skia2/docs/SkImage_Reference.bmh

#Topic Image
#Alias Image_Reference

#Class SkImage

SkImage is an abstraction for drawing a rectangle of pixels, though the
particular type of image could be actually storing its data on the GPU, or
as drawing commands (picture or PDF or otherwise), ready to be played back
into another canvas.
The content of SkImage is always immutable, though the actual storage may
change, if for example that image can be re-created via encoded data or
other means.
SkImage always has a non-zero dimensions. If there is a request to create a new
image, either directly or via SkSurface, and either of the requested dimensions
are zero, then nullptr will be returned.

#Topic Overview

#Subtopic Subtopics
#ToDo manually add subtopics ##
#Table
#Legend
# topics # description ##
#Legend ##
#Table ##
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#Subtopic Structs
#Table
#Legend
# description                     # struct ##
#Legend ##
# DeferredTextureImageUsageParams # ##
#Table ##
#Subtopic ##

#Subtopic Member_Functions
#Table
#Legend
# description                      # function ##
#Legend ##
# MakeFromAHardwareBuffer          # ##
# MakeBackendTextureFromSkImage    # ##
# MakeCrossContextFromEncoded      # ##
# MakeFromAHardwareBuffer          # ##
# MakeFromAdoptedTexture           # ##
# MakeFromBitmap                   # ##
# MakeFromDeferredTextureImageData # ##
# MakeFromEncoded                  # ##
# MakeFromGenerator                # ##
# MakeFromNV12TexturesCopy         # ##
# MakeFromPicture                  # ##
# MakeFromRaster                   # ##
# MakeFromTexture                  # ##
# MakeFromYUVTexturesCopy          # ##
# MakeRasterCopy                   # ##
# MakeRasterData                   # ##
# alphaType                        # ##
# asLegacyBitmap                   # ##
# bounds                           # ##
# colorSpace                       # ##
# dimensions                       # ##
# encodeToData                     # ##
# getDeferredTextureImageData      # ##
# getTexture                       # ##
# getTextureHandle                 # ##
# height                           # ##
# isAlphaOnly                      # ##
# isLazyGenerated                  # ##
# isOpaque                         # ##
# isTextureBacked                  # ##
# isValid                          # ##
# makeColorSpace                   # ##
# makeNonTextureImage              # ##
# makeShader                       # ##
# makeSubset                       # ##
# makeTextureImage                 # ##
# makeWithFilter                   # ##
# peekPixels                       # ##
# readPixels                       # ##
# refColorSpace                    # ##
# refEncodedData                   # ##
# scalePixels                      # ##
# toString                         # ##
# uniqueID                         # ##
# width                            # ##
#Table ##
#Subtopic ##

#Topic ##

# ------------------------------------------------------------------------------

#Struct DeferredTextureImageUsageParams

#Code
#ToDo fill this in manually ##
##

Drawing parameters for which a deferred texture image data should be optimized. */

# ------------------------------------------------------------------------------

#Method DeferredTextureImageUsageParams(const SkMatrix matrix, const SkFilterQuality quality,
                                        int preScaleMipLevel)

#Param matrix  incomplete ##
#Param quality  incomplete ##
#Param preScaleMipLevel  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

#Member SkMatrix  fMatrix
##

#Member SkFilterQuality  fQuality
##

#Member int  fPreScaleMipLevel
##

#Struct DeferredTextureImageUsageParams ##

#Typedef SkImageInfo Info

##

#Typedef void* ReleaseContext

##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeRasterCopy(const SkPixmap& pixmap)

#Param pixmap  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeRasterData(const Info& info, sk_sp<SkData> pixels, size_t rowBytes)

#Param info  incomplete ##
#Param pixels  incomplete ##
#Param rowBytes  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Typedef void (*RasterReleaseProc)(const void* pixels, ReleaseContext)

##

#Method static sk_sp<SkImage> MakeFromRaster(const SkPixmap& pixmap,
                                         RasterReleaseProc rasterReleaseProc,
                                         ReleaseContext releaseContext)

Return a new Image referencing the specified pixels. These must remain valid and unchanged
until the specified release-proc is called, indicating that Skia no longer has a reference
to the pixels.
Returns nullptr if the requested pixmap info is unsupported.

#Param pixmap  incomplete ##
#Param rasterReleaseProc  incomplete ##
#Param releaseContext  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromBitmap(const SkBitmap& bitmap)

Construct a new image from the specified bitmap. If the bitmap is marked immutable, and
its pixel memory is shareable, it may be shared instead of copied.

#Param bitmap  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromGenerator(std::unique_ptr<SkImageGenerator> imageGenerator,
                                            const SkIRect* subset = nullptr)

Construct a new SkImage based on the given ImageGenerator. Returns nullptr on error.
This function will always take ownership of the passed generator.
If a subset is specified, it must be contained within the generator's bounds.

#Param imageGenerator  incomplete ##
#Param subset  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset = nullptr)

Construct a new SkImage based on the specified encoded data. Returns nullptr on failure,
which can mean that the format of the encoded data was not recognized/supported.
If a subset is specified, it must be contained within the encoded data's bounds.

#Param encoded  incomplete ##
#Param subset  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Typedef void (*TextureReleaseProc)(ReleaseContext releaseContext)

##

#Method static sk_sp<SkImage> MakeFromTexture(GrContext* context,
                                          const GrBackendTexture& backendTexture,
                                          GrSurfaceOrigin origin,
                                          SkAlphaType alphaType,
                                          sk_sp<SkColorSpace> colorSpace)

Create a new image from the specified descriptor. Note - the caller is responsible for
managing the lifetime of the underlying platform texture.
Will return nullptr if the specified back-end texture is unsupported.

#Param context  incomplete ##
#Param backendTexture  incomplete ##
#Param origin  incomplete ##
#Param alphaType  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromTexture(GrContext* context,
                                          const GrBackendTexture& backendTexture,
                                          GrSurfaceOrigin origin,
                                          SkAlphaType alphaType,
                                          sk_sp<SkColorSpace> colorSpace,
                                          TextureReleaseProc textureReleaseProc,
                                          ReleaseContext releaseContext)

Create a new image from the GrBackendTexture. The underlying platform texture must stay
valid and unaltered until the specified release-proc is invoked, indicating that Skia
no longer is holding a reference to it.
Will return nullptr if the specified back-end texture is unsupported.

#Param context  incomplete ##
#Param backendTexture  incomplete ##
#Param origin  incomplete ##
#Param alphaType  incomplete ##
#Param colorSpace  incomplete ##
#Param textureReleaseProc  incomplete ##
#Param releaseContext  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeCrossContextFromEncoded(GrContext* context, sk_sp<SkData> data,
                                                      bool buildMips,
                                                      SkColorSpace* dstColorSpace)

Decodes and uploads the encoded data to a GPU backed image using the supplied GrContext.
That image can be safely used by other GrContexts, across thread boundaries. The GrContext
used here, and the ones used to draw this image later must be in the same OpenGL share group,
or otherwise be able to share resources.
When the image's ref count reaches zero, the original GrContext will destroy the texture,
asynchronously.
The texture will be decoded and uploaded to be suitable for use with surfaces that have the
supplied destination color space. The color space of the image itself will be determined
from the encoded data.

#Param context  incomplete ##
#Param data  incomplete ##
#Param buildMips  incomplete ##
#Param dstColorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromAdoptedTexture(GrContext* context,
                                                 const GrBackendTexture& backendTexture,
                                                 GrSurfaceOrigin surfaceOrigin,
                                                 SkAlphaType alphaType = kPremul_SkAlphaType,
                                                 sk_sp<SkColorSpace> colorSpace = nullptr)

Create a new image from the specified descriptor. Note - Skia will delete or recycle the
texture when the image is released.
Will return nullptr if the specified back-end texture is unsupported.

#Param context  incomplete ##
#Param backendTexture  incomplete ##
#Param surfaceOrigin  incomplete ##
#Param alphaType  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromYUVTexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace,
                                                  const GrBackendObject yuvTextureHandles[3],
                                                  const SkISize yuvSizes[3],
                                                  GrSurfaceOrigin surfaceOrigin,
                                                  sk_sp<SkColorSpace> colorSpace = nullptr)

Create a new image by copying the pixels from the specified y, u, v textures. The data
from the textures is immediately ingested into the image and the textures can be modified or
deleted after the function returns. The image will have the dimensions of the y texture.

#Param context  incomplete ##
#Param yuvColorSpace  incomplete ##
#Param yuvTextureHandles  incomplete ##
#Param yuvSizes  incomplete ##
#Param surfaceOrigin  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromNV12TexturesCopy(GrContext* context,
                                                   SkYUVColorSpace yuvColorSpace,
                                                   const GrBackendObject nv12TextureHandles[2],
                                                   const SkISize nv12Sizes[2],
                                                   GrSurfaceOrigin surfaceOrigin,
                                                   sk_sp<SkColorSpace> colorSpace = nullptr)

Create a new image by copying the pixels from the specified y and UV_Mapping. The data
from the textures is immediately ingested into the image and the textures can be modified or
deleted after the function returns. The image will have the dimensions of the y texture.

#Param context  incomplete ##
#Param yuvColorSpace  incomplete ##
#Param nv12TextureHandles  incomplete ##
#Param nv12Sizes  incomplete ##
#Param surfaceOrigin  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Enum BitDepth

#Code
    enum BitDepth {
        kU8,
        kF16,
    };
##

#Const kU8 0
##
#Const kF16 1
##

#Example
// incomplete
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#SeeAlso incomplete

#Enum ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromPicture(sk_sp<SkPicture> picture, const SkISize& dimensions,
                                          const SkMatrix* matrix, const SkPaint* paint,
                                          BitDepth bitDepth,
                                          sk_sp<SkColorSpace> colorSpace)

Create a new image from the specified picture.
On creation of the SkImage, snap the SkPicture to a particular BitDepth and SkColorSpace.

#Param picture  incomplete ##
#Param dimensions  incomplete ##
#Param matrix  incomplete ##
#Param paint  incomplete ##
#Param bitDepth  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromAHardwareBuffer(AHardwareBuffer* hardwareBuffer,
                                                 SkAlphaType alphaType = kPremul_SkAlphaType,
                                                 sk_sp<SkColorSpace> colorSpace = nullptr)

    Create a new image from the an Android hardware buffer.
    The new image takes a reference on the buffer.

    Only available on Android, when __ANDROID_API__ is defined to be 26 or greater.

#Param hardwareBuffer  incomplete ##
#Param alphaType  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromAHardwareBuffer(AHardwareBuffer* hardwareBuffer,
                                                 SkAlphaType alphaType = kPremul_SkAlphaType,
                                                 sk_sp<SkColorSpace> colorSpace = nullptr)

Create a new image from the an Android hardware buffer.
The new image takes a reference on the buffer.

#Param hardwareBuffer  incomplete ##
#Param alphaType  incomplete ##
#Param colorSpace  incomplete ##

#Return incomplete ##

#Example
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method int width() const

#Return incomplete ##

#Example
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#SeeAlso incomplete

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# ------------------------------------------------------------------------------

#Method int height() const

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method SkISize dimensions() const

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method SkIRect bounds() const

#Return incomplete ##

#Example
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# ------------------------------------------------------------------------------

#Method uint32_t uniqueID() const

#Return incomplete ##

#Example
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# ------------------------------------------------------------------------------

#Method SkAlphaType alphaType() const

#Return incomplete ##

#Example
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method SkColorSpace* colorSpace() const

Returns Color_Space of Image. Color_Space may have been a parameter when
Image was created, or may have been parsed from encoded data. Skia may not be
able to draw image respecting returned Color_Space or draw into Surface with
returned Color_Space.

#Return Color_Space Image was created with, or nullptr ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkColorSpace> refColorSpace() const

#Return incomplete ##

#Example
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool isAlphaOnly() const

Returns true fi the image will be drawn as a mask, with no intrinsic color of its own.

#Return incomplete ##

#Example
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool isOpaque() const

#Return incomplete ##

#Example
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkShader> makeShader(SkShader::TileMode tileMode1, SkShader::TileMode tileMode2,
                               const SkMatrix* localMatrix = nullptr) const

#Param tileMode1  incomplete ##
#Param tileMode2  incomplete ##
#Param localMatrix  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const

Helper version of makeShader() that specifies SkShader::kClamp_TileMode.

#Param localMatrix  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool peekPixels(SkPixmap* pixmap) const

If the image has direct access to its pixels (i.e. they are in local RAM)
return true, and if not null, return in the pixmap parameter the info about the
images pixels.
On failure, return false and ignore the pixmap parameter.

#Param pixmap  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method GrTexture* getTexture() const

DEPRECATED - 
#Private
currently used by Canvas2DLayerBridge in Chromium.
##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool isTextureBacked() const

Returns true if the image is texture backed.

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool isValid(GrContext* context) const

Returns true if Image can be drawn. If context
is nullptr, tests if Image draws on Raster_Surface; Otherwise, tests if Image
draws on GPU_Surface associated with context.

Texture-backed images may become invalid if their underlying GrContext is abandoned. Some
generator-backed images may be invalid for CPU and/or GPU.

#Param context  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method GrBackendObject getTextureHandle(bool flushPendingGrContextIO,
                                     GrSurfaceOrigin* origin = nullptr) const

Retrieves the back-end API handle of the texture. If flushPendingGrContextIO then the
GrContext will issue to the back-end API any deferred I/O operations on the texture before
returning.
If 'origin' is supplied it will be filled in with the origin of the content drawn
into the image.

#Param flushPendingGrContextIO  incomplete ##
#Param origin  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Enum CachingHint

#Code
    enum CachingHint {
        kAllow_CachingHint,
        kDisallow_CachingHint,
    };
##

Hints to image calls where the system might cache computed intermediates (e.g. the results
of decoding or a read-back from the GPU. Passing kAllow_CachingHint signals that the system's default
behavior is fine. Passing kDisallow_CachingHint signals that caching should be avoided.

#Const kAllow_CachingHint 0
##
#Const kDisallow_CachingHint 1
##

#Example
// incomplete
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#SeeAlso incomplete

#Enum ##

# ------------------------------------------------------------------------------

#Method bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
                    int srcX, int srcY, CachingHint cachingHint = kAllow_CachingHint) const

Copy the pixels from the image into the specified buffer (dstPixels + dstRowBytes),
converting them into the requested format (dstInfo). The image pixels are read
starting at the specified (srcX, srcY) location.
dstInfo and (srcX, srcY) offset specifies a source rectangle:
#Code
SkRect srcR;
srcR.setXYWH(srcX, srcY, dstInfo.width(), dstInfo.height());
##

The source rectangle is intersected with the bounds of the image. If this intersection is not empty,
then we have two sets of pixels (of equal size). Replace dstPixels with the
corresponding Image pixels, performing any Color_Type/Alpha_Type transformations needed
(in the case where Image and dstInfo have different Color_Types or Alpha_Types).
This call can fail, returning false, for several reasons:
if source rectangle does not intersect the image bounds;
if the requested Color_Type/Alpha_Type cannot be converted from the image's types.

#Param dstInfo  incomplete ##
#Param dstPixels  incomplete ##
#Param dstRowBytes  incomplete ##
#Param srcX  incomplete ##
#Param srcY  incomplete ##
#Param cachingHint  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool readPixels(const SkPixmap& dst, int srcX, int srcY,
                    CachingHint cachingHint = kAllow_CachingHint) const

#Param dst  incomplete ##
#Param srcX  incomplete ##
#Param srcY  incomplete ##
#Param cachingHint  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method bool scalePixels(const SkPixmap& dst, SkFilterQuality filterQuality,
                     CachingHint cachingHint = kAllow_CachingHint) const

Copies Image pixels into dst, converting to dst Color_Type and Alpha_Type.
If the conversion cannot be performed, false is returned.
If dst dimensions differ from Image dimensions, Image is scaled, applying
filterQuality.

#Param dst  incomplete ##
#Param filterQuality  incomplete ##
#Param cachingHint  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkData> encodeToData(SkEncodedImageFormat encodedImageFormat, int quality) const

Encode the image's pixels and return the result as SkData.
If the image type cannot be encoded, or the requested encoder format is
not supported, this will return nullptr.

#Param encodedImageFormat  incomplete ##
#Param quality  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkData> encodeToData(SkPixelSerializer* pixelSerializer = nullptr) const

Encodes Image and returns result as SkData. Will reuse existing encoded data
if present, as returned by refEncodedData. pixelSerializer validates existing
encoded data, and encodes Image when existing encoded data is missing or
invalid.

Passing nullptr for pixelSerializer selects default serialization which 
accepts all data and encodes to PNG.

Returns nullptr if existing encoded data is missing or invalid and 
encoding fails.

#Param pixelSerializer  incomplete ##

#Return incomplete ##

#Example
// incomplete
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#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkData> refEncodedData() const

If the image already has its contents in encoded form (e.g. PNG or JPEG), return that
as SkData. If the image does not already has its contents in encoded form, return nullptr.

To force the image to return its contents as encoded data, call encodeToData.

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method const char* toString(SkString* string) const

#Param string  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkImage> makeSubset(const SkIRect& subset) const

Return a new image that is a subset of this image. The underlying implementation may
share the pixels, or it may make a copy.
If subset does not intersect the bounds of this image, or the copy/share cannot be made,
nullptr will be returned.

#Param subset  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkImage> makeTextureImage(GrContext* context, SkColorSpace* dstColorSpace) const

Ensures that an image is backed by a texture (when GrContext is non-null), suitable for use
with surfaces that have the supplied destination color space. If no transformation is
required, the returned image may be the same as this image. If this image is from a
different GrContext, this will fail.

#Param context  incomplete ##
#Param dstColorSpace  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkImage> makeNonTextureImage() const

If the image is texture-backed this will make a raster copy of it (or nullptr if reading back
the pixels fails). Otherwise, it returns the original image.

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method sk_sp<SkImage> makeWithFilter(const SkImageFilter* filter, const SkIRect& subset,
                                  const SkIRect& clipBounds, SkIRect* outSubset,
                                  SkIPoint* offset) const

Apply a given image filter to this image, and return the filtered result.
The subset represents the active portion of this image. The return value is similarly an
SkImage, with an active subset (outSubset). This is usually used with texture-backed
images, where the texture may be approx-match and thus larger than the required size.
clipBounds constrains the device-space extent of the image, stored in outSubset.
offset is storage, set to the amount to translate the result when drawn.
If the result image cannot be created, or the result would be transparent black, null
is returned, in which case the offset and outSubset parameters should be ignored by the
caller.

#Param filter  incomplete ##
#Param subset  incomplete ##
#Param clipBounds  incomplete ##
#Param outSubset  incomplete ##
#Param offset  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method size_t getDeferredTextureImageData(const GrContextThreadSafeProxy& contextThreadSafeProxy,
                            const DeferredTextureImageUsageParams deferredTextureImageUsageParams[],
                            int paramCnt,
                            void* buffer,
                            SkColorSpace* dstColorSpace = nullptr,
                            SkColorType dstColorType = kN32_SkColorType) const

This method allows clients to capture the data necessary to turn a SkImage into a texture-
backed image. If the original image is codec-backed this will decode into a format optimized
for the context represented by the proxy. This method is thread safe with respect to the
GrContext whence the proxy came. Clients allocate and manage the storage of the deferred
texture data and control its lifetime. No cleanup is required, thus it is safe to simply free
the memory out from under the data.

The same method is used both for getting the size necessary for uploading
and retrieving texture data. The deferredTextureImageUsageParams array represents the set of
draws over which to optimize the texture data prior to uploading.

When called with a null buffer this returns the size that the client must allocate in order
to create deferred texture data for this image (or zero if this is an inappropriate
candidate). The buffer allocated by the client should be 8 byte aligned.
When buffer is not null this fills in the deferred texture data for this image in the
provided buffer (assuming this is an appropriate candidate image and the buffer is
appropriately aligned). Upon success the size written is returned, otherwise 0.
dstColorSpace is the color space of the surface where this texture will ultimately be used.
If the method determines that Mip_Maps are needed, this helps determine the correct strategy
for building them (gamma-correct or not).

dstColorType is the color type of the surface where this texture will ultimately be used.
This determines the format with which the image will be uploaded to the GPU. If dstColorType
does not support color spaces (low bit depth types such as kARGB_4444_SkColorType), then dstColorSpace
must be null.

#Param contextThreadSafeProxy  incomplete ##
#Param deferredTextureImageUsageParams  incomplete ##
#Param paramCnt  incomplete ##
#Param buffer  incomplete ##
#Param dstColorSpace  incomplete ##
#Param dstColorType  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Method static sk_sp<SkImage> MakeFromDeferredTextureImageData(GrContext* context, const void* data,
                                                           SkBudgeted budgeted)

Returns a texture-backed image from data produced in SkImage::getDeferredTextureImageData.
The context must be the context that provided the proxy passed to
getDeferredTextureImageData.

#Param context  incomplete ##
#Param data  incomplete ##
#Param budgeted  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

#Typedef std::function<void(GrBackendTexture)> BackendTextureReleaseProc

##

# ------------------------------------------------------------------------------

#Method static bool MakeBackendTextureFromSkImage(GrContext* context,
                                              sk_sp<SkImage> image,
                                              GrBackendTexture* backendTexture,
                                              BackendTextureReleaseProc* backendTextureReleaseProc)

Creates a GrBackendTexture from the provided SkImage. Returns true on success. The
GrBackendTexture and BackendTextureReleaseProc are populated on success. It is the callers
responsibility to call the BackendTextureReleaseProc once they have deleted the texture.
Note that the BackendTextureReleaseProc allows Skia to clean up auxiliary data related
to the GrBackendTexture, and is not a substitute for the client deleting the GrBackendTexture
themselves.

If image is both texture backed and singly referenced; that is, its only
reference was transferred using std::move(): image is returned in backendTexture
without conversion or making a copy. 

If the SkImage is not texture backed, this function will generate a texture with the image's
contents and return that.

#Param context  incomplete ##
#Param image  incomplete ##
#Param backendTexture  incomplete ##
#Param backendTextureReleaseProc  incomplete ##

#Return incomplete ##

#Example
// incomplete
##

#SeeAlso incomplete

#Method ##

# ------------------------------------------------------------------------------

#Enum LegacyBitmapMode

#Code
    enum LegacyBitmapMode {
        kRO_LegacyBitmapMode,
        kRW_LegacyBitmapMode,
    };
##

Helper functions to convert to SkBitmap

#Const kRO_LegacyBitmapMode 0
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#Const kRW_LegacyBitmapMode 1
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#Example
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#SeeAlso incomplete

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#Method bool asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode legacyBitmapMode) const

Attempt to create a bitmap with the same pixels as the image. The result will always be
a raster-backed bitmap (texture-backed bitmaps are DEPRECATED, and not supported here).
If the mode is kRO_LegacyBitmapMode (read-only), the resulting bitmap will be marked as immutable.
On success, returns true. On failure, returns false and the bitmap parameter will be reset
to empty.

#Param bitmap  incomplete ##
#Param legacyBitmapMode  incomplete ##

#Return incomplete ##

#Example
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#Method bool isLazyGenerated() const

Returns true if Image is backed by an image-generator or other service that creates
and caches its pixels or texture on-demand.

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#Example
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#Method sk_sp<SkImage> makeColorSpace(sk_sp<SkColorSpace> target,
                                  SkTransferFunctionBehavior premulBehavior) const

If target is supported, returns an SkImage in target color space.
Otherwise, returns nullptr.
This will leave the image as is if it already in target color space.
Otherwise, it will convert the pixels from Image color space to target
color space.  If this->colorSpace() is nullptr, Image color space will be
treated as sRGB.

If premulBehavior is SkTransferFunctionBehavior::kRespect: converts Image
pixels to a linear space before converting to match destination Color_Type
and Color_Space.
If premulBehavior is SkTransferFunctionBehavior::kIgnore: Image
pixels are treated as if they are linear, regardless of how they are encoded.

#Param target  incomplete ##
#Param premulBehavior  incomplete ##

#Return incomplete ##

#Example
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#Class SkImage ##

#Topic Image ##