Add Text rendering

- Add FreeType as dependency - Add MsdfGen as dependency - Add MsdfAtlasGen as dependency
2023-05-08 22:12:19 +02:00
parent ad69293faa
commit 4e466a1fce
190 changed files with 44693 additions and 46 deletions
@@ -0,0 +1,78 @@
+
+#include "DynamicAtlas.h"
+
+namespace msdf_atlas {
+
+template <class AtlasGenerator>
+DynamicAtlas<AtlasGenerator>::DynamicAtlas() : glyphCount(0), side(0), totalArea(0), padding(0) { }
+
+template <class AtlasGenerator>
+DynamicAtlas<AtlasGenerator>::DynamicAtlas(AtlasGenerator &&generator) : generator((AtlasGenerator &&) generator), glyphCount(0), side(0), totalArea(0), padding(0) { }
+
+template <class AtlasGenerator>
+typename DynamicAtlas<AtlasGenerator>::ChangeFlags DynamicAtlas<AtlasGenerator>::add(GlyphGeometry *glyphs, int count, bool allowRearrange) {
+    ChangeFlags changeFlags = 0;
+    int start = rectangles.size();
+    for (int i = 0; i < count; ++i) {
+        if (!glyphs[i].isWhitespace()) {
+            int w, h;
+            glyphs[i].getBoxSize(w, h);
+            Rectangle rect = { 0, 0, w+padding, h+padding };
+            rectangles.push_back(rect);
+            Remap remapEntry = { };
+            remapEntry.index = glyphCount+i;
+            remapEntry.width = w;
+            remapEntry.height = h;
+            remapBuffer.push_back(remapEntry);
+            totalArea += (w+padding)*(h+padding);
+        }
+    }
+    if ((int) rectangles.size() > start) {
+        int packerStart = start;
+        int remaining;
+        while ((remaining = packer.pack(rectangles.data()+packerStart, rectangles.size()-packerStart)) > 0) {
+            side = (side+!side)<<1;
+            while (side*side < totalArea)
+                side <<= 1;
+            if (allowRearrange) {
+                packer = RectanglePacker(side+padding, side+padding);
+                packerStart = 0;
+            } else {
+                packer.expand(side+padding, side+padding);
+                packerStart = rectangles.size()-remaining;
+            }
+            changeFlags |= RESIZED;
+        }
+        if (packerStart < start) {
+            for (int i = packerStart; i < start; ++i) {
+                Remap &remap = remapBuffer[i];
+                remap.source = remap.target;
+                remap.target.x = rectangles[i].x;
+                remap.target.y = rectangles[i].y;
+            }
+            generator.rearrange(side, side, remapBuffer.data(), start);
+            changeFlags |= REARRANGED;
+        } else if (changeFlags&RESIZED)
+            generator.resize(side, side);
+        for (int i = start; i < (int) rectangles.size(); ++i) {
+            remapBuffer[i].target.x = rectangles[i].x;
+            remapBuffer[i].target.y = rectangles[i].y;
+            glyphs[remapBuffer[i].index-glyphCount].placeBox(rectangles[i].x, rectangles[i].y);
+        }
+    }
+    generator.generate(glyphs, count);
+    glyphCount += count;
+    return changeFlags;
+}
+
+template <class AtlasGenerator>
+AtlasGenerator & DynamicAtlas<AtlasGenerator>::atlasGenerator() {
+    return generator;
+}
+
+template <class AtlasGenerator>
+const AtlasGenerator & DynamicAtlas<AtlasGenerator>::atlasGenerator() const {
+    return generator;
+}
+
+}