Hash :
2723c7d3
Author :
Date :
2010-05-22T22:17:27
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/*
* FTGL - OpenGL font library
*
* Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
* Copyright (c) 2008 Sam Hocevar <sam@hocevar.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <cassert>
#include <string> // For memset
#include "FTGL/ftgl.h"
#include "FTInternals.h"
#include "../FTGlyph/FTTextureGlyphImpl.h"
#include "./FTTextureFontImpl.h"
//
// FTTextureFont
//
FTTextureFont::FTTextureFont(char const *fontFilePath) :
FTFont(new FTTextureFontImpl(this, fontFilePath))
{}
FTTextureFont::FTTextureFont(const unsigned char *pBufferBytes,
size_t bufferSizeInBytes) :
FTFont(new FTTextureFontImpl(this, pBufferBytes, bufferSizeInBytes))
{}
FTTextureFont::~FTTextureFont()
{}
FTGlyph* FTTextureFont::MakeGlyph(FT_GlyphSlot ftGlyph)
{
FTTextureFontImpl *myimpl = dynamic_cast<FTTextureFontImpl *>(impl);
if(!myimpl)
{
return NULL;
}
return myimpl->MakeGlyphImpl(ftGlyph);
}
//
// FTTextureFontImpl
//
static inline GLuint ClampSize(GLuint in, GLuint maxTextureSize)
{
// Find next power of two
--in;
in |= in >> 16;
in |= in >> 8;
in |= in >> 4;
in |= in >> 2;
in |= in >> 1;
++in;
// Clamp to max texture size
return in < maxTextureSize ? in : maxTextureSize;
}
FTTextureFontImpl::FTTextureFontImpl(FTFont *ftFont, const char* fontFilePath)
: FTFontImpl(ftFont, fontFilePath),
maximumGLTextureSize(0),
textureWidth(0),
textureHeight(0),
glyphHeight(0),
glyphWidth(0),
padding(3),
xOffset(0),
yOffset(0)
{
load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
remGlyphs = numGlyphs = face.GlyphCount();
}
FTTextureFontImpl::FTTextureFontImpl(FTFont *ftFont,
const unsigned char *pBufferBytes,
size_t bufferSizeInBytes)
: FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes),
maximumGLTextureSize(0),
textureWidth(0),
textureHeight(0),
glyphHeight(0),
glyphWidth(0),
padding(3),
xOffset(0),
yOffset(0)
{
load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
remGlyphs = numGlyphs = face.GlyphCount();
}
FTTextureFontImpl::~FTTextureFontImpl()
{
if(textureIDList.size())
{
glDeleteTextures((GLsizei)textureIDList.size(),
(const GLuint*)&textureIDList[0]);
}
}
FTGlyph* FTTextureFontImpl::MakeGlyphImpl(FT_GlyphSlot ftGlyph)
{
glyphHeight = static_cast<int>(charSize.Height() + 0.5f);
glyphWidth = static_cast<int>(charSize.Width() + 0.5f);
if(glyphHeight < 1) glyphHeight = 1;
if(glyphWidth < 1) glyphWidth = 1;
if(textureIDList.empty())
{
textureIDList.push_back(CreateTexture());
xOffset = yOffset = padding;
}
if(xOffset > (textureWidth - glyphWidth))
{
xOffset = padding;
yOffset += glyphHeight;
if(yOffset > (textureHeight - glyphHeight))
{
textureIDList.push_back(CreateTexture());
yOffset = padding;
}
}
FTTextureGlyph* tempGlyph = new FTTextureGlyph(ftGlyph, textureIDList[textureIDList.size() - 1],
xOffset, yOffset, textureWidth, textureHeight);
xOffset += static_cast<int>(tempGlyph->BBox().Upper().X() - tempGlyph->BBox().Lower().X() + padding + 0.5);
--remGlyphs;
return tempGlyph;
}
void FTTextureFontImpl::CalculateTextureSize()
{
if(!maximumGLTextureSize)
{
maximumGLTextureSize = 1024;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, (GLint*)&maximumGLTextureSize);
assert(maximumGLTextureSize); // Indicates an invalid OpenGL context
}
// Texture width required for remGlyphs glyphs
textureWidth = ClampSize(remGlyphs * glyphWidth + padding * 2,
maximumGLTextureSize);
// Number of glyphs we can store in one line
int n = (textureWidth - (padding * 2)) / glyphWidth;
// Texture height required for numGlyphs glyphs
textureHeight = ClampSize(glyphHeight * (numGlyphs / (n ? n : 1) + 1),
maximumGLTextureSize);
}
GLuint FTTextureFontImpl::CreateTexture()
{
CalculateTextureSize();
int totalMemory = textureWidth * textureHeight;
unsigned char* textureMemory = new unsigned char[totalMemory];
memset(textureMemory, 0, totalMemory);
GLuint textID;
glGenTextures(1, (GLuint*)&textID);
glBindTexture(GL_TEXTURE_2D, textID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight,
0, GL_ALPHA, GL_UNSIGNED_BYTE, textureMemory);
delete [] textureMemory;
return textID;
}
bool FTTextureFontImpl::FaceSize(const unsigned int size, const unsigned int res)
{
if(!textureIDList.empty())
{
glDeleteTextures((GLsizei)textureIDList.size(), (const GLuint*)&textureIDList[0]);
textureIDList.clear();
remGlyphs = numGlyphs = face.GlyphCount();
}
return FTFontImpl::FaceSize(size, res);
}
template <typename T>
inline FTPoint FTTextureFontImpl::RenderI(const T* string, const int len,
FTPoint position, FTPoint spacing,
int renderMode)
{
// Protect GL_TEXTURE_2D
glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
FTTextureGlyphImpl::ResetActiveTexture();
FTPoint tmp = FTFontImpl::Render(string, len,
position, spacing, renderMode);
glPopAttrib();
return tmp;
}
FTPoint FTTextureFontImpl::Render(const char * string, const int len,
FTPoint position, FTPoint spacing,
int renderMode)
{
return RenderI(string, len, position, spacing, renderMode);
}
FTPoint FTTextureFontImpl::Render(const wchar_t * string, const int len,
FTPoint position, FTPoint spacing,
int renderMode)
{
return RenderI(string, len, position, spacing, renderMode);
}