| #include <stdint.h> |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #include FT_TRUETYPE_TABLES_H |
| |
| #if 0 |
| #include <freetype/freetype.h> |
| #include <freetype/tttables.h> |
| #endif |
| |
| #include <harfbuzz-shaper.h> |
| #include "harfbuzz-unicode.h" |
| |
| static HB_Bool |
| hb_freetype_string_to_glyphs(HB_Font font, |
| const HB_UChar16 *chars, hb_uint32 len, |
| HB_Glyph *glyphs, hb_uint32 *numGlyphs, |
| HB_Bool is_rtl) { |
| FT_Face face = (FT_Face) font->userData; |
| if (len > *numGlyphs) |
| return 0; |
| |
| size_t i = 0, j = 0; |
| while (i < len) { |
| const uint32_t cp = utf16_to_code_point(chars, len, &i); |
| glyphs[j++] = FT_Get_Char_Index(face, cp); |
| } |
| |
| *numGlyphs = j; |
| |
| return 1; |
| } |
| |
| static void |
| hb_freetype_advances_get(HB_Font font, const HB_Glyph *glyphs, hb_uint32 len, |
| HB_Fixed *advances, int flags) { |
| FT_Face face = (FT_Face) font->userData; |
| |
| hb_uint32 i; |
| for (i = 0; i < len; ++i) { |
| const FT_Error error = FT_Load_Glyph(face, glyphs[i], FT_LOAD_DEFAULT); |
| if (error) { |
| advances[i] = 0; |
| continue; |
| } |
| |
| advances[i] = face->glyph->advance.x; |
| } |
| } |
| |
| static HB_Bool |
| hb_freetype_can_render(HB_Font font, const HB_UChar16 *chars, hb_uint32 len) { |
| FT_Face face = (FT_Face)font->userData; |
| |
| size_t i = 0; |
| while (i < len) { |
| const uint32_t cp = utf16_to_code_point(chars, len, &i); |
| if (FT_Get_Char_Index(face, cp) == 0) |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static HB_Error |
| hb_freetype_outline_point_get(HB_Font font, HB_Glyph glyph, int flags, |
| hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, |
| hb_uint32 *n_points) { |
| HB_Error error = HB_Err_Ok; |
| FT_Face face = (FT_Face) font->userData; |
| |
| int load_flags = (flags & HB_ShaperFlag_UseDesignMetrics) ? FT_LOAD_NO_HINTING : FT_LOAD_DEFAULT; |
| |
| if ((error = (HB_Error) FT_Load_Glyph(face, glyph, load_flags))) |
| return error; |
| |
| if (face->glyph->format != ft_glyph_format_outline) |
| return (HB_Error)HB_Err_Invalid_SubTable; |
| |
| *n_points = face->glyph->outline.n_points; |
| if (!(*n_points)) |
| return HB_Err_Ok; |
| |
| if (point > *n_points) |
| return (HB_Error)HB_Err_Invalid_SubTable; |
| |
| *xpos = face->glyph->outline.points[point].x; |
| *ypos = face->glyph->outline.points[point].y; |
| |
| return HB_Err_Ok; |
| } |
| |
| static void |
| hb_freetype_glyph_metrics_get(HB_Font font, HB_Glyph glyph, |
| HB_GlyphMetrics *metrics) { |
| FT_Face face = (FT_Face) font->userData; |
| |
| const FT_Error error = FT_Load_Glyph(face, glyph, FT_LOAD_DEFAULT); |
| if (error) { |
| metrics->x = metrics->y = metrics->width = metrics->height = 0; |
| metrics->xOffset = metrics->yOffset = 0; |
| return; |
| } |
| |
| const FT_Glyph_Metrics *ftmetrics = &face->glyph->metrics; |
| metrics->width = ftmetrics->width; |
| metrics->height = ftmetrics->height; |
| metrics->x = ftmetrics->horiAdvance; |
| metrics->y = 0; // unclear what this is |
| metrics->xOffset = ftmetrics->horiBearingX; |
| metrics->yOffset = ftmetrics->horiBearingY; |
| } |
| |
| static HB_Fixed |
| hb_freetype_font_metric_get(HB_Font font, HB_FontMetric metric) { |
| FT_Face face = (FT_Face) font->userData; |
| |
| switch (metric) { |
| case HB_FontAscent: |
| // Note that we aren't scanning the VDMX table which we probably would in |
| // an ideal world. |
| return face->ascender; |
| default: |
| return 0; |
| } |
| } |
| |
| const HB_FontClass hb_freetype_class = { |
| hb_freetype_string_to_glyphs, |
| hb_freetype_advances_get, |
| hb_freetype_can_render, |
| hb_freetype_outline_point_get, |
| hb_freetype_glyph_metrics_get, |
| hb_freetype_font_metric_get, |
| }; |
| |
| HB_Error |
| hb_freetype_table_sfnt_get(void *voidface, const HB_Tag tag, HB_Byte *buffer, HB_UInt *len) { |
| FT_Face face = (FT_Face) voidface; |
| FT_ULong ftlen = *len; |
| |
| if (!FT_IS_SFNT(face)) |
| return HB_Err_Invalid_Argument; |
| |
| const FT_Error error = FT_Load_Sfnt_Table(face, tag, 0, buffer, &ftlen); |
| *len = ftlen; |
| return (HB_Error) error; |
| } |