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