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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(); nanoseconds getClock();
void display(SDL_Window *screen, SDL_Renderer *renderer); 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(); 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 * handles updating the textures of decoded frames and displaying the latest
* frame. * 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)}; size_t read_idx{mPictQRead.load(std::memory_order_relaxed)};
Picture *vp{&mPictQ[read_idx]}; Picture *vp{&mPictQ[read_idx]};
@ -1273,10 +1273,15 @@ void VideoState::updateVideo(SDL_Window *screen, SDL_Renderer *renderer)
SDL_UnlockTexture(mImage); SDL_UnlockTexture(mImage);
} }
} }
redraw = true;
} }
/* Show the picture! */ if(redraw)
display(screen, renderer); {
/* Show the picture! */
display(screen, renderer);
}
if(updated) if(updated)
{ {
@ -1766,6 +1771,7 @@ int main(int argc, char *argv[])
last_time = cur_time; last_time = cur_time;
} }
bool force_redraw{false};
if(have_evt) do { if(have_evt) do {
switch(event.type) switch(event.type)
{ {
@ -1793,6 +1799,11 @@ int main(int argc, char *argv[])
case SDL_WINDOWEVENT_RESIZED: case SDL_WINDOWEVENT_RESIZED:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderFillRect(renderer, nullptr); SDL_RenderFillRect(renderer, nullptr);
force_redraw = true;
break;
case SDL_WINDOWEVENT_EXPOSED:
force_redraw = true;
break; break;
default: default:
@ -1841,7 +1852,7 @@ int main(int argc, char *argv[])
} }
} while(SDL_PollEvent(&event)); } 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; std::cerr<< "SDL_WaitEvent error - "<<SDL_GetError() <<std::endl;