diff options
| -rw-r--r-- | textscreen/txt_sdl.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/textscreen/txt_sdl.c b/textscreen/txt_sdl.c index 4f8bc2a8..cd7dd77d 100644 --- a/textscreen/txt_sdl.c +++ b/textscreen/txt_sdl.c @@ -263,19 +263,44 @@ static inline void UpdateCharacter(int x, int y) } } +static int LimitToRange(int val, int min, int max) +{ + if (val < min) + { + return min; + } + else if (val > max) + { + return max; + } + else + { + return val; + } +} + void TXT_UpdateScreenArea(int x, int y, int w, int h) { int x1, y1; + int x_end; + int y_end; + + x_end = LimitToRange(x + w, 0, TXT_SCREEN_W - 1); + y_end = LimitToRange(y + h, 0, TXT_SCREEN_H - 1); + x = LimitToRange(x, 0, TXT_SCREEN_W - 1); + y = LimitToRange(y, 0, TXT_SCREEN_H - 1); - for (y1=y; y1<y+h; ++y1) + for (y1=y; y1<y_end; ++y1) { - for (x1=x; x1<x+w; ++x1) + for (x1=x; x1<x_end; ++x1) { UpdateCharacter(x1, y1); } } - SDL_UpdateRect(screen, x * font->w, y * font->h, w * font->w, h * font->h); + SDL_UpdateRect(screen, + x * font->w, y * font->h, + (x_end - x) * font->w, (y_end - y) * font->h); } void TXT_UpdateScreen(void) |