mirror of
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254 lines
8.5 KiB
C++
254 lines
8.5 KiB
C++
/*
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* Copyright (c) 2024, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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* Copyright (c) 2024, Lucien Fiorini <lucienfiorini@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#define AK_DONT_REPLACE_STD
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#include <AK/OwnPtr.h>
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#include <LibGfx/Filter.h>
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#include <LibGfx/ImmutableBitmap.h>
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#include <LibGfx/PainterSkia.h>
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#include <LibGfx/PathSkia.h>
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#include <LibGfx/SkiaUtils.h>
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#include <AK/TypeCasts.h>
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#include <core/SkCanvas.h>
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#include <core/SkPath.h>
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#include <effects/SkBlurMaskFilter.h>
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#include <effects/SkGradientShader.h>
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namespace Gfx {
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struct PainterSkia::Impl {
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RefPtr<Gfx::PaintingSurface> painting_surface;
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Impl(Gfx::PaintingSurface& surface)
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: painting_surface(surface)
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{
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}
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SkCanvas* canvas() const
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{
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return &painting_surface->canvas();
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}
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};
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static void apply_paint_style(SkPaint& paint, Gfx::PaintStyle const& style)
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{
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if (is<Gfx::SolidColorPaintStyle>(style)) {
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auto const& solid_color = static_cast<Gfx::SolidColorPaintStyle const&>(style);
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auto color = solid_color.sample_color(Gfx::IntPoint(0, 0));
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paint.setColor(to_skia_color(color));
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} else if (is<Gfx::CanvasLinearGradientPaintStyle>(style)) {
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auto const& linear_gradient = static_cast<Gfx::CanvasLinearGradientPaintStyle const&>(style);
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auto const& color_stops = linear_gradient.color_stops();
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Vector<SkColor> colors;
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colors.ensure_capacity(color_stops.size());
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Vector<SkScalar> positions;
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positions.ensure_capacity(color_stops.size());
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for (auto const& color_stop : color_stops) {
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colors.append(to_skia_color(color_stop.color));
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positions.append(color_stop.position);
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}
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Array<SkPoint, 2> points;
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points[0] = to_skia_point(linear_gradient.start_point());
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points[1] = to_skia_point(linear_gradient.end_point());
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SkMatrix matrix;
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auto shader = SkGradientShader::MakeLinear(points.data(), colors.data(), positions.data(), color_stops.size(), SkTileMode::kClamp, 0, &matrix);
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paint.setShader(shader);
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} else if (is<Gfx::CanvasRadialGradientPaintStyle>(style)) {
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auto const& radial_gradient = static_cast<Gfx::CanvasRadialGradientPaintStyle const&>(style);
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auto const& color_stops = radial_gradient.color_stops();
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Vector<SkColor> colors;
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colors.ensure_capacity(color_stops.size());
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Vector<SkScalar> positions;
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positions.ensure_capacity(color_stops.size());
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for (auto const& color_stop : color_stops) {
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colors.append(to_skia_color(color_stop.color));
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positions.append(color_stop.position);
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}
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auto start_center = radial_gradient.start_center();
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auto end_center = radial_gradient.end_center();
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auto start_radius = radial_gradient.start_radius();
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auto end_radius = radial_gradient.end_radius();
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auto start_sk_point = to_skia_point(start_center);
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auto end_sk_point = to_skia_point(end_center);
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SkMatrix matrix;
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auto shader = SkGradientShader::MakeTwoPointConical(start_sk_point, start_radius, end_sk_point, end_radius, colors.data(), positions.data(), color_stops.size(), SkTileMode::kClamp, 0, &matrix);
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paint.setShader(shader);
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}
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}
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static void apply_filters(SkPaint& paint, ReadonlySpan<Gfx::Filter> filters)
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{
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for (auto const& filter : filters) {
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paint.setImageFilter(to_skia_image_filter(filter));
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}
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}
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static SkPaint to_skia_paint(Gfx::PaintStyle const& style, ReadonlySpan<Gfx::Filter> filters)
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{
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SkPaint paint;
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apply_paint_style(paint, style);
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apply_filters(paint, filters);
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return paint;
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}
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PainterSkia::PainterSkia(NonnullRefPtr<Gfx::PaintingSurface> painting_surface)
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: m_impl(adopt_own(*new Impl { move(painting_surface) }))
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{
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}
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PainterSkia::~PainterSkia() = default;
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void PainterSkia::clear_rect(Gfx::FloatRect const& rect, Gfx::Color color)
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{
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SkPaint paint;
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paint.setColor(to_skia_color(color));
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paint.setBlendMode(SkBlendMode::kClear);
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impl().canvas()->drawRect(to_skia_rect(rect), paint);
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}
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void PainterSkia::fill_rect(Gfx::FloatRect const& rect, Color color)
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{
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SkPaint paint;
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paint.setColor(to_skia_color(color));
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impl().canvas()->drawRect(to_skia_rect(rect), paint);
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}
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void PainterSkia::draw_bitmap(Gfx::FloatRect const& dst_rect, Gfx::ImmutableBitmap const& src_bitmap, Gfx::IntRect const& src_rect, Gfx::ScalingMode scaling_mode, ReadonlySpan<Gfx::Filter> filters, float global_alpha)
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{
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SkPaint paint;
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apply_filters(paint, filters);
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paint.setAlpha(static_cast<u8>(global_alpha * 255));
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impl().canvas()->drawImageRect(
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src_bitmap.sk_image(),
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to_skia_rect(src_rect),
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to_skia_rect(dst_rect),
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to_skia_sampling_options(scaling_mode),
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&paint,
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SkCanvas::kStrict_SrcRectConstraint);
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}
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void PainterSkia::set_transform(Gfx::AffineTransform const& transform)
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{
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auto matrix = SkMatrix::MakeAll(
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transform.a(), transform.c(), transform.e(),
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transform.b(), transform.d(), transform.f(),
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0, 0, 1);
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impl().canvas()->setMatrix(matrix);
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}
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void PainterSkia::stroke_path(Gfx::Path const& path, Gfx::Color color, float thickness)
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{
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// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
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if (thickness <= 0)
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return;
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(thickness);
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paint.setColor(to_skia_color(color));
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auto sk_path = to_skia_path(path);
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::stroke_path(Gfx::Path const& path, Gfx::Color color, float thickness, float blur_radius)
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{
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// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
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if (thickness <= 0)
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return;
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, blur_radius / 2));
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(thickness);
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paint.setColor(to_skia_color(color));
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auto sk_path = to_skia_path(path);
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::stroke_path(Gfx::Path const& path, Gfx::PaintStyle const& paint_style, ReadonlySpan<Gfx::Filter> filters, float thickness, float global_alpha)
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{
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// Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
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if (thickness <= 0)
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return;
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auto sk_path = to_skia_path(path);
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auto paint = to_skia_paint(paint_style, filters);
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paint.setAntiAlias(true);
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float alpha = paint.getAlphaf();
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paint.setAlphaf(alpha * global_alpha);
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paint.setStyle(SkPaint::Style::kStroke_Style);
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paint.setStrokeWidth(thickness);
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::fill_path(Gfx::Path const& path, Gfx::Color color, Gfx::WindingRule winding_rule)
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{
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setColor(to_skia_color(color));
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auto sk_path = to_skia_path(path);
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sk_path.setFillType(to_skia_path_fill_type(winding_rule));
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::fill_path(Gfx::Path const& path, Gfx::Color color, Gfx::WindingRule winding_rule, float blur_radius)
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{
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, blur_radius / 2));
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paint.setColor(to_skia_color(color));
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auto sk_path = to_skia_path(path);
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sk_path.setFillType(to_skia_path_fill_type(winding_rule));
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::fill_path(Gfx::Path const& path, Gfx::PaintStyle const& paint_style, ReadonlySpan<Gfx::Filter> filters, float global_alpha, Gfx::WindingRule winding_rule)
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{
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auto sk_path = to_skia_path(path);
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sk_path.setFillType(to_skia_path_fill_type(winding_rule));
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auto paint = to_skia_paint(paint_style, filters);
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paint.setAntiAlias(true);
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float alpha = paint.getAlphaf();
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paint.setAlphaf(alpha * global_alpha);
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impl().canvas()->drawPath(sk_path, paint);
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}
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void PainterSkia::save()
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{
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impl().canvas()->save();
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}
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void PainterSkia::restore()
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{
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impl().canvas()->restore();
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}
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void PainterSkia::clip(Gfx::Path const& path, Gfx::WindingRule winding_rule)
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{
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auto sk_path = to_skia_path(path);
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sk_path.setFillType(to_skia_path_fill_type(winding_rule));
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impl().canvas()->clipPath(sk_path, SkClipOp::kIntersect, true);
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}
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}
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