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authorDan Gudmundsson <[email protected]>2012-11-21 14:46:57 +0100
committerDan Gudmundsson <[email protected]>2013-01-09 11:44:29 +0100
commite0bd4e45ab947aef0600025d16d7df6502238e92 (patch)
treefccc7958856deac73c4d0f86521786e264a46970 /lib/observer/src
parentc2cfdee17a539de46345c4f9c2faf1dc03ccb596 (diff)
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observer: Fix check for graphics contexts
wxWidgets-2.9 seg faults if you try to create a graphics context before the window is shown. With bad timing this can happen. So change the haveGC test to check if the functionality is available without creating the GraphicsContext.
Diffstat (limited to 'lib/observer/src')
-rw-r--r--lib/observer/src/observer_app_wx.erl4
-rw-r--r--lib/observer/src/observer_perf_wx.erl9
2 files changed, 6 insertions, 7 deletions
diff --git a/lib/observer/src/observer_app_wx.erl b/lib/observer/src/observer_app_wx.erl
index b574307007..72bafcc5e0 100644
--- a/lib/observer/src/observer_app_wx.erl
+++ b/lib/observer/src/observer_app_wx.erl
@@ -28,7 +28,7 @@
-include("observer_defs.hrl").
%% Import drawing wrappers
--import(observer_perf_wx, [haveGC/1,
+-import(observer_perf_wx, [haveGC/0,
setPen/2, setFont/3, setBrush/2,
strokeLine/5, strokeLines/2, drawRoundedRectangle/6,
drawText/4, getTextExtent/2]).
@@ -114,7 +114,7 @@ init([Notebook, Parent]) ->
_ -> ok
end,
- UseGC = haveGC(DrawingArea),
+ UseGC = haveGC(),
Version28 = ?wxMAJOR_VERSION =:= 2 andalso ?wxMINOR_VERSION =:= 8,
Font = case os:type() of
{unix,_} when UseGC, Version28 ->
diff --git a/lib/observer/src/observer_perf_wx.erl b/lib/observer/src/observer_perf_wx.erl
index d0dd46b402..54c98f3ba3 100644
--- a/lib/observer/src/observer_perf_wx.erl
+++ b/lib/observer/src/observer_perf_wx.erl
@@ -24,7 +24,7 @@
handle_event/2, handle_sync_event/3, handle_cast/2]).
%% Drawing wrappers for DC and GC areas
--export([haveGC/1,
+-export([haveGC/0,
setPen/2, setFont/3, setBrush/2,
strokeLine/5, strokeLines/2, drawRoundedRectangle/6,
drawText/4, getTextExtent/2]).
@@ -90,7 +90,7 @@ init([Notebook, Parent]) ->
_ -> ok
end,
- UseGC = haveGC(Panel),
+ UseGC = haveGC(),
Version28 = ?wxMAJOR_VERSION =:= 2 andalso ?wxMINOR_VERSION =:= 8,
{Font, SmallFont}
= case os:type() of
@@ -525,10 +525,9 @@ colors() ->
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% wxDC and ?wxGC wrappers
-haveGC(Win) ->
+haveGC() ->
try
- GC = ?wxGC:create(Win),
- ?wxGC:destroy(GC),
+ wxGraphicsRenderer:getDefaultRenderer(),
true
catch _:_ -> false
end.