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Columns: Lower overhead on column switches and switching to background channel. (second attempt for 9b3ce49)

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Internals: Bits, comments, added ImRect::ToVec4()
This commit is contained in:
omar 2020-06-13 15:48:05 +02:00
parent d3b37180a3
commit 90c0c0c163
4 changed files with 46 additions and 17 deletions
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2
docs/CHANGELOG.txt
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@ -56,6 +56,8 @@ Other Changes:
BeginMenu()/EndMenu() or BeginPopup/EndPopup(). (#3223, #1207) [@rokups]
- Drag and Drop: Fixed unintended fallback "..." tooltip display during drag operation when
drag source uses _SourceNoPreviewTooltip flags. (#3160) [@rokups]
- Columns: Lower overhead on column switches and switching to background channel.
Benefits Columns but was primarily made with Tables in mind!
- ImDrawList: Fixed an issue where draw command merging or primitive unreserve while crossing the
VtxOffset boundary would lead to draw commands with wrong VtxOffset. (#3129, #3163, #3232, #2591)
[@thedmd, @Shironekoben, @sergeyn, @ocornut]

7
imgui.cpp
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@ -4169,7 +4169,12 @@ static void SetupDrawData(ImVector<ImDrawList*>* draw_lists, ImDrawData* draw_da
}
}
// When using this function it is sane to ensure that float are perfectly rounded to integer values, to that e.g. (int)(max.x-min.x) in user's render produce correct result.
// Push a clipping rectangle for both ImGui logic (hit-testing etc.) and low-level ImDrawList rendering.
// - When using this function it is sane to ensure that float are perfectly rounded to integer values,
// so that e.g. (int)(max.x-min.x) in user's render produce correct result.
// - If the code here changes, may need to update code of functions like NextColumn() and PushColumnClipRect():
// some frequently called functions which to modify both channels and clipping simultaneously tend to use the
// more specialized SetWindowClipRectBeforeSetChannel() to avoid extraneous updates of underlying ImDrawCmds.
void ImGui::PushClipRect(const ImVec2& clip_rect_min, const ImVec2& clip_rect_max, bool intersect_with_current_clip_rect)
{
ImGuiWindow* window = GetCurrentWindow();

5
imgui_internal.h
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@ -435,6 +435,7 @@ struct IMGUI_API ImRect
void ClipWithFull(const ImRect& r) { Min = ImClamp(Min, r.Min, r.Max); Max = ImClamp(Max, r.Min, r.Max); } // Full version, ensure both points are fully clipped.
void Floor() { Min.x = IM_FLOOR(Min.x); Min.y = IM_FLOOR(Min.y); Max.x = IM_FLOOR(Max.x); Max.y = IM_FLOOR(Max.y); }
bool IsInverted() const { return Min.x > Max.x || Min.y > Max.y; }
ImVec4 ToVec4() const { return ImVec4(Min.x, Min.y, Max.x, Max.y); }
};
// Helper: ImBitArray
@ -1012,7 +1013,8 @@ struct ImGuiColumns
float LineMinY, LineMaxY;
float HostCursorPosY; // Backup of CursorPos at the time of BeginColumns()
float HostCursorMaxPosX; // Backup of CursorMaxPos at the time of BeginColumns()
ImRect HostClipRect; // Backup of ClipRect at the time of BeginColumns()
ImRect HostInitialClipRect; // Backup of ClipRect at the time of BeginColumns()
ImRect HostBackupClipRect; // Backup of ClipRect during PushColumnsBackground()/PopColumnsBackground()
ImRect HostWorkRect; // Backup of WorkRect at the time of BeginColumns()
ImVector<ImGuiColumnData> Columns;
ImDrawListSplitter Splitter;
@ -1894,6 +1896,7 @@ namespace ImGui
IMGUI_API bool IsDragDropPayloadBeingAccepted();
// Internal Columns API (this is not exposed because we will encourage transitioning to the Tables API)
IMGUI_API void SetWindowClipRectBeforeSetChannel(ImGuiWindow* window, const ImRect& clip_rect);
IMGUI_API void BeginColumns(const char* str_id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().
IMGUI_API void EndColumns(); // close columns
IMGUI_API void PushColumnClipRect(int column_index);

49
imgui_widgets.cpp
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@ -7398,6 +7398,7 @@ bool ImGui::TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb,
// [SECTION] Widgets: Columns, BeginColumns, EndColumns, etc.
// In the current version, Columns are very weak. Needs to be replaced with a more full-featured system.
//-------------------------------------------------------------------------
// - SetWindowClipRectBeforeSetChannel() [Internal]
// - GetColumnIndex()
// - GetColumnCount()
// - GetColumnOffset()
@ -7415,6 +7416,18 @@ bool ImGui::TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb,
// - Columns()
//-------------------------------------------------------------------------
// [Internal] Small optimization to avoid calls to PopClipRect/SetCurrentChannel/PushClipRect in sequences,
// they would meddle many times with the underlying ImDrawCmd.
// Instead, we do a preemptive overwrite of clipping rectangle _without_ altering the command-buffer and let
// the subsequent single call to SetCurrentChannel() does it things once.
void ImGui::SetWindowClipRectBeforeSetChannel(ImGuiWindow* window, const ImRect& clip_rect)
{
ImVec4 clip_rect_vec4 = clip_rect.ToVec4();
window->ClipRect = clip_rect;
window->DrawList->_CmdHeader.ClipRect = clip_rect_vec4;
window->DrawList->_ClipRectStack.Data[window->DrawList->_ClipRectStack.Size - 1] = clip_rect_vec4;
}
int ImGui::GetColumnIndex()
{
ImGuiWindow* window = GetCurrentWindowRead();
@ -7549,11 +7562,11 @@ void ImGui::PushColumnsBackground()
ImGuiColumns* columns = window->DC.CurrentColumns;
if (columns->Count == 1)
return;
// Optimization: avoid SetCurrentChannel() + PushClipRect()
columns->HostBackupClipRect = window->ClipRect;
SetWindowClipRectBeforeSetChannel(window, columns->HostInitialClipRect);
columns->Splitter.SetCurrentChannel(window->DrawList, 0);
int cmd_size = window->DrawList->CmdBuffer.Size;
PushClipRect(columns->HostClipRect.Min, columns->HostClipRect.Max, false);
IM_UNUSED(cmd_size);
IM_ASSERT(cmd_size >= window->DrawList->CmdBuffer.Size); // Being in channel 0 this should not have created an ImDrawCmd
}
void ImGui::PopColumnsBackground()
@ -7562,8 +7575,10 @@ void ImGui::PopColumnsBackground()
ImGuiColumns* columns = window->DC.CurrentColumns;
if (columns->Count == 1)
return;
// Optimization: avoid PopClipRect() + SetCurrentChannel()
SetWindowClipRectBeforeSetChannel(window, columns->HostBackupClipRect);
columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
PopClipRect();
}
ImGuiColumns* ImGui::FindOrCreateColumns(ImGuiWindow* window, ImGuiID id)
@ -7611,7 +7626,7 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
columns->HostCursorPosY = window->DC.CursorPos.y;
columns->HostCursorMaxPosX = window->DC.CursorMaxPos.x;
columns->HostClipRect = window->ClipRect;
columns->HostInitialClipRect = window->ClipRect;
columns->HostWorkRect = window->WorkRect;
// Set state for first column
@ -7683,25 +7698,31 @@ void ImGui::NextColumn()
IM_ASSERT(columns->Current == 0);
return;
}
// Next column
if (++columns->Current == columns->Count)
columns->Current = 0;
PopItemWidth();
PopClipRect();
// Optimization: avoid PopClipRect() + SetCurrentChannel() + PushClipRect()
// (which would needlessly attempt to update commands in the wrong channel, then pop or overwrite them),
ImGuiColumnData* column = &columns->Columns[columns->Current];
SetWindowClipRectBeforeSetChannel(window, column->ClipRect);
columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
const float column_padding = g.Style.ItemSpacing.x;
columns->LineMaxY = ImMax(columns->LineMaxY, window->DC.CursorPos.y);
if (++columns->Current < columns->Count)
if (columns->Current > 0)
{
// Columns 1+ ignore IndentX (by canceling it out)
// FIXME-COLUMNS: Unnecessary, could be locked?
window->DC.ColumnsOffset.x = GetColumnOffset(columns->Current) - window->DC.Indent.x + column_padding;
columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
}
else
{
// New row/line
// Column 0 honor IndentX
// New row/line: column 0 honor IndentX.
window->DC.ColumnsOffset.x = ImMax(column_padding - window->WindowPadding.x, 0.0f);
columns->Splitter.SetCurrentChannel(window->DrawList, 1);
columns->Current = 0;
columns->LineMinY = columns->LineMaxY;
}
window->DC.CursorPos.x = IM_FLOOR(window->Pos.x + window->DC.Indent.x + window->DC.ColumnsOffset.x);
@ -7709,8 +7730,6 @@ void ImGui::NextColumn()
window->DC.CurrLineSize = ImVec2(0.0f, 0.0f);
window->DC.CurrLineTextBaseOffset = 0.0f;
PushColumnClipRect(columns->Current); // FIXME-COLUMNS: Could it be an overwrite?
// FIXME-COLUMNS: Share code with BeginColumns() - move code on columns setup.
float offset_0 = GetColumnOffset(columns->Current);
float offset_1 = GetColumnOffset(columns->Current + 1);