SDL2 "skip" frames when mouse no moving - c++

Question

I'm trying to make some animation with SDL2.
SDL2 has some bad performance, and my simple chess game was running at 10fps.
I don't want to redraw the whole screen every frames, it takes way to long. So in order to optimize my game I decided to code an Animation class ( a simple fade in/out effect) which only redraw some part of the screen everyframe (basicly redraw the selected piece)
void myGame::sdlLoop() {
SDL_Event events;
bool quit = false;
while (!quit) {
bool redraw = false; //We assume we don't want to redraw everything (yet)
while (SDL_PollEvent(&events)) {
switch (events.key.keysym.scancode) {
....
}
if(redraw) draw(); // Only redraw whole screen IF NEEDED
else drawAnimations(); // Better use that for better performance
}
}
}
void myGame::drawAnimations(){
int i = 0;
while(i < arr.size()){
....
drawThingsAtCertainsPixels(now_time, animation_start_time, animation_duration); //Basicly a simple fade effect, something like
//pixelColor = color1 * advancement + color2 * (1 - advancement)
}
// Show the window
SDL_RenderPresent( m_renderer );
}
So far so good, but I noticed a weird behavior.
The animation is "jerky", most of the frames are skipped
I ended up avec all of my fadeout unfinished because the last frame where skipped.
But, when I constantly move the mouse, everything goes right and no frame are dropped
I think it is linked to SDL wanting to optimize performance, and only run at 100% speed when someting important is going on (user inputting things or windows interacted).
Do you know why is this happening, and how to fix that ?
I mean how to have SDL2 computing every frame even if I don't move the mouse.

Answer 1

I feel a bit guilty for finding the solution right after posting this question (but I swear I tore my hair out a lot)
The solution is quite simple
while (!quit) {
bool redraw = false; //We assume we don't want to redraw everything (yet)
while (SDL_PollEvent(&events)) {
switch (events.key.keysym.scancode) {
....
}
if(redraw) draw(); // Only redraw whole screen IF NEEDED
else drawAnimation(); // Better use that for better performance
}
}
Just move the drawAnimations() function a bit lower, out of the while (SDL_PollEvent(&events)) {
while (!quit) {
bool redraw = false; //We assume we don't want to redraw everything (yet)
while (SDL_PollEvent(&events)) {
switch (events.key.keysym.scancode) {
....
}
}
if(redraw) draw(); // Only redraw whole screen IF NEEDED
else drawAnimation(); // Better use that for better performance
}