// Header
namespace ImGui
{
    bool ColoredButtonV1(const char* label, const ImVec2& size, ImU32 text_color, ImU32 bg_color_1, ImU32 bg_color_2);
}
#define IMGUI_DEFINE_MATH_OPERATORS
#include "imgui_internal.h"
// Implementation
bool ImGui::ColoredButtonV1(const char* label, const ImVec2& size_arg, ImU32 text_color, ImU32 bg_color_1, ImU32 bg_color_2)
{
    ImGuiWindow* window = GetCurrentWindow();
    if (window->SkipItems)
        return false;
    ImGuiContext& g = *GImGui;
    const ImGuiStyle& style = g.Style;
    const ImGuiID id = window->GetID(label);
    const ImVec2 label_size = CalcTextSize(label, NULL, true);
    ImVec2 pos = window->DC.CursorPos;
    ImVec2 size = CalcItemSize(size_arg, label_size.x + style.FramePadding.x * 2.0f, label_size.y + style.FramePadding.y * 2.0f);
    const ImRect bb(pos, pos + size);
    ItemSize(size, style.FramePadding.y);
    if (!ItemAdd(bb, id))
        return false;
    ImGuiButtonFlags flags = ImGuiButtonFlags_None;
    if (g.LastItemData.InFlags & ImGuiItemFlags_ButtonRepeat)
        flags |= ImGuiButtonFlags_Repeat;
    bool hovered, held;
    bool pressed = ButtonBehavior(bb, id, &hovered, &held, flags);
    // Render
    const bool is_gradient = bg_color_1 != bg_color_2;
    if (held || hovered)
    {
        // Modify colors (ultimately this can be prebaked in the style)
        float h_increase = (held && hovered) ? 0.02f : 0.02f;
        float v_increase = (held && hovered) ? 0.20f : 0.07f;
        ImVec4 bg1f = ColorConvertU32ToFloat4(bg_color_1);
        ColorConvertRGBtoHSV(bg1f.x, bg1f.y, bg1f.z, bg1f.x, bg1f.y, bg1f.z);
        bg1f.x = ImMin(bg1f.x + h_increase, 1.0f);
        bg1f.z = ImMin(bg1f.z + v_increase, 1.0f);
        ColorConvertHSVtoRGB(bg1f.x, bg1f.y, bg1f.z, bg1f.x, bg1f.y, bg1f.z);
        bg_color_1 = GetColorU32(bg1f);
        if (is_gradient)
        {
            ImVec4 bg2f = ColorConvertU32ToFloat4(bg_color_2);
            ColorConvertRGBtoHSV(bg2f.x, bg2f.y, bg2f.z, bg2f.x, bg2f.y, bg2f.z);
            bg2f.z = ImMin(bg2f.z + h_increase, 1.0f);
            bg2f.z = ImMin(bg2f.z + v_increase, 1.0f);
            ColorConvertHSVtoRGB(bg2f.x, bg2f.y, bg2f.z, bg2f.x, bg2f.y, bg2f.z);
            bg_color_2 = GetColorU32(bg2f);
        }
        else
        {
            bg_color_2 = bg_color_1;
        }
    }
    RenderNavHighlight(bb, id);
#if 0
    // V1 : faster but prevents rounding
    window->DrawList->AddRectFilledMultiColor(bb.Min, bb.Max, bg_color_1, bg_color_1, bg_color_2, bg_color_2);
    if (g.Style.FrameBorderSize > 0.0f)
        window->DrawList->AddRect(bb.Min, bb.Max, GetColorU32(ImGuiCol_Border), 0.0f, 0, g.Style.FrameBorderSize);
#endif
    // V2
    int vert_start_idx = window->DrawList->VtxBuffer.Size;
    window->DrawList->AddRectFilled(bb.Min, bb.Max, bg_color_1, g.Style.FrameRounding);
    int vert_end_idx = window->DrawList->VtxBuffer.Size;
    if (is_gradient)
        ShadeVertsLinearColorGradientKeepAlpha(window->DrawList, vert_start_idx, vert_end_idx, bb.Min, bb.GetBL(), bg_color_1, bg_color_2);
    if (g.Style.FrameBorderSize > 0.0f)
        window->DrawList->AddRect(bb.Min, bb.Max, GetColorU32(ImGuiCol_Border), g.Style.FrameRounding, 0, g.Style.FrameBorderSize);
    if (g.LogEnabled)
        LogSetNextTextDecoration("[", "]");
    PushStyleColor(ImGuiCol_Text, text_color);
    RenderTextClipped(bb.Min + style.FramePadding, bb.Max - style.FramePadding, label, NULL, &label_size, style.ButtonTextAlign, &bb);
    PopStyleColor();
    IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags);
    return pressed;
}

GradientButtonV1("Hello", ImVec2(-FLT_MIN, 0.0f), IM_COL32(255, 255, 255, 255), IM_COL32(200, 60, 60, 255), IM_COL32(180, 40, 90, 255));
GradientButtonV1("You", ImVec2(-FLT_MIN, 0.0f), IM_COL32(255, 255, 255, 255), IM_COL32(50, 220, 60, 255), IM_COL32(69, 150, 70, 255));