diff options
Diffstat (limited to 'src/cairo-ft-font.c')
| -rw-r--r-- | src/cairo-ft-font.c | 449 |
1 files changed, 307 insertions, 142 deletions
diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c index c3e4306d7..77cf59b0d 100644 --- a/src/cairo-ft-font.c +++ b/src/cairo-ft-font.c @@ -25,7 +25,10 @@ #include "cairoint.h" #include <fontconfig/fontconfig.h> #include <fontconfig/fcfreetype.h> -#include <freetype/freetype.h> + +#include <ft2build.h> +#include FT_FREETYPE_H +#include FT_OUTLINE_H typedef struct { cairo_font_t base; @@ -39,13 +42,10 @@ typedef struct { FcPattern *pattern; } cairo_ft_font_t; - -#define DOUBLE_TO_26_6(d) ((FT_F26Dot6)((d) * 63.0)) -#define DOUBLE_FROM_26_6(t) (((double)((t) >> 6)) \ - + ((double)((t) & 0x3F) / 63.0)) -#define DOUBLE_TO_16_16(d) ((FT_Fixed)((d) * 65535.0)) -#define DOUBLE_FROM_16_16(t) (((double)((t) >> 16)) \ - + ((double)((t) & 0xFFFF) / 65535.0)) +#define DOUBLE_TO_26_6(d) ((FT_F26Dot6)((d) * 64.0)) +#define DOUBLE_FROM_26_6(t) ((double)(t) / 64.0) +#define DOUBLE_TO_16_16(d) ((FT_Fixed)((d) * 65536.0)) +#define DOUBLE_FROM_16_16(t) ((double)(t) / 65536.0) /* implement the platform-specific interface */ @@ -101,29 +101,31 @@ cairo_ft_font_create (FT_Library ft_library, FcPattern *pattern) } FT_Face -cairo_ft_font_face (cairo_font_t *font) +cairo_ft_font_face (cairo_font_t *abstract_font) { + cairo_ft_font_t *font = (cairo_ft_font_t *) abstract_font; + if (font == NULL) return NULL; - return ((cairo_ft_font_t *) font)->face; + return font->face; } FcPattern * -cairo_ft_font_pattern (cairo_font_t *font) +cairo_ft_font_pattern (cairo_font_t *abstract_font) { + cairo_ft_font_t *font = (cairo_ft_font_t *) abstract_font; + if (font == NULL) return NULL; - return ((cairo_ft_font_t *) font)->pattern; + return font->pattern; } - - /* implement the backend interface */ static cairo_font_t * -_cairo_ft_font_create (char *family, +_cairo_ft_font_create (const char *family, cairo_font_slant_t slant, cairo_font_weight_t weight) { @@ -175,6 +177,9 @@ _cairo_ft_font_create (char *family, } font = cairo_ft_font_create (ft_library, pat); + if (font == NULL) + return NULL; + ft_font = (cairo_ft_font_t *) font; ft_font->owns_ft_library = 1; @@ -188,45 +193,43 @@ _cairo_ft_font_create (char *family, return font; } - static cairo_font_t * -_cairo_ft_font_copy (cairo_font_t *font) +_cairo_ft_font_copy (void *abstract_font) { - cairo_ft_font_t * ft_font_new = NULL; - cairo_ft_font_t * ft_font = NULL; + cairo_ft_font_t * font_new = NULL; + cairo_ft_font_t * font = abstract_font; - ft_font = (cairo_ft_font_t *)font; + if (font->base.backend != &cairo_ft_font_backend) + return NULL; - ft_font_new = (cairo_ft_font_t *)cairo_ft_font_create_for_ft_face (ft_font->face); - if (ft_font_new == NULL) + font_new = (cairo_ft_font_t *) cairo_ft_font_create_for_ft_face (font->face); + if (font_new == NULL) return NULL; - if (ft_font_new != NULL && ft_font->pattern != NULL) - ft_font_new->pattern = FcPatternDuplicate (ft_font->pattern); + if (font_new != NULL && font->pattern != NULL) + font_new->pattern = FcPatternDuplicate (font->pattern); - return (cairo_font_t *)ft_font_new; + return (cairo_font_t *) font_new; } static void -_cairo_ft_font_destroy (cairo_font_t *font) +_cairo_ft_font_destroy (void *abstract_font) { - cairo_ft_font_t * ft_font = NULL; + cairo_ft_font_t * font = abstract_font; if (font == NULL) return; - ft_font = (cairo_ft_font_t *)font; - - if (ft_font->face != NULL && ft_font->owns_face) - FT_Done_Face (ft_font->face); + if (font->face != NULL && font->owns_face) + FT_Done_Face (font->face); - if (ft_font->pattern != NULL) - FcPatternDestroy (ft_font->pattern); + if (font->pattern != NULL) + FcPatternDestroy (font->pattern); - if (ft_font->ft_library && ft_font->owns_ft_library) - FT_Done_FreeType (ft_font->ft_library); + if (font->ft_library && font->owns_ft_library) + FT_Done_FreeType (font->ft_library); - free (ft_font); + free (font); } static void @@ -260,21 +263,7 @@ _utf8_to_ucs4 (char const *utf8, len -= step; utf8 += step; } - *nchars = alloc; -} - -static void -_get_scale_factors(cairo_matrix_t *matrix, double *sx, double *sy) -{ - double e0, e1; - e1 = 1.; e0 = 0.; - - cairo_matrix_transform_distance (matrix, &e1, &e0); - *sx = sqrt(e1*e1 + e0*e0); - - e1 = 1.; e0 = 0.; - cairo_matrix_transform_distance (matrix, &e0, &e1); - *sy = sqrt(e1*e1 + e0*e0); + *nchars = n; } static void @@ -292,7 +281,7 @@ _install_font_matrix(cairo_matrix_t *matrix, FT_Face face) * transformation. */ - _get_scale_factors(matrix, &scale_x, &scale_y); + _cairo_matrix_compute_scale_factors (matrix, &scale_x, &scale_y); cairo_matrix_copy (&normalized, matrix); @@ -314,23 +303,19 @@ _install_font_matrix(cairo_matrix_t *matrix, FT_Face face) 0, 0); } - static int -_utf8_to_glyphs (cairo_font_t *font, - const unsigned char *utf8, - cairo_glyph_t **glyphs, - size_t *nglyphs) +_utf8_to_glyphs (cairo_ft_font_t *font, + const unsigned char *utf8, + double x0, + double y0, + cairo_glyph_t **glyphs, + size_t *nglyphs) { - cairo_ft_font_t *ft; + FT_Face face = font->face; double x = 0., y = 0.; size_t i; FT_ULong *ucs4 = NULL; - if (font == NULL) - return 0; - - ft = (cairo_ft_font_t *)font; - _utf8_to_ucs4 (utf8, &ucs4, nglyphs); if (ucs4 == NULL) @@ -343,18 +328,18 @@ _utf8_to_glyphs (cairo_font_t *font, return 0; } - _install_font_matrix (&font->matrix, ft->face); + _install_font_matrix (&font->base.matrix, face); for (i = 0; i < *nglyphs; i++) { - (*glyphs)[i].index = FT_Get_Char_Index (ft->face, ucs4[i]); - (*glyphs)[i].x = x; - (*glyphs)[i].y = y; + (*glyphs)[i].index = FT_Get_Char_Index (face, ucs4[i]); + (*glyphs)[i].x = x0 + x; + (*glyphs)[i].y = y0 + y; - FT_Load_Glyph (ft->face, (*glyphs)[i].index, FT_LOAD_DEFAULT); + FT_Load_Glyph (face, (*glyphs)[i].index, FT_LOAD_DEFAULT); - x += DOUBLE_FROM_26_6 (ft->face->glyph->advance.x); - y -= DOUBLE_FROM_26_6 (ft->face->glyph->advance.y); + x += DOUBLE_FROM_26_6 (face->glyph->advance.x); + y -= DOUBLE_FROM_26_6 (face->glyph->advance.y); } free (ucs4); @@ -362,51 +347,114 @@ _utf8_to_glyphs (cairo_font_t *font, } static cairo_status_t -_cairo_ft_font_font_extents (cairo_font_t *font, - cairo_font_extents_t *extents) +_cairo_ft_font_font_extents (void *abstract_font, + cairo_font_extents_t *extents) { + cairo_ft_font_t *font = abstract_font; + FT_Face face = font->face; double scale_x, scale_y; - cairo_ft_font_t *ft = (cairo_ft_font_t *)font; - cairo_status_t status = CAIRO_STATUS_SUCCESS; - _get_scale_factors(&font->matrix, &scale_x, &scale_y); + double upm = face->units_per_EM; -#define FONT_UNIT_TO_DEV(x) ((double)(x) / (double)(ft->face->units_per_EM)) + _cairo_matrix_compute_scale_factors (&font->base.matrix, &scale_x, &scale_y); - extents->ascent = FONT_UNIT_TO_DEV(ft->face->ascender) * scale_y; - extents->descent = FONT_UNIT_TO_DEV(ft->face->descender) * scale_y; - extents->height = FONT_UNIT_TO_DEV(ft->face->height) * scale_y; - extents->max_x_advance = FONT_UNIT_TO_DEV(ft->face->max_advance_width) * scale_x; - extents->max_y_advance = FONT_UNIT_TO_DEV(ft->face->max_advance_height) * scale_y; - return status; + extents->ascent = face->ascender / upm * scale_y; + extents->descent = face->descender / upm * scale_y; + extents->height = face->height / upm * scale_y; + extents->max_x_advance = face->max_advance_width / upm * scale_x; + extents->max_y_advance = face->max_advance_height / upm * scale_y; + + return CAIRO_STATUS_SUCCESS; } static cairo_status_t -_cairo_ft_font_glyph_extents (cairo_font_t *font, - cairo_glyph_t *glyphs, - int num_glyphs, - cairo_text_extents_t *extents) +_cairo_ft_font_glyph_extents (void *abstract_font, + cairo_glyph_t *glyphs, + int num_glyphs, + cairo_text_extents_t *extents) { - cairo_ft_font_t *ft; - cairo_status_t status = CAIRO_STATUS_SUCCESS; + int i; + cairo_ft_font_t *font = abstract_font; + cairo_point_double_t origin; + cairo_point_double_t glyph_min, glyph_max; + cairo_point_double_t total_min, total_max; + FT_Error error; + FT_Face face = font->face; + FT_GlyphSlot glyph = face->glyph; + FT_Glyph_Metrics *metrics = &glyph->metrics; - ft = (cairo_ft_font_t *)font; + if (num_glyphs == 0) + { + extents->x_bearing = 0.0; + extents->y_bearing = 0.0; + extents->width = 0.0; + extents->height = 0.0; + extents->x_advance = 0.0; + extents->y_advance = 0.0; + + return CAIRO_STATUS_SUCCESS; + } - /* FIXME: lift code from xft to do this */ + origin.x = glyphs[0].x; + origin.y = glyphs[0].y; - return status; + _install_font_matrix (&font->base.matrix, face); + + for (i = 0; i < num_glyphs; i++) + { + error = FT_Load_Glyph (face, glyphs[i].index, FT_LOAD_DEFAULT); + /* XXX: What to do in this error case? */ + if (error) + continue; + + /* XXX: Need to add code here to check the font's FcPattern + for FC_VERTICAL_LAYOUT and if set get vertBearingX/Y + instead. This will require that + cairo_ft_font_create_for_ft_face accept an + FcPattern. */ + glyph_min.x = glyphs[i].x + DOUBLE_FROM_26_6 (metrics->horiBearingX); + glyph_min.y = glyphs[i].y - DOUBLE_FROM_26_6 (metrics->horiBearingY); + glyph_max.x = glyph_min.x + DOUBLE_FROM_26_6 (metrics->width); + glyph_max.y = glyph_min.y + DOUBLE_FROM_26_6 (metrics->height); + + if (i==0) { + total_min = glyph_min; + total_max = glyph_max; + } else { + if (glyph_min.x < total_min.x) + total_min.x = glyph_min.x; + if (glyph_min.y < total_min.y) + total_min.y = glyph_min.y; + + if (glyph_max.x > total_max.x) + total_max.x = glyph_max.x; + if (glyph_max.y > total_max.y) + total_max.y = glyph_max.y; + } + } + + extents->x_bearing = total_min.x - origin.x; + extents->y_bearing = total_min.y - origin.y; + extents->width = total_max.x - total_min.x; + extents->height = total_max.y - total_min.y; + extents->x_advance = glyphs[i-1].x + DOUBLE_FROM_26_6 (metrics->horiAdvance) - origin.x; + extents->y_advance = glyphs[i-1].y + 0 - origin.y; + + return CAIRO_STATUS_SUCCESS; } + static cairo_status_t -_cairo_ft_font_text_extents (cairo_font_t *font, - const unsigned char *utf8, - cairo_text_extents_t *extents) +_cairo_ft_font_text_extents (void *abstract_font, + const unsigned char *utf8, + cairo_text_extents_t *extents) { + cairo_ft_font_t *font = abstract_font; cairo_glyph_t *glyphs; size_t nglyphs; cairo_status_t status = CAIRO_STATUS_SUCCESS; - if (_utf8_to_glyphs (font, utf8, &glyphs, &nglyphs)) + if (_utf8_to_glyphs (font, utf8, 0, 0, &glyphs, &nglyphs)) { status = _cairo_ft_font_glyph_extents (font, glyphs, nglyphs, extents); @@ -414,24 +462,22 @@ _cairo_ft_font_text_extents (cairo_font_t *font, } return status; } - - static cairo_status_t -_cairo_ft_font_show_glyphs (cairo_font_t *font, +_cairo_ft_font_show_glyphs (void *abstract_font, cairo_operator_t operator, cairo_surface_t *source, cairo_surface_t *surface, - double x0, - double y0, const cairo_glyph_t *glyphs, int num_glyphs) { + cairo_ft_font_t *font = abstract_font; cairo_status_t status; int i; cairo_ft_font_t *ft = NULL; FT_GlyphSlot glyphslot; cairo_surface_t *mask = NULL; + cairo_point_double_t origin; double x, y; int width, height, stride; @@ -444,22 +490,27 @@ _cairo_ft_font_show_glyphs (cairo_font_t *font, ft = (cairo_ft_font_t *)font; glyphslot = ft->face->glyph; - _install_font_matrix (&font->matrix, ft->face); + _install_font_matrix (&font->base.matrix, ft->face); for (i = 0; i < num_glyphs; i++) { unsigned char *bitmap; FT_Load_Glyph (ft->face, glyphs[i].index, FT_LOAD_DEFAULT); - FT_Render_Glyph (glyphslot, FT_RENDER_MODE_NORMAL); + FT_Render_Glyph (glyphslot, ft_render_mode_normal); width = glyphslot->bitmap.width; height = glyphslot->bitmap.rows; stride = glyphslot->bitmap.pitch; bitmap = glyphslot->bitmap.buffer; - x = x0 + glyphs[i].x; - y = y0 + glyphs[i].y; + x = glyphs[i].x; + y = glyphs[i].y; + + if (i == 0) { + origin.x = x; + origin.y = y; + } /* X gets upset with zero-sized images (such as whitespace) */ if (width * height == 0) @@ -502,11 +553,14 @@ _cairo_ft_font_show_glyphs (cairo_font_t *font, return CAIRO_STATUS_NO_MEMORY; } - status = _cairo_surface_composite (operator, source, mask, surface, - 0, 0, 0, 0, - x + glyphslot->bitmap_left, - y - glyphslot->bitmap_top, - (double)width, (double)height); + status = + _cairo_surface_composite (operator, source, mask, surface, + -origin.x + x + glyphslot->bitmap_left, + -origin.y + y - glyphslot->bitmap_top, + 0, 0, + x + glyphslot->bitmap_left, + y - glyphslot->bitmap_top, + (double) width, (double) height); cairo_surface_destroy (mask); if (bitmap != glyphslot->bitmap.buffer) @@ -519,7 +573,7 @@ _cairo_ft_font_show_glyphs (cairo_font_t *font, } static cairo_status_t -_cairo_ft_font_show_text (cairo_font_t *font, +_cairo_ft_font_show_text (void *abstract_font, cairo_operator_t operator, cairo_surface_t *source, cairo_surface_t *surface, @@ -527,15 +581,16 @@ _cairo_ft_font_show_text (cairo_font_t *font, double y0, const unsigned char *utf8) { + cairo_ft_font_t *font = abstract_font; cairo_glyph_t *glyphs; - size_t nglyphs; + int num_glyphs; - if (_utf8_to_glyphs (font, utf8, &glyphs, &nglyphs)) + if (_utf8_to_glyphs (font, utf8, x0, y0, &glyphs, &num_glyphs)) { cairo_status_t res; res = _cairo_ft_font_show_glyphs (font, operator, - source, surface, x0, y0, - glyphs, nglyphs); + source, surface, + glyphs, num_glyphs); free (glyphs); return res; } @@ -543,35 +598,147 @@ _cairo_ft_font_show_text (cairo_font_t *font, return CAIRO_STATUS_NO_MEMORY; } +static int +_move_to (FT_Vector *to, void *closure) +{ + cairo_path_t *path = closure; + cairo_point_t point; + + point.x = _cairo_fixed_from_26_6 (to->x); + point.y = _cairo_fixed_from_26_6 (to->y); + + _cairo_path_close_path (path); + _cairo_path_move_to (path, &point); + + return 0; +} + +static int +_line_to (FT_Vector *to, void *closure) +{ + cairo_path_t *path = closure; + cairo_point_t point; + + point.x = _cairo_fixed_from_26_6 (to->x); + point.y = _cairo_fixed_from_26_6 (to->y); + + _cairo_path_line_to (path, &point); + + return 0; +} + +static int +_conic_to (FT_Vector *control, FT_Vector *to, void *closure) +{ + cairo_path_t *path = closure; + + cairo_point_t p0, p1, p2, p3; + cairo_point_t conic; + + _cairo_path_current_point (path, &p0); + + conic.x = _cairo_fixed_from_26_6 (control->x); + conic.y = _cairo_fixed_from_26_6 (control->y); + + p3.x = _cairo_fixed_from_26_6 (to->x); + p3.y = _cairo_fixed_from_26_6 (to->y); + + p1.x = p0.x + 2.0/3.0 * (conic.x - p0.x); + p1.y = p0.y + 2.0/3.0 * (conic.y - p0.y); + + p2.x = p3.x + 2.0/3.0 * (conic.x - p3.x); + p2.y = p3.y + 2.0/3.0 * (conic.y - p3.y); + + _cairo_path_curve_to (path, + &p1, &p2, &p3); + + return 0; +} + +static int +_cubic_to (FT_Vector *control1, FT_Vector *control2, FT_Vector *to, void *closure) +{ + cairo_path_t *path = closure; + cairo_point_t p0, p1, p2; + + p0.x = _cairo_fixed_from_26_6 (control1->x); + p0.y = _cairo_fixed_from_26_6 (control1->y); + + p1.x = _cairo_fixed_from_26_6 (control2->x); + p1.y = _cairo_fixed_from_26_6 (control2->y); + + p2.x = _cairo_fixed_from_26_6 (to->x); + p2.y = _cairo_fixed_from_26_6 (to->y); + + _cairo_path_curve_to (path, &p0, &p1, &p2); + + return 0; +} static cairo_status_t -_cairo_ft_font_glyph_path (cairo_font_t *font, - cairo_path_t *path, - cairo_glyph_t *glyphs, - int num_glyphs) +_cairo_ft_font_glyph_path (void *abstract_font, + cairo_glyph_t *glyphs, + int num_glyphs, + cairo_path_t *path) { - cairo_status_t status = CAIRO_STATUS_SUCCESS; - cairo_ft_font_t *ft; - - ft = (cairo_ft_font_t *)font; - - /* FIXME: lift code from xft to do this */ + int i; + cairo_ft_font_t *font = abstract_font; + FT_GlyphSlot glyph; + FT_Error error; + FT_Outline_Funcs outline_funcs = { + _move_to, + _line_to, + _conic_to, + _cubic_to, + 0, /* shift */ + 0, /* delta */ + }; + + glyph = font->face->glyph; + _install_font_matrix (&font->base.matrix, font->face); + + for (i = 0; i < num_glyphs; i++) + { + FT_Matrix invert_y = { + DOUBLE_TO_16_16 (1.0), 0, + 0, DOUBLE_TO_16_16 (-1.0), + }; + + error = FT_Load_Glyph (font->face, glyphs[i].index, FT_LOAD_DEFAULT); + /* XXX: What to do in this error case? */ + if (error) + continue; + /* XXX: Do we want to support bitmap fonts here? */ + if (glyph->format == ft_glyph_format_bitmap) + continue; + + /* Font glyphs have an inverted Y axis compared to cairo. */ + FT_Outline_Transform (&glyph->outline, &invert_y); + FT_Outline_Translate (&glyph->outline, + DOUBLE_TO_26_6(glyphs[i].x), + DOUBLE_TO_26_6(glyphs[i].y)); + FT_Outline_Decompose (&glyph->outline, &outline_funcs, path); + } + _cairo_path_close_path (path); - return status; + return CAIRO_STATUS_SUCCESS; } static cairo_status_t -_cairo_ft_font_text_path (cairo_font_t *font, - cairo_path_t *path, - const unsigned char *utf8) +_cairo_ft_font_text_path (void *abstract_font, + double x, + double y, + const unsigned char *utf8, + cairo_path_t *path) { + cairo_ft_font_t *font = abstract_font; cairo_glyph_t *glyphs; size_t nglyphs; - if (_utf8_to_glyphs (font, utf8, &glyphs, &nglyphs)) + if (_utf8_to_glyphs (font, utf8, x, y, &glyphs, &nglyphs)) { cairo_status_t res; - res = _cairo_ft_font_glyph_path (font, path, glyphs, nglyphs); + res = _cairo_ft_font_glyph_path (font, glyphs, nglyphs, path); free (glyphs); return res; } @@ -579,7 +746,6 @@ _cairo_ft_font_text_path (cairo_font_t *font, return CAIRO_STATUS_NO_MEMORY; } - cairo_font_t * cairo_ft_font_create_for_ft_face (FT_Face face) { @@ -602,16 +768,15 @@ cairo_ft_font_create_for_ft_face (FT_Face face) return (cairo_font_t *) f; } - const struct cairo_font_backend cairo_ft_font_backend = { - font_extents: (void *) _cairo_ft_font_font_extents, - text_extents: (void *) _cairo_ft_font_text_extents, - glyph_extents: (void *) _cairo_ft_font_glyph_extents, - show_text: (void *) _cairo_ft_font_show_text, - show_glyphs: (void *) _cairo_ft_font_show_glyphs, - text_path: (void *) _cairo_ft_font_text_path, - glyph_path: (void *) _cairo_ft_font_glyph_path, - create: (void *) _cairo_ft_font_create, - copy: (void *) _cairo_ft_font_copy, - destroy: (void *) _cairo_ft_font_destroy + _cairo_ft_font_create, + _cairo_ft_font_copy, + _cairo_ft_font_destroy, + _cairo_ft_font_font_extents, + _cairo_ft_font_text_extents, + _cairo_ft_font_glyph_extents, + _cairo_ft_font_show_text, + _cairo_ft_font_show_glyphs, + _cairo_ft_font_text_path, + _cairo_ft_font_glyph_path, }; |