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RTL fixes from TWiLight

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This commit is contained in:
Pk11
2021-01-20 13:55:44 -06:00
parent 3af2a29cfe
commit 1588a4254b
2 changed files with 31 additions and 28 deletions
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source/font.cpp
+24 -21
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@@ -183,7 +183,16 @@ int Font::calcWidth(std::u16string_view text) {
}
ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int layer, Alignment align, int maxWidth,
int color, float scaleX, float scaleY, Sprite *sprite) {
int color, float scaleX, float scaleY, bool rtl, Sprite *sprite) {
// If RTL isn't forced, check for RTL text
for(const auto c : text) {
if(c >= 0x0590 && c <= 0x05FF) {
rtl = true;
break;
}
}
auto ltrBegin = text.end(), ltrEnd = text.end();
// Adjust x for alignment
switch(align) {
case Alignment::left: {
@@ -192,7 +201,7 @@ ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int
case Alignment::center: {
size_t newline = text.find('\n');
while(newline != text.npos) {
print(text.substr(0, newline), x, y, top, layer, align, maxWidth, color, scaleX, scaleY, sprite);
print(text.substr(0, newline), x, y, top, layer, align, maxWidth, color, scaleX, scaleY, rtl, sprite);
text = text.substr(newline + 1);
newline = text.find('\n');
y += tileHeight;
@@ -205,7 +214,7 @@ ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int
size_t newline = text.find('\n');
while(newline != text.npos) {
print(text.substr(0, newline), x - (calcWidth(text.substr(0, newline)) * scaleX), y, top, layer,
Alignment::left, maxWidth, color, scaleX, scaleY, sprite);
Alignment::left, maxWidth, color, scaleX, scaleY, rtl, sprite);
text = text.substr(newline + 1);
newline = text.find('\n');
y += tileHeight;
@@ -219,21 +228,12 @@ ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int
if(maxWidth != 0)
scaleX = std::min(scaleX, (float)maxWidth / (calcWidth(text) * scaleX));
bool rtl = false;
for(const auto c : text) {
if(c >= 0x0590 && c <= 0x05FF) {
rtl = true;
break;
}
}
auto ltrBegin = text.end(), ltrEnd = text.end();
// Loop through string and print it
for(auto it = (rtl ? text.end() - 1 : text.begin()); true; it += (rtl ? -1 : 1)) {
// If we hit the end of the string in an LTR section of an RTL
// string, it may not be done, if so jump back to printing RTL
if(it == (rtl ? text.begin() - 1 : text.end())) {
if(ltrBegin == text.end()) {
if(ltrBegin == text.end() || (ltrBegin == text.begin() && ltrEnd == text.end())) {
break;
} else {
it = ltrBegin;
@@ -242,7 +242,7 @@ ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int
}
}
// If at the end of an LRT section within RTL, jump back to the RTL
// If at the end of an LTR section within RTL, jump back to the RTL
if(it == ltrEnd && ltrBegin != text.end()) {
if(ltrBegin == text.begin())
break;
@@ -257,19 +257,22 @@ ITCM_CODE void Font::print(std::u16string_view text, int x, int y, bool top, int
*it >= 127))) {
// Save where we are as the end of the LTR section
ltrEnd = it + 1;
// Go back until an RTL character or the start of the string
while((*it < 0x0590 || *it > 0x05FF) && it != text.begin())
it--;
// Save where we are to return to after printing the LTR section
ltrBegin = it;
// If not at the start, then we're on the first RTL right now, so add one
if(it != text.begin())
// If on an RTL char right now, add one
if(*it >= 0x0590 && *it <= 0x05FF) {
it++;
// Skip all punctuation at the end if not at beginning
while(it != text.begin() &&
(*it < '0' || (*it > '9' && *it < 'A') || (*it > 'Z' && *it < 'a') || (*it > 'z' && *it < 127))) {
it++;
ltrBegin++;
// And skip all punctuation at the end if not at beginning
while(*it < '0' || (*it > '9' && *it < 'A') || (*it > 'Z' && *it < 'a') || (*it > 'z' && *it < 127)) {
it++;
ltrBegin++;
}
}
rtl = false;
}