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/*
* FTGL - OpenGL font library
*
* Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
* Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
*
* 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 <math.h>
#include "FTGL/ftgl.h"
#include "FTInternals.h"
#include "FTTextureGlyphImpl.h"
//
// FTGLTextureGlyph
//
FTTextureGlyph::FTTextureGlyph(FT_GlyphSlot glyph, int id, int xOffset,
int yOffset, int width, int height) :
FTGlyph(new FTTextureGlyphImpl(glyph, id, xOffset, yOffset, width, height))
{}
FTTextureGlyph::~FTTextureGlyph()
{}
const FTPoint& FTTextureGlyph::Render(const FTPoint& pen, int renderMode)
{
FTTextureGlyphImpl *myimpl = dynamic_cast<FTTextureGlyphImpl *>(impl);
return myimpl->RenderImpl(pen, renderMode);
}
//
// FTGLTextureGlyphImpl
//
GLint FTTextureGlyphImpl::activeTextureID = 0;
FTTextureGlyphImpl::FTTextureGlyphImpl(FT_GlyphSlot glyph, int id, int xOffset,
int yOffset, int width, int height)
: FTGlyphImpl(glyph),
destWidth(0),
destHeight(0),
glTextureID(id)
{
/* FIXME: need to propagate the render mode all the way down to
* here in order to get FT_RENDER_MODE_MONO aliased fonts.
*/
err = FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL);
if(err || glyph->format != ft_glyph_format_bitmap)
{
return;
}
FT_Bitmap bitmap = glyph->bitmap;
destWidth = bitmap.width;
destHeight = bitmap.rows;
if(destWidth && destHeight)
{
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, glTextureID);
glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, destWidth, destHeight, GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.buffer);
glPopClientAttrib();
}
// 0
// +----+
// | |
// | |
// | |
// +----+
// 1
uv[0].X(static_cast<float>(xOffset) / static_cast<float>(width));
uv[0].Y(static_cast<float>(yOffset) / static_cast<float>(height));
uv[1].X(static_cast<float>(xOffset + destWidth) / static_cast<float>(width));
uv[1].Y(static_cast<float>(yOffset + destHeight) / static_cast<float>(height));
corner = FTPoint(glyph->bitmap_left, glyph->bitmap_top);
}
FTTextureGlyphImpl::~FTTextureGlyphImpl()
{}
const FTPoint& FTTextureGlyphImpl::RenderImpl(const FTPoint& pen,
int renderMode)
{
float dx, dy;
if(activeTextureID != glTextureID)
{
glBindTexture(GL_TEXTURE_2D, (GLuint)glTextureID);
activeTextureID = glTextureID;
}
dx = floor(pen.Xf() + corner.Xf());
dy = floor(pen.Yf() + corner.Yf());
glBegin(GL_QUADS);
glTexCoord2f(uv[0].Xf(), uv[0].Yf());
glVertex2f(dx, dy);
glTexCoord2f(uv[0].Xf(), uv[1].Yf());
glVertex2f(dx, dy - destHeight);
glTexCoord2f(uv[1].Xf(), uv[1].Yf());
glVertex2f(dx + destWidth, dy - destHeight);
glTexCoord2f(uv[1].Xf(), uv[0].Yf());
glVertex2f(dx + destWidth, dy);
glEnd();
return advance;
}
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