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Add support for truetype subset to ps backend.
Same story as for the pdf backend: try to output a truetype subset if possible, otherwise fall back to a type3 font. Ajdust text output code to scale font accordingly and scale type3 fonts to unity.
This commit is contained in:
Kristian Høgsberg
Kristian Høgsberg
parent
2c6e799ee6
commit
3975d7f8a2
1 changed files with 105 additions and 8 deletions
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@ -211,6 +211,68 @@ _cairo_ps_surface_emit_header (cairo_ps_surface_t *surface)
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}
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}
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static cairo_status_t
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_cairo_ps_surface_emit_truetype_font_subset (cairo_ps_surface_t *surface,
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cairo_scaled_font_subset_t *font_subset)
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{
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cairo_truetype_subset_t subset;
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cairo_status_t status;
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int i;
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status = _cairo_truetype_subset_init (&subset, font_subset);
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if (status)
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return status;
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/* FIXME: Figure out document structure convention for fonts */
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_cairo_output_stream_printf (surface->final_stream,
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"11 dict begin\n"
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"/FontType 42 def\n"
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"/FontName /CairoFont-%d-%d def\n"
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"/PaintType 0 def\n"
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"/FontMatrix [ 1 0 0 1 0 0 ] def\n"
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"/FontBBox [ 0 0 0 0 ] def\n"
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"/Encoding 256 array def\n"
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"0 1 255 { Encoding exch /.notdef put } for\n",
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font_subset->font_id,
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font_subset->subset_id);
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/* FIXME: Figure out how subset->x_max etc maps to the /FontBBox */
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for (i = 1; i < font_subset->num_glyphs; i++)
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_cairo_output_stream_printf (surface->final_stream,
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"Encoding %d /g%d put\n", i, i);
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_cairo_output_stream_printf (surface->final_stream,
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"/CharStrings %d dict dup begin\n"
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"/.notdef 0 def\n",
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font_subset->num_glyphs);
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for (i = 1; i < font_subset->num_glyphs; i++)
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_cairo_output_stream_printf (surface->final_stream,
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"/g%d %d def\n", i, i);
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_cairo_output_stream_printf (surface->final_stream,
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"end readonly def\n");
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/* FIXME: We need to break up fonts bigger than 64k so we don't
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* exceed string size limitation. At glyph boundaries. Stupid
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* postscript. */
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_cairo_output_stream_printf (surface->final_stream,
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"/sfnts [<");
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_cairo_output_stream_write_hex_string (surface->final_stream,
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subset.data, subset.data_length);
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_cairo_output_stream_printf (surface->final_stream,
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">] def\n"
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"FontName currentdict end definefont pop\n");
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return CAIRO_STATUS_SUCCESS;
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}
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static void
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_cairo_ps_surface_emit_glyph (cairo_ps_surface_t *surface,
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cairo_scaled_font_t *scaled_font,
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@ -267,11 +329,13 @@ _cairo_ps_surface_emit_glyph (cairo_ps_surface_t *surface,
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"\t\t}\n");
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}
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static void
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_cairo_ps_surface_emit_font_subset (cairo_scaled_font_subset_t *font_subset,
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void *closure)
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static cairo_status_t
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_cairo_ps_surface_emit_type3_font_subset (cairo_ps_surface_t *surface,
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cairo_scaled_font_subset_t *font_subset)
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{
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cairo_ps_surface_t *surface = closure;
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cairo_matrix_t matrix;
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int i;
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_cairo_output_stream_printf (surface->final_stream,
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@ -282,12 +346,18 @@ _cairo_ps_surface_emit_font_subset (cairo_scaled_font_subset_t *font_subset,
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font_subset->font_id,
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font_subset->subset_id);
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matrix = font_subset->scaled_font->scale;
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cairo_matrix_invert (&matrix);
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_cairo_output_stream_printf (surface->final_stream,
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"\t/FontType\t3\n"
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"\t/FontMatrix\t[1 0 0 1 0 0]\n"
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"\t/FontMatrix\t[%f %f %f %f 0 0]\n"
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"\t/Encoding\t[0]\n"
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"\t/FontBBox\t[0 0 10 10]\n"
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"\t/Glyphs [\n");
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"\t/Glyphs [\n",
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matrix.xx,
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matrix.yx,
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-matrix.xy,
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-matrix.yy);
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for (i = 0; i < font_subset->num_glyphs; i++) {
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_cairo_ps_surface_emit_glyph (surface,
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@ -302,6 +372,25 @@ _cairo_ps_surface_emit_font_subset (cairo_scaled_font_subset_t *font_subset,
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"\t\texch get exec\n"
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"\t}\n"
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">> definefont pop\n");
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return CAIRO_STATUS_SUCCESS;
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}
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static void
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_cairo_ps_surface_emit_font_subset (cairo_scaled_font_subset_t *font_subset,
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void *closure)
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{
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cairo_ps_surface_t *surface = closure;
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cairo_status_t status;
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status = _cairo_ps_surface_emit_truetype_font_subset (surface, font_subset);
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if (status != CAIRO_INT_STATUS_UNSUPPORTED)
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return;
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status = _cairo_ps_surface_emit_type3_font_subset (surface, font_subset);
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if (status != CAIRO_INT_STATUS_UNSUPPORTED)
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return;
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}
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static cairo_status_t
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@ -1757,10 +1846,18 @@ _cairo_ps_surface_show_glyphs (void *abstract_surface,
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if (subset_id != current_subset_id) {
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_cairo_output_stream_printf (surface->stream,
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"/CairoFont-%d-%d 1 selectfont\n",
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font_id, subset_id);
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"/CairoFont-%d-%d findfont\n"
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"[ %f %f %f %f 0 0 ] makefont\n"
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"setfont\n",
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font_id,
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subset_id,
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scaled_font->scale.xx,
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scaled_font->scale.yx,
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-scaled_font->scale.xy,
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-scaled_font->scale.yy);
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current_subset_id = subset_id;
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}
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_cairo_output_stream_printf (surface->stream,
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"%f %f M <%c%c> S\n",
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glyphs[i].x, glyphs[i].y,
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