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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageInfo.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
static bool alpha_type_is_valid(SkAlphaType alphaType) {
return (alphaType >= 0) && (alphaType <= kLastEnum_SkAlphaType);
}
static bool color_type_is_valid(SkColorType colorType) {
return (colorType >= 0) && (colorType <= kLastEnum_SkColorType);
}
void SkImageInfo::unflatten(SkReadBuffer& buffer) {
fWidth = buffer.read32();
fHeight = buffer.read32();
uint32_t packed = buffer.read32();
SkASSERT(0 == (packed >> 16));
fAlphaType = (SkAlphaType)((packed >> 8) & 0xFF);
fColorType = (SkColorType)((packed >> 0) & 0xFF);
buffer.validate(alpha_type_is_valid(fAlphaType) &&
color_type_is_valid(fColorType));
}
void SkImageInfo::flatten(SkWriteBuffer& buffer) const {
buffer.write32(fWidth);
buffer.write32(fHeight);
SkASSERT(0 == (fAlphaType & ~0xFF));
SkASSERT(0 == (fColorType & ~0xFF));
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;
}
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