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#include "freetype.h"
#include "TextGenerator.h"
#include "../Math/Math.h"
#include "Runtime/Debug/Log.h"
#include "Runtime/Utilities/Assert.h"
#include "Runtime/Graphics/ImageData.h"
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
void TextGenerator::Setup(TextGeneratingSettings settings)
{
m_AtlasMargin = settings.margin;
m_GlyphPadding = settings.padding;
m_AtlasSize = settings.atlasSize;
if (FT_Init_FreeType(&m_FTLibrary))
{
return;
}
if (FT_New_Face(m_FTLibrary, "Resources/Font/Deng.ttf", 0, &m_FTFace))
{
return;
}
}
character::Hash TextGenerator::GetHash(Codepoint codepoint, int pixelSize)
{
character::Hash hash;
hash.codepoint = codepoint;
hash.size = pixelSize;
return hash;
}
const Character* TextGenerator::GetCharacter(character::Codepoint codepoint, int pixelSize)
{
character::Hash hash = GetHash(codepoint, pixelSize);
auto iter = m_Characters.find(hash);
if (iter == m_Characters.end())
{
RenderCharacter(codepoint, pixelSize);
iter = m_Characters.find(hash);
}
Assert(iter != m_Characters.end());
return &iter->second;
}
void TextGenerator::RenderCharacters(character::Codepoint* codepoint, int n, int pixelSize)
{
for (int i = 0; i < n; ++i)
{
RenderCharacter(codepoint[i], pixelSize);
}
}
void TextGenerator::RenderCharacter(character::Codepoint codepoint, int pixelSize)
{
character::Hash hash = GetHash(codepoint, pixelSize);
if (m_Characters.count(hash) != 0)
return;
FT_Set_Pixel_Sizes(m_FTFace, 0, pixelSize);
if (FT_Load_Char(m_FTFace, codepoint, FT_LOAD_RENDER))
{
return;
}
int w = m_FTFace->glyph->bitmap.width;
int h = m_FTFace->glyph->bitmap.rows;
TextHelper::print_glyph(m_FTFace->glyph->bitmap.buffer, w, h);
GlyphAtals* atlas = RequestAtlas(pixelSize, Internal::Vector2(w, h));
Assert(atlas);
Internal::Rect rect = GetRenderChartAndMove(atlas, Internal::Vector2(w, h));
try
{
atlas->altas->UpdateSubImage(rect, EPixelFormat::PixelFormat_R, EPixelElementType::PixelType_UNSIGNED_BYTE, m_FTFace->glyph->bitmap.buffer);
}
catch (TextureException& e)
{
std::string error = e.what();
error = "Render Character Error: " + error;
log_error(e.what());
return;
}
Character character;
character.atlas = atlas->index;
character.position = rect;
character.bearing = Internal::Vector2(m_FTFace->glyph->bitmap_left, m_FTFace->glyph->bitmap_top);
character.advance = m_FTFace->glyph->advance.x * 1/64.f;
m_Characters.insert(std::pair<character::Hash, Character>(hash, character));
}
const GlyphAtals* TextGenerator::GetGlyphAtlas(int index)
{
if (index >= m_Atlases.size())
return NULL;
return &m_Atlases[index];
}
Internal::Rect TextGenerator::GetRenderChartAndMove(GlyphAtals* atlas, Internal::Vector2 preferSize)
{
Internal::Rect rect;
Internal::Vector2 space;
space.x = atlas->width - atlas->cursor.x - m_AtlasMargin;
space.y = atlas->height - atlas->cursor.y - m_AtlasMargin;
if (space.x > preferSize.x && space.y > preferSize.y)
{
rect.x = atlas->cursor.x;
rect.y = atlas->cursor.y;
rect.width = preferSize.x;
rect.height = preferSize.y;
atlas->cursor.x += rect.width + m_GlyphPadding;
atlas->rowHeight = max(atlas->rowHeight, preferSize.y);
}
else if (space.y - atlas->rowHeight - m_GlyphPadding - m_AtlasMargin > preferSize.y)
{
rect.x = m_AtlasMargin;
rect.y = atlas->cursor.y + m_GlyphPadding + atlas->rowHeight;
rect.width = preferSize.x;
rect.height = preferSize.y;
atlas->cursor.x = m_AtlasMargin;
atlas->cursor.y += atlas->rowHeight + m_GlyphPadding;
atlas->rowHeight = rect.height;
}
else
{
Assert(false);
}
return rect;
}
GlyphAtals* TextGenerator::RequestAtlas(int pixelSize, Internal::Vector2 preferSize)
{
GlyphAtals* atlas = NULL;
auto iter = m_AtlasCache.find(pixelSize);
if (iter == m_AtlasCache.end() || !HasEnoughSpace(iter->second, preferSize))
{
Texture* tex = CreateAtlas();
GlyphAtals newAtlas = GlyphAtals();
newAtlas.altas = tex;
newAtlas.width = m_AtlasSize.x;
newAtlas.height = m_AtlasSize.y;
newAtlas.index = m_Atlases.size();
newAtlas.cursor = Internal::Vector2(m_AtlasMargin, m_AtlasMargin);
m_Atlases.push_back(newAtlas);
atlas = &m_Atlases[m_Atlases.size() - 1];
if (iter != m_AtlasCache.end())
m_AtlasCache.erase(pixelSize);
m_AtlasCache.insert(std::pair<int, GlyphAtals*>(pixelSize, atlas));
}
else
{
atlas = iter->second;
}
Assert(atlas);
return atlas;
}
Texture* TextGenerator::CreateAtlas()
{
TextureSetting setting;
setting.filterMode = ETextureFilterMode::Linear;
setting.wrapMode = ETextureWrapMode::Clamp;
setting.format = ETextureFormat::R8;
setting.type = ETextureType::TEX_2D;
setting.keepImageData = false;
Texture* tex = new Texture(setting, m_AtlasSize.x, m_AtlasSize.y);
return tex;
}
bool TextGenerator::HasEnoughSpace(GlyphAtals* atlas, Internal::Vector2 preferSize)
{
if (atlas == NULL)
return false;
Internal::Vector2 space;
space.x = atlas->width - atlas->cursor.x - m_AtlasMargin;
space.y = atlas->height - atlas->cursor.y - m_AtlasMargin;
if (space.x > preferSize.x && space.y > preferSize.y)
return true;
if (space.y - atlas->rowHeight - m_GlyphPadding - m_AtlasMargin > preferSize.y)
return true;
return false;
}
Character GetCharacter(character::Codepoint Codepoint, int pixelSize)
{
return Character();
}
void TextHelper::print_glyph(unsigned char* glyph, int width, int height)
{
for (int r = 0; r < height; ++r)
{
for (int c = 0; c < width; ++c)
{
unsigned char ch = glyph[c + r * width];
printf("%c", ch == 0 ? ' ' : '+');
}
printf("\n");
}
}
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