OmaPhoto 1.0.0: the Linux port of Compositor
A layered image editor for Linux and Omarchy, ported from Compositor (github.com/robbietilton/Compositor), whose Swift source is its specification. It reads and writes Compositor's .comp projects. Packages for Ubuntu, Fedora and Arch come from the release workflow; scripts/install/ holds one install script per distribution family, and flake.nix serves NixOS. Co-Authored-By: Claude <noreply@anthropic.com>
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#include "Document/Distort.h"
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#include "Document/BrushStroke.h"
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#include "Document/EditorSession.h"
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#include "Document/LayerEffects+Renderer.h"
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#include "Document/PixelAdjust.h"
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#include "IO/ImageExporter.h"
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#include "IO/ProjectStore.h"
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#include <QPainterPath>
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#include <QPolygonF>
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#include <QRegion>
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#include <cmath>
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#include <functional>
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extern "C" {
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#include "BrushPixels.h"
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}
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namespace {
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// Swift divides by w whatever its sign; Qt 6.11 clips.
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QPointF project(const QTransform &map, QPointF point)
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{
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const double w = map.m13() * point.x() + map.m23() * point.y() + map.m33();
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return QPointF((map.m11() * point.x() + map.m21() * point.y() + map.m31()) / w, (map.m12() * point.x() + map.m22() * point.y() + map.m32()) / w);
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}
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double area(QPointF a, QPointF b, QPointF c)
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{
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return (b.x() - a.x()) * (c.y() - a.y()) - (b.y() - a.y()) * (c.x() - a.x());
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}
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using Triangle = std::array<QPointF, 3>;
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// The affine map taking three points to three others.
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std::optional<QTransform> affine(const Triangle &source, const Triangle &target)
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{
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const QPointF u = source[1] - source[0], v = source[2] - source[0];
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const QPointF uu = target[1] - target[0], vv = target[2] - target[0];
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const double det = u.x() * v.y() - v.x() * u.y();
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if (std::abs(det) <= 1e-9)
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return std::nullopt;
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const double a = (uu.x() * v.y() - vv.x() * u.y()) / det, c = (vv.x() * u.x() - uu.x() * v.x()) / det;
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const double b = (uu.y() * v.y() - vv.y() * u.y()) / det, d = (vv.y() * u.x() - uu.y() * v.x()) / det;
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return QTransform(a, b, c, d, target[0].x() - (a * source[0].x() + c * source[0].y()), target[0].y() - (b * source[0].x() + d * source[0].y()));
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}
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struct Target {
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QPointF topLeft, topRight, bottomRight, bottomLeft;
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};
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// A flipped layer's pixels go to the opposite corners.
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Target imageCorners(const Corners &corners, bool flipX, bool flipY)
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{
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const auto corner = [&](int x, int y) {
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const int u = flipX ? 1 - x : x, v = flipY ? 1 - y : y;
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return corners[size_t(std::array<int, 4>{0, 1, 3, 2}[size_t(v * 2 + u)])];
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};
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return {corner(0, 0), corner(1, 0), corner(1, 1), corner(0, 1)};
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}
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QRectF shapeBounds(const Corners &corners)
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{
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QPointF low = corners[0], high = corners[0];
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for (const QPointF corner : corners) {
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low = {std::min(low.x(), corner.x()), std::min(low.y(), corner.y())};
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high = {std::max(high.x(), corner.x()), std::max(high.y(), corner.y())};
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}
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return QRectF(QPointF(std::floor(low.x()), std::floor(low.y())), QPointF(std::ceil(high.x()), std::ceil(high.y())));
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}
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// Pixels whose centres a triangle holds, left bound inclusive.
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QRegion triangleRegion(const Triangle &triangle)
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{
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QRegion region;
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const double top = std::min({triangle[0].y(), triangle[1].y(), triangle[2].y()});
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const double bottom = std::max({triangle[0].y(), triangle[1].y(), triangle[2].y()});
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for (int row = int(std::ceil(top - 0.5)); row + 0.5 < bottom; ++row) {
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const double y = row + 0.5;
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std::optional<double> left, right;
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for (size_t index = 0; index < 3; ++index) {
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// Ends ordered by y: a shared edge gives one x.
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const QPointF a = std::min(triangle[index], triangle[(index + 1) % 3], [](QPointF p, QPointF q) { return p.y() < q.y(); });
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const QPointF b = a == triangle[index] ? triangle[(index + 1) % 3] : triangle[index];
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// An edge holds its lower end, not its upper one.
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if (a.y() == b.y() || y < a.y() || y >= b.y())
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continue;
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const double x = a.x() + (b.x() - a.x()) * (y - a.y()) / (b.y() - a.y());
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left = std::min(left.value_or(x), x);
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right = std::max(right.value_or(x), x);
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}
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if (!left)
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continue;
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const int first = int(std::ceil(*left - 0.5)), last = int(std::ceil(*right - 0.5)) - 1;
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if (last >= first)
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region += QRect(first, row, last - first + 1, 1);
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}
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return region;
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}
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// A folded shape: each half by its own affine map.
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void warpFolded(const QImage &image, const Target &target, const std::function<QPointF(QPointF)> &place, QPainter &painter)
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{
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const QRectF source(0, 0, image.width(), image.height());
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const std::array<std::pair<Triangle, Triangle>, 2> halves = {
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std::pair{Triangle{source.topLeft(), source.topRight(), source.bottomRight()}, Triangle{place(target.topLeft), place(target.topRight), place(target.bottomRight)}},
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std::pair{Triangle{source.topLeft(), source.bottomRight(), source.bottomLeft()}, Triangle{place(target.topLeft), place(target.bottomRight), place(target.bottomLeft)}}};
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for (const auto &[from, to] : halves) {
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const std::optional<QTransform> map = affine(from, to);
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if (!map)
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continue;
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painter.save();
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// A hard region along the diagonal: the halves meet exactly.
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painter.setClipRegion(triangleRegion(to));
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painter.setTransform(*map);
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BrushRaster::draw(image, source, painter);
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painter.restore();
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}
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}
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}
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Corners DistortWarp::corners(const LayerTransform &transform)
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{
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return {transform.point({0, 0}), transform.point({1, 0}), transform.point({1, 1}), transform.point({0, 1})};
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}
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bool DistortWarp::isUsable(const Corners &corners)
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{
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for (const QPointF corner : corners) {
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if (!std::isfinite(corner.x()) || !std::isfinite(corner.y()) || std::abs(corner.x()) > 1'000'000 || std::abs(corner.y()) > 1'000'000)
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return false;
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}
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// Both halves need area, or one has nothing to draw.
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return std::abs(area(corners[0], corners[1], corners[2])) > 0.01 && std::abs(area(corners[0], corners[2], corners[3])) > 0.01;
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}
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bool DistortWarp::isConvex(const Corners &corners)
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{
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if (!isUsable(corners))
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return false;
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double sign = 0;
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for (size_t index = 0; index < 4; ++index) {
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const QPointF a = corners[index], b = corners[(index + 1) % 4], c = corners[(index + 2) % 4];
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const double cross = (b.x() - a.x()) * (c.y() - b.y()) - (b.y() - a.y()) * (c.x() - b.x());
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if (std::abs(cross) <= 0.01)
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return false;
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if (sign == 0)
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sign = cross < 0 ? -1 : 1;
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else if ((cross < 0) != (sign < 0))
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return false;
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}
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return true;
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}
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QTransform DistortWarp::homography(const Corners &c)
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{
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const double sx = c[0].x() - c[1].x() + c[2].x() - c[3].x(), sy = c[0].y() - c[1].y() + c[2].y() - c[3].y();
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double g = 0, h = 0;
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if (std::abs(sx) > 1e-9 || std::abs(sy) > 1e-9) {
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const double dx1 = c[1].x() - c[2].x(), dx2 = c[3].x() - c[2].x(), dy1 = c[1].y() - c[2].y(), dy2 = c[3].y() - c[2].y();
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const double den = dx1 * dy2 - dx2 * dy1;
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if (std::abs(den) > 1e-12) {
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g = (sx * dy2 - dx2 * sy) / den;
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h = (dx1 * sy - sx * dy1) / den;
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}
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}
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const double a = c[1].x() - c[0].x() + g * c[1].x(), b = c[3].x() - c[0].x() + h * c[3].x();
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const double d = c[1].y() - c[0].y() + g * c[1].y(), e = c[3].y() - c[0].y() + h * c[3].y();
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// Qt divides by the third row, as Swift by w.
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return QTransform(a, d, g, b, e, h, c[0].x(), c[0].y(), 1);
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}
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DistortWarp::Warped DistortWarp::warp(const QImage &image, const LayerTransform &transform, const Corners &corners, bool isMask,
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std::optional<double> limit)
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{
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if (!isUsable(corners))
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throw ProjectError(ProjectError::Kind::invalid);
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const QRectF bounds = shapeBounds(corners);
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if (bounds.width() < 1 || bounds.height() < 1 || bounds.width() > 30'000 || bounds.height() > 30'000 || bounds.width() * bounds.height() > 100'000'000)
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throw ProjectError(ProjectError::Kind::tooLarge);
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const LayerTransform placed{.origin = bounds.topLeft(), .size = bounds.size(), .sampling = transform.sampling};
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// A uniform 1 × 1 mask already covers any shape.
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if (isMask && image.width() == 1 && image.height() == 1)
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return {image, placed};
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const double factor = limit ? std::min(1.0, *limit / std::max(bounds.width(), bounds.height())) : 1;
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const int width = std::max(1, int(std::ceil(bounds.width() * factor))), height = std::max(1, int(std::ceil(bounds.height() * factor)));
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const Target target = imageCorners(corners, transform.flipX, transform.flipY);
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const auto place = [&](QPointF point) { return QPointF((point.x() - bounds.left()) * factor, (point.y() - bounds.top()) * factor); };
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QImage surface = BrushRaster::context(width, height, isMask);
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QPainter painter(&surface);
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painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
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if (!isConvex(corners)) {
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warpFolded(image, target, place, painter);
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return {surface, placed};
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}
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const QRectF source(0, 0, image.width(), image.height());
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QTransform map;
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if (!QTransform::quadToQuad(QPolygonF({source.topLeft(), source.topRight(), source.bottomRight(), source.bottomLeft()}),
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QPolygonF({place(target.topLeft), place(target.topRight), place(target.bottomRight), place(target.bottomLeft)}), map))
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throw ExportError(ExportError::Kind::render);
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painter.setTransform(map);
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painter.drawImage(source, image);
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return {surface, placed};
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}
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DistortWarp::Trimmed DistortWarp::warpTrimmed(const QImage &image, const LayerTransform &transform, const Corners &corners)
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{
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const Warped warped = warp(image, transform, corners, false);
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const QRect full = warped.image.rect();
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size_t edges[4] = {0, 0, 0, 0};
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brush_alpha_bounds(warped.image.constBits(), size_t(full.width()), size_t(full.height()), size_t(warped.image.bytesPerLine()), edges);
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const QRect crop(int(edges[0]), int(edges[1]), int(edges[2] - edges[0]), int(edges[3] - edges[1]));
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// Nothing visible, or nothing to trim: the warp itself.
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if (crop.width() < 1 || crop.height() < 1 || crop == full)
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return {warped.image, warped.transform, full};
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LayerTransform placed = warped.transform;
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placed.origin += crop.topLeft();
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placed.size = crop.size();
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return {warped.image.copy(crop), placed, crop};
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}
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Corners DistortWarp::carried(const LayerTransform &placement, const LayerTransform &transform, const Corners &corners)
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{
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QTransform toDocument;
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toDocument.translate(transform.center().x(), transform.center().y());
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toDocument.rotateRadians(transform.radians());
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toDocument.scale(transform.size.width(), transform.size.height());
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toDocument.translate(-0.5, -0.5);
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const QTransform toUnit = toDocument.inverted();
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const QTransform map = homography(corners);
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const Corners own = DistortWarp::corners(placement);
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Corners result;
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for (size_t index = 0; index < 4; ++index)
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result[index] = project(map, toUnit.map(own[index]));
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return result;
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}
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DistortWarp::Warped DistortWarp::warpMask(const QImage &image, const LayerTransform &transform, const Corners &corners, double background,
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std::optional<double> limit)
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{
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const Warped warped = warp(image, transform, corners, true, limit);
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if (background <= 0 || warped.image.cacheKey() == image.cacheKey())
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return warped;
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const int width = warped.image.width(), height = warped.image.height();
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QImage surface = BrushRaster::context(width, height, true);
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surface.fill(qRound(background * 255));
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QPainter painter(&surface);
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painter.setRenderHint(QPainter::Antialiasing, true);
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const double sx = width / warped.transform.size.width(), sy = height / warped.transform.size.height();
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QPainterPath shape;
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for (size_t index = 0; index < 4; ++index) {
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const QPointF point((corners[index].x() - warped.transform.origin.x()) * sx, (corners[index].y() - warped.transform.origin.y()) * sy);
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if (index == 0)
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shape.moveTo(point);
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else
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shape.lineTo(point);
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}
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shape.closeSubpath();
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painter.setClipPath(shape);
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BrushRaster::draw(warped.image, QRectF(0, 0, width, height), painter);
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return {surface, warped.transform};
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}
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// Ctrl-drag on a handle: the corners move freely; Apply resamples.
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void EditorSession::beginDistort()
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{
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if (!m_transformEdit || m_transformEdit->corners || !m_transformEdit->draft.isValid())
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return;
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m_transformEdit->corners = DistortWarp::corners(m_transformEdit->draft);
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m_transformEdit->persistent = true;
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notify();
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}
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// A twisted or collapsed shape is ignored.
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void EditorSession::previewCorners(const Corners &corners)
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{
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if (!m_transformEdit || !m_transformEdit->corners || !DistortWarp::isUsable(corners))
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return;
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m_transformEdit->corners = corners;
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notify();
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}
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// A group's layers take the box's perspective each.
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std::optional<DistortTarget> EditorSession::distortTarget(const ImageLayer &layer, const TransformEdit &edit, const Corners &shape) const
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{
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if (!edit.group)
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return edit.layerID == layer.id ? std::optional(DistortTarget{edit.draft, shape}) : std::nullopt;
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const auto original = edit.group->originals.constFind(layer.id);
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if (original == edit.group->originals.constEnd())
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return std::nullopt;
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const LayerTransform transform = original->following(edit.group->box, edit.draft);
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const Corners corners = DistortWarp::carried(transform, edit.draft, shape);
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return DistortWarp::isUsable(corners) ? std::optional(DistortTarget{transform, corners}) : std::nullopt;
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}
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// `image` is the layer with effects round it, mask applied.
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std::optional<DistortWarp::Warped> EditorSession::distortedEffects(const ImageLayer &layer, const QImage &image, double inset) const
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{
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if (!m_transformEdit || m_transformEdit->mask || !m_transformEdit->corners)
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return std::nullopt;
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const std::optional<DistortTarget> target = distortTarget(layer, *m_transformEdit, *m_transformEdit->corners);
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if (!target)
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return std::nullopt;
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return distortedEffects(layer, image, inset, *target);
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}
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std::optional<DistortWarp::Warped> EditorSession::distortedEffects(const ImageLayer &layer, const QImage &image, double inset,
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const DistortTarget &target) const
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{
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// The grown box takes the same perspective as the layer's.
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const LayerTransform grown = LayerEffectsRenderer::placed(target.transform, image, inset);
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const Corners carried = DistortWarp::carried(grown, target.transform, target.corners);
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if (m_distortEffectsCache.contains(layer.id)) {
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const DistortEffectsCache &cache = m_distortEffectsCache.at(layer.id);
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if (cache.corners == carried && cache.image.cacheKey() == image.cacheKey())
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return cache.result;
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}
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std::optional<DistortWarp::Warped> result;
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// Swift's try?: effects that cannot warp are left off.
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try {
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result = DistortWarp::warp(image, grown, carried, false, 2048);
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} catch (const ProjectError &) {
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} catch (const ExportError &) {
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}
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m_distortEffectsCache.insert_or_assign(layer.id, DistortEffectsCache{carried, image, result});
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return result;
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}
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// The layer warped into the pending distortion, at preview size.
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std::optional<DistortPreview> EditorSession::distortPreview(const ImageLayer &layer) const
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{
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if (!m_transformEdit || m_transformEdit->mask || !m_transformEdit->corners || !layer.asset)
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return std::nullopt;
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const std::optional<DistortTarget> target = distortTarget(layer, *m_transformEdit, *m_transformEdit->corners);
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if (!target)
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return std::nullopt;
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const std::optional<QImage> mask = layer.mask ? layer.mask->enabledImage() : std::nullopt;
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const std::optional<ImageIdentity> maskID = mask ? std::optional(layer.mask->asset.identity()) : std::nullopt;
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const auto cached = m_distortPreviewCache.find(layer.id);
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if (cached != m_distortPreviewCache.end() && cached->second.corners == target->corners && cached->second.draft == target->transform
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&& cached->second.image == layer.asset->identity() && cached->second.mask == maskID)
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return cached->second.result;
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std::optional<DistortPreview> result;
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try {
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const DistortWarp::Warped warped = DistortWarp::warp(layer.asset->image(), target->transform, target->corners, false, 2048);
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std::optional<QImage> warpedMask;
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const std::optional<LayerMask> &owned = layer.mask;
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if (owned && !owned->placement && owned->isLinked) {
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// Swift's try?: a mask that cannot warp draws none.
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try {
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if (mask)
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warpedMask = DistortWarp::warp(*mask, target->transform, target->corners, true, 2048).image;
|
||||
} catch (const ProjectError &) {
|
||||
} catch (const ExportError &) {
|
||||
}
|
||||
} else if (owned) {
|
||||
std::optional<QImage> carriedMask;
|
||||
if (owned->isLinked && owned->placement) {
|
||||
// A linked mask placed apart takes the same perspective.
|
||||
const LayerTransform placement = owned->placement->following(layer.transform, target->transform);
|
||||
const Corners carried = DistortWarp::carried(placement, target->transform, target->corners);
|
||||
try {
|
||||
if (DistortWarp::isConvex(carried)) {
|
||||
const DistortWarp::Warped moved = DistortWarp::warpMask(owned->asset.image(), placement, carried, LayerMask::background(owned->asset.thumbnail), 2048);
|
||||
carriedMask = LayerMask(ImportedImage(moved.image, owned->asset.thumbnail, owned->asset.name), owned->isEnabled)
|
||||
.clipImage(moved.transform, warped.transform, warped.image.width(), warped.image.height(), 2048);
|
||||
}
|
||||
} catch (const ProjectError &) {
|
||||
} catch (const ExportError &) {
|
||||
}
|
||||
}
|
||||
// Otherwise the mask stays where it is on the document.
|
||||
warpedMask = carriedMask ? carriedMask : owned->clipImage(owned->placement.value_or(layer.transform), warped.transform, warped.image.width(), warped.image.height(), 2048);
|
||||
}
|
||||
result = DistortPreview{warped.image, warpedMask, warped.transform};
|
||||
} catch (const ProjectError &) {
|
||||
} catch (const ExportError &) {
|
||||
}
|
||||
m_distortPreviewCache.insert_or_assign(layer.id, DistortPreviewCache{target->corners, target->transform, layer.asset->identity(), maskID, result});
|
||||
return result;
|
||||
}
|
||||
|
||||
// Apply: each layer resampled into its shape, one step.
|
||||
void EditorSession::commitDistort(const TransformEdit &edit, const Corners &shape)
|
||||
{
|
||||
m_distortPreviewCache.clear();
|
||||
std::vector<QUuid> ids;
|
||||
if (edit.group) {
|
||||
for (auto original = edit.group->originals.constBegin(); original != edit.group->originals.constEnd(); ++original)
|
||||
ids.push_back(original.key());
|
||||
} else {
|
||||
ids.push_back(edit.layerID);
|
||||
}
|
||||
beginEdit(edit.group ? QStringLiteral("Distort Layers") : QStringLiteral("Distort"));
|
||||
for (const QUuid &id : ids) {
|
||||
const int index = indexOf(m_document->layers, id);
|
||||
if (index < 0)
|
||||
continue;
|
||||
const std::optional<DistortTarget> target = distortTarget(m_document->layers[index], edit, shape);
|
||||
if (!target)
|
||||
continue;
|
||||
// Warped effects stay on until the new pixels' effects land.
|
||||
const std::optional<EffectsPreviewCache::Result> effects = effectsPreviews.rendered(id);
|
||||
const std::optional<DistortWarp::Warped> warpedEffects =
|
||||
effects ? distortedEffects(m_document->layers[index], effects->image, effects->inset, *target) : std::nullopt;
|
||||
try {
|
||||
distort(index, target->transform, target->corners);
|
||||
} catch (const ProjectError &error) {
|
||||
setBrushError(QString::fromUtf8(error.what()));
|
||||
} catch (const ExportError &error) {
|
||||
setBrushError(QString::fromUtf8(error.what()));
|
||||
}
|
||||
// Placed where warped: the commit also crops the layer.
|
||||
if (warpedEffects)
|
||||
effectsPreviews.seed(id, warpedEffects->image, warpedEffects->transform);
|
||||
}
|
||||
endEdit();
|
||||
m_distortEffectsCache.clear();
|
||||
}
|
||||
|
||||
// The layer at `index` resampled onto `corners`.
|
||||
void EditorSession::distort(int index, const LayerTransform &transform, const Corners &corners)
|
||||
{
|
||||
const ImageLayer layer = m_document->layers[index];
|
||||
if (!layer.asset)
|
||||
return;
|
||||
const DistortWarp::Trimmed warped = DistortWarp::warpTrimmed(layer.asset->image(), transform, corners);
|
||||
const ImportedImage asset(warped.image, PixelAdjust::thumbnail(warped.image), layer.name);
|
||||
std::optional<LayerMask> mask = layer.mask;
|
||||
if (layer.mask && !layer.mask->placement && layer.mask->isLinked) {
|
||||
const DistortWarp::Warped warpedMask = DistortWarp::warp(layer.mask->asset.image(), transform, corners, true);
|
||||
// A uniform mask passes through; others crop with the pixels.
|
||||
const bool uniform = warpedMask.image.cacheKey() == layer.mask->asset.image().cacheKey();
|
||||
mask = layer.mask->replacing(uniform ? layer.mask->asset : LayerMask::assetFrom(warpedMask.image.copy(warped.crop)));
|
||||
} else if (layer.mask && layer.mask->isLinked && layer.mask->placement
|
||||
&& DistortWarp::isConvex(DistortWarp::carried(layer.mask->placement->following(layer.transform, transform), transform, corners))) {
|
||||
// A linked mask placed apart takes the same perspective.
|
||||
const LayerTransform placement = layer.mask->placement->following(layer.transform, transform);
|
||||
const DistortWarp::Warped moved = DistortWarp::warpMask(layer.mask->asset.image(), placement, DistortWarp::carried(placement, transform, corners),
|
||||
LayerMask::background(layer.mask->asset.thumbnail));
|
||||
const bool uniform = moved.image.cacheKey() == layer.mask->asset.image().cacheKey();
|
||||
mask = LayerMask(uniform ? layer.mask->asset : LayerMask::assetFrom(moved.image), layer.mask->isEnabled, moved.transform, true);
|
||||
} else if (layer.mask) {
|
||||
// An unlinked mask keeps its place on the document.
|
||||
mask->placement = layer.mask->placement.value_or(layer.transform);
|
||||
}
|
||||
m_document->layers[index].asset = asset;
|
||||
m_document->layers[index].transform = warped.transform;
|
||||
m_document->layers[index].mask = mask;
|
||||
}
|
||||
|
||||
// The selection's outline carried through the distortion.
|
||||
std::optional<QPainterPath> DistortWarp::mapPath(const QPainterPath &path, const QTransform &pixelToDocument, QSizeF pixelSize,
|
||||
const LayerTransform &transform, const Corners &corners)
|
||||
{
|
||||
if (!isConvex(corners) || pixelSize.width() <= 0 || pixelSize.height() <= 0)
|
||||
return std::nullopt;
|
||||
const QTransform toPixels = pixelToDocument.inverted();
|
||||
const QTransform map = homography(corners);
|
||||
const auto carry = [&](QPointF point) {
|
||||
const QPointF pixel = toPixels.map(point);
|
||||
double u = pixel.x() / pixelSize.width(), v = pixel.y() / pixelSize.height();
|
||||
if (transform.flipX)
|
||||
u = 1 - u;
|
||||
if (transform.flipY)
|
||||
v = 1 - v;
|
||||
return project(map, QPointF(u, v));
|
||||
};
|
||||
QPainterPath result;
|
||||
result.setFillRule(path.fillRule());
|
||||
for (int i = 0; i < path.elementCount(); ++i) {
|
||||
const QPainterPath::Element element = path.elementAt(i);
|
||||
if (element.isMoveTo()) {
|
||||
result.moveTo(carry(element));
|
||||
} else if (element.isLineTo()) {
|
||||
result.lineTo(carry(element));
|
||||
} else {
|
||||
// A curve is its first control, then two data elements.
|
||||
result.cubicTo(carry(element), carry(path.elementAt(i + 1)), carry(path.elementAt(i + 2)));
|
||||
i += 2;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
Reference in new issue
Block a user