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#include "font.h"
#include <cassert>
namespace GUI
{
Font::Font(const std::string& fontfile)
: img_font(fontfile)
{
std::size_t px = 0;
std::size_t c;
for(c = 0; c < (characters.size() - 1) && px < img_font.width(); ++c)
{
auto& character = characters[c];
character.offset = px + 1;
if(c > 0)
{
assert(character.offset >= characters[c - 1].offset);
characters[c - 1].width = character.offset - characters[c - 1].offset;
if(characters[c].offset != characters[c - 1].offset)
{
--characters[c - 1].width;
}
}
++px;
while(px < img_font.width())
{
auto& pixel = img_font.getPixel(px, 0);
if((pixel.red() == 1.0f) && (pixel.green() == 0.0f) &&
(pixel.blue() == 1.0f) && (pixel.alpha() == 1.0f))
{
break;
}
++px;
}
characters[c] = character;
}
++c;
assert(characters[c].offset >= characters[c - 1].offset);
characters[c - 1].width = characters[c].offset - characters[c - 1].offset;
if(characters[c].offset != characters[c - 1].offset)
{
--characters[c - 1].width;
}
}
size_t Font::textWidth(const std::string& text) const
{
size_t len = 0;
for(unsigned char cha : text)
{
auto& character = characters[cha];
len += character.width + spacing + character.post_bias;
}
return len;
}
size_t Font::textHeight(const std::string& text) const
{
return img_font.height();
}
void Font::setLetterSpacing(int letterSpacing)
{
spacing = letterSpacing;
}
int Font::letterSpacing() const
{
return spacing;
}
PixelBufferAlpha *Font::render(const std::string& text) const
{
PixelBufferAlpha *pb =
new PixelBufferAlpha(textWidth(text), textHeight(text));
int x_offset = 0;
for(std::size_t i = 0; i < text.length(); ++i)
{
unsigned char cha = text[i];
auto& character = characters.at(cha);
for(size_t x = 0; x < character.width; ++x)
{
for(size_t y = 0; y < img_font.height(); ++y)
{
auto& c = img_font.getPixel(x + character.offset, y);
pb->setPixel(x + x_offset + character.pre_bias, y,
c.red() * 255, c.green() * 255,
c.blue() * 255, c.alpha() * 255);
}
}
x_offset += character.width + spacing + character.post_bias;
}
return pb;
}
}
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