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skia2/include/core/SkImage.h
Mike Reed 9ddf86d52a make SkColorTable private 
Bug: skia:
Change-Id: I7c00736192fe145653b171f021cff6dfc0fd34b4
Reviewed-on: https://skia-review.googlesource.com/25960
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2017-07-22 20:47:37 +00:00

486 lines
21 KiB
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/*
* 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 "SkFilterQuality.h"
#include "SkImageInfo.h"
#include "SkImageEncoder.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkShader.h"
class SkData;
class SkCanvas;
class SkImageGenerator;
class SkPaint;
class SkPicture;
class SkPixelSerializer;
class SkString;
class SkSurface;
class GrBackendTexture;
class GrContext;
class GrContextThreadSafeProxy;
class GrTexture;
struct AHardwareBuffer;
/**
* SkImage is an abstraction for drawing a rectagle 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 NULL will be
* returned.
*/
class SK_API SkImage : public SkRefCnt {
public:
typedef SkImageInfo Info;
typedef void* ReleaseContext;
static sk_sp<SkImage> MakeRasterCopy(const SkPixmap&);
static sk_sp<SkImage> MakeRasterData(const Info&, sk_sp<SkData> pixels, size_t rowBytes);
typedef void (*RasterReleaseProc)(const void* pixels, 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 NULL if the requested pixmap info is unsupported.
*/
static sk_sp<SkImage> MakeFromRaster(const SkPixmap&, RasterReleaseProc, ReleaseContext);
/**
* 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.
*/
static sk_sp<SkImage> MakeFromBitmap(const SkBitmap&);
/**
* Construct a new SkImage based on the given ImageGenerator. Returns NULL 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.
*/
static sk_sp<SkImage> MakeFromGenerator(std::unique_ptr<SkImageGenerator>,
const SkIRect* subset = nullptr);
/**
* Construct a new SkImage based on the specified encoded data. Returns NULL 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.
*/
static sk_sp<SkImage> MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset = nullptr);
typedef void (*TextureReleaseProc)(ReleaseContext);
/**
* Create a new image from the specified descriptor. Note - the caller is responsible for
* managing the lifetime of the underlying platform texture.
*
* Will return NULL if the specified backend texture is unsupported.
*/
static sk_sp<SkImage> MakeFromTexture(GrContext* ctx,
const GrBackendTexture& tex, GrSurfaceOrigin origin,
SkAlphaType at, sk_sp<SkColorSpace> cs) {
return MakeFromTexture(ctx, tex, origin, at, cs, nullptr, nullptr);
}
/**
* 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 NULL if the specified backend texture is unsupported.
*/
static sk_sp<SkImage> MakeFromTexture(GrContext*,
const GrBackendTexture&, GrSurfaceOrigin origin,
SkAlphaType, sk_sp<SkColorSpace>,
TextureReleaseProc, ReleaseContext);
/**
* 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 GL 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.
*/
static sk_sp<SkImage> MakeCrossContextFromEncoded(GrContext*, sk_sp<SkData>, bool buildMips,
SkColorSpace* dstColorSpace);
/**
* Create a new image from the specified descriptor. Note - Skia will delete or recycle the
* texture when the image is released.
*
* Will return NULL if the specified backend texture is unsupported.
*/
static sk_sp<SkImage> MakeFromAdoptedTexture(GrContext*,
const GrBackendTexture&, GrSurfaceOrigin,
SkAlphaType = kPremul_SkAlphaType,
sk_sp<SkColorSpace> = 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.
*/
static sk_sp<SkImage> MakeFromYUVTexturesCopy(GrContext*, SkYUVColorSpace,
const GrBackendObject yuvTextureHandles[3],
const SkISize yuvSizes[3],
GrSurfaceOrigin,
sk_sp<SkColorSpace> = nullptr);
/**
* Create a new image by copying the pixels from the specified y and uv 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.
*/
static sk_sp<SkImage> MakeFromNV12TexturesCopy(GrContext*, SkYUVColorSpace,
const GrBackendObject nv12TextureHandles[2],
const SkISize nv12Sizes[2], GrSurfaceOrigin,
sk_sp<SkColorSpace> = nullptr);
enum class BitDepth {
kU8,
kF16,
};
/**
* Create a new image from the specified picture.
* On creation of the SkImage, snap the SkPicture to a particular BitDepth and SkColorSpace.
*/
static sk_sp<SkImage> MakeFromPicture(sk_sp<SkPicture>, const SkISize& dimensions,
const SkMatrix*, const SkPaint*, BitDepth,
sk_sp<SkColorSpace>);
#if defined(SK_BUILD_FOR_ANDROID) && __ANDROID_API__ >= 26
/**
* Create a new image from the an Android hardware buffer.
* The new image takes a reference on the buffer.
*/
static sk_sp<SkImage> MakeFromAHardwareBuffer(AHardwareBuffer*,
SkAlphaType = kPremul_SkAlphaType,
sk_sp<SkColorSpace> = nullptr);
#endif
///////////////////////////////////////////////////////////////////////////////////////////////
int width() const { return fWidth; }
int height() const { return fHeight; }
SkISize dimensions() const { return SkISize::Make(fWidth, fHeight); }
SkIRect bounds() const { return SkIRect::MakeWH(fWidth, fHeight); }
uint32_t uniqueID() const { return fUniqueID; }
SkAlphaType alphaType() const;
/**
* Returns the color space of the SkImage.
*
* This is the color space that was supplied on creation of the SkImage or a color
* space that was parsed from encoded data. This color space is not guaranteed to be
* renderable. Can return nullptr if the SkImage was created without a color space.
*/
SkColorSpace* colorSpace() const;
sk_sp<SkColorSpace> refColorSpace() const;
/**
* Returns true fi the image will be drawn as a mask, with no intrinsic color of its own.
*/
bool isAlphaOnly() const;
bool isOpaque() const { return SkAlphaTypeIsOpaque(this->alphaType()); }
sk_sp<SkShader> makeShader(SkShader::TileMode, SkShader::TileMode,
const SkMatrix* localMatrix = nullptr) const;
/**
* Helper version of makeShader() that specifies Clamp tilemode.
*/
sk_sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const {
return this->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, localMatrix);
}
/**
* 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.
*/
bool peekPixels(SkPixmap* pixmap) const;
// DEPRECATED - currently used by Canvas2DLayerBridge in Chromium.
GrTexture* getTexture() const;
/**
* Returns true if the image is texture backed.
*/
bool isTextureBacked() const;
/**
* Returns true if the image is able to be drawn to a particular type of device. If context
* is nullptr, tests for drawability to CPU devices. Otherwise, tests for drawability to a GPU
* device backed by 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.
*/
bool isValid(GrContext* context) const;
/**
* Retrieves the backend API handle of the texture. If flushPendingGrContextIO then the
* GrContext will issue to the backend API any deferred IO 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.
*/
GrBackendObject getTextureHandle(bool flushPendingGrContextIO,
GrSurfaceOrigin* origin = nullptr) const;
/**
* 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 signals that the system's default
* behavior is fine. Passing kDisallow signals that caching should be avoided.
*/
enum CachingHint {
kAllow_CachingHint,
kDisallow_CachingHint,
};
/**
* Copy the pixels from the image into the specified buffer (pixels + rowBytes),
* converting them into the requested format (dstInfo). The image pixels are read
* starting at the specified (srcX,srcY) location.
*
* The specified ImageInfo and (srcX,srcY) offset specifies a source rectangle
*
* srcR.setXYWH(srcX, srcY, dstInfo.width(), dstInfo.height());
*
* srcR 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 the dst pixels with the
* corresponding src pixels, performing any colortype/alphatype transformations needed
* (in the case where the src and dst have different colortypes or alphatypes).
*
* This call can fail, returning false, for several reasons:
* - If srcR does not intersect the image bounds.
* - If the requested colortype/alphatype cannot be converted from the image's types.
*/
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY, CachingHint = kAllow_CachingHint) const;
bool readPixels(const SkPixmap& dst, int srcX, int srcY,
CachingHint = kAllow_CachingHint) const;
/**
* Copy the pixels from this image into the dst pixmap, converting as needed into dst's
* colortype/alphatype. If the conversion cannot be performed, false is returned.
*
* If dst's dimensions differ from the src dimension, the image will be scaled, applying the
* specified filter-quality.
*/
bool scalePixels(const SkPixmap& dst, SkFilterQuality, CachingHint = kAllow_CachingHint) 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 NULL.
*/
sk_sp<SkData> encodeToData(SkEncodedImageFormat, int quality) const;
/**
* Encode the image and return the result as SkData. This will attempt to reuse existing
* encoded data (as returned by refEncodedData).
*
* We defer to the SkPixelSerializer both for vetting existing encoded data
* (useEncodedData) and for encoding the image (encode) when no such data is
* present or is rejected by the serializer.
*
* If not specified, we use a default serializer which 1) always accepts existing data
* (in any format) and 2) encodes to PNG.
*
* If no compatible encoded data exists and encoding fails, this method will also
* fail (return NULL).
*/
sk_sp<SkData> encodeToData(SkPixelSerializer* = nullptr) 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 NULL.
*
* Note: to force the image to return its contents as encoded data, use encodeToData(...).
*/
sk_sp<SkData> refEncodedData() const;
const char* toString(SkString*) 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,
* NULL will be returned.
*/
sk_sp<SkImage> makeSubset(const SkIRect& subset) 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.
*/
sk_sp<SkImage> makeTextureImage(GrContext*, SkColorSpace* dstColorSpace) 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.
*/
sk_sp<SkImage> makeNonTextureImage() 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 which may be produced to the
* given rect.
*
* offset is the amount to translate the resulting image relative to the src when it is drawn.
* This is an out-param.
*
* 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.
*/
sk_sp<SkImage> makeWithFilter(const SkImageFilter* filter, const SkIRect& subset,
const SkIRect& clipBounds, SkIRect* outSubset,
SkIPoint* offset) const;
/** Drawing params for which a deferred texture image data should be optimized. */
struct DeferredTextureImageUsageParams {
DeferredTextureImageUsageParams(const SkMatrix matrix, const SkFilterQuality quality,
int preScaleMipLevel)
: fMatrix(matrix), fQuality(quality), fPreScaleMipLevel(preScaleMipLevel) {}
SkMatrix fMatrix;
SkFilterQuality fQuality;
int fPreScaleMipLevel;
};
/**
* 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 pre-uploaded texture data
* and for retrieving the data. The params array represents the set of draws over which to
* optimize the pre-upload data.
*
* 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 ARGB_4444), then dstColorSpace
* must be null.
*/
size_t getDeferredTextureImageData(const GrContextThreadSafeProxy&,
const DeferredTextureImageUsageParams[],
int paramCnt,
void* buffer,
SkColorSpace* dstColorSpace = nullptr,
SkColorType dstColorType = kN32_SkColorType) const;
/**
* Returns a texture-backed image from data produced in SkImage::getDeferredTextureImageData.
* The context must be the context that provided the proxy passed to
* getDeferredTextureImageData.
*/
static sk_sp<SkImage> MakeFromDeferredTextureImageData(GrContext*, const void*, SkBudgeted);
// Helper functions to convert to SkBitmap
enum LegacyBitmapMode {
kRO_LegacyBitmapMode,
kRW_LegacyBitmapMode,
};
/**
* 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 (read-only), the resulting bitmap will be marked as immutable.
*
* On succcess, returns true. On failure, returns false and the bitmap parameter will be reset
* to empty.
*/
bool asLegacyBitmap(SkBitmap*, LegacyBitmapMode) const;
/**
* Returns true if the image is backed by an image-generator or other src that creates
* (and caches) its pixels / texture on-demand.
*/
bool isLazyGenerated() const;
/**
* If |target| is supported, returns an SkImage in the |target| color space.
* Otherwise, returns nullptr.
*
* This will leave the image as is if it already in the |target| color space.
* Otherwise, it will convert the pixels from the src color space to the |target|
* color space. If this->colorSpace() is nullptr, the src color space will be
* treated as sRGB.
*
* If |premulBehavior| is kIgnore, any premultiplication or unpremultiplication will
* be performed in the gamma encoded space. If it is kRespect, premultiplication is
* assumed to be linear.
*/
sk_sp<SkImage> makeColorSpace(sk_sp<SkColorSpace> target,
SkTransferFunctionBehavior premulBehavior) const;
private:
SkImage(int width, int height, uint32_t uniqueID);
friend class SkImage_Base;
static sk_sp<SkImage> MakeTextureFromMipMap(GrContext*, const SkImageInfo&,
const GrMipLevel texels[], int mipLevelCount,
SkBudgeted, SkDestinationSurfaceColorMode);
const int fWidth;
const int fHeight;
const uint32_t fUniqueID;
typedef SkRefCnt INHERITED;
};
#endif
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