369 lines
No EOL
15 KiB
C++
369 lines
No EOL
15 KiB
C++
/*
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Crafter®.Graphics
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Copyright (C) 2025 Catcrafts®
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Catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3.0 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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module;
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#include "../lib/stb_truetype.h"
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module Crafter.Graphics:TextElement_impl;
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import :TextElement;
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import :RenderingElement;
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import :Window;
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import :Types;
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import :Font;
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import std;
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using namespace Crafter;
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TextElement::TextElement(std::int_fast32_t anchorX, std::int_fast32_t anchorY, std::uint_fast32_t relativeWidth, std::uint_fast32_t relativeHeight, std::int_fast32_t anchorOffsetX, std::int_fast32_t anchorOffsetY, std::int_fast32_t z, bool ignoreScaling) : RenderingElementPreScaled(false, anchorX, anchorY, relativeWidth, relativeHeight, anchorOffsetX, anchorOffsetY, z, ignoreScaling) {
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}
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void TextElement::RenderText(Window& window, const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font, TextAlignment alignment, VerticalTextAlignment verticalAlignment, TextOverflowMode overflowMode) {
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window.AddDirtyRect(scaled);
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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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// 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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// 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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// Handle text overflow based on mode
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if (overflowMode == TextOverflowMode::Clip) {
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// 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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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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// Now process each line
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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 totalTextHeight = lines.size() * lineHeight;
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// Calculate vertical offset based on vertical alignment
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std::int_fast32_t verticalOffset = 0;
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switch (verticalAlignment) {
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case VerticalTextAlignment::Top:
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verticalOffset = 0;
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break;
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case VerticalTextAlignment::Middle:
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verticalOffset = (scaled.height - totalTextHeight) / 2;
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break;
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case VerticalTextAlignment::Bottom:
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verticalOffset = scaled.height - totalTextHeight;
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break;
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}
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std::uint_fast32_t currentLineStartY = 0;
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for (std::size_t lineIndex = 0; lineIndex < lines.size(); ++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 = verticalOffset + 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 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 < 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 if (overflowMode == TextOverflowMode::Wrap) {
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// Implement word 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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// Process text character by character to wrap words
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std::string remaining(text);
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std::string currentLine;
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std::string lastWord;
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std::string currentWord;
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while (!remaining.empty()) {
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// Find next word boundary
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std::size_t nextSpace = remaining.find(' ');
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std::size_t nextNewline = remaining.find('\n');
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// Find the earliest delimiter
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std::size_t delimiterPos = std::string_view::npos;
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if (nextSpace != std::string_view::npos) {
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delimiterPos = nextSpace;
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}
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if (nextNewline != std::string_view::npos && (delimiterPos == std::string_view::npos || nextNewline < delimiterPos)) {
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delimiterPos = nextNewline;
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}
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// Extract word
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if (delimiterPos != std::string_view::npos) {
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currentWord = remaining.substr(0, delimiterPos);
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remaining = remaining.substr(delimiterPos + 1);
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} else {
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currentWord = remaining;
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remaining = {};
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}
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// Check if adding this word would exceed the line width
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std::uint_fast32_t wordWidth = 0;
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for (const char c : currentWord) {
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int advance, lsb;
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stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
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wordWidth += (int)(advance * scale);
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}
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// Add kerning for spaces between words
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if (!currentLine.empty() && !currentWord.empty()) {
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int lastChar = currentLine.back();
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int firstChar = currentWord.front();
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wordWidth += (int)stbtt_GetCodepointKernAdvance(&font.font, lastChar, firstChar);
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}
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// If this word alone is wider than the line, force break it
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if (wordWidth > maxLineWidth) {
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// Force break the word
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if (!currentLine.empty()) {
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// Render current line
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RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
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currentLineStartY += lineHeight;
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currentLine = {};
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}
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// Break the long word into parts
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std::string_view wordPart = currentWord;
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while (!wordPart.empty()) {
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// Find a good place to break the word
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std::size_t breakPos = 0;
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std::uint_fast32_t currentWidth = 0;
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for (std::size_t i = 0; i < wordPart.length(); ++i) {
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int advance, lsb;
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stbtt_GetCodepointHMetrics(&font.font, wordPart[i], &advance, &lsb);
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currentWidth += (int)(advance * scale);
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if (currentWidth > maxLineWidth) {
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breakPos = i;
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break;
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}
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}
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if (breakPos == 0) {
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breakPos = wordPart.length();
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}
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std::string_view part = wordPart.substr(0, breakPos);
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// Render the part
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RenderWrappedLine(part, scale, baseline, currentLineStartY, color, font, alignment);
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currentLineStartY += lineHeight;
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wordPart = wordPart.substr(breakPos);
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}
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} else if (currentLine.empty() || (currentLine.length() + currentWord.length() + 1) * (int)(scale * 1.5f) <= maxLineWidth) {
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// Add word to current line
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if (!currentLine.empty()) {
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currentLine = currentLine.substr(0) + std::string(" ") + currentWord;
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} else {
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currentLine = currentWord;
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}
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} else {
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// Render current line and start new one
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RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
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currentLineStartY += lineHeight;
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currentLine = currentWord;
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}
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}
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// Render final line if it exists
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if (!currentLine.empty()) {
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RenderWrappedLine(currentLine, scale, baseline, currentLineStartY, color, font, alignment);
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}
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// Apply vertical alignment to the entire wrapped text
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std::uint_fast32_t totalTextHeight = (currentLineStartY + lineHeight); // Total height including last line
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// Calculate vertical offset based on vertical alignment
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std::int_fast32_t verticalOffset = 0;
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switch (verticalAlignment) {
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case VerticalTextAlignment::Top:
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verticalOffset = 0;
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break;
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case VerticalTextAlignment::Middle:
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verticalOffset = (scaled.height - totalTextHeight) / 2;
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break;
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case VerticalTextAlignment::Bottom:
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verticalOffset = scaled.height - totalTextHeight;
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break;
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}
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// Shift all rendered content vertically
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if (verticalOffset != 0) {
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for (std::uint_fast32_t y = 0; y < scaled.height; ++y) {
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for (std::uint_fast32_t x = 0; x < scaled.width; ++x) {
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std::uint_fast32_t index = y * scaled.width + x;
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if (index < bufferScaled.size()) {
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// Move the pixel vertically
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std::uint_fast32_t newIndex = (y + verticalOffset) * scaled.width + x;
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if (newIndex < bufferScaled.size()) {
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bufferScaled[newIndex] = bufferScaled[index];
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}
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}
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}
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}
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}
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}
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}
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// Helper method to render a wrapped line
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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) {
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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 currentY = startY + baseline;
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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 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 = currentY + 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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} |