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allow both dpi and scale to be set for pdfload

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pdfload didn't allow both dpi and scale to be set. This patch makes the
two settings combine if both are given.

thanks le0daniel

see https://github.com/libvips/libvips/issues/1824
This commit is contained in:
John Cupitt 2020-09-21 09:29:25 +01:00
parent dc88d6c1e1
commit 0c7b65e156
2 changed files with 16 additions and 11 deletions
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1
ChangeLog
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@ -5,6 +5,7 @@
- in jpegsave, don't set JFIF resolution if we set EXIF resolution
- bump minimum libheif version to 1.3 [lovell]
- dzsave in iiif mode could set info.json dimensions off by one [Linden6]
- pdfload allows dpi and scale to both be set [le0daniel]
9/8/20 started 8.10.1
- fix markdown -> xml conversion in doc generation

26
libvips/foreign/pdfload.c
View File

@ -16,6 +16,8 @@
* - reopen the input if we minimised too early
* 11/3/20
* - move on top of VipsSource
* 21/9/20
* - allow dpi and scale to both be set [le0daniel]
*/
/*
@ -109,10 +111,14 @@ typedef struct _VipsForeignLoadPdf {
*/
double dpi;
/* Calculate this from DPI. At 72 DPI, we render 1:1 with cairo.
/* Scale by this factor.
*/
double scale;
/* The total scale factor we render with.
*/
double total_scale;
/* Background colour.
*/
VipsArrayDouble *background;
@ -170,8 +176,7 @@ vips_foreign_load_pdf_build( VipsObject *object )
GError *error = NULL;
if( !vips_object_argument_isset( object, "scale" ) )
pdf->scale = pdf->dpi / 72.0;
pdf->total_scale = pdf->scale * pdf->dpi / 72.0;
pdf->stream = vips_g_input_stream_new_from_source( pdf->source );
if( !(pdf->doc = poppler_document_new_from_stream( pdf->stream,
@ -338,8 +343,8 @@ vips_foreign_load_pdf_header( VipsForeignLoad *load )
* does round to nearest. Without this, things like
* shrink-on-load will break.
*/
pdf->pages[i].width = VIPS_RINT( width * pdf->scale );
pdf->pages[i].height = VIPS_RINT( height * pdf->scale );
pdf->pages[i].width = VIPS_RINT( width * pdf->total_scale );
pdf->pages[i].height = VIPS_RINT( height * pdf->total_scale );
if( pdf->pages[i].width > pdf->image.width )
pdf->image.width = pdf->pages[i].width;
@ -421,10 +426,10 @@ vips_foreign_load_pdf_generate( VipsRegion *or,
cr = cairo_create( surface );
cairo_surface_destroy( surface );
cairo_scale( cr, pdf->scale, pdf->scale );
cairo_scale( cr, pdf->total_scale, pdf->total_scale );
cairo_translate( cr,
(pdf->pages[i].left - rect.left) / pdf->scale,
(pdf->pages[i].top - rect.top) / pdf->scale );
(pdf->pages[i].left - rect.left) / pdf->total_scale,
(pdf->pages[i].top - rect.top) / pdf->total_scale );
/* poppler is single-threaded, but we don't need to lock since
* we're running inside a non-threaded tilecache.
@ -862,9 +867,8 @@ vips_foreign_load_pdf_is_a( const char *filename )
* left. Set to -1 to mean "until the end of the document". Use vips_grid()
* to change page layout.
*
* Use @dpi to set the rendering resolution. The default is 72. Alternatively,
* you can scale the rendering from the default 1 point == 1 pixel by
* setting @scale.
* Use @dpi to set the rendering resolution. The default is 72. Additionally,
* you can scale by setting @scale. If you set both, they combine.
*
* Use @background to set the background RGBA colour. The default is 255
* (solid white), use eg. 0 for a transparent background.