#include "mupdf/pdf.h" #include #include FT_FREETYPE_H #include FT_ADVANCES_H #define MATRIX_COEFS (6) #define STRIKE_HEIGHT (0.375f) #define UNDERLINE_HEIGHT (0.075f) #define LINE_THICKNESS (0.07f) #define SMALL_FLOAT (0.00001) enum { Q_Left = 0, Q_Cent = 1, Q_Right = 2 }; enum { BS_Solid, BS_Dashed, BS_Beveled, BS_Inset, BS_Underline }; typedef struct font_info_s { pdf_da_info da_rec; pdf_font_desc *font; float lineheight; } font_info; typedef struct text_widget_info_s { pdf_obj *dr; pdf_obj *col; font_info font_rec; int q; int multiline; int comb; int max_len; } text_widget_info; static const char *fmt_re = "%f %f %f %f re\n"; static const char *fmt_f = "f\n"; static const char *fmt_s = "s\n"; static const char *fmt_g = "%f g\n"; static const char *fmt_m = "%f %f m\n"; static const char *fmt_l = "%f %f l\n"; static const char *fmt_w = "%f w\n"; static const char *fmt_Tx_BMC = "/Tx BMC\n"; static const char *fmt_q = "q\n"; static const char *fmt_W = "W\n"; static const char *fmt_n = "n\n"; static const char *fmt_BT = "BT\n"; static const char *fmt_Tm = "%1.2f %1.2f %1.2f %1.2f %1.2f %1.2f Tm\n"; static const char *fmt_Td = "%f %f Td\n"; static const char *fmt_Tj = " Tj\n"; static const char *fmt_ET = "ET\n"; static const char *fmt_Q = "Q\n"; static const char *fmt_EMC = "EMC\n"; void pdf_da_info_fin(fz_context *ctx, pdf_da_info *di) { fz_free(ctx, di->font_name); di->font_name = NULL; } static void da_check_stack(float *stack, int *top) { if (*top == 32) { memmove(stack, stack + 1, 31 * sizeof(stack[0])); *top = 31; } } void pdf_parse_da(fz_context *ctx, char *da, pdf_da_info *di) { float stack[32]; int top = 0; pdf_token tok; char *name = NULL; pdf_lexbuf lbuf; fz_stream *str = fz_open_memory(ctx, (unsigned char *)da, strlen(da)); pdf_lexbuf_init(ctx, &lbuf, PDF_LEXBUF_SMALL); fz_var(str); fz_var(name); fz_try(ctx) { for (tok = pdf_lex(str, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str, &lbuf)) { switch (tok) { case PDF_TOK_NAME: fz_free(ctx, name); name = fz_strdup(ctx, lbuf.scratch); break; case PDF_TOK_INT: da_check_stack(stack, &top); stack[top] = lbuf.i; top ++; break; case PDF_TOK_REAL: da_check_stack(stack, &top); stack[top] = lbuf.f; top ++; break; case PDF_TOK_KEYWORD: if (!strcmp(lbuf.scratch, "Tf")) { di->font_size = stack[0]; di->font_name = name; name = NULL; } else if (!strcmp(lbuf.scratch, "rg")) { di->col[0] = stack[0]; di->col[1] = stack[1]; di->col[2] = stack[2]; di->col_size = 3; } else if (!strcmp(lbuf.scratch, "g")) { di->col[0] = stack[0]; di->col_size = 1; } fz_free(ctx, name); name = NULL; top = 0; break; default: break; } } } fz_always(ctx) { fz_free(ctx, name); fz_close(str); pdf_lexbuf_fin(&lbuf); } fz_catch(ctx) { fz_rethrow(ctx); } } static void get_font_info(pdf_document *doc, pdf_obj *dr, char *da, font_info *font_rec) { fz_context *ctx = doc->ctx; pdf_font_desc *font; pdf_parse_da(ctx, da, &font_rec->da_rec); if (font_rec->da_rec.font_name == NULL) fz_throw(ctx, FZ_ERROR_GENERIC, "No font name in default appearance"); font_rec->font = font = pdf_load_font(doc, dr, pdf_dict_gets(pdf_dict_gets(dr, "Font"), font_rec->da_rec.font_name), 0); font_rec->lineheight = 1.0; if (font && font->ascent != 0.0f && font->descent != 0.0f) font_rec->lineheight = (font->ascent - font->descent) / 1000.0; } static void font_info_fin(fz_context *ctx, font_info *font_rec) { pdf_drop_font(ctx, font_rec->font); font_rec->font = NULL; pdf_da_info_fin(ctx, &font_rec->da_rec); } static void get_text_widget_info(pdf_document *doc, pdf_obj *widget, text_widget_info *info) { char *da = pdf_to_str_buf(pdf_get_inheritable(doc, widget, "DA")); int ff = pdf_get_field_flags(doc, widget); pdf_obj *ml = pdf_get_inheritable(doc, widget, "MaxLen"); info->dr = pdf_get_inheritable(doc, widget, "DR"); info->col = pdf_dict_getp(widget, "MK/BG"); info->q = pdf_to_int(pdf_get_inheritable(doc, widget, "Q")); info->multiline = (ff & Ff_Multiline) != 0; info->comb = (ff & (Ff_Multiline|Ff_Password|Ff_FileSelect|Ff_Comb)) == Ff_Comb; if (ml == NULL) info->comb = 0; else info->max_len = pdf_to_int(ml); get_font_info(doc, info->dr, da, &info->font_rec); } void pdf_fzbuf_print_da(fz_context *ctx, fz_buffer *fzbuf, pdf_da_info *di) { if (di->font_name != NULL && di->font_size != 0) fz_buffer_printf(ctx, fzbuf, "/%s %d Tf", di->font_name, di->font_size); switch (di->col_size) { case 1: fz_buffer_printf(ctx, fzbuf, " %f g", di->col[0]); break; case 3: fz_buffer_printf(ctx, fzbuf, " %f %f %f rg", di->col[0], di->col[1], di->col[2]); break; case 4: fz_buffer_printf(ctx, fzbuf, " %f %f %f %f k", di->col[0], di->col[1], di->col[2], di->col[3]); break; default: fz_buffer_printf(ctx, fzbuf, " 0 g"); break; } } static fz_rect *measure_text(pdf_document *doc, font_info *font_rec, const fz_matrix *tm, char *text, fz_rect *bbox) { pdf_measure_text(doc->ctx, font_rec->font, (unsigned char *)text, strlen(text), bbox); bbox->x0 *= font_rec->da_rec.font_size * tm->a; bbox->y0 *= font_rec->da_rec.font_size * tm->d; bbox->x1 *= font_rec->da_rec.font_size * tm->a; bbox->y1 *= font_rec->da_rec.font_size * tm->d; return bbox; } static void fzbuf_print_color(fz_context *ctx, fz_buffer *fzbuf, pdf_obj *arr, int stroke, float adj) { switch (pdf_array_len(arr)) { case 1: fz_buffer_printf(ctx, fzbuf, stroke?"%f G\n":"%f g\n", pdf_to_real(pdf_array_get(arr, 0)) + adj); break; case 3: fz_buffer_printf(ctx, fzbuf, stroke?"%f %f %f RG\n":"%f %f %f rg\n", pdf_to_real(pdf_array_get(arr, 0)) + adj, pdf_to_real(pdf_array_get(arr, 1)) + adj, pdf_to_real(pdf_array_get(arr, 2)) + adj); break; case 4: fz_buffer_printf(ctx, fzbuf, stroke?"%f %f %f %f K\n":"%f %f %f %f k\n", pdf_to_real(pdf_array_get(arr, 0)), pdf_to_real(pdf_array_get(arr, 1)), pdf_to_real(pdf_array_get(arr, 2)), pdf_to_real(pdf_array_get(arr, 3))); break; } } static void fzbuf_print_text(fz_context *ctx, fz_buffer *fzbuf, const fz_rect *clip, pdf_obj *col, font_info *font_rec, const fz_matrix *tm, char *text) { fz_buffer_printf(ctx, fzbuf, fmt_q); if (clip) { fz_buffer_printf(ctx, fzbuf, fmt_re, clip->x0, clip->y0, clip->x1 - clip->x0, clip->y1 - clip->y0); fz_buffer_printf(ctx, fzbuf, fmt_W); if (col) { fzbuf_print_color(ctx, fzbuf, col, 0, 0.0); fz_buffer_printf(ctx, fzbuf, fmt_f); } else { fz_buffer_printf(ctx, fzbuf, fmt_n); } } fz_buffer_printf(ctx, fzbuf, fmt_BT); pdf_fzbuf_print_da(ctx, fzbuf, &font_rec->da_rec); fz_buffer_printf(ctx, fzbuf, "\n"); if (tm) fz_buffer_printf(ctx, fzbuf, fmt_Tm, tm->a, tm->b, tm->c, tm->d, tm->e, tm->f); fz_buffer_cat_pdf_string(ctx, fzbuf, text); fz_buffer_printf(ctx, fzbuf, fmt_Tj); fz_buffer_printf(ctx, fzbuf, fmt_ET); fz_buffer_printf(ctx, fzbuf, fmt_Q); } static fz_buffer *create_text_buffer(fz_context *ctx, const fz_rect *clip, text_widget_info *info, const fz_matrix *tm, char *text) { fz_buffer *fzbuf = fz_new_buffer(ctx, 0); fz_try(ctx) { fz_buffer_printf(ctx, fzbuf, fmt_Tx_BMC); fzbuf_print_text(ctx, fzbuf, clip, info->col, &info->font_rec, tm, text); fz_buffer_printf(ctx, fzbuf, fmt_EMC); } fz_catch(ctx) { fz_drop_buffer(ctx, fzbuf); fz_rethrow(ctx); } return fzbuf; } static fz_buffer *create_aligned_text_buffer(pdf_document *doc, const fz_rect *clip, text_widget_info *info, const fz_matrix *tm, char *text) { fz_context *ctx = doc->ctx; fz_matrix atm = *tm; if (info->q != Q_Left) { fz_rect rect; measure_text(doc, &info->font_rec, tm, text, &rect); atm.e -= info->q == Q_Right ? rect.x1 : (rect.x1 - rect.x0) / 2; } return create_text_buffer(ctx, clip, info, &atm, text); } static void measure_ascent_descent(pdf_document *doc, font_info *finf, char *text, float *ascent, float *descent) { fz_context *ctx = doc->ctx; char *testtext = NULL; fz_rect bbox; font_info tinf = *finf; fz_var(testtext); fz_try(ctx) { /* Heuristic: adding "My" to text will in most cases * produce a measurement that will encompass all chars */ testtext = fz_malloc(ctx, strlen(text) + 3); strcpy(testtext, "My"); strcat(testtext, text); tinf.da_rec.font_size = 1; measure_text(doc, &tinf, &fz_identity, testtext, &bbox); *descent = -bbox.y0; *ascent = bbox.y1; } fz_always(ctx) { fz_free(ctx, testtext); } fz_catch(ctx) { fz_rethrow(ctx); } } typedef struct text_splitter_s { font_info *info; float width; float height; float scale; float unscaled_width; float fontsize; float lineheight; char *text; int done; float x_orig; float y_orig; float x; float x_end; int text_start; int text_end; int max_lines; int retry; } text_splitter; static void text_splitter_init(text_splitter *splitter, font_info *info, char *text, float width, float height, int variable) { float fontsize = info->da_rec.font_size; memset(splitter, 0, sizeof(*splitter)); splitter->info = info; splitter->text = text; splitter->width = width; splitter->unscaled_width = width; splitter->height = height; splitter->fontsize = fontsize; splitter->scale = 1.0; splitter->lineheight = fontsize * info->lineheight ; /* RJW: The cast in the following line is important, as otherwise * under MSVC in the variable = 0 case, splitter->max_lines becomes * INT_MIN. */ splitter->max_lines = variable ? (int)(height/splitter->lineheight) : INT_MAX; } static void text_splitter_start_pass(text_splitter *splitter) { splitter->text_end = 0; splitter->x_orig = 0; splitter->y_orig = 0; } static void text_splitter_start_line(text_splitter *splitter) { splitter->x_end = 0; } static int text_splitter_layout(fz_context *ctx, text_splitter *splitter) { char *text; float room; float stride; int count; int len; float fontsize = splitter->info->da_rec.font_size; splitter->x = splitter->x_end; splitter->text_start = splitter->text_end; text = splitter->text + splitter->text_start; room = splitter->unscaled_width - splitter->x; if (strchr("\r\n", text[0])) { /* Consume return chars and report end of line */ splitter->text_end += strspn(text, "\r\n"); splitter->text_start = splitter->text_end; splitter->done = (splitter->text[splitter->text_end] == '\0'); return 0; } else if (text[0] == ' ') { /* Treat each space as a word */ len = 1; } else { len = 0; while (text[len] != '\0' && !strchr(" \r\n", text[len])) len ++; } stride = pdf_text_stride(ctx, splitter->info->font, fontsize, (unsigned char *)text, len, room, &count); /* If not a single char fits although the line is empty, then force one char */ if (count == 0 && splitter->x == 0.0) stride = pdf_text_stride(ctx, splitter->info->font, fontsize, (unsigned char *)text, 1, FLT_MAX, &count); if (count < len && splitter->retry) { /* The word didn't fit and we are in retry mode. Work out the * least additional scaling that may help */ float fitwidth; /* width if we force the word in */ float hstretchwidth; /* width if we just bump by 10% */ float vstretchwidth; /* width resulting from forcing in another line */ float bestwidth; fitwidth = splitter->x + pdf_text_stride(ctx, splitter->info->font, fontsize, (unsigned char *)text, len, FLT_MAX, &count); /* FIXME: temporary fiddle factor. Would be better to work in integers */ fitwidth *= 1.001f; /* Stretching by 10% is worth trying only if processing the first word on the line */ hstretchwidth = splitter->x == 0.0 ? splitter->width * 1.1 / splitter->scale : FLT_MAX; vstretchwidth = splitter->width * (splitter->max_lines + 1) * splitter->lineheight / splitter->height; bestwidth = fz_min(fitwidth, fz_min(hstretchwidth, vstretchwidth)); if (bestwidth == vstretchwidth) splitter->max_lines ++; splitter->scale = splitter->width / bestwidth; splitter->unscaled_width = bestwidth; splitter->retry = 0; /* Try again */ room = splitter->unscaled_width - splitter->x; stride = pdf_text_stride(ctx, splitter->info->font, fontsize, (unsigned char *)text, len, room, &count); } /* This is not the first word on the line. Best to give up on this line and push * the word onto the next */ if (count < len && splitter->x > 0.0) return 0; splitter->text_end = splitter->text_start + count; splitter->x_end = splitter->x + stride; splitter->done = (splitter->text[splitter->text_end] == '\0'); return 1; } static void text_splitter_move(text_splitter *splitter, float newy, float *relx, float *rely) { *relx = splitter->x - splitter->x_orig; *rely = newy * splitter->lineheight - splitter->y_orig; splitter->x_orig = splitter->x; splitter->y_orig = newy * splitter->lineheight; } static void text_splitter_retry(text_splitter *splitter) { if (splitter->retry) { /* Already tried expanding lines. Overflow must * be caused by carriage control */ splitter->max_lines ++; splitter->retry = 0; splitter->unscaled_width = splitter->width * splitter->max_lines * splitter->lineheight / splitter->height; splitter->scale = splitter->width / splitter->unscaled_width; } else { splitter->retry = 1; } } static void fzbuf_print_text_start(fz_context *ctx, fz_buffer *fzbuf, const fz_rect *clip, pdf_obj *col, font_info *font, const fz_matrix *tm) { fz_buffer_printf(ctx, fzbuf, fmt_Tx_BMC); fz_buffer_printf(ctx, fzbuf, fmt_q); if (clip) { fz_buffer_printf(ctx, fzbuf, fmt_re, clip->x0, clip->y0, clip->x1 - clip->x0, clip->y1 - clip->y0); fz_buffer_printf(ctx, fzbuf, fmt_W); if (col) { fzbuf_print_color(ctx, fzbuf, col, 0, 0.0); fz_buffer_printf(ctx, fzbuf, fmt_f); } else { fz_buffer_printf(ctx, fzbuf, fmt_n); } } fz_buffer_printf(ctx, fzbuf, fmt_BT); pdf_fzbuf_print_da(ctx, fzbuf, &font->da_rec); fz_buffer_printf(ctx, fzbuf, "\n"); fz_buffer_printf(ctx, fzbuf, fmt_Tm, tm->a, tm->b, tm->c, tm->d, tm->e, tm->f); } static void fzbuf_print_text_end(fz_context *ctx, fz_buffer *fzbuf) { fz_buffer_printf(ctx, fzbuf, fmt_ET); fz_buffer_printf(ctx, fzbuf, fmt_Q); fz_buffer_printf(ctx, fzbuf, fmt_EMC); } static void fzbuf_print_text_word(fz_context *ctx, fz_buffer *fzbuf, float x, float y, char *text, int count) { int i; fz_buffer_printf(ctx, fzbuf, fmt_Td, x, y); fz_buffer_printf(ctx, fzbuf, "("); for (i = 0; i < count; i++) fz_buffer_printf(ctx, fzbuf, "%c", text[i]); fz_buffer_printf(ctx, fzbuf, ") Tj\n"); } static fz_buffer *create_text_appearance(pdf_document *doc, const fz_rect *bbox, const fz_matrix *oldtm, text_widget_info *info, char *text) { fz_context *ctx = doc->ctx; int fontsize; int variable; float height, width, full_width; fz_buffer *fzbuf = NULL; fz_buffer *fztmp = NULL; fz_rect rect; fz_rect tbox; rect = *bbox; if (rect.x1 - rect.x0 > 3.0 && rect.y1 - rect.y0 > 3.0) { rect.x0 += 1.0; rect.x1 -= 1.0; rect.y0 += 1.0; rect.y1 -= 1.0; } height = rect.y1 - rect.y0; width = rect.x1 - rect.x0; full_width = bbox->x1 - bbox->x0; fz_var(fzbuf); fz_var(fztmp); fz_try(ctx) { float ascent, descent; fz_matrix tm; variable = (info->font_rec.da_rec.font_size == 0); fontsize = variable ? (info->multiline ? 14.0 : height / info->font_rec.lineheight) : info->font_rec.da_rec.font_size; info->font_rec.da_rec.font_size = fontsize; measure_ascent_descent(doc, &info->font_rec, text, &ascent, &descent); if (info->multiline) { text_splitter splitter; text_splitter_init(&splitter, &info->font_rec, text, width, height, variable); while (!splitter.done) { /* Try a layout pass */ int line = 0; fz_drop_buffer(ctx, fztmp); fztmp = NULL; fztmp = fz_new_buffer(ctx, 0); text_splitter_start_pass(&splitter); /* Layout unscaled text to a scaled-up width, so that * the scaled-down text will fit the unscaled width */ while (!splitter.done && line < splitter.max_lines) { /* Layout a line */ text_splitter_start_line(&splitter); while (!splitter.done && text_splitter_layout(ctx, &splitter)) { if (splitter.text[splitter.text_start] != ' ') { float x, y; char *word = text+splitter.text_start; int wordlen = splitter.text_end-splitter.text_start; text_splitter_move(&splitter, -line, &x, &y); fzbuf_print_text_word(ctx, fztmp, x, y, word, wordlen); } } line ++; } if (!splitter.done) text_splitter_retry(&splitter); } fzbuf = fz_new_buffer(ctx, 0); tm.a = splitter.scale; tm.b = 0.0; tm.c = 0.0; tm.d = splitter.scale; tm.e = rect.x0; tm.f = rect.y1 - (1.0+ascent-descent)*fontsize*splitter.scale/2.0; fzbuf_print_text_start(ctx, fzbuf, &rect, info->col, &info->font_rec, &tm); fz_buffer_cat(ctx, fzbuf, fztmp); fzbuf_print_text_end(ctx, fzbuf); } else if (info->comb) { int i, n = fz_mini((int)strlen(text), info->max_len); float comb_width = full_width/info->max_len; float char_width = pdf_text_stride(ctx, info->font_rec.font, fontsize, (unsigned char *)"M", 1, FLT_MAX, NULL); float init_skip = (comb_width - char_width)/2.0; fz_translate(&tm, rect.x0, rect.y1 - (height+(ascent-descent)*fontsize)/2.0); fzbuf = fz_new_buffer(ctx, 0); fzbuf_print_text_start(ctx, fzbuf, &rect, info->col, &info->font_rec, &tm); for (i = 0; i < n; i++) fzbuf_print_text_word(ctx, fzbuf, i == 0 ? init_skip : comb_width, 0.0, text+i, 1); fzbuf_print_text_end(ctx, fzbuf); } else { if (oldtm) { tm = *oldtm; } else { fz_translate(&tm, rect.x0, rect.y1 - (height+(ascent-descent)*fontsize)/2.0); switch (info->q) { case Q_Right: tm.e += width; break; case Q_Cent: tm.e += width/2; break; } } if (variable) { measure_text(doc, &info->font_rec, &tm, text, &tbox); if (tbox.x1 - tbox.x0 > width) { /* Scale the text to fit but use the same offset * to keep the baseline constant */ tm.a *= width / (tbox.x1 - tbox.x0); tm.d *= width / (tbox.x1 - tbox.x0); } } fzbuf = create_aligned_text_buffer(doc, &rect, info, &tm, text); } } fz_always(ctx) { fz_drop_buffer(ctx, fztmp); } fz_catch(ctx) { fz_drop_buffer(ctx, fzbuf); fz_rethrow(ctx); } return fzbuf; } static int get_matrix(pdf_document *doc, pdf_xobject *form, int q, fz_matrix *mt) { fz_context *ctx = doc->ctx; int found = 0; pdf_lexbuf lbuf; fz_stream *str; str = pdf_open_stream(doc, pdf_to_num(form->contents), pdf_to_gen(form->contents)); pdf_lexbuf_init(ctx, &lbuf, PDF_LEXBUF_SMALL); fz_try(ctx) { int tok; float coefs[MATRIX_COEFS]; int coef_i = 0; /* Look for the text matrix Tm in the stream */ for (tok = pdf_lex(str, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str, &lbuf)) { if (tok == PDF_TOK_INT || tok == PDF_TOK_REAL) { if (coef_i >= MATRIX_COEFS) { int i; for (i = 0; i < MATRIX_COEFS-1; i++) coefs[i] = coefs[i+1]; coef_i = MATRIX_COEFS-1; } coefs[coef_i++] = tok == PDF_TOK_INT ? lbuf.i : lbuf.f; } else { if (tok == PDF_TOK_KEYWORD && !strcmp(lbuf.scratch, "Tm") && coef_i == MATRIX_COEFS) { found = 1; mt->a = coefs[0]; mt->b = coefs[1]; mt->c = coefs[2]; mt->d = coefs[3]; mt->e = coefs[4]; mt->f = coefs[5]; } coef_i = 0; } } if (found) { fz_rect bbox; pdf_to_rect(ctx, pdf_dict_gets(form->contents, "BBox"), &bbox); switch (q) { case Q_Left: mt->e = bbox.x0 + 1; break; case Q_Cent: mt->e = (bbox.x1 - bbox.x0) / 2; break; case Q_Right: mt->e = bbox.x1 - 1; break; } } } fz_always(ctx) { fz_close(str); pdf_lexbuf_fin(&lbuf); } fz_catch(ctx) { fz_rethrow(ctx); } return found; } static char *to_font_encoding(fz_context *ctx, pdf_font_desc *font, char *utf8) { int i; int needs_converting = 0; /* Temporay partial solution. We are using a slow lookup in the conversion * below, so we avoid performing the conversion unnecessarily. We check for * top-bit-set chars, and convert only if they are present. We should also * check that the font encoding is one that agrees with utf8 from 0 to 7f, * but for now we get away without doing so. This is after all an improvement * on just strdup */ for (i = 0; utf8[i] != '\0'; i++) { if (utf8[i] & 0x80) needs_converting = 1; } /* Even if we need to convert, we cannot do so if the font has no cid_to_ucs mapping */ if (needs_converting && font->cid_to_ucs) { char *buf = fz_malloc(ctx, strlen(utf8) + 1); char *bufp = buf; fz_try(ctx) { while(*utf8) { if (*utf8 & 0x80) { int rune; utf8 += fz_chartorune(&rune, utf8); /* Slow search for the cid that maps to the unicode value held in 'rune" */ for (i = 0; i < font->cid_to_ucs_len && font->cid_to_ucs[i] != rune; i++) ; /* If found store the cid */ if (i < font->cid_to_ucs_len) *bufp++ = i; } else { *bufp++ = *utf8++; } } *bufp = '\0'; } fz_catch(ctx) { fz_free(ctx, buf); fz_rethrow(ctx); } return buf; } else { /* If either no conversion is needed or the font has no cid_to_ucs * mapping then leave unconverted, although in the latter case the result * is likely incorrect */ return fz_strdup(ctx, utf8); } } static void account_for_rot(fz_rect *rect, fz_matrix *mat, int rot) { float width = rect->x1; float height = rect->y1; switch (rot) { default: *mat = fz_identity; break; case 90: fz_pre_rotate(fz_translate(mat, width, 0), rot); rect->x1 = height; rect->y1 = width; break; case 180: fz_pre_rotate(fz_translate(mat, width, height), rot); break; case 270: fz_pre_rotate(fz_translate(mat, 0, height), rot); rect->x1 = height; rect->y1 = width; break; } } static void copy_resources(pdf_obj *dst, pdf_obj *src) { int i, len; len = pdf_dict_len(src); for (i = 0; i < len; i++) { pdf_obj *key = pdf_dict_get_key(src, i); if (!pdf_dict_get(dst, key)) pdf_dict_put(dst, key, pdf_dict_get_val(src, i)); } } static pdf_xobject *load_or_create_form(pdf_document *doc, pdf_obj *obj, fz_rect *rect) { fz_context *ctx = doc->ctx; pdf_obj *ap = NULL; fz_matrix mat; int rot; pdf_obj *formobj = NULL; pdf_xobject *form = NULL; char *dn = "N"; fz_buffer *fzbuf = NULL; int create_form = 0; fz_var(formobj); fz_var(form); fz_var(fzbuf); fz_try(ctx) { rot = pdf_to_int(pdf_dict_getp(obj, "MK/R")); pdf_to_rect(ctx, pdf_dict_gets(obj, "Rect"), rect); rect->x1 -= rect->x0; rect->y1 -= rect->y0; rect->x0 = rect->y0 = 0; account_for_rot(rect, &mat, rot); ap = pdf_dict_gets(obj, "AP"); if (ap == NULL) { ap = pdf_new_dict(doc, 1); pdf_dict_puts_drop(obj, "AP", ap); } formobj = pdf_dict_gets(ap, dn); if (formobj == NULL) { formobj = pdf_new_xobject(doc, rect, &mat); pdf_dict_puts_drop(ap, dn, formobj); create_form = 1; } form = pdf_load_xobject(doc, formobj); if (create_form) { fzbuf = fz_new_buffer(ctx, 1); pdf_update_xobject_contents(doc, form, fzbuf); } copy_resources(form->resources, pdf_get_inheritable(doc, obj, "DR")); } fz_always(ctx) { fz_drop_buffer(ctx, fzbuf); } fz_catch(ctx) { pdf_drop_xobject(ctx, form); fz_rethrow(ctx); } return form; } static void update_marked_content(pdf_document *doc, pdf_xobject *form, fz_buffer *fzbuf) { fz_context *ctx = doc->ctx; pdf_token tok; pdf_lexbuf lbuf; fz_stream *str_outer = NULL; fz_stream *str_inner = NULL; unsigned char *buf; int len; fz_buffer *newbuf = NULL; pdf_lexbuf_init(ctx, &lbuf, PDF_LEXBUF_SMALL); fz_var(str_outer); fz_var(str_inner); fz_var(newbuf); fz_try(ctx) { int bmc_found; int first = 1; newbuf = fz_new_buffer(ctx, 0); str_outer = pdf_open_stream(doc, pdf_to_num(form->contents), pdf_to_gen(form->contents)); len = fz_buffer_storage(ctx, fzbuf, &buf); str_inner = fz_open_memory(ctx, buf, len); /* Copy the existing appearance stream to newbuf while looking for BMC */ for (tok = pdf_lex(str_outer, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str_outer, &lbuf)) { if (first) first = 0; else fz_buffer_printf(ctx, newbuf, " "); pdf_print_token(ctx, newbuf, tok, &lbuf); if (tok == PDF_TOK_KEYWORD && !strcmp(lbuf.scratch, "BMC")) break; } bmc_found = (tok != PDF_TOK_EOF); if (bmc_found) { /* Drop Tx BMC from the replacement appearance stream */ (void)pdf_lex(str_inner, &lbuf); (void)pdf_lex(str_inner, &lbuf); } /* Copy the replacement appearance stream to newbuf */ for (tok = pdf_lex(str_inner, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str_inner, &lbuf)) { fz_buffer_printf(ctx, newbuf, " "); pdf_print_token(ctx, newbuf, tok, &lbuf); } if (bmc_found) { /* Drop the rest of the existing appearance stream until EMC found */ for (tok = pdf_lex(str_outer, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str_outer, &lbuf)) { if (tok == PDF_TOK_KEYWORD && !strcmp(lbuf.scratch, "EMC")) break; } /* Copy the rest of the existing appearance stream to newbuf */ for (tok = pdf_lex(str_outer, &lbuf); tok != PDF_TOK_EOF; tok = pdf_lex(str_outer, &lbuf)) { fz_buffer_printf(ctx, newbuf, " "); pdf_print_token(ctx, newbuf, tok, &lbuf); } } /* Use newbuf in place of the existing appearance stream */ pdf_update_xobject_contents(doc, form, newbuf); } fz_always(ctx) { fz_close(str_outer); fz_close(str_inner); fz_drop_buffer(ctx, newbuf); pdf_lexbuf_fin(&lbuf); } fz_catch(ctx) { fz_rethrow(ctx); } } static int get_border_style(pdf_obj *obj) { char *sname = pdf_to_name(pdf_dict_getp(obj, "BS/S")); if (!strcmp(sname, "D")) return BS_Dashed; else if (!strcmp(sname, "B")) return BS_Beveled; else if (!strcmp(sname, "I")) return BS_Inset; else if (!strcmp(sname, "U")) return BS_Underline; else return BS_Solid; } static float get_border_width(pdf_obj *obj) { float w = pdf_to_real(pdf_dict_getp(obj, "BS/W")); return w == 0.0 ? 1.0 : w; } void pdf_update_text_appearance(pdf_document *doc, pdf_obj *obj, char *eventValue) { fz_context *ctx = doc->ctx; text_widget_info info; pdf_xobject *form = NULL; fz_buffer *fzbuf = NULL; fz_matrix tm; fz_rect rect; int has_tm; char *text = NULL; memset(&info, 0, sizeof(info)); fz_var(info); fz_var(form); fz_var(fzbuf); fz_var(text); fz_try(ctx) { get_text_widget_info(doc, obj, &info); if (eventValue) text = to_font_encoding(ctx, info.font_rec.font, eventValue); else text = pdf_field_value(doc, obj); form = load_or_create_form(doc, obj, &rect); has_tm = get_matrix(doc, form, info.q, &tm); fzbuf = create_text_appearance(doc, &form->bbox, has_tm ? &tm : NULL, &info, text?text:""); update_marked_content(doc, form, fzbuf); } fz_always(ctx) { fz_free(ctx, text); pdf_drop_xobject(ctx, form); fz_drop_buffer(ctx, fzbuf); font_info_fin(ctx, &info.font_rec); } fz_catch(ctx) { fz_warn(ctx, "update_text_appearance failed"); } } void pdf_update_combobox_appearance(pdf_document *doc, pdf_obj *obj) { fz_context *ctx = doc->ctx; text_widget_info info; pdf_xobject *form = NULL; fz_buffer *fzbuf = NULL; fz_matrix tm; fz_rect rect; int has_tm; pdf_obj *val; char *text; memset(&info, 0, sizeof(info)); fz_var(info); fz_var(form); fz_var(fzbuf); fz_try(ctx) { get_text_widget_info(doc, obj, &info); val = pdf_get_inheritable(doc, obj, "V"); if (pdf_is_array(val)) val = pdf_array_get(val, 0); text = pdf_to_str_buf(val); if (!text) text = ""; form = load_or_create_form(doc, obj, &rect); has_tm = get_matrix(doc, form, info.q, &tm); fzbuf = create_text_appearance(doc, &form->bbox, has_tm ? &tm : NULL, &info, text?text:""); update_marked_content(doc, form, fzbuf); } fz_always(ctx) { pdf_drop_xobject(ctx, form); fz_drop_buffer(ctx, fzbuf); font_info_fin(ctx, &info.font_rec); } fz_catch(ctx) { fz_warn(ctx, "update_text_appearance failed"); } } void pdf_update_pushbutton_appearance(pdf_document *doc, pdf_obj *obj) { fz_context *ctx = doc->ctx; fz_rect rect; pdf_xobject *form = NULL; fz_buffer *fzbuf = NULL; pdf_obj *tobj = NULL; font_info font_rec; int bstyle; float bwidth; float btotal; memset(&font_rec, 0, sizeof(font_rec)); fz_var(font_rec); fz_var(form); fz_var(fzbuf); fz_try(ctx) { form = load_or_create_form(doc, obj, &rect); fzbuf = fz_new_buffer(ctx, 0); tobj = pdf_dict_getp(obj, "MK/BG"); if (pdf_is_array(tobj)) { fzbuf_print_color(ctx, fzbuf, tobj, 0, 0.0); fz_buffer_printf(ctx, fzbuf, fmt_re, rect.x0, rect.y0, rect.x1, rect.y1); fz_buffer_printf(ctx, fzbuf, fmt_f); } bstyle = get_border_style(obj); bwidth = get_border_width(obj); btotal = bwidth; if (bstyle == BS_Beveled || bstyle == BS_Inset) { btotal += bwidth; if (bstyle == BS_Beveled) fz_buffer_printf(ctx, fzbuf, fmt_g, 1.0); else fz_buffer_printf(ctx, fzbuf, fmt_g, 0.33); fz_buffer_printf(ctx, fzbuf, fmt_m, bwidth, bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, bwidth, rect.y1 - bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, rect.x1 - bwidth, rect.y1 - bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, rect.x1 - 2 * bwidth, rect.y1 - 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, 2 * bwidth, rect.y1 - 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, 2 * bwidth, 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_f); if (bstyle == BS_Beveled) fzbuf_print_color(ctx, fzbuf, tobj, 0, -0.25); else fz_buffer_printf(ctx, fzbuf, fmt_g, 0.66); fz_buffer_printf(ctx, fzbuf, fmt_m, rect.x1 - bwidth, rect.y1 - bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, rect.x1 - bwidth, bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, bwidth, bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, 2 * bwidth, 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, rect.x1 - 2 * bwidth, 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_l, rect.x1 - 2 * bwidth, rect.y1 - 2 * bwidth); fz_buffer_printf(ctx, fzbuf, fmt_f); } tobj = pdf_dict_getp(obj, "MK/BC"); if (tobj) { fzbuf_print_color(ctx, fzbuf, tobj, 1, 0.0); fz_buffer_printf(ctx, fzbuf, fmt_w, bwidth); fz_buffer_printf(ctx, fzbuf, fmt_re, bwidth/2, bwidth/2, rect.x1 -bwidth/2, rect.y1 - bwidth/2); fz_buffer_printf(ctx, fzbuf, fmt_s); } tobj = pdf_dict_getp(obj, "MK/CA"); if (tobj) { fz_rect clip = rect; fz_rect bounds; fz_matrix mat; char *da = pdf_to_str_buf(pdf_get_inheritable(doc, obj, "DA")); char *text = pdf_to_str_buf(tobj); clip.x0 += btotal; clip.y0 += btotal; clip.x1 -= btotal; clip.y1 -= btotal; get_font_info(doc, form->resources, da, &font_rec); measure_text(doc, &font_rec, &fz_identity, text, &bounds); fz_translate(&mat, (rect.x1 - bounds.x1)/2, (rect.y1 - bounds.y1)/2); fzbuf_print_text(ctx, fzbuf, &clip, NULL, &font_rec, &mat, text); } pdf_update_xobject_contents(doc, form, fzbuf); } fz_always(ctx) { font_info_fin(ctx, &font_rec); fz_drop_buffer(ctx, fzbuf); pdf_drop_xobject(ctx, form); } fz_catch(ctx) { fz_rethrow(ctx); } } void pdf_update_text_markup_appearance(pdf_document *doc, pdf_annot *annot, fz_annot_type type) { float color[3]; float alpha; float line_height; float line_thickness; switch (type) { case FZ_ANNOT_HIGHLIGHT: color[0] = 1.0; color[1] = 1.0; color[2] = 0.0; alpha = 0.5; line_thickness = 1.0; line_height = 0.5; break; case FZ_ANNOT_UNDERLINE: color[0] = 0.0; color[1] = 0.0; color[2] = 1.0; alpha = 1.0; line_thickness = LINE_THICKNESS; line_height = UNDERLINE_HEIGHT; break; case FZ_ANNOT_STRIKEOUT: color[0] = 1.0; color[1] = 0.0; color[2] = 0.0; alpha = 1.0; line_thickness = LINE_THICKNESS; line_height = STRIKE_HEIGHT; break; default: return; } pdf_set_markup_appearance(doc, annot, color, alpha, line_thickness, line_height); } static void update_rect(fz_context *ctx, pdf_annot *annot) { pdf_to_rect(ctx, pdf_dict_gets(annot->obj, "Rect"), &annot->rect); annot->pagerect = annot->rect; fz_transform_rect(&annot->pagerect, &annot->page->ctm); } void pdf_set_annot_appearance(pdf_document *doc, pdf_annot *annot, fz_rect *rect, fz_display_list *disp_list) { fz_context *ctx = doc->ctx; pdf_obj *obj = annot->obj; const fz_matrix *page_ctm = &annot->page->ctm; fz_matrix ctm; fz_matrix mat = fz_identity; fz_device *dev = NULL; pdf_xobject *xobj = NULL; fz_invert_matrix(&ctm, page_ctm); fz_var(dev); fz_try(ctx) { pdf_obj *ap_obj; fz_rect trect = *rect; fz_transform_rect(&trect, &ctm); pdf_dict_puts_drop(obj, "Rect", pdf_new_rect(doc, &trect)); /* See if there is a current normal appearance */ ap_obj = pdf_dict_getp(obj, "AP/N"); if (!pdf_is_stream(doc, pdf_to_num(ap_obj), pdf_to_gen(ap_obj))) ap_obj = NULL; if (ap_obj == NULL) { ap_obj = pdf_new_xobject(doc, &trect, &mat); pdf_dict_putp_drop(obj, "AP/N", ap_obj); } else { pdf_xref_ensure_incremental_object(doc, pdf_to_num(ap_obj)); /* Update bounding box and matrix in reused xobject obj */ pdf_dict_puts_drop(ap_obj, "BBox", pdf_new_rect(doc, &trect)); pdf_dict_puts_drop(ap_obj, "Matrix", pdf_new_matrix(doc, &mat)); } dev = pdf_new_pdf_device(doc, ap_obj, pdf_dict_gets(ap_obj, "Resources"), &mat); fz_run_display_list(disp_list, dev, &ctm, &fz_infinite_rect, NULL); fz_free_device(dev); /* Mark the appearance as changed - required for partial update */ xobj = pdf_load_xobject(doc, ap_obj); if (xobj) { /* Update bounding box and matrix also in the xobject structure */ xobj->bbox = trect; xobj->matrix = mat; xobj->iteration++; pdf_drop_xobject(ctx, xobj); } doc->dirty = 1; update_rect(ctx, annot); } fz_catch(ctx) { fz_free_device(dev); fz_rethrow(ctx); } } static fz_point * quadpoints(pdf_document *doc, pdf_obj *annot, int *nout) { fz_context *ctx = doc->ctx; pdf_obj *quad = pdf_dict_gets(annot, "QuadPoints"); fz_point *qp = NULL; int i, n; if (!quad) return NULL; n = pdf_array_len(quad); if (n%8 != 0) return NULL; fz_var(qp); fz_try(ctx) { qp = fz_malloc_array(ctx, n/2, sizeof(fz_point)); for (i = 0; i < n; i += 2) { qp[i/2].x = pdf_to_real(pdf_array_get(quad, i)); qp[i/2].y = pdf_to_real(pdf_array_get(quad, i+1)); } } fz_catch(ctx) { fz_free(ctx, qp); fz_rethrow(ctx); } *nout = n/2; return qp; } void pdf_set_markup_appearance(pdf_document *doc, pdf_annot *annot, float color[3], float alpha, float line_thickness, float line_height) { fz_context *ctx = doc->ctx; const fz_matrix *page_ctm = &annot->page->ctm; fz_path *path = NULL; fz_stroke_state *stroke = NULL; fz_device *dev = NULL; fz_display_list *strike_list = NULL; int i, n; fz_point *qp = quadpoints(doc, annot->obj, &n); if (!qp || n <= 0) return; fz_var(path); fz_var(stroke); fz_var(dev); fz_var(strike_list); fz_try(ctx) { fz_rect rect = fz_empty_rect; rect.x0 = rect.x1 = qp[0].x; rect.y0 = rect.y1 = qp[0].y; for (i = 0; i < n; i++) fz_include_point_in_rect(&rect, &qp[i]); strike_list = fz_new_display_list(ctx); dev = fz_new_list_device(ctx, strike_list); for (i = 0; i < n; i += 4) { fz_point pt0 = qp[i]; fz_point pt1 = qp[i+1]; fz_point up; float thickness; up.x = qp[i+2].x - qp[i+1].x; up.y = qp[i+2].y - qp[i+1].y; pt0.x += line_height * up.x; pt0.y += line_height * up.y; pt1.x += line_height * up.x; pt1.y += line_height * up.y; thickness = sqrtf(up.x * up.x + up.y * up.y) * line_thickness; if (!stroke || fz_abs(stroke->linewidth - thickness) < SMALL_FLOAT) { if (stroke) { // assert(path) fz_stroke_path(dev, path, stroke, page_ctm, fz_device_rgb(ctx), color, alpha); fz_drop_stroke_state(ctx, stroke); stroke = NULL; fz_free_path(ctx, path); path = NULL; } stroke = fz_new_stroke_state(ctx); stroke->linewidth = thickness; path = fz_new_path(ctx); } fz_moveto(ctx, path, pt0.x, pt0.y); fz_lineto(ctx, path, pt1.x, pt1.y); } if (stroke) { fz_stroke_path(dev, path, stroke, page_ctm, fz_device_rgb(ctx), color, alpha); } fz_transform_rect(&rect, page_ctm); pdf_set_annot_appearance(doc, annot, &rect, strike_list); } fz_always(ctx) { fz_free(ctx, qp); fz_free_device(dev); fz_drop_stroke_state(ctx, stroke); fz_free_path(ctx, path); fz_drop_display_list(ctx, strike_list); } fz_catch(ctx) { fz_rethrow(ctx); } } static fz_colorspace *pdf_to_color(pdf_document *doc, pdf_obj *col, float color[4]) { fz_colorspace *cs; int i, ncol = pdf_array_len(col); switch (ncol) { case 1: cs = fz_device_gray(doc->ctx); break; case 3: cs = fz_device_rgb(doc->ctx); break; case 4: cs = fz_device_cmyk(doc->ctx); break; default: return NULL; } for (i = 0; i < ncol; i++) color[i] = pdf_to_real(pdf_array_get(col, i)); return cs; } void pdf_update_ink_appearance(pdf_document *doc, pdf_annot *annot) { fz_context *ctx = doc->ctx; const fz_matrix *page_ctm = &annot->page->ctm; fz_path *path = NULL; fz_stroke_state *stroke = NULL; fz_device *dev = NULL; fz_display_list *strike_list = NULL; fz_colorspace *cs = NULL; fz_var(path); fz_var(stroke); fz_var(dev); fz_var(strike_list); fz_var(cs); fz_try(ctx) { fz_rect rect = fz_empty_rect; float color[4]; float width; pdf_obj *list; int n, m, i, j; cs = pdf_to_color(doc, pdf_dict_gets(annot->obj, "C"), color); if (!cs) { cs = fz_device_rgb(ctx); color[0] = 1.0f; color[1] = 0.0f; color[2] = 0.0f; } width = pdf_to_real(pdf_dict_gets(pdf_dict_gets(annot->obj, "BS"), "W")); if (width == 0.0f) width = 1.0f; list = pdf_dict_gets(annot->obj, "InkList"); n = pdf_array_len(list); strike_list = fz_new_display_list(ctx); dev = fz_new_list_device(ctx, strike_list); path = fz_new_path(ctx); stroke = fz_new_stroke_state(ctx); stroke->linewidth = width; for (i = 0; i < n; i ++) { fz_point pt_last; pdf_obj *arc = pdf_array_get(list, i); m = pdf_array_len(arc); for (j = 0; j < m-1; j += 2) { fz_point pt; pt.x = pdf_to_real(pdf_array_get(arc, j)); pt.y = pdf_to_real(pdf_array_get(arc, j+1)); if (i == 0 && j == 0) { rect.x0 = rect.x1 = pt.x; rect.y0 = rect.y1 = pt.y; } else { fz_include_point_in_rect(&rect, &pt); } if (j == 0) fz_moveto(ctx, path, pt.x, pt.y); else fz_curvetov(ctx, path, pt_last.x, pt_last.y, (pt.x + pt_last.x) / 2, (pt.y + pt_last.y) / 2); pt_last = pt; } fz_lineto(ctx, path, pt_last.x, pt_last.y); } fz_stroke_path(dev, path, stroke, page_ctm, cs, color, 1.0f); fz_expand_rect(&rect, width); fz_transform_rect(&rect, page_ctm); pdf_set_annot_appearance(doc, annot, &rect, strike_list); } fz_always(ctx) { fz_drop_colorspace(ctx, cs); fz_free_device(dev); fz_drop_stroke_state(ctx, stroke); fz_free_path(ctx, path); fz_drop_display_list(ctx, strike_list); } fz_catch(ctx) { fz_rethrow(ctx); } } static void add_text(fz_context *ctx, font_info *font_rec, fz_text *text, char *str, int str_len, float x, float y) { fz_font *font = font_rec->font->font; int mask = FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM; while (str_len--) { FT_Fixed adv; /* FIXME: convert str from utf8 to WinAnsi */ int gid = FT_Get_Char_Index(font->ft_face, *str); fz_add_text(ctx, text, gid, *str++, x, y); FT_Get_Advance(font->ft_face, gid, mask, &adv); x += ((float)adv) * font_rec->da_rec.font_size / ((FT_Face)font->ft_face)->units_per_EM; } } static fz_text *layout_text(fz_context *ctx, font_info *font_rec, char *str, float x, float y) { fz_matrix tm; fz_font *font = font_rec->font->font; fz_text *text; int mask = FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM; fz_scale(&tm, font_rec->da_rec.font_size, font_rec->da_rec.font_size); text = fz_new_text(ctx, font, &tm, 0); fz_try(ctx) { add_text(ctx, font_rec, text, str, strlen(str), x, y); } fz_catch(ctx) { fz_free_text(ctx, text); fz_rethrow(ctx); } return text; } static fz_text *fit_text(fz_context *ctx, font_info *font_rec, char *str, fz_rect *bounds) { float width = bounds->x1 - bounds->x0; float height = bounds->y1 - bounds->y0; fz_matrix tm; fz_text *text = NULL; text_splitter splitter; float ascender; /* Initially aim for one-line of text */ font_rec->da_rec.font_size = height / font_rec->lineheight; text_splitter_init(&splitter, font_rec, str, width, height, 1); fz_var(text); fz_try(ctx) { int i; while (!splitter.done) { /* Try a layout pass */ int line = 0; float font_size; float x = 0.0; float y = 0.0; fz_free_text(ctx, text); text = NULL; font_size = font_rec->da_rec.font_size; fz_scale(&tm, font_size, font_size); text = fz_new_text(ctx, font_rec->font->font, &tm, 0); text_splitter_start_pass(&splitter); /* Layout unscaled text to a scaled-up width, so that * the scaled-down text will fit the unscaled width */ while (!splitter.done && line < splitter.max_lines) { /* Layout a line */ text_splitter_start_line(&splitter); while (!splitter.done && text_splitter_layout(ctx, &splitter)) { if (splitter.text[splitter.text_start] != ' ') { float dx, dy; char *word = str+splitter.text_start; int wordlen = splitter.text_end-splitter.text_start; text_splitter_move(&splitter, -line, &dx, &dy); x += dx; y += dy; add_text(ctx, font_rec, text, word, wordlen, x, y); } } line ++; } if (!splitter.done) text_splitter_retry(&splitter); } /* Post process text with the scale determined by the splitter * and with the required offst */ fz_pre_scale(&text->trm, splitter.scale, splitter.scale); ascender = font_rec->font->ascent * font_rec->da_rec.font_size * splitter.scale / 1000.0f; for (i = 0; i < text->len; i++) { text->items[i].x = text->items[i].x * splitter.scale + bounds->x0; text->items[i].y = text->items[i].y * splitter.scale + bounds->y1 - ascender; } } fz_catch(ctx) { fz_free_text(ctx, text); fz_rethrow(ctx); } return text; } void pdf_update_free_text_annot_appearance(pdf_document *doc, pdf_annot *annot) { fz_context *ctx = doc->ctx; const fz_matrix *page_ctm = &annot->page->ctm; pdf_obj *obj = annot->obj; pdf_obj *dr = pdf_dict_getp(annot->page->me, "Resources"); fz_display_list *dlist = NULL; fz_device *dev = NULL; font_info font_rec; fz_text *text = NULL; fz_colorspace *cs = NULL; memset(&font_rec, 0, sizeof(font_rec)); fz_var(dlist); fz_var(dev); fz_var(text); fz_var(cs); fz_try(ctx) { char *contents = pdf_to_str_buf(pdf_dict_gets(obj, "Contents")); char *da = pdf_to_str_buf(pdf_dict_gets(obj, "DA")); fz_rect rect = annot->rect; fz_point pos; get_font_info(doc, dr, da, &font_rec); switch (font_rec.da_rec.col_size) { case 1: cs = fz_device_gray(doc->ctx); break; case 3: cs = fz_device_rgb(doc->ctx); break; case 4: cs = fz_device_cmyk(doc->ctx); break; } /* Adjust for the descender */ pos.x = rect.x0; pos.y = rect.y0 - font_rec.font->descent * font_rec.da_rec.font_size / 1000.0f; text = layout_text(ctx, &font_rec, contents, pos.x, pos.y); dlist = fz_new_display_list(ctx); dev = fz_new_list_device(ctx, dlist); fz_fill_text(dev, text, page_ctm, cs, font_rec.da_rec.col, 1.0f); fz_transform_rect(&rect, page_ctm); pdf_set_annot_appearance(doc, annot, &rect, dlist); } fz_always(ctx) { fz_free_device(dev); fz_drop_display_list(ctx, dlist); font_info_fin(ctx, &font_rec); fz_free_text(ctx, text); fz_drop_colorspace(ctx, cs); } fz_catch(ctx) { fz_rethrow(ctx); } } static void draw_logo(fz_context *ctx, fz_path *path) { /* Add signature logo here. */ }; static void rect_center(const fz_rect *rect, fz_point *c) { c->x = (rect->x0 + rect->x1) / 2.0f; c->y = (rect->y0 + rect->y1) / 2.0f; } static void center_rect_within_rect(const fz_rect *tofit, const fz_rect *within, fz_matrix *mat) { float xscale = (within->x1 - within->x0) / (tofit->x1 - tofit->x0); float yscale = (within->y1 - within->y0) / (tofit->y1 - tofit->y0); float scale = fz_min(xscale, yscale); fz_point tofit_center; fz_point within_center; rect_center(within, &within_center); rect_center(tofit, &tofit_center); /* Translate "tofit" to be centered on the origin * Scale "tofit" to a size that fits within "within" * Translate "tofit" to "within's" center * Do all the above in reverse order so that we can use the fz_pre_xx functions */ fz_translate(mat, within_center.x, within_center.y); fz_pre_scale(mat, scale, scale); fz_pre_translate(mat, -tofit_center.x, -tofit_center.y); } static void insert_signature_appearance_layers(pdf_document *doc, pdf_annot *annot) { fz_context *ctx = doc->ctx; pdf_obj *ap = pdf_dict_getp(annot->obj, "AP/N"); pdf_obj *main = NULL; pdf_obj *frm = NULL; pdf_obj *n0 = NULL; fz_rect bbox; fz_buffer *fzbuf = NULL; pdf_to_rect(ctx, pdf_dict_gets(ap, "BBox"), &bbox); fz_var(main); fz_var(frm); fz_var(n0); fz_var(fzbuf); fz_try(ctx) { main = pdf_new_xobject(doc, &bbox, &fz_identity); frm = pdf_new_xobject(doc, &bbox, &fz_identity); n0 = pdf_new_xobject(doc, &bbox, &fz_identity); pdf_dict_putp(main, "Resources/XObject/FRM", frm); fzbuf = fz_new_buffer(ctx, 8); fz_buffer_printf(ctx, fzbuf, "/FRM Do"); pdf_update_stream(doc, pdf_to_num(main), fzbuf); pdf_dict_puts_drop(main, "Length", pdf_new_int(doc, fzbuf->len)); fz_drop_buffer(ctx, fzbuf); fzbuf = NULL; pdf_dict_putp(frm, "Resources/XObject/n0", n0); pdf_dict_putp(frm, "Resources/XObject/n2", ap); fzbuf = fz_new_buffer(ctx, 8); fz_buffer_printf(ctx, fzbuf, "q 1 0 0 1 0 0 cm /n0 Do Q q 1 0 0 1 0 0 cm /n2 Do Q"); pdf_update_stream(doc, pdf_to_num(frm), fzbuf); pdf_dict_puts_drop(frm, "Length", pdf_new_int(doc, fzbuf->len)); fz_drop_buffer(ctx, fzbuf); fzbuf = NULL; fzbuf = fz_new_buffer(ctx, 8); fz_buffer_printf(ctx, fzbuf, "%% DSBlank"); pdf_update_stream(doc, pdf_to_num(n0), fzbuf); pdf_dict_puts_drop(n0, "Length", pdf_new_int(doc, fzbuf->len)); fz_drop_buffer(ctx, fzbuf); fzbuf = NULL; pdf_dict_putp(annot->obj, "AP/N", main); } fz_always(ctx) { pdf_drop_obj(main); pdf_drop_obj(frm); pdf_drop_obj(n0); } fz_catch(ctx) { fz_drop_buffer(ctx, fzbuf); fz_rethrow(ctx); } } static float logo_color[3] = {1.0f, 0.85f, 0.85f}; void pdf_set_signature_appearance(pdf_document *doc, pdf_annot *annot, char *name, char *dn, char *date) { fz_context *ctx = doc->ctx; const fz_matrix *page_ctm = &annot->page->ctm; pdf_obj *obj = annot->obj; pdf_obj *dr = pdf_dict_getp(pdf_trailer(doc), "Root/AcroForm/DR"); fz_display_list *dlist = NULL; fz_device *dev = NULL; font_info font_rec; fz_text *text = NULL; fz_colorspace *cs = NULL; fz_path *path = NULL; fz_buffer *fzbuf = NULL; if (!dr) pdf_dict_putp_drop(pdf_trailer(doc), "Root/AcroForm/DR", pdf_new_dict(doc, 1)); memset(&font_rec, 0, sizeof(font_rec)); fz_var(path); fz_var(dlist); fz_var(dev); fz_var(text); fz_var(cs); fz_var(fzbuf); fz_try(ctx) { char *da = pdf_to_str_buf(pdf_dict_gets(obj, "DA")); fz_rect rect = annot->rect; fz_rect logo_bounds; fz_matrix logo_tm; unsigned char *bufstr; dlist = fz_new_display_list(ctx); dev = fz_new_list_device(ctx, dlist); path = fz_new_path(ctx); draw_logo(ctx, path); fz_bound_path(ctx, path, NULL, &fz_identity, &logo_bounds); center_rect_within_rect(&logo_bounds, &rect, &logo_tm); fz_concat(&logo_tm, &logo_tm, page_ctm); cs = fz_device_rgb(ctx); fz_fill_path(dev, path, 0, &logo_tm, cs, logo_color, 1.0f); fz_drop_colorspace(ctx, cs); cs = NULL; get_font_info(doc, dr, da, &font_rec); switch (font_rec.da_rec.col_size) { case 1: cs = fz_device_gray(ctx); break; case 3: cs = fz_device_rgb(ctx); break; case 4: cs = fz_device_cmyk(ctx); break; } /* Display the name in the left-hand half of the form field */ rect.x1 = (rect.x0 + rect.x1)/2.0f; text = fit_text(ctx, &font_rec, name, &rect); fz_fill_text(dev, text, page_ctm, cs, font_rec.da_rec.col, 1.0f); fz_free_text(ctx, text); text = NULL; /* Display the distinguished name in the right-hand half */ fzbuf = fz_new_buffer(ctx, 256); fz_buffer_printf(ctx, fzbuf, "Digitally signed by %s\n", name); fz_buffer_printf(ctx, fzbuf, "DN: %s\n", dn); fz_buffer_printf(ctx, fzbuf, "Date: %s", date); (void)fz_buffer_storage(ctx, fzbuf, &bufstr); rect = annot->rect; rect.x0 = (rect.x0 + rect.x1)/2.0f; text = fit_text(ctx, &font_rec, (char *)bufstr, &rect); fz_fill_text(dev, text, page_ctm, cs, font_rec.da_rec.col, 1.0f); rect = annot->rect; fz_transform_rect(&rect, page_ctm); pdf_set_annot_appearance(doc, annot, &rect, dlist); /* Drop the cached xobject from the annotation structure to * force a redraw on next pdf_update_page call */ pdf_drop_xobject(ctx, annot->ap); annot->ap = NULL; insert_signature_appearance_layers(doc, annot); } fz_always(ctx) { fz_free_device(dev); fz_drop_display_list(ctx, dlist); font_info_fin(ctx, &font_rec); fz_free_path(ctx, path); fz_free_text(ctx, text); fz_drop_colorspace(ctx, cs); fz_drop_buffer(ctx, fzbuf); } fz_catch(ctx) { fz_rethrow(ctx); } }