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qemu/ui/gtk-gl-area.c
Weifeng Liu fdc09b028f ui/gtk-gl-area: Render guest content with padding in fixed-scale mode 
In fixed-scale mode (zoom-to-fit=false), we expect that scale should not
change, meaning that if window size is larger than guest surface,
padding is supposed to be added to preserve the scale. However, in
OpenGL mode (gl=on), guest surface is always painted to the whole canvas
without any padding. This change tries to fix this bug by adding
appropriate padding when drawing surfaces.

Signed-off-by: Weifeng Liu <weifeng.liu.z@gmail.com>
Message-ID: <20250511073337.876650-9-weifeng.liu.z@gmail.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2025-05-24 17:04:00 +02:00

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/*
* GTK UI -- glarea opengl code.
*
* Requires 3.16+ (GtkGLArea widget).
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "trace.h"
#include "ui/console.h"
#include "ui/gtk.h"
#include "ui/egl-helpers.h"
#include "system/system.h"
static void gtk_gl_area_set_scanout_mode(VirtualConsole *vc, bool scanout)
{
if (vc->gfx.scanout_mode == scanout) {
return;
}
vc->gfx.scanout_mode = scanout;
if (!vc->gfx.scanout_mode) {
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
egl_fb_destroy(&vc->gfx.guest_fb);
if (vc->gfx.surface) {
surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
}
}
}
/** DisplayState Callbacks (opengl version) **/
void gd_gl_area_draw(VirtualConsole *vc)
{
#ifdef CONFIG_GBM
QemuDmaBuf *dmabuf = vc->gfx.guest_fb.dmabuf;
#endif
int pw, ph, gs, y1, y2;
int ww, wh;
int ww_surface, wh_surface;
int fbw, fbh;
int wx_offset, wy_offset;
if (!vc->gfx.gls) {
return;
}
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
gs = gdk_window_get_scale_factor(gtk_widget_get_window(vc->gfx.drawing_area));
fbw = surface_width(vc->gfx.ds);
fbh = surface_height(vc->gfx.ds);
ww = gtk_widget_get_allocated_width(vc->gfx.drawing_area);
wh = gtk_widget_get_allocated_height(vc->gfx.drawing_area);
pw = ww * gs;
ph = wh * gs;
gd_update_scale(vc, ww, wh, fbw, fbh);
ww_surface = fbw * vc->gfx.scale_x;
wh_surface = fbh * vc->gfx.scale_y;
wx_offset = wy_offset = 0;
if (ww > ww_surface) {
wx_offset = (ww - ww_surface) / 2;
}
if (wh > wh_surface) {
wy_offset = (wh - wh_surface) / 2;
}
if (vc->gfx.scanout_mode) {
if (!vc->gfx.guest_fb.framebuffer) {
return;
}
#ifdef CONFIG_GBM
if (dmabuf) {
if (!qemu_dmabuf_get_draw_submitted(dmabuf)) {
return;
} else {
qemu_dmabuf_set_draw_submitted(dmabuf, false);
}
}
#endif
glBindFramebuffer(GL_READ_FRAMEBUFFER, vc->gfx.guest_fb.framebuffer);
/* GtkGLArea sets GL_DRAW_FRAMEBUFFER for us */
if (wx_offset > 0) {
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, wx_offset * gs, wh * gs);
glClear(GL_COLOR_BUFFER_BIT);
glScissor((ww - wx_offset) * gs, 0, wx_offset * gs, wh * gs);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
}
if (wy_offset > 0) {
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, ww * gs, wy_offset * gs);
glClear(GL_COLOR_BUFFER_BIT);
glScissor(0, (wh - wy_offset) * gs, ww * gs, wy_offset * gs);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
}
glViewport(0, 0, pw, ph);
y1 = vc->gfx.y0_top ? 0 : vc->gfx.h;
y2 = vc->gfx.y0_top ? vc->gfx.h : 0;
glBlitFramebuffer(0, y1, vc->gfx.w, y2,
wx_offset * gs, wy_offset * gs,
(ww - wx_offset) * gs, (wh - wy_offset) * gs,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
#ifdef CONFIG_GBM
if (dmabuf) {
egl_dmabuf_create_sync(dmabuf);
}
#endif
glFlush();
#ifdef CONFIG_GBM
if (dmabuf) {
int fence_fd;
egl_dmabuf_create_fence(dmabuf);
fence_fd = qemu_dmabuf_get_fence_fd(dmabuf);
if (fence_fd >= 0) {
qemu_set_fd_handler(fence_fd, gd_hw_gl_flushed, NULL, vc);
return;
}
graphic_hw_gl_block(vc->gfx.dcl.con, false);
}
#endif
} else {
if (!vc->gfx.ds) {
return;
}
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, pw, ph);
surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
}
}
void gd_gl_area_update(DisplayChangeListener *dcl,
int x, int y, int w, int h)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
if (!vc->gfx.gls || !vc->gfx.ds) {
return;
}
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
vc->gfx.glupdates++;
gdk_gl_context_clear_current();
}
void gd_gl_area_refresh(DisplayChangeListener *dcl)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
gd_update_monitor_refresh_rate(vc, vc->window ? vc->window : vc->gfx.drawing_area);
if (vc->gfx.guest_fb.dmabuf &&
qemu_dmabuf_get_draw_submitted(vc->gfx.guest_fb.dmabuf)) {
gd_gl_area_draw(vc);
return;
}
if (!vc->gfx.gls) {
if (!gtk_widget_get_realized(vc->gfx.drawing_area)) {
return;
}
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
vc->gfx.gls = qemu_gl_init_shader();
if (vc->gfx.ds) {
surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
}
}
graphic_hw_update(dcl->con);
if (vc->gfx.glupdates) {
vc->gfx.glupdates = 0;
gtk_gl_area_set_scanout_mode(vc, false);
gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
}
}
void gd_gl_area_switch(DisplayChangeListener *dcl,
DisplaySurface *surface)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
bool resized = true;
trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
if (vc->gfx.ds &&
surface_width(vc->gfx.ds) == surface_width(surface) &&
surface_height(vc->gfx.ds) == surface_height(surface)) {
resized = false;
}
if (vc->gfx.gls) {
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
surface_gl_create_texture(vc->gfx.gls, surface);
}
vc->gfx.ds = surface;
if (resized) {
gd_update_windowsize(vc);
}
}
static int gd_cmp_gl_context_version(int major, int minor, QEMUGLParams *params)
{
if (major > params->major_ver) {
return 1;
}
if (major < params->major_ver) {
return -1;
}
if (minor > params->minor_ver) {
return 1;
}
if (minor < params->minor_ver) {
return -1;
}
return 0;
}
QEMUGLContext gd_gl_area_create_context(DisplayGLCtx *dgc,
QEMUGLParams *params)
{
VirtualConsole *vc = container_of(dgc, VirtualConsole, gfx.dgc);
GdkWindow *window;
GdkGLContext *ctx;
GError *err = NULL;
int major, minor;
window = gtk_widget_get_window(vc->gfx.drawing_area);
ctx = gdk_window_create_gl_context(window, &err);
if (err) {
g_printerr("Create gdk gl context failed: %s\n", err->message);
g_error_free(err);
return NULL;
}
gdk_gl_context_set_required_version(ctx,
params->major_ver,
params->minor_ver);
gdk_gl_context_realize(ctx, &err);
if (err) {
g_printerr("Realize gdk gl context failed: %s\n", err->message);
g_error_free(err);
g_clear_object(&ctx);
return NULL;
}
gdk_gl_context_make_current(ctx);
gdk_gl_context_get_version(ctx, &major, &minor);
gdk_gl_context_clear_current();
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
if (gd_cmp_gl_context_version(major, minor, params) == -1) {
/* created ctx version < requested version */
g_clear_object(&ctx);
}
trace_gd_gl_area_create_context(ctx, params->major_ver, params->minor_ver);
return ctx;
}
void gd_gl_area_destroy_context(DisplayGLCtx *dgc, QEMUGLContext ctx)
{
GdkGLContext *current_ctx = gdk_gl_context_get_current();
trace_gd_gl_area_destroy_context(ctx, current_ctx);
if (ctx == current_ctx) {
gdk_gl_context_clear_current();
}
g_clear_object(&ctx);
}
void gd_gl_area_scanout_texture(DisplayChangeListener *dcl,
uint32_t backing_id,
bool backing_y_0_top,
uint32_t backing_width,
uint32_t backing_height,
uint32_t x, uint32_t y,
uint32_t w, uint32_t h,
void *d3d_tex2d)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
vc->gfx.x = x;
vc->gfx.y = y;
vc->gfx.w = w;
vc->gfx.h = h;
vc->gfx.y0_top = backing_y_0_top;
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
if (backing_id == 0 || vc->gfx.w == 0 || vc->gfx.h == 0) {
gtk_gl_area_set_scanout_mode(vc, false);
return;
}
gtk_gl_area_set_scanout_mode(vc, true);
egl_fb_setup_for_tex(&vc->gfx.guest_fb, backing_width, backing_height,
backing_id, false);
}
void gd_gl_area_scanout_disable(DisplayChangeListener *dcl)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
gtk_gl_area_set_scanout_mode(vc, false);
}
void gd_gl_area_scanout_flush(DisplayChangeListener *dcl,
uint32_t x, uint32_t y, uint32_t w, uint32_t h)
{
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
if (vc->gfx.guest_fb.dmabuf &&
!qemu_dmabuf_get_draw_submitted(vc->gfx.guest_fb.dmabuf)) {
graphic_hw_gl_block(vc->gfx.dcl.con, true);
qemu_dmabuf_set_draw_submitted(vc->gfx.guest_fb.dmabuf, true);
gtk_gl_area_set_scanout_mode(vc, true);
}
gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
}
void gd_gl_area_scanout_dmabuf(DisplayChangeListener *dcl,
QemuDmaBuf *dmabuf)
{
#ifdef CONFIG_GBM
VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
uint32_t x, y, width, height, backing_width, backing_height, texture;
bool y0_top;
gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
egl_dmabuf_import_texture(dmabuf);
texture = qemu_dmabuf_get_texture(dmabuf);
if (!texture) {
return;
}
x = qemu_dmabuf_get_x(dmabuf);
y = qemu_dmabuf_get_y(dmabuf);
width = qemu_dmabuf_get_width(dmabuf);
height = qemu_dmabuf_get_height(dmabuf);
backing_width = qemu_dmabuf_get_backing_width(dmabuf);
backing_height = qemu_dmabuf_get_backing_height(dmabuf);
y0_top = qemu_dmabuf_get_y0_top(dmabuf);
gd_gl_area_scanout_texture(dcl, texture, y0_top,
backing_width, backing_height,
x, y, width, height, NULL);
if (qemu_dmabuf_get_allow_fences(dmabuf)) {
vc->gfx.guest_fb.dmabuf = dmabuf;
}
#endif
}
void gtk_gl_area_init(void)
{
display_opengl = 1;
}
int gd_gl_area_make_current(DisplayGLCtx *dgc,
QEMUGLContext ctx)
{
gdk_gl_context_make_current(ctx);
return 0;
}
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