When i can access to SDL_Rendrerer after maximizing window? - c

Question

I try to redraw window only when is need, but when window is resize in a hop (for example maximize), SDL_Renderer is not usable in new size some time after action.
Here is my simple example code:
#include <SDL2/SDL.h>
bool redraw = true;
void draw(SDL_Renderer* renderer, SDL_Rect& rect)
{
SDL_SetRenderDrawColor(renderer, 0, 0, 50, 0xFF);
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 90, 90, 90, 0xFF);
SDL_RenderDrawLine(renderer, 0, 0, rect.w, rect.h);
SDL_RenderPresent(renderer);
redraw = false;
}
SDL_Rect resize(const SDL_Event& event)
{
int win_w = (int) event.window.data1;
int win_h = (int) event.window.data2;
SDL_Rect rect = {0, 0, win_w, win_h};
redraw = true;
return rect;
}
int main(int argc, char** argv)
{
SDL_Init(SDL_INIT_TIMER | SDL_INIT_AUDIO | SDL_INIT_VIDEO);
SDL_Window* window = SDL_CreateWindow("Maximize test",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
800, 450, 0);
SDL_SetWindowResizable(window, SDL_TRUE);
SDL_Renderer* renderer = SDL_CreateRenderer(
window, -1,
SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
bool running = true;
SDL_Event event;
SDL_Rect rect = {0, 0, 800, 450};
while (running) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
running = false;
break;
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_RESIZED:
rect = resize(event);
break;
}
break;
}
if (redraw) {
draw(renderer, rect);
}
}
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
return 0;
}
At first, I try to get new renderer size SDL_GetRendererOutputSize in same result like getting size from event.
When I try to resize window with typical mouse motion actions, it works fine. But maximize or window manager resizing to one screen side does not work.
I try to use different event like SDL_WINDOWEVENT_SIZE_CHANGED, but with same result.
And yes, normally, I checks all SDL calls, with SDL_RenderDrawLine but without any errors.