crown-engine/src/TextRenderer.cpp

/*
Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto

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 "TextRenderer.h"
#include <GL/glew.h>	// FIXME
#include "Renderer.h"
#include "Device.h"

namespace crown
{

//-----------------------------------------------------------------------------
TextRenderer::TextRenderer()
{
}

//-----------------------------------------------------------------------------
TextRenderer::~TextRenderer()
{
}

//-----------------------------------------------------------------------------
void TextRenderer::BeginDraw()
{
}

//-----------------------------------------------------------------------------
void TextRenderer::EndDraw()
{
}

//-----------------------------------------------------------------------------
void TextRenderer::Draw(const Str& string, int x, int y, Font* font)
{
	Renderer* renderer = GetDevice()->GetRenderer();
	Font* mFont = font;
	Texture* tex = font->GetTexture();

	renderer->_SetTexturing(0, true);
	renderer->_SetTexture(0, tex);
	renderer->_SetTextureMode(0, tex->GetMode(), tex->GetBlendColor());
	renderer->_SetTextureFilter(0, tex->GetFilter());

	Color4 mColor = Color4::BLACK;
	uint mCharSpacing = 0;
	uint mLineSpacing = 0;
	

	glColor4fv(mColor.to_float_ptr());
    glPushMatrix();
    glTranslatef((float)x, (float)y, 0.0f);
  
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  
    for (uint i = 0; i < string.GetLength(); i++)
    {
        Glyph glyph;
        float left, right, bottom, top, advance, dummy;
        uint ttSizeX, ttSizeY;
  
        glyph = mFont->GetGlyph(string[i]);
  
        glyph.GetMetrics(left, right, bottom, top, dummy, dummy, advance, dummy);
        ttSizeX = (uint)((right - left) * tex->GetWidth());
        ttSizeY = (uint)((top - bottom) * tex->GetHeight());

        glBegin(GL_QUADS);
        glTexCoord2f(left, top);
        glVertex2i(0, 0);
        glTexCoord2f(left, bottom);
        glVertex2i(0, ttSizeY);
        glTexCoord2f(right, bottom);
        glVertex2i(ttSizeX, ttSizeY);
        glTexCoord2f(right, top);
        glVertex2i(ttSizeX, 0);
        glEnd();
  
        glTranslatef(advance + (float)mCharSpacing, 0, 0);
    }
  
    glPopMatrix();
    glDisable(GL_TEXTURE_2D);
	//glDisable(GL_BLEND);
}

//-----------------------------------------------------------------------------
void TextRenderer::GetStrDimensions(const Str& string, uint start, uint end, int& width, int& height)
{
//	if (mFont != NULL)
//	{
//		return;
//	}

//	height = 0;
//	width = 0;

//	//TODO: Should take baseline into account

//	if (end == (uint)-1)
//		end = string.GetLength();
//	for (uint i = start; i < end; i++)
//	{
//		Glyph glyph;
//		float gheight, gwidth, dummy, advance, baseline;

//		glyph = mFont->GetGlyph(string[i]);

//		glyph.GetMetrics(dummy, dummy, dummy, dummy, gwidth, gheight, advance, baseline);

//		height = Math::Max(height, (int)gheight) + (int)Math::Abs(gheight - baseline);
//		if (i < string.GetLength() - 1)
//			width += (int)advance;
//		else
//		{
//			width += (int)gwidth;
//		}
//	}
}

//-----------------------------------------------------------------------------
int TextRenderer::GetStrIndexFromDimensions(const Str& string, uint start, const Point2& position, Point2& charPosition)
{
//	if (mFont == NULL)
//	{
//		return -1;
//	}

//	int width = 0;

//	for (uint i = start; i < string.GetLength(); i++)
//	{
//		Glyph glyph;
//		float gheight, gwidth, dummy, advance;

//		glyph = mFont->GetGlyph(string[i]);

//		glyph.GetMetrics(dummy, dummy, dummy, dummy, gwidth, gheight, advance, dummy);

//		if (i >= string.GetLength())
//			advance = gwidth;

//		if (width + advance / 2.0f >= position.x)
//		{
//			charPosition.x = width;
//			charPosition.y = 0;
//			return i;
//		}
//		width += (int)advance;
//	}
//	charPosition.x = width;
//	charPosition.y = 0;
//	return string.GetLength();
}

//-----------------------------------------------------------------------------
int TextRenderer::GetMaxTextHeight()
{
//	return mFont->_GetMaxTextHeight();
}

} // namespace crown