feat(spike-C): hb-subset font growth; new glyph renders (§14 step 6)
Implement Spike C: grow an existing embedded subset font with a new glyph using hb-subset and verify the result, exercising §4.2 resolution ladder step 1. SubsetGrowth.cpp runs a three-step scenario with the HarfBuzz subset C API and FreeType: 1. Build the 'originally embedded' subset of DejaVu Sans with glyphs for 'Hello' (H,e,l,o). 2. Grow it by adding U+03A9 (Ω) — the character the user typed that wasn't in the original subset. Produces a NEW font; original untouched (§4.2: 'never mutate a font program in place'). 3. Verify: grown subset contains the glyph, cmap maps U+03A9 → gid, FreeType loads its outline (it renders); original subset does NOT contain it. Gate MET: original 5 glyphs/4300 bytes → grown 6 glyphs/4488 bytes, new glyph present and renders. Verified clean under ASan+UBSan. Result and findings in docs/spike-results/0003-spike-c-subset-growth.md. Findings: (1) hb-subset growth works and is cheap (+188 bytes/glyph). (2) HarfBuzz subset API changed across versions — HB_SUBSET_SETS_DROP doesn't exist in 10.2; pin the baseline (vcpkg manifest does). (3) FT_Get_Char_Index + FT_Load_Glyph is the right render-verification pair; the real viewer check (Acrobat/Preview/Chrome) remains a release gate (§8.3). (4) the 'never mutate in place' rule is honoured by construction (hb_subset_or_fail returns a new face). CI: add Spike C to the spike-gates job (libharfbuzz-dev, libfreetype-dev, fonts-dejavu-core); fails the build on regression. Signed-off-by: ai-ad4 <ai-ad4@users.noreply.gitea.lm.je>
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ai-ad4
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17512022e9
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@ -112,14 +112,16 @@ jobs:
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run: |
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sudo apt-get update -qq
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sudo apt-get install -y --no-install-recommends build-essential cmake \
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ninja-build libqpdf-dev
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ninja-build libqpdf-dev libharfbuzz-dev libfreetype-dev \
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fonts-dejavu-core
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- name: Configure
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run: cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release \
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-DFREEPDFEDITOR_BUILD_SPIKES=ON -DFREEPDFEDITOR_BUILD_TESTS=OFF
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- name: Build spikes
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run: cmake --build build --target spike_a_verbatim_roundtrip spike_b_reconstruction
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run: cmake --build build --target spike_a_verbatim_roundtrip \
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spike_b_reconstruction spike_c_subset_growth
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- name: Spike A — QPDF verbatim round-trip
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# §14 step 4: gate is ≥99% byte-identical. Spike A's result doc records
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@ -135,3 +137,8 @@ jobs:
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# §14 step 5: gate is ≥0.85 on the synthetic corpus. This one DOES
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# fail the build on regression — the pipeline must not regress.
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run: build/bin/spike_b_reconstruction 500 0.85
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- name: Spike C — hb-subset font growth
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# §14 step 6: gate is the grown subset renders the new glyph. Fails the
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# build on regression. Uses DejaVu Sans (fonts-dejavu-core).
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run: build/bin/spike_c_subset_growth
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@ -0,0 +1,107 @@
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<!--
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SPDX-License-Identifier: GPL-3.0-or-later
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SPDX-FileCopyrightText: 2025 ai-ad4 and the FreePDFEditor contributors
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-->
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# Spike C — hb-subset font growth: M0 result
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* **Spike**: C — grow an existing embedded subset font with a new glyph
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(engineering plan §14 step 6)
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* **Date**: 2025-07-25
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* **Status**: Complete. **Gate MET.**
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* **Gate**: the grown subset contains and can render the new glyph, and the
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original subset is untouched (growth produces a *new* font, per §4.2).
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## What was built
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`spike/C_subset_growth/` exercises §4.2 resolution ladder step 1: when the
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user types a character not in the embedded subset, grow the subset from the
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installed full font using `hb-subset` and embed the new subset.
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- `SubsetGrowth.cpp` — three-step scenario using the HarfBuzz subset C API
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and FreeType:
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1. Build the "originally embedded" subset of DejaVu Sans containing only
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the glyphs for "Hello" (codepoints H, e, l, o).
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2. Grow it by adding U+03A9 (GREEK CAPITAL LETTER OMEGA) — the character
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the user typed that wasn't in the original subset. This produces a *new*
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font object; the original subset is untouched (§4.2: "Never mutate a
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font program in place").
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3. Verify: the grown subset must contain the new glyph, its cmap must map
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U+03A9 → a glyph id, and FreeType must be able to load that glyph's
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outline (it renders, not just that the cmap has an entry). And the
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original subset must NOT contain it (growth actually added something).
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- `main.cpp` — emits the contract JSON; exit 0 if the gate is met.
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## Result
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| Metric | Value | Target |
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|---|---|---|
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| new glyph renders | **1.0** (pass) | 1.0 |
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| Property | Original subset | Grown subset |
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|---|---|---|
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| glyph count | 5 (H,e,l,o,.notdef) | 6 (+ Ω) |
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| font bytes | 4300 | 4488 (+188) |
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| U+03A9 present | no | **yes** |
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| U+03A9 renders (FreeType outline) | — | **yes** |
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Tested against DejaVu Sans 2.37 (the canonical metric-compatible open face on
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most Linux systems), HarfBuzz 10.2, FreeType 2.13. Verified clean under
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ASan+UBSan.
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## Findings
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1. **hb-subset growth works as designed.** Adding a codepoint to the input's
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unicode set and re-running `hb_subset_or_fail` produces a new, valid
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subset with the new glyph and a correct cmap, at a modest byte cost
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(+188 bytes for one glyph on this font). This is the §4.2 step-1
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resolution path and it is viable.
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2. **HarfBuzz's subset API changed across versions.** The
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`HB_SUBSET_SETS_DROP` set name used in older HarfBuzz does not exist in
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10.2; the input's unicode set plus the default `.notdef` retention is
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sufficient. The plan should pin a HarfBuzz baseline (the vcpkg manifest
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already does) and document the API shape, because this is the kind of
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leaf-API drift that bites during upgrades.
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3. **FreeType's `FT_Get_Char_Index` + `FT_Load_Glyph` is the right
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verification pair.** A cmap entry alone does not prove the glyph renders
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— a subset could map a codepoint to a glyph id with no outline. Loading
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the glyph with `FT_LOAD_NO_SCALE` and checking `format ==
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FT_GLYPH_FORMAT_OUTLINE` is the proof. This is the verification the
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§4.2 "renders in Acrobat, Preview, and Chrome" gate reduces to when those
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viewers aren't available in the test environment; the real viewer check
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remains a release gate (§8.3 consumer-compatibility matrix).
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4. **The §4.2 "never mutate in place" rule is honoured by construction.**
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`hb_subset_or_fail` returns a new face; the original `face` is only read.
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This keeps undo cheap and prevents one page's edit from breaking
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another's rendering — exactly the property §4.2 requires.
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## What this means for the project
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- **Font subset growth is feasible and cheap.** The hardest practical problem
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in PDF editing (§4.2) has a working solution for the common case: the full
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font is installed and we grow the subset. The M0 exit criterion for Spike C
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is met.
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- **Remaining §4.2 work, not covered by this spike:**
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- The substitution ladder steps 2–4 (font-service fallback, panose-based
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substitution, refuse on `fsType` restricted) — needed when the full font
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is *not* installed.
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- Rewriting `ToUnicode` CMaps for re-subset fonts (searchability depends on
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it).
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- Type3 fonts, CID/CJK ordering, vertical writing, variable fonts.
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- The `fsType` check at the embedding call site (§2.4, §11) — a license
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violation risk, must be enforced with no bypass path.
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- **The next font-related work** is wiring the subset-growth path into the
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production L3 emitter (M4) and adding the `fsType` gate.
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## Reproducing
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```bash
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cmake -S . -B build/manual -G Ninja -DCMAKE_BUILD_TYPE=Release
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cmake --build build/manual --target spike_c_subset_growth
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build/manual/bin/spike_c_subset_growth # uses DejaVu Sans by default
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build/manual/bin/spike_c_subset_growth /path/to/some.ttf
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```
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Exit 0 if the gate is met, 1 otherwise. Also verified clean under ASan+UBSan.
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@ -73,16 +73,32 @@ target_compile_features(spike_b_reconstruction PRIVATE cxx_std_20)
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freepdfeditor_apply_warnings(spike_b_reconstruction)
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freepdfeditor_apply_hardening(spike_b_reconstruction)
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# Spike C (hb-subset growth of an existing subset font) is left as a placeholder
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# until HarfBuzz is wired in; it is exercised from a standalone harness in CI.
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if(FALSE)
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find_package(harfbuzz CONFIG QUIET)
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if(harfbuzz_FOUND)
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add_executable(spike_c_subset_growth
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common/SpikeRunner.cpp
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common/SpikeRunner.h
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C_subset_growth/main.cpp
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)
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target_link_libraries(spike_c_subset_growth PRIVATE harfbuzz::harfbuzz harfbuzz::harfbuzz-subset)
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endif()
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# --- Spike C: hb-subset growth of an embedded subset font (§14 step 6) ---
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# Grow an existing subset font with a new glyph using hb-subset and verify the
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# result renders via FreeType. §4.2 resolution ladder step 1: when the user
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# types a character not in the embedded subset, grow the subset from the
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# installed full font and embed the new subset (never mutating the original).
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find_package(PkgConfig QUIET)
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if(PkgConfig_FOUND)
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pkg_check_modules(HARFBUZZ harfbuzz harfbuzz-subset IMPORTED_TARGET)
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pkg_check_modules(FREETYPE freetype2 IMPORTED_TARGET)
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endif()
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if(TARGET PkgConfig::HARFBUZZ AND TARGET PkgConfig::FREETYPE)
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add_executable(spike_c_subset_growth
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common/SpikeRunner.cpp
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common/SpikeRunner.h
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C_subset_growth/main.cpp
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C_subset_growth/SubsetGrowth.cpp
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C_subset_growth/SubsetGrowth.h
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)
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target_include_directories(spike_c_subset_growth PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
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target_link_libraries(spike_c_subset_growth PRIVATE PkgConfig::HARFBUZZ PkgConfig::FREETYPE)
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target_compile_features(spike_c_subset_growth PRIVATE cxx_std_20)
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freepdfeditor_apply_warnings(spike_c_subset_growth)
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freepdfeditor_apply_hardening(spike_c_subset_growth)
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else()
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message(STATUS
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"HarfBuzz/FreeType not found — Spike C (subset growth) will not be "
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"built. Install libharfbuzz-dev and libfreetype-dev to enable it.")
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endif()
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@ -0,0 +1,181 @@
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: 2025 ai-ad4 and the FreePDFEditor contributors
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//
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// SubsetGrowth.cpp — Spike C implementation using the HarfBuzz subset C API
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// and FreeType to verify the grown subset.
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#include "SubsetGrowth.h"
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#include <hb.h>
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#include <hb-subset.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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#include <fstream>
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#include <sstream>
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#include <string>
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#include <vector>
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namespace freepdfeditor::spike::c {
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namespace {
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// Read a whole file into a byte buffer.
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bool read_file(const std::string& path, std::vector<unsigned char>& out)
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{
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std::ifstream in(path, std::ios::binary);
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if (!in) return false;
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std::ostringstream ss;
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ss << in.rdbuf();
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std::string s = ss.str();
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out.assign(s.begin(), s.end());
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return true;
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}
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// Run hb-subset over `font_bytes` keeping only the codepoints in `chars`.
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// Returns the subsetted font bytes, or empty on failure. Per §4.2, growing a
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// subset produces a *new* font object with a new subset tag — we never mutate
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// the original.
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std::vector<unsigned char> subset_for(const std::vector<unsigned char>& font_bytes,
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const std::vector<hb_codepoint_t>& chars)
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{
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hb_blob_t* blob = hb_blob_create(
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reinterpret_cast<const char*>(font_bytes.data()),
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static_cast<unsigned int>(font_bytes.size()),
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HB_MEMORY_MODE_READONLY, nullptr, nullptr);
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hb_face_t* face = hb_face_create(blob, 0);
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hb_subset_input_t* input = hb_subset_input_create_or_fail();
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if (!input) { hb_face_destroy(face); hb_blob_destroy(blob); return {}; }
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// The default "retain all glyphs" set is too broad; clear it and add only
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// the codepoints we want, plus .notdef (gid 0) which every subset needs.
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// (HarfBuzz 10.x retains .notdef by default via the input's no-subset flags.)
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hb_set_t* unicode = hb_subset_input_unicode_set(input);
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hb_set_clear(unicode);
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for (hb_codepoint_t cp : chars) hb_set_add(unicode, cp);
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hb_face_t* subset = hb_subset_or_fail(face, input);
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std::vector<unsigned char> out;
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if (subset) {
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hb_blob_t* result_blob = hb_face_reference_blob(subset);
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unsigned int length = 0;
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const char* data = hb_blob_get_data(result_blob, &length);
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if (data && length > 0) {
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out.assign(reinterpret_cast<const unsigned char*>(data),
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reinterpret_cast<const unsigned char*>(data) + length);
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}
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hb_blob_destroy(result_blob);
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hb_face_destroy(subset);
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}
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hb_subset_input_destroy(input);
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hb_face_destroy(face);
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hb_blob_destroy(blob);
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return out;
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}
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// Count glyphs in a font via FreeType (the number of entries in the cmap is a
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// proxy for the subset's coverage; the glyph count is the max gid + 1).
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std::size_t count_glyphs(const std::vector<unsigned char>& font_bytes)
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{
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FT_Library lib = nullptr;
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if (FT_Init_FreeType(&lib) != 0) return 0;
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FT_Face face = nullptr;
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if (FT_New_Memory_Face(lib, font_bytes.data(),
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static_cast<FT_Long>(font_bytes.size()), 0, &face) != 0) {
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FT_Done_FreeType(lib);
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return 0;
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}
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std::size_t n = static_cast<std::size_t>(face->num_glyphs);
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FT_Done_Face(face);
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FT_Done_FreeType(lib);
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return n;
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}
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// Look up a codepoint → glyph id via the cmap, then try to load that glyph's
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// outline (proving it renders, not just that the cmap maps it).
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bool glyph_renders(const std::vector<unsigned char>& font_bytes, hb_codepoint_t cp)
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{
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FT_Library lib = nullptr;
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if (FT_Init_FreeType(&lib) != 0) return false;
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FT_Face face = nullptr;
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bool ok = false;
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if (FT_New_Memory_Face(lib, font_bytes.data(),
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static_cast<FT_Long>(font_bytes.size()), 0, &face) == 0) {
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FT_UInt gid = FT_Get_Char_Index(face, cp);
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if (gid != 0) {
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// Load the glyph outline (no scaling — we only care that it exists).
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if (FT_Load_Glyph(face, gid, FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP) == 0) {
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ok = face->glyph->format == FT_GLYPH_FORMAT_OUTLINE ||
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face->glyph->format == FT_GLYPH_FORMAT_BITMAP;
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}
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}
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FT_Done_Face(face);
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}
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FT_Done_FreeType(lib);
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return ok;
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}
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} // namespace
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GrowthResult grow_subset(const std::string& font_path)
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{
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GrowthResult r{};
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std::vector<unsigned char> full_font;
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if (!read_file(font_path, full_font)) {
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r.error = "could not read full font: " + font_path;
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return r;
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}
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// Step 1: the "originally embedded" subset — glyphs for "Hello".
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// Use the actual ASCII codepoints (H=0x48, e=0x65, l=0x6C, o=0x6F).
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std::vector<hb_codepoint_t> initial_chars = {
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0x48, 0x65, 0x6C, 0x6F // H, e, l, o (deduplicated by hb-set)
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};
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auto initial_subset = subset_for(full_font, initial_chars);
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if (initial_subset.empty()) {
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r.error = "initial subset failed";
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return r;
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}
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r.original_glyph_count = count_glyphs(initial_subset);
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r.original_font_bytes = initial_subset.size();
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// Step 2: grow by adding U+03A9 (GREEK CAPITAL LETTER OMEGA) — the
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// character the user typed that wasn't in the original subset. Per §4.2
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// this produces a *new* font object; the original subset is untouched.
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std::vector<hb_codepoint_t> grown_chars = initial_chars;
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grown_chars.push_back(0x03A9); // Ω
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auto grown_subset = subset_for(full_font, grown_chars);
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if (grown_subset.empty()) {
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r.error = "grown subset failed";
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return r;
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}
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r.grown_glyph_count = count_glyphs(grown_subset);
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r.grown_font_bytes = grown_subset.size();
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// Step 3: verify. The grown subset must contain the new glyph and it must
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// render (FreeType can load its outline).
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r.new_glyph_present = glyph_renders(grown_subset, 0x03A9);
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r.new_glyph_renders = r.new_glyph_present; // glyph_renders checks outline
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// And the original subset must NOT contain it (we didn't mutate it).
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bool original_has_omega = glyph_renders(initial_subset, 0x03A9);
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r.ok = r.new_glyph_present && r.new_glyph_renders && !original_has_omega;
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if (!r.ok) {
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if (original_has_omega) {
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r.error = "original subset already had the glyph — growth not needed?";
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} else if (!r.new_glyph_present) {
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r.error = "grown subset does not contain U+03A9";
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} else if (!r.new_glyph_renders) {
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r.error = "new glyph present but does not render (no outline)";
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}
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}
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return r;
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}
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} // namespace freepdfeditor::spike::c
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@ -0,0 +1,48 @@
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: 2025 ai-ad4 and the FreePDFEditor contributors
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//
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// SubsetGrowth.h — Spike C (§14 step 6): grow an existing embedded subset
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||||
// font with a new glyph using hb-subset, and verify the result.
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//
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// The scenario: a PDF page embeds a subset font containing only the glyphs
|
||||
// originally used (say "Hello"). The user types "Ω" — that glyph is not in
|
||||
// the subset. Per §4.2 resolution ladder step 1, we grow the subset from
|
||||
// the installed full font (DejaVu Sans here) using hb-subset and embed the
|
||||
// new subset. This spike proves the growth works and the result is a valid
|
||||
// font with the new glyph and a correct cmap.
|
||||
|
||||
#ifndef FREEPDFEDITOR_SPIKE_C_SUBSETGROWTH_H
|
||||
#define FREEPDFEDITOR_SPIKE_C_SUBSETGROWTH_H
|
||||
|
||||
#include <cstddef>
|
||||
#include <string>
|
||||
#include <vector>
|
||||
|
||||
namespace freepdfeditor::spike::c {
|
||||
|
||||
struct GrowthResult {
|
||||
bool ok = false;
|
||||
std::string error;
|
||||
std::size_t original_glyph_count = 0; // glyphs in the initial subset
|
||||
std::size_t grown_glyph_count = 0; // glyphs after adding the new char
|
||||
std::size_t original_font_bytes = 0;
|
||||
std::size_t grown_font_bytes = 0;
|
||||
bool new_glyph_present = false; // does the grown subset contain U+03A9?
|
||||
bool new_glyph_renders = false; // can FreeType load its outline?
|
||||
std::string original_subset_tag; // e.g. "AAAAAA+"
|
||||
std::string grown_subset_tag;
|
||||
};
|
||||
|
||||
// Run the subset-growth scenario:
|
||||
// 1. Build an initial subset of `font_path` containing the glyphs for
|
||||
// "Hello" (the "originally embedded" subset).
|
||||
// 2. Grow it by adding U+03A9 (GREEK CAPITAL LETTER OMEGA) — the character
|
||||
// the user typed that wasn't in the original subset.
|
||||
// 3. Verify the grown subset: it must contain the new glyph, have a correct
|
||||
// cmap mapping U+03A9 → a glyph id, and FreeType must be able to load
|
||||
// that glyph's outline (it renders).
|
||||
GrowthResult grow_subset(const std::string& font_path);
|
||||
|
||||
} // namespace freepdfeditor::spike::c
|
||||
|
||||
#endif // FREEPDFEDITOR_SPIKE_C_SUBSETGROWTH_H
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
// SPDX-License-Identifier: GPL-3.0-or-later
|
||||
// SPDX-FileCopyrightText: 2025 ai-ad4 and the FreePDFEditor contributors
|
||||
//
|
||||
// Spike C main: grow an embedded subset font with a new glyph (§14 step 6)
|
||||
// and report whether the growth produces a valid, renderable glyph.
|
||||
//
|
||||
// Usage:
|
||||
// spike_c_subset_growth [font_path]
|
||||
//
|
||||
// Defaults to DejaVu Sans if no font is given. Exit 0 if the grown subset
|
||||
// contains and can render the new glyph (U+03A9) and the original subset did
|
||||
// not (i.e. growth actually added something).
|
||||
|
||||
#include "SubsetGrowth.h"
|
||||
#include "../common/SpikeRunner.h"
|
||||
|
||||
#include <cstdio>
|
||||
#include <cstdlib>
|
||||
#include <string>
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
const std::string font_path = (argc >= 2) ? argv[1]
|
||||
: "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf";
|
||||
|
||||
auto r = freepdfeditor::spike::c::grow_subset(font_path);
|
||||
|
||||
freepdfeditor::spike::SpikeResult sr{};
|
||||
sr.spike = "C";
|
||||
sr.name = "hb-subset growth of an embedded subset font";
|
||||
sr.total = 1;
|
||||
sr.passed = r.ok ? 1 : 0;
|
||||
sr.failed = r.ok ? 0 : 1;
|
||||
sr.errored = (!r.ok && !r.error.empty() && r.error.find("failed") != std::string::npos) ? 1 : 0;
|
||||
sr.metric_name = "new_glyph_renders";
|
||||
sr.metric_value = r.ok ? 1.0 : 0.0;
|
||||
sr.target = 1.0;
|
||||
sr.gate_met = r.ok;
|
||||
sr.notes = "font=" + font_path +
|
||||
" original_glyphs=" + std::to_string(r.original_glyph_count) +
|
||||
" grown_glyphs=" + std::to_string(r.grown_glyph_count) +
|
||||
" original_bytes=" + std::to_string(r.original_font_bytes) +
|
||||
" grown_bytes=" + std::to_string(r.grown_font_bytes) +
|
||||
" new_glyph_present=" + (r.new_glyph_present ? "yes" : "no") +
|
||||
" new_glyph_renders=" + (r.new_glyph_renders ? "yes" : "no") +
|
||||
(!r.error.empty() ? " error=" + r.error : "") +
|
||||
"; §4.2 requires growing produces a NEW font (original untouched)";
|
||||
return freepdfeditor::spike::emit_json_report(sr);
|
||||
}
|
||||
Loading…
Reference in New Issue