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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 "SkSafeMath.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
// These values must be constant over revisions, though they can be renamed to reflect if/when
// they are deprecated.
enum Stored_SkColorType {
kUnknown_Stored_SkColorType = 0,
kAlpha_8_Stored_SkColorType = 1,
kRGB_565_Stored_SkColorType = 2,
kARGB_4444_Stored_SkColorType = 3,
kRGBA_8888_Stored_SkColorType = 4,
kBGRA_8888_Stored_SkColorType = 5,
kIndex_8_Stored_SkColorType_DEPRECATED = 6,
kGray_8_Stored_SkColorType = 7,
kRGBA_F16_Stored_SkColorType = 8,
kRGB_888x_Stored_SkColorType = 9,
kRGBA_1010102_Stored_SkColorType = 10,
kRGB_101010x_Stored_SkColorType = 11,
};
static uint8_t live_to_stored(unsigned ct) {
switch (ct) {
case kUnknown_SkColorType: return kUnknown_Stored_SkColorType;
case kAlpha_8_SkColorType: return kAlpha_8_Stored_SkColorType;
case kRGB_565_SkColorType: return kRGB_565_Stored_SkColorType;
case kARGB_4444_SkColorType: return kARGB_4444_Stored_SkColorType;
case kRGBA_8888_SkColorType: return kRGBA_8888_Stored_SkColorType;
case kRGB_888x_SkColorType: return kRGB_888x_Stored_SkColorType;
case kBGRA_8888_SkColorType: return kBGRA_8888_Stored_SkColorType;
case kRGBA_1010102_SkColorType: return kRGBA_1010102_Stored_SkColorType;
case kRGB_101010x_SkColorType: return kRGB_101010x_Stored_SkColorType;
case kGray_8_SkColorType: return kGray_8_Stored_SkColorType;
case kRGBA_F16_SkColorType: return kRGBA_F16_Stored_SkColorType;
}
return kUnknown_Stored_SkColorType;
}
static SkColorType stored_to_live(unsigned stored) {
switch (stored) {
case kUnknown_Stored_SkColorType: return kUnknown_SkColorType;
case kAlpha_8_Stored_SkColorType: return kAlpha_8_SkColorType;
case kRGB_565_Stored_SkColorType: return kRGB_565_SkColorType;
case kARGB_4444_Stored_SkColorType: return kARGB_4444_SkColorType;
case kRGBA_8888_Stored_SkColorType: return kRGBA_8888_SkColorType;
case kRGB_888x_Stored_SkColorType: return kRGB_888x_SkColorType;
case kBGRA_8888_Stored_SkColorType: return kBGRA_8888_SkColorType;
case kRGBA_1010102_Stored_SkColorType: return kRGBA_1010102_SkColorType;
case kRGB_101010x_Stored_SkColorType: return kRGB_101010x_SkColorType;
case kIndex_8_Stored_SkColorType_DEPRECATED: return kUnknown_SkColorType;
case kGray_8_Stored_SkColorType: return kGray_8_SkColorType;
case kRGBA_F16_Stored_SkColorType: return kRGBA_F16_SkColorType;
}
return kUnknown_SkColorType;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
size_t SkImageInfo::computeByteSize(size_t rowBytes) const {
if (0 == fHeight) {
return 0;
}
SkSafeMath safe;
size_t bytes = safe.add(safe.mul(fHeight - 1, rowBytes),
safe.mul(fWidth, this->bytesPerPixel()));
return safe ? bytes : SK_MaxSizeT;
}
static bool alpha_type_is_valid(SkAlphaType alphaType) {
return (alphaType >= kUnknown_SkAlphaType) && (alphaType <= kLastEnum_SkAlphaType);
}
static bool color_type_is_valid(SkColorType colorType) {
return (colorType >= kUnknown_SkColorType) && (colorType <= kLastEnum_SkColorType);
}
SkImageInfo SkImageInfo::MakeS32(int width, int height, SkAlphaType at) {
return SkImageInfo(width, height, kN32_SkColorType, at,
SkColorSpace::MakeSRGB());
}
static const int kColorTypeMask = 0x0F;
static const int kAlphaTypeMask = 0x03;
void SkImageInfo::unflatten(SkReadBuffer& buffer) {
fWidth = buffer.read32();
fHeight = buffer.read32();
uint32_t packed = buffer.read32();
fColorType = stored_to_live((packed >> 0) & kColorTypeMask);
fAlphaType = (SkAlphaType)((packed >> 8) & kAlphaTypeMask);
buffer.validate(alpha_type_is_valid(fAlphaType) && color_type_is_valid(fColorType));
sk_sp<SkData> data = buffer.readByteArrayAsData();
fColorSpace = SkColorSpace::Deserialize(data->data(), data->size());
}
void SkImageInfo::flatten(SkWriteBuffer& buffer) const {
buffer.write32(fWidth);
buffer.write32(fHeight);
SkASSERT(0 == (fAlphaType & ~kAlphaTypeMask));
SkASSERT(0 == (fColorType & ~kColorTypeMask));
uint32_t packed = (fAlphaType << 8) | live_to_stored(fColorType);
buffer.write32(packed);
if (fColorSpace) {
sk_sp<SkData> data = fColorSpace->serialize();
if (data) {
buffer.writeDataAsByteArray(data.get());
} else {
buffer.writeByteArray(nullptr, 0);
}
} else {
sk_sp<SkData> data = SkData::MakeEmpty();
buffer.writeDataAsByteArray(data.get());
}
}
bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
SkAlphaType* canonical) {
switch (colorType) {
case kUnknown_SkColorType:
alphaType = kUnknown_SkAlphaType;
break;
case kAlpha_8_SkColorType:
if (kUnpremul_SkAlphaType == alphaType) {
alphaType = kPremul_SkAlphaType;
}
// fall-through
case kARGB_4444_SkColorType:
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType:
case kRGBA_F16_SkColorType:
if (kUnknown_SkAlphaType == alphaType) {
return false;
}
break;
case kRGB_565_SkColorType:
case kGray_8_SkColorType:
alphaType = kOpaque_SkAlphaType;
break;
default:
return false;
}
if (canonical) {
*canonical = alphaType;
}
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkReadPixelsRec.h"
bool SkReadPixelsRec::trim(int srcWidth, int srcHeight) {
if (nullptr == fPixels || fRowBytes < fInfo.minRowBytes()) {
return false;
}
if (0 >= fInfo.width() || 0 >= fInfo.height()) {
return false;
}
int x = fX;
int y = fY;
SkIRect srcR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
if (!srcR.intersect(0, 0, srcWidth, srcHeight)) {
return false;
}
// if x or y are negative, then we have to adjust pixels
if (x > 0) {
x = 0;
}
if (y > 0) {
y = 0;
}
// here x,y are either 0 or negative
fPixels = ((char*)fPixels - y * fRowBytes - x * fInfo.bytesPerPixel());
// the intersect may have shrunk info's logical size
fInfo = fInfo.makeWH(srcR.width(), srcR.height());
fX = srcR.x();
fY = srcR.y();
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkWritePixelsRec.h"
bool SkWritePixelsRec::trim(int dstWidth, int dstHeight) {
if (nullptr == fPixels || fRowBytes < fInfo.minRowBytes()) {
return false;
}
if (0 >= fInfo.width() || 0 >= fInfo.height()) {
return false;
}
int x = fX;
int y = fY;
SkIRect dstR = SkIRect::MakeXYWH(x, y, fInfo.width(), fInfo.height());
if (!dstR.intersect(0, 0, dstWidth, dstHeight)) {
return false;
}
// if x or y are negative, then we have to adjust pixels
if (x > 0) {
x = 0;
}
if (y > 0) {
y = 0;
}
// here x,y are either 0 or negative
fPixels = ((const char*)fPixels - y * fRowBytes - x * fInfo.bytesPerPixel());
// the intersect may have shrunk info's logical size
fInfo = fInfo.makeWH(dstR.width(), dstR.height());
fX = dstR.x();
fY = dstR.y();
return true;
}
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