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feat(home): Improve Continue Reading cover with 1-bit Atkinson dithering

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- Add 1-bit BMP generation with Atkinson dithering for better quality thumbnails
- Replace noise dithering with error diffusion for smoother gradients
- Add fillPolygon() to GfxRenderer for proper bookmark ribbon shape
- Change bookmark from rect+triangle carve to pentagon polygon
- Fix bookmark inversion when Continue Reading card is selected
- Show selection state on first render (not just after navigation)
- Fix 1-bit BMP palette lookup in Bitmap::readRow()
- Add drawBitmap1Bit() optimized path for 1-bit BMPs
The 1-bit format eliminates gray passes on home screen for faster rendering
while Atkinson dithering maintains good image quality through error diffusion.
This commit is contained in:
Eunchurn Park
2026-01-05 00:47:42 +09:00
parent 6fbdd06101
commit fbda7aa4f1
9 changed files with 433 additions and 105 deletions
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3
lib/Epub/Epub.cpp
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@@ -369,10 +369,11 @@ bool Epub::generateThumbBmp() const {
return false;
}
// Use smaller target size for Continue Reading card (half of screen: 240x400)
// Generate 1-bit BMP for fast home screen rendering (no gray passes needed)
constexpr int THUMB_TARGET_WIDTH = 240;
constexpr int THUMB_TARGET_HEIGHT = 400;
const bool success =
JpegToBmpConverter::jpegFileToBmpStreamWithSize(coverJpg, thumbBmp, THUMB_TARGET_WIDTH, THUMB_TARGET_HEIGHT);
JpegToBmpConverter::jpegFileTo1BitBmpStreamWithSize(coverJpg, thumbBmp, THUMB_TARGET_WIDTH, THUMB_TARGET_HEIGHT);
coverJpg.close();
thumbBmp.close();
SdMan.remove(coverJpgTempPath.c_str());