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LibAccelGfx+LibWeb: Support non-translation transforms in GPU painter

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This change introduces GPU painter support for rotate(), skew(),
scale(), and other transformations that could be applied to stacking
context.
This commit is contained in:
Aliaksandr Kalenik 2023-11-30 20:54:20 +01:00 • committed by Andreas Kling
parent 45d81dceed
commit c28f6828c9
4 changed files with 52 additions and 25 deletions
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40
Userland/Libraries/LibAccelGfx/Painter.cpp
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@ -586,24 +586,44 @@ void Painter::flush(Gfx::Bitmap& bitmap)
GL::read_pixels({ 0, 0, bitmap.width(), bitmap.height() }, bitmap);
}
void Painter::blit_canvas(Gfx::IntRect const& dst_rect, Canvas const& canvas, float opacity)
void Painter::blit_canvas(Gfx::IntRect const& dst_rect, Canvas const& canvas, float opacity, Optional<Gfx::AffineTransform> affine_transform)
{
blit_canvas(dst_rect.to_type<float>(), canvas, opacity);
blit_canvas(dst_rect.to_type<float>(), canvas, opacity, move(affine_transform));
}
void Painter::blit_canvas(Gfx::FloatRect const& dst_rect, Canvas const& canvas, float opacity)
void Painter::blit_canvas(Gfx::FloatRect const& dst_rect, Canvas const& canvas, float opacity, Optional<Gfx::AffineTransform> affine_transform)
{
auto texture = GL::Texture(canvas.framebuffer().texture);
blit_scaled_texture(dst_rect, texture, { { 0, 0 }, canvas.size() }, Painter::ScalingMode::NearestNeighbor, opacity);
blit_scaled_texture(dst_rect, texture, { { 0, 0 }, canvas.size() }, Painter::ScalingMode::NearestNeighbor, opacity, move(affine_transform));
}
void Painter::blit_scaled_texture(Gfx::FloatRect const& dst_rect, GL::Texture const& texture, Gfx::FloatRect const& src_rect, ScalingMode scaling_mode, float opacity)
void Painter::blit_scaled_texture(Gfx::FloatRect const& dst_rect, GL::Texture const& texture, Gfx::FloatRect const& src_rect, ScalingMode scaling_mode, float opacity, Optional<Gfx::AffineTransform> affine_transform)
{
bind_target_canvas();
m_blit_program.use();
auto dst_rect_in_clip_space = to_clip_space(transform().map(dst_rect));
auto dst_rect_rotated = dst_rect;
Array<Gfx::FloatPoint, 4> dst_rect_vertices = {
dst_rect_rotated.top_left(),
dst_rect_rotated.bottom_left(),
dst_rect_rotated.bottom_right(),
dst_rect_rotated.top_right(),
};
if (affine_transform.has_value()) {
for (auto& point : dst_rect_vertices)
point = affine_transform->map(point);
}
auto const viewport_width = static_cast<float>(m_target_canvas->size().width());
auto const viewport_height = static_cast<float>(m_target_canvas->size().height());
for (auto& point : dst_rect_vertices) {
point = transform().map(point);
point.set_x(2.0f * point.x() / viewport_width - 1.0f);
point.set_y(-1.0f + 2.0f * point.y() / viewport_height);
}
auto src_rect_in_texture_space = to_texture_space(src_rect, *texture.size);
Vector<GLfloat> vertices;
@ -616,10 +636,10 @@ void Painter::blit_scaled_texture(Gfx::FloatRect const& dst_rect, GL::Texture co
vertices.append(s.y());
};
add_vertex(dst_rect_in_clip_space.top_left(), src_rect_in_texture_space.top_left());
add_vertex(dst_rect_in_clip_space.bottom_left(), src_rect_in_texture_space.bottom_left());
add_vertex(dst_rect_in_clip_space.bottom_right(), src_rect_in_texture_space.bottom_right());
add_vertex(dst_rect_in_clip_space.top_right(), src_rect_in_texture_space.top_right());
add_vertex(dst_rect_vertices[0], src_rect_in_texture_space.top_left());
add_vertex(dst_rect_vertices[1], src_rect_in_texture_space.bottom_left());
add_vertex(dst_rect_vertices[2], src_rect_in_texture_space.bottom_right());
add_vertex(dst_rect_vertices[3], src_rect_in_texture_space.top_right());
auto vbo = GL::create_buffer();
GL::upload_to_buffer(vbo, vertices);