Index: third_party/harfbuzz-ng/src/hb-ft.cc |
diff --git a/third_party/harfbuzz-ng/src/hb-ft.cc b/third_party/harfbuzz-ng/src/hb-ft.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..23c2cc0324ec7766b43f926db1e9d7b963e6d43e |
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+++ b/third_party/harfbuzz-ng/src/hb-ft.cc |
@@ -0,0 +1,439 @@ |
+/* |
+ * Copyright © 2009 Red Hat, Inc. |
+ * Copyright © 2009 Keith Stribley |
+ * |
+ * This is part of HarfBuzz, a text shaping library. |
+ * |
+ * Permission is hereby granted, without written agreement and without |
+ * license or royalty fees, to use, copy, modify, and distribute this |
+ * software and its documentation for any purpose, provided that the |
+ * above copyright notice and the following two paragraphs appear in |
+ * all copies of this software. |
+ * |
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
+ * DAMAGE. |
+ * |
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
+ * |
+ * Red Hat Author(s): Behdad Esfahbod |
+ */ |
+ |
+#include "hb-private.hh" |
+ |
+#include "hb-ft.h" |
+ |
+#include "hb-font-private.hh" |
+ |
+#include FT_ADVANCES_H |
+#include FT_TRUETYPE_TABLES_H |
+ |
+ |
+ |
+#ifndef HB_DEBUG_FT |
+#define HB_DEBUG_FT (HB_DEBUG+0) |
+#endif |
+ |
+ |
+/* TODO: |
+ * |
+ * In general, this file does a fine job of what it's supposed to do. |
+ * There are, however, things that need more work: |
+ * |
+ * - We don't handle any load_flags. That definitely has API implications. :( |
+ * I believe hb_ft_font_create() should take load_flags input. |
+ * In particular, FT_Get_Advance() without the NO_HINTING flag seems to be |
+ * buggy. |
+ * |
+ * - We don't handle / allow for emboldening / obliqueing. |
+ * |
+ * - Rounding, etc? |
+ * |
+ * - In the future, we should add constructors to create fonts in font space. |
+ * |
+ * - I believe transforms are not correctly implemented. FreeType does not |
+ * provide any API to get to the transform/delta set on the face. :( |
+ * |
+ * - Always use FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH? |
+ */ |
+ |
+ |
+static hb_bool_t |
+hb_ft_get_glyph (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t unicode, |
+ hb_codepoint_t variation_selector, |
+ hb_codepoint_t *glyph, |
+ void *user_data HB_UNUSED) |
+ |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ |
+#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX |
+ if (unlikely (variation_selector)) { |
+ *glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector); |
+ if (*glyph) |
+ return TRUE; |
+ } |
+#endif |
+ |
+ *glyph = FT_Get_Char_Index (ft_face, unicode); |
+ return *glyph != 0; |
+} |
+ |
+static hb_position_t |
+hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t glyph, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING; |
+ FT_Fixed v; |
+ |
+ if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v))) |
+ return 0; |
+ |
+ return v >> 10; |
+} |
+ |
+static hb_position_t |
+hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t glyph, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING | FT_LOAD_VERTICAL_LAYOUT; |
+ FT_Fixed v; |
+ |
+ if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v))) |
+ return 0; |
+ |
+ /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates |
+ * have a Y growing upward. Hence the extra negation. */ |
+ return -v >> 10; |
+} |
+ |
+static hb_bool_t |
+hb_ft_get_glyph_h_origin (hb_font_t *font HB_UNUSED, |
+ void *font_data HB_UNUSED, |
+ hb_codepoint_t glyph HB_UNUSED, |
+ hb_position_t *x HB_UNUSED, |
+ hb_position_t *y HB_UNUSED, |
+ void *user_data HB_UNUSED) |
+{ |
+ /* We always work in the horizontal coordinates. */ |
+ return TRUE; |
+} |
+ |
+static hb_bool_t |
+hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t glyph, |
+ hb_position_t *x, |
+ hb_position_t *y, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ int load_flags = FT_LOAD_DEFAULT; |
+ |
+ if (unlikely (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 = ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX; |
+ *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY); |
+ |
+ return TRUE; |
+} |
+ |
+static hb_position_t |
+hb_ft_get_glyph_h_kerning (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t left_glyph, |
+ hb_codepoint_t right_glyph, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ FT_Vector kerningv; |
+ |
+ if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerningv)) |
+ return 0; |
+ |
+ return kerningv.x; |
+} |
+ |
+static hb_position_t |
+hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED, |
+ void *font_data HB_UNUSED, |
+ hb_codepoint_t top_glyph HB_UNUSED, |
+ hb_codepoint_t bottom_glyph HB_UNUSED, |
+ void *user_data HB_UNUSED) |
+{ |
+ /* FreeType API doesn't support vertical kerning */ |
+ return 0; |
+} |
+ |
+static hb_bool_t |
+hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t glyph, |
+ hb_glyph_extents_t *extents, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ int load_flags = FT_LOAD_DEFAULT; |
+ |
+ if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags))) |
+ return FALSE; |
+ |
+ extents->x_bearing = ft_face->glyph->metrics.horiBearingX; |
+ extents->y_bearing = ft_face->glyph->metrics.horiBearingY; |
+ extents->width = ft_face->glyph->metrics.width; |
+ extents->height = ft_face->glyph->metrics.height; |
+ return TRUE; |
+} |
+ |
+static hb_bool_t |
+hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED, |
+ void *font_data, |
+ hb_codepoint_t glyph, |
+ unsigned int point_index, |
+ hb_position_t *x, |
+ hb_position_t *y, |
+ void *user_data HB_UNUSED) |
+{ |
+ FT_Face ft_face = (FT_Face) font_data; |
+ int load_flags = FT_LOAD_DEFAULT; |
+ |
+ if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags))) |
+ return FALSE; |
+ |
+ if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE)) |
+ return FALSE; |
+ |
+ if (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; |
+} |
+ |
+static hb_font_funcs_t ft_ffuncs = { |
+ HB_OBJECT_HEADER_STATIC, |
+ |
+ TRUE, /* immutable */ |
+ |
+ { |
+ hb_ft_get_glyph, |
+ hb_ft_get_glyph_h_advance, |
+ hb_ft_get_glyph_v_advance, |
+ hb_ft_get_glyph_h_origin, |
+ hb_ft_get_glyph_v_origin, |
+ hb_ft_get_glyph_h_kerning, |
+ hb_ft_get_glyph_v_kerning, |
+ hb_ft_get_glyph_extents, |
+ hb_ft_get_glyph_contour_point, |
+ } |
+}; |
+ |
+static hb_font_funcs_t * |
+_hb_ft_get_font_funcs (void) |
+{ |
+ return &ft_ffuncs; |
+} |
+ |
+ |
+static hb_blob_t * |
+reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) |
+{ |
+ FT_Face ft_face = (FT_Face) user_data; |
+ FT_Byte *buffer; |
+ FT_ULong length = 0; |
+ FT_Error error; |
+ |
+ /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */ |
+ |
+ error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length); |
+ if (error) |
+ return NULL; |
+ |
+ buffer = (FT_Byte *) malloc (length); |
+ if (buffer == NULL) |
+ return NULL; |
+ |
+ error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length); |
+ if (error) |
+ return NULL; |
+ |
+ return hb_blob_create ((const char *) buffer, length, |
+ HB_MEMORY_MODE_WRITABLE, |
+ buffer, free); |
+} |
+ |
+ |
+hb_face_t * |
+hb_ft_face_create (FT_Face ft_face, |
+ hb_destroy_func_t destroy) |
+{ |
+ hb_face_t *face; |
+ |
+ if (ft_face->stream->read == NULL) { |
+ hb_blob_t *blob; |
+ |
+ blob = hb_blob_create ((const char *) ft_face->stream->base, |
+ (unsigned int) ft_face->stream->size, |
+ /* TODO: We assume that it's mmap()'ed, but FreeType code |
+ * suggests that there are cases we reach here but font is |
+ * not mmapped. For example, when mmap() fails. No idea |
+ * how to deal with it better here. */ |
+ HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE, |
+ ft_face, destroy); |
+ face = hb_face_create (blob, ft_face->face_index); |
+ hb_blob_destroy (blob); |
+ } else { |
+ face = hb_face_create_for_tables (reference_table, ft_face, destroy); |
+ } |
+ |
+ hb_face_set_index (face, ft_face->face_index); |
+ hb_face_set_upem (face, ft_face->units_per_EM); |
+ |
+ return face; |
+} |
+ |
+static void |
+hb_ft_face_finalize (FT_Face ft_face) |
+{ |
+ hb_face_destroy ((hb_face_t *) ft_face->generic.data); |
+} |
+ |
+hb_face_t * |
+hb_ft_face_create_cached (FT_Face ft_face) |
+{ |
+ if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize)) |
+ { |
+ if (ft_face->generic.finalizer) |
+ ft_face->generic.finalizer (ft_face); |
+ |
+ ft_face->generic.data = hb_ft_face_create (ft_face, NULL); |
+ ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize; |
+ } |
+ |
+ return hb_face_reference ((hb_face_t *) ft_face->generic.data); |
+} |
+ |
+static void |
+_do_nothing (void) |
+{ |
+} |
+ |
+ |
+hb_font_t * |
+hb_ft_font_create (FT_Face ft_face, |
+ hb_destroy_func_t destroy) |
+{ |
+ hb_font_t *font; |
+ hb_face_t *face; |
+ |
+ face = hb_ft_face_create (ft_face, destroy); |
+ font = hb_font_create (face); |
+ hb_face_destroy (face); |
+ hb_font_set_funcs (font, |
+ _hb_ft_get_font_funcs (), |
+ ft_face, (hb_destroy_func_t) _do_nothing); |
+ hb_font_set_scale (font, |
+ ((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16, |
+ ((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16); |
+ hb_font_set_ppem (font, |
+ ft_face->size->metrics.x_ppem, |
+ ft_face->size->metrics.y_ppem); |
+ |
+ return font; |
+} |
+ |
+ |
+ |
+ |
+static FT_Library ft_library; |
+static hb_bool_t ft_library_initialized; |
+static struct ft_library_destructor { |
+ ~ft_library_destructor (void) { |
+ if (ft_library) |
+ FT_Done_FreeType (ft_library); |
+ } |
+} static_ft_library_destructor; |
+ |
+static FT_Library |
+_get_ft_library (void) |
+{ |
+ if (unlikely (!ft_library_initialized)) { |
+ FT_Init_FreeType (&ft_library); |
+ ft_library_initialized = TRUE; |
+ } |
+ |
+ return ft_library; |
+} |
+ |
+static void |
+_release_blob (FT_Face ft_face) |
+{ |
+ hb_blob_destroy ((hb_blob_t *) ft_face->generic.data); |
+} |
+ |
+void |
+hb_ft_font_set_funcs (hb_font_t *font) |
+{ |
+ hb_blob_t *blob = hb_face_reference_blob (font->face); |
+ unsigned int blob_length; |
+ const char *blob_data = hb_blob_get_data (blob, &blob_length); |
+ if (unlikely (!blob_length)) |
+ DEBUG_MSG (FT, font, "Font face has empty blob"); |
+ |
+ FT_Face ft_face = NULL; |
+ FT_Error err = FT_New_Memory_Face (_get_ft_library (), |
+ (const FT_Byte *) blob_data, |
+ blob_length, |
+ hb_face_get_index (font->face), |
+ &ft_face); |
+ |
+ if (unlikely (err)) { |
+ hb_blob_destroy (blob); |
+ DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed"); |
+ return; |
+ } |
+ |
+ FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE); |
+ |
+ FT_Set_Char_Size (ft_face, |
+ font->x_scale, font->y_scale, |
+ font->x_ppem * 72 * 64 / font->x_scale, |
+ font->y_ppem * 72 * 64 / font->y_scale); |
+ |
+ ft_face->generic.data = blob; |
+ ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob; |
+ |
+ hb_font_set_funcs (font, |
+ _hb_ft_get_font_funcs (), |
+ ft_face, |
+ (hb_destroy_func_t) FT_Done_Face); |
+} |
+ |
+FT_Face |
+hb_ft_font_get_face (hb_font_t *font) |
+{ |
+ if (font->destroy == (hb_destroy_func_t) FT_Done_Face || |
+ font->destroy == (hb_destroy_func_t) _do_nothing) |
+ return (FT_Face) font->user_data; |
+ |
+ return NULL; |
+} |