
int quantizedValue; int quantizedValue;
if (adjusted < 43) { if (adjusted < 30) {
quantized = 0; quantized = 0;
quantizedValue = 0; quantizedValue = 15;
} else if (adjusted < 128) { } else if (adjusted < 50) {
quantized = 1; quantized = 1;
quantizedValue = 85; quantizedValue = 30;
} else if (adjusted < 213) { } else if (adjusted < 140) {
quantized = 2; quantized = 2;
quantizedValue = 170; quantizedValue = 80;
} else { } else {
quantized = 3; quantized = 3;
quantizedValue = 255; quantizedValue = 210;
} }
// Calculate error // Calculate error

4
src/activities/boot_sleep/SleepActivity.cpp
View File

@ -86,7 +86,7 @@ void SleepActivity::renderCustomSleepScreen() const {
if (SdMan.openFileForRead("SLP", filename, file)) { if (SdMan.openFileForRead("SLP", filename, file)) {
Serial.printf("[%lu] [SLP] Randomly loading: /sleep/%s\n", millis(), files[randomFileIndex].c_str()); Serial.printf("[%lu] [SLP] Randomly loading: /sleep/%s\n", millis(), files[randomFileIndex].c_str());
delay(100); delay(100);
Bitmap bitmap(file, true, 50); Bitmap bitmap(file, true);
if (bitmap.parseHeaders() == BmpReaderError::Ok) { if (bitmap.parseHeaders() == BmpReaderError::Ok) {
renderBitmapSleepScreen(bitmap); renderBitmapSleepScreen(bitmap);
dir.close(); dir.close();
@ -101,7 +101,7 @@ void SleepActivity::renderCustomSleepScreen() const {
// render a custom sleep screen instead of the default. // render a custom sleep screen instead of the default.
FsFile file; FsFile file;
if (SdMan.openFileForRead("SLP", "/sleep.bmp", file)) { if (SdMan.openFileForRead("SLP", "/sleep.bmp", file)) {
Bitmap bitmap(file, true, 50); Bitmap bitmap(file, true, 0);
if (bitmap.parseHeaders() == BmpReaderError::Ok) { if (bitmap.parseHeaders() == BmpReaderError::Ok) {
Serial.printf("[%lu] [SLP] Loading: /sleep.bmp\n", millis()); Serial.printf("[%lu] [SLP] Loading: /sleep.bmp\n", millis());
renderBitmapSleepScreen(bitmap); renderBitmapSleepScreen(bitmap);