ios - CGContext Errors only in simulator? -

while testing app bugs noticed in simulator when call 1 of functions set image uiimageview, bunch of cgcontext errors thrown , image never gets set. on devices (i have tested on iphone 5, iphone 3gs , ipad 3), none of these cgcontext errors come , image gets set fine.

anyway looked cgcontext code make happen , following methods involve cgcontext:

- (void)setcroprect:(cgrect)croprect {     if(!cgrectequaltorect(_croprect,croprect)){         _croprect = croprect;         uigraphicsbeginimagecontextwithoptions(self.bounds.size, no, 0.f);         cgcontextref context = uigraphicsgetcurrentcontext();         [[uicolor blackcolor] setfill];         uirectfill(self.bounds);         cgcontextsetstrokecolorwithcolor(context, [[uicolor whitecolor] colorwithalphacomponent:0.5].cgcolor);         cgcontextstrokerect(context, _croprect);         [[uicolor clearcolor] setfill];         uirectfill(cgrectinset(_croprect, 1, 1));         self.imageview.image = uigraphicsgetimagefromcurrentimagecontext();          uigraphicsendimagecontext();     } }  - (cgimageref)newscaledimage:(cgimageref)source withorientation:(uiimageorientation)orientation tosize:(cgsize)size withquality:(cginterpolationquality)quality {     cgsize srcsize = size;     cgfloat rotation = 0.0;      switch(orientation)     {         case uiimageorientationup: {             rotation = 0;         } break;         case uiimageorientationdown: {             rotation = m_pi;         } break;         case uiimageorientationleft:{             rotation = m_pi_2;             srcsize = cgsizemake(size.height, size.width);         } break;         case uiimageorientationright: {             rotation = -m_pi_2;             srcsize = cgsizemake(size.height, size.width);         } break;         default:             break;     }      cgcontextref context = cgbitmapcontextcreate(null,                                                  size.width,                                                  size.height,                                                  8, //cgimagegetbitspercomponent(source),                                                  0,                                                  cgimagegetcolorspace(source),                                                  kcgimagealphanoneskipfirst//cgimagegetbitmapinfo(source)                                                  );      cgcontextsetinterpolationquality(context, quality);     cgcontexttranslatectm(context,  size.width/2,  size.height/2);     cgcontextrotatectm(context,rotation);      cgcontextdrawimage(context, cgrectmake(-srcsize.width/2 ,                                            -srcsize.height/2,                                            srcsize.width,                                            srcsize.height),                        source);      cgimageref resultref = cgbitmapcontextcreateimage(context);     cgcontextrelease(context);      return resultref; }  - (cgimageref)newtransformedimage:(cgaffinetransform)transform                       sourceimage:(cgimageref)sourceimage                        sourcesize:(cgsize)sourcesize                 sourceorientation:(uiimageorientation)sourceorientation                       outputwidth:(cgfloat)outputwidth                          cropsize:(cgsize)cropsize                     imageviewsize:(cgsize)imageviewsize {     cgimageref source = [self newscaledimage:sourceimage                              withorientation:sourceorientation                                       tosize:sourcesize                                  withquality:kcginterpolationnone];      cgfloat aspect = cropsize.height/cropsize.width;     cgsize outputsize = cgsizemake(outputwidth, outputwidth*aspect);      cgcontextref context = cgbitmapcontextcreate(null,                                                  outputsize.width,                                                  outputsize.height,                                                  cgimagegetbitspercomponent(source),                                                  0,                                                  cgimagegetcolorspace(source),                                                  cgimagegetbitmapinfo(source));     cgcontextsetfillcolorwithcolor(context,  [[uicolor clearcolor] cgcolor]);     cgcontextfillrect(context, cgrectmake(0, 0, outputsize.width, outputsize.height));      cgaffinetransform uicoords = cgaffinetransformmakescale(outputsize.width/cropsize.width,                                                             outputsize.height/cropsize.height);     uicoords = cgaffinetransformtranslate(uicoords, cropsize.width/2.0, cropsize.height/2.0);     uicoords = cgaffinetransformscale(uicoords, 1.0, -1.0);     cgcontextconcatctm(context, uicoords);      cgcontextconcatctm(context, transform);     cgcontextscalectm(context, 1.0, -1.0);      cgcontextdrawimage(context, cgrectmake(-imageviewsize.width/2.0,                                            -imageviewsize.height/2.0,                                            imageviewsize.width,                                            imageviewsize.height)                        ,source);      cgimageref resultref = cgbitmapcontextcreateimage(context);     cgcontextrelease(context);     cgimagerelease(source);     return resultref; } 

these cgcontext errors:

jul 31 23:37:37 app[10190] <error>: cgbitmapcontextcreate: unsupported parameter combination: 8 integer bits/component; 16 bits/pixel; 1-component color space; kcgimagealphanoneskipfirst; 1504 bytes/row. jul 31 23:37:37 app[10190] <error>: cgcontextsetinterpolationquality: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontexttranslatectm: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextrotatectm: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextdrawimage: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgbitmapcontextcreateimage: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgbitmapcontextcreate: unsupported parameter combination: 0 integer bits/component; 0 bits/pixel; 0-component color space; kcgimagealphanone; 0 bytes/row. jul 31 23:37:37 app[10190] <error>: cgcontextsetfillcolorwithcolor: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextfillrects: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextconcatctm: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextconcatctm: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextscalectm: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgcontextdrawimage: invalid context 0x0 jul 31 23:37:37 app[10190] <error>: cgbitmapcontextcreateimage: invalid context 0x0 

those methods in app use cgcontexts. said, occurs in simulator , not on devices have tested on.

anyway, there particular reason or there way can fix this?

thanks all!

cgcontextref context = cgbitmapcontextcreate(null,                                                  size.width,                                                  size.height,                                                  cgimagegetbitspercomponent(source), //8,                                                  0,                                                  cgimagegetcolorspace(source),                                                  cgimagegetbitmapinfo //kcgimagealphanoneskipfirst(source)                                                  ); 

most likely, first call cgbitmapcontextcreate failing, because asking cannot do. can see in first error message:

cgbitmapcontextcreate: unsupported parameter combination: 8 integer bits/component; 16 bits/pixel; 1-component color space; kcgimagealphanoneskipfirst; 1504 bytes/row. 

cgbitmapcontextcreate returns null, , rest of failures cascade there. (you cannot operate on null context, , calling cgbitmapcontextgetimage() on null context gives null image, can't useful with.)

the documentation cgbitmapcontextcreate states:

for list of supported pixel formats, see “supported pixel formats” in “graphics contexts” chapter of quartz 2d programming guide.

here's direct link list.