61313f38e1
First cut at splitting bookmaker documentation into reference and overview. Reference starts with a hyperlinked index, generated from a public include. This moves towards typing once, minimizing the information duplicated in the .h file and the .bmh file. TBR=caryclark@google.com Docs-Preview: https://skia.org/?cl=154630 Change-Id: I836622db9b1786bd28c0bce2536cd3caef6e5a32 Reviewed-on: https://skia-review.googlesource.com/c/154630 Commit-Queue: Cary Clark <caryclark@skia.org> Auto-Submit: Cary Clark <caryclark@skia.org> Reviewed-by: Cary Clark <caryclark@skia.org>
145 KiB
SkImage Reference
class SkImage : public SkRefCnt { public: typedef void* ReleaseContext; static sk_sp<SkImage> MakeRasterCopy(const SkPixmap& pixmap); static sk_sp<SkImage> MakeRasterData(const SkImageInfo& info, sk_sp<SkData> pixels, size_t rowBytes); typedef void (*RasterReleaseProc)(const void* pixels, ReleaseContext); static sk_sp<SkImage> MakeFromRaster(const SkPixmap& pixmap, RasterReleaseProc rasterReleaseProc, ReleaseContext releaseContext); static sk_sp<SkImage> MakeFromBitmap(const SkBitmap& bitmap); static sk_sp<SkImage> MakeFromGenerator(std::unique_ptr<SkImageGenerator> imageGenerator, const SkIRect* subset = nullptr); static sk_sp<SkImage> MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset = nullptr); typedef void (*TextureReleaseProc)(ReleaseContext releaseContext); static sk_sp<SkImage> MakeFromTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin origin, SkColorType colorType, SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace); static sk_sp<SkImage> MakeFromTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin origin, SkColorType colorType, SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace, TextureReleaseProc textureReleaseProc, ReleaseContext releaseContext); static sk_sp<SkImage> MakeCrossContextFromEncoded(GrContext* context, sk_sp<SkData> data, bool buildMips, SkColorSpace* dstColorSpace, bool limitToMaxTextureSize = false); static sk_sp<SkImage> MakeCrossContextFromPixmap(GrContext* context, const SkPixmap& pixmap, bool buildMips, SkColorSpace* dstColorSpace, bool limitToMaxTextureSize = false); static sk_sp<SkImage> MakeFromAdoptedTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin surfaceOrigin, SkColorType colorType, SkAlphaType alphaType = kPremul_SkAlphaType, sk_sp<SkColorSpace> colorSpace = nullptr); static sk_sp<SkImage> MakeFromYUVATexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvaTextures[], const SkYUVAIndex yuvaIndices[4], SkISize imageSize, GrSurfaceOrigin imageOrigin, sk_sp<SkColorSpace> imageColorSpace = nullptr); static sk_sp<SkImage> MakeFromYUVATexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvaTextures[], const SkYUVAIndex yuvaIndices[4], SkISize imageSize, GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk_sp<SkColorSpace> imageColorSpace = nullptr); static sk_sp<SkImage> MakeFromYUVTexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvTextures[3], GrSurfaceOrigin imageOrigin, sk_sp<SkColorSpace> imageColorSpace = nullptr); static sk_sp<SkImage> MakeFromYUVTexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvTextures[3], GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk_sp<SkColorSpace> imageColorSpace = nullptr); static sk_sp<SkImage> MakeFromNV12TexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture nv12Textures[2], GrSurfaceOrigin imageOrigin, sk_sp<SkColorSpace> imageColorSpace = nullptr); static sk_sp<SkImage> MakeFromNV12TexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture nv12Textures[2], GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk_sp<SkColorSpace> imageColorSpace = nullptr); enum class BitDepth { kU8, kF16, }; static sk_sp<SkImage> MakeFromPicture(sk_sp<SkPicture> picture, const SkISize& dimensions, const SkMatrix* matrix, const SkPaint* paint, BitDepth bitDepth, sk_sp<SkColorSpace> colorSpace); static sk_sp<SkImage> MakeFromAHardwareBuffer( AHardwareBuffer* hardwareBuffer, SkAlphaType alphaType = kPremul_SkAlphaType, sk_sp<SkColorSpace> colorSpace = nullptr, GrSurfaceOrigin surfaceOrigin = kTopLeft_GrSurfaceOrigin); int width() const; int height() const; SkISize dimensions() const; SkIRect bounds() const; uint32_t uniqueID() const; SkAlphaType alphaType() const; SkColorType colorType() const; SkColorSpace* colorSpace() const; sk_sp<SkColorSpace> refColorSpace() const; bool isAlphaOnly() const; bool isOpaque() const; sk_sp<SkShader> makeShader(SkShader::TileMode tileMode1, SkShader::TileMode tileMode2, const SkMatrix* localMatrix = nullptr) const; sk_sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const; bool peekPixels(SkPixmap* pixmap) const; GrTexture* getTexture() const; bool isTextureBacked() const; bool isValid(GrContext* context) const; GrBackendTexture getBackendTexture(bool flushPendingGrContextIO, GrSurfaceOrigin* origin = nullptr) const; enum CachingHint { kAllow_CachingHint, kDisallow_CachingHint, }; bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, int srcX, int srcY, CachingHint cachingHint = kAllow_CachingHint) const; bool readPixels(const SkPixmap& dst, int srcX, int srcY, CachingHint cachingHint = kAllow_CachingHint) const; bool scalePixels(const SkPixmap& dst, SkFilterQuality filterQuality, CachingHint cachingHint = kAllow_CachingHint) const; sk_sp<SkData> encodeToData(SkEncodedImageFormat encodedImageFormat, int quality) const; sk_sp<SkData> encodeToData() const; sk_sp<SkData> refEncodedData() const; sk_sp<SkImage> makeSubset(const SkIRect& subset) const; sk_sp<SkImage> makeTextureImage(GrContext* context, SkColorSpace* dstColorSpace, GrMipMapped mipMapped = GrMipMapped::kNo) const; sk_sp<SkImage> makeNonTextureImage() const; sk_sp<SkImage> makeRasterImage() const; sk_sp<SkImage> makeWithFilter(const SkImageFilter* filter, const SkIRect& subset, const SkIRect& clipBounds, SkIRect* outSubset, SkIPoint* offset) const; typedef std::function BackendTextureReleaseProc; static bool MakeBackendTextureFromSkImage(GrContext* context, sk_sp<SkImage> image, GrBackendTexture* backendTexture, BackendTextureReleaseProc* backendTextureReleaseProc); enum LegacyBitmapMode { kRO_LegacyBitmapMode, }; bool asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode legacyBitmapMode = kRO_LegacyBitmapMode) const; bool isLazyGenerated() const; sk_sp<SkImage> makeColorSpace(sk_sp<SkColorSpace> target) const; };
Image describes a two dimensional array of pixels to draw. The pixels may be decoded in a Raster Bitmap, encoded in a Picture or compressed data stream, or located in GPU memory as a GPU Texture.
Image cannot be modified after it is created. Image may allocate additional storage as needed; for instance, an encoded Image may decode when drawn.
Image width and height are greater than zero. Creating an Image with zero width or height returns Image equal to nullptr.
Image may be created from Bitmap, Pixmap, Surface, Picture, encoded streams, GPU Texture, YUV ColorSpace data, or hardware buffer. Encoded streams supported include BMP, GIF, HEIF, ICO, JPEG, PNG, WBMP, WebP. Supported encoding details vary with platform.
Raster Image
Raster Image pixels are decoded in a Raster Bitmap. These pixels may be read directly and in most cases written to, although edited pixels may not be drawn if Image has been copied internally.
Texture Image
Texture Image are located on GPU and pixels are not accessible. Texture Image are allocated optimally for best performance. Raster Image may be drawn to GPU Surface, but pixels are uploaded from CPU to GPU downgrading performance.
Lazy Image
Lazy Image defer allocating buffer for Image pixels and decoding stream until Image is drawn. Lazy Image caches result if possible to speed up repeated drawing.
MakeRasterCopy
static sk sp<SkImage> MakeRasterCopy(const SkPixmap& pixmap)
Creates Image from Pixmap and copy of pixels. Since pixels are copied, Pixmap pixels may be modified or deleted without affecting Image.
Image is returned if Pixmap is valid. Valid Pixmap parameters include: dimensions are greater than zero; each dimension fits in 29 bits; Color Type and Alpha Type are valid, and Color Type is not kUnknown_SkColorType; row bytes are large enough to hold one row of pixels; pixel address is not nullptr.
Parameters
pixmap |
Image Info, pixel address, and row bytes |
Return Value
copy of Pixmap pixels, or nullptr
Example
See Also
MakeRasterData MakeFromGenerator
MakeRasterData
static sk sp<SkImage> MakeRasterData(const SkImageInfo& info, sk sp<SkData> pixels, size_t rowBytes)
Creates Image from Image Info, sharing pixels.
Image is returned if Image Info is valid. Valid Image Info parameters include: dimensions are greater than zero; each dimension fits in 29 bits; Color Type and Alpha Type are valid, and Color Type is not kUnknown_SkColorType; rowBytes are large enough to hold one row of pixels; pixels is not nullptr, and contains enough data for Image.
Parameters
info |
contains width, height, Alpha Type, Color Type, Color Space |
pixels |
address or pixel storage |
rowBytes |
size of pixel row or larger |
Return Value
Image sharing pixels, or nullptr
Example
See Also
MakeRasterCopy MakeFromGenerator
Typedef SkImage::ReleaseContext
typedef void* ReleaseContext;
Caller data passed to RasterReleaseProc; may be nullptr.
See Also
MakeFromRaster RasterReleaseProc
Typedef SkImage::RasterReleaseProc
typedef void (*RasterReleaseProc)(const void* pixels, ReleaseContext);
Function called when Image no longer shares pixels. ReleaseContext is provided by caller when Image is created, and may be nullptr.
See Also
MakeFromRaster
static sk sp<SkImage> MakeFromRaster(const SkPixmap& pixmap, RasterReleaseProc rasterReleaseProc, ReleaseContext releaseContext)
Creates Image from pixmap, sharing Pixmap pixels. Pixels must remain valid and unchanged until rasterReleaseProc is called. rasterReleaseProc is passed releaseContext when Image is deleted or no longer refers to pixmap pixels.
Pass nullptr for rasterReleaseProc to share Pixmap without requiring a callback when Image is released. Pass nullptr for releaseContext if rasterReleaseProc does not require state.
Image is returned if pixmap is valid. Valid Pixmap parameters include: dimensions are greater than zero; each dimension fits in 29 bits; Color Type and Alpha Type are valid, and Color Type is not kUnknown_SkColorType; row bytes are large enough to hold one row of pixels; pixel address is not nullptr.
Parameters
pixmap |
Image Info, pixel address, and row bytes |
rasterReleaseProc |
function called when pixels can be released; or nullptr |
releaseContext |
state passed to rasterReleaseProc; or nullptr |
Return Value
Example
Example Output
before reset: 0
after reset: 1
See Also
MakeRasterCopy MakeRasterData MakeFromGenerator RasterReleaseProc ReleaseContext
MakeFromBitmap
static sk sp<SkImage> MakeFromBitmap(const SkBitmap& bitmap)
Creates Image from bitmap, sharing or copying bitmap pixels. If the bitmap is marked immutable, and its pixel memory is shareable, it may be shared instead of copied.
Image is returned if bitmap is valid. Valid Bitmap parameters include: dimensions are greater than zero; each dimension fits in 29 bits; Color Type and Alpha Type are valid, and Color Type is not kUnknown_SkColorType; row bytes are large enough to hold one row of pixels; pixel address is not nullptr.
Parameters
bitmap |
Image Info, row bytes, and pixels |
Return Value
created Image, or nullptr
Example
See Also
MakeFromRaster MakeRasterCopy MakeFromGenerator MakeRasterData
MakeFromGenerator
static sk sp<SkImage> MakeFromGenerator(std::unique_ptr<SkImageGenerator> imageGenerator, const SkIRect* subset = nullptr)
Creates Image from data returned by imageGenerator. Generated data is owned by Image and may not be shared or accessed.
subset allows selecting a portion of the full image. Pass nullptr to select the entire image; otherwise, subset must be contained by image bounds.
Image is returned if generator data is valid. Valid data parameters vary by type of data and platform.
imageGenerator may wrap Picture data, codec data, or custom data.
Parameters
imageGenerator |
stock or custom routines to retrieve Image |
subset |
bounds of returned Image; may be nullptr |
Return Value
created Image, or nullptr
Example
See Also
MakeFromEncoded
static sk sp<SkImage> MakeFromEncoded(sk sp<SkData> encoded, const SkIRect* subset = nullptr)
Creates Image from encoded data. subset allows selecting a portion of the full image. Pass nullptr to select the entire image; otherwise, subset must be contained by image bounds.
Image is returned if format of the encoded data is recognized and supported. Recognized formats vary by platform.
Parameters
encoded |
data of Image to decode |
subset |
bounds of returned Image; may be nullptr |
Return Value
created Image, or nullptr
Example
See Also
Typedef SkImage::TextureReleaseProc
typedef void (*TextureReleaseProc)(ReleaseContext releaseContext);
User function called when supplied texture may be deleted.
See Also
MakeFromTexture
static sk sp<SkImage> MakeFromTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin origin, SkColorType colorType, SkAlphaType alphaType, sk sp<SkColorSpace> colorSpace)
Creates Image from GPU Texture associated with context. Caller is responsible for managing the lifetime of GPU Texture.
Image is returned if format of backendTexture is recognized and supported. Recognized formats vary by GPU back-end.
Parameters
context |
GPU Context |
backendTexture |
texture residing on GPU |
origin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
colorType |
one of: kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType, kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType, kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType, kGray_8_SkColorType, kRGBA_F16_SkColorType |
alphaType |
one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType |
colorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
Example
See Also
MakeFromAdoptedTexture SkSurface::MakeFromBackendTexture
static sk sp<SkImage> MakeFromTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin origin, SkColorType colorType, SkAlphaType alphaType, sk sp<SkColorSpace> colorSpace, TextureReleaseProc textureReleaseProc, ReleaseContext releaseContext)
Creates Image from GPU Texture associated with context. GPU Texture must stay valid and unchanged until textureReleaseProc is called. textureReleaseProc is passed releaseContext when Image is deleted or no longer refers to texture.
Image is returned if format of backendTexture is recognized and supported. Recognized formats vary by GPU back-end.
Parameters
context |
GPU Context |
backendTexture |
texture residing on GPU |
origin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
colorType |
one of: kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType, kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType, kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType, kGray_8_SkColorType, kRGBA_F16_SkColorType |
alphaType |
one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType |
colorSpace |
range of colors; may be nullptr |
textureReleaseProc |
function called when texture can be released |
releaseContext |
state passed to textureReleaseProc |
Return Value
created Image, or nullptr
Example
See Also
MakeFromAdoptedTexture SkSurface::MakeFromBackendTexture
MakeCrossContextFromEncoded
static sk sp<SkImage> MakeCrossContextFromEncoded(GrContext* context, sk sp<SkData> data, bool buildMips, SkColorSpace* dstColorSpace, bool limitToMaxTextureSize = false)
Creates Image from encoded data. Image is uploaded to GPU back-end using context.
Created Image is available to other GPU contexts, and is available across thread boundaries. All contexts must be in the same GPU Share Group, or otherwise share resources.
When Image is no longer referenced, context releases texture memory asynchronously.
Texture decoded from data is uploaded to match Surface created with dstColorSpace. Color Space of Image is determined by encoded data.
Image is returned if format of data is recognized and supported, and if context supports moving resources. Recognized formats vary by platform and GPU back-end.
Image is returned using MakeFromEncoded if context is nullptr or does not support moving resources between contexts.
Parameters
context |
GPU Context |
data |
Image to decode |
buildMips |
create Image as Mip Map if true |
dstColorSpace |
range of colors of matching Surface on GPU |
limitToMaxTextureSize |
downscale image to GPU maximum texture size, if necessary |
Return Value
created Image, or nullptr
Example
See Also
MakeCrossContextFromPixmap
static sk sp<SkImage> MakeCrossContextFromPixmap(GrContext* context, const SkPixmap& pixmap, bool buildMips, SkColorSpace* dstColorSpace, bool limitToMaxTextureSize = false)
Creates Image from pixmap. Image is uploaded to GPU back-end using context.
Created Image is available to other GPU contexts, and is available across thread boundaries. All contexts must be in the same GPU Share Group, or otherwise share resources.
When Image is no longer referenced, context releases texture memory asynchronously.
Texture created from pixmap is uploaded to match Surface created with dstColorSpace. Color Space of Image is determined by pixmap.colorSpace().
Image is returned referring to GPU back-end if context is not nullptr, format of data is recognized and supported, and if context supports moving resources between contexts. Otherwise, pixmap pixel data is copied and Image as returned in raster format if possible; nullptr may be returned. Recognized GPU formats vary by platform and GPU back-end.
Parameters
context |
GPU Context |
pixmap |
Image Info, pixel address, and row bytes |
buildMips |
create Image as Mip Map if true |
dstColorSpace |
range of colors of matching Surface on GPU |
limitToMaxTextureSize |
downscale image to GPU maximum texture size, if necessary |
Return Value
created Image, or nullptr
Example
See Also
MakeFromAdoptedTexture
static sk sp<SkImage> MakeFromAdoptedTexture(GrContext* context, const GrBackendTexture& backendTexture, GrSurfaceOrigin surfaceOrigin, SkColorType colorType, SkAlphaType alphaType = kPremul_SkAlphaType, sk sp<SkColorSpace> colorSpace = nullptr)
Creates Image from backendTexture associated with context. backendTexture and returned Image are managed internally, and are released when no longer needed.
Image is returned if format of backendTexture is recognized and supported. Recognized formats vary by GPU back-end.
Parameters
context |
GPU Context |
backendTexture |
texture residing on GPU |
surfaceOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
colorType |
one of: kUnknown_SkColorType, kAlpha_8_SkColorType, kRGB_565_SkColorType, kARGB_4444_SkColorType, kRGBA_8888_SkColorType, kRGB_888x_SkColorType, kBGRA_8888_SkColorType, kRGBA_1010102_SkColorType, kRGB_101010x_SkColorType, kGray_8_SkColorType, kRGBA_F16_SkColorType |
alphaType |
one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType |
colorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
Example
See Also
MakeFromTexture[2] MakeFromYUVTexturesCopy
MakeFromYUVATexturesCopy
static sk sp<SkImage> MakeFromYUVATexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvaTextures[], const SkYUVAIndex yuvaIndices[4], SkISize imageSize, GrSurfaceOrigin imageOrigin, sk sp<SkColorSpace> imageColorSpace = nullptr)
Creates an SkImage by flattening the specified YUVA planes into a single, interleaved RGBA image. yuvaTextures points to array of up to four YUVA textures which reside on GPU. YUVA textures contain YUVA planes which may be interleaved.
Parameters
context |
GPU context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
yuvaTextures |
array of YUVA textures |
yuvaIndices |
array indicating yuvaTextures element and channel that map to Y, U, V, and A |
imageSize |
size of the resulting image |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
imageColorSpace |
range of colors of the resulting image; may be nullptr |
Return Value
created SkImage, or nullptr
See Also
MakeFromYUVATexturesCopyWithExternalBackend
MakeFromYUVATexturesCopyWithExternalBackend
static sk sp<SkImage> MakeFromYUVATexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvaTextures[], const SkYUVAIndex yuvaIndices[4], SkISize imageSize, GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk sp<SkColorSpace> imageColorSpace = nullptr)
Creates an SkImage by flattening the specified YUVA planes into a single, interleaved RGBA image. backendTexture is used to store the result of flattening. yuvaTextures points to array of up to four YUVA textures which reside on GPU. YUVA textures contain YUVA planes which may be interleaved.
Parameters
context |
GPU context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
yuvaTextures |
array of YUVA textures |
yuvaIndices |
array indicating yuvaTextures element and channel that map to Y, U, V, and A |
imageSize |
size of the resulting image |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
backendTexture |
resource that stores the final pixels |
imageColorSpace |
range of colors of the resulting image; may be nullptr |
Return Value
created SkImage, or nullptr
See Also
MakeFromYUVTexturesCopy
static sk sp<SkImage> MakeFromYUVTexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvTextures[3], GrSurfaceOrigin imageOrigin, sk sp<SkColorSpace> imageColorSpace = nullptr)
Creates Image from copy of yuvTextures, an array of textures on GPU. yuvTextures contain pixels for YUV planes of Image. Returned Image has the dimensions yuvTextures[0]. yuvColorSpace describes how YUV colors convert to RGB colors.
Parameters
context |
GPU Context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
yuvTextures |
array of YUV textures on GPU |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
imageColorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
See Also
MakeFromYUVTexturesCopyWithExternalBackend MakeFromNV12TexturesCopy MakeFromYUVATexturesCopy
MakeFromYUVTexturesCopyWithExternalBackend
static sk sp<SkImage> MakeFromYUVTexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvTextures[3], GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk sp<SkColorSpace> imageColorSpace = nullptr) ;
Creates Image from copy of yuvTextures, an array of textures on GPU. yuvTextures contain pixels for YUV planes of Image. Returned Image has the dimensions yuvTextures[0] and stores pixels in backendTexture. yuvColorSpace describes how YUV colors convert to RGB colors.
Parameters
context |
GPU Context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
yuvTextures |
array of YUV textures on GPU |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
backendTexture |
resource that stores final pixels |
imageColorSpace |
range of colors; may be nullptr |
Return Value
created SkImage, or nullptr
See Also
MakeFromYUVTexturesCopy MakeFromNV12TexturesCopy MakeFromYUVATexturesCopyWithExternalBackend
MakeFromNV12TexturesCopy
static sk sp<SkImage> MakeFromNV12TexturesCopy(GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture nv12Textures[2], GrSurfaceOrigin imageOrigin, sk sp<SkColorSpace> imageColorSpace = nullptr)
Creates Image from copy of nv12Textures, an array of textures on GPU. nv12Textures[0] contains pixels for YUV Component Y plane. nv12Textures[1] contains pixels for YUV Component U plane, followed by pixels for YUV Component V plane. Returned Image has the dimensions nv12Textures[2]. yuvColorSpace describes how YUV colors convert to RGB colors.
Parameters
context |
GPU Context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
nv12Textures |
array of YUV textures on GPU |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
imageColorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
See Also
MakeFromNV12TexturesCopyWithExternalBackend MakeFromYUVTexturesCopy MakeFromYUVATexturesCopy
MakeFromNV12TexturesCopyWithExternalBackend
static sk sp<SkImage> MakeFromNV12TexturesCopyWithExternalBackend( GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture nv12Textures[2], GrSurfaceOrigin imageOrigin, const GrBackendTexture& backendTexture, sk sp<SkColorSpace> imageColorSpace = nullptr) ;
Creates Image from copy of nv12Textures, an array of textures on GPU. nv12Textures[0] contains pixels for YUV Component Y plane. nv12Textures[1] contains pixels for YUV Component U plane, followed by pixels for YUV Component V plane. Returned Image has the dimensions nv12Textures[2] and stores pixels in backendTexture. yuvColorSpace describes how YUV colors convert to RGB colors.
Parameters
context |
GPU Context |
yuvColorSpace |
one of: kJPEG_SkYUVColorSpace, kRec601_SkYUVColorSpace, kRec709_SkYUVColorSpace |
nv12Textures |
array of YUV textures on GPU |
imageOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
backendTexture |
resource that stores final pixels |
imageColorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
See Also
MakeFromNV12TexturesCopy MakeFromYUVTexturesCopy MakeFromYUVATexturesCopyWithExternalBackend
Enum SkImage::BitDepth
enum class BitDepth { kU8, kF16, };
Constants
| Const | Value | Description |
|---|---|---|
SkImage::BitDepth::kU8 |
0 | Use 8 bits per ARGB component using unsigned integer format. |
SkImage::BitDepth::kF16 |
1 | Use 16 bits per ARGB component using half-precision floating point format. |
See Also
MakeFromPicture
static sk sp<SkImage> MakeFromPicture(sk sp<SkPicture> picture, const SkISize& dimensions, const SkMatrix* matrix, const SkPaint* paint, BitDepth bitDepth, sk sp<SkColorSpace> colorSpace)
Creates Image from picture. Returned Image width and height are set by dimensions. Image draws picture with matrix and paint, set to bitDepth and colorSpace.
If matrix is nullptr, draws with identity Matrix. If paint is nullptr, draws with default Paint. colorSpace may be nullptr.
Parameters
picture |
stream of drawing commands |
dimensions |
width and height |
matrix |
Matrix to rotate, scale, translate, and so on; may be nullptr |
paint |
Paint to apply transparency, filtering, and so on; may be nullptr |
bitDepth |
8-bit integer or 16-bit float: per component |
colorSpace |
range of colors; may be nullptr |
Return Value
created Image, or nullptr
Example
See Also
SkCanvas::drawPicture[2][3][4]
MakeFromAHardwareBuffer
static sk sp<SkImage> MakeFromAHardwareBuffer( AHardwareBuffer* hardwareBuffer, SkAlphaType alphaType = kPremul_SkAlphaType, sk sp<SkColorSpace> colorSpace = nullptr, GrSurfaceOrigin surfaceOrigin = kTopLeft GrSurfaceOrigin)
Creates Image from Android hardware buffer. Returned Image takes a reference on the buffer.
Only available on Android, when ANDROID_API is defined to be 26 or greater.
Parameters
hardwareBuffer |
AHardwareBuffer Android hardware buffer |
alphaType |
one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType |
colorSpace |
range of colors; may be nullptr |
surfaceOrigin |
one of: kBottomLeft GrSurfaceOrigin, kTopLeft GrSurfaceOrigin |
Return Value
created Image, or nullptr
See Also
Property
width
int width() const
Returns pixel count in each row.
Return Value
pixel width in Image
Example
See Also
dimensions() height()
height
int height() const
Returns pixel row count.
Return Value
pixel height in Image
Example
See Also
dimensions() width()
dimensions
SkISize dimensions() const
Returns ISize { width(), height() }.
Return Value
integral size of width() and height()
Example
Example Output
dimensionsAsBounds == bounds
See Also
bounds
SkIRect bounds() const
Returns IRect { 0, 0, width(), height() }.
Return Value
integral rectangle from origin to width() and height()
Example
See Also
uniqueID
uint32_t uniqueID() const
Returns value unique to image. Image contents cannot change after Image is created. Any operation to create a new Image will receive generate a new unique number.
Return Value
unique identifier
Example
See Also
alphaType
SkAlphaType alphaType() const
Returns Alpha Type, one of: kUnknown_SkAlphaType, kOpaque_SkAlphaType, kPremul_SkAlphaType, kUnpremul_SkAlphaType.
Alpha Type returned was a parameter to an Image constructor, or was parsed from encoded data.
Return Value
Alpha Type in Image
Example
See Also
colorType
SkColorType colorType() const
Returns Color Type if known; otherwise, returns kUnknown_SkColorType.
Return Value
Color Type of Image
Example
See Also
colorSpace
SkColorSpace* colorSpace() const
Returns Color Space, the range of colors, associated with Image. The reference count of Color Space is unchanged. The returned Color Space is immutable.
Color Space returned was passed to an Image constructor, or was parsed from encoded data. Color Space returned may be ignored when Image is drawn, depending on the capabilities of the Surface receiving the drawing.
Return Value
Color Space in Image, or nullptr
Example
See Also
refColorSpace
sk sp<SkColorSpace> refColorSpace() const
Returns a smart pointer to Color Space, the range of colors, associated with Image. The smart pointer tracks the number of objects sharing this SkColorSpace reference so the memory is released when the owners destruct.
The returned SkColorSpace is immutable.
Color Space returned was passed to an Image constructor, or was parsed from encoded data. Color Space returned may be ignored when Image is drawn, depending on the capabilities of the Surface receiving the drawing.
Return Value
Color Space in Image, or nullptr, wrapped in a smart pointer
Example
See Also
isAlphaOnly
bool isAlphaOnly() const
Returns true if Image pixels represent transparency only. If true, each pixel is packed in 8 bits as defined by kAlpha_8_SkColorType.
Return Value
true if pixels represent a transparency mask
Example
Example Output
alphaOnly = true
See Also
isOpaque
bool isOpaque() const
Returns true if pixels ignore their Alpha value and are treated as fully opaque.
Return Value
true if Alpha Type is kOpaque_SkAlphaType
Example
Example Output
isOpaque = false
isOpaque = true
See Also
makeShader
sk sp<SkShader> makeShader(SkShader::TileMode tileMode1, SkShader::TileMode tileMode2, const SkMatrix* localMatrix = nullptr) const
Creates Shader from Image. Shader dimensions are taken from Image. Shader uses SkShader::TileMode rules to fill drawn area outside Image. localMatrix permits transforming Image before Canvas Matrix is applied.
Parameters
tileMode1 |
tiling on x-axis, one of: SkShader::kClamp TileMode, SkShader::kRepeat TileMode, SkShader::kMirror TileMode |
tileMode2 |
tiling on y-axis, one of: SkShader::kClamp TileMode, SkShader::kRepeat TileMode, SkShader::kMirror TileMode |
localMatrix |
Image transformation, or nullptr |
Return Value
Example
See Also
sk sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const
Creates Shader from Image. Shader dimensions are taken from Image. Shader uses SkShader::kClamp TileMode to fill drawn area outside Image. localMatrix permits transforming Image before Canvas Matrix is applied.
Parameters
localMatrix |
Image transformation, or nullptr |
Return Value
Example
See Also
Pixels
peekPixels
bool peekPixels(SkPixmap* pixmap) const
Copies Image pixel address, row bytes, and Image Info to pixmap, if address is available, and returns true. If pixel address is not available, return false and leave pixmap unchanged.
Parameters
pixmap |
storage for pixel state if pixels are readable; otherwise, ignored |
Return Value
true if Image has direct access to pixels
Example
Example Output
------------
--xx----x---
-x--x--x----
-x--x--x----
-x--x-x-----
--xx-xx-xx--
-----x-x--x-
----x--x--x-
----x--x--x-
---x----xx--
------------
See Also
getTexture
GrTexture* getTexture() const
Deprecated.
isTextureBacked
bool isTextureBacked() const
Returns true the contents of Image was created on or uploaded to GPU memory, and is available as a GPU Texture.
Return Value
true if Image is a GPU Texture
Example
See Also
isValid
bool isValid(GrContext* context) const
Returns true if Image can be drawn on either Raster Surface or GPU Surface. If context is nullptr, tests if Image draws on Raster Surface; otherwise, tests if Image draws on GPU Surface associated with context.
Image backed by GPU Texture may become invalid if associated GrContext is invalid. Lazy Image may be invalid and may not draw to Raster Surface or GPU Surface or both.
Parameters
context |
GPU Context |
Return Value
true if Image can be drawn
Example
See Also
isTextureBacked isLazyGenerated
getBackendTexture
GrBackendTexture getBackendTexture(bool flushPendingGrContextIO, GrSurfaceOrigin* origin = nullptr) const
Retrieves the back-end texture. If Image has no back-end texture, an invalid object is returned. Call GrBackendTexture::isValid to determine if the result is valid.
If flushPendingGrContextIO is true, completes deferred I/O operations.
If origin in not nullptr, copies location of content drawn into Image.
Parameters
flushPendingGrContextIO |
flag to flush outstanding requests |
origin |
storage for one of: kTopLeft GrSurfaceOrigin, kBottomLeft GrSurfaceOrigin; or nullptr |
Return Value
back-end API texture handle; invalid on failure
Example
See Also
MakeFromTexture[2] isTextureBacked
Enum SkImage::CachingHint
enum CachingHint { kAllow_CachingHint, kDisallow_CachingHint, };
CachingHint selects whether Skia may internally cache Bitmaps generated by decoding Image, or by copying Image from GPU to CPU. The default behavior allows caching Bitmaps.
Choose kDisallow CachingHint if Image pixels are to be used only once, or if Image pixels reside in a cache outside of Skia, or to reduce memory pressure.
Choosing kAllow CachingHint does not ensure that pixels will be cached. Image pixels may not be cached if memory requirements are too large or pixels are not accessible.
Constants
| Const | Value | Description |
|---|---|---|
SkImage::kAllow_CachingHint |
0 | allows internally caching decoded and copied pixels |
SkImage::kDisallow_CachingHint |
1 | disallows internally caching decoded and copied pixels |
See Also
readPixels
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, int srcX, int srcY, CachingHint cachingHint = kAllow CachingHint) const
Copies Rect of pixels from Image to dstPixels. Copy starts at offset (srcX, srcY), and does not exceed Image (width(), height()).
dstInfo specifies width, height, Color Type, Alpha Type, and Color Space of destination. dstRowBytes specifics the gap from one destination row to the next. Returns true if pixels are copied. Returns false if:
| dstInfo.addr() equals nullptr |
| dstRowBytes is less than dstInfo.minRowBytes |
| Pixel Ref is nullptr |
Pixels are copied only if pixel conversion is possible. If Image Color Type is kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType must match. If Image Color Type is kGray_8_SkColorType, dstInfo.colorSpace must match. If Image Alpha Type is kOpaque_SkAlphaType, dstInfo.alphaType must match. If Image Color Space is nullptr, dstInfo.colorSpace must match. Returns false if pixel conversion is not possible.
srcX and srcY may be negative to copy only top or left of source. Returns
false if width() or height() is zero or negative.
Returns false if abs(srcX) >= Image width(), or if abs(srcY) >= Image height().
If cachingHint is kAllow CachingHint, pixels may be retained locally. If cachingHint is kDisallow CachingHint, pixels are not added to the local cache.
Parameters
dstInfo |
destination width, height, Color Type, Alpha Type, Color Space |
dstPixels |
destination pixel storage |
dstRowBytes |
destination row length |
srcX |
column index whose absolute value is less than width() |
srcY |
row index whose absolute value is less than height() |
cachingHint |
one of: kAllow CachingHint, kDisallow CachingHint |
Return Value
true if pixels are copied to dstPixels
Example
See Also
scalePixels SkBitmap::readPixels[2][3] SkPixmap::readPixels[2][3][4] SkCanvas::readPixels[2][3] SkSurface::readPixels[2][3]
bool readPixels(const SkPixmap& dst, int srcX, int srcY, CachingHint cachingHint = kAllow CachingHint) const
Copies a Rect of pixels from Image to dst. Copy starts at (srcX, srcY), and does not exceed Image (width(), height()).
dst specifies width, height, Color Type, Alpha Type, Color Space, pixel storage, and row bytes of destination. dst.rowBytes specifics the gap from one destination row to the next. Returns true if pixels are copied. Returns false if:
| dst pixel storage equals nullptr |
| dst.rowBytes is less than SkImageInfo::minRowBytes |
| Pixel Ref is nullptr |
Pixels are copied only if pixel conversion is possible. If Image Color Type is kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.colorType must match. If Image Color Type is kGray_8_SkColorType, dst.colorSpace must match. If Image Alpha Type is kOpaque_SkAlphaType, dst.alphaType must match. If Image Color Space is nullptr, dst.colorSpace must match. Returns false if pixel conversion is not possible.
srcX and srcY may be negative to copy only top or left of source. Returns
false if width() or height() is zero or negative.
Returns false if abs(srcX) >= Image width(), or if abs(srcY) >= Image height().
If cachingHint is kAllow CachingHint, pixels may be retained locally. If cachingHint is kDisallow CachingHint, pixels are not added to the local cache.
Parameters
dst |
destination Pixmap: Image Info, pixels, row bytes |
srcX |
column index whose absolute value is less than width() |
srcY |
row index whose absolute value is less than height() |
cachingHint |
one of: kAllow CachingHint, kDisallow CachingHint |
Return Value
true if pixels are copied to dst
Example
See Also
scalePixels SkBitmap::readPixels[2][3] SkPixmap::readPixels[2][3][4] SkCanvas::readPixels[2][3] SkSurface::readPixels[2][3]
scalePixels
bool scalePixels(const SkPixmap& dst, SkFilterQuality filterQuality, CachingHint cachingHint = kAllow CachingHint) const
Copies Image to dst, scaling pixels to fit dst.width() and dst.height(), and converting pixels to match dst.colorType and dst.alphaType. Returns true if pixels are copied. Returns false if dst.addr() is nullptr, or dst.rowBytes is less than dst SkImageInfo::minRowBytes.
Pixels are copied only if pixel conversion is possible. If Image Color Type is kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.colorType must match. If Image Color Type is kGray_8_SkColorType, dst.colorSpace must match. If Image Alpha Type is kOpaque_SkAlphaType, dst.alphaType must match. If Image Color Space is nullptr, dst.colorSpace must match. Returns false if pixel conversion is not possible.
Scales the image, with filterQuality, to match dst.width() and dst.height(). filterQuality kNone_SkFilterQuality is fastest, typically implemented with Filter Quality Nearest Neighbor. kLow_SkFilterQuality is typically implemented with Filter Quality Bilerp. kMedium_SkFilterQuality is typically implemented with Filter Quality Bilerp, and Filter Quality MipMap when size is reduced. kHigh_SkFilterQuality is slowest, typically implemented with Filter Quality BiCubic.
If cachingHint is kAllow CachingHint, pixels may be retained locally. If cachingHint is kDisallow CachingHint, pixels are not added to the local cache.
Parameters
dst |
destination Pixmap: Image Info, pixels, row bytes |
filterQuality |
one of: kNone_SkFilterQuality, kLow_SkFilterQuality, kMedium_SkFilterQuality, kHigh_SkFilterQuality |
cachingHint |
one of: kAllow CachingHint, kDisallow CachingHint |
Return Value
true if pixels are scaled to fit dst
Example
See Also
SkCanvas::drawImage[2] readPixels[2] SkPixmap::scalePixels
encodeToData
sk sp<SkData> encodeToData(SkEncodedImageFormat encodedImageFormat, int quality) const
Encodes Image pixels, returning result as SkData.
Returns nullptr if encoding fails, or if encodedImageFormat is not supported.
Image encoding in a format requires both building with one or more of: SK_HAS_JPEG_LIBRARY, SK_HAS_PNG_LIBRARY, SK_HAS_WEBP_LIBRARY; and platform support for the encoded format.
If SK_BUILD_FOR_MAC or SK_BUILD_FOR_IOS is defined, encodedImageFormat can additionally be one of: SkEncodedImageFormat::kICO, SkEncodedImageFormat::kBMP, SkEncodedImageFormat::kGIF.
quality is a platform and format specific metric trading off size and encoding error. When used, quality equaling 100 encodes with the least error. quality may be ignored by the encoder.
Parameters
encodedImageFormat |
one of: SkEncodedImageFormat::kJPEG, SkEncodedImageFormat::kPNG, SkEncodedImageFormat::kWEBP |
quality |
encoder specific metric with 100 equaling best |
Return Value
encoded Image, or nullptr
Example
See Also
refEncodedData MakeFromEncoded
sk sp<SkData> encodeToData() const
Encodes Image pixels, returning result as SkData. Returns existing encoded data if present; otherwise, Image is encoded with SkEncodedImageFormat::kPNG. Skia must be built with SK_HAS_PNG_LIBRARY to encode Image.
Returns nullptr if existing encoded data is missing or invalid, and encoding fails.
Return Value
encoded Image, or nullptr
Example
See Also
refEncodedData MakeFromEncoded
refEncodedData
sk sp<SkData> refEncodedData() const
Returns encoded Image pixels as SkData, if Image was created from supported encoded stream format. Platform support for formats vary and may require building with one or more of: SK_HAS_JPEG_LIBRARY, SK_HAS_PNG_LIBRARY, SK_HAS_WEBP_LIBRARY.
Returns nullptr if Image contents are not encoded.
Return Value
encoded Image, or nullptr
Example
See Also
encodeToData[2] MakeFromEncoded
Utility
makeSubset
sk sp<SkImage> makeSubset(const SkIRect& subset) const
Returns subset of Image. subset must be fully contained by Image dimensions(). The implementation may share pixels, or may copy them.
Returns nullptr if subset is empty, or subset is not contained by bounds, or pixels in Image could not be read or copied.
Parameters
subset |
bounds of returned Image |
Return Value
partial or full Image, or nullptr
Example
See Also
makeTextureImage
sk sp<SkImage> makeTextureImage(GrContext* context, SkColorSpace* dstColorSpace, GrMipMapped mipMapped = GrMipMapped::kNo) const
Returns Image backed by GPU Texture associated with context. Returned Image is compatible with Surface created with dstColorSpace. The returned Image respects mipMapped setting; if mipMapped equals GrMipMapped::kYes, the backing texture allocates Mip Map levels. Returns original Image if context and dstColorSpace match and mipMapped is compatible with backing GPU Texture.
Returns nullptr if context is nullptr, or if Image was created with another GrContext.
Parameters
context |
GPU Context |
dstColorSpace |
range of colors of matching Surface on GPU |
mipMapped |
whether created Image texture must allocate Mip Map levels |
Return Value
created Image, or nullptr
Example
See Also
makeNonTextureImage
sk sp<SkImage> makeNonTextureImage() const
Returns Raster Image or Lazy Image. Copies Image backed by GPU Texture into CPU memory if needed. Returns original Image if decoded in Raster Bitmap, or if encoded in a stream.
Returns nullptr if backed by GPU Texture and copy fails.
Return Value
Raster Image, Lazy Image, or nullptr
Example
See Also
makeTextureImage makeRasterImage MakeBackendTextureFromSkImage
makeRasterImage
sk sp<SkImage> makeRasterImage() const
Returns Raster Image. Copies Image backed by GPU Texture into CPU memory, or decodes Image from Lazy Image. Returns original Image if decoded in Raster Bitmap.
Returns nullptr if copy, decode, or pixel read fails.
Return Value
Raster Image, or nullptr
Example
See Also
isTextureBacked isLazyGenerated MakeFromRaster
makeWithFilter
sk sp<SkImage> makeWithFilter(const SkImageFilter* filter, const SkIRect& subset, const SkIRect& clipBounds, SkIRect* outSubset, SkIPoint* offset) const
Creates filtered Image. filter processes original Image, potentially changing color, position, and size. subset is the bounds of original Image processed by filter. clipBounds is the expected bounds of the filtered Image. outSubset is required storage for the actual bounds of the filtered Image. offset is required storage for translation of returned Image.
Returns nullptr if Image could not be created. If nullptr is returned, outSubset and offset are undefined.
Useful for animation of SkImageFilter that varies size from frame to frame. Returned Image is created larger than required by filter so that GPU Texture can be reused with different sized effects. outSubset describes the valid bounds of GPU Texture returned. offset translates the returned Image to keep subsequent animation frames aligned with respect to each other.
Parameters
filter |
how Image is sampled when transformed |
subset |
bounds of Image processed by filter |
clipBounds |
expected bounds of filtered Image |
outSubset |
storage for returned Image bounds |
offset |
storage for returned Image translation |
Return Value
filtered Image, or nullptr
Example
See Also
makeShader[2] SkPaint::setImageFilter
Typedef SkImage::BackendTextureReleaseProc
typedef std::function BackendTextureReleaseProc;
Defines a callback function, taking one parameter of type GrBackendTexture with no return value. Function is called when back-end texture is to be released.
MakeBackendTextureFromSkImage
static bool MakeBackendTextureFromSkImage(GrContext* context, sk sp<SkImage> image, GrBackendTexture* backendTexture, BackendTextureReleaseProc* backendTextureReleaseProc)
Creates a GrBackendTexture from the provided SkImage. Returns true and stores result in backendTexture and backendTextureReleaseProc if texture is created; otherwise, returns false and leaves backendTexture and backendTextureReleaseProc unmodified.
Call backendTextureReleaseProc after deleting backendTexture. backendTextureReleaseProc cleans up auxiliary data related to returned backendTexture. The caller must delete returned backendTexture after use.
If Image is both texture backed and singly referenced, image is returned in backendTexture without conversion or making a copy. Image is singly referenced if its was transferred solely using std::move().
If Image is not texture backed, returns texture with Image contents.
Parameters
context |
GPU Context |
image |
Image used for texture |
backendTexture |
storage for back-end texture |
backendTextureReleaseProc |
storage for clean up function |
Return Value
true if back-end texture was created
Example
See Also
MakeFromTexture[2] makeTextureImage
Enum SkImage::LegacyBitmapMode
To be deprecated soon.
enum LegacyBitmapMode { kRO_LegacyBitmapMode, };
Constants
| Const | Value | Description |
|---|---|---|
SkImage::kRO_LegacyBitmapMode |
0 | returned bitmap is read-only and immutable |
asLegacyBitmap
bool asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode legacyBitmapMode = kRO LegacyBitmapMode) const
Creates raster Bitmap with same pixels as Image. If legacyBitmapMode is kRO LegacyBitmapMode, returned bitmap is read-only and immutable. Returns true if Bitmap is stored in bitmap. Returns false and resets bitmap if Bitmap write did not succeed.
Parameters
bitmap |
storage for legacy Bitmap |
legacyBitmapMode |
to be deprecated |
Return Value
true if Bitmap was created
Example
See Also
MakeRasterData makeRasterImage makeNonTextureImage
isLazyGenerated
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.
Return Value
true if Image is created as needed
Example
Example
See Also
isTextureBacked MakeNonTextureImage
makeColorSpace
sk sp<SkImage> makeColorSpace(sk sp<SkColorSpace> target) const
Creates Image in target Color Space. Returns nullptr if Image could not be created.
Returns original Image if it is in target Color Space. Otherwise, converts pixels from Image Color Space to target Color Space. If Image colorSpace returns nullptr, Image Color Space is assumed to be sRGB.
Parameters
target |
Color Space describing color range of returned Image |
Return Value
created Image in target Color Space
Example
See Also
MakeFromPixture MakeFromTexture[2]