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Dont resize scratch unneccessarily

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Kovid Goyal 2021-06-16 21:40:17 +05:30
parent 22af8ab304
commit 12e9769b4b
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1 changed files with 8 additions and 4 deletions
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12
src/calibre/srv/fast_css_transform.cpp
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@ -432,6 +432,11 @@ class Token {
for (size_t i = 0; i < text.size(); i++) text[i] = src[i];
}
void set_ascii_text(const char *txt, int sz) {
text.resize(sz);
for (int i = 0; i < sz; i++) text[i] = txt[i];
}
bool convert_absolute_font_size(std::string &scratch) {
if (!unit_at || !text_as_ascii_lowercase(scratch)) return false;
frozen::string unit(scratch.data() + unit_at, scratch.size() - unit_at);
@ -440,11 +445,10 @@ class Token {
double val = parse_css_number<std::string>(scratch, unit_at).as_double();
double new_val = convert_font_size(val, lit->second);
if (val == new_val) return false;
scratch.reserve(128); scratch.clear(); scratch.resize(128);
int num = std::snprintf(&scratch[0], scratch.capacity(), "%grem", new_val);
char txt[128];
int num = std::snprintf(txt, sizeof(txt), "%grem", new_val);
if (num <= 0) throw std::runtime_error("Failed to format font size");
scratch.resize(num);
set_text(scratch);
set_ascii_text(txt, num);
return true;
}