diff options
Diffstat (limited to 'utils')
| -rw-r--r-- | utils/viewer-pangocairo.c | 118 |
1 files changed, 117 insertions, 1 deletions
diff --git a/utils/viewer-pangocairo.c b/utils/viewer-pangocairo.c index 8fe9db59..2cfe2cee 100644 --- a/utils/viewer-pangocairo.c +++ b/utils/viewer-pangocairo.c @@ -26,6 +26,9 @@ #include <pango/pangocairo.h> +#include <hb-ot.h> +#include <hb-glib.h> + static int opt_annotate = 0; typedef struct @@ -158,7 +161,8 @@ enum { ANNOTATE_GLYPH_EXTENTS = 256, ANNOTATE_CARET_POSITIONS = 512, ANNOTATE_CARET_SLOPE = 1024, - ANNOTATE_LAST = 2048, + ANNOTATE_RUN_BASELINES = 2048, + ANNOTATE_LAST = 4096, }; static struct { @@ -169,6 +173,7 @@ static struct { { ANNOTATE_GRAVITY_ROOF, "gravity-roof", "gravity" }, { ANNOTATE_BLOCK_PROGRESSION, "block-progression", "progression" }, { ANNOTATE_BASELINES, "baselines", "baselines" }, + { ANNOTATE_RUN_BASELINES, "run-baselines", "run-baselines" }, { ANNOTATE_LAYOUT_EXTENTS, "layout-extents", "layout" }, { ANNOTATE_LINE_EXTENTS, "line-extents", "line" }, { ANNOTATE_RUN_EXTENTS, "run-extents", "run" }, @@ -308,6 +313,117 @@ render_callback (PangoLayout *layout, cairo_restore (cr); } +#if HB_VERSION_ATLEAST(4,0,0) + if (annotate & ANNOTATE_RUN_BASELINES) + { + hb_ot_layout_baseline_tag_t baseline_tag = 0; + /* draw baselines for runs in blue */ + cairo_save (cr); + cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, 0.5); + + iter = pango_layout_get_iter (layout); + do + { + PangoLayoutRun *run; + PangoRectangle rect; + hb_font_t *hb_font; + hb_ot_layout_baseline_tag_t baselines[] = { + HB_OT_LAYOUT_BASELINE_TAG_ROMAN, + HB_OT_LAYOUT_BASELINE_TAG_HANGING, + HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT, + HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT, + HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT, + HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL, + HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, + HB_OT_LAYOUT_BASELINE_TAG_MATH + }; + hb_direction_t dir; + hb_tag_t script, lang; + hb_position_t coord; + + run = pango_layout_iter_get_run (iter); + if (!run) + { + baseline_tag = 0; + continue; + } + + if (baseline_tag == 0) + { + hb_script_t script = hb_glib_script_to_script (run->item->analysis.script); + + if (run->item->analysis.flags & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE) + baseline_tag = HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL; + else + baseline_tag = hb_ot_layout_get_horizontal_baseline_tag_for_script (script); + } + + y = pango_layout_iter_get_run_baseline (iter); + pango_layout_iter_get_run_extents (iter, NULL, &rect); + + hb_font = pango_font_get_hb_font (run->item->analysis.font); + if (run->item->analysis.flags & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE) + dir = HB_DIRECTION_TTB; + else + dir = HB_DIRECTION_LTR; + script = hb_glib_script_to_script (run->item->analysis.script); + lang = HB_TAG_NONE; + + for (int i = 0; i < G_N_ELEMENTS (baselines); i++) + { + char buf[5] = { 0, }; + + cairo_save (cr); + + if (baselines[i] == baseline_tag) + cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.5); + else + cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, 0.5); + + if (hb_ot_layout_get_baseline (hb_font, + baselines[i], + dir, + script, + lang, + &coord)) + cairo_set_dash (cr, NULL, 0, 0); + else + { + double dashes[] = { 4 * lw, 4 * lw }; + + hb_ot_layout_get_baseline_with_fallback (hb_font, + baselines[i], + dir, + script, + lang, + &coord); + + cairo_set_dash (cr, dashes, 2, 0); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE); + } + cairo_move_to (cr, + (double)rect.x / PANGO_SCALE, + (double)(y - coord) / PANGO_SCALE); + cairo_rel_line_to (cr, (double)rect.width / PANGO_SCALE, 0); + cairo_stroke (cr); + cairo_set_source_rgb (cr, 0, 0, 0); + cairo_move_to (cr, + (double)rect.x / PANGO_SCALE - 5, + (double)(y - coord) / PANGO_SCALE - 5); + hb_tag_to_string (baselines[i], buf); + if (baselines[i] == baseline_tag) + g_print ("dominant %s\n", buf); + cairo_show_text (cr, buf); + + cairo_restore (cr); + } + } + while (pango_layout_iter_next_run (iter)); + pango_layout_iter_free (iter); + cairo_restore (cr); + } +#endif + if (annotate & ANNOTATE_LAYOUT_EXTENTS) { /* draw the logical rect in red */ |