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Internals/experimental: BeginComboPreview(), EndComboPreview(). (#4168, #1658)

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(amended)
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ocornut
2021-06-15 15:16:39 +02:00
parent 98a6292165
commit 0cca0d1617
6 changed files with 101 additions and 3 deletions
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12
imgui_draw.cpp
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@ -491,6 +491,18 @@ void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
#define ImDrawCmd_HeaderCompare(CMD_LHS, CMD_RHS) (memcmp(CMD_LHS, CMD_RHS, ImDrawCmd_HeaderSize)) // Compare ClipRect, TextureId, VtxOffset
#define ImDrawCmd_HeaderCopy(CMD_DST, CMD_SRC) (memcpy(CMD_DST, CMD_SRC, ImDrawCmd_HeaderSize)) // Copy ClipRect, TextureId, VtxOffset
// Try to merge two last draw commands
void ImDrawList::_TryMergeDrawCmds()
{
ImDrawCmd* curr_cmd = &CmdBuffer.Data[CmdBuffer.Size - 1];
ImDrawCmd* prev_cmd = curr_cmd - 1;
if (ImDrawCmd_HeaderCompare(curr_cmd, prev_cmd) == 0 && curr_cmd->UserCallback == NULL && prev_cmd->UserCallback == NULL)
{
prev_cmd->ElemCount += curr_cmd->ElemCount;
CmdBuffer.pop_back();
}
}
// Our scheme may appears a bit unusual, basically we want the most-common calls AddLine AddRect etc. to not have to perform any check so we always have a command ready in the stack.
// The cost of figuring out if a new command has to be added or if we can merge is paid in those Update** functions only.
void ImDrawList::_OnChangedClipRect()