* text anchor

4 files changed, 75 insertions, 17 deletions

diff --git a/Runtime/GUI/Font.cpp b/Runtime/GUI/Font.cpp
index 1993126..4425b17 100644
--- a/Runtime/GUI/Font.cpp
+++ b/Runtime/GUI/Font.cpp
@@ -7,11 +7,14 @@
 
 using namespace character;
 
-//https://unicode-table.com/en/#cjk-unified-ideographs-extension-a
-//https://learnopengl.com/In-Practice/Text-Rendering
-//https://www.zhihu.com/question/294660079
-//https://baike.baidu.com/item/%E5%9F%BA%E6%9C%AC%E5%A4%9A%E6%96%87%E7%A7%8D%E5%B9%B3%E9%9D%A2/10788078
-//https://stackoverflow.com/questions/27331819/whats-the-difference-between-a-character-a-code-point-a-glyph-and-a-grapheme
+/*
+* http://madig.github.io/freetype-web/documentation/tutorial/
+* https://unicode-table.com/en/#cjk-unified-ideographs-extension-a
+* https://learnopengl.com/In-Practice/Text-Rendering
+* https://www.zhihu.com/question/294660079
+* https://baike.baidu.com/item/%E5%9F%BA%E6%9C%AC%E5%A4%9A%E6%96%87%E7%A7%8D%E5%B9%B3%E9%9D%A2/10788078
+* https://stackoverflow.com/questions/27331819/whats-the-difference-between-a-character-a-code-point-a-glyph-and-a-grapheme
+*/
 
 static std::string s_FontError;
 
@@ -161,7 +164,7 @@ bool Font::RenderCharacter(character::Unicode codepoint, int pixelSize)
 	int h = m_FTFace->glyph->bitmap.rows;
 	
     const unsigned char* pixels = m_FTFace->glyph->bitmap.buffer;
-    if (pixels != NULL) // 非空格
+    if (pixels != NULL) // 有些字体中space、tab没有字形的
     {
         s_PixelBuffer.resize(w * h);
         if (m_FTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO)
@@ -183,7 +186,7 @@ bool Font::RenderCharacter(character::Unicode codepoint, int pixelSize)
             memcpy(&s_PixelBuffer[0], pixels, s_SizePerPixel * w * h);
         }
 
-        //TextHelper::print_glyph(&s_PixelBuffer[0], w, h);
+        TextHelper::print_glyph(&s_PixelBuffer[0], w, h);
 
         GlyphAtals* atlas = RequestAtlas(pixelSize, Internal::Vector2(w, h));
         Assert(atlas);
@@ -208,7 +211,7 @@ bool Font::RenderCharacter(character::Unicode codepoint, int pixelSize)
         character.position = rect;
         character.bearing = Internal::Vector2(m_FTFace->glyph->bitmap_left, m_FTFace->glyph->bitmap_top);
     }
-    else // 空格
+    else // space、tab
     {
         character.atlas = FONT_NOT_IN_ATLAS_PLACEHOLDER;
         character.position = Rect(0,0,0,0);
@@ -295,7 +298,7 @@ GlyphAtals* Font::RequestAtlas(int pixelSize, Internal::Vector2 preferSize)
 Texture* Font::CreateAtlas()
 {
 	TextureSetting setting; 
-	setting.filterMode = ETextureFilterMode::Linear;
+	setting.filterMode = ETextureFilterMode::Nearest;
 	setting.wrapMode = ETextureWrapMode::Clamp;
 	setting.format = ETextureFormat::R8;
 	setting.type = ETextureType::TEX_2D;
diff --git a/Runtime/GUI/Font.h b/Runtime/GUI/Font.h
index 5fbe981..cd546af 100644
--- a/Runtime/GUI/Font.h
+++ b/Runtime/GUI/Font.h
@@ -93,6 +93,7 @@ enum EEncoding
     Encoding_UTF16,
 };
 
+// 没有字形，但是有advance的文字，比如space和tab
 #define FONT_NOT_IN_ATLAS_PLACEHOLDER (INT_MAX)
 
 // 单个字体
diff --git a/Runtime/GUI/UITextMesh.cpp b/Runtime/GUI/UITextMesh.cpp
index abb5231..94e61c4 100644
--- a/Runtime/GUI/UITextMesh.cpp
+++ b/Runtime/GUI/UITextMesh.cpp
@@ -29,6 +29,7 @@ static unsigned int s_IndicesPerText;
 struct TextInfo {
 	const Character* ch;
 	float offset;
+    int line; // 从0开始
 };
 
 static unordered_map<unsigned int, vector<TextInfo>> s_TextInfos;
@@ -59,27 +60,56 @@ InitializeStaticVariables([]() {
 // * 换行
 // * 颜色
 
-UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, ETextAnchor anchor, ETextAlignment alignment)
+// lineheight 用来处理换行、锚点
+// wordwrap 自动换行
+// preferredSize 自动换行区域大小
+UITextMesh::UITextMesh(const UnicodeString& str, Font* font, int pixelSize, int lineHeight, ETextAnchor anchor, ETextAlignment alignment, bool wordwrap, float preferred)
 {
 	m_Font = font;
 	s_TextInfos.clear();
     const Vector2 atlasSize = font->GetAtlasSize();
 
+    Vector2 textRegion;
     // 按照不同的atlas分类到s_TextInfos
 	float offset = 0;
+    int line = 0;
 	for (int i = 0; i < str.length; ++i)
 	{
 		character::Unicode c = str.str[i];
 		const Character* ch = font->GetCharacter(c, pixelSize);
         if (ch == NULL)
             continue;
+
+        if (wordwrap) // 自动换行
+        {
+            if (offset + ch->bearing.x + ch->position.width > preferred)
+            {
+                ++line;
+                offset = 0;
+            }
+        }
+
 		unsigned int atlasIndex = ch->atlas;
-		
         if (atlasIndex != FONT_NOT_IN_ATLAS_PLACEHOLDER) //非空格
         {
+
+// 换行符Unix'\n', Windows'\r\n', MacOS '\r'
+#define CHECK_BREAKS() \
+            if (c == '\n' || c == '\r')                                                       \
+            {                                                                                 \
+                ++line;                                                                       \
+                offset = 0;                                                                   \
+                if (c == '\r' && ((i + 1) < str.length && str.str[i + 1] == '\n')) /*skip\n*/ \
+                    ++i;                                                                      \
+                continue;                                                                     \
+            }
+
+            CHECK_BREAKS();
+
             TextInfo info;
             info.ch = ch;
             info.offset = offset;
+            info.line = line;
 
             auto list = s_TextInfos.find(atlasIndex);
             if (list == s_TextInfos.end())
@@ -88,13 +118,37 @@ UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, EText
             vector<TextInfo>& v = s_TextInfos[atlasIndex];
             v.push_back(info);
         }
+        else
+        {
+            // 有些字体换行没有字形，所以也需要在这里处理
+            CHECK_BREAKS();
+        }
 
 		offset += ch->advance;
+
+        textRegion.x = max(offset, textRegion.x);
 	}
 
+    textRegion.y = (line + 1) * lineHeight;
+
 	if (s_TextInfos.size() == 0)
 		return;
 
+    Vector2i textOffset;
+    Vector2 halfRegion = Vector2(textRegion.x/ 2.f, textRegion.y / 2.f);
+    switch (anchor)
+    {
+        case TextAnchor_UpperLeft:    textOffset.Set(0,             0);             break;
+        case TextAnchor_UpperCenter:  textOffset.Set(-halfRegion.x, 0);             break;
+        case TextAnchor_UpperRight:   textOffset.Set(-textRegion.x, 0);             break;
+        case TextAnchor_MiddleLeft:   textOffset.Set(0,             -halfRegion.y); break;
+        case TextAnchor_MiddleCenter: textOffset.Set(-halfRegion.x, -halfRegion.y); break;
+        case TextAnchor_MiddleRight:  textOffset.Set(-textRegion.x, -halfRegion.y); break;
+        case TextAnchor_LowerLeft:    textOffset.Set(0,             -textRegion.y); break;
+        case TextAnchor_LowerCenter:  textOffset.Set(-halfRegion.x, -textRegion.y); break;
+        case TextAnchor_LowerRight:   textOffset.Set(-textRegion.x, -textRegion.y); break;
+    }
+
     // 填充VBO和IBO
 	for (auto iter : s_TextInfos) {
 		unsigned int atlasIndex = iter.first; // atlas atlasIndex
@@ -113,12 +167,13 @@ UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, EText
             TextInfo& text = texts[i];
 
             int vOff = i * s_VertexPerText;
+            int lineOff = text.line * lineHeight;
 			// 左上角是原点
             float pos[] = {
-				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
-				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right 
-				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y,                            // top-right 
-				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y,                            // top-left 
+				textOffset.x + text.offset + text.ch->bearing.x,                           textOffset.y + lineOff + pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
+				textOffset.x + text.offset + text.ch->bearing.x + text.ch->position.width, textOffset.y + lineOff + pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right 
+				textOffset.x + text.offset + text.ch->bearing.x + text.ch->position.width, textOffset.y + lineOff + pixelSize - text.ch->bearing.y,                            // top-right 
+				textOffset.x + text.offset + text.ch->bearing.x,                           textOffset.y + lineOff + pixelSize - text.ch->bearing.y,                            // top-left 
             };
             Vector4 uvQuad = Vector4(text.ch->position.x / atlasSize.x, text.ch->position.y / atlasSize.y, text.ch->position.width / atlasSize.x, text.ch->position.height / atlasSize.y);
             float uv[] = {
diff --git a/Runtime/GUI/UITextMesh.h b/Runtime/GUI/UITextMesh.h
index c88e52f..487bccd 100644
--- a/Runtime/GUI/UITextMesh.h
+++ b/Runtime/GUI/UITextMesh.h
@@ -17,7 +17,6 @@ enum ETextAnchor
     TextAnchor_LowerLeft,
     TextAnchor_LowerCenter,
     TextAnchor_LowerRight,
-    TextAnchor_DontCare		
 };
 
 enum ETextAlignment {
@@ -37,7 +36,7 @@ namespace TextHelper
 class UITextMesh
 {
 public:
-	UITextMesh(const UnicodeString& str, Font* font, int pixelSize, ETextAnchor anchor, ETextAlignment alignment)/*throw TextMeshException*/;
+	UITextMesh(const UnicodeString& str, Font* font, int pixelSize, int lineHeight, ETextAnchor anchor = TextAnchor_UpperLeft, ETextAlignment alignment = TextAlignment_Left, bool wordwrap = false, float preferred = 0)/*throw TextMeshException*/;
 
 	~UITextMesh();