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Emit images into PostScript output as strings rather than inline.

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This is a baby step toward having shared source patterns in the
PostScript output. This patch is based on original work by Keith
Packard in the following commit:

	06b83b89fc

One problem with this approach is that it attempts to put an entire
image into a PostScript string object. However, PostScript strings are
typically limited to 65k bytes. So, as is, this commit causes a few
failures for tests in the suite with large output images.
This commit is contained in:
Carl Worth 2006-04-04 11:21:17 -07:00
parent 0114393a13
commit d1134cd7e2
1 changed files with 43 additions and 15 deletions
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58
src/cairo-ps-surface.c
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@ -663,6 +663,18 @@ emit_image (cairo_ps_surface_t *surface,
cairo_image_surface_t *image,
cairo_matrix_t *matrix)
{
/* Using a single name for all images is fine since we immediately
* use the image and never again reference it. Later calls will
* re-use the same name which will just store new image data under
* the same entries in the PostScript dictionaries.
*
* Eventually, we'll want to emit a shared image once into the
* PostScript output and re-use it. In order to do that, we'll
* need to support multiple images "in flight" at the same time,
* which means we'll need to have unique names here one way or
* another.
*/
const char name[] = "Fallback";
cairo_status_t status;
unsigned char *rgb, *compressed;
unsigned long rgb_size, compressed_size;
@ -736,6 +748,26 @@ emit_image (cairo_ps_surface_t *surface,
goto bail2;
}
/* First emit the image data as a base85-encoded string which will
* be used as the data source for the image operator later. */
_cairo_output_stream_printf (surface->stream,
"/%sData\n", name);
_cairo_output_stream_printf (surface->stream,
"<~\n");
base85_stream = _cairo_base85_stream_create (surface->stream);
_cairo_output_stream_write (base85_stream, compressed, compressed_size);
_cairo_output_stream_close (base85_stream);
status = _cairo_output_stream_get_status (base85_stream);
if (status)
goto bail3;
_cairo_output_stream_destroy (base85_stream);
_cairo_output_stream_printf (surface->stream,
" def\n");
/* matrix transforms from user space to image space. We need to
* transform from device space to image space to compensate for
* postscripts coordinate system. */
@ -743,32 +775,28 @@ emit_image (cairo_ps_surface_t *surface,
cairo_matrix_multiply (&d2i, &d2i, matrix);
_cairo_output_stream_printf (surface->stream,
"/DeviceRGB setcolorspace\n"
"<<\n"
"/%sImage {\n"
" /DeviceRGB setcolorspace\n"
" <<\n"
" /ImageType 1\n"
" /Width %d\n"
" /Height %d\n"
" /BitsPerComponent 8\n"
" /Decode [ 0 1 0 1 0 1 ]\n"
" /DataSource currentfile /ASCII85Decode filter /LZWDecode filter \n"
" /DataSource %sData /LZWDecode filter \n"
" /ImageMatrix [ %f %f %f %f %f %f ]\n"
">>\n"
"image\n",
" >>\n"
" image\n"
"} def\n",
name,
opaque_image->width,
opaque_image->height,
name,
d2i.xx, d2i.yx,
d2i.xy, d2i.yy,
d2i.x0, d2i.y0);
/* Compressed image data (Base85 encoded) */
base85_stream = _cairo_base85_stream_create (surface->stream);
_cairo_output_stream_write (base85_stream, compressed, compressed_size);
_cairo_output_stream_close (base85_stream);
status = _cairo_output_stream_get_status (base85_stream);
_cairo_output_stream_destroy (base85_stream);
_cairo_output_stream_printf (surface->stream,
"%sImage\n", name);
bail3:
free (compressed);