summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/wasm/graphite/shape.cc
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/harfbuzz/src/wasm/graphite/shape.cc')
-rw-r--r--gfx/harfbuzz/src/wasm/graphite/shape.cc250
1 files changed, 250 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/wasm/graphite/shape.cc b/gfx/harfbuzz/src/wasm/graphite/shape.cc
new file mode 100644
index 0000000000..f445049a48
--- /dev/null
+++ b/gfx/harfbuzz/src/wasm/graphite/shape.cc
@@ -0,0 +1,250 @@
+#define HB_WASM_INTERFACE(ret_t, name) __attribute__((export_name(#name))) ret_t name
+
+#include <hb-wasm-api.h>
+
+#include <graphite2/Segment.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+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 = BLOB_INIT;
+ if (!face_copy_table (face, tag, &blob))
+ abort ();
+
+ *len = blob.length;
+ return blob.data;
+}
+
+static void free_table (const void *data, const void *table_data)
+{
+ blob_t blob;
+ blob.length = 0; // Doesn't matter
+ blob.data = (char *) table_data;
+ blob_free (&blob);
+}
+
+void *
+shape_plan_create (face_t *face)
+{
+ const gr_face_ops ops = {sizeof (gr_face_ops), &copy_table, &free_table};
+ gr_face *grface = gr_make_face_with_ops (face, &ops, gr_face_preloadAll);
+ return grface;
+}
+
+void
+shape_plan_destroy (void *data)
+{
+ gr_face_destroy ((gr_face *) data);
+}
+
+bool_t
+shape (void *shape_plan,
+ font_t *font,
+ buffer_t *buffer,
+ const feature_t *features,
+ uint32_t num_features)
+{
+ face_t *face = font_get_face (font);
+ gr_face *grface = (gr_face *) shape_plan;
+
+ direction_t direction = buffer_get_direction (buffer);
+ direction_t horiz_dir = script_get_horizontal_direction (buffer_get_script (buffer));
+ /* TODO vertical:
+ * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
+ * Ogham fonts are supposed to be implemented BTT or not. Need to research that
+ * first. */
+ if ((DIRECTION_IS_HORIZONTAL (direction) &&
+ direction != horiz_dir && horiz_dir != DIRECTION_INVALID) ||
+ (DIRECTION_IS_VERTICAL (direction) &&
+ direction != DIRECTION_TTB))
+ {
+ buffer_reverse_clusters (buffer);
+ direction = DIRECTION_REVERSE (direction);
+ }
+
+ buffer_contents_t contents = BUFFER_CONTENTS_INIT;
+ if (!buffer_copy_contents (buffer, &contents))
+ return false;
+
+ 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));
+ if (!chars)
+ return false;
+ for (unsigned int i = 0; i < contents.length; ++i)
+ chars[i] = contents.info[i].codepoint;
+
+ seg = gr_make_seg (nullptr, grface,
+ 0, // https://github.com/harfbuzz/harfbuzz/issues/3439#issuecomment-1442650148
+ nullptr,
+ gr_utf32, chars, contents.length,
+ 2 | (direction == 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;
+ if (!buffer_contents_realloc (&contents, length))
+ return false;
+ cluster_t *clusters = (cluster_t *) malloc (length * sizeof (cluster_t));
+ uint32_t *gids = (uint32_t *) malloc (length * sizeof (uint32_t));
+ if (!clusters || !gids)
+ {
+ free (clusters);
+ free (gids);
+ return false;
+ }
+
+ memset (clusters, 0, sizeof (clusters[0]) * length);
+ codepoint_t *pg = gids;
+ clusters[0].cluster = contents.info[0].cluster;
+ unsigned int upem = face_get_upem (face);
+ int32_t font_x_scale, font_y_scale;
+ font_get_scale (font, &font_x_scale, &font_y_scale);
+ float xscale = (float) font_x_scale / upem;
+ float yscale = (float) font_y_scale / upem;
+ yscale *= yscale / xscale;
+ unsigned int curradv = 0;
+ if (DIRECTION_IS_BACKWARD (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 (DIRECTION_IS_BACKWARD (direction))
+ {
+ c->advance = curradv - gr_slot_origin_X(is) * xscale;
+ curradv -= c->advance;
+ }
+ else
+ {
+ auto origin_X = gr_slot_origin_X (is) * xscale;
+ c->advance = 0;
+ clusters[ci].advance += origin_X - curradv;
+ curradv = origin_X;
+ }
+ 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 (DIRECTION_IS_BACKWARD (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 = (unsigned) 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 (!DIRECTION_IS_BACKWARD (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 = (int) 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;
+ }
+ buffer_set_contents (buffer, &contents);
+ }
+ 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 = (int) 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 - (int) info->var1 - curradvx + pPos->x_advance;
+ pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
+ }
+ buffer_set_contents (buffer, &contents);
+ buffer_reverse_clusters (buffer);
+ }
+
+ gr_seg_destroy (seg);
+ free (clusters);
+ free (gids);
+
+ bool ret = glyph_count;
+
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-29 13:33:04 +0000