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LibPDF: Add initial image display support
After adding support for XObject Form rendering, the next was to display XObject images. This commit adds this initial support, Images come in many shapes and forms: encodings: color spaces, bits per component, width, height, etc. This initial support is constrained to the color spaces we currently support, to images that use 8 bits per component, to images that do *not* use the JPXDecode filter, and that are not Masks. There are surely other constraints that aren't considered in this initial support, so expect breakage here and there. In addition to supporting images, we also support applying an alpha mask (SMask) on them. Additionally, a new rendering preference allows to skip image loading and rendering altogether, instead showing an empty rectangle as a placeholder (useful for when actual images are not supported). Since RenderingPreferences is becoming a bit more complex, we add a hash option that will allow us to keep track of different preferences (e.g., in a HashMap).
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2331fe5e68
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3 changed files with 148 additions and 5 deletions
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@ -86,6 +86,12 @@ struct GraphicsState {
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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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@ -109,6 +115,9 @@ private:
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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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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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@ -127,6 +136,7 @@ private:
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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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