82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
#include "Document/BrushStroke.h"
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#include "Rendering/TiledLayerRenderer.h"
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#include <QPainter>
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#include <QtTest>
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// Compositor 1.4's sharper canvas: upright layers at 1:1 copy across.
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namespace {
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// Black and white columns, opaque, 100 by 4.
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QImage columns()
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{
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QImage image = BrushRaster::context(100, 4, false);
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for (int y = 0; y < 4; ++y) {
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for (int x = 0; x < 100; ++x)
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image.setPixel(x, y, x % 2 ? qRgba(255, 255, 255, 255) : qRgba(0, 0, 0, 255));
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}
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return image;
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}
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using Draw = std::function<void(const LayerTransform &, QPainter &)>;
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// Pixels under the layer neither black nor white.
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int blurred(double width, const Draw &draw)
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{
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QImage surface = BrushRaster::context(120, 4, false);
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QPainter painter(&surface);
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draw(LayerTransform{.origin = {0, 0}, .size = {width, 4}}, painter);
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painter.end();
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int count = 0;
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for (int y = 0; y < 4; ++y) {
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for (int x = 0; x < 100; ++x)
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count += qRed(surface.pixel(x, y)) % 255 != 0;
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}
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return count;
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}
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}
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class SharpCanvasTests : public QObject {
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Q_OBJECT
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private slots:
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void anUprightLayerPixelForPixelTakesNoFilter();
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void plainMaskedAndTiledLayersCopyAcross();
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};
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void SharpCanvasTests::anUprightLayerPixelForPixelTakesNoFilter()
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{
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for (LayerSampling sampling : {LayerSampling::smooth, LayerSampling::high}) {
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QCOMPARE(LayerRenderer::interpolation(sampling, 1.0009, true), InterpolationQuality::none);
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QCOMPARE(LayerRenderer::interpolation(sampling, 0.9991, true), InterpolationQuality::none);
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QCOMPARE(LayerRenderer::interpolation(sampling, 0.9989, true), InterpolationQuality::low);
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QCOMPARE(LayerRenderer::interpolation(sampling, 1, false), InterpolationQuality::low);
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}
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QCOMPARE(LayerRenderer::interpolation(LayerSampling::high, 1.0011, true), InterpolationQuality::high);
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QCOMPARE(LayerRenderer::interpolation(LayerSampling::high, 1.0009, false), InterpolationQuality::high);
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QCOMPARE(LayerRenderer::interpolation(LayerSampling::nearest, 1.5, true), InterpolationQuality::none);
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}
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void SharpCanvasTests::plainMaskedAndTiledLayersCopyAcross()
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{
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const QImage image = columns();
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QImage white = BrushRaster::context(100, 4, true);
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white.fill(255);
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const auto raster = std::make_shared<const RasterSnapshot>(100, 4, image, QRectF(0, 0, 100, 4), std::vector<BrushPatch>{});
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const std::vector<Draw> draws{
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[&](const LayerTransform &transform, QPainter &painter) { LayerRenderer::draw(image, transform, transform.center(), painter); },
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[&](const LayerTransform &transform, QPainter &painter) {
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LayerRenderer::draw(image, transform, transform.center(), painter, {.mask = white});
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},
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[&](const LayerTransform &transform, QPainter &painter) {
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TiledLayerRenderer::drawRaster(raster, transform, transform.center(), painter);
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},
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};
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for (const Draw &draw : draws) {
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// A twentieth of a pixel over 100: within tolerance, crisp.
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QCOMPARE(blurred(100.05, draw), 0);
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// A fifth: filtered as before.
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QVERIFY(blurred(100.2, draw) > 0);
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}
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}
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QTEST_GUILESS_MAIN(SharpCanvasTests)
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#include "SharpCanvasTests.moc"
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