diff options
Diffstat (limited to 'src/drivers/GDI')
| -rw-r--r-- | src/drivers/GDI/Fl_GDI_Graphics_Driver.H | 11 | ||||
| -rw-r--r-- | src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx | 16 |
2 files changed, 24 insertions, 3 deletions
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.H b/src/drivers/GDI/Fl_GDI_Graphics_Driver.H index 6fa6840c8..941ac4db1 100644 --- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.H +++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.H @@ -182,7 +182,16 @@ private: Gdiplus::Color gdiplus_color_; Gdiplus::Pen *pen_; Gdiplus::SolidBrush *brush_; - static ULONG_PTR gdiplusToken; + // The code below ensures the a connection to GDIplus is only made once, and that the + // matching connection shutdown is also done exactly once. + enum { + STATE_CLOSED = 0, // no connection, token is invalid + STATE_STARTUP, // attempt to start up, avoid recursions for whatever reason + STATE_OPEN, // connection was successful and the token is valid + STATE_SHUTDOWN // shutting down the gdi connection, avoid possible recursion + }; + static int gdiplus_state_; // reflect the state of the GDIplus driver connection + static ULONG_PTR gdiplus_token_; // the token that GDIplus gives to us public: Fl_GDIplus_Graphics_Driver(); virtual ~Fl_GDIplus_Graphics_Driver(); diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx index 188bd1d2d..7897dce53 100644 --- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx +++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx @@ -53,10 +53,22 @@ int Fl_GDIplus_Graphics_Driver::antialias() { #if USE_GDIPLUS -ULONG_PTR Fl_GDIplus_Graphics_Driver::gdiplusToken = 0; +int Fl_GDIplus_Graphics_Driver::gdiplus_state_ = Fl_GDIplus_Graphics_Driver::STATE_CLOSED; +ULONG_PTR Fl_GDIplus_Graphics_Driver::gdiplus_token_ = 0; void Fl_GDIplus_Graphics_Driver::shutdown() { - Gdiplus::GdiplusShutdown(Fl_GDIplus_Graphics_Driver::gdiplusToken); + if (gdiplus_state_ == STATE_OPEN) { + gdiplus_state_ = STATE_SHUTDOWN; + Gdiplus::GdiplusShutdown(Fl_GDIplus_Graphics_Driver::gdiplus_token_); + gdiplus_token_ = 0; + gdiplus_state_ = STATE_CLOSED; + } else if (gdiplus_state_ == STATE_CLOSED) { +// Fl::warning("Fl_GDIplus_Graphics_Driver::shutdown() called, but driver is closed."); + } else if (gdiplus_state_ == STATE_SHUTDOWN) { +// Fl::warning("Fl_GDIplus_Graphics_Driver::shutdown() called recursively."); + } else if (gdiplus_state_ == STATE_STARTUP) { +// Fl::warning("Fl_GDIplus_Graphics_Driver::shutdown() called while driver is starting up."); + } } #endif |