Re: [ft] FT_Set_Char_Size vs. FT_Set_Pixel_Sizes

[Olumide]

On 19/11/2016 17:42, Werner LEMBERG wrote:
> > Then I loaded the character 'f'(shorter than the pipe symbol)
> > expecting to get a bitmap with fewer rows, instead I got a bitmap
> > with a larger number of rows.
>
> It's not clear to me whether you simply get a larger bitmap (i.e.,
> more rows), or whether the glyph itself (this is, the rendered black
> pixels) is larger...

I'm getting more rows (see sample code).

> In case you haven't solved the problem yet please provide a
> standalone, *small* demo program for the terminal that exhibits the
> issue.

Here is a sample program; and here's the output that I'm getting:

Output:
    Num rows (char |): 32
    Num rows (char f): 38

------------------------------------------------------------------

#include <iostream>
#include <ft2build.h>
#include FT_FREETYPE_H

#define CHECK_STATUS( err , msg )            \
    if( err )                                \
    {                                        \
        LOG_ERROR << msg << " failed ...";   \
        exit( EXIT_FAILURE );                \
    }                                        \


// Omitting cleanup for brevity
int main(int argc, char* argv[] )
{
    FT_Face face;
    FT_Error error;
    FT_GlyphSlot slot;
    FT_Library library;

    const char* filename = "C:\\Windows\\Fonts\\frank.ttf";

    error = FT_Init_FreeType( &library );
    CHECK_STATUS( error , "Initialize library" )

    error = FT_New_Face( library , filename, 0 , &face );
    CHECK_STATUS( error , "Create face" )

    error = FT_Set_Pixel_Sizes( face , 55 , 55 );
    CHECK_STATUS( error , "Set pixel size" )

    error = FT_Load_Char( face, '|' , FT_LOAD_RENDER | 
FT_LOAD_MONOCHROME );
    CHECK_STATUS( error , "Load char" )

    slot = face->glyph;
    std::cout << "Num rows: " << slot->bitmap.rows << std::endl;

    error = FT_Load_Char( face, 'f' , FT_LOAD_RENDER | 
FT_LOAD_MONOCHROME );
    CHECK_STATUS( error , "Load char" )
    std::cout << "Num rows: " << slot->bitmap.rows << std::endl;

    return 0;
}

------------------------------------------------------------------

Regards,

- Olumide