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LibPDF: Add initial implementation of XObject rendering

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This implementation currently handles Form XObjects only, skipping
image XObjects. When rendering an XObject, its resources are passed to
the underlying operations so they use those instead of the Page's.
This commit is contained in:
Rodrigo Tobar 2022-11-21 13:32:09 +08:00 committed by Andreas Kling
parent b3007c17bd
commit cb3e05f476
Notes: sideshowbarker 2024-07-17 03:50:25 +09:00 
Author: https://github.com/rtobar
Commit: https://github.com/SerenityOS/serenity/commit/cb3e05f476
Pull-request: https://github.com/SerenityOS/serenity/pull/16135
Reviewed-by: https://github.com/TobyAsE
Reviewed-by: https://github.com/janso3 ✅
1 changed files with 32 additions and 1 deletions
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33
Userland/Libraries/LibPDF/Renderer.cpp
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@ -620,7 +620,38 @@ RENDERER_TODO(shade)
RENDERER_TODO(inline_image_begin)
RENDERER_TODO(inline_image_begin_data)
RENDERER_TODO(inline_image_end)
RENDERER_TODO(paint_xobject)
RENDERER_HANDLER(paint_xobject)
{
VERIFY(args.size() > 0);
auto resources = extra_resources.value_or(m_page.resources);
auto xobject_name = args[0].get<NonnullRefPtr<Object>>()->cast<NameObject>()->name();
auto xobjects_dict = MUST(resources->get_dict(m_document, CommonNames::XObject));
auto xobject = MUST(xobjects_dict->get_stream(m_document, xobject_name));
auto subtype = MUST(xobject->dict()->get_name(m_document, CommonNames::Subtype))->name();
if (subtype == CommonNames::Image) {
dbgln("Skipping image");
return {};
}
MUST(handle_save_state({}));
Vector<Value> matrix;
if (xobject->dict()->contains(CommonNames::Matrix)) {
matrix = xobject->dict()->get_array(m_document, CommonNames::Matrix).value()->elements();
} else {
matrix = Vector { Value { 1 }, Value { 0 }, Value { 0 }, Value { 1 }, Value { 0 }, Value { 0 } };
}
MUST(handle_concatenate_matrix(matrix));
Optional<NonnullRefPtr<DictObject>> xobject_resources {};
if (xobject->dict()->contains(CommonNames::Resources)) {
xobject_resources = xobject->dict()->get_dict(m_document, CommonNames::Resources).value();
}
auto operators = TRY(Parser::parse_operators(m_document, xobject->bytes()));
for (auto& op : operators)
TRY(handle_operator(op, xobject_resources));
MUST(handle_restore_state({}));
return {};
}
RENDERER_HANDLER(marked_content_point)
{