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Only redraw the image when necessary

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This commit is contained in:
Chris Robinson 2019-07-23 12:51:14 -07:00
parent b8ac4b79e4
commit 18f1139de8
1 changed files with 16 additions and 5 deletions
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21
examples/alffplay.cpp
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@ -383,7 +383,7 @@ struct VideoState {
nanoseconds getClock();
void display(SDL_Window *screen, SDL_Renderer *renderer);
void updateVideo(SDL_Window *screen, SDL_Renderer *renderer);
void updateVideo(SDL_Window *screen, SDL_Renderer *renderer, bool redraw);
int handler();
};
@ -1158,7 +1158,7 @@ void VideoState::display(SDL_Window *screen, SDL_Renderer *renderer)
* handles updating the textures of decoded frames and displaying the latest
* frame.
*/
void VideoState::updateVideo(SDL_Window *screen, SDL_Renderer *renderer)
void VideoState::updateVideo(SDL_Window *screen, SDL_Renderer *renderer, bool redraw)
{
size_t read_idx{mPictQRead.load(std::memory_order_relaxed)};
Picture *vp{&mPictQ[read_idx]};
@ -1273,10 +1273,15 @@ void VideoState::updateVideo(SDL_Window *screen, SDL_Renderer *renderer)
SDL_UnlockTexture(mImage);
}
}
redraw = true;
}
/* Show the picture! */
display(screen, renderer);
if(redraw)
{
/* Show the picture! */
display(screen, renderer);
}
if(updated)
{
@ -1766,6 +1771,7 @@ int main(int argc, char *argv[])
last_time = cur_time;
}
bool force_redraw{false};
if(have_evt) do {
switch(event.type)
{
@ -1793,6 +1799,11 @@ int main(int argc, char *argv[])
case SDL_WINDOWEVENT_RESIZED:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderFillRect(renderer, nullptr);
force_redraw = true;
break;
case SDL_WINDOWEVENT_EXPOSED:
force_redraw = true;
break;
default:
@ -1841,7 +1852,7 @@ int main(int argc, char *argv[])
}
} while(SDL_PollEvent(&event));
movState->mVideo.updateVideo(screen, renderer);
movState->mVideo.updateVideo(screen, renderer, force_redraw);
}
std::cerr<< "SDL_WaitEvent error - "<<SDL_GetError() <<std::endl;