More text changes

src/Engine/Asset/FontAsset.cpp

@@ -6,35 +6,61 @@ using namespace Seele;
 
 FontAsset::FontAsset() {}
 
-FontAsset::FontAsset(std::string_view folderPath, std::string_view name) : Asset(folderPath, name) {}
-
-FontAsset::~FontAsset() {}
-
-void FontAsset::save(ArchiveBuffer& buffer) const { Serialization::save(buffer, glyphs); }
-
-void FontAsset::load(ArchiveBuffer& buffer) { Serialization::load(buffer, glyphs); }
-
-void FontAsset::Glyph::save(ArchiveBuffer& buffer) const {
-    Serialization::save(buffer, size);
-    Serialization::save(buffer, bearing);
-    Serialization::save(buffer, advance);
-    Serialization::save(buffer, textureData);
+FontAsset::FontAsset(std::string_view folderPath, std::string_view name) : Asset(folderPath, name) {
+    FT_Error error = FT_Init_FreeType(&ft);
+    assert(!error);
 }
 
-void FontAsset::Glyph::load(ArchiveBuffer& buffer) {
-    Serialization::load(buffer, size);
-    Serialization::load(buffer, bearing);
-    Serialization::load(buffer, advance);
-    Serialization::load(buffer, textureData);
-    texture = buffer.getGraphics()->createTexture2D(TextureCreateInfo{
-        .sourceData =
-            {
-                .size = textureData.size(),
-                .data = textureData.data(),
-            },
-        .format = Gfx::SE_FORMAT_R8_UNORM,
-        .width = size.x,
-        .height = size.y,
-        .name = "FontGlyph",
-    });
+FontAsset::~FontAsset() {
+    FT_Done_Face(face);
+    FT_Done_FreeType(ft);
 }
+
+void FontAsset::save(ArchiveBuffer& buffer) const { Serialization::save(buffer, ttfFile); }
+
+void FontAsset::load(ArchiveBuffer& buffer) {
+    Serialization::load(buffer, ttfFile);
+    graphics = buffer.getGraphics();
+    loadFace();
+}
+
+void FontAsset::loadFace() {
+    FT_Error error = FT_New_Memory_Face(ft, ttfFile.data(), ttfFile.size(), 0, &face);
+    assert(!error);
+}
+
+void FontAsset::loadFontSize(uint32 fontSize) {
+    FT_Set_Pixel_Sizes(face, 0, fontSize);
+    fontSizes[fontSize].ascent = face->ascender;
+    fontSizes[fontSize].descent = face->descender;
+    fontSizes[fontSize].linegap = 0;
+    for (uint32 c = 0; c < 256; ++c) {
+        if (FT_Load_Char(face, c, FT_LOAD_RENDER | FT_LOAD_COLOR)) {
+            continue;
+        }
+        FontAsset::Glyph& glyph = fontSizes[fontSize].glyphs[c];
+        glyph.size = IVector2(face->glyph->bitmap.width, face->glyph->bitmap.rows);
+        glyph.bearing = IVector2(face->glyph->bitmap_left, face->glyph->bitmap_top);
+        glyph.advance = face->glyph->advance.x;
+        glyph.textureData.resize(glyph.size.x * glyph.size.y);
+        if (glyph.textureData.size() == 0) {
+            glyph.size.x = 1;
+            glyph.size.y = 1;
+            glyph.textureData.add(0);
+            // load a single transparent pixel, so that we dont have to handle empty textures later
+        } else {
+            std::memcpy(glyph.textureData.data(), face->glyph->bitmap.buffer, glyph.textureData.size());
+        }
+        glyph.texture = graphics->createTexture2D(TextureCreateInfo{
+            .sourceData =
+                {
+                    .size = glyph.textureData.size(),
+                    .data = glyph.textureData.data(),
+                },
+            .format = Gfx::SE_FORMAT_R8_UNORM,
+            .width = glyph.size.x,
+            .height = glyph.size.y,
+            .name = "FontGlyph",
+        });
+    }
+}