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#include "mupdf/fitz.h"
fz_text *
fz_new_text(fz_context *ctx)
{
fz_text *text = fz_malloc_struct(ctx, fz_text);
text->refs = 1;
return text;
}
fz_text *
fz_keep_text(fz_context *ctx, const fz_text *textc)
{
fz_text *text = (fz_text *)textc; /* Explicit cast away of const */
return fz_keep_imp(ctx, text, &text->refs);
}
void
fz_drop_text(fz_context *ctx, const fz_text *textc)
{
fz_text *text = (fz_text *)textc; /* Explicit cast away of const */
if (fz_drop_imp(ctx, text, &text->refs))
{
fz_text_span *span = text->head;
while (span)
{
fz_text_span *next = span->next;
fz_drop_font(ctx, span->font);
fz_free(ctx, span->items);
fz_free(ctx, span);
span = next;
}
fz_free(ctx, text);
}
}
static fz_text_span *
fz_new_text_span(fz_context *ctx, fz_font *font, int wmode, const fz_matrix *trm)
{
fz_text_span *span = fz_malloc_struct(ctx, fz_text_span);
span->font = fz_keep_font(ctx, font);
span->wmode = wmode;
span->trm = *trm;
span->trm.e = 0;
span->trm.f = 0;
return span;
}
static fz_text_span *
fz_add_text_span(fz_context *ctx, fz_text *text, fz_font *font, int wmode, const fz_matrix *trm)
{
if (!text->tail)
{
text->head = text->tail = fz_new_text_span(ctx, font, wmode, trm);
}
else if (text->tail->font != font ||
text->tail->wmode != wmode ||
text->tail->trm.a != trm->a ||
text->tail->trm.b != trm->b ||
text->tail->trm.c != trm->c ||
text->tail->trm.d != trm->d)
{
text->tail = text->tail->next = fz_new_text_span(ctx, font, wmode, trm);
}
return text->tail;
}
static void
fz_grow_text_span(fz_context *ctx, fz_text_span *span, int n)
{
int new_cap = span->cap;
if (span->len + n < new_cap)
return;
while (span->len + n > new_cap)
new_cap = new_cap + 36;
span->items = fz_resize_array(ctx, span->items, new_cap, sizeof(fz_text_item));
span->cap = new_cap;
}
void
fz_show_glyph(fz_context *ctx, fz_text *text, fz_font *font, const fz_matrix *trm, int gid, int ucs, int wmode)
{
fz_text_span *span;
if (text->refs != 1)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot modify shared text objects");
span = fz_add_text_span(ctx, text, font, wmode, trm);
fz_grow_text_span(ctx, span, 1);
span->items[span->len].ucs = ucs;
span->items[span->len].gid = gid;
span->items[span->len].x = trm->e;
span->items[span->len].y = trm->f;
span->len++;
}
void
fz_show_string(fz_context *ctx, fz_text *text, fz_font *user_font, fz_matrix *trm, const char *s, int wmode)
{
fz_font *font;
int gid, ucs;
float adv;
while (*s)
{
s += fz_chartorune(&ucs, s);
gid = fz_encode_character_with_fallback(ctx, user_font, ucs, 0, &font);
fz_show_glyph(ctx, text, font, trm, gid, ucs, wmode);
adv = fz_advance_glyph(ctx, font, gid, wmode);
if (wmode == 0)
fz_pre_translate(trm, adv, 0);
else
fz_pre_translate(trm, 0, -adv);
}
}
fz_rect *
fz_bound_text(fz_context *ctx, const fz_text *text, const fz_stroke_state *stroke, const fz_matrix *ctm, fz_rect *bbox)
{
fz_text_span *span;
fz_matrix tm, trm;
fz_rect gbox;
int i;
*bbox = fz_empty_rect;
for (span = text->head; span; span = span->next)
{
if (span->len > 0)
{
tm = span->trm;
for (i = 0; i < span->len; i++)
{
if (span->items[i].gid >= 0)
{
tm.e = span->items[i].x;
tm.f = span->items[i].y;
fz_concat(&trm, &tm, ctm);
fz_bound_glyph(ctx, span->font, span->items[i].gid, &trm, &gbox);
fz_union_rect(bbox, &gbox);
}
}
}
}
if (!fz_is_empty_rect(bbox))
{
if (stroke)
fz_adjust_rect_for_stroke(ctx, bbox, stroke, ctm);
/* Compensate for the glyph cache limited positioning precision */
bbox->x0 -= 1;
bbox->y0 -= 1;
bbox->x1 += 1;
bbox->y1 += 1;
}
return bbox;
}
fz_text *
fz_clone_text(fz_context *ctx, const fz_text *text)
{
fz_text *new_text;
fz_text_span *span;
fz_text_span **tail;
new_text = fz_malloc_struct(ctx, fz_text);
new_text->refs = 1;
span = text->head;
tail = &new_text->head;
fz_var(span);
fz_try(ctx)
{
while (span != NULL)
{
fz_text_span *new_span = fz_malloc_struct(ctx, fz_text_span);
*tail = new_span;
tail = &new_span->next;
new_text->tail = new_span;
new_span->font = fz_keep_font(ctx, span->font);
new_span->trm = span->trm;
new_span->wmode = span->wmode;
new_span->len = span->len;
new_span->cap = span->len;
new_span->items = fz_malloc(ctx, span->len * sizeof(*span->items));
memcpy(new_span->items, span->items, span->len * sizeof(*span->items));
span = span->next;
}
}
fz_catch(ctx)
{
span = new_text->head;
while (span != NULL)
{
fz_text_span *next = span->next;
fz_drop_font(ctx, span->font);
fz_free(ctx, span->items);
fz_free(ctx, span);
span = next;
}
fz_free(ctx, new_text);
fz_rethrow(ctx);
}
return new_text;
}
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