diff options
Diffstat (limited to 'gfx.c')
| -rw-r--r-- | gfx.c | 61 |
1 files changed, 43 insertions, 18 deletions
@@ -415,41 +415,66 @@ void DrawStringCenterUnderlineTruncated(int xl, int xr, int y, StringID str, uin GfxFillRect((xl + xr - w) / 2, y + 10, (xl + xr + w) / 2, y + 10, _string_colorremap[1]); } -static uint32 FormatStringLinebreaks(char *str, int maxw) +/** 'Correct' a string to a maximum length. Longer strings will be cut into + * additional lines at whitespace characters if possible. The string parameter + * is modified with terminating characters mid-string which are the + * placeholders for the newlines.<br/> + * The string WILL be truncated if there was no whitespace for the current + * line's maximum width. + * + * @note To know if the the terminating '\0' is the string end or just a + * newline, the returned 'num' value should be consulted. The num'th '\0', + * starting with index 0 is the real string end. + * + * @param str string to check and correct for length restrictions + * @param maxw the maximum width the string can have on one line + * @return return a 32bit wide number consisting of 2 packed values: + * 0 - 15 the number of lines ADDED to the string + * 16 - 31 the fontsize in which the length calculation was done at */ +uint32 FormatStringLinebreaks(char *str, int maxw) { - int num = 0; FontSize size = _cur_fontsize; - int w; - char *last_space; - byte c; + int num = 0; + + assert(maxw > 0); for (;;) { - w = 0; - last_space = NULL; + char *last_space = NULL; + int w = 0; for (;;) { - c = *str++; + byte c = *str++; + /* whitespace is where we will insert the line-break */ if (c == ASCII_LETTERSTART) last_space = str; if (c >= ASCII_LETTERSTART) { w += GetCharacterWidth(size, c); + /* string is longer than maximum width so we need to decide what to + * do. We can do two things: + * 1. If no whitespace was found at all up until now (on this line) then + * we will truncate the string and bail out. + * 2. In all other cases force a linebreak at the last seen whitespace */ if (w > maxw) { - str = last_space; - if (str == NULL) + if (last_space == NULL) { + str[-1] = '\0'; return num + (size << 16); + } + str = last_space; break; } } else { - if (c == 0) return num + (size << 16); - if (c == ASCII_NL) break; - - if (c == ASCII_SETX) str++; - else if (c == ASCII_SETXY) str += 2; - else if (c == ASCII_TINYFONT) size = FS_SMALL; - else if (c == ASCII_BIGFONT) size = FS_LARGE; + switch (c) { + case '\0': return num + (size << 16); break; + case ASCII_SETX: str++; break; + case ASCII_SETXY: str +=2; break; + case ASCII_TINYFONT: size = FS_SMALL; break; + case ASCII_BIGFONT: size = FS_LARGE; break; + case ASCII_NL: goto end_of_inner_loop; + } } } - +end_of_inner_loop: + /* string didn't fit on line, so 'dummy' terminate and increase linecount */ num++; str[-1] = '\0'; } |