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Optimize controller_frame_vector::compatible()

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This commit is contained in:
Ilari Liusvaara 2014-01-16 12:55:40 +02:00
parent 31ff9a4b8f
commit dffe0de67e
1 changed files with 20 additions and 2 deletions
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22
src/library/controller-data.cpp
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@ -660,11 +660,29 @@ bool controller_frame_vector::compatible(controller_frame_vector& with, uint64_t
//sync done.
uint64_t syncs_seen = 0;
uint64_t frames_read = 0;
size_t old_size = size();
size_t new_size = with.size();
size_t pagenum = 0;
size_t ocomplete_pages = old_size / frames_per_page; //Round DOWN
size_t ncomplete_pages = new_size / frames_per_page; //Round DOWN
size_t complete_pages = min(ocomplete_pages, ncomplete_pages);
while(syncs_seen + frames_per_page < frame - 1 && pagenum < complete_pages) {
//Fast process page. The above condition guarantees that these pages are completely used.
auto opagedata = pages[pagenum].content;
auto npagedata = with.pages[pagenum].content;
size_t pagedataamt = frames_per_page * frame_size;
if(memcmp(opagedata, npagedata, pagedataamt))
return false;
frames_read += frames_per_page;
pagenum++;
for(size_t i = 0; i < pagedataamt; i += frame_size)
if(opagedata[i] & 1) syncs_seen++;
}
while(syncs_seen < frame - 1) {
controller_frame oldc = blank_frame(true), newc = with.blank_frame(true);
if(frames_read < size())
if(frames_read < old_size)
oldc = (*this)[frames_read];
if(frames_read < with.size())
if(frames_read < new_size)
newc = with[frames_read];
if(oldc != newc)
return false; //Mismatch.