Add paint brush parameter tests

2026-06-01 08:40:46 +02:00
parent 313a360c01
commit abe578a338
9 changed files with 256 additions and 7 deletions
--- a/tests/paint/brush_tests.cpp
+++ b/tests/paint/brush_tests.cpp
@@ -0,0 +1,127 @@
+#include "paint/brush.h"
+#include "test_harness.h"
+
+#include <cmath>
+
+using pp::foundation::StatusCode;
+using pp::paint::BrushParams;
+using pp::paint::evaluate_brush_stamp;
+using pp::paint::max_brush_size;
+using pp::paint::min_brush_size;
+using pp::paint::validate_brush_params;
+
+namespace {
+
+bool near(float a, float b)
+{
+    return std::fabs(a - b) < 0.0001F;
+}
+
+void accepts_default_and_boundary_params(pp::tests::Harness& h)
+{
+    BrushParams defaults;
+    BrushParams minimums {
+        .size = min_brush_size,
+        .spacing = 0.01F,
+        .opacity = 0.0F,
+        .flow = 0.0F,
+        .angle_degrees = -360.0F,
+        .size_jitter = 0.0F,
+        .opacity_jitter = 0.0F,
+    };
+    BrushParams maximums {
+        .size = max_brush_size,
+        .spacing = 16.0F,
+        .opacity = 1.0F,
+        .flow = 1.0F,
+        .angle_degrees = 360.0F,
+        .size_jitter = 1.0F,
+        .opacity_jitter = 1.0F,
+    };
+
+    PP_EXPECT(h, validate_brush_params(defaults).ok());
+    PP_EXPECT(h, validate_brush_params(minimums).ok());
+    PP_EXPECT(h, validate_brush_params(maximums).ok());
+}
+
+void rejects_invalid_params(pp::tests::Harness& h)
+{
+    BrushParams params;
+
+    params.size = 0.0F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.spacing = 0.0F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.opacity = -0.1F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.flow = 1.1F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.angle_degrees = 361.0F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.size_jitter = std::nanf("");
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+    params = BrushParams {};
+    params.opacity_jitter = 2.0F;
+    PP_EXPECT(h, validate_brush_params(params).code == StatusCode::out_of_range);
+}
+
+void evaluates_pressure_controlled_stamp(pp::tests::Harness& h)
+{
+    const BrushParams params {
+        .size = 20.0F,
+        .spacing = 0.5F,
+        .opacity = 0.8F,
+        .flow = 0.6F,
+        .angle_degrees = 45.0F,
+        .size_jitter = 0.0F,
+        .opacity_jitter = 0.0F,
+        .pressure_controls_size = true,
+        .pressure_controls_opacity = true,
+    };
+
+    const auto stamp = evaluate_brush_stamp(params, 0.5F);
+    PP_EXPECT(h, near(stamp.size, 10.0F));
+    PP_EXPECT(h, near(stamp.opacity, 0.4F));
+    PP_EXPECT(h, near(stamp.flow, 0.6F));
+    PP_EXPECT(h, near(stamp.angle_degrees, 45.0F));
+}
+
+void clamps_bad_pressure_and_applies_deterministic_jitter_scale(pp::tests::Harness& h)
+{
+    const BrushParams params {
+        .size = 20.0F,
+        .spacing = 0.5F,
+        .opacity = 0.8F,
+        .flow = 0.6F,
+        .angle_degrees = 0.0F,
+        .size_jitter = 0.5F,
+        .opacity_jitter = 1.0F,
+        .pressure_controls_size = false,
+        .pressure_controls_opacity = false,
+    };
+
+    const auto nan_pressure = evaluate_brush_stamp(params, std::nanf(""));
+    const auto high_pressure = evaluate_brush_stamp(params, 2.0F);
+
+    PP_EXPECT(h, near(nan_pressure.size, 15.0F));
+    PP_EXPECT(h, near(nan_pressure.opacity, 0.4F));
+    PP_EXPECT(h, near(high_pressure.size, 15.0F));
+    PP_EXPECT(h, near(high_pressure.opacity, 0.4F));
+}
+
+}
+
+int main()
+{
+    pp::tests::Harness harness;
+    harness.run("accepts_default_and_boundary_params", accepts_default_and_boundary_params);
+    harness.run("rejects_invalid_params", rejects_invalid_params);
+    harness.run("evaluates_pressure_controlled_stamp", evaluates_pressure_controlled_stamp);
+    harness.run("clamps_bad_pressure_and_applies_deterministic_jitter_scale", clamps_bad_pressure_and_applies_deterministic_jitter_scale);
+    return harness.finish();
+}