static bool png_conversion_possible(const SkImageInfo& dst, const SkImageInfo& src) {
// Ensure the alpha type is valid
if (!valid_alpha(dst.alphaType(), src.alphaType())) {
return false;
}
// Check for supported color types
switch (dst.colorType()) {
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType:
case kRGBA_F16_SkColorType:
return true;
case kRGB_565_SkColorType:
return kOpaque_SkAlphaType == src.alphaType();
default:
return dst.colorType() == src.colorType();
}
}
/*
* Checks if the conversion between the input image and the requested output
* image has been implemented
*/
static bool conversion_possible(const SkImageInfo& dst,
const SkImageInfo& src) {
// Ensure that the profile type is unchanged
if (dst.profileType() != src.profileType()) {
return false;
}
// Ensure the alpha type is valid
if (!valid_alpha(dst.alphaType(), src.alphaType())) {
return false;
}
// Check for supported color types
switch (dst.colorType()) {
// Allow output to kN32 from any type of input
case kN32_SkColorType:
return true;
// Allow output to kIndex_8 from compatible inputs
case kIndex_8_SkColorType:
return kIndex_8_SkColorType == src.colorType();
default:
return false;
}
}
