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imgui_widget_flamegraph.cpp
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// The MIT License(MIT)
//
// Copyright(c) 2019 Sandy Carter
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files(the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions :
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include <imgui_widget_flamegraph.h>
#include "imgui.h"
#include "imgui_internal.h"
void ImGuiWidgetFlameGraph::PlotFlame(const char* label, void (*values_getter)(float* start, float* end, ImU8* level, const char** caption, const void* data, int idx), const void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 graph_size)
{
ImGuiWindow* window = ImGui::GetCurrentWindow();
if (window->SkipItems)
return;
ImGuiContext& g = *GImGui;
const ImGuiStyle& style = g.Style;
// Find the maximum depth
ImU8 maxDepth = 0;
for (int i = values_offset; i < values_count; ++i)
{
ImU8 depth;
values_getter(nullptr, nullptr, &depth, nullptr, data, i);
maxDepth = ImMax(maxDepth, depth);
}
const auto blockHeight = ImGui::GetTextLineHeight() + (style.FramePadding.y * 2);
const ImVec2 label_size = ImGui::CalcTextSize(label, NULL, true);
if (graph_size.x == 0.0f)
graph_size.x = ImGui::CalcItemWidth();
if (graph_size.y == 0.0f)
graph_size.y = label_size.y + (style.FramePadding.y * 3) + blockHeight * (maxDepth + 1);
const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + graph_size);
const ImRect inner_bb(frame_bb.Min + style.FramePadding, frame_bb.Max - style.FramePadding);
const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0));
ImGui::ItemSize(total_bb, style.FramePadding.y);
if (!ImGui::ItemAdd(total_bb, 0, &frame_bb))
return;
// Determine scale from values if not specified
if (scale_min == FLT_MAX || scale_max == FLT_MAX)
{
float v_min = FLT_MAX;
float v_max = -FLT_MAX;
for (int i = values_offset; i < values_count; i++)
{
float v_start, v_end;
values_getter(&v_start, &v_end, nullptr, nullptr, data, i);
if (v_start == v_start) // Check non-NaN values
v_min = ImMin(v_min, v_start);
if (v_end == v_end) // Check non-NaN values
v_max = ImMax(v_max, v_end);
}
if (scale_min == FLT_MAX)
scale_min = v_min;
if (scale_max == FLT_MAX)
scale_max = v_max;
}
ImGui::RenderFrame(frame_bb.Min, frame_bb.Max, ImGui::GetColorU32(ImGuiCol_FrameBg), true, style.FrameRounding);
bool any_hovered = false;
if (values_count - values_offset >= 1)
{
const ImU32 col_base = ImGui::GetColorU32(ImGuiCol_PlotHistogram) & 0x77FFFFFF;
const ImU32 col_hovered = ImGui::GetColorU32(ImGuiCol_PlotHistogramHovered) & 0x77FFFFFF;
const ImU32 col_outline_base = ImGui::GetColorU32(ImGuiCol_PlotHistogram) & 0x7FFFFFFF;
const ImU32 col_outline_hovered = ImGui::GetColorU32(ImGuiCol_PlotHistogramHovered) & 0x7FFFFFFF;
for (int i = values_offset; i < values_count; ++i)
{
float stageStart, stageEnd;
ImU8 depth;
const char* caption;
values_getter(&stageStart, &stageEnd, &depth, &caption, data, i);
auto duration = scale_max - scale_min;
if (duration == 0)
{
return;
}
auto start = stageStart - scale_min;
auto end = stageEnd - scale_min;
auto startX = static_cast<float>(start / (double)duration);
auto endX = static_cast<float>(end / (double)duration);
float width = inner_bb.Max.x - inner_bb.Min.x;
float height = blockHeight * (maxDepth - depth + 1) - style.FramePadding.y;
auto pos0 = inner_bb.Min + ImVec2(startX * width, height);
auto pos1 = inner_bb.Min + ImVec2(endX * width, height + blockHeight);
bool v_hovered = false;
if (ImGui::IsMouseHoveringRect(pos0, pos1))
{
ImGui::SetTooltip("%s: %8.4g", caption, stageEnd - stageStart);
v_hovered = true;
any_hovered = v_hovered;
}
window->DrawList->AddRectFilled(pos0, pos1, v_hovered ? col_hovered : col_base);
window->DrawList->AddRect(pos0, pos1, v_hovered ? col_outline_hovered : col_outline_base);
auto textSize = ImGui::CalcTextSize(caption);
auto boxSize = (pos1 - pos0);
auto textOffset = ImVec2(0.0f, 0.0f);
if (textSize.x < boxSize.x)
{
textOffset = ImVec2(0.5f, 0.5f) * (boxSize - textSize);
ImGui::RenderText(pos0 + textOffset, caption);
}
}
// Text overlay
if (overlay_text)
ImGui::RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + style.FramePadding.y), frame_bb.Max, overlay_text, NULL, NULL, ImVec2(0.5f,0.0f));
if (label_size.x > 0.0f)
ImGui::RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, inner_bb.Min.y), label);
}
if (!any_hovered && ImGui::IsItemHovered())
{
ImGui::SetTooltip("Total: %8.4g", scale_max - scale_min);
}
}