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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.

2
imgui.h
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@ -1744,7 +1744,7 @@ IM_MSVC_RUNTIME_CHECKS_RESTORE
struct ImGuiStyle
{
float Alpha; // Global alpha applies to everything in Dear ImGui.
float DisabledAlpha; // Additional alpha multiplier for disabled items (multiply over current value of Alpha).
float DisabledAlpha; // Additional alpha multiplier applied by BeginDisabled(). Multiply over current value of Alpha.
ImVec2 WindowPadding; // Padding within a window.
float WindowRounding; // 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.
float WindowBorderSize; // Thickness of border around windows. Generally set to 0.0f or 1.0f. (Other values are not well tested and more CPU/GPU costly).

2
imgui_internal.h
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@ -1613,6 +1613,7 @@ struct ImGuiContext
bool DragCurrentAccumDirty;
float DragCurrentAccum; // Accumulator for dragging modification. Always high-precision, not rounded by end-user precision settings
float DragSpeedDefaultRatio; // If speed == 0.0f, uses (max-min) * DragSpeedDefaultRatio
float DisabledAlphaBackup; // Backup for style.Alpha for BeginDisabled()
float ScrollbarClickDeltaToGrabCenter; // Distance between mouse and center of grab box, normalized in parent space. Use storage?
int TooltipOverrideCount;
float TooltipSlowDelay; // Time before slow tooltips appears (FIXME: This is temporary until we merge in tooltip timer+priority work)
@ -1780,6 +1781,7 @@ struct ImGuiContext
DragCurrentAccumDirty = false;
DragCurrentAccum = 0.0f;
DragSpeedDefaultRatio = 1.0f / 100.0f;
DisabledAlphaBackup = 0.0f;
ScrollbarClickDeltaToGrabCenter = 0.0f;
TooltipOverrideCount = 0;
TooltipSlowDelay = 0.50f;