From 39c500ec7c363145cca61577c5a04d69bdc68447 Mon Sep 17 00:00:00 2001
From: Pavel Shliak <shlyakpavel@gmail.com>
Date: Sat, 23 Nov 2024 03:08:07 +0400
Subject: [PATCH] LibGfx: Use Skia for TinyVG rendering

---
 .../LibGfx/ImageFormats/TinyVGLoader.cpp      | 32 +++++++++----------
 Libraries/LibGfx/ImageFormats/TinyVGLoader.h  |  7 ++--
 Libraries/LibGfx/VectorGraphic.cpp            | 10 +++---
 Libraries/LibGfx/VectorGraphic.h              |  5 +--
 UI/Qt/TVGIconEngine.cpp                       | 28 +++++++++++++---
 5 files changed, 51 insertions(+), 31 deletions(-)

diff --git a/Libraries/LibGfx/ImageFormats/TinyVGLoader.cpp b/Libraries/LibGfx/ImageFormats/TinyVGLoader.cpp
index f76bdbcd65d5..3b7a8933b217 100644
--- a/Libraries/LibGfx/ImageFormats/TinyVGLoader.cpp
+++ b/Libraries/LibGfx/ImageFormats/TinyVGLoader.cpp
@@ -10,10 +10,10 @@
 #include <AK/LEB128.h>
 #include <AK/MemoryStream.h>
 #include <AK/Variant.h>
-#include <LibGfx/AntiAliasingPainter.h>
-#include <LibGfx/DeprecatedPainter.h>
 #include <LibGfx/ImageFormats/TinyVGLoader.h>
 #include <LibGfx/Line.h>
+#include <LibGfx/Painter.h>
+#include <LibGfx/Path.h>
 #include <LibGfx/Point.h>
 
 namespace Gfx {
@@ -254,9 +254,9 @@ class TinyVGReader {
         return FloatLine { TRY(read_point()), TRY(read_point()) };
     }
 
-    ErrorOr<DeprecatedPath> read_path(u32 segment_count)
+    ErrorOr<Path> read_path(u32 segment_count)
     {
-        DeprecatedPath path;
+        Path path;
         auto segment_lengths = TRY(FixedArray<u32>::create(segment_count));
         for (auto& command_count : segment_lengths) {
             command_count = TRY(read_var_uint()) + 1;
@@ -366,8 +366,8 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
     auto color_table = TRY(decode_color_table(stream, header.color_encoding, header.color_count));
     TinyVGReader reader { stream, header, color_table.span() };
 
-    auto rectangle_to_path = [](FloatRect const& rect) -> DeprecatedPath {
-        DeprecatedPath path;
+    auto rectangle_to_path = [](FloatRect const& rect) -> Path {
+        Path path;
         path.move_to({ rect.x(), rect.y() });
         path.line_to({ rect.x() + rect.width(), rect.y() });
         path.line_to({ rect.x() + rect.width(), rect.y() + rect.height() });
@@ -389,7 +389,7 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
             break;
         case Command::FillPolygon: {
             auto header = TRY(reader.read_fill_command_header(style_type));
-            DeprecatedPath polygon;
+            Path polygon;
             polygon.move_to(TRY(reader.read_point()));
             for (u32 i = 0; i < header.count - 1; i++)
                 polygon.line_to(TRY(reader.read_point()));
@@ -412,7 +412,7 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
         }
         case Command::DrawLines: {
             auto header = TRY(reader.read_draw_command_header(style_type));
-            DeprecatedPath path;
+            Path path;
             for (u32 i = 0; i < header.count; i++) {
                 auto line = TRY(reader.read_line());
                 path.move_to(line.a());
@@ -424,7 +424,7 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
         case Command::DrawLineStrip:
         case Command::DrawLineLoop: {
             auto header = TRY(reader.read_draw_command_header(style_type));
-            DeprecatedPath path;
+            Path path;
             path.move_to(TRY(reader.read_point()));
             for (u32 i = 0; i < header.count - 1; i++)
                 path.line_to(TRY(reader.read_point()));
@@ -441,7 +441,7 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
         }
         case Command::OutlineFillPolygon: {
             auto header = TRY(reader.read_outline_fill_command_header(style_type));
-            DeprecatedPath polygon;
+            Path polygon;
             polygon.move_to(TRY(reader.read_point()));
             for (u32 i = 0; i < header.count - 1; i++)
                 polygon.line_to(TRY(reader.read_point()));
@@ -471,29 +471,29 @@ ErrorOr<NonnullRefPtr<TinyVGDecodedImageData>> TinyVGDecodedImageData::decode(St
     return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) TinyVGDecodedImageData({ header.width, header.height }, move(draw_commands))));
 }
 
-void TinyVGDecodedImageData::draw_transformed(DeprecatedPainter& painter, AffineTransform transform) const
+void TinyVGDecodedImageData::draw_transformed(Painter& painter, AffineTransform transform) const
 {
     // 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) { aa_painter.fill_path(fill_path, color, WindingRule::EvenOdd); },
+                [&](Color color) { painter.fill_path(fill_path, color, WindingRule::EvenOdd); },
                 [&](NonnullRefPtr<SVGGradientPaintStyle> style) {
                     const_cast<SVGGradientPaintStyle&>(*style).set_gradient_transform(transform);
-                    aa_painter.fill_path(fill_path, style, 1.0f, WindingRule::EvenOdd);
+                    painter.fill_path(fill_path, style, 1.0f, WindingRule::EvenOdd);
                 });
         }
+
         if (command.stroke.has_value()) {
             command.stroke->visit(
-                [&](Color color) { aa_painter.stroke_path(draw_path, color, command.stroke_width * scale); },
+                [&](Color color) { painter.stroke_path(draw_path, color, command.stroke_width * scale); },
                 [&](NonnullRefPtr<SVGGradientPaintStyle> style) {
                     const_cast<SVGGradientPaintStyle&>(*style).set_gradient_transform(transform);
-                    aa_painter.stroke_path(draw_path, style, command.stroke_width * scale);
+                    painter.stroke_path(draw_path, style, command.stroke_width * scale, 1.0f);
                 });
         }
     }
diff --git a/Libraries/LibGfx/ImageFormats/TinyVGLoader.h b/Libraries/LibGfx/ImageFormats/TinyVGLoader.h
index 044e7ee9b2d4..dff2af12f750 100644
--- a/Libraries/LibGfx/ImageFormats/TinyVGLoader.h
+++ b/Libraries/LibGfx/ImageFormats/TinyVGLoader.h
@@ -10,10 +10,11 @@
 #include <AK/OwnPtr.h>
 #include <AK/Vector.h>
 #include <LibGfx/Color.h>
-#include <LibGfx/DeprecatedPath.h>
 #include <LibGfx/Forward.h>
 #include <LibGfx/ImageFormats/ImageDecoder.h>
 #include <LibGfx/PaintStyle.h>
+#include <LibGfx/Painter.h>
+#include <LibGfx/Path.h>
 #include <LibGfx/VectorGraphic.h>
 
 namespace Gfx {
@@ -41,7 +42,7 @@ class TinyVGDecodedImageData final : public VectorGraphic {
     using Style = Variant<Color, NonnullRefPtr<SVGGradientPaintStyle>>;
 
     struct DrawCommand {
-        DeprecatedPath path;
+        Path path;
         Optional<Style> fill {};
         Optional<Style> stroke {};
         float stroke_width { 0.0f };
@@ -52,7 +53,7 @@ class TinyVGDecodedImageData final : public VectorGraphic {
         return m_size;
     }
 
-    virtual void draw_transformed(DeprecatedPainter&, AffineTransform) const override;
+    virtual void draw_transformed(Painter&, AffineTransform) const override;
 
     ReadonlySpan<DrawCommand> draw_commands() const
     {
diff --git a/Libraries/LibGfx/VectorGraphic.cpp b/Libraries/LibGfx/VectorGraphic.cpp
index 1a7ec2994317..255c55f44ad1 100644
--- a/Libraries/LibGfx/VectorGraphic.cpp
+++ b/Libraries/LibGfx/VectorGraphic.cpp
@@ -4,12 +4,12 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibGfx/DeprecatedPainter.h>
+#include <LibGfx/PainterSkia.h>
 #include <LibGfx/VectorGraphic.h>
 
 namespace Gfx {
 
-void VectorGraphic::draw_into(DeprecatedPainter& painter, IntRect const& dest, AffineTransform transform) const
+void VectorGraphic::draw_into(Painter& painter, IntRect const& dest, AffineTransform transform) const
 {
     // Apply the transform then center within destination rectangle (this ignores any translation from the transform):
     // This allows you to easily rotate or flip the image before painting.
@@ -21,14 +21,14 @@ void VectorGraphic::draw_into(DeprecatedPainter& painter, IntRect const& dest, A
                               .multiply(AffineTransform {}.scale(scale, scale))
                               .multiply(AffineTransform {}.translate(-transformed_rect.location()))
                               .multiply(transform);
-    return draw_transformed(painter, view_transform);
+    draw_transformed(painter, view_transform);
 }
 
 ErrorOr<NonnullRefPtr<Gfx::Bitmap>> VectorGraphic::bitmap(IntSize size, AffineTransform transform) const
 {
     auto bitmap = TRY(Bitmap::create(Gfx::BitmapFormat::BGRA8888, size));
-    DeprecatedPainter painter { *bitmap };
-    draw_into(painter, IntRect { {}, size }, transform);
+    auto painter = PainterSkia::create(bitmap);
+    draw_into(*painter, IntRect { {}, size }, transform);
     return bitmap;
 }
 
diff --git a/Libraries/LibGfx/VectorGraphic.h b/Libraries/LibGfx/VectorGraphic.h
index c437e3b9ba01..6f048b4dcec2 100644
--- a/Libraries/LibGfx/VectorGraphic.h
+++ b/Libraries/LibGfx/VectorGraphic.h
@@ -9,6 +9,7 @@
 #include <AK/RefCounted.h>
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/Forward.h>
+#include <LibGfx/Painter.h>
 #include <LibGfx/Size.h>
 
 namespace Gfx {
@@ -16,13 +17,13 @@ namespace Gfx {
 class VectorGraphic : public RefCounted<VectorGraphic> {
 public:
     virtual IntSize intrinsic_size() const = 0;
-    virtual void draw_transformed(DeprecatedPainter&, AffineTransform) const = 0;
+    virtual void draw_transformed(Painter&, AffineTransform) const = 0;
 
     IntSize size() const { return intrinsic_size(); }
     IntRect rect() const { return { {}, size() }; }
 
     ErrorOr<NonnullRefPtr<Gfx::Bitmap>> bitmap(IntSize size, AffineTransform = {}) const;
-    void draw_into(DeprecatedPainter&, IntRect const& dest, AffineTransform = {}) const;
+    void draw_into(Painter& painter, IntRect const& dest, AffineTransform = {}) const;
 
     virtual ~VectorGraphic() = default;
 };
diff --git a/UI/Qt/TVGIconEngine.cpp b/UI/Qt/TVGIconEngine.cpp
index 50b153425969..862291bcbc8b 100644
--- a/UI/Qt/TVGIconEngine.cpp
+++ b/UI/Qt/TVGIconEngine.cpp
@@ -6,7 +6,8 @@
 
 #include <AK/MemoryStream.h>
 #include <AK/String.h>
-#include <LibGfx/DeprecatedPainter.h>
+#include <LibGfx/PainterSkia.h>
+#include <LibGfx/Rect.h>
 #include <UI/Qt/StringUtils.h>
 #include <UI/Qt/TVGIconEngine.h>
 
@@ -34,15 +35,32 @@ QPixmap TVGIconEngine::pixmap(QSize const& size, QIcon::Mode mode, QIcon::State
     if (QPixmapCache::find(key, &pixmap))
         return pixmap;
     auto bitmap = MUST(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { size.width(), size.height() }));
-    Gfx::DeprecatedPainter painter { *bitmap };
-    m_image_data->draw_into(painter, bitmap->rect());
+
+    auto painter = Gfx::PainterSkia::create(bitmap);
+    painter->clear_rect(bitmap->rect().to_type<float>(), Gfx::Color::Transparent);
+
+    m_image_data->draw_into(*painter, bitmap->rect());
+
     for (auto const& filter : m_filters) {
         if (filter->mode() == mode) {
-            painter.blit_filtered({}, *bitmap, bitmap->rect(), filter->function(), false);
+            for (int y = 0; y < bitmap->height(); ++y) {
+                for (int x = 0; x < bitmap->width(); ++x) {
+                    auto original_color = bitmap->get_pixel(x, y);
+                    auto filtered_color = filter->function()(original_color);
+                    bitmap->set_pixel(x, y, filtered_color);
+                }
+            }
             break;
         }
     }
-    QImage qimage { bitmap->scanline_u8(0), bitmap->width(), bitmap->height(), QImage::Format::Format_ARGB32 };
+
+    QImage qimage(
+        bitmap->scanline_u8(0),
+        bitmap->width(),
+        bitmap->height(),
+        static_cast<qsizetype>(bitmap->pitch()),
+        QImage::Format::Format_ARGB32);
+
     pixmap = QPixmap::fromImage(qimage);
     if (!pixmap.isNull())
         QPixmapCache::insert(key, pixmap);