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This commit is contained in:
Jorijn van der Graaf 2025-11-26 04:06:05 +01:00
commit f714212d2f
2 changed files with 177 additions and 18 deletions
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193
implementations/Crafter.Graphics-TextElement.cpp
View file

@ -49,26 +49,12 @@ void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_
return;
}
// Calculate total text width
std::uint_fast32_t totalTextWidth = 0;
std::vector<int> charAdvances;
std::vector<int> charLSBs;
for (const char c : text) {
int advance, lsb;
stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
charAdvances.push_back(advance);
charLSBs.push_back(lsb);
totalTextWidth += (int)(advance * scale);
}
// Handle text overflow based on mode
if (overflowMode == TextOverflowMode::Clip) {
// For wrapped text, we need to handle line breaks and calculate lines
// We need to handle line breaks and calculate lines
std::vector<std::string_view> lines;
std::string_view remaining = text;
// Simple word wrapping approach
while (!remaining.empty()) {
// Find next newline or end of string
auto newlinePos = remaining.find('\n');
@ -81,12 +67,11 @@ void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_
}
}
// Now process each line with proper wrapping
// Now process each line
std::uint_fast32_t lineHeight = (font.ascent - font.descent) * scale;
std::uint_fast32_t maxLineWidth = scaled.width;
std::uint_fast32_t currentLineStartY = 0;
// Process lines up to maximum allowed
for (std::size_t lineIndex = 0; lineIndex < lines.size(); ++lineIndex) {
std::string_view line = lines[lineIndex];
@ -156,7 +141,179 @@ void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_
currentLineStartY += lineHeight;
}
} else {
} else if (overflowMode == TextOverflowMode::Wrap) {
// Implement word wrapping
std::uint_fast32_t lineHeight = (font.ascent - font.descent) * scale;
std::uint_fast32_t maxLineWidth = scaled.width;
std::uint_fast32_t currentLineStartY = 0;
// Process text character by character to wrap words
std::string remaining(text);
std::string currentLine;
std::string lastWord;
std::string currentWord;
while (!remaining.empty()) {
// Find next word boundary
std::size_t nextSpace = remaining.find(' ');
std::size_t nextNewline = remaining.find('\n');
// Find the earliest delimiter
std::size_t delimiterPos = std::string_view::npos;
if (nextSpace != std::string_view::npos) {
delimiterPos = nextSpace;
}
if (nextNewline != std::string_view::npos && (delimiterPos == std::string_view::npos || nextNewline < delimiterPos)) {
delimiterPos = nextNewline;
}
// Extract word
if (delimiterPos != std::string_view::npos) {
currentWord = remaining.substr(0, delimiterPos);
remaining = remaining.substr(delimiterPos + 1);
} else {
currentWord = remaining;
remaining = {};
}
// Check if adding this word would exceed the line width
std::uint_fast32_t wordWidth = 0;
for (const char c : currentWord) {
int advance, lsb;
stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
wordWidth += (int)(advance * scale);
}
// Add kerning for spaces between words
if (!currentLine.empty() && !currentWord.empty()) {
int lastChar = currentLine.back();
int firstChar = currentWord.front();
wordWidth += (int)stbtt_GetCodepointKernAdvance(&font.font, lastChar, firstChar);
}
// If this word alone is wider than the line, force break it
if (wordWidth > maxLineWidth) {
// Force break the word
if (!currentLine.empty()) {
// Render current line
RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
currentLineStartY += lineHeight;
currentLine = {};
}
// Break the long word into parts
std::string_view wordPart = currentWord;
while (!wordPart.empty()) {
// Find a good place to break the word
std::size_t breakPos = 0;
std::uint_fast32_t currentWidth = 0;
for (std::size_t i = 0; i < wordPart.length(); ++i) {
int advance, lsb;
stbtt_GetCodepointHMetrics(&font.font, wordPart[i], &advance, &lsb);
currentWidth += (int)(advance * scale);
if (currentWidth > maxLineWidth) {
breakPos = i;
break;
}
}
if (breakPos == 0) {
breakPos = wordPart.length();
}
std::string_view part = wordPart.substr(0, breakPos);
// Render the part
RenderWrappedLine(part, scale, baseline, currentLineStartY, color, font, alignment);
currentLineStartY += lineHeight;
wordPart = wordPart.substr(breakPos);
}
} else if (currentLine.empty() || (currentLine.length() + currentWord.length() + 1) * (int)(scale * 1.5f) <= maxLineWidth) {
// Add word to current line
if (!currentLine.empty()) {
currentLine = currentLine.substr(0) + std::string(" ") + currentWord;
} else {
currentLine = currentWord;
}
} else {
// Render current line and start new one
RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
currentLineStartY += lineHeight;
currentLine = currentWord;
}
}
// Render final line if it exists
if (!currentLine.empty()) {
RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
}
}
}
// Helper method to render a wrapped line
void TextElement::RenderWrappedLine(const std::string_view line, float scale, int baseline, std::uint_fast32_t startY, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment) {
// Calculate line width
std::uint_fast32_t lineWidth = 0;
std::vector<int> lineAdvances;
for (const char c : line) {
int advance, lsb;
stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
lineAdvances.push_back(advance);
lineWidth += (int)(advance * scale);
}
// Determine horizontal position based on alignment
int startX = 0;
switch (alignment) {
case TextAlignment::Left:
startX = 0;
break;
case TextAlignment::Center:
startX = (scaled.width - lineWidth) / 2;
break;
case TextAlignment::Right:
startX = scaled.width - lineWidth;
break;
}
// Render the line
int x = startX;
int currentY = startY + baseline;
for (std::size_t i = 0; i < line.size(); ++i) {
int codepoint = line[i];
int ax;
int lsb;
stbtt_GetCodepointHMetrics(&font.font, codepoint, &ax, &lsb);
int c_x1, c_y1, c_x2, c_y2;
stbtt_GetCodepointBitmapBox(&font.font, codepoint, scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
int w = c_x2 - c_x1;
int h = c_y2 - c_y1;
std::vector<unsigned char> bitmap(w * h);
stbtt_MakeCodepointBitmap(&font.font, bitmap.data(), w, h, w, scale, scale, codepoint);
// Only render characters that fit within the scaled bounds
for (int j = 0; j < h; j++) {
for (int i = 0; i < w; i++) {
int bufferX = x + i + c_x1;
int bufferY = currentY + j + c_y1;
// Only draw pixels that are within our scaled buffer bounds
if (bufferX >= 0 && bufferX < (int)scaled.width && bufferY >= 0 && bufferY < (int)scaled.height) {
bufferScaled[bufferY * scaled.width + bufferX] = {color.r, color.g, color.b, bitmap[j * w + i]};
}
}
}
x += (int)(ax * scale);
if (i + 1 < line.size()) {
x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, line[i+1]);
}
}
}

2
interfaces/Crafter.Graphics-TextElement.cppm
View file

@ -36,6 +36,8 @@ export namespace Crafter {
};
class TextElement : public RenderingElementPreScaled {
private:
void RenderWrappedLine(const std::string_view line, float scale, int baseline, std::uint_fast32_t startY, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment);
public:
TextElement(std::int_fast32_t anchorX = FractionalToMapped(0.5), std::int_fast32_t anchorY = FractionalToMapped(0.5), std::uint_fast32_t relativeWidth = FractionalToMapped(1), std::uint_fast32_t relativeHeight = FractionalToMapped(1), std::int_fast32_t anchorOffsetX = FractionalToMapped(0.5), std::int_fast32_t anchorOffsetY = FractionalToMapped(0.5), std::int_fast32_t z = 0, bool ignoreScaling = false);
void RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 pixel, Font& font, TextAlignment alignment = TextAlignment::Left, TextOverflowMode overflowMode = TextOverflowMode::Clip);