Delay window resize when minimized

On some window managers (e.g. on Windows), performing a resize while the
window is minimized does nothing (the restored window keeps its old
size).

Therefore, like for maximized and fullscreen states, wait for the window
to be restored to apply a resize.

Refs #3947 <https://github.com/Genymobile/scrcpy/issues/3947>

app/src/display.c

@@ -62,11 +62,17 @@ sc_display_init(struct sc_display *display, SDL_Window *window, bool mipmaps) {
         LOGD("Trilinear filtering disabled (not an OpenGL renderer");
     }
 
+    display->pending.flags = 0;
+    display->pending.frame = NULL;
+
     return true;
 }
 
 void
 sc_display_destroy(struct sc_display *display) {
+    if (display->pending.frame) {
+        av_frame_free(&display->pending.frame);
+    }
 #ifdef SC_DISPLAY_FORCE_OPENGL_CORE_PROFILE
     SDL_GL_DeleteContext(display->gl_context);
 #endif
@@ -84,7 +90,7 @@ sc_display_create_texture(struct sc_display *display,
                                              SDL_TEXTUREACCESS_STREAMING,
                                              size.width, size.height);
     if (!texture) {
-        LOGE("Could not create texture: %s", SDL_GetError());
+        LOGD("Could not create texture: %s", SDL_GetError());
         return NULL;
     }
 
@@ -104,8 +110,66 @@ sc_display_create_texture(struct sc_display *display,
     return texture;
 }
 
-bool
-sc_display_set_texture_size(struct sc_display *display, struct sc_size size) {
+static inline void
+sc_display_set_pending_size(struct sc_display *display, struct sc_size size) {
+    assert(!display->texture);
+    display->pending.size = size;
+    display->pending.flags |= SC_DISPLAY_PENDING_FLAG_SIZE;
+}
+
+static bool
+sc_display_set_pending_frame(struct sc_display *display, const AVFrame *frame) {
+    if (!display->pending.frame) {
+        display->pending.frame = av_frame_alloc();
+        if (!display->pending.frame) {
+            LOG_OOM();
+            return false;
+        }
+    }
+
+    int r = av_frame_ref(display->pending.frame, frame);
+    if (r) {
+        LOGE("Could not ref frame: %d", r);
+        return false;
+    }
+
+    display->pending.flags |= SC_DISPLAY_PENDING_FLAG_FRAME;
+
+    return true;
+}
+
+static bool
+sc_display_apply_pending(struct sc_display *display) {
+    if (display->pending.flags & SC_DISPLAY_PENDING_FLAG_SIZE) {
+        assert(!display->texture);
+        display->texture =
+            sc_display_create_texture(display, display->pending.size);
+        if (!display->texture) {
+            return false;
+        }
+
+        display->pending.flags &= ~SC_DISPLAY_PENDING_FLAG_SIZE;
+    }
+
+    if (display->pending.flags & SC_DISPLAY_PENDING_FLAG_FRAME) {
+        assert(display->pending.frame);
+        bool ok = sc_display_update_texture(display, display->pending.frame);
+        if (!ok) {
+            return false;
+        }
+
+        av_frame_unref(display->pending.frame);
+        display->pending.flags &= ~SC_DISPLAY_PENDING_FLAG_FRAME;
+    }
+
+    return true;
+}
+
+static bool
+sc_display_set_texture_size_internal(struct sc_display *display,
+                                     struct sc_size size) {
+    assert(size.width && size.height);
+
     if (display->texture) {
         SDL_DestroyTexture(display->texture);
     }
@@ -119,14 +183,27 @@ sc_display_set_texture_size(struct sc_display *display, struct sc_size size) {
     return true;
 }
 
-bool
-sc_display_update_texture(struct sc_display *display, const AVFrame *frame) {
+enum sc_display_result
+sc_display_set_texture_size(struct sc_display *display, struct sc_size size) {
+    bool ok = sc_display_set_texture_size_internal(display, size);
+    if (!ok) {
+        sc_display_set_pending_size(display, size);
+        return SC_DISPLAY_RESULT_PENDING;
+
+    }
+
+    return SC_DISPLAY_RESULT_OK;
+}
+
+static bool
+sc_display_update_texture_internal(struct sc_display *display,
+                                   const AVFrame *frame) {
     int ret = SDL_UpdateYUVTexture(display->texture, NULL,
                                    frame->data[0], frame->linesize[0],
                                    frame->data[1], frame->linesize[1],
                                    frame->data[2], frame->linesize[2]);
     if (ret) {
-        LOGE("Could not update texture: %s", SDL_GetError());
+        LOGD("Could not update texture: %s", SDL_GetError());
         return false;
     }
 
@@ -139,11 +216,32 @@ sc_display_update_texture(struct sc_display *display, const AVFrame *frame) {
     return true;
 }
 
-bool
+enum sc_display_result
+sc_display_update_texture(struct sc_display *display, const AVFrame *frame) {
+    bool ok = sc_display_update_texture_internal(display, frame);
+    if (!ok) {
+        ok = sc_display_set_pending_frame(display, frame);
+        if (!ok) {
+            LOGE("Could not set pending frame");
+            return SC_DISPLAY_RESULT_ERROR;
+        }
+
+        return SC_DISPLAY_RESULT_PENDING;
+    }
+
+    return SC_DISPLAY_RESULT_OK;
+}
+
+enum sc_display_result
 sc_display_render(struct sc_display *display, const SDL_Rect *geometry,
                   unsigned rotation) {
     SDL_RenderClear(display->renderer);
 
+    bool ok = sc_display_apply_pending(display);
+    if (!ok) {
+        return SC_DISPLAY_RESULT_PENDING;
+    }
+
     SDL_Renderer *renderer = display->renderer;
     SDL_Texture *texture = display->texture;
 
@@ -151,7 +249,7 @@ sc_display_render(struct sc_display *display, const SDL_Rect *geometry,
         int ret = SDL_RenderCopy(renderer, texture, NULL, geometry);
         if (ret) {
             LOGE("Could not render texture: %s", SDL_GetError());
-            return false;
+            return SC_DISPLAY_RESULT_ERROR;
         }
     } else {
         // rotation in RenderCopyEx() is clockwise, while screen->rotation is
@@ -176,10 +274,10 @@ sc_display_render(struct sc_display *display, const SDL_Rect *geometry,
                                    NULL, 0);
         if (ret) {
             LOGE("Could not render texture: %s", SDL_GetError());
-            return false;
+            return SC_DISPLAY_RESULT_ERROR;
         }
     }
 
     SDL_RenderPresent(display->renderer);
-    return true;
+    return SC_DISPLAY_RESULT_OK;
 }

app/src/display.h

@@ -24,6 +24,20 @@ struct sc_display {
 #endif
 
     bool mipmaps;
+
+    struct {
+#define SC_DISPLAY_PENDING_FLAG_SIZE 1
+#define SC_DISPLAY_PENDING_FLAG_FRAME 2
+        int8_t flags;
+        struct sc_size size;
+        AVFrame *frame;
+    } pending;
+};
+
+enum sc_display_result {
+    SC_DISPLAY_RESULT_OK,
+    SC_DISPLAY_RESULT_PENDING,
+    SC_DISPLAY_RESULT_ERROR,
 };
 
 bool
@@ -32,13 +46,13 @@ sc_display_init(struct sc_display *display, SDL_Window *window, bool mipmaps);
 void
 sc_display_destroy(struct sc_display *display);
 
-bool
+enum sc_display_result
 sc_display_set_texture_size(struct sc_display *display, struct sc_size size);
 
-bool
+enum sc_display_result
 sc_display_update_texture(struct sc_display *display, const AVFrame *frame);
 
-bool
+enum sc_display_result
 sc_display_render(struct sc_display *display, const SDL_Rect *geometry,
                   unsigned rotation);
 

app/src/screen.c

@@ -56,6 +56,7 @@ static void
 set_window_size(struct sc_screen *screen, struct sc_size new_size) {
     assert(!screen->fullscreen);
     assert(!screen->maximized);
+    assert(!screen->minimized);
     SDL_SetWindowSize(screen->window, new_size.width, new_size.height);
 }
 
@@ -249,9 +250,9 @@ sc_screen_render(struct sc_screen *screen, bool update_content_rect) {
         sc_screen_update_content_rect(screen);
     }
 
-    bool ok = sc_display_render(&screen->display, &screen->rect,
-                                screen->rotation);
-    (void) ok; // error already logged
+    enum sc_display_result res =
+        sc_display_render(&screen->display, &screen->rect, screen->rotation);
+    (void) res; // any error already logged
 }
 
 #if defined(__APPLE__) || defined(__WINDOWS__)
@@ -359,6 +360,7 @@ sc_screen_init(struct sc_screen *screen,
     screen->has_frame = false;
     screen->fullscreen = false;
     screen->maximized = false;
+    screen->minimized = false;
     screen->mouse_capture_key_pressed = 0;
 
     screen->req.x = params->window_x;
@@ -531,11 +533,11 @@ resize_for_content(struct sc_screen *screen, struct sc_size old_content_size,
 
 static void
 set_content_size(struct sc_screen *screen, struct sc_size new_content_size) {
-    if (!screen->fullscreen && !screen->maximized) {
+    if (!screen->fullscreen && !screen->maximized && !screen->minimized) {
         resize_for_content(screen, screen->content_size, new_content_size);
     } else if (!screen->resize_pending) {
         // Store the windowed size to be able to compute the optimal size once
-        // fullscreen and maximized are disabled
+        // fullscreen/maximized/minimized are disabled
         screen->windowed_content_size = screen->content_size;
         screen->resize_pending = true;
     }
@@ -547,6 +549,7 @@ static void
 apply_pending_resize(struct sc_screen *screen) {
     assert(!screen->fullscreen);
     assert(!screen->maximized);
+    assert(!screen->minimized);
     if (screen->resize_pending) {
         resize_for_content(screen, screen->windowed_content_size,
                                    screen->content_size);
@@ -583,15 +586,17 @@ sc_screen_init_size(struct sc_screen *screen) {
         get_rotated_size(screen->frame_size, screen->rotation);
     screen->content_size = content_size;
 
-    return sc_display_set_texture_size(&screen->display, screen->frame_size);
+    enum sc_display_result res =
+        sc_display_set_texture_size(&screen->display, screen->frame_size);
+    return res != SC_DISPLAY_RESULT_ERROR;
 }
 
 // recreate the texture and resize the window if the frame size has changed
-static bool
+static enum sc_display_result
 prepare_for_frame(struct sc_screen *screen, struct sc_size new_frame_size) {
     if (screen->frame_size.width == new_frame_size.width
             && screen->frame_size.height == new_frame_size.height) {
-        return true;
+        return SC_DISPLAY_RESULT_OK;
     }
 
     // frame dimension changed
@@ -615,13 +620,23 @@ sc_screen_update_frame(struct sc_screen *screen) {
     sc_fps_counter_add_rendered_frame(&screen->fps_counter);
 
     struct sc_size new_frame_size = {frame->width, frame->height};
-    if (!prepare_for_frame(screen, new_frame_size)) {
+    enum sc_display_result res = prepare_for_frame(screen, new_frame_size);
+    if (res == SC_DISPLAY_RESULT_ERROR) {
         return false;
     }
+    if (res == SC_DISPLAY_RESULT_PENDING) {
+        // Not an error, but do not continue
+        return true;
+    }
 
-    if (!sc_display_update_texture(&screen->display, frame)) {
+    res = sc_display_update_texture(&screen->display, frame);
+    if (res == SC_DISPLAY_RESULT_ERROR) {
         return false;
     }
+    if (res == SC_DISPLAY_RESULT_PENDING) {
+        // Not an error, but do not continue
+        return true;
+    }
 
     if (!screen->has_frame) {
         screen->has_frame = true;
@@ -647,7 +662,7 @@ sc_screen_switch_fullscreen(struct sc_screen *screen) {
     }
 
     screen->fullscreen = !screen->fullscreen;
-    if (!screen->fullscreen && !screen->maximized) {
+    if (!screen->fullscreen && !screen->maximized && !screen->minimized) {
         apply_pending_resize(screen);
     }
 
@@ -657,7 +672,7 @@ sc_screen_switch_fullscreen(struct sc_screen *screen) {
 
 void
 sc_screen_resize_to_fit(struct sc_screen *screen) {
-    if (screen->fullscreen || screen->maximized) {
+    if (screen->fullscreen || screen->maximized || screen->minimized) {
         return;
     }
 
@@ -681,7 +696,7 @@ sc_screen_resize_to_fit(struct sc_screen *screen) {
 
 void
 sc_screen_resize_to_pixel_perfect(struct sc_screen *screen) {
-    if (screen->fullscreen) {
+    if (screen->fullscreen || screen->minimized) {
         return;
     }
 
@@ -738,6 +753,9 @@ sc_screen_handle_event(struct sc_screen *screen, const SDL_Event *event) {
                 case SDL_WINDOWEVENT_MAXIMIZED:
                     screen->maximized = true;
                     break;
+                case SDL_WINDOWEVENT_MINIMIZED:
+                    screen->minimized = true;
+                    break;
                 case SDL_WINDOWEVENT_RESTORED:
                     if (screen->fullscreen) {
                         // On Windows, in maximized+fullscreen, disabling
@@ -748,6 +766,7 @@ sc_screen_handle_event(struct sc_screen *screen, const SDL_Event *event) {
                         break;
                     }
                     screen->maximized = false;
+                    screen->minimized = false;
                     apply_pending_resize(screen);
                     sc_screen_render(screen, true);
                     break;

app/src/screen.h

@@ -56,6 +56,7 @@ struct sc_screen {
     bool has_frame;
     bool fullscreen;
     bool maximized;
+    bool minimized;
 
     // To enable/disable mouse capture, a mouse capture key (LALT, LGUI or
     // RGUI) must be pressed. This variable tracks the pressed capture key.