[wasm-graphite] Initial code

src/hb-wasm-api-face.hh

@@ -44,8 +44,8 @@ face_reference_table (HB_WASM_EXEC_ENV_COMPOUND
   unsigned length;
   const char *data = hb_blob_get_data (blob, &length);
 
-  ret.data = wasm_runtime_module_dup_data (module_inst, data, length);
   ret.length = length;
+  ret.data = wasm_runtime_module_dup_data (module_inst, data, length);
 
   hb_blob_destroy (blob);
 }

src/hb-wasm-shape.cc

@@ -159,7 +159,7 @@ _hb_wasm_shape (hb_shape_plan_t    *shape_plan,
 {
   bool ret = true;
   const hb_wasm_face_data_t *face_data = font->face->data.wasm;
-  constexpr uint32_t stack_size = 8092, heap_size = 8092;
+  constexpr uint32_t stack_size = 8092, heap_size = 2 * 1024 * 1024;
 
   wasm_module_inst_t module_inst = nullptr;
   wasm_exec_env_t exec_env = nullptr;

src/wasm-graphite/Makefile

@@ -0,0 +1,22 @@
+all: test.wasm.ttf
+
+%.wasm: %.cc ../hb-wasm-api.h
+	emcc \
+		-I .. \
+		-I ~/graphite/include/ \
+		-fvisibility=hidden \
+		-Wl,--allow-undefined \
+		-Wl,--no-entry \
+		-sERROR_ON_UNDEFINED_SYMBOLS=0 \
+		~/graphite/src/libgraphite2.a \
+		~/wasm/wasi-sdk-19.0/share/wasi-sysroot/lib/wasm32-wasi/libc.a \
+		$< \
+		-o $@
+
+%.wasm.ttf: %.ttf shape.wasm addTable.py
+	python addTable.py $< $@ shape.wasm
+
+clean:
+	$(RM) test.wasm.ttf shape.wasm
+
+.PRECIOUS: shape.wasm

src/wasm-graphite/addTable.py

@@ -0,0 +1,16 @@
+import sys
+from fontTools.ttLib import TTFont
+from fontTools.ttLib.tables.DefaultTable import DefaultTable
+
+if len(sys.argv) == 1:
+    print("usage: python addTable.py input.ttf output.ttf Wasm.bin")
+    sys.exit(1)
+
+font = TTFont(sys.argv[1])
+
+wasm_table = DefaultTable("Wasm")
+wasm_table.data = open(sys.argv[3], "rb").read()
+
+font["Wasm"] = wasm_table
+
+font.save(sys.argv[2])

src/wasm-graphite/shape.cc

@@ -0,0 +1,210 @@
+#define HB_WASM_INTERFACE(ret_t, name) __attribute__((export_name(#name))) ret_t name
+
+#include <hb-wasm-api.h>
+
+#include <graphite2/Segment.h>
+
+extern "C" {
+void *malloc(size_t size);
+void *realloc(void *ptr, size_t size);
+void free(void *ptr);
+void abort();
+void *memset(void *s, int c, size_t n);
+}
+
+void debugprint1 (char *s, int32_t);
+void debugprint2 (char *s, int32_t, int32_t);
+
+static const void *copy_table (const void *data, unsigned int tag, size_t *len)
+{
+  face_t *face = (face_t *) data;
+  blob_t blob = face_reference_table (face, tag);
+
+  *len = blob.length;
+  return blob.data;
+}
+
+static void free_table (const void *data, const void *table_data)
+{
+  free ((void *) table_data);
+}
+
+bool_t
+shape (font_t *font, buffer_t *buffer)
+{
+  face_t *face = font_get_face (font);
+
+  blob_t blob = face_reference_table (face, TAG ('c','m','a','p'));
+
+  blob_free (&blob);
+
+  buffer_contents_t contents = buffer_copy_contents (buffer);
+
+  const gr_face_ops ops = {sizeof (gr_face_ops), &copy_table, nullptr};//&free_table};
+  gr_face *grface = gr_make_face_with_ops (face, &ops, gr_face_preloadAll);
+
+  gr_segment *seg = nullptr;
+  const gr_slot *is;
+  unsigned int ci = 0, ic = 0;
+  unsigned int curradvx = 0, curradvy = 0;
+  unsigned length = contents.length;
+
+  uint32_t *chars = (uint32_t *) malloc (length * sizeof (uint32_t));
+  for (unsigned int i = 0; i < contents.length; ++i)
+    chars[i] = contents.info[i].codepoint;
+
+  /* TODO ensure_native_direction. */
+
+  seg = gr_make_seg (nullptr, grface,
+		     0, // https://github.com/harfbuzz/harfbuzz/issues/3439#issuecomment-1442650148
+		     nullptr,
+		     gr_utf32, chars, contents.length,
+		     2/* | (buffer_get_direction (buffer) == DIRECTION_RTL ? 1 : 0)*/);
+
+  free (chars);
+
+  if (!seg)
+    return false;
+
+  unsigned int glyph_count = gr_seg_n_slots (seg);
+
+  struct cluster_t {
+    unsigned int base_char;
+    unsigned int num_chars;
+    unsigned int base_glyph;
+    unsigned int num_glyphs;
+    unsigned int cluster;
+    int advance;
+  };
+
+  length = glyph_count;
+  //contents.info = (glyph_info_t *) realloc (contents.info, length * sizeof (glyph_info_t));
+  //contents.pos = (glyph_position_t *) realloc (contents.pos, length * sizeof (glyph_position_t));
+  cluster_t *clusters = (cluster_t *) malloc (length * sizeof (cluster_t));
+  uint32_t *gids = (uint32_t *) malloc (length * sizeof (uint32_t));
+
+  memset (clusters, 0, sizeof (clusters[0]) * length);
+  hb_codepoint_t *pg = gids;
+  clusters[0].cluster = contents.info[0].cluster;
+  unsigned int upem = 2048;//hb_face_get_upem (face);
+  float xscale = 10;//(float) font->x_scale / upem;
+  float yscale = 10;//(float) font->y_scale / upem;
+  yscale *= yscale / xscale;
+  unsigned int curradv = 0;
+  if (0)//HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
+  {
+    curradv = gr_slot_origin_X(gr_seg_first_slot(seg)) * xscale;
+    clusters[0].advance = gr_seg_advance_X(seg) * xscale - curradv;
+  }
+  else
+    clusters[0].advance = 0;
+  for (is = gr_seg_first_slot (seg), ic = 0; is; is = gr_slot_next_in_segment (is), ic++)
+  {
+    unsigned int before = gr_slot_before (is);
+    unsigned int after = gr_slot_after (is);
+    *pg = gr_slot_gid (is);
+    pg++;
+    while (clusters[ci].base_char > before && ci)
+    {
+      clusters[ci-1].num_chars += clusters[ci].num_chars;
+      clusters[ci-1].num_glyphs += clusters[ci].num_glyphs;
+      clusters[ci-1].advance += clusters[ci].advance;
+      ci--;
+    }
+
+    if (gr_slot_can_insert_before (is) && clusters[ci].num_chars && before >= clusters[ci].base_char + clusters[ci].num_chars)
+    {
+      cluster_t *c = clusters + ci + 1;
+      c->base_char = clusters[ci].base_char + clusters[ci].num_chars;
+      c->cluster = contents.info[c->base_char].cluster;
+      c->num_chars = before - c->base_char;
+      c->base_glyph = ic;
+      c->num_glyphs = 0;
+      if (0)//HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
+      {
+	c->advance = curradv - gr_slot_origin_X(is) * xscale;
+	curradv -= c->advance;
+      }
+      else
+      {
+	c->advance = 0;
+	clusters[ci].advance += gr_slot_origin_X(is) * xscale - curradv;
+	curradv += clusters[ci].advance;
+      }
+      ci++;
+    }
+    clusters[ci].num_glyphs++;
+
+    if (clusters[ci].base_char + clusters[ci].num_chars < after + 1)
+	clusters[ci].num_chars = after + 1 - clusters[ci].base_char;
+  }
+
+  if (0)//HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
+    clusters[ci].advance += curradv;
+  else
+    clusters[ci].advance += gr_seg_advance_X(seg) * xscale - curradv;
+  ci++;
+
+  for (unsigned int i = 0; i < ci; ++i)
+  {
+    for (unsigned int j = 0; j < clusters[i].num_glyphs; ++j)
+    {
+      glyph_info_t *info = &contents.info[clusters[i].base_glyph + j];
+      info->codepoint = gids[clusters[i].base_glyph + j];
+      info->cluster = clusters[i].cluster;
+      info->var1 = clusters[i].advance;     // all glyphs in the cluster get the same advance
+    }
+  }
+  contents.length = glyph_count;
+
+  /* Positioning. */
+  unsigned int currclus = 0xFFFFFFFF;
+  const glyph_info_t *info = contents.info;
+  glyph_position_t *pPos = contents.pos;
+  if (1)//!HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
+  {
+    curradvx = 0;
+    for (is = gr_seg_first_slot (seg); is; pPos++, ++info, is = gr_slot_next_in_segment (is))
+    {
+      pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx;
+      pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
+      if (info->cluster != currclus) {
+	pPos->x_advance = info->var1;
+	curradvx += pPos->x_advance;
+	currclus = info->cluster;
+      } else
+	pPos->x_advance = 0.;
+
+      pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
+      curradvy += pPos->y_advance;
+    }
+  }
+  else
+  {
+    curradvx = gr_seg_advance_X(seg) * xscale;
+    for (is = gr_seg_first_slot (seg); is; pPos++, info++, is = gr_slot_next_in_segment (is))
+    {
+      if (info->cluster != currclus)
+      {
+	pPos->x_advance = info->var1;
+	curradvx -= pPos->x_advance;
+	currclus = info->cluster;
+      } else
+	pPos->x_advance = 0.;
+
+      pPos->y_advance = gr_slot_advance_Y (is, grface, nullptr) * yscale;
+      curradvy -= pPos->y_advance;
+      pPos->x_offset = gr_slot_origin_X (is) * xscale - info->var1 - curradvx + pPos->x_advance;
+      pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
+    }
+    //hb_buffer_reverse_clusters (buffer);
+  }
+
+  gr_seg_destroy (seg);
+
+  buffer_set_contents (buffer, &contents);
+
+  bool ret = glyph_count;
+
+  return ret;
+}