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Add heap memory reporting for fonts and sections

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Implements reportMemory() methods across SdCardFont, SdCardFontManager, and Section classes to track resident heap usage. Adds heap audit logging in EpubReaderActivity to attribute memory to fonts, framebuffer, section data, and other components for measurement-driven optimization.
This commit is contained in:
Justin Mitchell
2026-07-14 12:08:29 -04:00
parent 4d19d38152
commit ba92cb902e
7 changed files with 74 additions and 0 deletions
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lib/EpdFont/SdCardFont.cpp
+27
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@@ -1406,6 +1406,33 @@ const EpdGlyph* SdCardFont::onGlyphMiss(void* ctx, uint32_t codepoint) {
return &self->overflow_[slot].glyph;
}
size_t SdCardFont::reportMemory() const {
size_t total = 0;
for (uint8_t si = 0; si < MAX_STYLES; ++si) {
const auto& s = styles_[si];
if (!s.present) continue;
size_t fixed = 0; // loaded once per family: interval/kern/lig tables
if (s.fullIntervals) fixed += s.header.intervalCount * sizeof(EpdUnicodeInterval);
if (s.bmpIntervals) fixed += s.header.intervalCount * sizeof(PerStyle::BmpInterval16);
if (s.kernLeftClasses) fixed += s.header.kernLeftEntryCount * sizeof(EpdKernClassEntry);
if (s.kernRightClasses) fixed += s.header.kernRightEntryCount * sizeof(EpdKernClassEntry);
if (s.ligaturePairs) fixed += s.header.ligaturePairCount * sizeof(EpdLigaturePair);
// kept-if-fits mini arenas: capacity (not count) is what stays resident
size_t mini = s.miniIntervalCapacity * sizeof(EpdUnicodeInterval) + s.miniGlyphCapacity * sizeof(EpdGlyph) +
s.miniBitmapCapacity + s.miniKernLeftCapacity * sizeof(EpdKernClassEntry) +
s.miniKernRightCapacity * sizeof(EpdKernClassEntry) + s.miniKernMatrixCapacity;
const size_t adv = advanceTableSize_[si] * sizeof(AdvanceEntry);
LOG_DBG("SDCF", "mem style%u: fixed=%u mini=%u adv=%u", si, (unsigned)fixed, (unsigned)mini, (unsigned)adv);
total += fixed + mini + adv;
}
size_t overflowBytes = 0;
for (uint32_t i = 0; i < overflowCount_; ++i) {
if (overflow_[i].bitmap) overflowBytes += overflow_[i].glyph.dataLength;
}
total += overflowBytes + overflowCount_ * sizeof(OverflowEntry);
return total;
}
bool SdCardFont::isOverflowGlyph(const EpdGlyph* glyph) const {
for (uint32_t i = 0; i < overflowCount_; i++) {
if (&overflow_[i].glyph == glyph) return true;