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ImDrawList: Additional comments and extracted bits into ImDrawList::PopUnusedDrawCmd()

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This commit is contained in:
ocornut
2020-06-08 18:21:10 +02:00
parent a6bb047bab
commit 117d57df5b
4 changed files with 22 additions and 12 deletions
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19
imgui_draw.cpp
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@ -437,6 +437,17 @@ void ImDrawList::AddDrawCmd()
CmdBuffer.push_back(draw_cmd);
}
// Pop trailing draw command (used before merging or presenting to user)
// Note that this leaves the ImDrawList in a state unfit for further commands, as most code assume that CmdBuffer.Size > 0 && CmdBuffer.back().UserCallback == NULL
void ImDrawList::PopUnusedDrawCmd()
{
if (CmdBuffer.Size == 0)
return;
ImDrawCmd* curr_cmd = &CmdBuffer.Data[CmdBuffer.Size - 1];
if (curr_cmd->ElemCount == 0 && curr_cmd->UserCallback == NULL)
CmdBuffer.pop_back();
}
void ImDrawList::AddCallback(ImDrawCallback callback, void* callback_data)
{
ImDrawCmd* curr_cmd = &CmdBuffer.Data[CmdBuffer.Size - 1];
@ -1362,13 +1373,12 @@ void ImDrawListSplitter::Split(ImDrawList* draw_list, int channels_count)
void ImDrawListSplitter::Merge(ImDrawList* draw_list)
{
// Note that we never use or rely on channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
// Note that we never use or rely on _Channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
if (_Count <= 1)
return;
SetCurrentChannel(draw_list, 0);
if (draw_list->CmdBuffer.Size != 0 && draw_list->CmdBuffer.back().ElemCount == 0)
draw_list->CmdBuffer.pop_back();
draw_list->PopUnusedDrawCmd();
// Calculate our final buffer sizes. Also fix the incorrect IdxOffset values in each command.
int new_cmd_buffer_count = 0;
@ -1378,8 +1388,11 @@ void ImDrawListSplitter::Merge(ImDrawList* draw_list)
for (int i = 1; i < _Count; i++)
{
ImDrawChannel& ch = _Channels[i];
// Equivalent of PopUnusedDrawCmd() for this channel's cmdbuffer and except we don't need to test for UserCallback.
if (ch._CmdBuffer.Size > 0 && ch._CmdBuffer.back().ElemCount == 0)
ch._CmdBuffer.pop_back();
if (ch._CmdBuffer.Size > 0 && last_cmd != NULL)
{
ImDrawCmd* next_cmd = &ch._CmdBuffer[0];