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fix mono rendering 

always render RGBA, then in mono mode just use the alpha
This commit is contained in:
John Cupitt 2021-04-12 17:29:54 +01:00
parent b27a10c547
commit 31fe274626
1 changed files with 31 additions and 25 deletions
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56
libvips/create/text.c
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@ -345,10 +345,10 @@ vips_text_build( VipsObject *object )
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsCreate *create = VIPS_CREATE( object );
VipsText *text = (VipsText *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 3 );
VipsRect extents;
int bands;
VipsInterpretation interpretation;
VipsImage *image;
cairo_surface_t *surface;
cairo_t *cr;
@ -407,36 +407,29 @@ vips_text_build( VipsObject *object )
return( -1 );
}
if( text->rgba ) {
interpretation = VIPS_INTERPRETATION_sRGB;
bands = 4;
}
else {
interpretation = VIPS_INTERPRETATION_MULTIBAND;
bands = 1;
}
/* Set DPI as pixels/mm.
*/
vips_image_init_fields( create->out,
extents.width, extents.height, bands,
image = t[0] = vips_image_new_memory();
vips_image_init_fields( image,
extents.width, extents.height, 4,
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
interpretation, text->dpi / 25.4, text->dpi / 25.4 );
VIPS_INTERPRETATION_sRGB,
text->dpi / 25.4, text->dpi / 25.4 );
vips_image_pipelinev( create->out, VIPS_DEMAND_STYLE_ANY, NULL );
create->out->Xoffset = extents.left;
create->out->Yoffset = extents.top;
vips_image_pipelinev( image, VIPS_DEMAND_STYLE_ANY, NULL );
image->Xoffset = extents.left;
image->Yoffset = extents.top;
if( vips_image_write_prepare( create->out ) ) {
if( vips_image_write_prepare( image ) ) {
g_mutex_unlock( vips_text_lock );
return( -1 );
}
surface = cairo_image_surface_create_for_data(
VIPS_IMAGE_ADDR( create->out, 0, 0 ),
text->rgba ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8,
create->out->Xsize, create->out->Ysize,
VIPS_IMAGE_SIZEOF_LINE( create->out ) );
VIPS_IMAGE_ADDR( image, 0, 0 ),
CAIRO_FORMAT_ARGB32,
image->Xsize, image->Ysize,
VIPS_IMAGE_SIZEOF_LINE( image ) );
cr = cairo_create( surface );
cairo_surface_destroy( surface );
@ -454,12 +447,25 @@ vips_text_build( VipsObject *object )
/* Cairo makes pre-multipled BRGA -- we must byteswap and
* unpremultiply.
*/
for( y = 0; y < create->out->Ysize; y++ )
for( y = 0; y < image->Ysize; y++ )
vips__premultiplied_bgra2rgba(
(guint32 *)
VIPS_IMAGE_ADDR( create->out, 0, y ),
create->out->Xsize );
VIPS_IMAGE_ADDR( image, 0, y ),
image->Xsize );
}
else {
/* We just want the alpha channel.
*/
if( vips_extract_band( image, &t[1], 3, NULL ) ||
vips_copy( t[1], &t[2],
"interpretation", VIPS_INTERPRETATION_MULTIBAND,
NULL ) )
return( -1 );
image = t[2];
}
if( vips_image_write( image, create->out ) )
return( -1 );
return( 0 );
}