osb/source/rendering/StarTextPainter.cpp
2024-04-04 15:09:40 +11:00

515 lines
16 KiB
C++

#include "StarTextPainter.hpp"
#include "StarJsonExtra.hpp"
#include "StarText.hpp"
#include <regex>
namespace Star {
TextPositioning::TextPositioning() {
pos = Vec2F();
hAnchor = HorizontalAnchor::LeftAnchor;
vAnchor = VerticalAnchor::BottomAnchor;
}
TextPositioning::TextPositioning(Vec2F pos, HorizontalAnchor hAnchor, VerticalAnchor vAnchor,
Maybe<unsigned> wrapWidth, Maybe<unsigned> charLimit)
: pos(pos), hAnchor(hAnchor), vAnchor(vAnchor), wrapWidth(wrapWidth), charLimit(charLimit) {}
TextPositioning::TextPositioning(Json const& v) {
pos = v.opt("position").apply(jsonToVec2F).value();
hAnchor = HorizontalAnchorNames.getLeft(v.getString("horizontalAnchor", "left"));
vAnchor = VerticalAnchorNames.getLeft(v.getString("verticalAnchor", "top"));
wrapWidth = v.optUInt("wrapWidth");
charLimit = v.optUInt("charLimit");
}
Json TextPositioning::toJson() const {
return JsonObject{
{"position", jsonFromVec2F(pos)},
{"horizontalAnchor", HorizontalAnchorNames.getRight(hAnchor)},
{"verticalAnchor", VerticalAnchorNames.getRight(vAnchor)},
{"wrapWidth", jsonFromMaybe(wrapWidth)}
};
}
TextPositioning TextPositioning::translated(Vec2F translation) const {
return {pos + translation, hAnchor, vAnchor, wrapWidth, charLimit};
}
TextPainter::TextPainter(RendererPtr renderer, TextureGroupPtr textureGroup)
: m_renderer(renderer),
m_fontTextureGroup(textureGroup),
m_fontSize(8),
m_lineSpacing(1.30f),
m_renderSettings({FontMode::Normal, Vec4B::filled(255), "hobo", ""}) {
reloadFonts();
m_reloadTracker = make_shared<TrackerListener>();
Root::singleton().registerReloadListener(m_reloadTracker);
}
RectF TextPainter::renderText(StringView s, TextPositioning const& position) {
if (position.charLimit) {
unsigned charLimit = *position.charLimit;
return doRenderText(s, position, true, &charLimit);
} else {
return doRenderText(s, position, true, nullptr);
}
}
RectF TextPainter::renderLine(StringView s, TextPositioning const& position) {
if (position.charLimit) {
unsigned charLimit = *position.charLimit;
return doRenderLine(s, position, true, &charLimit);
} else {
return doRenderLine(s, position, true, nullptr);
}
}
RectF TextPainter::renderGlyph(String::Char c, TextPositioning const& position) {
return doRenderGlyph(c, position, true);
}
RectF TextPainter::determineTextSize(StringView s, TextPositioning const& position) {
return doRenderText(s, position, false, nullptr);
}
RectF TextPainter::determineLineSize(StringView s, TextPositioning const& position) {
return doRenderLine(s, position, false, nullptr);
}
RectF TextPainter::determineGlyphSize(String::Char c, TextPositioning const& position) {
return doRenderGlyph(c, position, false);
}
int TextPainter::glyphWidth(String::Char c) {
return m_fontTextureGroup.glyphWidth(c, m_fontSize);
}
int TextPainter::stringWidth(StringView s) {
if (s.empty())
return 0;
String font = m_renderSettings.font, setFont = font;
m_fontTextureGroup.switchFont(font);
int width = 0;
Text::CommandsCallback commandsCallback = [&](StringView commands) {
commands.forEachSplitView(",", [&](StringView command, size_t, size_t) {
if (command == "reset")
m_fontTextureGroup.switchFont(font = setFont);
else if (command == "set")
setFont = font;
else if (command.beginsWith("font="))
m_fontTextureGroup.switchFont(font = command.substr(5));
});
return true;
};
Text::TextCallback textCallback = [&](StringView text) {
for (String::Char c : text)
width += glyphWidth(c);
return true;
};
Text::processText(s, textCallback, commandsCallback);
return width;
}
bool TextPainter::processWrapText(StringView text, unsigned* wrapWidth, WrapTextCallback textFunc) {
String font = m_renderSettings.font, setFont = font;
m_fontTextureGroup.switchFont(font);
int lines = 0;
auto it = text.begin();
auto end = text.end();
unsigned linePixelWidth = 0; // How wide is this line so far
unsigned lineCharSize = 0; // how many characters in this line ?
auto escIt = end;
unsigned splitWidth = 0; // How wide was the string there ?
auto lineStartIt = it; // Where does this line start ?
auto splitIt = end; // != end if we last saw a place to split the string
auto slice = [](StringView::const_iterator a, StringView::const_iterator b) -> StringView {
const char* aPtr = &*a.base();
return StringView(aPtr, &*b.base() - aPtr);
};
while (it != end) {
auto character = *it;
if (Text::isEscapeCode(character))
escIt = it;
if (escIt != end) {
if (character == Text::EndEsc) {
StringView inner = slice(escIt, it);
inner.forEachSplitView(",", [&](StringView command, size_t, size_t) {
if (command == "reset")
m_fontTextureGroup.switchFont(font = setFont);
else if (command == "set")
setFont = font;
else if (command.beginsWith("font="))
m_fontTextureGroup.switchFont(font = command.substr(5));
});
escIt = end;
}
lineCharSize++;
} else {
lineCharSize++; // assume at least one character if we get here.
// is this a linefeed / cr / whatever that forces a line split ?
if (character == '\n' || character == '\v') {
// knock one off the end because we don't render the CR
if (!textFunc(slice(lineStartIt, it), lines++))
return false;
lineStartIt = it;
++lineStartIt;
// next line starts after the CR with no characters in it and no known splits.
lineCharSize = linePixelWidth = 0;
} else {
int charWidth = glyphWidth(character);
// is it a place where we might want to split the line ?
if (character == ' ' || character == '\t') {
splitIt = it;
splitWidth = linePixelWidth + charWidth; // the width of the string at
// the split point, i.e. after the space.
}
// would the line be too long if we render this next character ?
if (wrapWidth && (linePixelWidth + charWidth) > *wrapWidth) {
// did we find somewhere to split the line ?
if (splitIt != end) {
if (!textFunc(slice(lineStartIt, splitIt), lines++))
return false;
unsigned stringWidth = linePixelWidth - splitWidth;
linePixelWidth = stringWidth + charWidth; // and is as wide as the bit after the space.
lineStartIt = ++splitIt;
splitIt = end;
} else {
if (!textFunc(slice(lineStartIt, it), lines++))
return false;
lineStartIt = it; // include that character on the next line.
lineCharSize = 1; // next line has that character in
linePixelWidth = charWidth; // and is as wide as that character
}
} else {
linePixelWidth += charWidth;
}
}
}
++it;
};
// if we hit the end of the string before hitting the end of the line.
if (lineCharSize > 0)
return textFunc(slice(lineStartIt, end), lines);
return true;
}
List<StringView> TextPainter::wrapTextViews(StringView s, Maybe<unsigned> wrapWidth) {
List<StringView> views = {};
bool active = false;
StringView current;
int lastLine = 0;
auto addText = [&active, &current](StringView text) {
// Merge views if they are adjacent
if (active && current.utf8Ptr() + current.utf8Size() == text.utf8Ptr())
current = StringView(current.utf8Ptr(), current.utf8Size() + text.utf8Size());
else
current = text;
active = true;
};
TextPainter::WrapTextCallback textCallback = [&](StringView text, int line) {
if (lastLine != line) {
views.push_back(current);
lastLine = line;
active = false;
}
addText(text);
return true;
};
processWrapText(s, wrapWidth.ptr(), textCallback);
if (active)
views.push_back(current);
return views;
}
StringList TextPainter::wrapText(StringView s, Maybe<unsigned> wrapWidth) {
StringList result;
String current;
int lastLine = 0;
TextPainter::WrapTextCallback textCallback = [&](StringView text, int line) {
if (lastLine != line) {
result.append(std::move(current));
lastLine = line;
}
current += text;
return true;
};
processWrapText(s, wrapWidth.ptr(), textCallback);
if (!current.empty())
result.append(std::move(current));
return result;
};
unsigned TextPainter::fontSize() const {
return m_fontSize;
}
void TextPainter::setFontSize(unsigned size) {
m_fontSize = size;
}
void TextPainter::setLineSpacing(float lineSpacing) {
m_lineSpacing = lineSpacing;
}
void TextPainter::setMode(FontMode mode) {
m_renderSettings.mode = mode;
}
void TextPainter::setFontColor(Vec4B color) {
m_renderSettings.color = std::move(color);
}
void TextPainter::setProcessingDirectives(StringView directives) {
m_renderSettings.directives = String(directives);
if (m_renderSettings.directives) {
m_renderSettings.directives.loadOperations();
for (auto& entry : m_renderSettings.directives.shared->entries) {
if (auto border = entry.operation.ptr<BorderImageOperation>())
border->includeTransparent = true;
}
}
}
void TextPainter::setFont(String const& font) {
m_renderSettings.font = font;
}
void TextPainter::addFont(FontPtr const& font, String const& name) {
m_fontTextureGroup.addFont(font, name);
}
void TextPainter::reloadFonts() {
m_fontTextureGroup.clearFonts();
m_fontTextureGroup.cleanup(0);
auto assets = Root::singleton().assets();
String defaultName = "hobo";
auto defaultFont = loadFont("/hobo.ttf", defaultName);
auto loadFontsByExtension = [&](String const& ext) {
for (auto& fontPath : assets->scanExtension(ext)) {
auto font = assets->font(fontPath);
if (font == defaultFont)
continue;
auto name = AssetPath::filename(fontPath);
name = name.substr(0, name.findLast("."));
addFont(loadFont(fontPath, name), name);
}
};
loadFontsByExtension("ttf");
loadFontsByExtension("woff2");
m_fontTextureGroup.addFont(defaultFont, defaultName, true);
}
void TextPainter::cleanup(int64_t timeout) {
m_fontTextureGroup.cleanup(timeout);
}
void TextPainter::applyCommands(StringView unsplitCommands) {
unsplitCommands.forEachSplitView(",", [&](StringView command, size_t, size_t) {
try {
if (command == "reset") {
m_renderSettings = m_savedRenderSettings;
} else if (command == "set") {
m_savedRenderSettings = m_renderSettings;
} else if (command == "shadow") {
m_renderSettings.mode = (FontMode)((int)m_renderSettings.mode | (int)FontMode::Shadow);
} else if (command == "noshadow") {
m_renderSettings.mode = (FontMode)((int)m_renderSettings.mode & (-1 ^ (int)FontMode::Shadow));
} else if (command.beginsWith("font=")) {
m_renderSettings.font = command.substr(5);
} else if (command.beginsWith("directives=")) {
// Honestly this is really stupid but I just couldn't help myself
// Should probably limit in the future
setProcessingDirectives(command.substr(11));
} else {
// expects both #... sequences and plain old color names.
Color c = Color(command);
c.setAlphaF(c.alphaF() * ((float)m_savedRenderSettings.color[3]) / 255);
m_renderSettings.color = c.toRgba();
}
} catch (JsonException&) {
} catch (ColorException&) {
}
});
}
RectF TextPainter::doRenderText(StringView s, TextPositioning const& position, bool reallyRender, unsigned* charLimit) {
Vec2F pos = position.pos;
if (s.empty())
return RectF(pos, pos);
List<StringView> lines = wrapTextViews(s, position.wrapWidth);
int height = (lines.size() - 1) * m_lineSpacing * m_fontSize + m_fontSize;
RenderSettings backupRenderSettings = m_renderSettings;
m_savedRenderSettings = m_renderSettings;
if (position.vAnchor == VerticalAnchor::BottomAnchor)
pos[1] += (height - m_fontSize);
else if (position.vAnchor == VerticalAnchor::VMidAnchor)
pos[1] += (height - m_fontSize) / 2;
RectF bounds = RectF::withSize(pos, Vec2F());
for (auto& i : lines) {
bounds.combine(doRenderLine(i, { pos, position.hAnchor, position.vAnchor }, reallyRender, charLimit));
pos[1] -= m_fontSize * m_lineSpacing;
if (charLimit && *charLimit == 0)
break;
}
m_renderSettings = std::move(backupRenderSettings);
return bounds;
}
RectF TextPainter::doRenderLine(StringView text, TextPositioning const& position, bool reallyRender, unsigned* charLimit) {
if (m_reloadTracker->pullTriggered())
reloadFonts();
TextPositioning pos = position;
if (pos.hAnchor == HorizontalAnchor::RightAnchor) {
StringView trimmedString = charLimit ? text.substr(0, *charLimit) : text;
pos.pos[0] -= stringWidth(trimmedString);
pos.hAnchor = HorizontalAnchor::LeftAnchor;
} else if (pos.hAnchor == HorizontalAnchor::HMidAnchor) {
StringView trimmedString = charLimit ? text.substr(0, *charLimit) : text;
pos.pos[0] -= floor((float)stringWidth(trimmedString) / 2);
pos.hAnchor = HorizontalAnchor::LeftAnchor;
}
String escapeCode;
RectF bounds = RectF::withSize(pos.pos, Vec2F());
Text::TextCallback textCallback = [&](StringView text) {
for (String::Char c : text) {
if (charLimit) {
if (*charLimit == 0)
return false;
else
--* charLimit;
}
RectF glyphBounds = doRenderGlyph(c, pos, reallyRender);
bounds.combine(glyphBounds);
pos.pos[0] += glyphBounds.width();
}
return true;
};
Text::CommandsCallback commandsCallback = [&](StringView commands) {
applyCommands(commands);
return true;
};
m_fontTextureGroup.switchFont(m_renderSettings.font);
Text::processText(text, textCallback, commandsCallback);
return bounds;
}
RectF TextPainter::doRenderGlyph(String::Char c, TextPositioning const& position, bool reallyRender) {
if (c == '\n' || c == '\v' || c == '\r')
return RectF();
m_fontTextureGroup.switchFont(m_renderSettings.font);
int width = glyphWidth(c);
// Offset left by width if right anchored.
float hOffset = 0;
if (position.hAnchor == HorizontalAnchor::RightAnchor)
hOffset = -width;
else if (position.hAnchor == HorizontalAnchor::HMidAnchor)
hOffset = -floor((float)width / 2);
float vOffset = 0;
if (position.vAnchor == VerticalAnchor::VMidAnchor)
vOffset = -floor((float)m_fontSize / 2);
else if (position.vAnchor == VerticalAnchor::TopAnchor)
vOffset = -(float)m_fontSize;
Directives* directives = m_renderSettings.directives ? &m_renderSettings.directives : nullptr;
if (reallyRender) {
if ((int)m_renderSettings.mode & (int)FontMode::Shadow) {
Color shadow = Color::Black;
uint8_t alphaU = m_renderSettings.color[3];
if (alphaU != 255) {
float alpha = byteToFloat(alphaU);
shadow.setAlpha(floatToByte(alpha * (1.5f - 0.5f * alpha)));
}
else
shadow.setAlpha(alphaU);
//Kae: Draw only one shadow glyph instead of stacking two, alpha modified to appear perceptually the same as vanilla
renderGlyph(c, position.pos + Vec2F(hOffset, vOffset - 2), m_fontSize, 1, shadow.toRgba(), directives);
}
renderGlyph(c, position.pos + Vec2F(hOffset, vOffset), m_fontSize, 1, m_renderSettings.color, directives);
}
return RectF::withSize(position.pos + Vec2F(hOffset, vOffset), {(float)width, (int)m_fontSize});
}
void TextPainter::renderGlyph(String::Char c, Vec2F const& screenPos, unsigned fontSize,
float scale, Vec4B const& color, Directives const* processingDirectives) {
if (!fontSize)
return;
const FontTextureGroup::GlyphTexture& glyphTexture = m_fontTextureGroup.glyphTexture(c, fontSize, processingDirectives);
Vec2F offset = glyphTexture.offset * scale;
m_renderer->immediatePrimitives().emplace_back(std::in_place_type_t<RenderQuad>(), glyphTexture.texture, Vec2F::round(screenPos + offset), scale, color, 0.0f);
}
FontPtr TextPainter::loadFont(String const& fontPath, Maybe<String> fontName) {
if (!fontName) {
auto name = AssetPath::filename(fontPath);
fontName.emplace(name.substr(0, name.findLast(".")));
}
auto assets = Root::singleton().assets();
auto font = assets->font(fontPath)->clone();
if (auto fontConfig = assets->json("/interface.config:font").opt(*fontName)) {
font->setAlphaThreshold(fontConfig->getUInt("alphaThreshold", 0));
}
return font;
}
}