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db9fa7ff07
Errors can (and do) occur when trying to render text, and so far we've silently ignored them, making us think that all is well when it isn't. Letting show_text return errors will allow us to inform the user about these errors instead of having to hiding them.
275 lines
9.5 KiB
C++
275 lines
9.5 KiB
C++
/*
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* Copyright (c) 2021-2022, 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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#pragma once
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#include <AK/Format.h>
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#include <LibGfx/AffineTransform.h>
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#include <LibGfx/AntiAliasingPainter.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Font/FontDatabase.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/Path.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/Size.h>
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#include <LibPDF/ColorSpace.h>
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#include <LibPDF/Document.h>
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#include <LibPDF/Fonts/PDFFont.h>
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#include <LibPDF/Object.h>
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namespace PDF {
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enum class LineCapStyle : u8 {
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ButtCap = 0,
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RoundCap = 1,
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SquareCap = 2,
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};
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enum class LineJoinStyle : u8 {
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Miter = 0,
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Round = 1,
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Bevel = 2,
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};
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struct LineDashPattern {
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Vector<int> pattern;
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int phase;
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};
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enum class TextRenderingMode : u8 {
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Fill = 0,
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Stroke = 1,
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FillThenStroke = 2,
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Invisible = 3,
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FillAndClip = 4,
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StrokeAndClip = 5,
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FillStrokeAndClip = 6,
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Clip = 7,
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};
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struct TextState {
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float character_spacing { 0.0f };
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float word_spacing { 0.0f };
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float horizontal_scaling { 1.0f };
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float leading { 0.0f };
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float font_size { 12.0f };
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RefPtr<PDFFont> font;
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TextRenderingMode rendering_mode { TextRenderingMode::Fill };
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float rise { 0.0f };
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bool knockout { true };
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};
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struct ClippingPaths {
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Gfx::Path current;
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Gfx::Path next;
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};
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struct GraphicsState {
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Gfx::AffineTransform ctm;
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ClippingPaths clipping_paths;
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RefPtr<ColorSpace> stroke_color_space { DeviceGrayColorSpace::the() };
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RefPtr<ColorSpace> paint_color_space { DeviceGrayColorSpace::the() };
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Gfx::Color stroke_color { Gfx::Color::NamedColor::Black };
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Gfx::Color paint_color { Gfx::Color::NamedColor::Black };
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float line_width { 1.0f };
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LineCapStyle line_cap_style { LineCapStyle::ButtCap };
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LineJoinStyle line_join_style { LineJoinStyle::Miter };
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float miter_limit { 10.0f };
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LineDashPattern line_dash_pattern { {}, 0 };
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TextState text_state {};
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};
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struct RenderingPreferences {
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bool show_clipping_paths { false };
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bool show_images { true };
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unsigned hash() const
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{
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return static_cast<unsigned>(show_clipping_paths) | static_cast<unsigned>(show_images) << 1;
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}
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};
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class Renderer {
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public:
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static PDFErrorsOr<void> render(Document&, Page const&, RefPtr<Gfx::Bitmap>, RenderingPreferences preferences);
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private:
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Renderer(RefPtr<Document>, Page const&, RefPtr<Gfx::Bitmap>, RenderingPreferences);
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PDFErrorsOr<void> render();
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PDFErrorOr<void> handle_operator(Operator const&, Optional<NonnullRefPtr<DictObject>> = {});
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#define V(name, snake_name, symbol) \
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PDFErrorOr<void> handle_##snake_name(Vector<Value> const& args, Optional<NonnullRefPtr<DictObject>> = {});
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ENUMERATE_OPERATORS(V)
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#undef V
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PDFErrorOr<void> handle_text_next_line_show_string(Vector<Value> const& args, Optional<NonnullRefPtr<DictObject>> = {});
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PDFErrorOr<void> handle_text_next_line_show_string_set_spacing(Vector<Value> const& args, Optional<NonnullRefPtr<DictObject>> = {});
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void begin_path_paint();
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void end_path_paint();
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PDFErrorOr<void> set_graphics_state_from_dict(NonnullRefPtr<DictObject>);
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PDFErrorOr<void> show_text(DeprecatedString const&);
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PDFErrorOr<NonnullRefPtr<Gfx::Bitmap>> load_image(NonnullRefPtr<StreamObject>);
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PDFErrorOr<void> show_image(NonnullRefPtr<StreamObject>);
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void show_empty_image(int width, int height);
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PDFErrorOr<NonnullRefPtr<ColorSpace>> get_color_space_from_resources(Value const&, NonnullRefPtr<DictObject>);
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PDFErrorOr<NonnullRefPtr<ColorSpace>> get_color_space_from_document(NonnullRefPtr<Object>);
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ALWAYS_INLINE GraphicsState const& state() const { return m_graphics_state_stack.last(); }
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ALWAYS_INLINE GraphicsState& state() { return m_graphics_state_stack.last(); }
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ALWAYS_INLINE TextState const& text_state() const { return state().text_state; }
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ALWAYS_INLINE TextState& text_state() { return state().text_state; }
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template<typename T>
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ALWAYS_INLINE Gfx::Point<T> map(T x, T y) const;
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template<typename T>
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ALWAYS_INLINE Gfx::Size<T> map(Gfx::Size<T>) const;
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template<typename T>
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ALWAYS_INLINE Gfx::Rect<T> map(Gfx::Rect<T>) const;
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Gfx::AffineTransform const& calculate_text_rendering_matrix();
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Gfx::AffineTransform calculate_image_space_transformation(int width, int height);
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RefPtr<Document> m_document;
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RefPtr<Gfx::Bitmap> m_bitmap;
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Page const& m_page;
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Gfx::Painter m_painter;
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Gfx::AntiAliasingPainter m_anti_aliasing_painter;
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RenderingPreferences m_rendering_preferences;
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Gfx::Path m_current_path;
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Vector<GraphicsState> m_graphics_state_stack;
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Gfx::AffineTransform m_text_matrix;
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Gfx::AffineTransform m_text_line_matrix;
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bool m_text_rendering_matrix_is_dirty { true };
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Gfx::AffineTransform m_text_rendering_matrix;
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};
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}
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namespace AK {
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template<>
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struct Formatter<PDF::LineCapStyle> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, PDF::LineCapStyle const& style)
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{
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switch (style) {
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case PDF::LineCapStyle::ButtCap:
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return builder.put_string("LineCapStyle::ButtCap"sv);
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case PDF::LineCapStyle::RoundCap:
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return builder.put_string("LineCapStyle::RoundCap"sv);
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case PDF::LineCapStyle::SquareCap:
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return builder.put_string("LineCapStyle::SquareCap"sv);
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}
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}
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};
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template<>
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struct Formatter<PDF::LineJoinStyle> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, PDF::LineJoinStyle const& style)
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{
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switch (style) {
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case PDF::LineJoinStyle::Miter:
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return builder.put_string("LineJoinStyle::Miter"sv);
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case PDF::LineJoinStyle::Round:
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return builder.put_string("LineJoinStyle::Round"sv);
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case PDF::LineJoinStyle::Bevel:
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return builder.put_string("LineJoinStyle::Bevel"sv);
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}
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}
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};
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template<>
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struct Formatter<PDF::LineDashPattern> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& format_builder, PDF::LineDashPattern const& pattern)
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{
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StringBuilder builder;
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builder.append('[');
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bool first = true;
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for (auto& i : pattern.pattern) {
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if (!first)
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builder.append(", "sv);
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first = false;
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builder.appendff("{}", i);
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}
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builder.appendff("] {}", pattern.phase);
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return format_builder.put_string(builder.to_deprecated_string());
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}
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};
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template<>
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struct Formatter<PDF::TextRenderingMode> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, PDF::TextRenderingMode const& style)
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{
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switch (style) {
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case PDF::TextRenderingMode::Fill:
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return builder.put_string("TextRenderingMode::Fill"sv);
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case PDF::TextRenderingMode::Stroke:
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return builder.put_string("TextRenderingMode::Stroke"sv);
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case PDF::TextRenderingMode::FillThenStroke:
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return builder.put_string("TextRenderingMode::FillThenStroke"sv);
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case PDF::TextRenderingMode::Invisible:
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return builder.put_string("TextRenderingMode::Invisible"sv);
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case PDF::TextRenderingMode::FillAndClip:
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return builder.put_string("TextRenderingMode::FillAndClip"sv);
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case PDF::TextRenderingMode::StrokeAndClip:
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return builder.put_string("TextRenderingMode::StrokeAndClip"sv);
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case PDF::TextRenderingMode::FillStrokeAndClip:
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return builder.put_string("TextRenderingMode::FillStrokeAndClip"sv);
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case PDF::TextRenderingMode::Clip:
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return builder.put_string("TextRenderingMode::Clip"sv);
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}
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}
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};
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template<>
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struct Formatter<PDF::TextState> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& format_builder, PDF::TextState const& state)
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{
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StringBuilder builder;
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builder.append("TextState {\n"sv);
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builder.appendff(" character_spacing={}\n", state.character_spacing);
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builder.appendff(" word_spacing={}\n", state.word_spacing);
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builder.appendff(" horizontal_scaling={}\n", state.horizontal_scaling);
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builder.appendff(" leading={}\n", state.leading);
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builder.appendff(" font_size={}\n", state.font_size);
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builder.appendff(" rendering_mode={}\n", state.rendering_mode);
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builder.appendff(" rise={}\n", state.rise);
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builder.appendff(" knockout={}\n", state.knockout);
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builder.append(" }"sv);
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return format_builder.put_string(builder.to_deprecated_string());
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}
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};
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template<>
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struct Formatter<PDF::GraphicsState> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& format_builder, PDF::GraphicsState const& state)
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{
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StringBuilder builder;
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builder.append("GraphicsState {\n"sv);
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builder.appendff(" ctm={}\n", state.ctm);
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builder.appendff(" stroke_color={}\n", state.stroke_color);
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builder.appendff(" paint_color={}\n", state.paint_color);
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builder.appendff(" line_width={}\n", state.line_width);
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builder.appendff(" line_cap_style={}\n", state.line_cap_style);
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builder.appendff(" line_join_style={}\n", state.line_join_style);
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builder.appendff(" miter_limit={}\n", state.miter_limit);
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builder.appendff(" line_dash_pattern={}\n", state.line_dash_pattern);
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builder.appendff(" text_state={}\n", state.text_state);
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builder.append('}');
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return format_builder.put_string(builder.to_deprecated_string());
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}
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};
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}
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