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/*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkYUVAPixmaps_DEFINED
#define SkYUVAPixmaps_DEFINED
#include "include/core/SkData.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkYUVAInfo.h"
#include "include/private/base/SkTo.h"
#include <array>
#include <bitset>
class GrImageContext;
/**
* SkYUVAInfo combined with per-plane SkColorTypes and row bytes. Fully specifies the SkPixmaps
* for a YUVA image without the actual pixel memory and data.
*/
class SK_API SkYUVAPixmapInfo {
public:
static constexpr auto kMaxPlanes = SkYUVAInfo::kMaxPlanes;
using PlaneConfig = SkYUVAInfo::PlaneConfig;
using Subsampling = SkYUVAInfo::Subsampling;
/**
* Data type for Y, U, V, and possibly A channels independent of how values are packed into
* planes.
**/
enum class DataType {
kUnorm8, ///< 8 bit unsigned normalized
kUnorm16, ///< 16 bit unsigned normalized
kFloat16, ///< 16 bit (half) floating point
kUnorm10_Unorm2, ///< 10 bit unorm for Y, U, and V. 2 bit unorm for alpha (if present).
kLast = kUnorm10_Unorm2
};
static constexpr int kDataTypeCnt = static_cast<int>(DataType::kLast) + 1;
class SK_API SupportedDataTypes {
public:
/** Defaults to nothing supported. */
constexpr SupportedDataTypes() = default;
/** Init based on texture formats supported by the context. */
SupportedDataTypes(const GrImageContext&);
/** All legal combinations of PlaneConfig and DataType are supported. */
static constexpr SupportedDataTypes All();
/**
* Checks whether there is a supported combination of color types for planes structured
* as indicated by PlaneConfig with channel data types as indicated by DataType.
*/
constexpr bool supported(PlaneConfig, DataType) const;
/**
* Update to add support for pixmaps with numChannel channels where each channel is
* represented as DataType.
*/
void enableDataType(DataType, int numChannels);
private:
// The bit for DataType dt with n channels is at index kDataTypeCnt*(n-1) + dt.
std::bitset<kDataTypeCnt*4> fDataTypeSupport = {};
};
/**
* Gets the default SkColorType to use with numChannels channels, each represented as DataType.
* Returns kUnknown_SkColorType if no such color type.
*/
static constexpr SkColorType DefaultColorTypeForDataType(DataType dataType, int numChannels);
/**
* If the SkColorType is supported for YUVA pixmaps this will return the number of YUVA channels
* that can be stored in a plane of this color type and what the DataType is of those channels.
* If the SkColorType is not supported as a YUVA plane the number of channels is reported as 0
* and the DataType returned should be ignored.
*/
static std::tuple<int, DataType> NumChannelsAndDataType(SkColorType);
/** Default SkYUVAPixmapInfo is invalid. */
SkYUVAPixmapInfo() = default;
/**
* Initializes the SkYUVAPixmapInfo from a SkYUVAInfo with per-plane color types and row bytes.
* This will be invalid if the colorTypes aren't compatible with the SkYUVAInfo or if a
* rowBytes entry is not valid for the plane dimensions and color type. Color type and
* row byte values beyond the number of planes in SkYUVAInfo are ignored. All SkColorTypes
* must have the same DataType or this will be invalid.
*
* If rowBytes is nullptr then bpp*width is assumed for each plane.
*/
SkYUVAPixmapInfo(const SkYUVAInfo&,
const SkColorType[kMaxPlanes],
const size_t rowBytes[kMaxPlanes]);
/**
* Like above but uses DefaultColorTypeForDataType to determine each plane's SkColorType. If
* rowBytes is nullptr then bpp*width is assumed for each plane.
*/
SkYUVAPixmapInfo(const SkYUVAInfo&, DataType, const size_t rowBytes[kMaxPlanes]);
SkYUVAPixmapInfo(const SkYUVAPixmapInfo&) = default;
SkYUVAPixmapInfo& operator=(const SkYUVAPixmapInfo&) = default;
bool operator==(const SkYUVAPixmapInfo&) const;
bool operator!=(const SkYUVAPixmapInfo& that) const { return !(*this == that); }
const SkYUVAInfo& yuvaInfo() const { return fYUVAInfo; }
SkYUVColorSpace yuvColorSpace() const { return fYUVAInfo.yuvColorSpace(); }
/** The number of SkPixmap planes, 0 if this SkYUVAPixmapInfo is invalid. */
int numPlanes() const { return fYUVAInfo.numPlanes(); }
/** The per-YUV[A] channel data type. */
DataType dataType() const { return fDataType; }
/**
* Row bytes for the ith plane. Returns zero if i >= numPlanes() or this SkYUVAPixmapInfo is
* invalid.
*/
size_t rowBytes(int i) const { return fRowBytes[static_cast<size_t>(i)]; }
/** Image info for the ith plane, or default SkImageInfo if i >= numPlanes() */
const SkImageInfo& planeInfo(int i) const { return fPlaneInfos[static_cast<size_t>(i)]; }
/**
* Determine size to allocate for all planes. Optionally retrieves the per-plane sizes in
* planeSizes if not null. If total size overflows will return SIZE_MAX and set all planeSizes
* to SIZE_MAX. Returns 0 and fills planesSizes with 0 if this SkYUVAPixmapInfo is not valid.
*/
size_t computeTotalBytes(size_t planeSizes[kMaxPlanes] = nullptr) const;
/**
* Takes an allocation that is assumed to be at least computeTotalBytes() in size and configures
* the first numPlanes() entries in pixmaps array to point into that memory. The remaining
* entries of pixmaps are default initialized. Fails if this SkYUVAPixmapInfo not valid.
*/
bool initPixmapsFromSingleAllocation(void* memory, SkPixmap pixmaps[kMaxPlanes]) const;
/**
* Returns true if this has been configured with a non-empty dimensioned SkYUVAInfo with
* compatible color types and row bytes.
*/
bool isValid() const { return fYUVAInfo.isValid(); }
/** Is this valid and does it use color types allowed by the passed SupportedDataTypes? */
bool isSupported(const SupportedDataTypes&) const;
private:
SkYUVAInfo fYUVAInfo;
std::array<SkImageInfo, kMaxPlanes> fPlaneInfos = {};
std::array<size_t, kMaxPlanes> fRowBytes = {};
DataType fDataType = DataType::kUnorm8;
static_assert(kUnknown_SkColorType == 0, "default init isn't kUnknown");
};
/**
* Helper to store SkPixmap planes as described by a SkYUVAPixmapInfo. Can be responsible for
* allocating/freeing memory for pixmaps or use external memory.
*/
class SK_API SkYUVAPixmaps {
public:
using DataType = SkYUVAPixmapInfo::DataType;
static constexpr auto kMaxPlanes = SkYUVAPixmapInfo::kMaxPlanes;
static SkColorType RecommendedRGBAColorType(DataType);
/** Allocate space for pixmaps' pixels in the SkYUVAPixmaps. */
static SkYUVAPixmaps Allocate(const SkYUVAPixmapInfo& yuvaPixmapInfo);
/**
* Use storage in SkData as backing store for pixmaps' pixels. SkData is retained by the
* SkYUVAPixmaps.
*/
static SkYUVAPixmaps FromData(const SkYUVAPixmapInfo&, sk_sp<SkData>);
/**
* Makes a deep copy of the src SkYUVAPixmaps. The returned SkYUVAPixmaps owns its planes'
* backing stores.
*/
static SkYUVAPixmaps MakeCopy(const SkYUVAPixmaps& src);
/**
* Use passed in memory as backing store for pixmaps' pixels. Caller must ensure memory remains
* allocated while pixmaps are in use. There must be at least
* SkYUVAPixmapInfo::computeTotalBytes() allocated starting at memory.
*/
static SkYUVAPixmaps FromExternalMemory(const SkYUVAPixmapInfo&, void* memory);
/**
* Wraps existing SkPixmaps. The SkYUVAPixmaps will have no ownership of the SkPixmaps' pixel
* memory so the caller must ensure it remains valid. Will return an invalid SkYUVAPixmaps if
* the SkYUVAInfo isn't compatible with the SkPixmap array (number of planes, plane dimensions,
* sufficient color channels in planes, ...).
*/
static SkYUVAPixmaps FromExternalPixmaps(const SkYUVAInfo&, const SkPixmap[kMaxPlanes]);
/** Default SkYUVAPixmaps is invalid. */
SkYUVAPixmaps() = default;
~SkYUVAPixmaps() = default;
SkYUVAPixmaps(SkYUVAPixmaps&& that) = default;
SkYUVAPixmaps& operator=(SkYUVAPixmaps&& that) = default;
SkYUVAPixmaps(const SkYUVAPixmaps&) = default;
SkYUVAPixmaps& operator=(const SkYUVAPixmaps& that) = default;
/** Does have initialized pixmaps compatible with its SkYUVAInfo. */
bool isValid() const { return !fYUVAInfo.dimensions().isEmpty(); }
const SkYUVAInfo& yuvaInfo() const { return fYUVAInfo; }
DataType dataType() const { return fDataType; }
SkYUVAPixmapInfo pixmapsInfo() const;
/** Number of pixmap planes or 0 if this SkYUVAPixmaps is invalid. */
int numPlanes() const { return this->isValid() ? fYUVAInfo.numPlanes() : 0; }
/**
* Access the SkPixmap planes. They are default initialized if this is not a valid
* SkYUVAPixmaps.
*/
const std::array<SkPixmap, kMaxPlanes>& planes() const { return fPlanes; }
/**
* Get the ith SkPixmap plane. SkPixmap will be default initialized if i >= numPlanes or this
* SkYUVAPixmaps is invalid.
*/
const SkPixmap& plane(int i) const { return fPlanes[SkToSizeT(i)]; }
/**
* Computes a YUVALocations representation of the planar layout. The result is guaranteed to be
* valid if this->isValid().
*/
SkYUVAInfo::YUVALocations toYUVALocations() const;
/** Does this SkPixmaps own the backing store of the planes? */
bool ownsStorage() const { return SkToBool(fData); }
private:
SkYUVAPixmaps(const SkYUVAPixmapInfo&, sk_sp<SkData>);
SkYUVAPixmaps(const SkYUVAInfo&, DataType, const SkPixmap[kMaxPlanes]);
std::array<SkPixmap, kMaxPlanes> fPlanes = {};
sk_sp<SkData> fData;
SkYUVAInfo fYUVAInfo;
DataType fDataType;
};
//////////////////////////////////////////////////////////////////////////////
constexpr SkYUVAPixmapInfo::SupportedDataTypes SkYUVAPixmapInfo::SupportedDataTypes::All() {
using ULL = unsigned long long; // bitset cons. takes this.
ULL bits = 0;
for (ULL c = 1; c <= 4; ++c) {
for (ULL dt = 0; dt <= ULL(kDataTypeCnt); ++dt) {
if (DefaultColorTypeForDataType(static_cast<DataType>(dt),
static_cast<int>(c)) != kUnknown_SkColorType) {
bits |= ULL(1) << (dt + static_cast<ULL>(kDataTypeCnt)*(c - 1));
}
}
}
SupportedDataTypes combinations;
combinations.fDataTypeSupport = bits;
return combinations;
}
constexpr bool SkYUVAPixmapInfo::SupportedDataTypes::supported(PlaneConfig config,
DataType type) const {
int n = SkYUVAInfo::NumPlanes(config);
for (int i = 0; i < n; ++i) {
auto c = static_cast<size_t>(SkYUVAInfo::NumChannelsInPlane(config, i));
SkASSERT(c >= 1 && c <= 4);
if (!fDataTypeSupport[static_cast<size_t>(type) +
(c - 1)*static_cast<size_t>(kDataTypeCnt)]) {
return false;
}
}
return true;
}
constexpr SkColorType SkYUVAPixmapInfo::DefaultColorTypeForDataType(DataType dataType,
int numChannels) {
switch (numChannels) {
case 1:
switch (dataType) {
case DataType::kUnorm8: return kGray_8_SkColorType;
case DataType::kUnorm16: return kA16_unorm_SkColorType;
case DataType::kFloat16: return kA16_float_SkColorType;
case DataType::kUnorm10_Unorm2: return kUnknown_SkColorType;
}
break;
case 2:
switch (dataType) {
case DataType::kUnorm8: return kR8G8_unorm_SkColorType;
case DataType::kUnorm16: return kR16G16_unorm_SkColorType;
case DataType::kFloat16: return kR16G16_float_SkColorType;
case DataType::kUnorm10_Unorm2: return kUnknown_SkColorType;
}
break;
case 3:
// None of these are tightly packed. The intended use case is for interleaved YUVA
// planes where we're forcing opaqueness by ignoring the alpha values.
// There are "x" rather than "A" variants for Unorm8 and Unorm10_Unorm2 but we don't
// choose them because 1) there is no inherent advantage and 2) there is better support
// in the GPU backend for the "A" versions.
switch (dataType) {
case DataType::kUnorm8: return kRGBA_8888_SkColorType;
case DataType::kUnorm16: return kR16G16B16A16_unorm_SkColorType;
case DataType::kFloat16: return kRGBA_F16_SkColorType;
case DataType::kUnorm10_Unorm2: return kRGBA_1010102_SkColorType;
}
break;
case 4:
switch (dataType) {
case DataType::kUnorm8: return kRGBA_8888_SkColorType;
case DataType::kUnorm16: return kR16G16B16A16_unorm_SkColorType;
case DataType::kFloat16: return kRGBA_F16_SkColorType;
case DataType::kUnorm10_Unorm2: return kRGBA_1010102_SkColorType;
}
break;
}
return kUnknown_SkColorType;
}
#endif
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