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Title bar text uses cpu-clipping + comments

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ocornut 2015-02-08 16:39:34 +00:00
parent f84166dda9
commit b5e7648e24
1 changed files with 5 additions and 10 deletions
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15
imgui.cpp
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@ -2225,7 +2225,7 @@ ImVec2 ImGui::CalcTextSize(const char* text, const char* text_end, bool hide_tex
return text_size;
}
// Helper to calculate clipping of large list of evenly sized items.
// Helper to calculate coarse clipping of large list of evenly sized items.
// If you are displaying thousands of items and you have a random access to the list, you can perform clipping yourself to save on CPU.
// {
// float item_height = ImGui::GetTextLineHeightWithSpacing();
@ -2948,12 +2948,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, ImVec2 size, float fill_alph
const ImVec2 text_size = CalcTextSize(name, NULL, true);
const ImVec2 text_max = window->Pos + ImVec2(window->Size.x - (p_opened ? (title_bar_aabb.GetHeight()-3) : style.FramePadding.x), style.FramePadding.y + text_size.y);
const bool clip_title = text_size.x > (text_max.x - text_min.x); // only push a clip rectangle if we need to, because it may turn into a separate draw call // FIXME-OPT: CPU side clipping would work well for this kind of case.
if (clip_title)
PushClipRect(ImVec4(text_min.x, text_min.y, text_max.x, text_max.y));
RenderText(text_min, name);
if (clip_title)
PopClipRect();
RenderTextClipped(text_min, name, NULL, &text_size, text_max);
}
}
@ -8831,7 +8826,7 @@ static void ShowExampleAppLongText(bool* opened)
static ImGuiTextBuffer log;
static int lines = 0;
ImGui::Text("Printing unusually long amount of text.");
ImGui::Combo("Test type", &test_type, "Single call to TextUnformatted()\0Individual calls to Text(), clipped manually\0Individual calls to Text(), not clipped");
ImGui::Combo("Test type", &test_type, "Single call to TextUnformatted()\0Multiple calls to Text(), clipped manually\0Multiple calls to Text(), not clipped");
ImGui::Text("Buffer contents: %d lines, %d bytes", lines, log.size());
if (ImGui::Button("Clear")) { log.clear(); lines = 0; }
ImGui::SameLine();
@ -8849,7 +8844,7 @@ static void ShowExampleAppLongText(bool* opened)
ImGui::TextUnformatted(log.begin(), log.end());
break;
case 1:
// Individual calls to Text(), manually clipped - demonstrate how to use the CalcListClipping() helper.
// Multiple calls to Text(), manually coarsely clipped - demonstrate how to use the CalcListClipping() helper.
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0,0));
int display_start, display_end;
ImGui::CalcListClipping(lines, ImGui::GetTextLineHeight(), &display_start, &display_end);
@ -8860,7 +8855,7 @@ static void ShowExampleAppLongText(bool* opened)
ImGui::PopStyleVar();
break;
case 2:
// Individual calls to Text(), not clipped
// Multiple calls to Text(), not clipped
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0,0));
for (int i = 0; i < lines; i++)
ImGui::Text("%i The quick brown fox jumps over the lazy dog\n", i);