FreeType bitmaps are zeroed after rendering a glyph










0















I've created a repository that has the most basic way to reproduce my issue. I use Cmake to build and it's set up to statically link freetype into my executable.



FreeType is a submodule, so you can clone it all at once with:



git clone --recurse-submodules https://github.com/jeffw387/freetype_minimum_test



or if you prefer just clone freetype from git into the externals directory.



I'm currently testing on Ubuntu.



I can initialize FreeType, create a face from the font, and load a glyph from a character code with the FT_LOAD_RENDER flag all without errors.



Then when I inspect the bitmap buffer, it's zero-initialized on every row. I used gdb from within VS Code in order to inspect the buffer, but before that I also tried copying out the data line by line.



The font I'm testing with is a free font I found online, but I was able to test it in Libre Office and it seems to work just fine.



Can anyone spot a problem with the code? If anyone is willing I'd love to know if this repo creates the same issue on their machine.



Here's my cpp file for easy viewing:



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

int main()
FT_Library library;
if (FT_Init_FreeType(&library))
std::cout << "Error initializing FreeType.";


FT_Face face;
auto faceResult = FT_New_Face(library, "Anke.ttf", 0, &face);
if (faceResult)
std::cout << "Error creating face.";


if ((face->face_flags & FT_FACE_FLAG_SCALABLE) != FT_FACE_FLAG_SCALABLE)
std::cout << "Error: font is not scalable.";


if (FT_Set_Pixel_Sizes(face, 0, 50))
std::cout << "Error setting font pixel size.";


if (FT_Load_Char(face, 'P', FT_LOAD_RENDER))
std::cout << "Error loading or rendering glyph.";

auto bmp = face->glyph->bitmap;

return 0;










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    0















    I've created a repository that has the most basic way to reproduce my issue. I use Cmake to build and it's set up to statically link freetype into my executable.



    FreeType is a submodule, so you can clone it all at once with:



    git clone --recurse-submodules https://github.com/jeffw387/freetype_minimum_test



    or if you prefer just clone freetype from git into the externals directory.



    I'm currently testing on Ubuntu.



    I can initialize FreeType, create a face from the font, and load a glyph from a character code with the FT_LOAD_RENDER flag all without errors.



    Then when I inspect the bitmap buffer, it's zero-initialized on every row. I used gdb from within VS Code in order to inspect the buffer, but before that I also tried copying out the data line by line.



    The font I'm testing with is a free font I found online, but I was able to test it in Libre Office and it seems to work just fine.



    Can anyone spot a problem with the code? If anyone is willing I'd love to know if this repo creates the same issue on their machine.



    Here's my cpp file for easy viewing:



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

    int main()
    FT_Library library;
    if (FT_Init_FreeType(&library))
    std::cout << "Error initializing FreeType.";


    FT_Face face;
    auto faceResult = FT_New_Face(library, "Anke.ttf", 0, &face);
    if (faceResult)
    std::cout << "Error creating face.";


    if ((face->face_flags & FT_FACE_FLAG_SCALABLE) != FT_FACE_FLAG_SCALABLE)
    std::cout << "Error: font is not scalable.";


    if (FT_Set_Pixel_Sizes(face, 0, 50))
    std::cout << "Error setting font pixel size.";


    if (FT_Load_Char(face, 'P', FT_LOAD_RENDER))
    std::cout << "Error loading or rendering glyph.";

    auto bmp = face->glyph->bitmap;

    return 0;










    share|improve this question
























      0












      0








      0








      I've created a repository that has the most basic way to reproduce my issue. I use Cmake to build and it's set up to statically link freetype into my executable.



      FreeType is a submodule, so you can clone it all at once with:



      git clone --recurse-submodules https://github.com/jeffw387/freetype_minimum_test



      or if you prefer just clone freetype from git into the externals directory.



      I'm currently testing on Ubuntu.



      I can initialize FreeType, create a face from the font, and load a glyph from a character code with the FT_LOAD_RENDER flag all without errors.



      Then when I inspect the bitmap buffer, it's zero-initialized on every row. I used gdb from within VS Code in order to inspect the buffer, but before that I also tried copying out the data line by line.



      The font I'm testing with is a free font I found online, but I was able to test it in Libre Office and it seems to work just fine.



      Can anyone spot a problem with the code? If anyone is willing I'd love to know if this repo creates the same issue on their machine.



      Here's my cpp file for easy viewing:



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

      int main()
      FT_Library library;
      if (FT_Init_FreeType(&library))
      std::cout << "Error initializing FreeType.";


      FT_Face face;
      auto faceResult = FT_New_Face(library, "Anke.ttf", 0, &face);
      if (faceResult)
      std::cout << "Error creating face.";


      if ((face->face_flags & FT_FACE_FLAG_SCALABLE) != FT_FACE_FLAG_SCALABLE)
      std::cout << "Error: font is not scalable.";


      if (FT_Set_Pixel_Sizes(face, 0, 50))
      std::cout << "Error setting font pixel size.";


      if (FT_Load_Char(face, 'P', FT_LOAD_RENDER))
      std::cout << "Error loading or rendering glyph.";

      auto bmp = face->glyph->bitmap;

      return 0;










      share|improve this question














      I've created a repository that has the most basic way to reproduce my issue. I use Cmake to build and it's set up to statically link freetype into my executable.



      FreeType is a submodule, so you can clone it all at once with:



      git clone --recurse-submodules https://github.com/jeffw387/freetype_minimum_test



      or if you prefer just clone freetype from git into the externals directory.



      I'm currently testing on Ubuntu.



      I can initialize FreeType, create a face from the font, and load a glyph from a character code with the FT_LOAD_RENDER flag all without errors.



      Then when I inspect the bitmap buffer, it's zero-initialized on every row. I used gdb from within VS Code in order to inspect the buffer, but before that I also tried copying out the data line by line.



      The font I'm testing with is a free font I found online, but I was able to test it in Libre Office and it seems to work just fine.



      Can anyone spot a problem with the code? If anyone is willing I'd love to know if this repo creates the same issue on their machine.



      Here's my cpp file for easy viewing:



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

      int main()
      FT_Library library;
      if (FT_Init_FreeType(&library))
      std::cout << "Error initializing FreeType.";


      FT_Face face;
      auto faceResult = FT_New_Face(library, "Anke.ttf", 0, &face);
      if (faceResult)
      std::cout << "Error creating face.";


      if ((face->face_flags & FT_FACE_FLAG_SCALABLE) != FT_FACE_FLAG_SCALABLE)
      std::cout << "Error: font is not scalable.";


      if (FT_Set_Pixel_Sizes(face, 0, 50))
      std::cout << "Error setting font pixel size.";


      if (FT_Load_Char(face, 'P', FT_LOAD_RENDER))
      std::cout << "Error loading or rendering glyph.";

      auto bmp = face->glyph->bitmap;

      return 0;







      c++ git cmake freetype






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      asked Nov 14 '18 at 1:49









      Jeff WrightJeff Wright

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      286






















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          I've done some further testing and it seems like there was a problem with my freetype fork. I haven't gone to the trouble of figuring out what it was, but in any case now that I've tried it with a fresh clone from https://github.com/aseprite/freetype2 it works.






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            I've done some further testing and it seems like there was a problem with my freetype fork. I haven't gone to the trouble of figuring out what it was, but in any case now that I've tried it with a fresh clone from https://github.com/aseprite/freetype2 it works.






            share|improve this answer



























              0














              I've done some further testing and it seems like there was a problem with my freetype fork. I haven't gone to the trouble of figuring out what it was, but in any case now that I've tried it with a fresh clone from https://github.com/aseprite/freetype2 it works.






              share|improve this answer

























                0












                0








                0







                I've done some further testing and it seems like there was a problem with my freetype fork. I haven't gone to the trouble of figuring out what it was, but in any case now that I've tried it with a fresh clone from https://github.com/aseprite/freetype2 it works.






                share|improve this answer













                I've done some further testing and it seems like there was a problem with my freetype fork. I haven't gone to the trouble of figuring out what it was, but in any case now that I've tried it with a fresh clone from https://github.com/aseprite/freetype2 it works.







                share|improve this answer












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                answered Nov 16 '18 at 2:16









                Jeff WrightJeff Wright

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