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ui/egl: fix framebuffer reads

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Fix egl_fb_read() to use the (destination) surface size instead of the
(source) framebuffer source for glReadPixels.  Pass the DisplaySurface
instead of the pixeldata pointer to egl_fb_read() to make this possible.

With that in place framebuffer reads work fine even if the surface and
framebuffer sizes don't match, so we can remove the guest-triggerable
asserts in egl_scanout_flush().

Buglink: https://bugzilla.redhat.com//show_bug.cgi?id=1749659
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20190909073911.24787-1-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2019-09-09 09:39:11 +02:00
parent 89ea03a7dc
commit d2329237af
3 changed files with 5 additions and 7 deletions
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2
include/ui/egl-helpers.h
View File

@ -25,7 +25,7 @@ void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
GLuint texture, bool delete);
void egl_fb_setup_new_tex(egl_fb *fb, int width, int height);
void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip);
void egl_fb_read(void *dst, egl_fb *src);
void egl_fb_read(DisplaySurface *dst, egl_fb *src);
void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip);
void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,

4
ui/egl-headless.c
View File

@ -133,8 +133,6 @@ static void egl_scanout_flush(DisplayChangeListener *dcl,
if (!edpy->guest_fb.texture || !edpy->ds) {
return;
}
assert(surface_width(edpy->ds) == edpy->guest_fb.width);
assert(surface_height(edpy->ds) == edpy->guest_fb.height);
assert(surface_format(edpy->ds) == PIXMAN_x8r8g8b8);
if (edpy->cursor_fb.texture) {
@ -149,7 +147,7 @@ static void egl_scanout_flush(DisplayChangeListener *dcl,
egl_fb_blit(&edpy->blit_fb, &edpy->guest_fb, edpy->y_0_top);
}
egl_fb_read(surface_data(edpy->ds), &edpy->blit_fb);
egl_fb_read(edpy->ds, &edpy->blit_fb);
dpy_gfx_update(edpy->dcl.con, x, y, w, h);
}

6
ui/egl-helpers.c
View File

@ -102,12 +102,12 @@ void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip)
GL_COLOR_BUFFER_BIT, GL_LINEAR);
}
void egl_fb_read(void *dst, egl_fb *src)
void egl_fb_read(DisplaySurface *dst, egl_fb *src)
{
glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
glReadPixels(0, 0, src->width, src->height,
GL_BGRA, GL_UNSIGNED_BYTE, dst);
glReadPixels(0, 0, surface_width(dst), surface_height(dst),
GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst));
}
void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip)