Files

mod: Phase 1 - bring forward mod-exclusive files with ActivityManager migration

Brings ~55 mod-exclusive files to the upstream-based mod/master-resync branch:

Activities (migrated to new ActivityManager pattern):
- Clock/Time: SetTimeActivity, SetTimezoneOffsetActivity, NtpSyncActivity
- Dictionary: DictionaryDefinitionActivity, DictionarySuggestionsActivity,
  DictionaryWordSelectActivity, LookedUpWordsActivity
- Bookmark: EpubReaderBookmarkSelectionActivity
- Book management: BookManageMenuActivity, EndOfBookMenuActivity
- OPDS: OpdsServerListActivity, OpdsSettingsActivity
- Utility: DirectoryPickerActivity, NumericStepperActivity

Utilities (unchanged):
- BookManager, BookSettings, BookmarkStore, BootNtpSync
- Dictionary, LookupHistory, TimeSync, OpdsServerStore

Libraries: PlaceholderCover, TableData, ChapterXPathIndexer
Scripts: inject_mod_version, generate_book_icon, preview_placeholder_cover
Docs: KOReader sync XPath mapping

Migration changes:
- ActivityWithSubactivity -> Activity base class
- Callback constructors -> finish()/setResult() pattern
- enterNewActivity() -> startActivityForResult()
- Activity::RenderLock&& -> RenderLock&&

These files won't compile yet - they reference mod settings and I18n
strings that will be added in subsequent phases.

Made-with: Cursor

2026-03-07 15:10:00 -05:00

2.7 KiB

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Letterbox Fill Redesign

Date: 2026-02-13 Task: Strip out the 5-mode letterbox edge fill system and replace with a simplified 3-mode design

Changes Made

Problem

The existing letterbox fill feature had 5 modes (None, Solid, Blended, Gradient, Matched) with ~300 lines of complex code including per-pixel edge arrays, malloc'd buffers, binary edge caching, framebuffer-level column/row copying, and a gradient direction sub-setting. Several modes introduced visual corruption that couldn't be resolved.

New Design

Simplified to 3 modes:

None -- no fill
Solid -- computes dominant edge color, snaps to nearest of 4 e-ink levels (black/dark gray/light gray/white), fills uniformly
Blended -- computes dominant edge color, fills with exact gray value using noise dithering for smooth approximation

Files Changed

src/CrossPointSettings.h -- Removed LETTERBOX_GRADIENT, LETTERBOX_MATCHED enum values; removed SLEEP_SCREEN_GRADIENT_DIR enum and sleepScreenGradientDir member; changed default to LETTERBOX_NONE
src/SettingsList.h -- Trimmed Letterbox Fill options to {None, Solid, Blended}; removed Gradient Direction setting entry
src/CrossPointSettings.cpp -- Removed sleepScreenGradientDir from write path; added dummy read for backward compatibility with old settings files; decremented SETTINGS_COUNT from 32 to 31
src/activities/boot_sleep/SleepActivity.cpp -- Major rewrite:
- Removed: LetterboxGradientData struct, loadEdgeCache()/saveEdgeCache(), sampleBitmapEdges(), copyEdgeRowsToLetterbox(), old drawLetterboxFill()
- Added: LetterboxFillData struct (2 bytes vs arrays), snapToEinkLevel(), computeEdgeAverages() (running sums only, no malloc), simplified drawLetterboxFill()
- Cleaned renderBitmapSleepScreen(): removed matched/gradient logic, edge cache paths, unused scaledWidth/scaledHeight
- Cleaned renderCoverSleepScreen(): removed edge cache path derivation
- Removed unused includes (<Serialization.h>, <cstring>), added <cmath>
src/activities/boot_sleep/SleepActivity.h -- Removed edgeCachePath parameter from renderBitmapSleepScreen() signature; removed unused <string> include

Backward Compatibility

Enum values 0/1/2 (None/Solid/Blended) unchanged -- existing settings preserved
Old Gradient (3) or Matched (4) values rejected by readAndValidate, falling back to default (None)
Old sleepScreenGradientDir byte consumed via dummy read during settings load
Orphaned _edges.bin cache files on SD cards are harmless

Follow-up Items

Test all 3 fill modes on device with various cover aspect ratios
Consider cleaning up orphaned _edges.bin files (optional, low priority)

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