diff options
Diffstat (limited to 'src/sc_interp.c')
| -rw-r--r-- | src/sc_interp.c | 237 |
1 files changed, 235 insertions, 2 deletions
diff --git a/src/sc_interp.c b/src/sc_interp.c index 28182a9..65b113e 100644 --- a/src/sc_interp.c +++ b/src/sc_interp.c @@ -28,13 +28,246 @@ #include <assert.h> #include <stdlib.h> #include <string.h> +#include <pango/pangocairo.h> +#include <gdk/gdk.h> #include "sc_parse.h" #include "sc_interp.h" +#include "shape.h" +#include "wrap.h" struct _scinterp { - int dummy; + PangoContext *pc; + PangoLanguage *lang; + + struct slide_constants *s_constants; + struct presentation_constants *p_constants; + + struct sc_font *fontstack; + int n_fonts; + int max_fonts; }; -f
\ No newline at end of file + +static void set_font(SCInterpreter *scin, const char *font_name) +{ + PangoFontMetrics *metrics; + struct sc_font *scf; + + scf = &scin->fontstack[scin->n_fonts-1]; + + scf->fontdesc = pango_font_description_from_string(font_name); + if ( scf->fontdesc == NULL ) { + fprintf(stderr, "Couldn't describe font.\n"); + return; + } + scf->font = pango_font_map_load_font(pango_context_get_font_map(scin->pc), + scin->pc, scf->fontdesc); + if ( scf->font == NULL ) { + fprintf(stderr, "Couldn't load font.\n"); + return; + } + + /* FIXME: Language for box */ + metrics = pango_font_get_metrics(scf->font, NULL); + scf->ascent = pango_font_metrics_get_ascent(metrics); + scf->height = scf->ascent + pango_font_metrics_get_descent(metrics); + pango_font_metrics_unref(metrics); + + scf->free_font_on_pop = 1; +} + + +/* This sets the colour for the font at the top of the stack */ +static void set_colour(SCInterpreter *scin, const char *colour) +{ + GdkRGBA col; + struct sc_font *scf = &scin->fontstack[scin->n_fonts-1]; + + if ( colour == NULL ) { + printf("Invalid colour\n"); + scf->col[0] = 0.0; + scf->col[1] = 0.0; + scf->col[2] = 0.0; + scf->col[3] = 1.0; + return; + } + + gdk_rgba_parse(&col, colour); + + scf->col[0] = col.red; + scf->col[1] = col.green; + scf->col[2] = col.blue; + scf->col[3] = col.alpha; +} + + +static void copy_top_font(SCInterpreter *scin) +{ + if ( scin->n_fonts == scin->max_fonts ) { + + struct sc_font *stack_new; + + stack_new = realloc(scin->fontstack, sizeof(struct sc_font) + * ((scin->max_fonts)+8)); + if ( stack_new == NULL ) { + fprintf(stderr, "Failed to push font or colour.\n"); + return; + } + + scin->fontstack = stack_new; + scin->max_fonts += 8; + + } + + /* When n_fonts=0, we leave the first font uninitialised. This allows + * the stack to be "bootstrapped", but requires the first caller to do + * set_font and set_colour straight away. */ + if ( scin->n_fonts > 0 ) { + scin->fontstack[scin->n_fonts] = scin->fontstack[scin->n_fonts-1]; + } + + /* This is a copy, so don't free it later */ + scin->fontstack[scin->n_fonts].free_font_on_pop = 0; + + scin->n_fonts++; +} + + +static void push_font(SCInterpreter *scin, const char *font_name) +{ + copy_top_font(scin); + set_font(scin, font_name); +} + + +static void push_colour(SCInterpreter *scin, const char *colour) +{ + copy_top_font(scin); + set_colour(scin, colour); +} + + +static void pop_font_or_colour(SCInterpreter *scin) +{ + struct sc_font *scf = &scin->fontstack[scin->n_fonts-1]; + + if ( scf->free_font_on_pop ) { + pango_font_description_free(scf->fontdesc); + } + + scin->n_fonts--; +} + + +SCInterpreter *sc_interp_new() +{ + SCInterpreter *scin; + + scin = malloc(sizeof(SCInterpreter)); + if ( scin == NULL ) return NULL; + + scin->fontstack = NULL; + scin->n_fonts = 0; + scin->max_fonts = 0; + + scin->pc = NULL; + scin->s_constants = NULL; + scin->p_constants = NULL; + + /* FIXME: Determine proper language (somehow...) */ + scin->lang = pango_language_from_string("en_GB"); + + /* The "ultimate" default font */ + push_font(scin, "Sans 12"); + set_colour(scin, "#000000"); + + return scin; +} + + +void sc_interp_destroy(SCInterpreter *scin) +{ + /* Empty the stack */ + while ( scin->n_fonts > 0 ) { + pop_font_or_colour(scin); + } + + free(scin); +} + + +int sc_interp_add_blocks(SCInterpreter *scin, const SCBlock *bl) +{ + struct wrap_line *boxes; + + boxes = malloc(sizeof(struct wrap_line)); + if ( boxes == NULL ) { + fprintf(stderr, "Failed to allocate boxes.\n"); + return 1; + } + initialise_line(boxes); + + while ( bl != NULL ) { + + const char *name = sc_block_name(bl); + const char *contents = sc_block_contents(bl); + + if ( name == NULL ) { + split_words(boxes, scin->pc, contents, + scin->lang, 1, + &scin->fontstack[scin->n_fonts-1]); + +#if 0 + /* FIXME ... ! */ + + } else if ( (strcmp(name, "font")==0) && (contents == NULL) ) { + set_font(fonts, b->options, pc); + + } else if ( (strcmp(name, "font")==0) && (contents != NULL) ) { + push_font(fonts, b->options, pc); + run_sc(b->contents, fonts, pc, boxes, lang, offset, + editable, fr, slide_constants, + presentation_constants); + pop_font_or_colour(fonts); + + } else if ( (strcmp(name, "fgcol")==0) + && (contents == NULL) ) { + set_colour(fonts, b->options); + + } else if ( (strcmp(name, "fgcol")==0) && (contents != NULL) ) { + push_colour(fonts, b->options); + run_sc(b->contents, fonts, pc, boxes, lang, offset, + editable, fr, slide_constants, + presentation_constants); + pop_font_or_colour(fonts); + + } else if ( (strcmp(name, "image")==0) + && (contents != NULL) && (b->options != NULL) ) { + int w, h; + if ( get_size(b->options, fr, &w, &h) == 0 ) { + add_image_box(boxes, b->contents, offset, w, h, + editable); + } + + } else if ( strcmp(name, "slidenumber")==0) { + char *tmp = malloc(64); + if ( tmp != NULL ) { + snprintf(tmp, 63, "%i", + slide_constants->slide_number); + add_wrap_box(boxes, tmp, offset, + WRAP_SPACE_NONE, pc, + &fonts->stack[fonts->n_fonts-1], + 0); + } /* else go away and sulk about it */ +#endif + + } + + bl = sc_block_next(bl); + + } + + return 0; +} |