Re: [Freetype] FT_Load_Glyph() - Always returns an error

[SOULLARD Clement]

Hi,

After, doing the test function you were asking. I realize that I did an 
incorrect use of the APIs.
After I ask for a wrong glyph number (encoding instead of glyphnumber), 
I had the error code but the glyph slot was not reset to 0.
That is why I thought, the error code was wrong because the incorrect 
glyph bounding box was similar
to the glyph bounding box I expected.

Sorry for that...

SOULLARD Clement wrote:

>I  meet the same problem with this function but I'am using it under 
>linux using freetype 2.1.7.
>
>In some context it return the right error (Function 2), in an other it 
>return an error (Function 1)
>
>It occurs in a particular context (Function 1) when asking for a 
>bounding box (To check collision), in this context  I use the load glyph 
>only to position the glyphSlot (as the glyph is already loaded). Thought 
>the returned result indicate an error, it performs correctly the loading 
>(Or at least the positionning of the glyph Slot)
>
>I use then :
>- FT_Load_Glyph (face, nglyph, FT_LOAD_DEFAULT);
>
>But when rendering the bitmap in (Fonction 2) It work correctly.
>
>I use then : (There is no error raised)
>- FT_Load_Glyph (face, nglyph, FT_LOAD_RENDER)
>
>Hope this help, ask me if you want more informations....
>
>The concerned functions are :
>
>/*********************
>         Function 1
>*********************/
>QCoordsRect FTFont::getBoundingBox (int nglyph)
>{
>  glyphSlot = face->glyph;
>  //Chargement de la fonte
>  int
>    error =
>    0;
>    error=FT_Load_Glyph (face, nglyph, FT_LOAD_DEFAULT);
>  if (error)
>    {
>  Tracer::printErr("FTFont::getBoundingBox Erreur dans le chargement du 
>glyph");
>    }
> //  Tracer::printInfo("Passage par la fonction getBoundingBox de FTFont: "+
>  // QString::number(  glyphSlot->metrics.width / 64)+","+
> //  QString::number( glyphSlot->metrics.height / 64));
>
>  return QCoordsRect (-glyphSlot->metrics.horiBearingX* SCALEFACTOR / 
>resX  ,
>    - glyphSlot->metrics.horiBearingY*SCALEFACTOR/ resY ,
>    (-glyphSlot->metrics.horiBearingX)* SCALEFACTOR / resX +  
>glyphSlot->metrics.width*SCALEFACTOR / resX ,
>     - glyphSlot->metrics.horiBearingY*SCALEFACTOR/ resY+   
>glyphSlot->metrics.height* SCALEFACTOR / resY);
>}
>///////////////END FUNCTION///////////////////////////
>
>/*************
>Second function
>***************/
>
>FT_Bitmap
>FTFont::renderBmp(int nglyph){
>FT_Bitmap bitmap;
>glyphSlot = face->glyph;
>  //Chargement de la fonte
>  Tracer::printInfo ("FTFont::RenderBmp numero de glyphe 
>"+QString::number(nglyph));
>  if (FT_Load_Glyph (face, nglyph, FT_LOAD_RENDER))
>    {
>
>        Tracer::printErr (  "FTFont::RenderBmp Le glyphe ne s'est pas 
>correctement chargé : numero de glyphe "+ QString::number(nglyph));
>    }
>    bitmap=face->glyph->bitmap;
>  if (bitmap.width)
>    {
>
>    Tracer::printErr (  "FTFont::RenderBmp Le glyphe  s'est correctement 
>chargé : numero de glyphe "+ QString::number(nglyph) +" taille 
>"+QString::number(nglyph) );
>    return     bitmap;
>    }
>
> else{Tracer::printErr (
>          "FTFont::renderBmp Le glyphe ne s'est pas correctement chargé 
>: numero de glyphe "+
>          QString::number(nglyph)+
>          ", Taille = "+
>          QString::number(face->glyph->bitmap.width)+
>          ", Hauteur = "+
>            QString::number(face->glyph->bitmap.rows)+
>          ", Pitch = "+
>            QString::number(face->glyph->bitmap.pitch)
>          );
>    return     bitmap;
>}
>///////////////END FUNCTION///////////////////////////
>
>Werner LEMBERG wrote:
>
>  
>
>>>I still met this problem, I am using version 2.1.7 under mips.
>>>   
>>>
>>>      
>>>
>>Unfortunately, I don't have access to this platform.
>>
>> 
>>
>>    
>>
>>>I buit the library with following commands.
>>> CC=mipsel-linux-gcc ./configure --host=mips --prefix=/opt
>>> make
>>> make install
>>>it builds successfully without too much warning.
>>>   
>>>
>>>      
>>>
>>Which warnings?  Please report them.
>>
>> 
>>
>>    
>>
>>>But when I use this libaray with the example1.c in the freetype
>>>tutorial 1 webpage. FT_Load_Glyph return -1 or not enough
>>>memory. sometimes it shows it need to allocate over 600MB memory. Of
>>>course it is not possible on my embedded board. Could anyone has a
>>>cule why it happens? Thanks.
>>>   
>>>
>>>      
>>>
>>Which font?  The only thing I can try is to run valgrind (on my PC),
>>checking memory leaks or invalid memory accesses.
>>
>>
>>   Werner
>>
>>_______________________________________________
>>Freetype mailing list
>>address@hidden
>>http://www.freetype.org/mailman/listinfo/freetype
>> 
>>
>>    
>>
>
>
>
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