Object* PixelArray::SetValue(uint32_t index, Object* value) {
uint8_t clamped_value = 0;
if (index < static_cast<uint32_t>(length())) {
- int int_value = 0;
if (value->IsSmi()) {
- int_value = Smi::cast(value)->value();
+ int int_value = Smi::cast(value)->value();
+ if (int_value < 0) {
+ clamped_value = 0;
+ } else if (int_value > 255) {
+ clamped_value = 255;
+ } else {
+ clamped_value = static_cast<uint8_t>(int_value);
+ }
} else if (value->IsHeapNumber()) {
double double_value = HeapNumber::cast(value)->value();
- if (!isnan(double_value)) {
- // NaN clamps to zero (default). Other doubles are rounded to
- // the nearest integer.
- int_value = static_cast<int>(double_value + 0.5);
+ if (!(double_value > 0)) {
+ // NaN and less than zero clamp to zero.
+ clamped_value = 0;
+ } else if (double_value > 255) {
+ // Greater than 255 clamp to 255.
+ clamped_value = 255;
+ } else {
+ // Other doubles are rounded to the nearest integer.
+ clamped_value = static_cast<uint8_t>(double_value + 0.5);
}
} else {
// Clamp undefined to zero (default). All other types have been
// converted to a number type further up in the call chain.
ASSERT(value->IsUndefined());
}
- if (int_value < 0) {
- clamped_value = 0;
- } else if (int_value > 255) {
- clamped_value = 255;
- } else {
- clamped_value = static_cast<uint8_t>(int_value);
- }
set(index, clamped_value);
}
return Smi::FromInt(clamped_value);
CHECK_EQ(0, result->Int32Value());
CHECK_EQ(0, i::Smi::cast(jsobj->GetElement(5))->value());
+ result = CompileRun("for (var i = 0; i < 8; i++) {"
+ " pixels[8] = Infinity;"
+ "}"
+ "pixels[8];");
+ CHECK_EQ(255, result->Int32Value());
+ CHECK_EQ(255, i::Smi::cast(jsobj->GetElement(8))->value());
+
+ result = CompileRun("for (var i = 0; i < 8; i++) {"
+ " pixels[9] = -Infinity;"
+ "}"
+ "pixels[9];");
+ CHECK_EQ(0, result->Int32Value());
+ CHECK_EQ(0, i::Smi::cast(jsobj->GetElement(9))->value());
+
result = CompileRun("pixels[3] = 33;"
"delete pixels[3];"
"pixels[3];");