Re: [boost] boost::freetype - extension for boost::gil

From: Jose (jmalv04_at_[hidden])
Date: 2007-04-13 04:38:18

Hi Tom,

This will be very useful ! Where can I download it ?
Is there a GIL-specific mailing list ? I imagine more people are using GIL
now and are sharing info.

Will the upcoming SOC project on Visualization of STL containers be able to
use your wrapper to add labels to graphs ?
http://code.google.com/soc/boost/about.html#

Regards,
jose

On 4/13/07, Tom Brinkman <reportbase_at_[hidden]> wrote:
>
> I've written a few freetype wrappers over the years.  I've since converted
> it to use boost::gil and
> will be submiting it to GIL graphics library developers as an extension.
> The source code
> is now available  for the asking.
>
> Yes, it supports "cleartype" and "kerning" so it will produce fonts are
> equivalent to Microsoft's and
> Apples.  I've also added extras such as "word-wrapping" and "clipping".
>
> Heres a complete working example of its usage.  It shows all the steps
> necessary, including
> initializing the "freetype" font engine, creating the boost::gil image and
> saving it as a "png" file.
>
> //Step 1.  Initialize the freetype library
> FT_Library library;
> FT_Face face;
> FT_Init_FreeType(&library);
> FT_New_Face(library,"c:/fonts/mini/ARGOW___.TTF",0,&face);
> FT_Set_Pixel_Sizes(face,0,12);
>
> //Step 2.  Create a gil image
> gil::rgba8_image_t img(200,30);
> gil::fill_pixels(gil::view(img),gil::rgba8_pixel_t(255,210,200,255));
>
> //Step 3. Initialize Variables
> std::string str = "A1234567890";
> boost::freetype::glyph glyphs;
> gil::rgba8_pixel_t black(0,0,0,255);
> typdef freetype::make_glyphs<gil::rgba8_pixel_t> make_glyphs_t;
> boost::gil::subimage_view view(view,0,0,width,height);
>
> //Step 4. Transform the string into a freetype::glyphs vector
> std::transform(str.begin(), str.end(),
>     std::back_inserter(glyphs), make_glyphs_t(face,black));
>
> //Step 5: Create kerning vector
> std::vector<int> kernings;
> std::transform(glyphs.begin(),glyphs.end(),
>     std::back_inserter(kernings), make_kerning());
>
> //Step 6. Draw the freetype::glyphs vector onto the gil image
> std::for_each(glyphs.begin(), units.end(), kernings.begin(),
>     boost::freetype::draw_glyphs<>(view));
>
> //Step 7. output the image
> png_write_view("c:/out/example_1.png", gil::view(img));
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