mirror of
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481 lines
21 KiB
C++
481 lines
21 KiB
C++
/*
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* Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Filters/StackBlurFilter.h>
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#include <LibGfx/Painter.h>
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#include <LibWeb/CSS/ComputedValues.h>
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#include <LibWeb/Painting/BorderRadiusCornerClipper.h>
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#include <LibWeb/Painting/DisplayListPlayerCPU.h>
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#include <LibWeb/Painting/DisplayListRecorder.h>
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#include <LibWeb/Painting/FilterPainting.h>
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#include <LibWeb/Painting/ShadowPainting.h>
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namespace Web::Painting {
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DisplayListPlayerCPU::DisplayListPlayerCPU(Gfx::Bitmap& bitmap)
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: m_target_bitmap(bitmap)
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{
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stacking_contexts.append({ .painter = AK::make<Gfx::Painter>(bitmap),
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.opacity = 1.0f,
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.destination = {},
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.scaling_mode = {} });
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}
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DisplayListPlayerCPU::~DisplayListPlayerCPU() = default;
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CommandResult DisplayListPlayerCPU::draw_glyph_run(DrawGlyphRun const& command)
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{
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auto& painter = this->painter();
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auto const& glyphs = command.glyph_run->glyphs();
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auto const& font = command.glyph_run->font();
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auto scaled_font = font.with_size(font.point_size() * static_cast<float>(command.scale));
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for (auto const& glyph_or_emoji : glyphs) {
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auto transformed_glyph = glyph_or_emoji;
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transformed_glyph.visit([&](auto& glyph) {
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glyph.position = glyph.position.scaled(command.scale).translated(command.translation);
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});
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if (glyph_or_emoji.has<Gfx::DrawGlyph>()) {
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auto& glyph = transformed_glyph.get<Gfx::DrawGlyph>();
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painter.draw_glyph(glyph.position, glyph.code_point, *scaled_font, command.color);
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} else {
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auto& emoji = transformed_glyph.get<Gfx::DrawEmoji>();
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painter.draw_emoji(emoji.position.to_type<int>(), *emoji.emoji, *scaled_font);
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}
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}
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return CommandResult::Continue;
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}
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template<typename Callback>
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void apply_clip_paths_to_painter(Gfx::IntRect const& rect, Callback callback, Vector<Gfx::Path> const& clip_paths, Gfx::Painter& target_painter)
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{
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// Setup a painter for a background canvas that we will paint to first.
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auto background_canvas = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, rect.size()).release_value_but_fixme_should_propagate_errors();
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Gfx::Painter painter(*background_canvas);
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// Offset the painter to paint in the correct location.
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painter.translate(-rect.location());
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// Paint the background canvas.
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callback(painter);
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// Apply the clip path to the target painter.
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Gfx::AntiAliasingPainter aa_painter(target_painter);
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for (auto const& clip_path : clip_paths) {
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auto fill_offset = clip_path.bounding_box().location().to_type<int>() - rect.location();
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auto paint_style = Gfx::BitmapPaintStyle::create(*background_canvas, fill_offset).release_value_but_fixme_should_propagate_errors();
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aa_painter.fill_path(clip_path, paint_style);
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}
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}
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CommandResult DisplayListPlayerCPU::fill_rect(FillRect const& command)
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{
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auto paint_op = [&](Gfx::Painter& painter) {
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painter.fill_rect(command.rect, command.color);
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};
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if (command.clip_paths.is_empty()) {
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paint_op(painter());
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} else {
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apply_clip_paths_to_painter(command.rect, paint_op, command.clip_paths, painter());
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::draw_scaled_bitmap(DrawScaledBitmap const& command)
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{
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auto& painter = this->painter();
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painter.draw_scaled_bitmap(command.dst_rect, command.bitmap, command.src_rect, 1, command.scaling_mode);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::draw_scaled_immutable_bitmap(DrawScaledImmutableBitmap const& command)
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{
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auto paint_op = [&](Gfx::Painter& painter) {
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painter.draw_scaled_bitmap(command.dst_rect, command.bitmap->bitmap(), command.src_rect, 1, command.scaling_mode);
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};
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if (command.clip_paths.is_empty()) {
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paint_op(painter());
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} else {
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apply_clip_paths_to_painter(command.dst_rect, paint_op, command.clip_paths, painter());
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::save(Save const&)
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{
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painter().save();
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::restore(Restore const&)
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{
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painter().restore();
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::add_clip_rect(AddClipRect const& command)
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{
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painter().add_clip_rect(command.rect);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::push_stacking_context(PushStackingContext const& command)
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{
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// FIXME: This extracts the affine 2D part of the full transformation matrix.
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// Use the whole matrix when we get better transformation support in LibGfx or use LibGL for drawing the bitmap
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auto affine_transform = Gfx::extract_2d_affine_transform(command.transform.matrix);
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painter().save();
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if (command.is_fixed_position)
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painter().translate(-painter().translation());
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if (command.mask.has_value()) {
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// TODO: Support masks and other stacking context features at the same time.
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// Note: Currently only SVG masking is implemented (which does not use CSS transforms anyway).
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auto bitmap_or_error = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, command.mask->mask_bitmap->size());
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if (bitmap_or_error.is_error())
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return CommandResult::Continue;
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auto bitmap = bitmap_or_error.release_value();
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stacking_contexts.append(StackingContext {
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.painter = AK::make<Gfx::Painter>(bitmap),
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.opacity = 1,
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.destination = command.source_paintable_rect.translated(command.post_transform_translation),
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.scaling_mode = Gfx::ScalingMode::None,
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.mask = command.mask });
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painter().translate(-command.source_paintable_rect.location());
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return CommandResult::Continue;
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}
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if (command.opacity == 1.0f && affine_transform.is_identity_or_translation()) {
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// OPTIMIZATION: This is a simple translation use previous stacking context's painter.
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painter().translate(affine_transform.translation().to_rounded<int>() + command.post_transform_translation);
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stacking_contexts.append(StackingContext {
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.painter = MaybeOwned(painter()),
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.opacity = 1,
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.destination = {},
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.scaling_mode = {} });
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return CommandResult::Continue;
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}
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auto& current_painter = this->painter();
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auto source_rect = command.source_paintable_rect.to_type<float>().translated(-command.transform.origin);
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auto transformed_destination_rect = affine_transform.map(source_rect).translated(command.transform.origin);
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auto destination_rect = transformed_destination_rect.to_rounded<int>();
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// FIXME: We should find a way to scale the paintable, rather than paint into a separate bitmap,
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// then scale it. This snippet now copies the background at the destination, then scales it down/up
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// to the size of the source (which could add some artefacts, though just scaling the bitmap already does that).
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// We need to copy the background at the destination because a bunch of our rendering effects now rely on
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// being able to sample the painter (see border radii, shadows, filters, etc).
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Gfx::FloatPoint destination_clipped_fixup {};
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auto try_get_scaled_destination_bitmap = [&]() -> ErrorOr<NonnullRefPtr<Gfx::Bitmap>> {
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Gfx::IntRect actual_destination_rect;
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auto bitmap = TRY(current_painter.get_region_bitmap(destination_rect, Gfx::BitmapFormat::BGRA8888, actual_destination_rect));
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// get_region_bitmap() may clip to a smaller region if the requested rect goes outside the painter, so we need to account for that.
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destination_clipped_fixup = Gfx::FloatPoint { destination_rect.location() - actual_destination_rect.location() };
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destination_rect = actual_destination_rect;
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if (source_rect.size() != transformed_destination_rect.size()) {
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auto sx = static_cast<float>(source_rect.width()) / transformed_destination_rect.width();
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auto sy = static_cast<float>(source_rect.height()) / transformed_destination_rect.height();
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bitmap = TRY(bitmap->scaled(sx, sy));
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destination_clipped_fixup.scale_by(sx, sy);
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}
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return bitmap;
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};
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auto bitmap_or_error = try_get_scaled_destination_bitmap();
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if (bitmap_or_error.is_error()) {
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// NOTE: If the creation of the bitmap fails, we need to skip all painting commands that belong to this stacking context.
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// We don't interrupt the execution of painting commands because get_region_bitmap() returns an error if the requested
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// region is outside of the viewport (mmap fails to allocate a zero-size region), which means we can safely proceed
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// with execution of commands outside of this stacking context.
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// FIXME: Change the get_region_bitmap() API to return ErrorOr<Optional<Bitmap>> and exit the execution of commands here
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// if we run out of memory.
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painter().restore();
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return CommandResult::SkipStackingContext;
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}
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auto bitmap = bitmap_or_error.release_value();
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stacking_contexts.append(StackingContext {
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.painter = AK::make<Gfx::Painter>(bitmap),
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.opacity = command.opacity,
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.destination = destination_rect.translated(command.post_transform_translation),
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.scaling_mode = CSS::to_gfx_scaling_mode(command.image_rendering, destination_rect, destination_rect) });
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painter().translate(-command.source_paintable_rect.location() + destination_clipped_fixup.to_type<int>());
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::pop_stacking_context(PopStackingContext const&)
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{
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ScopeGuard restore_painter = [&] {
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painter().restore();
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};
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auto stacking_context = stacking_contexts.take_last();
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// Stacking contexts that don't own their painter are simple translations, and don't need to blit anything back.
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if (stacking_context.painter.is_owned()) {
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auto& bitmap = stacking_context.painter->target();
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if (stacking_context.mask.has_value())
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bitmap.apply_mask(*stacking_context.mask->mask_bitmap, stacking_context.mask->mask_kind);
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auto destination_rect = stacking_context.destination;
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if (destination_rect.size() == bitmap.size()) {
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painter().blit(destination_rect.location(), bitmap, bitmap.rect(), stacking_context.opacity);
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} else {
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painter().draw_scaled_bitmap(destination_rect, bitmap, bitmap.rect(), stacking_context.opacity, stacking_context.scaling_mode);
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}
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::paint_linear_gradient(PaintLinearGradient const& command)
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{
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auto const& linear_gradient_data = command.linear_gradient_data;
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auto paint_op = [&](Gfx::Painter& painter) {
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painter.fill_rect_with_linear_gradient(
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command.gradient_rect, linear_gradient_data.color_stops.list,
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linear_gradient_data.gradient_angle, linear_gradient_data.color_stops.repeat_length);
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};
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if (command.clip_paths.is_empty()) {
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paint_op(painter());
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} else {
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apply_clip_paths_to_painter(command.gradient_rect, paint_op, command.clip_paths, painter());
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::paint_outer_box_shadow(PaintOuterBoxShadow const& command)
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{
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auto& painter = this->painter();
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Web::Painting::paint_outer_box_shadow(painter, command.box_shadow_params);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::paint_inner_box_shadow(PaintInnerBoxShadow const& command)
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{
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auto& painter = this->painter();
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Web::Painting::paint_inner_box_shadow(painter, command.box_shadow_params);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::paint_text_shadow(PaintTextShadow const& command)
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{
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// FIXME: Figure out the maximum bitmap size for all shadows and then allocate it once and reuse it?
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auto maybe_shadow_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, command.shadow_bounding_rect.size());
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if (maybe_shadow_bitmap.is_error()) {
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dbgln("Unable to allocate temporary bitmap {} for text-shadow rendering: {}", command.shadow_bounding_rect.size(), maybe_shadow_bitmap.error());
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return CommandResult::Continue;
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}
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auto shadow_bitmap = maybe_shadow_bitmap.release_value();
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Gfx::Painter shadow_painter { *shadow_bitmap };
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// FIXME: "Spread" the shadow somehow.
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Gfx::IntPoint const baseline_start(command.text_rect.x(), command.text_rect.y());
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shadow_painter.translate(baseline_start);
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auto const& glyphs = command.glyph_run->glyphs();
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auto const& font = command.glyph_run->font();
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auto scaled_font = font.with_size(font.point_size() * static_cast<float>(command.glyph_run_scale));
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for (auto const& glyph_or_emoji : glyphs) {
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auto transformed_glyph = glyph_or_emoji;
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transformed_glyph.visit([&](auto& glyph) {
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glyph.position = glyph.position.scaled(command.glyph_run_scale);
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});
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if (glyph_or_emoji.has<Gfx::DrawGlyph>()) {
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auto& glyph = transformed_glyph.get<Gfx::DrawGlyph>();
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shadow_painter.draw_glyph(glyph.position, glyph.code_point, *scaled_font, command.color);
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} else {
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auto& emoji = transformed_glyph.get<Gfx::DrawEmoji>();
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shadow_painter.draw_emoji(emoji.position.to_type<int>(), *emoji.emoji, *scaled_font);
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}
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}
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// Blur
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Gfx::StackBlurFilter filter(*shadow_bitmap);
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filter.process_rgba(command.blur_radius, command.color);
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painter().blit(command.draw_location, *shadow_bitmap, command.shadow_bounding_rect);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::fill_rect_with_rounded_corners(FillRectWithRoundedCorners const& command)
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{
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auto paint_op = [&](Gfx::Painter& painter) {
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Gfx::AntiAliasingPainter aa_painter(painter);
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aa_painter.fill_rect_with_rounded_corners(
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command.rect,
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command.color,
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command.corner_radii.top_left,
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command.corner_radii.top_right,
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command.corner_radii.bottom_right,
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command.corner_radii.bottom_left);
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};
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if (command.clip_paths.is_empty()) {
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paint_op(painter());
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} else {
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apply_clip_paths_to_painter(command.rect, paint_op, command.clip_paths, painter());
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::fill_path_using_color(FillPathUsingColor const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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aa_painter.translate(command.aa_translation);
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aa_painter.fill_path(command.path, command.color, command.winding_rule);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::fill_path_using_paint_style(FillPathUsingPaintStyle const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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auto gfx_paint_style = command.paint_style->create_gfx_paint_style();
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aa_painter.translate(command.aa_translation);
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aa_painter.fill_path(command.path, gfx_paint_style, command.opacity, command.winding_rule);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::stroke_path_using_color(StrokePathUsingColor const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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aa_painter.translate(command.aa_translation);
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aa_painter.stroke_path(command.path, command.color, command.thickness);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::stroke_path_using_paint_style(StrokePathUsingPaintStyle const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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auto gfx_paint_style = command.paint_style->create_gfx_paint_style();
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aa_painter.translate(command.aa_translation);
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aa_painter.stroke_path(command.path, gfx_paint_style, command.thickness, command.opacity);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::draw_ellipse(DrawEllipse const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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aa_painter.draw_ellipse(command.rect, command.color, command.thickness);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::fill_ellipse(FillEllipse const& command)
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{
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Gfx::AntiAliasingPainter aa_painter(painter());
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aa_painter.fill_ellipse(command.rect, command.color);
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::draw_line(DrawLine const& command)
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{
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if (command.style == Gfx::LineStyle::Dotted) {
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Gfx::AntiAliasingPainter aa_painter(painter());
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aa_painter.draw_line(command.from, command.to, command.color, command.thickness, command.style, command.alternate_color);
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} else {
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painter().draw_line(command.from, command.to, command.color, command.thickness, command.style, command.alternate_color);
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}
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return CommandResult::Continue;
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}
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CommandResult DisplayListPlayerCPU::apply_backdrop_filter(ApplyBackdropFilter const& command)
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{
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auto& painter = this->painter();
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// This performs the backdrop filter operation: https://drafts.fxtf.org/filter-effects-2/#backdrop-filter-operation
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// Note: The region bitmap can be smaller than the backdrop_region if it's at the edge of canvas.
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// Note: This is in DevicePixels, but we use an IntRect because `get_region_bitmap()` below writes to it.
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// FIXME: Go through the steps to find the "Backdrop Root Image"
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// https://drafts.fxtf.org/filter-effects-2/#BackdropRoot
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// 1. Copy the Backdrop Root Image into a temporary buffer, such as a raster image. Call this buffer T’.
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Gfx::IntRect actual_region {};
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auto maybe_backdrop_bitmap = painter.get_region_bitmap(command.backdrop_region, Gfx::BitmapFormat::BGRA8888, actual_region);
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if (actual_region.is_empty())
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return CommandResult::Continue;
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if (maybe_backdrop_bitmap.is_error()) {
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dbgln("Failed get region bitmap for backdrop-filter");
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return CommandResult::Continue;
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}
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auto backdrop_bitmap = maybe_backdrop_bitmap.release_value();
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// 2. Apply the backdrop-filter’s filter operations to the entire contents of T'.
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apply_filter_list(*backdrop_bitmap, command.backdrop_filter.filters);
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// FIXME: 3. If element B has any transforms (between B and the Backdrop Root), apply the inverse of those transforms to the contents of T’.
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// 4. Apply a clip to the contents of T’, using the border box of element B, including border-radius if specified. Note that the children of B are not considered for the sizing or location of this clip.
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// FIXME: 5. Draw all of element B, including its background, border, and any children elements, into T’.
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// FXIME: 6. If element B has any transforms, effects, or clips, apply those to T’.
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// 7. Composite the contents of T’ into element B’s parent, using source-over compositing.
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painter.blit(actual_region.location(), *backdrop_bitmap, backdrop_bitmap->rect());
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::draw_rect(DrawRect const& command)
|
||
{
|
||
painter().draw_rect(command.rect, command.color, command.rough);
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::paint_radial_gradient(PaintRadialGradient const& command)
|
||
{
|
||
auto paint_op = [&](Gfx::Painter& painter) {
|
||
painter.fill_rect_with_radial_gradient(command.rect, command.radial_gradient_data.color_stops.list, command.center, command.size, command.radial_gradient_data.color_stops.repeat_length);
|
||
};
|
||
if (command.clip_paths.is_empty()) {
|
||
paint_op(painter());
|
||
} else {
|
||
apply_clip_paths_to_painter(command.rect, paint_op, command.clip_paths, painter());
|
||
}
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::paint_conic_gradient(PaintConicGradient const& command)
|
||
{
|
||
auto paint_op = [&](Gfx::Painter& painter) {
|
||
painter.fill_rect_with_conic_gradient(command.rect, command.conic_gradient_data.color_stops.list, command.position, command.conic_gradient_data.start_angle, command.conic_gradient_data.color_stops.repeat_length);
|
||
};
|
||
if (command.clip_paths.is_empty()) {
|
||
paint_op(painter());
|
||
} else {
|
||
apply_clip_paths_to_painter(command.rect, paint_op, command.clip_paths, painter());
|
||
}
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::draw_triangle_wave(DrawTriangleWave const& command)
|
||
{
|
||
painter().draw_triangle_wave(command.p1, command.p2, command.color, command.amplitude, command.thickness);
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
void DisplayListPlayerCPU::prepare_to_execute(size_t corner_clip_max_depth)
|
||
{
|
||
m_corner_clippers_stack.ensure_capacity(corner_clip_max_depth);
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::sample_under_corners(SampleUnderCorners const& command)
|
||
{
|
||
auto clipper = BorderRadiusCornerClipper::create(command.corner_radii, command.border_rect.to_type<DevicePixels>(), command.corner_clip).release_value();
|
||
clipper->sample_under_corners(painter());
|
||
m_corner_clippers_stack.append(clipper);
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
CommandResult DisplayListPlayerCPU::blit_corner_clipping(BlitCornerClipping const&)
|
||
{
|
||
auto clipper = m_corner_clippers_stack.take_last();
|
||
clipper->blit_corner_clipping(painter());
|
||
return CommandResult::Continue;
|
||
}
|
||
|
||
bool DisplayListPlayerCPU::would_be_fully_clipped_by_painter(Gfx::IntRect rect) const
|
||
{
|
||
return !painter().clip_rect().intersects(rect.translated(painter().translation()));
|
||
}
|
||
|
||
}
|