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https://github.com/RGBCube/serenity
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LibPDF: Add a bitmap renderer
This commit adds the Renderer class, which is responsible for rendering a page into a Gfx::Bitmap. There are many improvements to make here, but this is a great start!
This commit is contained in:
Matthew Olsson
Andreas Kling
parent
d6a9b41bac
commit
4479c1bff0
4 changed files with 655 additions and 4 deletions
399
Userland/Libraries/LibPDF/Renderer.cpp
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399
Userland/Libraries/LibPDF/Renderer.cpp
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/*
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* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Utf8View.h>
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#include <LibPDF/Renderer.h>
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#include <ctype.h>
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#include <math.h>
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namespace PDF {
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void Renderer::render(Document& document, const Page& page, RefPtr<Gfx::Bitmap> bitmap)
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{
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Renderer(document, page, bitmap).render();
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}
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Renderer::Renderer(RefPtr<Document> document, const Page& page, RefPtr<Gfx::Bitmap> bitmap)
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: m_document(document)
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, m_bitmap(bitmap)
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, m_page(page)
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, m_painter(*bitmap)
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{
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auto media_box = m_page.media_box;
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m_userspace_matrix.translate(media_box.lower_left_x, media_box.lower_left_y);
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float width = media_box.upper_right_x - media_box.lower_left_x;
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float height = media_box.upper_right_y - media_box.lower_left_y;
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float scale_x = static_cast<float>(bitmap->width()) / width;
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float scale_y = static_cast<float>(bitmap->height()) / height;
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m_userspace_matrix.scale(scale_x, scale_y);
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m_graphics_state_stack.append(GraphicsState { m_userspace_matrix });
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m_bitmap->fill(Gfx::Color::NamedColor::White);
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}
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void Renderer::render()
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{
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// Use our own vector, as the /Content can be an array with multiple
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// streams which gets concatenated
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// FIXME: Text operators are supposed to only have effects on the current
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// stream object. Do the text operators treat this concatenated stream
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// as one stream or multiple?
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ByteBuffer byte_buffer;
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if (m_page.contents->is_array()) {
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auto contents = object_cast<ArrayObject>(m_page.contents);
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for (auto& ref : *contents) {
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auto bytes = m_document->resolve_to<StreamObject>(ref)->bytes();
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byte_buffer.append(bytes.data(), bytes.size());
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}
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} else {
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VERIFY(m_page.contents->is_stream());
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auto bytes = object_cast<StreamObject>(m_page.contents)->bytes();
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byte_buffer.append(bytes.data(), bytes.size());
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}
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auto commands = Parser::parse_graphics_commands(byte_buffer);
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for (auto& command : commands)
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handle_command(command);
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}
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void Renderer::handle_command(const Command& command)
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{
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switch (command.command_type()) {
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#define V(name, snake_name, symbol) \
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case CommandType::name: \
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return handle_##snake_name(command.arguments());
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ENUMERATE_COMMANDS(V)
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#undef V
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case CommandType::TextNextLineShowString:
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return handle_text_next_line_show_string(command.arguments());
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}
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}
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void Renderer::handle_save_state(const Vector<Value>&)
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{
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m_graphics_state_stack.append(state());
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}
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void Renderer::handle_restore_state(const Vector<Value>&)
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{
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m_graphics_state_stack.take_last();
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}
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void Renderer::handle_concatenate_matrix(const Vector<Value>& args)
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{
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Gfx::AffineTransform new_transform(
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args[0].to_float(),
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args[1].to_float(),
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args[2].to_float(),
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args[3].to_float(),
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args[4].to_float(),
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args[5].to_float());
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state().ctm.multiply(new_transform);
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m_text_rendering_matrix_is_dirty = true;
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}
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void Renderer::handle_set_line_width(const Vector<Value>& args)
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{
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state().line_width = args[0].to_float();
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}
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void Renderer::handle_set_line_cap(const Vector<Value>& args)
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{
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state().line_cap_style = static_cast<LineCapStyle>(args[0].as_int());
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}
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void Renderer::handle_set_line_join(const Vector<Value>& args)
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{
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state().line_join_style = static_cast<LineJoinStyle>(args[0].as_int());
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}
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void Renderer::handle_set_miter_limit(const Vector<Value>& args)
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{
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state().miter_limit = args[0].to_float();
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}
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void Renderer::handle_set_dash_pattern(const Vector<Value>& args)
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{
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auto dash_array = m_document->resolve_to<ArrayObject>(args[0]);
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Vector<int> pattern;
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for (auto& element : *dash_array)
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pattern.append(element.as_int());
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state().line_dash_pattern = LineDashPattern { pattern, args[1].as_int() };
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}
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void Renderer::handle_path_begin(const Vector<Value>&)
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{
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m_path = Gfx::Path();
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}
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void Renderer::handle_path_end(const Vector<Value>&)
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{
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}
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void Renderer::handle_path_line(const Vector<Value>& args)
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{
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m_path.line_to(map(args[0].to_float(), args[1].to_float()));
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}
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void Renderer::handle_path_close(const Vector<Value>&)
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{
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m_path.close();
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}
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void Renderer::handle_path_append_rect(const Vector<Value>& args)
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{
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auto pos = map(args[0].to_float(), args[1].to_float());
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auto size = map(Gfx::FloatSize { args[2].to_float(), args[3].to_float() });
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m_path.move_to(pos);
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m_path.line_to({ pos.x() + size.width(), pos.y() });
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m_path.line_to({ pos.x() + size.width(), pos.y() + size.height() });
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m_path.line_to({ pos.x(), pos.y() + size.height() });
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m_path.close();
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}
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void Renderer::handle_path_stroke(const Vector<Value>&)
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{
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m_painter.stroke_path(m_path, state().stroke_color, state().line_width);
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}
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void Renderer::handle_path_close_and_stroke(const Vector<Value>& args)
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{
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m_path.close();
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handle_path_stroke(args);
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}
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void Renderer::handle_path_fill_nonzero(const Vector<Value>&)
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{
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m_painter.fill_path(m_path, state().paint_color, Gfx::Painter::WindingRule::Nonzero);
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}
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void Renderer::handle_path_fill_nonzero_deprecated(const Vector<Value>& args)
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{
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handle_path_fill_nonzero(args);
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}
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void Renderer::handle_path_fill_evenodd(const Vector<Value>&)
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{
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m_painter.fill_path(m_path, state().paint_color, Gfx::Painter::WindingRule::EvenOdd);
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}
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void Renderer::handle_path_fill_stroke_nonzero(const Vector<Value>& args)
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{
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m_painter.stroke_path(m_path, state().stroke_color, state().line_width);
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handle_path_fill_nonzero(args);
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}
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void Renderer::handle_path_fill_stroke_evenodd(const Vector<Value>& args)
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{
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m_painter.stroke_path(m_path, state().stroke_color, state().line_width);
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handle_path_fill_evenodd(args);
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}
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void Renderer::handle_path_close_fill_stroke_nonzero(const Vector<Value>& args)
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{
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m_path.close();
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handle_path_fill_stroke_nonzero(args);
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}
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void Renderer::handle_path_close_fill_stroke_evenodd(const Vector<Value>& args)
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{
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m_path.close();
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handle_path_fill_stroke_evenodd(args);
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}
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void Renderer::handle_text_set_char_space(const Vector<Value>& args)
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{
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text_state().character_spacing = args[0].to_float();
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}
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void Renderer::handle_text_set_word_space(const Vector<Value>& args)
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{
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text_state().word_spacing = args[0].to_float();
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}
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void Renderer::handle_text_set_horizontal_scale(const Vector<Value>& args)
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{
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m_text_rendering_matrix_is_dirty = true;
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text_state().horizontal_scaling = args[0].to_float() / 100.0f;
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}
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void Renderer::handle_text_set_leading(const Vector<Value>& args)
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{
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text_state().leading = args[0].to_float();
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}
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void Renderer::handle_text_set_font(const Vector<Value>& args)
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{
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auto target_font_name = m_document->resolve_to<NameObject>(args[0])->name();
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auto fonts_dictionary = m_page.resources->get_dict(m_document, "Font");
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auto font_dictionary = fonts_dictionary->get_dict(m_document, target_font_name);
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// FIXME: We do not yet have the standard 14 fonts, as some of them are not open fonts,
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// so we just use LiberationSerif for everything
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auto font_name = font_dictionary->get_name(m_document, "BaseFont")->name().to_lowercase();
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auto font_view = font_name.view();
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bool is_bold = font_view.contains("bold");
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bool is_italic = font_view.contains("italic");
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String font_variant;
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if (is_bold && is_italic) {
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font_variant = "BoldItalic";
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} else if (is_bold) {
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font_variant = "Bold";
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} else if (is_italic) {
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font_variant = "Italic";
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} else {
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font_variant = "Regular";
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}
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auto specified_font_size = args[1].to_float();
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// FIXME: This scaling should occur when drawing the glyph rather than selecting the font.
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// This should be removed when the painter supports arbitrary bitmap scaling.
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specified_font_size *= state().ctm.x_scale();
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text_state().font = Gfx::FontDatabase::the().get("Liberation Serif", font_variant, static_cast<int>(specified_font_size));
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VERIFY(text_state().font);
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m_text_rendering_matrix_is_dirty = true;
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}
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void Renderer::handle_text_set_rendering_mode(const Vector<Value>& args)
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{
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text_state().rendering_mode = static_cast<TextRenderingMode>(args[0].as_int());
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}
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void Renderer::handle_text_set_rise(const Vector<Value>& args)
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{
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m_text_rendering_matrix_is_dirty = true;
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text_state().rise = args[0].to_float();
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}
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void Renderer::handle_text_begin(const Vector<Value>&)
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{
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m_text_matrix = Gfx::AffineTransform();
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m_text_line_matrix = Gfx::AffineTransform();
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}
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void Renderer::handle_text_end(const Vector<Value>&)
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{
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// FIXME: Do we need to do anything here?
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}
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void Renderer::handle_text_next_line_offset(const Vector<Value>& args)
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{
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Gfx::AffineTransform transform(1.0f, 0.0f, 0.0f, 1.0f, args[0].to_float(), args[1].to_float());
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transform.multiply(m_text_line_matrix);
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m_text_matrix = transform;
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m_text_line_matrix = transform;
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m_text_rendering_matrix_is_dirty = true;
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}
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void Renderer::handle_text_next_line_and_set_leading(const Vector<Value>& args)
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{
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text_state().leading = -args[1].to_float();
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handle_text_next_line_offset(args);
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}
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void Renderer::handle_text_set_matrix_and_line_matrix(const Vector<Value>& args)
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{
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Gfx::AffineTransform new_transform(
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args[0].to_float(),
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args[1].to_float(),
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args[2].to_float(),
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args[3].to_float(),
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args[4].to_float(),
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args[5].to_float());
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m_text_line_matrix = new_transform;
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m_text_matrix = new_transform;
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m_text_rendering_matrix_is_dirty = true;
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}
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void Renderer::handle_text_next_line(const Vector<Value>&)
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{
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handle_text_next_line_offset({ 0.0f, -text_state().leading });
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}
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void Renderer::handle_text_show_string(const Vector<Value>& args)
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{
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auto text = m_document->resolve_to<StringObject>(args[0])->string();
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show_text(text);
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}
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void Renderer::handle_text_next_line_show_string(const Vector<Value>& args)
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{
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handle_text_next_line(args);
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handle_text_show_string(args);
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}
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template<typename T>
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Gfx::Point<T> Renderer::map(T x, T y) const
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{
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auto mapped = state().ctm.map(Gfx::Point<T> { x, y });
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return { mapped.x(), static_cast<T>(m_bitmap->height()) - mapped.y() };
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}
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template<typename T>
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Gfx::Size<T> Renderer::map(Gfx::Size<T> size) const
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{
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return state().ctm.map(size);
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}
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void Renderer::show_text(const String& string, int shift)
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{
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auto utf = Utf8View(string);
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auto& font = text_state().font;
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for (auto codepoint : utf) {
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// FIXME: Don't calculate this matrix for every character
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auto& text_rendering_matrix = calculate_text_rendering_matrix();
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auto text_position = text_rendering_matrix.map(Gfx::FloatPoint { 0.0f, 0.0f });
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text_position.set_y(static_cast<float>(m_bitmap->height()) - text_position.y());
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// FIXME: For some reason, the space character in LiberationSerif is drawn as an exclamation point
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if (codepoint != 0x20)
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m_painter.draw_glyph(text_position.to_type<int>(), codepoint, *text_state().font, state().paint_color);
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auto glyph_width = static_cast<float>(font->glyph_width(codepoint));
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auto tx = (glyph_width - static_cast<float>(shift) / 1000.0f);
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tx += text_state().character_spacing;
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if (codepoint == ' ')
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tx += text_state().word_spacing;
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tx *= text_state().horizontal_scaling;
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m_text_rendering_matrix_is_dirty = true;
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m_text_matrix = Gfx::AffineTransform(1, 0, 0, 1, tx, 0).multiply(m_text_matrix);
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}
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}
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const Gfx::AffineTransform& Renderer::calculate_text_rendering_matrix()
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{
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if (m_text_rendering_matrix_is_dirty) {
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m_text_rendering_matrix = Gfx::AffineTransform(
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text_state().horizontal_scaling,
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0.0f,
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0.0f,
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1.0f,
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0.0f,
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text_state().rise);
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m_text_rendering_matrix.multiply(m_text_matrix);
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m_text_rendering_matrix.multiply(state().ctm);
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m_text_rendering_matrix_is_dirty = false;
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}
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return m_text_rendering_matrix;
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}
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}
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