* bug#45124: Subject: 27.1; Image rendered from svg is too small on a hdpi display
@ 2020-12-08 18:28 Dov Grobgeld
2020-12-09 0:08 ` Alan Third
0 siblings, 1 reply; 3+ messages in thread
From: Dov Grobgeld @ 2020-12-08 18:28 UTC (permalink / raw)
To: 45124
[-- Attachment #1.1: Type: text/plain, Size: 25883 bytes --]
When loading an svg file into emacs by find file, e.g. the attached file
inkscape-drawing.svg, it is not rendered by the active x11 resolution. The
svg file has a native size of about 173.mm, but when loaded into emacs, its
width becomes about 95mm. My monitor is a 4k 27" screen which has a dpi of
about 163. It thus appears that the svg file is rendered at 90 dpi, since
90/167*173 ≈ 95.
Note that xdpinfo properly returns:
resolution: 162x161 dots per inch
--
In GNU Emacs 27.1 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.22,
cairo version 1.16.0)
of 2020-08-21 built on buildhw-x86-03.iad2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.12010000
System Description: Fedora 33 (Workstation Edition)
Recent messages:
Current locus from *grep*
Mark set
Grep finished with no matches found
Mark set
Grep finished with matches found [2 times]
Mark saved where search started [3 times]
Mark set
Mark saved where search started [2 times]
Type C-c C-c or C-c C-x to view the image as text or hex. [2 times]
delete-backward-char: Text is read-only
Configured using:
'configure --build=x86_64-redhat-linux-gnu
--host=x86_64-redhat-linux-gnu --program-prefix=
--disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
--libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/var/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
--with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
--with-gpm=no --with-xwidgets --with-modules --with-harfbuzz
--with-cairo --with-json build_alias=x86_64-redhat-linux-gnu
host_alias=x86_64-redhat-linux-gnu CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2
-flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
LDFLAGS=-Wl,-z,relro
PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'
Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER GMP
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Image[svg]
Minor modes in effect:
py-pdbtrack-is-tracking-p: t
xmsi-mode: t
show-paren-mode: t
yas-global-mode: t
yas-minor-mode: t
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magit-auto-revert-mode: t
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shell-dirtrack-mode: t
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tooltip-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t
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[-- Attachment #1.2: Type: text/html, Size: 27155 bytes --]
[-- Attachment #2: inkscape-drawing.svg --]
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^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#45124: Subject: 27.1; Image rendered from svg is too small on a hdpi display
2020-12-08 18:28 bug#45124: Subject: 27.1; Image rendered from svg is too small on a hdpi display Dov Grobgeld
@ 2020-12-09 0:08 ` Alan Third
2020-12-12 10:47 ` Alan Third
0 siblings, 1 reply; 3+ messages in thread
From: Alan Third @ 2020-12-09 0:08 UTC (permalink / raw)
To: Dov Grobgeld; +Cc: 45124
[-- Attachment #1: Type: text/plain, Size: 847 bytes --]
On Tue, Dec 08, 2020 at 08:28:43PM +0200, Dov Grobgeld wrote:
> When loading an svg file into emacs by find file, e.g. the attached file
> inkscape-drawing.svg, it is not rendered by the active x11 resolution. The
> svg file has a native size of about 173.mm, but when loaded into emacs, its
> width becomes about 95mm. My monitor is a 4k 27" screen which has a dpi of
> about 163. It thus appears that the svg file is rendered at 90 dpi, since
> 90/167*173 ≈ 95.
>
> Note that xdpinfo properly returns:
>
> resolution: 162x161 dots per inch
Something like the attached (patch against the master branch) might do
the trick...
This makes everything smaller on macOS, which isn't great because on
my laptop everything is already too small. I'm not sure what we'd have
to do to get SVGs rendering at roughly the right size.
--
Alan Third
[-- Attachment #2: 0001-Use-real-DPI-when-rendering-SVGs-bug-45124.patch --]
[-- Type: text/plain, Size: 4478 bytes --]
From 5a9e26a16b46797d10dee5c725877177d750e536 Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Wed, 9 Dec 2020 00:02:44 +0000
Subject: [PATCH] Use real DPI when rendering SVGs (bug#45124)
* src/image.c (svg_css_length_to_pixels): Pass in a DPI value instead
of using a hard coded value.
(svg_load_image): Set the DPI on the rsvg_handle, and pass it to
svg_css_length_to_pixels.
---
src/image.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/src/image.c b/src/image.c
index f16b9454a1..1523b4c5e3 100644
--- a/src/image.c
+++ b/src/image.c
@@ -9759,11 +9759,8 @@ svg_load (struct frame *f, struct image *img)
#if LIBRSVG_CHECK_VERSION (2, 46, 0)
static double
-svg_css_length_to_pixels (RsvgLength length)
+svg_css_length_to_pixels (RsvgLength length, double dpi)
{
- /* FIXME: 96 appears to be a pretty standard DPI but we should
- probably use the real DPI if we can get it. */
- double dpi = 96;
double value = length.length;
switch (length.unit)
@@ -9837,6 +9834,9 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
rsvg_handle = rsvg_handle_new_from_stream_sync (input_stream, base_file,
RSVG_HANDLE_FLAGS_NONE,
NULL, &err);
+ rsvg_handle_set_dpi_x_y (rsvg_handle, FRAME_DISPLAY_INFO (f)->resx,
+ FRAME_DISPLAY_INFO (f)->resy);
+
if (base_file)
g_object_unref (base_file);
g_object_unref (input_stream);
@@ -9848,6 +9848,9 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
rsvg_handle = rsvg_handle_new ();
eassume (rsvg_handle);
+ rsvg_handle_set_dpi_x_y (rsvg_handle, FRAME_DISPLAY_INFO (f)->resx,
+ FRAME_DISPLAY_INFO (f)->resy);
+
/* Set base_uri for properly handling referenced images (via 'href').
Can be explicitly specified using `:base_uri' image property.
See rsvg bug 596114 - "image refs are relative to curdir, not .svg file"
@@ -9872,6 +9875,7 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
/* Try the instrinsic dimensions first. */
gboolean has_width, has_height, has_viewbox;
RsvgLength iwidth, iheight;
+ double dpi = FRAME_DISPLAY_INFO (f)->resx;
rsvg_handle_get_intrinsic_dimensions (rsvg_handle,
&has_width, &iwidth,
@@ -9881,19 +9885,19 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
if (has_width && has_height)
{
/* Success! We can use these values directly. */
- viewbox_width = svg_css_length_to_pixels (iwidth);
- viewbox_height = svg_css_length_to_pixels (iheight);
+ viewbox_width = svg_css_length_to_pixels (iwidth, dpi);
+ viewbox_height = svg_css_length_to_pixels (iheight, dpi);
}
else if (has_width && has_viewbox)
{
- viewbox_width = svg_css_length_to_pixels (iwidth);
- viewbox_height = svg_css_length_to_pixels (iwidth)
+ viewbox_width = svg_css_length_to_pixels (iwidth, dpi);
+ viewbox_height = svg_css_length_to_pixels (iwidth, dpi)
* viewbox.width / viewbox.height;
}
else if (has_height && has_viewbox)
{
- viewbox_height = svg_css_length_to_pixels (iheight);
- viewbox_width = svg_css_length_to_pixels (iheight)
+ viewbox_height = svg_css_length_to_pixels (iheight, dpi);
+ viewbox_width = svg_css_length_to_pixels (iheight, dpi)
* viewbox.height / viewbox.width;
}
else if (has_viewbox)
@@ -10002,6 +10006,10 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
rsvg_handle = rsvg_handle_new_from_stream_sync (input_stream, base_file,
RSVG_HANDLE_FLAGS_NONE,
NULL, &err);
+
+ rsvg_handle_set_dpi_x_y (rsvg_handle, FRAME_DISPLAY_INFO (f)->resx,
+ FRAME_DISPLAY_INFO (f)->resy);
+
if (base_file)
g_object_unref (base_file);
g_object_unref (input_stream);
@@ -10013,6 +10021,9 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
rsvg_handle = rsvg_handle_new ();
eassume (rsvg_handle);
+ rsvg_handle_set_dpi_x_y (rsvg_handle, FRAME_DISPLAY_INFO (f)->resx,
+ FRAME_DISPLAY_INFO (f)->resy);
+
/* Set base_uri for properly handling referenced images (via 'href').
Can be explicitly specified using `:base_uri' image property.
See rsvg bug 596114 - "image refs are relative to curdir, not .svg file"
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* bug#45124: Subject: 27.1; Image rendered from svg is too small on a hdpi display
2020-12-09 0:08 ` Alan Third
@ 2020-12-12 10:47 ` Alan Third
0 siblings, 0 replies; 3+ messages in thread
From: Alan Third @ 2020-12-12 10:47 UTC (permalink / raw)
To: Dov Grobgeld, 45124-done
On Wed, Dec 09, 2020 at 12:08:20AM +0000, Alan Third wrote:
> On Tue, Dec 08, 2020 at 08:28:43PM +0200, Dov Grobgeld wrote:
> > When loading an svg file into emacs by find file, e.g. the attached file
> > inkscape-drawing.svg, it is not rendered by the active x11 resolution. The
> > svg file has a native size of about 173.mm, but when loaded into emacs, its
> > width becomes about 95mm. My monitor is a 4k 27" screen which has a dpi of
> > about 163. It thus appears that the svg file is rendered at 90 dpi, since
> > 90/167*173 ≈ 95.
> >
> > Note that xdpinfo properly returns:
> >
> > resolution: 162x161 dots per inch
>
> Something like the attached (patch against the master branch) might do
> the trick...
>
> This makes everything smaller on macOS, which isn't great because on
> my laptop everything is already too small. I'm not sure what we'd have
> to do to get SVGs rendering at roughly the right size.
I've pushed this change to the master branch. If it doesn't solve your
problem please reply to this email and we can reopen the bug report.
--
Alan Third
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-12-12 10:47 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-08 18:28 bug#45124: Subject: 27.1; Image rendered from svg is too small on a hdpi display Dov Grobgeld
2020-12-09 0:08 ` Alan Third
2020-12-12 10:47 ` Alan Third
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