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LibAccelGfx+LibWeb: Add support for stacking context opacity

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For each stacking context with an opacity less than 1, we create a
separate framebuffer. We then blit the texture attached to this
framebuffer with the specified opacity.

To avoid the performance overhead of reading pixels from the texture
into Gfx::Bitmap, a new method that allows for direct blitting from
the texture is introduced, named blit_scaled_texture().
This commit is contained in:
Aliaksandr Kalenik 2023-11-23 15:28:51 +01:00 • committed by Andreas Kling
parent cb90daadc7
commit 5f7ac559a7
8 changed files with 133 additions and 74 deletions
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116
Userland/Libraries/LibAccelGfx/Painter.cpp
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@ -142,6 +142,16 @@ OwnPtr<Painter> Painter::create()
return make<Painter>(context);
}
OwnPtr<Painter> Painter::create_with_glyphs_texture_from_painter(Painter const& painter)
{
auto& context = Context::the();
auto glyphs_texture_painter = make<Painter>(context);
glyphs_texture_painter->m_glyphs_texture = painter.m_glyphs_texture;
glyphs_texture_painter->m_glyphs_texture_size = painter.m_glyphs_texture_size;
glyphs_texture_painter->m_glyphs_texture_map = painter.m_glyphs_texture_map;
return glyphs_texture_painter;
}
Painter::Painter(Context& context)
: m_context(context)
, m_rectangle_program(Program::create(Program::Name::RectangleProgram, vertex_shader_source, solid_color_fragment_shader_source))
@ -333,54 +343,11 @@ static GL::ScalingMode to_gl_scaling_mode(Painter::ScalingMode scaling_mode)
void Painter::draw_scaled_bitmap(Gfx::FloatRect const& dst_rect, Gfx::Bitmap const& bitmap, Gfx::FloatRect const& src_rect, ScalingMode scaling_mode)
{
bind_target_canvas();
m_blit_program.use();
// FIXME: We should reuse textures across repaints if possible.
auto texture = GL::create_texture();
GL::upload_texture_data(texture, bitmap);
auto scaling_mode_gl = to_gl_scaling_mode(scaling_mode);
GL::set_texture_scale_mode(scaling_mode_gl);
auto dst_rect_in_clip_space = to_clip_space(transform().map(dst_rect));
auto src_rect_in_texture_space = to_texture_space(src_rect, bitmap.size());
Vector<GLfloat> vertices;
vertices.ensure_capacity(16);
auto add_vertex = [&](auto const& p, auto const& s) {
vertices.append(p.x());
vertices.append(p.y());
vertices.append(s.x());
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());
auto vbo = GL::create_buffer();
GL::upload_to_buffer(vbo, vertices);
auto vao = GL::create_vertex_array();
GL::bind_vertex_array(vao);
GL::bind_buffer(vbo);
auto vertex_position_attribute = m_blit_program.get_attribute_location("aVertexPosition");
GL::set_vertex_attribute(vertex_position_attribute, 0, 4);
auto color_uniform = m_blit_program.get_uniform_location("uColor");
GL::set_uniform(color_uniform, 1, 1, 1, 1);
GL::enable_blending();
GL::draw_arrays(GL::DrawPrimitive::TriangleFan, 4);
blit_scaled_texture(dst_rect, texture, src_rect, scaling_mode);
GL::delete_texture(texture);
GL::delete_buffer(vbo);
GL::delete_vertex_array(vao);
}
void Painter::prepare_glyph_texture(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs)
@ -662,4 +629,65 @@ 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)
{
blit_canvas(dst_rect.to_type<float>(), canvas, opacity);
}
void Painter::blit_canvas(Gfx::FloatRect const& dst_rect, Canvas const& canvas, float opacity)
{
auto texture = GL::Texture(canvas.framebuffer().texture);
blit_scaled_texture(dst_rect, texture, { { 0, 0 }, canvas.size() }, Painter::ScalingMode::NearestNeighbor, 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)
{
bind_target_canvas();
m_blit_program.use();
auto dst_rect_in_clip_space = to_clip_space(transform().map(dst_rect));
auto src_rect_in_texture_space = to_texture_space(src_rect, *texture.size);
Vector<GLfloat> vertices;
vertices.ensure_capacity(16);
auto add_vertex = [&](auto const& p, auto const& s) {
vertices.append(p.x());
vertices.append(p.y());
vertices.append(s.x());
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());
auto vbo = GL::create_buffer();
GL::upload_to_buffer(vbo, vertices);
auto vao = GL::create_vertex_array();
GL::bind_vertex_array(vao);
GL::bind_buffer(vbo);
auto vertex_position_attribute = m_blit_program.get_attribute_location("aVertexPosition");
GL::set_vertex_attribute(vertex_position_attribute, 0, 4);
auto color_uniform = m_blit_program.get_uniform_location("uColor");
GL::set_uniform(color_uniform, 1, 1, 1, opacity);
GL::bind_texture(texture);
auto scaling_mode_gl = to_gl_scaling_mode(scaling_mode);
GL::set_texture_scale_mode(scaling_mode_gl);
GL::enable_blending();
GL::draw_arrays(GL::DrawPrimitive::TriangleFan, 4);
GL::delete_buffer(vbo);
GL::delete_vertex_array(vao);
}
}