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clarify docs for pdfload 

Expand note on @background for pdfload.

See https://github.com/libvips/libvips/issues/1412
This commit is contained in:
John Cupitt 2019-08-28 06:47:48 +01:00
parent e129d85330
commit c1e46c53b5
1 changed files with 6 additions and 3 deletions
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7
libvips/foreign/pdfload.c
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@ -324,6 +324,9 @@ vips_foreign_load_pdf_header( VipsForeignLoad *load )
vips_foreign_load_pdf_set_image( pdf, load->out ); vips_foreign_load_pdf_set_image( pdf, load->out );
/* Convert the background to the image format. /* Convert the background to the image format.
*
* FIXME ... we probably should convert this to pre-multiplied BGRA
* to match the Cairo convention. See vips__cairo2rgba().
*/ */
if( !(pdf->ink = vips__vector_to_ink( class->nickname, if( !(pdf->ink = vips__vector_to_ink( class->nickname,
load->out, load->out,
@ -747,8 +750,8 @@ vips_foreign_load_pdf_is_a( const char *filename )
* you can scale the rendering from the default 1 point == 1 pixel by * you can scale the rendering from the default 1 point == 1 pixel by
* setting @scale. * setting @scale.
* *
* Use @background to set the background colour, including transparency. The * Use @background to set the background RGBA colour. The default is 255
* default is 255 (solid white). * (solid white), use eg. 0 for a transparent background.
* *
* The operation fills a number of header fields with metadata, for example * The operation fills a number of header fields with metadata, for example
* "pdf-author". They may be useful. * "pdf-author". They may be useful.