| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkImage_DEFINED |
| #define SkImage_DEFINED |
| |
| #include "include/core/SkAlphaType.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkSize.h" |
| #include "include/private/base/SkAPI.h" |
| |
| #include <cstddef> |
| #include <cstdint> |
| #include <memory> |
| #include <optional> |
| |
| class GrDirectContext; |
| class GrRecordingContext; |
| class SkBitmap; |
| class SkColorSpace; |
| class SkData; |
| class SkImage; |
| class SkImageFilter; |
| class SkImageGenerator; |
| class SkMatrix; |
| class SkMipmap; |
| class SkPaint; |
| class SkPicture; |
| class SkPixmap; |
| class SkShader; |
| class SkSurfaceProps; |
| enum SkColorType : int; |
| enum class SkTextureCompressionType; |
| enum class SkTileMode; |
| |
| struct SkIPoint; |
| struct SkSamplingOptions; |
| |
| namespace skgpu::graphite { class Recorder; } |
| |
| namespace SkImages { |
| |
| /** Caller data passed to RasterReleaseProc; may be nullptr. */ |
| using ReleaseContext = void*; |
| /** Function called when SkImage no longer shares pixels. ReleaseContext is |
| provided by caller when SkImage is created, and may be nullptr. |
| */ |
| using RasterReleaseProc = void(const void* pixels, ReleaseContext); |
| |
| /** Creates a CPU-backed SkImage 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. |
| |
| SkImage is returned if bitmap is valid. Valid SkBitmap parameters include: |
| dimensions are greater than zero; |
| each dimension fits in 29 bits; |
| SkColorType and SkAlphaType are valid, and SkColorType is not kUnknown_SkColorType; |
| row bytes are large enough to hold one row of pixels; |
| pixel address is not nullptr. |
| |
| @param bitmap SkImageInfo, row bytes, and pixels |
| @return created SkImage, or nullptr |
| */ |
| SK_API sk_sp<SkImage> RasterFromBitmap(const SkBitmap& bitmap); |
| |
| /** Creates a CPU-backed SkImage from compressed data. |
| |
| This method will decompress the compressed data and create an image wrapping |
| it. Any mipmap levels present in the compressed data are discarded. |
| |
| @param data compressed data to store in SkImage |
| @param width width of full SkImage |
| @param height height of full SkImage |
| @param type type of compression used |
| @return created SkImage, or nullptr |
| */ |
| SK_API sk_sp<SkImage> RasterFromCompressedTextureData(sk_sp<SkData> data, |
| int width, |
| int height, |
| SkTextureCompressionType type); |
| |
| /** |
| * Return a SkImage using the encoded data, but attempts to defer decoding until the |
| * image is actually used/drawn. This deferral allows the system to cache the result, either on the |
| * CPU or on the GPU, depending on where the image is drawn. If memory is low, the cache may |
| * be purged, causing the next draw of the image to have to re-decode. |
| * |
| * If alphaType is nullopt, the image's alpha type will be chosen automatically based on the |
| * image format. Transparent images will default to kPremul_SkAlphaType. If alphaType contains |
| * kPremul_SkAlphaType or kUnpremul_SkAlphaType, that alpha type will be used. Forcing opaque |
| * (passing kOpaque_SkAlphaType) is not allowed, and will return nullptr. |
| * |
| * If the encoded format is not supported, nullptr is returned. |
| * |
| * @param encoded the encoded data |
| * @return created SkImage, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_DeferredFromEncodedData |
| */ |
| SK_API sk_sp<SkImage> DeferredFromEncodedData(sk_sp<SkData> encoded, |
| std::optional<SkAlphaType> alphaType = std::nullopt); |
| |
| /** Creates SkImage from data returned by imageGenerator. The image data will not be created |
| (on either the CPU or GPU) until the image is actually drawn. |
| Generated data is owned by SkImage and may not be shared or accessed. |
| |
| SkImage is returned if generator data is valid. Valid data parameters vary by type of data |
| and platform. |
| |
| imageGenerator may wrap SkPicture data, codec data, or custom data. |
| |
| @param imageGenerator stock or custom routines to retrieve SkImage |
| @return created SkImage, or nullptr |
| */ |
| SK_API sk_sp<SkImage> DeferredFromGenerator(std::unique_ptr<SkImageGenerator> imageGenerator); |
| |
| enum class BitDepth { |
| kU8, //!< uses 8-bit unsigned int per color component |
| kF16, //!< uses 16-bit float per color component |
| }; |
| |
| /** Creates SkImage from picture. Returned SkImage width and height are set by dimensions. |
| SkImage draws picture with matrix and paint, set to bitDepth and colorSpace. |
| |
| The Picture data is not turned into an image (CPU or GPU) until it is drawn. |
| |
| If matrix is nullptr, draws with identity SkMatrix. If paint is nullptr, draws |
| with default SkPaint. colorSpace may be nullptr. |
| |
| @param picture stream of drawing commands |
| @param dimensions width and height |
| @param matrix SkMatrix to rotate, scale, translate, and so on; may be nullptr |
| @param paint SkPaint to apply transparency, filtering, and so on; may be nullptr |
| @param bitDepth 8-bit integer or 16-bit float: per component |
| @param colorSpace range of colors; may be nullptr |
| @param props props to use when rasterizing the picture |
| @return created SkImage, or nullptr |
| */ |
| SK_API sk_sp<SkImage> DeferredFromPicture(sk_sp<SkPicture> picture, |
| const SkISize& dimensions, |
| const SkMatrix* matrix, |
| const SkPaint* paint, |
| BitDepth bitDepth, |
| sk_sp<SkColorSpace> colorSpace, |
| SkSurfaceProps props); |
| SK_API sk_sp<SkImage> DeferredFromPicture(sk_sp<SkPicture> picture, |
| const SkISize& dimensions, |
| const SkMatrix* matrix, |
| const SkPaint* paint, |
| BitDepth bitDepth, |
| sk_sp<SkColorSpace> colorSpace); |
| |
| /** Creates a CPU-backed SkImage from pixmap, copying the pixel data. |
| As a result, pixmap pixels may be modified or deleted without affecting SkImage. |
| |
| SkImage is returned if SkPixmap is valid. Valid SkPixmap parameters include: |
| dimensions are greater than zero; |
| each dimension fits in 29 bits; |
| SkColorType and SkAlphaType are valid, and SkColorType is not kUnknown_SkColorType; |
| row bytes are large enough to hold one row of pixels; |
| pixel address is not nullptr. |
| |
| @param pixmap SkImageInfo, pixel address, and row bytes |
| @return copy of SkPixmap pixels, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_RasterFromPixmapCopy |
| */ |
| SK_API sk_sp<SkImage> RasterFromPixmapCopy(const SkPixmap& pixmap); |
| |
| /** Creates CPU-backed SkImage from pixmap, sharing SkPixmap pixels. Pixels must remain valid and |
| unchanged until rasterReleaseProc is called. rasterReleaseProc is passed |
| releaseContext when SkImage is deleted or no longer refers to pixmap pixels. |
| |
| Pass nullptr for rasterReleaseProc to share SkPixmap without requiring a callback |
| when SkImage is released. Pass nullptr for releaseContext if rasterReleaseProc |
| does not require state. |
| |
| SkImage is returned if pixmap is valid. Valid SkPixmap parameters include: |
| dimensions are greater than zero; |
| each dimension fits in 29 bits; |
| SkColorType and SkAlphaType are valid, and SkColorType is not kUnknown_SkColorType; |
| row bytes are large enough to hold one row of pixels; |
| pixel address is not nullptr. |
| |
| @param pixmap SkImageInfo, pixel address, and row bytes |
| @param rasterReleaseProc function called when pixels can be released; or nullptr |
| @param releaseContext state passed to rasterReleaseProc; or nullptr |
| @return SkImage sharing pixmap |
| */ |
| SK_API sk_sp<SkImage> RasterFromPixmap(const SkPixmap& pixmap, |
| RasterReleaseProc rasterReleaseProc, |
| ReleaseContext releaseContext); |
| |
| /** Creates CPU-backed SkImage from pixel data described by info. |
| The pixels data will *not* be copied. |
| |
| SkImage is returned if SkImageInfo is valid. Valid SkImageInfo parameters include: |
| dimensions are greater than zero; |
| each dimension fits in 29 bits; |
| SkColorType and SkAlphaType are valid, and SkColorType is not kUnknown_SkColorType; |
| rowBytes are large enough to hold one row of pixels; |
| pixels is not nullptr, and contains enough data for SkImage. |
| |
| @param info contains width, height, SkAlphaType, SkColorType, SkColorSpace |
| @param pixels address or pixel storage |
| @param rowBytes size of pixel row or larger |
| @return SkImage sharing pixels, or nullptr |
| */ |
| SK_API sk_sp<SkImage> RasterFromData(const SkImageInfo& info, |
| sk_sp<SkData> pixels, |
| size_t rowBytes); |
| |
| /** Creates a filtered SkImage on the CPU. filter processes the src image, potentially changing |
| the color, position, and size. subset is the bounds of src that are processed |
| by filter. clipBounds is the expected bounds of the filtered SkImage. outSubset |
| is required storage for the actual bounds of the filtered SkImage. offset is |
| required storage for translation of returned SkImage. |
| |
| Returns nullptr a filtered result 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. |
| outSubset describes the valid bounds of returned image. offset translates the returned SkImage |
| to keep subsequent animation frames aligned with respect to each other. |
| |
| @param src the image to be filtered |
| @param filter the image filter to be applied |
| @param subset bounds of SkImage processed by filter |
| @param clipBounds expected bounds of filtered SkImage |
| @param outSubset storage for returned SkImage bounds |
| @param offset storage for returned SkImage translation |
| @return filtered SkImage, or nullptr |
| */ |
| SK_API sk_sp<SkImage> MakeWithFilter(sk_sp<SkImage> src, |
| const SkImageFilter* filter, |
| const SkIRect& subset, |
| const SkIRect& clipBounds, |
| SkIRect* outSubset, |
| SkIPoint* offset); |
| |
| } // namespace SkImages |
| |
| /** \class SkImage |
| SkImage describes a two dimensional array of pixels to draw. The pixels may be |
| decoded in a raster bitmap, encoded in a SkPicture or compressed data stream, |
| or located in GPU memory as a GPU texture. |
| |
| SkImage cannot be modified after it is created. SkImage may allocate additional |
| storage as needed; for instance, an encoded SkImage may decode when drawn. |
| |
| SkImage width and height are greater than zero. Creating an SkImage with zero width |
| or height returns SkImage equal to nullptr. |
| |
| SkImage may be created from SkBitmap, SkPixmap, SkSurface, SkPicture, 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. |
| |
| See SkImages namespace for the static factory methods to make SkImages. |
| |
| Clients should *not* subclass SkImage as there is a lot of internal machinery that is |
| not publicly accessible. |
| */ |
| class SK_API SkImage : public SkRefCnt { |
| public: |
| /** Returns a SkImageInfo describing the width, height, color type, alpha type, and color space |
| of the SkImage. |
| |
| @return image info of SkImage. |
| */ |
| const SkImageInfo& imageInfo() const { return fInfo; } |
| |
| /** Returns pixel count in each row. |
| |
| @return pixel width in SkImage |
| */ |
| int width() const { return fInfo.width(); } |
| |
| /** Returns pixel row count. |
| |
| @return pixel height in SkImage |
| */ |
| int height() const { return fInfo.height(); } |
| |
| /** Returns SkISize { width(), height() }. |
| |
| @return integral size of width() and height() |
| */ |
| SkISize dimensions() const { return SkISize::Make(fInfo.width(), fInfo.height()); } |
| |
| /** Returns SkIRect { 0, 0, width(), height() }. |
| |
| @return integral rectangle from origin to width() and height() |
| */ |
| SkIRect bounds() const { return SkIRect::MakeWH(fInfo.width(), fInfo.height()); } |
| |
| /** Returns value unique to image. SkImage contents cannot change after SkImage is |
| created. Any operation to create a new SkImage will receive generate a new |
| unique number. |
| |
| @return unique identifier |
| */ |
| uint32_t uniqueID() const { return fUniqueID; } |
| |
| /** Returns SkAlphaType. |
| |
| SkAlphaType returned was a parameter to an SkImage constructor, |
| or was parsed from encoded data. |
| |
| @return SkAlphaType in SkImage |
| |
| example: https://fiddle.skia.org/c/@Image_alphaType |
| */ |
| SkAlphaType alphaType() const; |
| |
| /** Returns SkColorType if known; otherwise, returns kUnknown_SkColorType. |
| |
| @return SkColorType of SkImage |
| |
| example: https://fiddle.skia.org/c/@Image_colorType |
| */ |
| SkColorType colorType() const; |
| |
| /** Returns SkColorSpace, the range of colors, associated with SkImage. The |
| reference count of SkColorSpace is unchanged. The returned SkColorSpace is |
| immutable. |
| |
| SkColorSpace returned was passed to an SkImage constructor, |
| or was parsed from encoded data. SkColorSpace returned may be ignored when SkImage |
| is drawn, depending on the capabilities of the SkSurface receiving the drawing. |
| |
| @return SkColorSpace in SkImage, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_colorSpace |
| */ |
| SkColorSpace* colorSpace() const; |
| |
| /** Returns a smart pointer to SkColorSpace, the range of colors, associated with |
| SkImage. 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. |
| |
| SkColorSpace returned was passed to an SkImage constructor, |
| or was parsed from encoded data. SkColorSpace returned may be ignored when SkImage |
| is drawn, depending on the capabilities of the SkSurface receiving the drawing. |
| |
| @return SkColorSpace in SkImage, or nullptr, wrapped in a smart pointer |
| |
| example: https://fiddle.skia.org/c/@Image_refColorSpace |
| */ |
| sk_sp<SkColorSpace> refColorSpace() const; |
| |
| /** Returns true if SkImage pixels represent transparency only. If true, each pixel |
| is packed in 8 bits as defined by kAlpha_8_SkColorType. |
| |
| @return true if pixels represent a transparency mask |
| |
| example: https://fiddle.skia.org/c/@Image_isAlphaOnly |
| */ |
| bool isAlphaOnly() const; |
| |
| /** Returns true if pixels ignore their alpha value and are treated as fully opaque. |
| |
| @return true if SkAlphaType is kOpaque_SkAlphaType |
| */ |
| bool isOpaque() const { return SkAlphaTypeIsOpaque(this->alphaType()); } |
| |
| /** |
| * Make a shader with the specified tiling and mipmap sampling. |
| */ |
| sk_sp<SkShader> makeShader(SkTileMode tmx, SkTileMode tmy, const SkSamplingOptions&, |
| const SkMatrix* localMatrix = nullptr) const; |
| sk_sp<SkShader> makeShader(SkTileMode tmx, SkTileMode tmy, const SkSamplingOptions& sampling, |
| const SkMatrix& lm) const; |
| /** Defaults to clamp in both X and Y. */ |
| sk_sp<SkShader> makeShader(const SkSamplingOptions& sampling, const SkMatrix& lm) const; |
| sk_sp<SkShader> makeShader(const SkSamplingOptions& sampling, |
| const SkMatrix* lm = nullptr) const; |
| |
| /** |
| * makeRawShader functions like makeShader, but for images that contain non-color data. |
| * This includes images encoding things like normals, material properties (eg, roughness), |
| * heightmaps, or any other purely mathematical data that happens to be stored in an image. |
| * These types of images are useful with some programmable shaders (see: SkRuntimeEffect). |
| * |
| * Raw image shaders work like regular image shaders (including filtering and tiling), with |
| * a few major differences: |
| * - No color space transformation is ever applied (the color space of the image is ignored). |
| * - Images with an alpha type of kUnpremul are *not* automatically premultiplied. |
| * - Bicubic filtering is not supported. If SkSamplingOptions::useCubic is true, these |
| * factories will return nullptr. |
| */ |
| sk_sp<SkShader> makeRawShader(SkTileMode tmx, SkTileMode tmy, const SkSamplingOptions&, |
| const SkMatrix* localMatrix = nullptr) const; |
| sk_sp<SkShader> makeRawShader(SkTileMode tmx, SkTileMode tmy, const SkSamplingOptions& sampling, |
| const SkMatrix& lm) const; |
| /** Defaults to clamp in both X and Y. */ |
| sk_sp<SkShader> makeRawShader(const SkSamplingOptions& sampling, const SkMatrix& lm) const; |
| sk_sp<SkShader> makeRawShader(const SkSamplingOptions& sampling, |
| const SkMatrix* lm = nullptr) const; |
| |
| /** Copies SkImage pixel address, row bytes, and SkImageInfo to pixmap, if address |
| is available, and returns true. If pixel address is not available, return |
| false and leave pixmap unchanged. |
| |
| @param pixmap storage for pixel state if pixels are readable; otherwise, ignored |
| @return true if SkImage has direct access to pixels |
| |
| example: https://fiddle.skia.org/c/@Image_peekPixels |
| */ |
| bool peekPixels(SkPixmap* pixmap) const; |
| |
| /** Returns true if the contents of SkImage was created on or uploaded to GPU memory, |
| and is available as a GPU texture. |
| |
| @return true if SkImage is a GPU texture |
| |
| example: https://fiddle.skia.org/c/@Image_isTextureBacked |
| */ |
| virtual bool isTextureBacked() const = 0; |
| |
| /** Returns an approximation of the amount of texture memory used by the image. Returns |
| zero if the image is not texture backed or if the texture has an external format. |
| */ |
| virtual size_t textureSize() const = 0; |
| |
| /** Returns true if SkImage can be drawn on either raster surface or GPU surface. |
| If context is nullptr, tests if SkImage draws on raster surface; |
| otherwise, tests if SkImage draws on GPU surface associated with context. |
| |
| SkImage backed by GPU texture may become invalid if associated context is |
| invalid. lazy image may be invalid and may not draw to raster surface or |
| GPU surface or both. |
| |
| @param context GPU context |
| @return true if SkImage can be drawn |
| |
| example: https://fiddle.skia.org/c/@Image_isValid |
| */ |
| virtual bool isValid(GrRecordingContext* context) const = 0; |
| |
| /** \enum SkImage::CachingHint |
| CachingHint selects whether Skia may internally cache SkBitmap generated by |
| decoding SkImage, or by copying SkImage from GPU to CPU. The default behavior |
| allows caching SkBitmap. |
| |
| Choose kDisallow_CachingHint if SkImage pixels are to be used only once, or |
| if SkImage pixels reside in a cache outside of Skia, or to reduce memory pressure. |
| |
| Choosing kAllow_CachingHint does not ensure that pixels will be cached. |
| SkImage pixels may not be cached if memory requirements are too large or |
| pixels are not accessible. |
| */ |
| enum CachingHint { |
| kAllow_CachingHint, //!< allows internally caching decoded and copied pixels |
| kDisallow_CachingHint, //!< disallows internally caching decoded and copied pixels |
| }; |
| |
| /** Copies SkRect of pixels from SkImage to dstPixels. Copy starts at offset (srcX, srcY), |
| and does not exceed SkImage (width(), height()). |
| |
| dstInfo specifies width, height, SkColorType, SkAlphaType, and SkColorSpace of |
| destination. dstRowBytes specifies 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() |
| - SkPixelRef is nullptr |
| |
| Pixels are copied only if pixel conversion is possible. If SkImage SkColorType is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dstInfo.colorType() must match. |
| If SkImage SkColorType is kGray_8_SkColorType, dstInfo.colorSpace() must match. |
| If SkImage SkAlphaType is kOpaque_SkAlphaType, dstInfo.alphaType() must |
| match. If SkImage SkColorSpace 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. |
| |
| @param context the GrDirectContext in play, if it exists |
| @param dstInfo destination width, height, SkColorType, SkAlphaType, SkColorSpace |
| @param dstPixels destination pixel storage |
| @param dstRowBytes destination row length |
| @param srcX column index whose absolute value is less than width() |
| @param srcY row index whose absolute value is less than height() |
| @param cachingHint whether the pixels should be cached locally |
| @return true if pixels are copied to dstPixels |
| */ |
| bool readPixels(GrDirectContext* context, |
| const SkImageInfo& dstInfo, |
| void* dstPixels, |
| size_t dstRowBytes, |
| int srcX, int srcY, |
| CachingHint cachingHint = kAllow_CachingHint) const; |
| |
| /** Copies a SkRect of pixels from SkImage to dst. Copy starts at (srcX, srcY), and |
| does not exceed SkImage (width(), height()). |
| |
| dst specifies width, height, SkColorType, SkAlphaType, SkColorSpace, 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 |
| - SkPixelRef is nullptr |
| |
| Pixels are copied only if pixel conversion is possible. If SkImage SkColorType is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.colorType() must match. |
| If SkImage SkColorType is kGray_8_SkColorType, dst.colorSpace() must match. |
| If SkImage SkAlphaType is kOpaque_SkAlphaType, dst.alphaType() must |
| match. If SkImage SkColorSpace 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. |
| |
| @param context the GrDirectContext in play, if it exists |
| @param dst destination SkPixmap: SkImageInfo, pixels, row bytes |
| @param srcX column index whose absolute value is less than width() |
| @param srcY row index whose absolute value is less than height() |
| @param cachingHint whether the pixels should be cached locallyZ |
| @return true if pixels are copied to dst |
| */ |
| bool readPixels(GrDirectContext* context, |
| const SkPixmap& dst, |
| int srcX, |
| int srcY, |
| CachingHint cachingHint = kAllow_CachingHint) const; |
| |
| #ifndef SK_IMAGE_READ_PIXELS_DISABLE_LEGACY_API |
| /** Deprecated. Use the variants that accept a GrDirectContext. */ |
| 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; |
| #endif |
| |
| /** The result from asyncRescaleAndReadPixels() or asyncRescaleAndReadPixelsYUV420(). */ |
| class AsyncReadResult { |
| public: |
| AsyncReadResult(const AsyncReadResult&) = delete; |
| AsyncReadResult(AsyncReadResult&&) = delete; |
| AsyncReadResult& operator=(const AsyncReadResult&) = delete; |
| AsyncReadResult& operator=(AsyncReadResult&&) = delete; |
| |
| virtual ~AsyncReadResult() = default; |
| virtual int count() const = 0; |
| virtual const void* data(int i) const = 0; |
| virtual size_t rowBytes(int i) const = 0; |
| |
| protected: |
| AsyncReadResult() = default; |
| }; |
| |
| /** Client-provided context that is passed to client-provided ReadPixelsContext. */ |
| using ReadPixelsContext = void*; |
| |
| /** Client-provided callback to asyncRescaleAndReadPixels() or |
| asyncRescaleAndReadPixelsYUV420() that is called when read result is ready or on failure. |
| */ |
| using ReadPixelsCallback = void(ReadPixelsContext, std::unique_ptr<const AsyncReadResult>); |
| |
| enum class RescaleGamma : bool { kSrc, kLinear }; |
| |
| enum class RescaleMode { |
| kNearest, |
| kLinear, |
| kRepeatedLinear, |
| kRepeatedCubic, |
| }; |
| |
| /** Makes image pixel data available to caller, possibly asynchronously. It can also rescale |
| the image pixels. |
| |
| Currently asynchronous reads are only supported on the GPU backend and only when the |
| underlying 3D API supports transfer buffers and CPU/GPU synchronization primitives. In all |
| other cases this operates synchronously. |
| |
| Data is read from the source sub-rectangle, is optionally converted to a linear gamma, is |
| rescaled to the size indicated by 'info', is then converted to the color space, color type, |
| and alpha type of 'info'. A 'srcRect' that is not contained by the bounds of the image |
| causes failure. |
| |
| When the pixel data is ready the caller's ReadPixelsCallback is called with a |
| AsyncReadResult containing pixel data in the requested color type, alpha type, and color |
| space. The AsyncReadResult will have count() == 1. Upon failure the callback is called with |
| nullptr for AsyncReadResult. For a GPU image this flushes work but a submit must occur to |
| guarantee a finite time before the callback is called. |
| |
| The data is valid for the lifetime of AsyncReadResult with the exception that if the SkImage |
| is GPU-backed the data is immediately invalidated if the context is abandoned or |
| destroyed. |
| |
| @param info info of the requested pixels |
| @param srcRect subrectangle of image to read |
| @param rescaleGamma controls whether rescaling is done in the image's gamma or whether |
| the source data is transformed to a linear gamma before rescaling. |
| @param rescaleMode controls the technique (and cost) of the rescaling |
| @param callback function to call with result of the read |
| @param context passed to callback |
| */ |
| void asyncRescaleAndReadPixels(const SkImageInfo& info, |
| const SkIRect& srcRect, |
| RescaleGamma rescaleGamma, |
| RescaleMode rescaleMode, |
| ReadPixelsCallback callback, |
| ReadPixelsContext context) const; |
| |
| /** |
| Similar to asyncRescaleAndReadPixels but performs an additional conversion to YUV. The |
| RGB->YUV conversion is controlled by 'yuvColorSpace'. The YUV data is returned as three |
| planes ordered y, u, v. The u and v planes are half the width and height of the resized |
| rectangle. The y, u, and v values are single bytes. Currently this fails if 'dstSize' |
| width and height are not even. A 'srcRect' that is not contained by the bounds of the |
| image causes failure. |
| |
| When the pixel data is ready the caller's ReadPixelsCallback is called with a |
| AsyncReadResult containing the planar data. The AsyncReadResult will have count() == 3. |
| Upon failure the callback is called with nullptr for AsyncReadResult. For a GPU image this |
| flushes work but a submit must occur to guarantee a finite time before the callback is |
| called. |
| |
| The data is valid for the lifetime of AsyncReadResult with the exception that if the SkImage |
| is GPU-backed the data is immediately invalidated if the context is abandoned or |
| destroyed. |
| |
| @param yuvColorSpace The transformation from RGB to YUV. Applied to the resized image |
| after it is converted to dstColorSpace. |
| @param dstColorSpace The color space to convert the resized image to, after rescaling. |
| @param srcRect The portion of the image to rescale and convert to YUV planes. |
| @param dstSize The size to rescale srcRect to |
| @param rescaleGamma controls whether rescaling is done in the image's gamma or whether |
| the source data is transformed to a linear gamma before rescaling. |
| @param rescaleMode controls the technique (and cost) of the rescaling |
| @param callback function to call with the planar read result |
| @param context passed to callback |
| */ |
| void asyncRescaleAndReadPixelsYUV420(SkYUVColorSpace yuvColorSpace, |
| sk_sp<SkColorSpace> dstColorSpace, |
| const SkIRect& srcRect, |
| const SkISize& dstSize, |
| RescaleGamma rescaleGamma, |
| RescaleMode rescaleMode, |
| ReadPixelsCallback callback, |
| ReadPixelsContext context) const; |
| |
| /** |
| * Identical to asyncRescaleAndReadPixelsYUV420 but a fourth plane is returned in the |
| * AsyncReadResult passed to 'callback'. The fourth plane contains the alpha chanel at the |
| * same full resolution as the Y plane. |
| */ |
| void asyncRescaleAndReadPixelsYUVA420(SkYUVColorSpace yuvColorSpace, |
| sk_sp<SkColorSpace> dstColorSpace, |
| const SkIRect& srcRect, |
| const SkISize& dstSize, |
| RescaleGamma rescaleGamma, |
| RescaleMode rescaleMode, |
| ReadPixelsCallback callback, |
| ReadPixelsContext context) const; |
| |
| /** Copies SkImage 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 SkImage SkColorType is |
| kGray_8_SkColorType, or kAlpha_8_SkColorType; dst.colorType() must match. |
| If SkImage SkColorType is kGray_8_SkColorType, dst.colorSpace() must match. |
| If SkImage SkAlphaType is kOpaque_SkAlphaType, dst.alphaType() must |
| match. If SkImage SkColorSpace is nullptr, dst.colorSpace() must match. Returns |
| false if pixel conversion is not possible. |
| |
| If cachingHint is kAllow_CachingHint, pixels may be retained locally. |
| If cachingHint is kDisallow_CachingHint, pixels are not added to the local cache. |
| |
| @param dst destination SkPixmap: SkImageInfo, pixels, row bytes |
| @return true if pixels are scaled to fit dst |
| */ |
| bool scalePixels(const SkPixmap& dst, const SkSamplingOptions&, |
| CachingHint cachingHint = kAllow_CachingHint) const; |
| |
| /** Returns encoded SkImage pixels as SkData, if SkImage was created from supported |
| encoded stream format. Platform support for formats vary and may require building |
| with one or more of: SK_ENCODE_JPEG, SK_ENCODE_PNG, SK_ENCODE_WEBP. |
| |
| Returns nullptr if SkImage contents are not encoded. |
| |
| @return encoded SkImage, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_refEncodedData |
| */ |
| sk_sp<SkData> refEncodedData() const; |
| |
| /** Returns subset of this image. |
| |
| Returns nullptr if any of the following are true: |
| - Subset is empty |
| - Subset is not contained inside the image's bounds |
| - Pixels in the source image could not be read or copied |
| - This image is texture-backed and the provided context is null or does not match |
| the source image's context. |
| |
| If the source image was texture-backed, the resulting image will be texture-backed also. |
| Otherwise, the returned image will be raster-backed. |
| |
| @param direct the GrDirectContext of the source image (nullptr is ok if the source image |
| is not texture-backed). |
| @param subset bounds of returned SkImage |
| @return the subsetted image, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_makeSubset |
| */ |
| virtual sk_sp<SkImage> makeSubset(GrDirectContext* direct, const SkIRect& subset) const = 0; |
| |
| struct RequiredProperties { |
| bool fMipmapped; |
| |
| bool operator==(const RequiredProperties& other) const { |
| return fMipmapped == other.fMipmapped; |
| } |
| |
| bool operator!=(const RequiredProperties& other) const { return !(*this == other); } |
| |
| bool operator<(const RequiredProperties& other) const { |
| return fMipmapped < other.fMipmapped; |
| } |
| }; |
| |
| /** Returns subset of this image. |
| |
| Returns nullptr if any of the following are true: |
| - Subset is empty |
| - Subset is not contained inside the image's bounds |
| - Pixels in the image could not be read or copied |
| - This image is texture-backed and the provided context is null or does not match |
| the source image's context. |
| |
| If the source image was texture-backed, the resulting image will be texture-backed also. |
| Otherwise, the returned image will be raster-backed. |
| |
| @param recorder the recorder of the source image (nullptr is ok if the |
| source image was texture-backed). |
| @param subset bounds of returned SkImage |
| @param RequiredProperties properties the returned SkImage must possess (e.g. mipmaps) |
| @return the subsetted image, or nullptr |
| */ |
| virtual sk_sp<SkImage> makeSubset(skgpu::graphite::Recorder*, |
| const SkIRect& subset, |
| RequiredProperties) const = 0; |
| |
| /** |
| * Returns true if the image has mipmap levels. |
| */ |
| bool hasMipmaps() const; |
| |
| /** |
| * Returns true if the image holds protected content. |
| */ |
| bool isProtected() const; |
| |
| /** |
| * Returns an image with the same "base" pixels as the this image, but with mipmap levels |
| * automatically generated and attached. |
| */ |
| sk_sp<SkImage> withDefaultMipmaps() const; |
| |
| /** Returns raster image or lazy image. Copies SkImage backed by GPU texture into |
| CPU memory if needed. Returns original SkImage if decoded in raster bitmap, |
| or if encoded in a stream. |
| |
| Returns nullptr if backed by GPU texture and copy fails. |
| |
| @return raster image, lazy image, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_makeNonTextureImage |
| */ |
| sk_sp<SkImage> makeNonTextureImage(GrDirectContext* = nullptr) const; |
| |
| /** Returns raster image. Copies SkImage backed by GPU texture into CPU memory, |
| or decodes SkImage from lazy image. Returns original SkImage if decoded in |
| raster bitmap. |
| |
| Returns nullptr if copy, decode, or pixel read fails. |
| |
| If cachingHint is kAllow_CachingHint, pixels may be retained locally. |
| If cachingHint is kDisallow_CachingHint, pixels are not added to the local cache. |
| |
| @return raster image, or nullptr |
| |
| example: https://fiddle.skia.org/c/@Image_makeRasterImage |
| */ |
| sk_sp<SkImage> makeRasterImage(GrDirectContext*, |
| CachingHint cachingHint = kDisallow_CachingHint) const; |
| |
| #if !defined(SK_IMAGE_READ_PIXELS_DISABLE_LEGACY_API) |
| sk_sp<SkImage> makeRasterImage(CachingHint cachingHint = kDisallow_CachingHint) const { |
| return this->makeRasterImage(nullptr, cachingHint); |
| } |
| #endif |
| |
| /** Deprecated. |
| */ |
| enum LegacyBitmapMode { |
| kRO_LegacyBitmapMode, //!< returned bitmap is read-only and immutable |
| }; |
| |
| /** Deprecated. |
| Creates raster SkBitmap with same pixels as SkImage. If legacyBitmapMode is |
| kRO_LegacyBitmapMode, returned bitmap is read-only and immutable. |
| Returns true if SkBitmap is stored in bitmap. Returns false and resets bitmap if |
| SkBitmap write did not succeed. |
| |
| @param bitmap storage for legacy SkBitmap |
| @param legacyBitmapMode bitmap is read-only and immutable |
| @return true if SkBitmap was created |
| */ |
| bool asLegacyBitmap(SkBitmap* bitmap, |
| LegacyBitmapMode legacyBitmapMode = kRO_LegacyBitmapMode) const; |
| |
| /** Returns true if SkImage is backed by an image-generator or other service that creates |
| and caches its pixels or texture on-demand. |
| |
| @return true if SkImage is created as needed |
| |
| example: https://fiddle.skia.org/c/@Image_isLazyGenerated_a |
| example: https://fiddle.skia.org/c/@Image_isLazyGenerated_b |
| */ |
| virtual bool isLazyGenerated() const = 0; |
| |
| /** Creates SkImage in target SkColorSpace. |
| Returns nullptr if SkImage could not be created. |
| |
| Returns original SkImage if it is in target SkColorSpace. |
| Otherwise, converts pixels from SkImage SkColorSpace to target SkColorSpace. |
| If SkImage colorSpace() returns nullptr, SkImage SkColorSpace is assumed to be sRGB. |
| |
| If this image is texture-backed, the context parameter is required and must match the |
| context of the source image. |
| |
| @param direct The GrDirectContext in play, if it exists |
| @param target SkColorSpace describing color range of returned SkImage |
| @return created SkImage in target SkColorSpace |
| |
| example: https://fiddle.skia.org/c/@Image_makeColorSpace |
| */ |
| virtual sk_sp<SkImage> makeColorSpace(GrDirectContext* direct, |
| sk_sp<SkColorSpace> target) const = 0; |
| |
| /** Creates SkImage in target SkColorSpace. |
| Returns nullptr if SkImage could not be created. |
| |
| Returns original SkImage if it is in target SkColorSpace. |
| Otherwise, converts pixels from SkImage SkColorSpace to target SkColorSpace. |
| If SkImage colorSpace() returns nullptr, SkImage SkColorSpace is assumed to be sRGB. |
| |
| If this image is graphite-backed, the recorder parameter is required. |
| |
| @param targetColorSpace SkColorSpace describing color range of returned SkImage |
| @param recorder The Recorder in which to create the new image |
| @param RequiredProperties properties the returned SkImage must possess (e.g. mipmaps) |
| @return created SkImage in target SkColorSpace |
| */ |
| virtual sk_sp<SkImage> makeColorSpace(skgpu::graphite::Recorder*, |
| sk_sp<SkColorSpace> targetColorSpace, |
| RequiredProperties) const = 0; |
| |
| /** Experimental. |
| Creates SkImage in target SkColorType and SkColorSpace. |
| Returns nullptr if SkImage could not be created. |
| |
| Returns original SkImage if it is in target SkColorType and SkColorSpace. |
| |
| If this image is texture-backed, the context parameter is required and must match the |
| context of the source image. |
| |
| @param direct The GrDirectContext in play, if it exists |
| @param targetColorType SkColorType of returned SkImage |
| @param targetColorSpace SkColorSpace of returned SkImage |
| @return created SkImage in target SkColorType and SkColorSpace |
| */ |
| virtual sk_sp<SkImage> makeColorTypeAndColorSpace(GrDirectContext* direct, |
| SkColorType targetColorType, |
| sk_sp<SkColorSpace> targetCS) const = 0; |
| |
| /** Experimental. |
| Creates SkImage in target SkColorType and SkColorSpace. |
| Returns nullptr if SkImage could not be created. |
| |
| Returns original SkImage if it is in target SkColorType and SkColorSpace. |
| |
| If this image is graphite-backed, the recorder parameter is required. |
| |
| @param targetColorType SkColorType of returned SkImage |
| @param targetColorSpace SkColorSpace of returned SkImage |
| @param recorder The Recorder in which to create the new image |
| @param RequiredProperties properties the returned SkImage must possess (e.g. mipmaps) |
| @return created SkImage in target SkColorType and SkColorSpace |
| */ |
| virtual sk_sp<SkImage> makeColorTypeAndColorSpace(skgpu::graphite::Recorder*, |
| SkColorType targetColorType, |
| sk_sp<SkColorSpace> targetColorSpace, |
| RequiredProperties) const = 0; |
| |
| /** Creates a new SkImage identical to this one, but with a different SkColorSpace. |
| This does not convert the underlying pixel data, so the resulting image will draw |
| differently. |
| */ |
| sk_sp<SkImage> reinterpretColorSpace(sk_sp<SkColorSpace> newColorSpace) const; |
| |
| private: |
| SkImage(const SkImageInfo& info, uint32_t uniqueID); |
| |
| friend class SkBitmap; |
| friend class SkImage_Base; // for private ctor |
| friend class SkImage_Raster; // for withMipmaps |
| friend class SkMipmapBuilder; |
| |
| SkImageInfo fInfo; |
| const uint32_t fUniqueID; |
| |
| sk_sp<SkImage> withMipmaps(sk_sp<SkMipmap>) const; |
| |
| using INHERITED = SkRefCnt; |
| }; |
| |
| #endif |
