175 lines
8.6 KiB
C++
175 lines
8.6 KiB
C++
#include "IO/ImageExporter.h"
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#include "Document/DocumentLimits.h"
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#include "Document/LayerEffects+Renderer.h"
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#include "Document/LayerGroups.h"
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#include "Document/LayerMask.h"
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#include "Document/LiveLayerMask.h"
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#include "Logging.h"
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#include "Rendering/LayerRenderer.h"
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#include "Rendering/LiveMaskRenderer.h"
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#include <QBuffer>
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#include <QColorSpace>
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#include <QImageReader>
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#include <QImageWriter>
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#include <QSaveFile>
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#include <algorithm>
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#include <cmath>
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namespace {
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std::string description(ExportError::Kind kind)
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{
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switch (kind) {
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case ExportError::Kind::tooLarge:
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return QStringLiteral("Image export supports canvases up to %1 megapixels and %2 pixels per side.").arg(DocumentLimits::maxSurfaceMegapixels()).arg(DocumentLimits::maxSideText()).toStdString();
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case ExportError::Kind::render:
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return "The canvas could not be rendered. Try a smaller canvas.";
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case ExportError::Kind::encode:
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return "The image could not be encoded.";
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}
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throw std::logic_error("unknown ExportError kind");
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}
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// Quality runs 0 to 100; -1 means the format's own.
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QByteArray encode(QImage image, const char *format, int quality, double resolution)
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{
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const int dotsPerMeter = qRound(resolution / 0.0254);
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image.setDotsPerMeterX(dotsPerMeter);
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image.setDotsPerMeterY(dotsPerMeter);
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image.setColorSpace(QColorSpace::SRgb);
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QByteArray data;
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QBuffer buffer(&data);
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QImageWriter writer(&buffer, format);
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writer.setQuality(quality);
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if (!writer.write(image))
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throw ExportError(ExportError::Kind::encode);
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return data;
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}
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}
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ExportError::ExportError(Kind kind) : std::runtime_error(description(kind)), kind(kind) {}
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ExportRaster ImageExporter::render(const ProjectSnapshot &snapshot)
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try {
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const qint64 width = snapshot.manifest.width, height = snapshot.manifest.height;
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if (width < 1 || width > DocumentLimits::maxSide || height < 1 || height > DocumentLimits::maxSide || width * height > DocumentLimits::maxSurfacePixels)
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throw ExportError(ExportError::Kind::tooLarge);
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QImage image(int(width), int(height), QImage::Format_RGBA8888_Premultiplied);
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if (image.isNull())
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throw ExportError(ExportError::Kind::render);
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image.fill(0);
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const std::vector<ProjectLayerRecord> &layers = snapshot.manifest.layers;
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std::map<QUuid, ProjectLayerRecord> records;
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for (const ProjectLayerRecord &layer : layers) {
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if ((layer.imageFile && !snapshot.images.contains(layer.id)) || (layer.maskFile && !snapshot.masks.contains(layer.id)))
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throw ProjectError(ProjectError::Kind::missingImage);
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records.insert({layer.id, layer});
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}
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LiveMaskGraph::validate(layers);
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const auto parent = [&](QUuid id) { return records.contains(id) ? records.at(id).parentID : std::nullopt; };
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LiveMaskRenderer live([&](QUuid id) { return records.contains(id) ? records.at(id).maskSourceID : std::nullopt; },
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[&](QUuid id, QPainter &target, const QImage &clip) {
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const auto asset = snapshot.images.find(id);
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if (!records.contains(id) || asset == snapshot.images.end())
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return;
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const ProjectLayerRecord &layer = records.at(id);
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const QImage pixels = asset->second.image();
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const std::optional<LayerMask> mask = snapshot.mask(layer);
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const std::optional<QImage> shown =
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mask ? mask->clipImage(mask->placement, layer.transform, pixels.width(), pixels.height()) : std::nullopt;
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const double opacity = layer.effectiveOpacity(records);
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const LayerBlendMode mode = layer.blendMode.value_or(LayerBlendMode::normal);
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// With effects the mask is in their image already.
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if (const auto effects = LayerEffectsRenderer::cached(pixels, shown, layer.effects)) {
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const LayerTransform grown = LayerEffectsRenderer::placed(layer.transform, effects->image, effects->inset);
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LayerRenderer::draw(effects->image, grown, grown.center(), target, {.opacity = opacity, .blendMode = mode, .clip = clip});
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return;
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}
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LayerRenderer::draw(pixels, layer.transform, layer.transform.center(), target,
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{.opacity = opacity, .blendMode = mode, .mask = shown.value_or(QImage()), .clip = clip});
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});
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live.adjustment = [&](QUuid id) { return records.contains(id) ? records.at(id).adjustment : std::nullopt; };
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live.adjustmentOpacity = [&](QUuid id) { return records.at(id).effectiveOpacity(records); };
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live.adjustmentClip = [&](QUuid id, const QPainter &context, QImage &coverage) {
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const ProjectLayerRecord &layer = records.at(id);
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const std::optional<LayerMask> mask = snapshot.mask(layer);
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if (const std::optional<QImage> image = mask ? mask->enabledImage() : std::nullopt)
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FolderMaskClip{*image, layer.transform}.apply(layer.transform.center(), context, coverage);
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};
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std::vector<QUuid> visible;
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for (const ProjectLayerRecord &layer : LayerHierarchy::visibleLayers(layers))
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visible.push_back(layer.id);
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live.prepareStacks(visible, parent, [&](QUuid id) { return records.at(id).blendMode.value_or(LayerBlendMode::normal); });
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{
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QPainter painter(&image);
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FolderMaskClip::draw(visible, parent, [&](QUuid id) -> std::optional<FolderMaskClip::Applier> {
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const std::optional<LayerMask> mask = records.contains(id) ? snapshot.mask(records.at(id)) : std::nullopt;
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const std::optional<QImage> enabled = mask ? mask->enabledImage() : std::nullopt;
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if (!enabled)
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return std::nullopt;
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const FolderMaskClip clip{*enabled, records.at(id).transform};
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return [clip](const QPainter &context, QImage &coverage) { clip.apply(clip.transform.center(), context, coverage); };
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}, painter, [&](QUuid id, const QImage &clip) { live.drawComposite(id, painter, clip); });
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}
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qCInfo(lcIO) << "rendered" << width << "x" << height << "from" << visible.size() << "visible layers";
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return {image, snapshot.manifest.resolution.value_or(72)};
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} catch (const std::bad_alloc &) {
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// Memory that runs out fails the render, as contexts do.
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throw ExportError(ExportError::Kind::render);
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}
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QByteArray ImageExporter::pngData(const ProjectSnapshot &snapshot)
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{
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const ExportRaster raster = render(snapshot);
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return encode(raster.image, "png", -1, raster.resolution);
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}
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JPEGResult ImageExporter::jpeg(const ExportRaster &raster, const JPEGOptions &options, const std::function<bool()> &cancelled)
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try {
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const auto check = [&cancelled] {
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if (cancelled && cancelled())
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throw CancellationError();
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};
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check();
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// JPEG has no alpha: the image lies over the matte.
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QImage flattened(raster.image.size(), QImage::Format_RGB888);
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if (flattened.isNull())
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throw ExportError(ExportError::Kind::render);
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flattened.fill(QColor::fromRgbF(float(options.red), float(options.green), float(options.blue)));
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{
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QPainter painter(&flattened);
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painter.drawImage(QRectF(flattened.rect()), raster.image);
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}
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check();
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QByteArray data = encode(flattened, "jpeg", qRound(std::clamp(options.quality, 0.0, 1.0) * 100), raster.resolution);
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check();
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// The preview shows what the file holds, compression and all.
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QBuffer buffer(&data);
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QImageReader reader(&buffer, "jpeg");
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const QSize size = reader.size();
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// A thin image keeps one pixel across.
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if (std::max(size.width(), size.height()) > 1000)
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reader.setScaledSize(size.scaled(1000, 1000, Qt::KeepAspectRatio).expandedTo(QSize(1, 1)));
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const QImage preview = reader.read();
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if (preview.isNull())
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throw ExportError(ExportError::Kind::encode);
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return {data, preview};
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} catch (const std::bad_alloc &) {
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throw ExportError(ExportError::Kind::render);
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}
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void ImageExporter::exportPNG(const ProjectSnapshot &snapshot, const QString &path)
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{
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write(pngData(snapshot), path);
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}
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void ImageExporter::write(const QByteArray &data, const QString &path)
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{
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QSaveFile file(path);
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if (!file.open(QIODevice::WriteOnly) || file.write(data) != data.size() || !file.commit()) {
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qCWarning(lcIO) << "could not write" << path << ":" << file.errorString();
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throw std::runtime_error(file.errorString().toStdString());
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}
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qCInfo(lcIO) << "wrote" << data.size() << "bytes to" << path;
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}
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