uint32_t packed = (fAlphaType << 8) | fColorType;
buffer.write32(packed);
}
+
+bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
+ SkAlphaType* canonical) {
+ switch (colorType) {
+ case kUnknown_SkColorType:
+ alphaType = kIgnore_SkAlphaType;
+ break;
+ case kAlpha_8_SkColorType:
+ if (kUnpremul_SkAlphaType == alphaType) {
+ alphaType = kPremul_SkAlphaType;
+ }
+ // fall-through
+ case kIndex_8_SkColorType:
+ case kARGB_4444_SkColorType:
+ case kRGBA_8888_SkColorType:
+ case kBGRA_8888_SkColorType:
+ if (kIgnore_SkAlphaType == alphaType) {
+ return false;
+ }
+ break;
+ case kRGB_565_SkColorType:
+ alphaType = kOpaque_SkAlphaType;
+ break;
+ default:
+ return false;
+ }
+ if (canonical) {
+ *canonical = alphaType;
+ }
+ return true;
+}