tests/unit_tests/renderer/feather_test.cpp

/*
 * Copyright 2025 Rive
 */

#include "common/render_context_null.hpp"
#include "rive/renderer/rive_renderer.hpp"
#include <catch.hpp>

namespace rive::gpu
{
// Ensures that a zero-area double cusp does not trigger assertions in the
// feathering code.
TEST_CASE("feathercusp", "[feather]")
{
  std::unique_ptr<RenderContext>
      renderContext = RenderContextNULL::MakeContext();

  renderContext->beginFrame({
      .renderTargetWidth = 1000,
      .renderTargetHeight = 1000,
  });

  auto path = renderContext->makeEmptyRenderPath();
  path->fillRule(FillRule::clockwise);
  path->moveTo(95.164070f, 799.999939f);
  path->cubicTo(
      -125.766922f,
      799.999939f,
      274.233032f,
      799.999939f,
      -95.164070f,
      799.999939f);

  auto paint = renderContext->makeRenderPaint();
  paint->color(0xffffffff);
  paint->feather(32);

  RiveRenderer renderer(renderContext.get());
  renderer.drawPath(path.get(), paint.get());

  auto renderTarget = renderContext->static_impl_cast<RenderContextNULL>()
                          ->makeRenderTarget(
                              renderContext->frameDescriptor()
                                  .renderTargetWidth,
                              renderContext->frameDescriptor()
                                  .renderTargetHeight);
  renderContext->flush({.renderTarget = renderTarget.get()});

  // The test passes if nothing crashes.
}
} // namespace rive::gpu