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Small optimizations to BeginDisabled() to allow frequent calls (#211)

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Not intended for frequent calls but I suspect some people will do it either way...
Rough/indicative: measured 0.1 ms for 5000 calls in release, 0.5 ms in debug on my desktop windows.
This commit is contained in:
ocornut
2021-08-20 16:56:13 +02:00
parent c543d93af1
commit df2319a854
3 changed files with 17 additions and 6 deletions
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19
imgui.cpp
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@ -989,7 +989,7 @@ static void* GImAllocatorUserData = NULL;
ImGuiStyle::ImGuiStyle()
{
Alpha = 1.0f; // Global alpha applies to everything in Dear ImGui.
DisabledAlpha = 0.60f; // Additional alpha multiplier for disabled items (multiply over current value of Alpha).
DisabledAlpha = 0.60f; // Additional alpha multiplier applied by BeginDisabled(). Multiply over current value of Alpha.
WindowPadding = ImVec2(8,8); // Padding within a window
WindowRounding = 0.0f; // Radius of window corners rounding. Set to 0.0f to have rectangular windows. Large values tend to lead to variety of artifacts and are not recommended.
WindowBorderSize = 1.0f; // Thickness of border around windows. Generally set to 0.0f or 1.0f. Other values not well tested.
@ -6622,22 +6622,31 @@ void ImGui::PopItemFlag()
// - Visually this is currently altering alpha, but it is expected that in a future styling system this would work differently.
// - Feedback welcome at https://github.com/ocornut/imgui/issues/211
// - BeginDisabled(false) essentially does nothing but is provided to facilitate use of boolean expressions
// - Optimized shortcuts instead of PushStyleVar() + PushItemFlag()
void ImGui::BeginDisabled(bool disabled)
{
ImGuiContext& g = *GImGui;
bool was_disabled = (g.CurrentItemFlags & ImGuiItemFlags_Disabled) != 0;
if (!was_disabled && disabled)
PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * g.Style.DisabledAlpha);
PushItemFlag(ImGuiItemFlags_Disabled, was_disabled || disabled);
{
//PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * g.Style.DisabledAlpha);
g.DisabledAlphaBackup = g.Style.Alpha;
g.Style.Alpha *= g.Style.DisabledAlpha;
}
//PushItemFlag(ImGuiItemFlags_Disabled, was_disabled || disabled);
g.CurrentItemFlags |= ImGuiItemFlags_Disabled;
g.ItemFlagsStack.push_back(g.CurrentItemFlags);
}
void ImGui::EndDisabled()
{
ImGuiContext& g = *GImGui;
bool was_disabled = (g.CurrentItemFlags & ImGuiItemFlags_Disabled) != 0;
PopItemFlag();
//PopItemFlag();
g.ItemFlagsStack.pop_back();
g.CurrentItemFlags &= ~ImGuiItemFlags_Disabled;
if (was_disabled && (g.CurrentItemFlags & ImGuiItemFlags_Disabled) == 0)
PopStyleVar();
g.Style.Alpha = g.DisabledAlphaBackup; //PopStyleVar();
}
// FIXME: Look into renaming this once we have settled the new Focus/Activation/TabStop system.