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LibPDF: Add basic color space support to the renderer

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This commit only supports the three most basic color spaces:
DeviceGray, DeviceRGB, and DeviceCMYK
This commit is contained in:
Matthew Olsson 2021-05-23 12:53:38 -07:00 • committed by Ali Mohammad Pur
parent f4941f5940
commit 534a2e95d2
3 changed files with 177 additions and 24 deletions
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145
Userland/Libraries/LibPDF/Renderer.cpp
View file

@ -21,6 +21,58 @@
namespace PDF {
Optional<ColorSpace::Type> ColorSpace::color_space_from_string(const StringView& str)
{
#define ENUM(name) \
if (str == #name) \
return ColorSpace::Type::name;
ENUMERATE_COLOR_SPACES(ENUM)
#undef ENUM
return {};
}
Color ColorSpace::default_color_for_color_space(ColorSpace::Type color_space)
{
switch (color_space) {
case Type::DeviceGray:
case Type::DeviceRGB:
return Color::NamedColor::Black;
case Type::DeviceCMYK:
return Color::from_cmyk(1.0f, 1.0f, 1.0f, 0.0f);
default:
TODO();
}
}
Color ColorSpace::color_from_parameters(ColorSpace::Type color_space, const Vector<Value>& args)
{
switch (color_space) {
case Type::DeviceGray: {
VERIFY(args.size() == 1);
auto gray = static_cast<u8>(args[0].to_float() * 255.0f);
return Color(gray, gray, gray);
}
case Type::DeviceRGB: {
VERIFY(args.size() == 3);
auto r = static_cast<u8>(args[0].to_float() * 255.0f);
auto g = static_cast<u8>(args[1].to_float() * 255.0f);
auto b = static_cast<u8>(args[2].to_float() * 255.0f);
return Color(r, g, b);
}
case Type::DeviceCMYK: {
VERIFY(args.size() == 4);
auto c = args[0].to_float();
auto m = args[1].to_float();
auto y = args[2].to_float();
auto k = args[3].to_float();
return Color::from_cmyk(c, m, y, k);
}
default:
TODO();
}
}
void Renderer::render(Document& document, const Page& page, RefPtr<Gfx::Bitmap> bitmap)
{
Renderer(document, page, bitmap).render();
@ -381,18 +433,69 @@ RENDERER_TODO(text_next_line_show_string_set_spacing);
RENDERER_TODO(text_show_string_array);
RENDERER_TODO(type3_font_set_glyph_width);
RENDERER_TODO(type3_font_set_glyph_width_and_bbox);
RENDERER_TODO(color_set_stroking_space);
RENDERER_TODO(color_set_painting_space);
RENDERER_TODO(color_set_stroking);
RENDERER_TODO(color_set_stroking_extended);
RENDERER_TODO(color_set_painting);
RENDERER_TODO(color_set_painting_extended);
RENDERER_TODO(color_set_stroking_space_to_gray);
RENDERER_TODO(color_set_painting_space_to_gray);
RENDERER_TODO(color_set_stroking_space_to_rgb);
RENDERER_TODO(color_set_painting_space_to_rgb);
RENDERER_TODO(color_set_stroking_space_to_cmyk);
RENDERER_TODO(color_set_painting_space_to_cmyk);
RENDERER_HANDLER(set_stroking_space)
{
state().stroke_color_space = get_color_space(args[0]);
state().stroke_color = ColorSpace::default_color_for_color_space(state().stroke_color_space);
}
RENDERER_HANDLER(set_painting_space)
{
state().paint_color_space = get_color_space(args[0]);
state().paint_color = ColorSpace::default_color_for_color_space(state().paint_color_space);
}
RENDERER_HANDLER(set_stroking_color)
{
state().stroke_color = ColorSpace::color_from_parameters(state().stroke_color_space, args);
}
RENDERER_TODO(set_stroking_color_extended);
RENDERER_HANDLER(set_painting_color)
{
state().paint_color = ColorSpace::color_from_parameters(state().paint_color_space, args);
}
RENDERER_TODO(set_painting_color_extended);
RENDERER_HANDLER(set_stroking_color_and_space_to_gray)
{
state().stroke_color_space = ColorSpace::Type::DeviceGray;
state().stroke_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceGray, args);
}
RENDERER_HANDLER(set_painting_color_and_space_to_gray)
{
state().paint_color_space = ColorSpace::Type::DeviceGray;
state().paint_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceGray, args);
}
RENDERER_HANDLER(set_stroking_color_and_space_to_rgb)
{
state().stroke_color_space = ColorSpace::Type::DeviceRGB;
state().stroke_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceRGB, args);
}
RENDERER_HANDLER(set_painting_color_and_space_to_rgb)
{
state().paint_color_space = ColorSpace::Type::DeviceRGB;
state().paint_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceRGB, args);
}
RENDERER_HANDLER(set_stroking_color_and_space_to_cmyk)
{
state().stroke_color_space = ColorSpace::Type::DeviceCMYK;
state().stroke_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceCMYK, args);
}
RENDERER_HANDLER(set_painting_color_and_space_to_cmyk)
{
state().paint_color_space = ColorSpace::Type::DeviceCMYK;
state().paint_color = ColorSpace::color_from_parameters(ColorSpace::Type::DeviceCMYK, args);
}
RENDERER_TODO(shade);
RENDERER_TODO(inline_image_begin);
RENDERER_TODO(inline_image_begin_data);
@ -419,6 +522,12 @@ Gfx::Size<T> Renderer::map(Gfx::Size<T> size) const
return state().ctm.map(size);
}
template<typename T>
Gfx::Rect<T> Renderer::map(Gfx::Rect<T> rect) const
{
return state().ctm.map(rect);
}
void Renderer::show_text(const String& string, int shift)
{
auto utf = Utf8View(string);
@ -449,6 +558,18 @@ void Renderer::show_text(const String& string, int shift)
}
}
ColorSpace::Type Renderer::get_color_space(const Value& value)
{
auto name = object_cast<NameObject>(value.as_object())->name();
auto color_space_opt = ColorSpace::color_space_from_string(name);
if (!color_space_opt.has_value()) {
// The name is probably a key into the resource dictionary
TODO();
}
return color_space_opt.value();
}
const Gfx::AffineTransform& Renderer::calculate_text_rendering_matrix()
{
if (m_text_rendering_matrix_is_dirty) {