Implement Linux Beauty

On Linux, the Facebetter SDK is accessed through the same C++ interface as Windows. This guide follows the C++ Desktop Demo as a reference.

Include Headers

#include <facebetter/beauty_effect_engine.h>
#include <facebetter/beauty_params.h>
#include <facebetter/image_frame.h>
#include <facebetter/type_defines.h>

using namespace facebetter;
using namespace facebetter::beauty_params;

Integration Overview

Configure logging → Create engine → Enable beauty types → Set params → Process frames → Render result

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1. Configure Logging (optional)

Call this before creating the engine.

LogConfig log_cfg;
log_cfg.console_enabled = true;
log_cfg.file_enabled    = false;
log_cfg.level           = LogLevel::Info;
BeautyEffectEngine::SetLogConfig(log_cfg);

Log levels (ascending): Trace / Debug / Info / Warn / Error / Critical.

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2. Create the Engine

EngineConfig eng_cfg;
eng_cfg.app_id           = "your_app_id";
eng_cfg.app_key          = "your_app_key";
eng_cfg.resource_path    = "resource/resource.fbd";
eng_cfg.external_context = false;

std::shared_ptr<BeautyEffectEngine> engine = BeautyEffectEngine::Create(eng_cfg);
if (!engine) {
    return -1;
}

At runtime, make sure libfacebetter.so is findable: place it next to the executable or point LD_LIBRARY_PATH to its directory.

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3. Enable Beauty Types

All beauty types are disabled by default and must be explicitly enabled:

engine->SetBeautyTypeEnabled(BeautyType::Basic,   true);
engine->SetBeautyTypeEnabled(BeautyType::Reshape, true);
engine->SetBeautyTypeEnabled(BeautyType::Makeup,  true);
engine->SetBeautyTypeEnabled(BeautyType::Sticker, true);

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4. Set Beauty Parameters

All parameter values are in [0.0, 1.0]. A value of 0 disables the effect.

Basic Beauty

engine->SetBeautyParam(Basic::Smoothing,  0.5f);
engine->SetBeautyParam(Basic::Whitening,  0.3f);
engine->SetBeautyParam(Basic::Rosiness,   0.2f);
engine->SetBeautyParam(Basic::Sharpening, 0.4f);

Skin-Only Beauty

Use SetSkinOnlyBeauty to set whether beauty effects are applied only to skin regions. When enabled, beauty effects (smoothing, whitening, etc.) will only be applied to detected skin areas, leaving non-skin areas unchanged.

// Enable skin-only beauty
engine->SetSkinOnlyBeauty(true);

// Disable skin-only beauty (apply to entire image)
engine->SetSkinOnlyBeauty(false);

TIP

After enabling skin-only beauty, even with high beauty parameter values, non-skin areas (such as background, clothing, etc.) will not be affected.

Face Reshape

engine->SetBeautyParam(Reshape::FaceThin,    0.4f);
engine->SetBeautyParam(Reshape::FaceVShape,  0.3f);
engine->SetBeautyParam(Reshape::FaceNarrow,  0.2f);
engine->SetBeautyParam(Reshape::FaceShort,   0.2f);
engine->SetBeautyParam(Reshape::Cheekbone,   0.3f);
engine->SetBeautyParam(Reshape::Jawbone,     0.2f);
engine->SetBeautyParam(Reshape::Chin,        0.2f);
engine->SetBeautyParam(Reshape::NoseSlim,    0.3f);
engine->SetBeautyParam(Reshape::EyeSize,     0.4f);
engine->SetBeautyParam(Reshape::EyeDistance, 0.1f);

Makeup

engine->SetBeautyParam(Makeup::Lipstick, 0.6f);
engine->SetBeautyParam(Makeup::Blush,    0.4f);

Stickers

engine->SetSticker("rabbit");  // enable sticker
engine->SetSticker("");        // disable sticker

Filters (LUT)

engine->SetFilter("chuxin");
engine->SetFilterIntensity(0.8f);
engine->SetFilter("");  // disable filter

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5. Process Frames

// Create input frame from in-memory RGBA data
auto input_frame = ImageFrame::CreateWithRGBA(
    rgba_data, width, height, stride);
input_frame->type = FrameType::Video;

auto output_frame = engine->ProcessImage(input_frame);

if (output_frame && output_frame->Data()) {
    const uint8_t* data = output_frame->Data();
    int w = output_frame->Width();
    int h = output_frame->Height();
}

Load from file (single-image mode):

auto input_frame  = ImageFrame::CreateWithFile("input.jpg");
input_frame->type = FrameType::Image;
auto output_frame = engine->ProcessImage(input_frame);

Convert output format if needed:

auto bgra_frame = output_frame->Convert(Format::BGRA);
auto i420_frame = output_frame->Convert(Format::I420);

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6. OpenGL Integration (render preview)

// Create texture (once)
GLuint tex;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

// Upload per frame
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
             output_frame->Width(), output_frame->Height(),
             0, GL_RGBA, GL_UNSIGNED_BYTE, output_frame->Data());

// Render with ImGui
ImGui::Image(
    static_cast<ImTextureID>(static_cast<intptr_t>(tex)),
    ImVec2(img_w, img_h));

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7. Full Example (real-time processing loop)

#include <facebetter/beauty_effect_engine.h>
#include <facebetter/beauty_params.h>
#include <facebetter/image_frame.h>
#include <glad/glad.h>
#include <GLFW/glfw3.h>

using namespace facebetter;
using namespace facebetter::beauty_params;

// Initialization
LogConfig log_cfg;
log_cfg.console_enabled = true;
log_cfg.level = LogLevel::Info;
BeautyEffectEngine::SetLogConfig(log_cfg);

EngineConfig eng_cfg;
eng_cfg.app_id           = "your_app_id";
eng_cfg.app_key          = "your_app_key";
eng_cfg.resource_path    = "resource/resource.fbd";
eng_cfg.external_context = false;

auto engine = BeautyEffectEngine::Create(eng_cfg);
engine->SetBeautyTypeEnabled(BeautyType::Basic,   true);
engine->SetBeautyTypeEnabled(BeautyType::Reshape, true);
engine->SetBeautyTypeEnabled(BeautyType::Makeup,  true);
engine->SetBeautyTypeEnabled(BeautyType::Sticker, true);

engine->SetBeautyParam(Basic::Smoothing,  0.5f);
engine->SetBeautyParam(Reshape::FaceThin, 0.4f);
engine->SetBeautyParam(Makeup::Lipstick,  0.6f);

// Processing loop (~30 fps)
double last_time = 0.0;
const double kInterval = 1.0 / 30.0;
GLuint preview_tex = 0;

while (!glfwWindowShouldClose(window)) {
    glfwPollEvents();
    double now = glfwGetTime();
    if (now - last_time >= kInterval) {
        auto input = ImageFrame::CreateWithRGBA(
            rgba_buffer, width, height, stride);
        input->type = FrameType::Video;

        auto output = engine->ProcessImage(input);
        if (output && output->Data()) {
            if (preview_tex == 0) {
                glGenTextures(1, &preview_tex);
                glBindTexture(GL_TEXTURE_2D, preview_tex);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            }
            glBindTexture(GL_TEXTURE_2D, preview_tex);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
                         output->Width(), output->Height(),
                         0, GL_RGBA, GL_UNSIGNED_BYTE, output->Data());
        }
        last_time = now;
    }
    // ... ImGui render ...
}

// Cleanup
if (preview_tex) glDeleteTextures(1, &preview_tex);
engine.reset();

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Quick Reference

The parameter enums and ImageFrame factory methods are identical to the Windows platform. See Windows – Implement Beauty for the full table.