bool valid() const {
return_if_false(fSize >= kICCHeaderSize, "Size is too small");
uint8_t majorVersion = fVersion >> 24;
return_if_false(majorVersion <= 4, "Unsupported version");
// These are the three basic classes of profiles that we might expect to see embedded
// in images. Four additional classes exist, but they generally are used as a convenient
// way for CMMs to store calculated transforms.
const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r');
const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r');
const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r');
return_if_false(fProfileClass == kDisplay_Profile ||
fProfileClass == kInput_Profile ||
fProfileClass == kOutput_Profile,
"Unsupported profile");
// TODO (msarett):
// All the profiles we've tested so far use RGB as the input color space.
return_if_false(fInputColorSpace == kRGB_ColorSpace, "Unsupported color space");
// TODO (msarett):
// All the profiles we've tested so far use XYZ as the profile connection space.
const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' ');
return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space");
return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature");
// TODO (msarett):
// Should we treat different rendering intents differently?
// Valid rendering intents include kPerceptual (0), kRelative (1),
// kSaturation (2), and kAbsolute (3).
return_if_false(fRenderingIntent <= 3, "Bad rendering intent");
return_if_false(color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[0]), 0.96420f) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[1]), 1.00000f) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[2]), 0.82491f),
"Illuminant must be D50");
return_if_false(fTagCount <= 100, "Too many tags");
return true;
}
bool valid() const {
// TODO (msarett):
// For now it's nice to fail loudly on invalid inputs. But, can we
// recover from some of these errors?
return_if_false(fSize >= kICCHeaderSize, "Size is too small");
uint8_t majorVersion = fVersion >> 24;
return_if_false(majorVersion <= 4, "Unsupported version");
const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r');
const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r');
const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r');
// TODO (msarett):
// Should we also support DeviceLink, ColorSpace, Abstract, or NamedColor?
return_if_false(fClassProfile == kDisplay_Profile ||
fClassProfile == kInput_Profile ||
fClassProfile == kOutput_Profile,
"Unsupported class profile");
// TODO (msarett):
// There are many more color spaces that we could try to support.
return_if_false(fColorSpace == kRGB_ColorSpace || fColorSpace == kGray_ColorSpace,
"Unsupported color space");
const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' ');
// TODO (msarett):
// Can we support PCS LAB as well?
return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space");
return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature");
// TODO (msarett):
// Should we treat different rendering intents differently?
// Valid rendering intents include kPerceptual (0), kRelative (1),
// kSaturation (2), and kAbsolute (3).
return_if_false(fRenderingIntent <= 3, "Bad rendering intent");
return_if_false(fTagCount <= 100, "Too many tags");
return true;
}
