SFML community forums

Help => Graphics => Topic started by: theo on September 15, 2021, 02:35:43 pm

Title: problem with sf::Text getGlobalBounds() / getLocalBounds()
Post by: theo on September 15, 2021, 02:35:43 pm

I take the bounds of an sf::Text object:

sf::Text t{};
t.setFont(m_font);  // yes, m_font is loaded and in scope at this point
t.setString("Hello world");
t.setCharacterSize(20);
auto bounds = t.getGlobalBounds();  // same behaviour with getLocalBounds()

This used to work fine, but now I get the following error:

Exception thrown at 0x00007FFCCAAD2B8D (freetyped.dll) in test.exe: 0xC0000005: Access violation reading location 0x0000000000000008.

The only thing that seems to have changed is an upgrade of freetype to version 2.11.0 (through vcpkg). This might be more a bug in freetype than in SFML, but I can't really tell.

Title: Re: problem with sf::Text getGlobalBounds() / getLocalBounds()
Post by: theo on September 15, 2021, 02:59:58 pm

The problem seems to be deeper: sf::Text also doesn't draw properly anymore. Very minimal program:

(click to show/hide)

#include <SFML/Graphics.hpp>
#include <iostream>

int main()
{
   sf::Font f{};
   if (!f.loadFromFile("bkant.ttf"))
   {
      std::cout<<"font not found\n";
   }
   sf::Text t{ "hello world", f };
   sf::CircleShape c{ 10 };
   sf::RenderWindow win{ sf::VideoMode{800, 600}, "test" };
   sf::Event ev;

   while (win.isOpen())
   {
      while (win.pollEvent(ev))
      {
         switch (ev.type)
         {
         case sf::Event::Closed:
            win.close();
            break;
         }
      }
      win.clear(sf::Color::Blue);
      win.draw(c);   // draws without issue
      //win.draw(t); // crashes with exception from freetype
      win.display();
   }
}

Compiled with visual studio 16.11.3

Installed libraries (via vcpkg):

(click to show/hide)

C:\vcpkg>vcpkg.exe list
brotli:x64-windows                                 1.0.9#1          a generic-purpose lossless compression algorithm...
bzip2:x64-windows                                  1.0.8#2          bzip2 is a freely available, patent free, high-q...
freetype:x64-windows                               2.11.0           A library to render fonts.
freetype[brotli]:x64-windows                                        Support decompression of WOFF2 streams
freetype[bzip2]:x64-windows                                         Support bzip2 compressed fonts.
freetype[png]:x64-windows                                           Support PNG compressed OpenType embedded bitmaps.
freetype[zlib]:x64-windows                                          Use zlib instead of internal library for DEFLATE
libflac:x64-windows                                1.3.3#5          Library for manipulating FLAC files
libogg:x64-windows                                 1.3.5            Ogg is a multimedia container format, and the na...
libpng:x64-windows                                 1.6.37#15        libpng is a library implementing an interface fo...
libvorbis:x64-windows                              1.3.7#1          Ogg Vorbis is a fully open, non-proprietary, pat...
openal-soft:x64-windows                            1.21.1#2         OpenAL Soft is an LGPL-licensed, cross-platform,...
sfgui:x64-windows                                  0.4.0#4          simple and fast graphical user interface library
sfml:x64-windows                                   2.5.1#10         Simple and fast multimedia library
stb:x64-windows                                    2020-09-14       public domain header-only libraries
tinyxml2:x64-windows                               8.0.0-1          A simple, small, efficient, C++ XML parser
vcpkg-cmake-config:x64-windows                     2021-05-22#1
vcpkg-cmake:x64-windows                            2021-07-30
zlib:x64-windows                                   1.2.11#11        A compression library

C:\vcpkg>

Title: Re: problem with sf::Text getGlobalBounds() / getLocalBounds()
Post by: theo on September 15, 2021, 03:25:42 pm

interesting detail: the debugger watch suggests that variable t has no vertices

(click to show/hide)

-      t   {m_string={m_string={_Mypair=allocator } } m_font=0x00d3fd58 {m_library=0x0118c2d8 m_face=0x011ae678 ...} ...}   sf::Text {sfml-graphics-d-2.dll!sf::Text}
+      [sf::Text]   {m_string={m_string={_Mypair=allocator } } m_font=0x00d3fd58 {m_library=0x0118c2d8 m_face=0x011ae678 ...} ...}   sfml-graphics-d-2.dll!sf::Text
+      sf::Drawable   {...}   sf::Drawable
+      sf::Transformable   {m_origin={x=0.00000000 y=0.00000000 } m_position={x=0.00000000 y=0.00000000 } m_rotation=0.00000000 ...}   sf::Transformable
+      m_string   {m_string={_Mypair=allocator } }   sf::String
+      m_font   0x00d3fd58 {m_library=0x0118c2d8 m_face=0x011ae678 m_streamRec=0x00000000 ...}   const sf::Font *
      m_characterSize   30   unsigned int
      m_letterSpacingFactor   1.00000000   float
      m_lineSpacingFactor   1.00000000   float
      m_style   0   unsigned int
+      m_fillColor   {r=255 'ÿ' g=255 'ÿ' b=255 'ÿ' ...}   sf::Color
+      m_outlineColor   {r=0 '\0' g=0 '\0' b=0 '\0' ...}   sf::Color
      m_outlineThickness   0.00000000   float
+      m_vertices   {m_vertices={ size=0 } m_primitiveType=Triangles (3) }   sf::VertexArray
+      m_outlineVertices   {m_vertices={ size=0 } m_primitiveType=Triangles (3) }   sf::VertexArray
+      m_bounds   {left=0.00000000 top=0.00000000 width=0.00000000 ...}   sf::Rect<float>
      m_geometryNeedUpdate   true   bool
      m_fontTextureId   0   unsigned __int64

Title: Re: problem with sf::Text getGlobalBounds() / getLocalBounds()
Post by: theo on September 16, 2021, 10:44:42 am

I see that this is a duplicate for https://en.sfml-dev.org/forums/index.php?topic=28213.0