LibGfx+icc: Stringify known signatureType values

Userland/Libraries/LibGfx/ICC/TagTypes.cpp

@@ -7,6 +7,7 @@
 #include <AK/DeprecatedString.h>
 #include <AK/Endian.h>
 #include <LibGfx/ICC/TagTypes.h>
+#include <LibGfx/ICC/Tags.h>
 #include <LibTextCodec/Decoder.h>
 
 namespace Gfx::ICC {
@@ -975,6 +976,126 @@ ErrorOr<NonnullRefPtr<SignatureTagData>> SignatureTagData::from_bytes(ReadonlyBy
     return adopt_ref(*new SignatureTagData(offset, size, signature));
 }
 
+Optional<StringView> SignatureTagData::colorimetric_intent_image_state_signature_name(u32 colorimetric_intent_image_state)
+{
+    // Table 26 — colorimetricIntentImageStateTag signatures
+    switch (colorimetric_intent_image_state) {
+    case 0x73636F65: // 'scoe'
+        return "Scene colorimetry estimates"sv;
+    case 0x73617065: // 'sape'
+        return "Scene appearance estimates"sv;
+    case 0x66706365: // 'fpce'
+        return "Focal plane colorimetry estimates"sv;
+    case 0x72686F63: // 'rhoc'
+        return "Reflection hardcopy original colorimetry"sv;
+    case 0x72706F63: // 'rpoc'
+        return "Reflection print output colorimetry"sv;
+    }
+    // "Other image state specifications are reserved for future ICC use."
+    return {};
+}
+
+Optional<StringView> SignatureTagData::perceptual_rendering_intent_gamut_signature_name(u32 perceptual_rendering_intent_gamut)
+{
+    // Table 27 — Perceptual rendering intent gamut
+    switch (perceptual_rendering_intent_gamut) {
+    case 0x70726D67: // 'prmg'
+        return "Perceptual reference medium gamut"sv;
+    }
+    // "It is possible that the ICC will define other signature values in the future."
+    return {};
+}
+
+Optional<StringView> SignatureTagData::saturation_rendering_intent_gamut_signature_name(u32 saturation_rendering_intent_gamut)
+{
+    // Table 28 — Saturation rendering intent gamut
+    switch (saturation_rendering_intent_gamut) {
+    case 0x70726D67: // 'prmg'
+        return "Perceptual reference medium gamut"sv;
+    }
+    // "It is possible that the ICC will define other signature values in the future."
+    return {};
+}
+
+Optional<StringView> SignatureTagData::technology_signature_name(u32 technology)
+{
+    // Table 29 — Technology signatures
+    switch (technology) {
+    case 0x6673636E: // 'fscn'
+        return "Film scanner"sv;
+    case 0x6463616D: // 'dcam'
+        return "Digital camera"sv;
+    case 0x7273636E: // 'rscn'
+        return "Reflective scanner"sv;
+    case 0x696A6574: // 'ijet'
+        return "Ink jet printer"sv;
+    case 0x74776178: // 'twax'
+        return "Thermal wax printer"sv;
+    case 0x6570686F: // 'epho'
+        return "Electrophotographic printer"sv;
+    case 0x65737461: // 'esta'
+        return "Electrostatic printer"sv;
+    case 0x64737562: // 'dsub'
+        return "Dye sublimation printer"sv;
+    case 0x7270686F: // 'rpho'
+        return "Photographic paper printer"sv;
+    case 0x6670726E: // 'fprn'
+        return "Film writer"sv;
+    case 0x7669646D: // 'vidm'
+        return "Video monitor"sv;
+    case 0x76696463: // 'vidc'
+        return "Video camera"sv;
+    case 0x706A7476: // 'pjtv'
+        return "Projection television"sv;
+    case 0x43525420: // 'CRT '
+        return "Cathode ray tube display"sv;
+    case 0x504D4420: // 'PMD '
+        return "Passive matrix display"sv;
+    case 0x414D4420: // 'AMD '
+        return "Active matrix display"sv;
+    case 0x4C434420: // 'LCD '
+        return "Liquid crystal display"sv;
+    case 0x4F4C4544: // 'OLED'
+        return "Organic LED display"sv;
+    case 0x4B504344: // 'KPCD'
+        return "Photo CD"sv;
+    case 0x696D6773: // 'imgs'
+        return "Photographic image setter"sv;
+    case 0x67726176: // 'grav'
+        return "Gravure"sv;
+    case 0x6F666673: // 'offs'
+        return "Offset lithography"sv;
+    case 0x73696C6B: // 'silk'
+        return "Silkscreen"sv;
+    case 0x666C6578: // 'flex'
+        return "Flexography"sv;
+    case 0x6D706673: // 'mpfs'
+        return "Motion picture film scanner"sv;
+    case 0x6D706672: // 'mpfr'
+        return "Motion picture film recorder"sv;
+    case 0x646D7063: // 'dmpc'
+        return "Digital motion picture camera"sv;
+    case 0x64636A70: // 'dcpj'
+        return "Digital cinema projector"sv;
+    }
+    // The spec does *not* say that other values are reserved for future use, but it says that for
+    // all other tags using signatureType. So return a {} here too instead of VERIFY_NOT_REACHED().
+    return {};
+}
+
+Optional<StringView> SignatureTagData::name_for_tag(TagSignature tag)
+{
+    if (tag == colorimetricIntentImageStateTag)
+        return colorimetric_intent_image_state_signature_name(signature());
+    if (tag == perceptualRenderingIntentGamutTag)
+        return perceptual_rendering_intent_gamut_signature_name(signature());
+    if (tag == saturationRenderingIntentGamutTag)
+        return saturation_rendering_intent_gamut_signature_name(signature());
+    if (tag == technologyTag)
+        return technology_signature_name(signature());
+    return {};
+}
+
 ErrorOr<NonnullRefPtr<TextTagData>> TextTagData::from_bytes(ReadonlyBytes bytes, u32 offset, u32 size)
 {
     // ICC v4, 10.24 textType

Userland/Libraries/LibGfx/ICC/TagTypes.h

@@ -695,6 +695,13 @@ public:
 
     u32 signature() const { return m_signature; }
 
+    static Optional<StringView> colorimetric_intent_image_state_signature_name(u32);
+    static Optional<StringView> perceptual_rendering_intent_gamut_signature_name(u32);
+    static Optional<StringView> saturation_rendering_intent_gamut_signature_name(u32);
+    static Optional<StringView> technology_signature_name(u32);
+
+    Optional<StringView> name_for_tag(TagSignature);
+
 private:
     u32 m_signature;
 };

Userland/Utilities/icc.cpp

@@ -301,13 +301,13 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         } else if (tag_data->type() == Gfx::ICC::SignatureTagData::Type) {
             auto& signature = static_cast<Gfx::ICC::SignatureTagData&>(*tag_data);
 
-            // FIXME: For colorimetricIntentImageStateTag, interpret signature according to ICC v4 Table 26
-            // FIXME: For perceptualRenderingIntentGamutTag, interpret signature according to ICC v4 Table 27
-            // FIXME: For saturationRenderingIntentGamutTag, interpret signature according to ICC v4 Table 28
-            // FIXME: For technologyTag, interpret signature according to ICC v4 Table 29
-            outln("    signature: '{:c}{:c}{:c}{:c}' / 0x{:08x}",
-                signature.signature() >> 24, (signature.signature() >> 16) & 0xff, (signature.signature() >> 8) & 0xff, signature.signature() & 0xff,
-                signature.signature());
+            if (auto name = signature.name_for_tag(tag_signature); name.has_value()) {
+                outln("    signature: {}", name.value());
+            } else {
+                outln("    signature: Unknown ('{:c}{:c}{:c}{:c}' / 0x{:08x})",
+                    signature.signature() >> 24, (signature.signature() >> 16) & 0xff, (signature.signature() >> 8) & 0xff, signature.signature() & 0xff,
+                    signature.signature());
+            }
         } else if (tag_data->type() == Gfx::ICC::TextDescriptionTagData::Type) {
             auto& text_description = static_cast<Gfx::ICC::TextDescriptionTagData&>(*tag_data);
             outln("    ascii: \"{}\"", text_description.ascii_description());