From 5cd2e2299f98065fa06c192df4dfb2c014b2b253 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 3 Nov 2021 13:08:39 +0800
Subject: *font

---
 Runtime/GUI/Font.cpp | 65 +++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 51 insertions(+), 14 deletions(-)

(limited to 'Runtime/GUI/Font.cpp')

diff --git a/Runtime/GUI/Font.cpp b/Runtime/GUI/Font.cpp
index 614792a..d669844 100644
--- a/Runtime/GUI/Font.cpp
+++ b/Runtime/GUI/Font.cpp
@@ -15,6 +15,9 @@ using namespace character;
 
 static std::string s_FontError;
 
+static std::vector<unsigned char> s_PixelBuffer;
+static int s_SizePerPixel = sizeof(unsigned char);
+
 Font::Font(std::string path, TextGeneratingSettings settings)
     : LuaBind::NativeClass<Font>()
 {
@@ -109,8 +112,14 @@ const Character* Font::GetCharacter(character::Codepoint codepoint, int pixelSiz
 	auto iter = m_Characters.find(hash);
 	if (iter == m_Characters.end())
 	{
-		RenderCharacter(codepoint, pixelSize);
-		iter = m_Characters.find(hash);
+        if (RenderCharacter(codepoint, pixelSize))
+        {
+            iter = m_Characters.find(hash);
+        }
+        else
+        {
+            return NULL;
+        }
 	}
 	Assert(iter != m_Characters.end());
 	return &iter->second;
@@ -133,21 +142,48 @@ void Font::RenderCharacters(std::vector<character::Codepoint>& codepoint, int pi
     }
 }
 
-void Font::RenderCharacter(character::Codepoint codepoint, int pixelSize)
+bool Font::RenderCharacter(character::Codepoint codepoint, int pixelSize)
 {
 	character::Hash hash = GetHash(codepoint, pixelSize);
 	if (m_Characters.count(hash) != 0)
-		return; 
+		return true; 
 	FT_Set_Pixel_Sizes(m_FTFace, 0, pixelSize);
-	if (FT_Load_Char(m_FTFace, codepoint, FT_LOAD_RENDER))
-	{
-		return;
-	}
+
+    // bug: 发现有时候渲染的结果是FT_PIXEL_MODE_MONO（1-bits)，试过不同的flags组合还是不对，最后手动转换为8-bits
+
+    //FT_Int32 flags = FT_LOAD_TARGET_NORMAL | FT_LOAD_FORCE_AUTOHINT;
+    FT_Int32 flags = FT_LOAD_RENDER;
+    if (FT_Load_Char(m_FTFace, codepoint, flags))
+		return false;
 
 	int w = m_FTFace->glyph->bitmap.width;
 	int h = m_FTFace->glyph->bitmap.rows;
 	
-	TextHelper::print_glyph(m_FTFace->glyph->bitmap.buffer, w, h);
+    const unsigned char* pixels = m_FTFace->glyph->bitmap.buffer;
+    if (pixels == NULL)
+        return false;
+
+    s_PixelBuffer.resize(w * h);
+    if (m_FTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO)
+    {
+        // 1 bit monochrome 
+        int pitch = m_FTFace->glyph->bitmap.pitch;
+        for (int y = 0; y < h; ++y)
+        {
+            for (int x = 0; x < w; ++x)
+            {
+                int index = x + y * w;
+                s_PixelBuffer[index] = ((pixels[pitch * y + x / 8]) & (1 << (7 - x % 8))) ? 255 : 0;
+            }
+        }
+    }
+    else if (m_FTFace->glyph->bitmap.pixel_mode)
+    {
+        // 8 bit grayscale
+        memcpy(&s_PixelBuffer[0], pixels, s_SizePerPixel * w * h);
+    }
+
+	//TextHelper::print_glyph(&s_PixelBuffer[0], w, h);
 
 	GlyphAtals* atlas = RequestAtlas(pixelSize, Internal::Vector2(w, h));
 	Assert(atlas);
@@ -156,15 +192,17 @@ void Font::RenderCharacter(character::Codepoint codepoint, int pixelSize)
 
 	try
 	{
-		atlas->altas->UpdateSubImage(rect, EPixelFormat::PixelFormat_R, EPixelElementType::PixelType_UNSIGNED_BYTE, m_FTFace->glyph->bitmap.buffer);
+		atlas->altas->UpdateSubImage(rect, EPixelFormat::PixelFormat_R, EPixelElementType::PixelType_UNSIGNED_BYTE, &s_PixelBuffer[0]);
 	}
 	catch (TextureException& e)
 	{
+        s_PixelBuffer.clear();
 		std::string error = e.what();
 		error = "Render Character Error: " + error;
 		log_error(e.what());
-		return;
+		return false;
 	}
+    s_PixelBuffer.clear();
 
 	Character character;
 	character.atlas = atlas->index;
@@ -173,9 +211,8 @@ void Font::RenderCharacter(character::Codepoint codepoint, int pixelSize)
 	character.advance = m_FTFace->glyph->advance.x * 1/64.f;
 
 	m_Characters.insert(std::pair<character::Hash, Character>(hash, character));
-/*
-	FT_Done_Face(m_FTFace);
-	FT_Done_FreeType(m_FTLibrary);*/
+
+    return true;
 }
 
 const GlyphAtals* Font::GetGlyphAtlas(int index)
-- 
cgit v1.1-26-g67d0