text wrap
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d5ee272290
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2 changed files with 235 additions and 39 deletions
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@ -34,64 +34,249 @@ TextElement::TextElement(std::int_fast32_t anchorX, std::int_fast32_t anchorY, s
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}
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void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font) {
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void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment, TextOverflowMode overflowMode) {
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// Calculate the actual size needed for the text
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float scale = stbtt_ScaleForPixelHeight(&font.font, size);
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int baseline = (int)(font.ascent * scale);
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std::uint_fast32_t textWidth = 0;
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for (const char c : text) {
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int advance, lsb;
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stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
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textWidth += (int)(advance * scale);
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}
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// Clear the scaled buffer
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for (auto& pixel : bufferScaled) {
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pixel = {0, 0, 0, 0};
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}
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// Only render text if we have space
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if (textWidth <= scaled.width && (font.ascent - font.descent) * scale <= scaled.height) {
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// Calculate starting position to center text horizontally and vertically
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int startX = (scaled.width - textWidth) / 2;
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int startY = ( scaled.height - (font.ascent - font.descent) * scale) / 2;
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startY += baseline; // Adjust for baseline
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// If we have no text or no space, return early
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if (text.empty() || scaled.width == 0 || scaled.height == 0) {
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return;
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}
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// Calculate total text width
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std::uint_fast32_t totalTextWidth = 0;
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std::vector<int> charAdvances;
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std::vector<int> charLSBs;
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for (const char c : text) {
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int advance, lsb;
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stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
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charAdvances.push_back(advance);
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charLSBs.push_back(lsb);
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totalTextWidth += (int)(advance * scale);
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}
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// Handle text overflow based on mode
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if (overflowMode == TextOverflowMode::Wrap) {
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// For wrapped text, we need to handle line breaks and calculate lines
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std::vector<std::string_view> lines;
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std::string_view remaining = text;
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int x = startX;
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for (std::uint_fast32_t i = 0; i < text.size(); i++) {
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int codepoint = text[i];
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// Simple word wrapping approach
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while (!remaining.empty()) {
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// Find next newline or end of string
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auto newlinePos = remaining.find('\n');
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if (newlinePos != std::string_view::npos) {
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lines.emplace_back(remaining.substr(0, newlinePos));
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remaining = remaining.substr(newlinePos + 1);
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} else {
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lines.emplace_back(remaining);
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break;
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}
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}
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int ax;
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int lsb;
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stbtt_GetCodepointHMetrics(&font.font, codepoint, &ax, &lsb);
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// Now process each line with proper wrapping
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std::uint_fast32_t lineHeight = (font.ascent - font.descent) * scale;
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std::uint_fast32_t maxLineWidth = scaled.width;
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std::uint_fast32_t currentLineStartY = 0;
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std::uint_fast32_t maxLines = scaled.height / lineHeight;
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// Process lines up to maximum allowed
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for (std::size_t lineIndex = 0; lineIndex < std::min(lines.size(), maxLines); ++lineIndex) {
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std::string_view line = lines[lineIndex];
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// Calculate line width
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std::uint_fast32_t lineWidth = 0;
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std::vector<int> lineAdvances;
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for (const char c : line) {
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int advance, lsb;
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stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
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lineAdvances.push_back(advance);
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lineWidth += (int)(advance * scale);
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}
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// Determine horizontal position based on alignment
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int startX = 0;
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switch (alignment) {
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case TextAlignment::Left:
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startX = 0;
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break;
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case TextAlignment::Center:
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startX = (scaled.width - lineWidth) / 2;
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break;
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case TextAlignment::Right:
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startX = scaled.width - lineWidth;
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break;
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}
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// Render the line
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int x = startX;
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int startY = currentLineStartY + baseline + (lineIndex * lineHeight);
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for (std::size_t i = 0; i < line.size(); ++i) {
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int codepoint = line[i];
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int ax;
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int lsb;
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stbtt_GetCodepointHMetrics(&font.font, codepoint, &ax, &lsb);
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int c_x1, c_y1, c_x2, c_y2;
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stbtt_GetCodepointBitmapBox(&font.font, codepoint, scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
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int c_x1, c_y1, c_x2, c_y2;
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stbtt_GetCodepointBitmapBox(&font.font, codepoint, scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
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int w = c_x2 - c_x1;
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int h = c_y2 - c_y1;
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int w = c_x2 - c_x1;
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int h = c_y2 - c_y1;
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std::vector<unsigned char> bitmap(w * h);
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stbtt_MakeCodepointBitmap(&font.font, bitmap.data(), w, h, w, scale, scale, codepoint);
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std::vector<unsigned char> bitmap(w * h);
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stbtt_MakeCodepointBitmap(&font.font, bitmap.data(), w, h, w, scale, scale, codepoint);
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// Only render characters that fit within the scaled bounds
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for (int j = 0; j < h; j++) {
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for (int i = 0; i < w; i++) {
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int bufferX = x + i + c_x1;
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int bufferY = startY + j + c_y1;
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// Only draw pixels that are within our scaled buffer bounds
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if (bufferX >= 0 && bufferX < (int)scaled.width && bufferY >= 0 && bufferY < (int) scaled.height) {
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bufferScaled[bufferY * scaled.width + bufferX] = {color.r, color.g, color.b, bitmap[j * w + i]};
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// Only render characters that fit within the scaled bounds
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for (int j = 0; j < h; j++) {
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for (int i = 0; i < w; i++) {
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int bufferX = x + i + c_x1;
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int bufferY = startY + j + c_y1;
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// Only draw pixels that are within our scaled buffer bounds
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if (bufferX >= 0 && bufferX < (int)scaled.width && bufferY >= 0 && bufferY < (int)scaled.height) {
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bufferScaled[bufferY * scaled.width + bufferX] = {color.r, color.g, color.b, bitmap[j * w + i]};
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}
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}
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}
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x += (int)(ax * scale);
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if (i + 1 < line.size()) {
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x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, line[i+1]);
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}
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}
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currentLineStartY += lineHeight;
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}
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} else {
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// Clip mode - render text that fits within bounds
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// If the text fits entirely, render it normally
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if (totalTextWidth <= scaled.width && (font.ascent - font.descent) * scale <= scaled.height) {
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// Calculate starting position based on alignment
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int startX = 0;
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switch (alignment) {
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case TextAlignment::Left:
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startX = 0;
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break;
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case TextAlignment::Center:
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startX = (scaled.width - totalTextWidth) / 2;
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break;
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case TextAlignment::Right:
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startX = scaled.width - totalTextWidth;
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break;
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}
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int startY = (scaled.height - (font.ascent - font.descent) * scale) / 2;
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startY += baseline; // Adjust for baseline
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int x = startX;
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for (std::uint_fast32_t i = 0; i < text.size(); i++) {
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int codepoint = text[i];
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x += (int)(ax * scale);
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int ax;
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int lsb;
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stbtt_GetCodepointHMetrics(&font.font, codepoint, &ax, &lsb);
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if (i + 1 < text.size()) {
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x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, text[i+1] * scale);
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int c_x1, c_y1, c_x2, c_y2;
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stbtt_GetCodepointBitmapBox(&font.font, codepoint, scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
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int w = c_x2 - c_x1;
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int h = c_y2 - c_y1;
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std::vector<unsigned char> bitmap(w * h);
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stbtt_MakeCodepointBitmap(&font.font, bitmap.data(), w, h, w, scale, scale, codepoint);
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// Only render characters that fit within the scaled bounds
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for (int j = 0; j < h; j++) {
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for (int i = 0; i < w; i++) {
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int bufferX = x + i + c_x1;
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int bufferY = startY + j + c_y1;
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// Only draw pixels that are within our scaled buffer bounds
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if (bufferX >= 0 && bufferX < (int)scaled.width && bufferY >= 0 && bufferY < (int)scaled.height) {
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bufferScaled[bufferY * scaled.width + bufferX] = {color.r, color.g, color.b, bitmap[j * w + i]};
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}
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}
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}
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x += (int)(ax * scale);
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if (i + 1 < text.size()) {
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x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, text[i+1] * scale);
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}
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}
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} else {
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// Text doesn't fit, but we still render what we can
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// For now, we'll just render the first part that fits
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int startX = 0;
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switch (alignment) {
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case TextAlignment::Left:
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startX = 0;
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break;
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case TextAlignment::Center:
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startX = (scaled.width - totalTextWidth) / 2;
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break;
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case TextAlignment::Right:
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startX = scaled.width - totalTextWidth;
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break;
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}
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// Clamp to visible area
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int startY = (scaled.height - (font.ascent - font.descent) * scale) / 2;
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startY += baseline; // Adjust for baseline
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int x = startX;
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int renderedChars = 0;
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for (std::uint_fast32_t i = 0; i < text.size(); i++) {
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int codepoint = text[i];
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int ax;
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int lsb;
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stbtt_GetCodepointHMetrics(&font.font, codepoint, &ax, &lsb);
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int c_x1, c_y1, c_x2, c_y2;
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stbtt_GetCodepointBitmapBox(&font.font, codepoint, scale, scale, &c_x1, &c_y1, &c_x2, &c_y2);
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int w = c_x2 - c_x1;
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int h = c_y2 - c_y1;
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std::vector<unsigned char> bitmap(w * h);
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stbtt_MakeCodepointBitmap(&font.font, bitmap.data(), w, h, w, scale, scale, codepoint);
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// Only render characters that fit within the scaled bounds
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for (int j = 0; j < h; j++) {
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for (int i = 0; i < w; i++) {
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int bufferX = x + i + c_x1;
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int bufferY = startY + j + c_y1;
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// Only draw pixels that are within our scaled buffer bounds
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if (bufferX >= 0 && bufferX < (int)scaled.width && bufferY >= 0 && bufferY < (int)scaled.height) {
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bufferScaled[bufferY * scaled.width + bufferX] = {color.r, color.g, color.b, bitmap[j * w + i]};
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}
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}
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}
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x += (int)(ax * scale);
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if (x > (int)scaled.width) {
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// Text would overflow, stop rendering
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break;
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}
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if (i + 1 < text.size()) {
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x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, text[i+1] * scale);
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}
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renderedChars++;
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}
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}
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}
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