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We need faster string concatenation for performance-critical 

codepaths - this is being run every frame
This commit is contained in:
twinaphex 2019-04-30 19:36:40 +02:00
parent 662976608a
commit 4b22522ae0
2 changed files with 15 additions and 12 deletions
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19
gfx/video_driver.c
View File

@ -2249,10 +2249,8 @@ void video_driver_set_title_buf(void)
" ",
info.library_name,
sizeof(video_driver_title_buf));
strlcat(video_driver_title_buf,
" ", sizeof(video_driver_title_buf));
strlcat(video_driver_title_buf,
info.library_version,
string_concat(video_driver_title_buf, " ");
strlcat(video_driver_title_buf, info.library_version,
sizeof(video_driver_title_buf));
}
@ -2422,8 +2420,7 @@ void video_driver_frame(const void *data, unsigned width,
snprintf(video_info.fps_text, sizeof(video_info.fps_text),
"FPS: %6.1f", last_fps);
if (video_info.framecount_show)
strlcat(video_info.fps_text,
" || ", sizeof(video_info.fps_text));
string_concat(video_info.fps_text, " || ");
}
if (video_info.framecount_show)
@ -2433,8 +2430,7 @@ void video_driver_frame(const void *data, unsigned width,
sizeof(frames_text),
"%s: %" PRIu64, msg_hash_to_str(MSG_FRAMES),
(uint64_t)video_driver_frame_count);
strlcat(video_info.fps_text,
frames_text, sizeof(video_info.fps_text));
string_concat(video_info.fps_text, frames_text);
}
if ((video_driver_frame_count % FPS_UPDATE_INTERVAL) == 0)
@ -2445,10 +2441,9 @@ void video_driver_frame(const void *data, unsigned width,
if (!string_is_empty(video_info.fps_text))
{
strlcat(video_driver_window_title,
"|| ", sizeof(video_driver_window_title));
strlcat(video_driver_window_title,
video_info.fps_text, sizeof(video_driver_window_title));
string_concat(video_driver_window_title, "|| ");
string_concat(video_driver_window_title,
video_info.fps_text);
}
curr_time = new_time;

8
libretro-common/include/string/stdstring.h
View File

@ -45,6 +45,14 @@ static INLINE bool string_is_equal(const char *a, const char *b)
return (a && b) ? !strcmp(a, b) : false;
}
static INLINE char *string_concat(char *dst, char *src)
{
while (*dst)
dst++;
while ((*(dst)++ = *(src)++));
return --dst;
}
#define STRLEN_CONST(x) ((sizeof((x))-1))
#define string_is_not_equal(a, b) !string_is_equal((a), (b))