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DrawCmd: Added ForbidMerging boolean

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This commit is contained in:
Lou Catonnet 2025-11-05 14:28:15 +01:00
parent 1897248bda
commit 9b2647d112
3 changed files with 4 additions and 2 deletions
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3
imgui.cpp
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@ -5777,7 +5777,8 @@ static void ImGui::RenderDimmedBackgroundBehindWindow(ImGuiWindow* window, ImU32
ImDrawList* draw_list = window->RootWindow->DrawList;
if (draw_list->CmdBuffer.Size == 0)
draw_list->AddDrawCmd();
draw_list->PushClipRect(viewport_rect.Min - ImVec2(1, 1), viewport_rect.Max + ImVec2(1, 1), false); // FIXME: Need to stricty ensure ImDrawCmd are not merged (ElemCount==6 checks below will verify that)
draw_list->CmdBuffer.back().ForbidMerging = true; // Strictly ensure ImDrawCmd are not merged
draw_list->PushClipRect(viewport_rect.Min - ImVec2(1, 1), viewport_rect.Max + ImVec2(1, 1), false);
draw_list->AddRectFilled(viewport_rect.Min, viewport_rect.Max, col);
ImDrawCmd cmd = draw_list->CmdBuffer.back();
IM_ASSERT(cmd.ElemCount == 6);

1
imgui.h
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@ -3144,6 +3144,7 @@ struct ImDrawCmd
void* UserCallbackData; // 4-8 // Callback user data (when UserCallback != NULL). If called AddCallback() with size == 0, this is a copy of the AddCallback() argument. If called AddCallback() with size > 0, this is pointing to a buffer where data is stored.
int UserCallbackDataSize; // 4 // Size of callback user data when using storage, otherwise 0.
int UserCallbackDataOffset;// 4 // [Internal] Offset of callback user data when using storage, otherwise -1.
bool ForbidMerging; // 1 // Whether to allow merging with previous ImDrawCmd or not
ImDrawCmd() { memset(this, 0, sizeof(*this)); } // Also ensure our padding fields are zeroed

2
imgui_draw.cpp
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@ -587,7 +587,7 @@ void ImDrawList::_OnChangedClipRect()
// Try to merge with previous command if it matches, else use current command
ImDrawCmd* prev_cmd = curr_cmd - 1;
if (curr_cmd->ElemCount == 0 && CmdBuffer.Size > 1 && ImDrawCmd_HeaderCompare(&_CmdHeader, prev_cmd) == 0 && ImDrawCmd_AreSequentialIdxOffset(prev_cmd, curr_cmd) && prev_cmd->UserCallback == NULL)
if ((prev_cmd->ForbidMerging || curr_cmd->ForbidMerging) == false && curr_cmd->ElemCount == 0 && CmdBuffer.Size > 1 && ImDrawCmd_HeaderCompare(&_CmdHeader, prev_cmd) == 0 && ImDrawCmd_AreSequentialIdxOffset(prev_cmd, curr_cmd) && prev_cmd->UserCallback == NULL)
{
CmdBuffer.pop_back();
return;