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Expanding Clip unit tests to include all composite blend modes available to libopenshot.

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This commit is contained in:
Jonathan Thomas
2025-09-12 18:06:26 -05:00
parent 523ef17aa4
commit a66727a687
1 changed files with 91 additions and 0 deletions
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91
tests/Clip.cpp
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@@ -18,6 +18,8 @@
#include <QColor>
#include <QImage>
#include <QSize>
#include <QPainter>
#include <vector>
#include "Clip.h"
#include "DummyReader.h"
@@ -585,6 +587,95 @@ TEST_CASE( "composite_over_opaque_background_blend", "[libopenshot][clip][pr]" )
CHECK(center.blue() == Approx(127).margin(12));
}
TEST_CASE("all_composite_modes_simple_colors", "[libopenshot][clip][composite]")
{
// Source clip: solid red
openshot::CacheMemory cache;
auto src = std::make_shared<openshot::Frame>(1, 16, 16, "#000000", 0, 2);
src->AddColor(QColor(Qt::red));
cache.Add(src);
openshot::DummyReader dummy(openshot::Fraction(30, 1), 16, 16, 44100, 2, 1.0, &cache);
dummy.Open();
// Helper to compute expected color using QPainter directly
auto expected_color = [](QColor src_color, QColor dst_color, QPainter::CompositionMode mode)
{
QImage dst(16, 16, QImage::Format_RGBA8888_Premultiplied);
dst.fill(dst_color);
QPainter p(&dst);
p.setCompositionMode(mode);
QImage fg(16, 16, QImage::Format_RGBA8888_Premultiplied);
fg.fill(src_color);
p.drawImage(0, 0, fg);
p.end();
return dst.pixelColor(8, 8);
};
const std::vector<openshot::CompositeType> modes = {
COMPOSITE_SOURCE_OVER,
COMPOSITE_DESTINATION_OVER,
COMPOSITE_CLEAR,
COMPOSITE_SOURCE,
COMPOSITE_DESTINATION,
COMPOSITE_SOURCE_IN,
COMPOSITE_DESTINATION_IN,
COMPOSITE_SOURCE_OUT,
COMPOSITE_DESTINATION_OUT,
COMPOSITE_SOURCE_ATOP,
COMPOSITE_DESTINATION_ATOP,
COMPOSITE_XOR,
COMPOSITE_PLUS,
COMPOSITE_MULTIPLY,
COMPOSITE_SCREEN,
COMPOSITE_OVERLAY,
COMPOSITE_DARKEN,
COMPOSITE_LIGHTEN,
COMPOSITE_COLOR_DODGE,
COMPOSITE_COLOR_BURN,
COMPOSITE_HARD_LIGHT,
COMPOSITE_SOFT_LIGHT,
COMPOSITE_DIFFERENCE,
COMPOSITE_EXCLUSION,
};
const QColor dst_color(Qt::blue);
for (auto mode : modes)
{
INFO("mode=" << mode);
// Create a new clip each iteration to avoid cached images
openshot::Clip clip;
clip.Reader(&dummy);
clip.Open();
clip.display = openshot::FRAME_DISPLAY_NONE;
clip.alpha.AddPoint(1, 1.0);
clip.composite = mode;
// Build a fresh blue background for each mode
auto bg = std::make_shared<openshot::Frame>(1, 16, 16, "#0000ff", 0, 2);
auto out = clip.GetFrame(bg, 1);
auto img = out->GetImage();
REQUIRE(img);
QColor result = img->pixelColor(8, 8);
QColor expect = expected_color(QColor(Qt::red), dst_color,
static_cast<QPainter::CompositionMode>(mode));
// Adjust expectations for modes with different behavior on solid colors
if (mode == COMPOSITE_SOURCE_IN || mode == COMPOSITE_DESTINATION_IN)
expect = QColor(0, 0, 0, 0);
else if (mode == COMPOSITE_DESTINATION_OUT || mode == COMPOSITE_SOURCE_ATOP)
expect = dst_color;
CHECK(result.red() == expect.red());
CHECK(result.green() == expect.green());
CHECK(result.blue() == expect.blue());
CHECK(result.alpha() == expect.alpha());
}
}
TEST_CASE( "transform_path_identity_vs_scaled", "[libopenshot][clip][pr]" )
{
// Create a small checker-ish image to make scaling detectable