Mercurial > MadButterfly
view src/shape_text.c @ 82:4bb6451ef036
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author | Thinker K.F. Li <thinker@branda.to> |
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date | Thu, 21 Aug 2008 14:13:50 +0800 |
parents | 9ab15ebc9061 |
children | dd813dcc232c |
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #include <cairo.h> #include "mb_types.h" #include "shapes.h" #define OK 0 #define ERR -1 typedef struct _sh_text { shape_t shape; char *data; co_aix x, y; co_aix d_x, d_y; /* device x and y */ co_aix font_size; co_aix d_font_size; cairo_font_face_t *face; cairo_scaled_font_t *scaled_font; int flags; } sh_text_t; #define TXF_SCALE_DIRTY 0x1 static void sh_text_free(shape_t *shape) { sh_text_t *text = (sh_text_t *)shape; if(text->scaled_font) cairo_scaled_font_destroy(text->scaled_font); cairo_font_face_destroy(text->face); } shape_t *sh_text_new(const char *txt, co_aix x, co_aix y, co_aix font_size, cairo_font_face_t *face) { sh_text_t *text; text = (sh_text_t *)malloc(sizeof(sh_text_t)); if(text == NULL) return NULL; memset(text, 0, sizeof(sh_text_t)); text->shape.sh_type = SHT_TEXT; text->data = strdup(txt); if(text->data == NULL) { free(text); return NULL; } text->x = x; text->y = y; text->font_size = font_size; cairo_font_face_reference(face); text->face = face; text->flags |= TXF_SCALE_DIRTY; text->shape.free = sh_text_free; return (shape_t *)text; } static int get_extents(sh_text_t *text, cairo_text_extents_t *extents) { cairo_matrix_t fmatrix; cairo_matrix_t ctm; cairo_scaled_font_t *new_scaled; cairo_font_options_t *fopt; if((text->flags & TXF_SCALE_DIRTY) || text->scaled_font == NULL) { fopt = cairo_font_options_create(); if(fopt == NULL) return ERR; memset(&fmatrix, 0, sizeof(cairo_matrix_t)); fmatrix.xx = text->d_font_size; fmatrix.yy = text->d_font_size; memset(&ctm, 0, sizeof(cairo_matrix_t)); ctm.xx = 1; ctm.yy = 1; new_scaled = cairo_scaled_font_create(text->face, &fmatrix, &ctm, fopt); cairo_font_options_destroy(fopt); if(new_scaled == NULL) return ERR; if(text->scaled_font) cairo_scaled_font_destroy(text->scaled_font); text->scaled_font = new_scaled; text->flags &= ~TXF_SCALE_DIRTY; } cairo_scaled_font_text_extents(text->scaled_font, text->data, extents); return OK; } void sh_text_transform(shape_t *shape) { sh_text_t *text; co_aix x, y; co_aix shw; cairo_text_extents_t extents; co_aix poses[2][2]; int r; text = (sh_text_t *)shape; text->d_font_size = coord_trans_size(shape->coord, text->font_size); x = text->x; y = text->y; coord_trans_pos(shape->coord, &x, &y); r = get_extents(text, &extents); if(r != OK) /*! \todo announce error. change return type? */ return; text->d_x = x; text->d_y = y; shw = shape->stroke_width / 2; /* FIXME: It is unreasonable that a font exceed it's bbox. * We add 5 pixels in get right bbox. But, it is unreasonable. */ poses[0][0] = x + extents.x_bearing - 5 - shw; poses[0][1] = y + extents.y_bearing - 5 - shw; poses[1][0] = poses[0][0] + extents.width + 10 + shape->stroke_width; poses[1][1] = poses[0][1] + extents.height + 10 + shape->stroke_width; geo_from_positions(shape->geo, 2, poses); } static void draw_text(sh_text_t *text, cairo_t *cr) { cairo_set_scaled_font(cr, text->scaled_font); cairo_move_to(cr, text->d_x, text->d_y); cairo_text_path(cr, text->data); } void sh_text_draw(shape_t *shape, cairo_t *cr) { draw_text((sh_text_t *)shape, cr); }