When GDK_SCALE is != 1 and egl is used, the presented image does not
fit to the window (scale of 2 is often used with hidpi monitors).
Usually this is not a problem since all components are adjusted by
gdk/gtk but with egl, pixel-based data is not being scaled. In this
case window's scale value can be used in order to determine whether
to use a pixel resource with higher resolution data.
---
In order to reproduce the problem set spice with virgl/Intel-vGPU
and run spice-gtk with GDK_SCALE=2
This patch is kind of RFC, it fixes the issue, but it's a bit hacky
and specific. I didn't come across other scale issues but it is likely
that more of these exist and better and generic fix is needed.
---
src/spice-widget-egl.c | 15 +--
src/spice-widget-priv.h | 1 +
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/spice-widget-egl.c b/src/spice-widget-egl.c
index 43fccd7..814a580 100644
--- a/src/spice-widget-egl.c
+++ b/src/spice-widget-egl.c
@@ -326,6 +326,8 @@ static gboolean spice_widget_init_egl_win(SpiceDisplay
*display, GdkWindow *win,
if (d->egl.surface)
return TRUE;
+d->egl.scale = gdk_window_get_scale_factor(win);
+
#ifdef GDK_WINDOWING_X11
if (GDK_IS_X11_WINDOW(win)) {
native = (EGLNativeWindowType)GDK_WINDOW_XID(win);
@@ -431,15 +433,17 @@ void spice_egl_resize_display(SpiceDisplay *display, int
w, int h)
{
SpiceDisplayPrivate *d = display->priv;
int prog;
+gint ws;
if (!gl_make_current(display, NULL))
return;
+ws = d->egl.scale;
glGetIntegerv(GL_CURRENT_PROGRAM, );
glUseProgram(d->egl.prog);
-apply_ortho(d->egl.mproj, 0, w, 0, h, -1, 1);
-glViewport(0, 0, w, h);
+apply_ortho(d->egl.mproj, 0, w * ws , 0, h * ws, -1, 1);
+glViewport(0, 0, w * ws, h * ws);
if (d->ready)
spice_egl_update_display(display);
@@ -559,6 +563,13 @@ void spice_egl_update_display(SpiceDisplay *display)
spice_display_get_scaling(display, , , , , );
+// Adjust to gdk scale
+s *= d->egl.scale;
+x *= d->egl.scale;
+y *= d->egl.scale;
+w *= d->egl.scale;
+h *= d->egl.scale;
+
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
diff --git a/src/spice-widget-priv.h b/src/spice-widget-priv.h
index 65eb404..8f110ac 100644
--- a/src/spice-widget-priv.h
+++ b/src/spice-widget-priv.h
@@ -149,6 +149,7 @@ struct _SpiceDisplayPrivate {
EGLImageKHR image;
gbooleancall_draw_done;
SpiceGlScanout scanout;
+gintscale;
} egl;
#endif // HAVE_EGL
double scroll_delta_y;
--
2.19.1
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