marcoand75/cpr-vcodex-steroids 1.3.0.35-dev11-cpr-vcodex-steroids

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🧠Heap optimisation, 🖼️ PNG decoder stability & quality-of-life improvements

This release consolidates memory-saving work from the past development cycle, fixes the screensaver PNG decoder on fragmented heap, improves the status bar layout, and polishes clipping/bookmark rendering with continuous highlights and bionic reading support.

All changes are zero‑BSS‑overhead: no permanent memory reservations, no arena pool, no silent reboot tricks. Every optimisation uses lazy allocation, explicit release, or vector capacity management.

🧠 Heap Optimizations

• Font decompressor lazy init — the 48 KB pool (4 page buffers + 32 KB inflate ring buffer) is no longer allocated at boot. The decompressor only initialises when a compressed font group is actually needed. Saves ~48 KB of heap until first use.
• GfxRenderer freeUnusedRenderMemory() — new method that releases BW grayscale buffer chunks (up to 48 KB), rowBuf_, and polyBuf_. Called before cover generation and screensaver.
• LibraryActivity background memory release — when a reader or screensaver is pushed on top, the library releases its entry vectors (30–60 KB), page title cache, and cover state. Data reloads automatically on next render.
• LibraryCache vector capacity retained — removed shrink_to_fit() calls in sync() and scan(). Keeping capacity reduces reallocation churn and heap fragmentation.
• Lowered heap guards for cover generation — EPUB cover thresholds relaxed from 32/28 KB to 28/24 KB. Cover generation proceeds in tighter memory conditions.
• Full CPU speed during cover generation — HalPowerManager::Lock inserted in the library cover loop, forcing 160 MHz instead of 40 MHz low‑power mode. Cover generation time reduced ~4×.

🖼️ PNG Decoder Stability

• Heap‑safe PNG decoder — the ~58 KB PNG object is allocated once on heap and kept alive for the entire screensaver session. Font caches and decompressor are freed before allocation, giving up to +48 KB contiguous heap.
• No BSS, no arena, no reboot — plain malloc() with careful lifetime management; no permanent overhead, no arena pool, no silent reboot.
• Release on exit — releaseDecoder() frees the decoder when the screensaver exits, returning heap to its pre‑screensaver state.
• Duplicate pushActivity guard — power‑button double‑push storms no longer overwrite the pending activity, preventing a crash race inside the PNG decoder.

✂️ Clipping & Bookmark Highlights

• Continuous clipping blocks — highlight rectangles now span the entire range including spaces, drawn as a single continuous block per line.
• Grayscale pass skip — the background fill is skipped during LSB/MSB antialiasing passes; only the text is re‑drawn, improving visibility on e‑ink grayscale.
• Bionic reading support — clipping highlights now respect the bionic reading setting via TextBlock::renderWord().
• Increased padding — highlight rectangles enlarged (2 px instead of 1 px +2 px height) for better coverage.
• Bookmark colours — grey background + white text for maximum contrast.

📋 Status Bar & Library

• Title overflow fix — the centred chapter/book title in drawStatusBar() is now clamped to never overlap battery/time‑left indicators on the left side.
• Library indexing exclusion — my clippings.txt and my lookups.txt are excluded from book discovery.

🔧 Internals

• TextBlock::renderWord() — new public static method that applies bionic reading logic to a single word, used by clipping/bookmark highlights.
• TextBlock::getWordStyles() — new public accessor for per‑word style data.
• GfxRenderer: freeUnusedRenderMemory() added.
• Activity: freeBackgroundMemory() virtual method added.
• ActivityManager: calls freeBackgroundMemory() before pushing a new activity.