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PDF: Include subset tag in font name
PDF requires font names of subsetted fonts to be preprended with "XXXXXX+" where XXXXXX is a sequence of 6 uppercase letters unique the font and the set of glyphs in the subset.
This commit is contained in:
Adrian Johnson
parent
c4e54629bb
commit
1deb1e4510
1 changed files with 104 additions and 8 deletions
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@ -3210,6 +3210,85 @@ _cairo_pdf_surface_emit_unicode_for_glyph (cairo_pdf_surface_t *surface,
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return CAIRO_STATUS_SUCCESS;
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}
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/* Bob Jenkins hash
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*
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* Public domain code from:
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* http://burtleburtle.net/bob/hash/doobs.html
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*/
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#define HASH_MIX(a,b,c) \
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{ \
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a -= b; a -= c; a ^= (c>>13); \
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b -= c; b -= a; b ^= (a<<8); \
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c -= a; c -= b; c ^= (b>>13); \
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a -= b; a -= c; a ^= (c>>12); \
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b -= c; b -= a; b ^= (a<<16); \
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c -= a; c -= b; c ^= (b>>5); \
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a -= b; a -= c; a ^= (c>>3); \
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b -= c; b -= a; b ^= (a<<10); \
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c -= a; c -= b; c ^= (b>>15); \
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}
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static uint32_t
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_hash_data (const unsigned char *data, int length, uint32_t initval)
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{
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uint32_t a, b, c, len;
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len = length;
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a = b = 0x9e3779b9; /* the golden ratio; an arbitrary value */
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c = initval; /* the previous hash value */
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while (len >= 12) {
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a += (data[0] + ((uint32_t)data[1]<<8) + ((uint32_t)data[2]<<16) + ((uint32_t)data[3]<<24));
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b += (data[4] + ((uint32_t)data[5]<<8) + ((uint32_t)data[6]<<16) + ((uint32_t)data[7]<<24));
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c += (data[8] + ((uint32_t)data[9]<<8) + ((uint32_t)data[10]<<16)+ ((uint32_t)data[11]<<24));
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HASH_MIX (a,b,c);
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data += 12;
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len -= 12;
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}
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c += length;
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switch(len) {
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case 11: c+= ((uint32_t) data[10] << 24);
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case 10: c+= ((uint32_t) data[9] << 16);
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case 9 : c+= ((uint32_t) data[8] << 8);
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case 8 : b+= ((uint32_t) data[7] << 24);
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case 7 : b+= ((uint32_t) data[6] << 16);
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case 6 : b+= ((uint32_t) data[5] << 8);
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case 5 : b+= data[4];
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case 4 : a+= ((uint32_t) data[3] << 24);
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case 3 : a+= ((uint32_t) data[2] << 16);
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case 2 : a+= ((uint32_t) data[1] << 8);
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case 1 : a+= data[0];
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}
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HASH_MIX (a,b,c);
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return c;
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}
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static void
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_create_font_subset_tag (cairo_scaled_font_subset_t *font_subset,
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const char *font_name,
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char *tag)
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{
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uint32_t hash;
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int i;
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long numerator;
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ldiv_t d;
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hash = _hash_data ((unsigned char *) font_name, strlen(font_name), 0);
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hash = _hash_data ((unsigned char *) (font_subset->glyphs),
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font_subset->num_glyphs * sizeof(unsigned long), hash);
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numerator = abs (hash);
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for (i = 0; i < 6; i++) {
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d = ldiv (numerator, 26);
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numerator = d.quot;
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tag[i] = 'A' + d.rem;
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}
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tag[i] = 0;
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}
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static cairo_int_status_t
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_cairo_pdf_surface_emit_to_unicode_stream (cairo_pdf_surface_t *surface,
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cairo_scaled_font_subset_t *font_subset,
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@ -3306,6 +3385,9 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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cairo_pdf_font_t font;
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unsigned int i;
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cairo_status_t status;
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char tag[10];
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_create_font_subset_tag (font_subset, subset->base_font, tag);
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subset_resource = _cairo_pdf_surface_get_font_resource (surface,
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font_subset->font_id,
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@ -3340,7 +3422,7 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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_cairo_output_stream_printf (surface->output,
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"%d 0 obj\n"
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"<< /Type /FontDescriptor\n"
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" /FontName /%s\n"
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" /FontName /%s+%s\n"
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" /Flags 4\n"
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" /FontBBox [ %ld %ld %ld %ld ]\n"
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" /ItalicAngle 0\n"
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@ -3353,6 +3435,7 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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">>\n"
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"endobj\n",
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descriptor.id,
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tag,
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subset->base_font,
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subset->x_min,
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subset->y_min,
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@ -3370,7 +3453,7 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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"%d 0 obj\n"
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"<< /Type /Font\n"
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" /Subtype /CIDFontType0\n"
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" /BaseFont /%s\n"
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" /BaseFont /%s+%s\n"
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" /CIDSystemInfo\n"
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" << /Registry (Adobe)\n"
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" /Ordering (Identity)\n"
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@ -3379,6 +3462,7 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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" /FontDescriptor %d 0 R\n"
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" /W [0 [",
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cidfont_dict.id,
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tag,
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subset->base_font,
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descriptor.id);
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@ -3397,10 +3481,11 @@ _cairo_pdf_surface_emit_cff_font (cairo_pdf_surface_t *surface,
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"%d 0 obj\n"
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"<< /Type /Font\n"
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" /Subtype /Type0\n"
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" /BaseFont /%s\n"
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" /BaseFont /%s+%s\n"
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" /Encoding /Identity-H\n"
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" /DescendantFonts [ %d 0 R]\n",
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subset_resource.id,
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tag,
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subset->base_font,
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cidfont_dict.id);
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@ -3473,6 +3558,9 @@ _cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
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cairo_status_t status;
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unsigned long length;
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unsigned int i;
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char tag[10];
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_create_font_subset_tag (font_subset, subset->base_font, tag);
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subset_resource = _cairo_pdf_surface_get_font_resource (surface,
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font_subset->font_id,
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@ -3512,7 +3600,7 @@ _cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
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_cairo_output_stream_printf (surface->output,
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"%d 0 obj\n"
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"<< /Type /FontDescriptor\n"
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" /FontName /%s\n"
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" /FontName /%s+%s\n"
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" /Flags 4\n"
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" /FontBBox [ %ld %ld %ld %ld ]\n"
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" /ItalicAngle 0\n"
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@ -3525,6 +3613,7 @@ _cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
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">>\n"
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"endobj\n",
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descriptor.id,
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tag,
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subset->base_font,
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subset->x_min,
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subset->y_min,
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@ -3539,12 +3628,13 @@ _cairo_pdf_surface_emit_type1_font (cairo_pdf_surface_t *surface,
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"%d 0 obj\n"
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"<< /Type /Font\n"
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" /Subtype /Type1\n"
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" /BaseFont /%s\n"
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" /BaseFont /%s+%s\n"
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" /FirstChar 0\n"
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" /LastChar %d\n"
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" /FontDescriptor %d 0 R\n"
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" /Widths [",
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subset_resource.id,
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tag,
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subset->base_font,
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font_subset->num_glyphs - 1,
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descriptor.id);
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@ -3626,6 +3716,7 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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cairo_pdf_font_t font;
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cairo_truetype_subset_t subset;
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unsigned int i;
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char tag[10];
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subset_resource = _cairo_pdf_surface_get_font_resource (surface,
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font_subset->font_id,
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@ -3637,6 +3728,8 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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if (unlikely (status))
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return status;
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_create_font_subset_tag (font_subset, subset.base_font, tag);
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status = _cairo_pdf_surface_open_stream (surface,
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NULL,
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TRUE,
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@ -3673,7 +3766,7 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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_cairo_output_stream_printf (surface->output,
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"%d 0 obj\n"
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"<< /Type /FontDescriptor\n"
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" /FontName /%s\n"
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" /FontName /%s+%s\n"
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" /Flags 4\n"
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" /FontBBox [ %ld %ld %ld %ld ]\n"
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" /ItalicAngle 0\n"
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@ -3686,6 +3779,7 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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">>\n"
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"endobj\n",
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descriptor.id,
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tag,
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subset.base_font,
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(long)(subset.x_min*PDF_UNITS_PER_EM),
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(long)(subset.y_min*PDF_UNITS_PER_EM),
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@ -3706,7 +3800,7 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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"%d 0 obj\n"
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"<< /Type /Font\n"
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" /Subtype /CIDFontType2\n"
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" /BaseFont /%s\n"
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" /BaseFont /%s+%s\n"
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" /CIDSystemInfo\n"
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" << /Registry (Adobe)\n"
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" /Ordering (Identity)\n"
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@ -3715,6 +3809,7 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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" /FontDescriptor %d 0 R\n"
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" /W [0 [",
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cidfont_dict.id,
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tag,
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subset.base_font,
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descriptor.id);
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@ -3733,10 +3828,11 @@ _cairo_pdf_surface_emit_truetype_font_subset (cairo_pdf_surface_t *surface,
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"%d 0 obj\n"
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"<< /Type /Font\n"
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" /Subtype /Type0\n"
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" /BaseFont /%s\n"
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" /BaseFont /%s+%s\n"
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" /Encoding /Identity-H\n"
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" /DescendantFonts [ %d 0 R]\n",
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subset_resource.id,
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tag,
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subset.base_font,
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cidfont_dict.id);
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