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implementations/Crafter.Graphics-TextElement.cpp

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+/*
+Crafter®.Graphics
+Copyright (C) 2025 Catcrafts®
+Catcrafts.net
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3.0 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+*/
+
+module;
+#include "../lib/stb_truetype.h"
+module Crafter.Graphics:TextElement_impl;
+import :TextElement;
+import :RenderingElement;
+import :Window;
+import :Types;
+import :Font;
+import std;
+
+using namespace Crafter;
+
+TextElement::TextElement() : RenderingElement() {
+
+}
+
+TextElement::TextElement(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 pixel, Font& font, 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) : RenderingElement(anchorX, anchorY, relativeWidth, relativeHeight, anchorOffsetX, anchorOffsetY, z, ignoreScaling) {
+    RenderText(text, size, pixel, font);
+}
+
+void TextElement::RenderText(const std::string_view text, float size, Pixel_BU8_GU8_RU8_AU8 color, Font& font) {
+    buffer.clear();
+
+    float scale = stbtt_ScaleForPixelHeight(&font.font, size);
+
+    int baseline = (int)(font.ascent * scale);
+
+    std::uint_fast32_t bufferWidth = 0;
+    for (const char c : text) {
+        int advance, lsb;
+        stbtt_GetCodepointHMetrics(&font.font, c, &advance, &lsb);
+        bufferWidth += (int)(advance * scale);
+    }
+
+    ResizeBuffer(bufferWidth, (font.ascent - font.descent) * scale);
+
+    int x = 0;
+    for (std::uint_fast32_t i = 0; i < text.size(); i++) {
+        int codepoint = text[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);
+
+        for (int j = 0; j < h; j++) {
+            for (int i = 0; i < w; i++) {
+                buffer[(baseline + j + c_y1) * bufferWidth + (x + i + c_x1)] = {color.r, color.g, color.b, bitmap[j * w + i]};
+            }
+        }
+
+        x += (int)(ax * scale);
+
+        if (i + 1 < text.size()) {
+            x += (int)stbtt_GetCodepointKernAdvance(&font.font, codepoint, text[i+1] * scale);
+        }
+    }
+}