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PDF: Compress the content stream

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Use cairo-deflate-stream to compress all content streams emitted by the
PDF surface.
This commit is contained in:
Adrian Johnson 2006-09-24 00:55:20 +09:30 • committed by Carl Worth
parent 7f246462eb
commit b02b86da5c
1 changed files with 29 additions and 3 deletions
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32
src/cairo-pdf-surface.c
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@ -129,6 +129,8 @@ typedef struct _cairo_pdf_surface {
cairo_pdf_resource_t self;
cairo_pdf_resource_t length;
long start_offset;
cairo_bool_t compressed;
cairo_output_stream_t *old_output;
} current_stream;
cairo_bool_t has_clip;
@ -146,8 +148,9 @@ _cairo_pdf_surface_clear (cairo_pdf_surface_t *surface);
static cairo_pdf_resource_t
_cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
cairo_bool_t compressed,
const char *fmt,
...) CAIRO_PRINTF_FORMAT(2, 3);
...) CAIRO_PRINTF_FORMAT(3, 4);
static void
_cairo_pdf_surface_close_stream (cairo_pdf_surface_t *surface);
@ -456,6 +459,7 @@ _cairo_pdf_surface_clear (cairo_pdf_surface_t *surface)
static cairo_pdf_resource_t
_cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
cairo_bool_t compressed,
const char *fmt,
...)
{
@ -464,12 +468,16 @@ _cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
surface->current_stream.active = TRUE;
surface->current_stream.self = _cairo_pdf_surface_new_object (surface);
surface->current_stream.length = _cairo_pdf_surface_new_object (surface);
surface->current_stream.compressed = compressed;
_cairo_output_stream_printf (surface->output,
"%d 0 obj\r\n"
"<< /Length %d 0 R\r\n",
surface->current_stream.self.id,
surface->current_stream.length.id);
if (compressed)
_cairo_output_stream_printf (surface->output,
" /Filter /FlateDecode\r\n");
if (fmt != NULL) {
va_start (ap, fmt);
@ -483,6 +491,11 @@ _cairo_pdf_surface_open_stream (cairo_pdf_surface_t *surface,
surface->current_stream.start_offset = _cairo_output_stream_get_position (surface->output);
if (compressed) {
surface->current_stream.old_output = surface->output;
surface->output = _cairo_deflate_stream_create (surface->output);
}
return surface->current_stream.self;
}
@ -494,6 +507,13 @@ _cairo_pdf_surface_close_stream (cairo_pdf_surface_t *surface)
if (! surface->current_stream.active)
return;
if (surface->current_stream.compressed) {
_cairo_output_stream_destroy (surface->output);
surface->output = surface->current_stream.old_output;
_cairo_output_stream_printf (surface->output,
"\r\n");
}
length = _cairo_output_stream_get_position (surface->output) -
surface->current_stream.start_offset;
_cairo_output_stream_printf (surface->output,
@ -577,6 +597,7 @@ _cairo_pdf_surface_resume_content_stream (cairo_pdf_surface_t *surface)
cairo_pdf_resource_t stream;
stream = _cairo_pdf_surface_open_stream (surface,
TRUE,
" /Type /XObject\r\n"
" /Subtype /Form\r\n"
" /BBox [ 0 0 %f %f ]\r\n",
@ -593,6 +614,7 @@ _cairo_pdf_surface_start_page (void *abstract_surface)
cairo_pdf_resource_t stream;
stream = _cairo_pdf_surface_open_stream (surface,
TRUE,
" /Type /XObject\r\n"
" /Subtype /Form\r\n"
" /BBox [ 0 0 %f %f ]\r\n",
@ -680,6 +702,7 @@ emit_smask (cairo_pdf_surface_t *surface,
}
*stream_ret = _cairo_pdf_surface_open_stream (surface,
FALSE,
" /Type /XObject\r\n"
" /Subtype /Image\r\n"
" /Width %d\r\n"
@ -789,12 +812,14 @@ emit_image (cairo_pdf_surface_t *surface,
if (need_smask)
*image_ret = _cairo_pdf_surface_open_stream (surface,
FALSE,
IMAGE_DICTIONARY
" /SMask %d 0 R\r\n",
image->width, image->height,
smask.id);
else
*image_ret = _cairo_pdf_surface_open_stream (surface,
FALSE,
IMAGE_DICTIONARY,
image->width, image->height);
@ -928,6 +953,7 @@ emit_surface_pattern (cairo_pdf_surface_t *surface,
cairo_matrix_scale (&pdf_p2d, 1.0, -1.0);
stream = _cairo_pdf_surface_open_stream (surface,
FALSE,
" /BBox [0 0 %d %d]\r\n"
" /XStep %d\r\n"
" /YStep %d\r\n"
@ -1942,7 +1968,7 @@ _cairo_pdf_surface_emit_outline_glyph (cairo_pdf_surface_t *surface,
if (status)
return status;
*glyph_ret = _cairo_pdf_surface_open_stream (surface, NULL);
*glyph_ret = _cairo_pdf_surface_open_stream (surface, FALSE, NULL);
_cairo_output_stream_printf (surface->output,
"0 0 %f %f %f %f d1\r\n",
@ -1997,7 +2023,7 @@ _cairo_pdf_surface_emit_bitmap_glyph (cairo_pdf_surface_t *surface,
return cairo_surface_status (&image->base);
}
*glyph_ret = _cairo_pdf_surface_open_stream (surface, NULL);
*glyph_ret = _cairo_pdf_surface_open_stream (surface, FALSE, NULL);
_cairo_output_stream_printf (surface->output,
"0 0 %f %f %f %f d1\r\n",