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LibGfx: Allow requesting vector graphic frames from ImageDecoder

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Only supported for plugins that set is_vector() to true. This returns
the frames as Gfx::VectorGraphics, which allows painting/rasterizing
them with arbitrary transforms and scales.
This commit is contained in:
MacDue 2023-07-07 22:23:04 +01:00 • committed by Andreas Kling
parent 8784568a36
commit 753cf04be8
3 changed files with 39 additions and 30 deletions
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40
Userland/Libraries/LibGfx/ImageFormats/TinyVGLoader.cpp
View file

@ -327,7 +327,7 @@ private:
ReadonlySpan<Color> m_color_table;
};
ErrorOr<TinyVGDecodedImageData> TinyVGDecodedImageData::decode(Stream& stream)
ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(Stream& stream)
{
auto header = TRY(decode_tinyvg_header(stream));
if (header.version != 1)
@ -437,48 +437,35 @@ ErrorOr<TinyVGDecodedImageData> TinyVGDecodedImageData::decode(Stream& stream)
}
}
return TinyVGDecodedImageData { { header.width, header.height }, move(draw_commands) };
return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) TinyVGDecodedImageData({ header.width, header.height }, move(draw_commands))));
}
ErrorOr<RefPtr<Gfx::Bitmap>> TinyVGDecodedImageData::bitmap(IntSize size) const
void TinyVGDecodedImageData::draw_transformed(Painter& painter, AffineTransform transform) const
{
auto scale_x = float(size.width()) / m_size.width();
auto scale_y = float(size.height()) / m_size.height();
auto transform = Gfx::AffineTransform {}.scale(scale_x, scale_y);
auto bitmap = TRY(Bitmap::create(Gfx::BitmapFormat::BGRA8888, size));
Painter base_painter { *bitmap };
AntiAliasingPainter painter { base_painter };
// FIXME: Correctly handle non-uniform scales.
auto scale = max(transform.x_scale(), transform.y_scale());
AntiAliasingPainter aa_painter { painter };
for (auto const& command : draw_commands()) {
auto draw_path = command.path.copy_transformed(transform);
if (command.fill.has_value()) {
auto fill_path = draw_path;
fill_path.close_all_subpaths();
command.fill->visit(
[&](Color color) { painter.fill_path(fill_path, color, Painter::WindingRule::EvenOdd); },
[&](Color color) { aa_painter.fill_path(fill_path, color, Painter::WindingRule::EvenOdd); },
[&](NonnullRefPtr<SVGGradientPaintStyle> style) {
const_cast<SVGGradientPaintStyle&>(*style).set_gradient_transform(transform);
painter.fill_path(fill_path, style, 1.0f, Painter::WindingRule::EvenOdd);
aa_painter.fill_path(fill_path, style, 1.0f, Painter::WindingRule::EvenOdd);
});
}
if (command.stroke.has_value()) {
// FIXME: A more correct way to non-uniformly scale strokes would be:
// 1. Scale the path uniformly by the largest of scale_x/y
// 2. Convert that to a fill with .stroke_to_fill()
// 3.
// If scale_x > scale_y
// Scale by: (1, scale_y/scale_x)
// else
// Scale by: (scale_x/scale_y, 1)
auto stroke_scale = max(scale_x, scale_y);
command.stroke->visit(
[&](Color color) { painter.stroke_path(draw_path, color, command.stroke_width * stroke_scale); },
[&](Color color) { aa_painter.stroke_path(draw_path, color, command.stroke_width * scale); },
[&](NonnullRefPtr<SVGGradientPaintStyle> style) {
const_cast<SVGGradientPaintStyle&>(*style).set_gradient_transform(transform);
painter.stroke_path(draw_path, style, command.stroke_width * stroke_scale);
aa_painter.stroke_path(draw_path, style, command.stroke_width * scale);
});
}
}
return bitmap;
}
TinyVGImageDecoderPlugin::TinyVGImageDecoderPlugin(ReadonlyBytes bytes)
@ -507,7 +494,7 @@ IntSize TinyVGImageDecoderPlugin::size()
ErrorOr<void> TinyVGImageDecoderPlugin::initialize()
{
FixedMemoryStream stream { { m_context.data.data(), m_context.data.size() } };
m_context.decoded_image = make<TinyVGDecodedImageData>(TRY(TinyVGDecodedImageData::decode(stream)));
m_context.decoded_image = TRY(TinyVGDecodedImageData::decode(stream));
return {};
}
@ -519,4 +506,9 @@ ErrorOr<ImageFrameDescriptor> TinyVGImageDecoderPlugin::frame(size_t, Optional<I
return ImageFrameDescriptor { m_context.bitmap };
}
ErrorOr<VectorImageFrameDescriptor> TinyVGImageDecoderPlugin::vector_frame(size_t)
{
return VectorImageFrameDescriptor { m_context.decoded_image, 0 };
}
}