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author | Behdad Esfahbod <behdad@behdad.org> | 2014-07-27 18:11:16 -0400 |
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committer | Behdad Esfahbod <behdad@behdad.org> | 2015-04-04 16:13:07 -0700 |
commit | 14c11dd96e1547aaede1bb05a0243f5b0b53186e (patch) | |
tree | d9af93737a52e46e8f9b27eefc86918aed30e4a6 /pango/pangofc-shape.c | |
parent | cfe9ce995d7e12a3e3f64c923123337d5dba25b0 (diff) | |
download | pango-14c11dd96e1547aaede1bb05a0243f5b0b53186e.tar.gz |
Move shapers from modules/basic/ into pango/
Note wired up yet. Doesn't build.
Diffstat (limited to 'pango/pangofc-shape.c')
-rw-r--r-- | pango/pangofc-shape.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/pango/pangofc-shape.c b/pango/pangofc-shape.c new file mode 100644 index 00000000..d77dacef --- /dev/null +++ b/pango/pangofc-shape.c @@ -0,0 +1,483 @@ +/* Pango + * basic-fc.c: Basic shaper for FreeType-based backends + * + * Copyright (C) 2000, 2007, 2009 Red Hat Software + * Authors: + * Owen Taylor <otaylor@redhat.com> + * Behdad Esfahbod <behdad@behdad.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include "config.h" +#include <string.h> + +#define PANGO_ENABLE_BACKEND 1 /* XXX */ + +#include "pango-engine.h" +#include "pango-utils.h" +#include "pangofc-fontmap.h" +#include "pangofc-font.h" +#include <hb-ft.h> +#include <hb-glib.h> + +#define PANGO_UNITS_26_6(d) ((d) << 4) + + +/* No extra fields needed */ +typedef PangoEngineShape BasicEngineFc; +typedef PangoEngineShapeClass BasicEngineFcClass; + +#define SCRIPT_ENGINE_NAME "BasicScriptEngineFc" +#define RENDER_TYPE PANGO_RENDER_TYPE_FC + +static PangoEngineScriptInfo basic_scripts[] = { + { PANGO_SCRIPT_COMMON, "" } +}; + +static PangoEngineInfo script_engines[] = { + { + SCRIPT_ENGINE_NAME, + PANGO_ENGINE_TYPE_SHAPE, + RENDER_TYPE, + basic_scripts, G_N_ELEMENTS(basic_scripts) + } +}; + + +/* cache a single hb_buffer_t */ +static hb_buffer_t *cached_buffer = NULL; /* MT-safe */ +G_LOCK_DEFINE_STATIC (cached_buffer); + +static hb_buffer_t * +create_buffer (void) +{ + hb_buffer_t *buffer; + + buffer = hb_buffer_create (); + hb_buffer_set_unicode_funcs (buffer, hb_glib_get_unicode_funcs ()); + + return buffer; +} + +static hb_buffer_t * +acquire_buffer (gboolean *free_buffer) +{ + hb_buffer_t *buffer; + + if (G_LIKELY (G_TRYLOCK (cached_buffer))) + { + if (G_UNLIKELY (!cached_buffer)) + cached_buffer = create_buffer (); + + buffer = cached_buffer; + *free_buffer = FALSE; + } + else + { + buffer = create_buffer (); + *free_buffer = TRUE; + } + + return buffer; +} + +static void +release_buffer (hb_buffer_t *buffer, gboolean free_buffer) +{ + if (G_LIKELY (!free_buffer)) + { + hb_buffer_reset (buffer); + G_UNLOCK (cached_buffer); + } + else + hb_buffer_destroy (buffer); +} + +typedef struct _PangoFcHbContext { + FT_Face ft_face; + PangoFcFont *fc_font; + gboolean vertical; + int improper_sign; +} PangoFcHbContext; + +static hb_bool_t +pango_fc_hb_font_get_glyph (hb_font_t *font, void *font_data, + hb_codepoint_t unicode, hb_codepoint_t variation_selector, + hb_codepoint_t *glyph, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + PangoFcFont *fc_font = context->fc_font; + + *glyph = pango_fc_font_get_glyph (fc_font, unicode); + if (G_LIKELY (*glyph)) + return TRUE; + + *glyph = PANGO_GET_UNKNOWN_GLYPH (unicode); + + /* We draw our own invalid-Unicode shape, so prevent HarfBuzz + * from using REPLACEMENT CHARACTER. */ + if (unicode > 0x10FFFF) + return TRUE; + + return FALSE; +} + +static hb_bool_t +pango_fc_hb_font_get_glyph_contour_point (hb_font_t *font, void *font_data, + hb_codepoint_t glyph, unsigned int point_index, + hb_position_t *x, hb_position_t *y, + void *user_data G_GNUC_UNUSED) +{ + return FALSE; +#if 0 + FT_Face ft_face = (FT_Face) font_data; + int load_flags = FT_LOAD_DEFAULT; + + /* TODO: load_flags, embolden, etc */ + + if (HB_UNLIKELY (FT_Load_Glyph (ft_face, glyph, load_flags))) + return FALSE; + + if (HB_UNLIKELY (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)) + return FALSE; + + if (HB_UNLIKELY (point_index >= (unsigned int) ft_face->glyph->outline.n_points)) + return FALSE; + + *x = ft_face->glyph->outline.points[point_index].x; + *y = ft_face->glyph->outline.points[point_index].y; + + return TRUE; +#endif +} + +static hb_position_t +pango_fc_hb_font_get_glyph_advance (hb_font_t *font, void *font_data, + hb_codepoint_t glyph, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + PangoFcFont *fc_font = context->fc_font; + PangoRectangle logical; + + pango_font_get_glyph_extents ((PangoFont *) fc_font, glyph, NULL, &logical); + + return logical.width; +} + +static hb_bool_t +pango_fc_hb_font_get_glyph_extents (hb_font_t *font, void *font_data, + hb_codepoint_t glyph, + hb_glyph_extents_t *extents, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + PangoFcFont *fc_font = context->fc_font; + PangoRectangle ink; + + pango_font_get_glyph_extents ((PangoFont *) fc_font, glyph, &ink, NULL); + + if (G_LIKELY (!context->vertical)) { + extents->x_bearing = ink.x; + extents->y_bearing = ink.y; + extents->width = ink.width; + extents->height = ink.height; + } else { + /* XXX */ + extents->x_bearing = ink.x; + extents->y_bearing = ink.y; + extents->width = ink.height; + extents->height = ink.width; + } + + return TRUE; +} + +static hb_bool_t +pango_fc_hb_font_get_glyph_h_origin (hb_font_t *font, void *font_data, + hb_codepoint_t glyph, + hb_position_t *x, hb_position_t *y, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + FT_Face ft_face = context->ft_face; + int load_flags = FT_LOAD_DEFAULT; + + if (!context->vertical) return TRUE; + + if (FT_Load_Glyph (ft_face, glyph, load_flags)) + return FALSE; + + /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates + * have a Y growing upward. Hence the extra negation. */ + *x = PANGO_UNITS_26_6 (ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX); + *y = PANGO_UNITS_26_6 (ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY)); + + /* XXX */ + *x = -*x; + *y = *y; + + return TRUE; +} + +static hb_bool_t +pango_fc_hb_font_get_glyph_v_origin (hb_font_t *font, void *font_data, + hb_codepoint_t glyph, + hb_position_t *x, hb_position_t *y, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + FT_Face ft_face = context->ft_face; + int load_flags = FT_LOAD_DEFAULT; + + if (context->vertical) return TRUE; + + if (FT_Load_Glyph (ft_face, glyph, load_flags)) + return FALSE; + + /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates + * have a Y growing upward. Hence the extra negation. */ + *x = PANGO_UNITS_26_6 (ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX); + *y = PANGO_UNITS_26_6 (ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY)); + + /* XXX */ + + return TRUE; +} + + +static hb_position_t +pango_fc_hb_font_get_h_kerning (hb_font_t *font, void *font_data, + hb_codepoint_t left_glyph, hb_codepoint_t right_glyph, + void *user_data G_GNUC_UNUSED) +{ + PangoFcHbContext *context = (PangoFcHbContext *) font_data; + FT_Face ft_face = context->ft_face; + FT_Vector kerning; + + if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerning)) + return 0; + + return PANGO_UNITS_26_6 (kerning.x); +} + +static hb_font_funcs_t * +pango_fc_get_hb_font_funcs (void) +{ + static hb_font_funcs_t *funcs; + + if (G_UNLIKELY (!funcs)) { + funcs = hb_font_funcs_create (); + hb_font_funcs_set_glyph_func (funcs, pango_fc_hb_font_get_glyph, NULL, NULL); + hb_font_funcs_set_glyph_h_advance_func (funcs, pango_fc_hb_font_get_glyph_advance, NULL, NULL); + hb_font_funcs_set_glyph_v_advance_func (funcs, pango_fc_hb_font_get_glyph_advance, NULL, NULL); + hb_font_funcs_set_glyph_h_origin_func (funcs, pango_fc_hb_font_get_glyph_h_origin, NULL, NULL); + hb_font_funcs_set_glyph_v_origin_func (funcs, pango_fc_hb_font_get_glyph_v_origin, NULL, NULL); + hb_font_funcs_set_glyph_h_kerning_func (funcs, pango_fc_hb_font_get_h_kerning, NULL, NULL); + /* Don't need v_kerning. */ + hb_font_funcs_set_glyph_extents_func (funcs, pango_fc_hb_font_get_glyph_extents, NULL, NULL); + hb_font_funcs_set_glyph_contour_point_func (funcs, pango_fc_hb_font_get_glyph_contour_point, NULL, NULL); + /* Don't need glyph_name / glyph_from_name */ + } + + return funcs; +} + + + + +static void +basic_engine_shape (PangoEngineShape *engine G_GNUC_UNUSED, + PangoFont *font, + const char *item_text, + unsigned int item_length, + const PangoAnalysis *analysis, + PangoGlyphString *glyphs, + const char *paragraph_text, + unsigned int paragraph_length) +{ + PangoFcHbContext context; + PangoFcFont *fc_font; + FT_Face ft_face; + hb_face_t *hb_face; + hb_font_t *hb_font; + hb_buffer_t *hb_buffer; + hb_direction_t hb_direction; + gboolean free_buffer; + gboolean is_hinted; + hb_glyph_info_t *hb_glyph; + hb_glyph_position_t *hb_position; + int last_cluster; + guint i, num_glyphs; + unsigned int item_offset = item_text - paragraph_text; + hb_feature_t features[8]; + unsigned int num_features = 0; + + g_return_if_fail (font != NULL); + g_return_if_fail (analysis != NULL); + + fc_font = PANGO_FC_FONT (font); + ft_face = pango_fc_font_lock_face (fc_font); + if (!ft_face) + return; + + /* TODO: Cache hb_font? */ + context.ft_face = ft_face; + context.fc_font = fc_font; + context.vertical = PANGO_GRAVITY_IS_VERTICAL (analysis->gravity); + context.improper_sign = PANGO_GRAVITY_IS_IMPROPER (analysis->gravity) ? -1 : +1; + hb_face = hb_ft_face_create_cached (ft_face); + hb_font = hb_font_create (hb_face); + hb_font_set_funcs (hb_font, + pango_fc_get_hb_font_funcs (), + &context, + NULL); + hb_font_set_scale (hb_font, + /* XXX CTM */ + context.improper_sign * + (((guint64) ft_face->size->metrics.x_scale * ft_face->units_per_EM) >> 12), + context.improper_sign * + -(((guint64) ft_face->size->metrics.y_scale * ft_face->units_per_EM) >> 12)); + is_hinted = fc_font->is_hinted; + hb_font_set_ppem (hb_font, + is_hinted ? ft_face->size->metrics.x_ppem : 0, + is_hinted ? ft_face->size->metrics.y_ppem : 0); + + hb_buffer = acquire_buffer (&free_buffer); + + hb_direction = PANGO_GRAVITY_IS_VERTICAL (analysis->gravity) ? HB_DIRECTION_TTB : HB_DIRECTION_LTR; + if (analysis->level % 2) + hb_direction = HB_DIRECTION_REVERSE (hb_direction); + if (PANGO_GRAVITY_IS_IMPROPER (analysis->gravity)) + hb_direction = HB_DIRECTION_REVERSE (hb_direction); + + /* setup buffer */ + + hb_buffer_set_direction (hb_buffer, hb_direction); + hb_buffer_set_script (hb_buffer, hb_glib_script_to_script (analysis->script)); + hb_buffer_set_language (hb_buffer, hb_language_from_string (pango_language_to_string (analysis->language), -1)); + hb_buffer_set_flags (hb_buffer, + (item_offset == 0 ? HB_BUFFER_FLAG_BOT : 0) | + (item_offset + item_length == paragraph_length ? HB_BUFFER_FLAG_EOT : 0)); + + hb_buffer_add_utf8 (hb_buffer, paragraph_text, paragraph_length, item_offset, item_length); + + /* Setup features from fontconfig pattern. */ + if (fc_font->font_pattern) + { + char *s; + while (num_features < G_N_ELEMENTS (features) && + FcResultMatch == FcPatternGetString (fc_font->font_pattern, + PANGO_FC_FONT_FEATURES, + num_features, + (FcChar8 **) &s)) + { + gboolean ret = hb_feature_from_string (s, -1, &features[num_features]); + features[num_features].start = 0; + features[num_features].end = (unsigned int) -1; + if (ret) + num_features++; + } + } + + hb_shape (hb_font, hb_buffer, features, num_features); + + if (PANGO_GRAVITY_IS_IMPROPER (analysis->gravity)) + hb_buffer_reverse (hb_buffer); + + /* buffer output */ + num_glyphs = hb_buffer_get_length (hb_buffer); + hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL); + pango_glyph_string_set_size (glyphs, num_glyphs); + last_cluster = -1; + for (i = 0; i < num_glyphs; i++) + { + glyphs->glyphs[i].glyph = hb_glyph->codepoint; + glyphs->log_clusters[i] = hb_glyph->cluster - item_offset; + glyphs->glyphs[i].attr.is_cluster_start = glyphs->log_clusters[i] != last_cluster; + hb_glyph++; + last_cluster = glyphs->log_clusters[i]; + } + + hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL); + if (context.vertical) + for (i = 0; i < num_glyphs; i++) + { + unsigned int advance = hb_position->y_advance; + if (is_hinted) + advance = PANGO_UNITS_ROUND (advance); + glyphs->glyphs[i].geometry.width = advance; + /* XXX */ + glyphs->glyphs[i].geometry.x_offset = hb_position->y_offset; + glyphs->glyphs[i].geometry.y_offset = -hb_position->x_offset; + hb_position++; + } + else /* horizontal */ + for (i = 0; i < num_glyphs; i++) + { + unsigned int advance = hb_position->x_advance; + if (is_hinted) + advance = PANGO_UNITS_ROUND (advance); + glyphs->glyphs[i].geometry.width = advance; + glyphs->glyphs[i].geometry.x_offset = hb_position->x_offset; + glyphs->glyphs[i].geometry.y_offset = hb_position->y_offset; + hb_position++; + } + + release_buffer (hb_buffer, free_buffer); + hb_font_destroy (hb_font); + hb_face_destroy (hb_face); + pango_fc_font_unlock_face (fc_font); +} + +static void +basic_engine_fc_class_init (PangoEngineShapeClass *class) +{ + class->script_shape = basic_engine_shape; +} + +PANGO_ENGINE_SHAPE_DEFINE_TYPE (BasicEngineFc, basic_engine_fc, + basic_engine_fc_class_init, NULL) + +void +PANGO_MODULE_ENTRY(init) (GTypeModule *module) +{ + basic_engine_fc_register_type (module); +} + +void +PANGO_MODULE_ENTRY(exit) (void) +{ +} + +void +PANGO_MODULE_ENTRY(list) (PangoEngineInfo **engines, + int *n_engines) +{ + *engines = script_engines; + *n_engines = G_N_ELEMENTS (script_engines); +} + +PangoEngine * +PANGO_MODULE_ENTRY(create) (const char *id) +{ + if (!strcmp (id, SCRIPT_ENGINE_NAME)) + return g_object_new (basic_engine_fc_type, NULL); + else + return NULL; +} |