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skia2/include/core/SkSurface.h
Greg Daniel 8561fc23c9 Update gpu flush semaphore contract. 
From my scanning of clients this should not change how any of our main
users interact with semaphores. The biggest change here is that we don't
give up on submitted all the semaphores if a creation fails. We just
submit the semaphores we do have. It also makes it explicit that the
client is responsible for deleting any initialized semaphore regardless
if we were able to submit the semaphores or not or if the semaphore was
wrapped or created by Skia.

The motivation for this change is to more align the current API with
how things will work when we separate flushing and submit into different
calls.

Bug: skia:10118
Change-Id: I3e8b5d3a9852ddb2b5dc972fee21bf46ded7a36f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/282265
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2020-04-08 17:30:16 +00:00

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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 SkSurface_DEFINED
#define SkSurface_DEFINED
#include "include/core/SkImage.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkSurfaceProps.h"
#include "include/gpu/GrTypes.h"
#if defined(SK_BUILD_FOR_ANDROID) && __ANDROID_API__ >= 26
#include <android/hardware_buffer.h>
#endif
#ifdef SK_METAL
#include "include/gpu/mtl/GrMtlTypes.h"
#endif
class SkCanvas;
class SkDeferredDisplayList;
class SkPaint;
class SkSurfaceCharacterization;
class GrBackendRenderTarget;
class GrBackendSemaphore;
class GrBackendTexture;
class GrContext;
class GrRecordingContext;
class GrRenderTarget;
/** \class SkSurface
SkSurface is responsible for managing the pixels that a canvas draws into. The pixels can be
allocated either in CPU memory (a raster surface) or on the GPU (a GrRenderTarget surface).
SkSurface takes care of allocating a SkCanvas that will draw into the surface. Call
surface->getCanvas() to use that canvas (but don't delete it, it is owned by the surface).
SkSurface always has non-zero dimensions. If there is a request for a new surface, and either
of the requested dimensions are zero, then nullptr will be returned.
*/
class SK_API SkSurface : public SkRefCnt {
public:
/** Allocates raster SkSurface. SkCanvas returned by SkSurface draws directly into pixels.
SkSurface is returned if all parameters are valid.
Valid parameters include:
info dimensions are greater than zero;
info contains SkColorType and SkAlphaType supported by raster surface;
pixels is not nullptr;
rowBytes is large enough to contain info width pixels of SkColorType.
Pixel buffer size should be info height times computed rowBytes.
Pixels are not initialized.
To access pixels after drawing, peekPixels() or readPixels().
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width and height must be greater than zero
@param pixels pointer to destination pixels buffer
@param rowBytes interval from one SkSurface row to the next
@param surfaceProps LCD striping orientation and setting for device independent fonts;
may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRasterDirect(const SkImageInfo& imageInfo, void* pixels,
size_t rowBytes,
const SkSurfaceProps* surfaceProps = nullptr);
/** Allocates raster SkSurface. SkCanvas returned by SkSurface draws directly into pixels.
releaseProc is called with pixels and context when SkSurface is deleted.
SkSurface is returned if all parameters are valid.
Valid parameters include:
info dimensions are greater than zero;
info contains SkColorType and SkAlphaType supported by raster surface;
pixels is not nullptr;
rowBytes is large enough to contain info width pixels of SkColorType.
Pixel buffer size should be info height times computed rowBytes.
Pixels are not initialized.
To access pixels after drawing, call flush() or peekPixels().
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width and height must be greater than zero
@param pixels pointer to destination pixels buffer
@param rowBytes interval from one SkSurface row to the next
@param releaseProc called when SkSurface is deleted; may be nullptr
@param context passed to releaseProc; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent fonts;
may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRasterDirectReleaseProc(const SkImageInfo& imageInfo, void* pixels,
size_t rowBytes,
void (*releaseProc)(void* pixels, void* context),
void* context, const SkSurfaceProps* surfaceProps = nullptr);
/** Allocates raster SkSurface. SkCanvas returned by SkSurface draws directly into pixels.
Allocates and zeroes pixel memory. Pixel memory size is imageInfo.height() times
rowBytes, or times imageInfo.minRowBytes() if rowBytes is zero.
Pixel memory is deleted when SkSurface is deleted.
SkSurface is returned if all parameters are valid.
Valid parameters include:
info dimensions are greater than zero;
info contains SkColorType and SkAlphaType supported by raster surface;
rowBytes is large enough to contain info width pixels of SkColorType, or is zero.
If rowBytes is zero, a suitable value will be chosen internally.
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width and height must be greater than zero
@param rowBytes interval from one SkSurface row to the next; may be zero
@param surfaceProps LCD striping orientation and setting for device independent fonts;
may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo, size_t rowBytes,
const SkSurfaceProps* surfaceProps);
/** Allocates raster SkSurface. SkCanvas returned by SkSurface draws directly into pixels.
Allocates and zeroes pixel memory. Pixel memory size is imageInfo.height() times
imageInfo.minRowBytes().
Pixel memory is deleted when SkSurface is deleted.
SkSurface is returned if all parameters are valid.
Valid parameters include:
info dimensions are greater than zero;
info contains SkColorType and SkAlphaType supported by raster surface.
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width and height must be greater than zero
@param props LCD striping orientation and setting for device independent fonts;
may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo,
const SkSurfaceProps* props = nullptr) {
return MakeRaster(imageInfo, 0, props);
}
/** Allocates raster SkSurface. SkCanvas returned by SkSurface draws directly into pixels.
Allocates and zeroes pixel memory. Pixel memory size is height times width times
four. Pixel memory is deleted when SkSurface is deleted.
Internally, sets SkImageInfo to width, height, native color type, and
kPremul_SkAlphaType.
SkSurface is returned if width and height are greater than zero.
Use to create SkSurface that matches SkPMColor, the native pixel arrangement on
the platform. SkSurface drawn to output device skips converting its pixel format.
@param width pixel column count; must be greater than zero
@param height pixel row count; must be greater than zero
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRasterN32Premul(int width, int height,
const SkSurfaceProps* surfaceProps = nullptr);
/** Caller data passed to RenderTarget/TextureReleaseProc; may be nullptr. */
typedef void* ReleaseContext;
/** User function called when supplied render target may be deleted. */
typedef void (*RenderTargetReleaseProc)(ReleaseContext releaseContext);
/** User function called when supplied texture may be deleted. */
typedef void (*TextureReleaseProc)(ReleaseContext releaseContext);
/** Wraps a GPU-backed texture into SkSurface. Caller must ensure the texture is
valid for the lifetime of returned SkSurface. If sampleCnt greater than zero,
creates an intermediate MSAA SkSurface which is used for drawing backendTexture.
SkSurface is returned if all parameters are valid. backendTexture is valid if
its pixel configuration agrees with colorSpace and context; for instance, if
backendTexture has an sRGB configuration, then context must support sRGB,
and colorSpace must be present. Further, backendTexture width and height must
not exceed context capabilities, and the context must be able to support
back-end textures.
If SK_SUPPORT_GPU is defined as zero, has no effect and returns nullptr.
@param context GPU context
@param backendTexture texture residing on GPU
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@param textureReleaseProc function called when texture can be released
@param releaseContext state passed to textureReleaseProc
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeFromBackendTexture(GrContext* context,
const GrBackendTexture& backendTexture,
GrSurfaceOrigin origin, int sampleCnt,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps,
TextureReleaseProc textureReleaseProc = nullptr,
ReleaseContext releaseContext = nullptr);
/** Wraps a GPU-backed buffer into SkSurface. Caller must ensure backendRenderTarget
is valid for the lifetime of returned SkSurface.
SkSurface is returned if all parameters are valid. backendRenderTarget is valid if
its pixel configuration agrees with colorSpace and context; for instance, if
backendRenderTarget has an sRGB configuration, then context must support sRGB,
and colorSpace must be present. Further, backendRenderTarget width and height must
not exceed context capabilities, and the context must be able to support
back-end render targets.
If SK_SUPPORT_GPU is defined as zero, has no effect and returns nullptr.
@param context GPU context
@param backendRenderTarget GPU intermediate memory buffer
@param colorSpace range of colors
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@param releaseProc function called when texture can be released
@param releaseContext state passed to textureReleaseProc
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeFromBackendRenderTarget(GrContext* context,
const GrBackendRenderTarget& backendRenderTarget,
GrSurfaceOrigin origin,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps,
RenderTargetReleaseProc releaseProc = nullptr,
ReleaseContext releaseContext = nullptr);
/** Wraps a GPU-backed texture into SkSurface. Caller must ensure backendTexture is
valid for the lifetime of returned SkSurface. If sampleCnt greater than zero,
creates an intermediate MSAA SkSurface which is used for drawing backendTexture.
SkSurface is returned if all parameters are valid. backendTexture is valid if
its pixel configuration agrees with colorSpace and context; for instance, if
backendTexture has an sRGB configuration, then context must support sRGB,
and colorSpace must be present. Further, backendTexture width and height must
not exceed context capabilities.
Returned SkSurface is available only for drawing into, and cannot generate an
SkImage.
If SK_SUPPORT_GPU is defined as zero, has no effect and returns nullptr.
@param context GPU context
@param backendTexture texture residing on GPU
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeFromBackendTextureAsRenderTarget(GrContext* context,
const GrBackendTexture& backendTexture,
GrSurfaceOrigin origin,
int sampleCnt,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
#if defined(SK_BUILD_FOR_ANDROID) && __ANDROID_API__ >= 26
/** Private.
Creates SkSurface from Android hardware buffer.
Returned SkSurface takes a reference on the buffer. The ref on the buffer will be released
when the SkSurface is destroyed and there is no pending work on the GPU involving the
buffer.
Only available on Android, when __ANDROID_API__ is defined to be 26 or greater.
Currently this is only supported for buffers that can be textured as well as rendered to.
In other words that must have both AHARDWAREBUFFER_USAGE_GPU_COLOR_OUTPUT and
AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE usage bits.
@param context GPU context
@param hardwareBuffer AHardwareBuffer Android hardware buffer
@param colorSpace range of colors; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@return created SkSurface, or nullptr
*/
static sk_sp<SkSurface> MakeFromAHardwareBuffer(GrContext* context,
AHardwareBuffer* hardwareBuffer,
GrSurfaceOrigin origin,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
#endif
#ifdef SK_METAL
/** Creates SkSurface from CAMetalLayer.
Returned SkSurface takes a reference on the CAMetalLayer. The ref on the layer will be
released when the SkSurface is destroyed.
Only available when Metal API is enabled.
Will grab the current drawable from the layer and use its texture as a backendRT to
create a renderable surface.
@param context GPU context
@param layer GrMTLHandle (expected to be a CAMetalLayer*)
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@param drawable Pointer to drawable to be filled in when this surface is
instantiated; may not be nullptr
@return created SkSurface, or nullptr
*/
static sk_sp<SkSurface> MakeFromCAMetalLayer(GrContext* context,
GrMTLHandle layer,
GrSurfaceOrigin origin,
int sampleCnt,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps,
GrMTLHandle* drawable);
/** Creates SkSurface from MTKView.
Returned SkSurface takes a reference on the MTKView. The ref on the layer will be
released when the SkSurface is destroyed.
Only available when Metal API is enabled.
Will grab the current drawable from the layer and use its texture as a backendRT to
create a renderable surface.
@param context GPU context
@param layer GrMTLHandle (expected to be a MTKView*)
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors; may be nullptr
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@return created SkSurface, or nullptr
*/
static sk_sp<SkSurface> MakeFromMTKView(GrContext* context,
GrMTLHandle mtkView,
GrSurfaceOrigin origin,
int sampleCnt,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps)
SK_API_AVAILABLE(macos(10.11), ios(9.0));
#endif
/** Returns SkSurface on GPU indicated by context. Allocates memory for
pixels, based on the width, height, and SkColorType in SkImageInfo. budgeted
selects whether allocation for pixels is tracked by context. imageInfo
describes the pixel format in SkColorType, and transparency in
SkAlphaType, and color matching in SkColorSpace.
sampleCount requests the number of samples per pixel.
Pass zero to disable multi-sample anti-aliasing. The request is rounded
up to the next supported count, or rounded down if it is larger than the
maximum supported count.
surfaceOrigin pins either the top-left or the bottom-left corner to the origin.
shouldCreateWithMips hints that SkImage returned by makeImageSnapshot() is mip map.
If SK_SUPPORT_GPU is defined as zero, has no effect and returns nullptr.
@param context GPU context
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace;
width, or height, or both, may be zero
@param sampleCount samples per pixel, or 0 to disable full scene anti-aliasing
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@param shouldCreateWithMips hint that SkSurface will host mip map images
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
const SkImageInfo& imageInfo,
int sampleCount, GrSurfaceOrigin surfaceOrigin,
const SkSurfaceProps* surfaceProps,
bool shouldCreateWithMips = false);
/** Returns SkSurface on GPU indicated by context. Allocates memory for
pixels, based on the width, height, and SkColorType in SkImageInfo. budgeted
selects whether allocation for pixels is tracked by context. imageInfo
describes the pixel format in SkColorType, and transparency in
SkAlphaType, and color matching in SkColorSpace.
sampleCount requests the number of samples per pixel.
Pass zero to disable multi-sample anti-aliasing. The request is rounded
up to the next supported count, or rounded down if it is larger than the
maximum supported count.
SkSurface bottom-left corner is pinned to the origin.
@param context GPU context
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width, or height, or both, may be zero
@param sampleCount samples per pixel, or 0 to disable multi-sample anti-aliasing
@param surfaceProps LCD striping orientation and setting for device independent
fonts; may be nullptr
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
const SkImageInfo& imageInfo, int sampleCount,
const SkSurfaceProps* surfaceProps) {
return MakeRenderTarget(context, budgeted, imageInfo, sampleCount,
kBottomLeft_GrSurfaceOrigin, surfaceProps);
}
/** Returns SkSurface on GPU indicated by context. Allocates memory for
pixels, based on the width, height, and SkColorType in SkImageInfo. budgeted
selects whether allocation for pixels is tracked by context. imageInfo
describes the pixel format in SkColorType, and transparency in
SkAlphaType, and color matching in SkColorSpace.
SkSurface bottom-left corner is pinned to the origin.
@param context GPU context
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of raster surface; width, or height, or both, may be zero
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
const SkImageInfo& imageInfo) {
if (!imageInfo.width() || !imageInfo.height()) {
return nullptr;
}
return MakeRenderTarget(context, budgeted, imageInfo, 0, kBottomLeft_GrSurfaceOrigin,
nullptr);
}
/** Returns SkSurface on GPU indicated by context that is compatible with the provided
characterization. budgeted selects whether allocation for pixels is tracked by context.
@param context GPU context
@param characterization description of the desired SkSurface
@return SkSurface if all parameters are valid; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeRenderTarget(GrRecordingContext* context,
const SkSurfaceCharacterization& characterization,
SkBudgeted budgeted);
/** Wraps a backend texture in an SkSurface - setting up the surface to match the provided
characterization. The caller must ensure the texture is valid for the lifetime of
returned SkSurface.
If the backend texture and surface characterization are incompatible then null will
be returned.
Usually, the GrContext::createBackendTexture variant that takes a surface characterization
should be used to create the backend texture. If not,
SkSurfaceCharacterization::isCompatible can be used to determine if a given backend texture
is compatible with a specific surface characterization.
@param context GPU context
@param characterization characterization of the desired surface
@param backendTexture texture residing on GPU
@param textureReleaseProc function called when texture can be released
@param releaseContext state passed to textureReleaseProc
@return SkSurface if all parameters are compatible; otherwise, nullptr
*/
static sk_sp<SkSurface> MakeFromBackendTexture(GrContext* context,
const SkSurfaceCharacterization& characterzation,
const GrBackendTexture& backendTexture,
TextureReleaseProc textureReleaseProc = nullptr,
ReleaseContext releaseContext = nullptr);
/** Is this surface compatible with the provided characterization?
This method can be used to determine if an existing SkSurface is a viable destination
for an SkDeferredDisplayList.
@param characterization The characterization for which a compatibility check is desired
@return true if this surface is compatible with the characterization;
false otherwise
*/
bool isCompatible(const SkSurfaceCharacterization& characterization) const;
/** Returns SkSurface without backing pixels. Drawing to SkCanvas returned from SkSurface
has no effect. Calling makeImageSnapshot() on returned SkSurface returns nullptr.
@param width one or greater
@param height one or greater
@return SkSurface if width and height are positive; otherwise, nullptr
example: https://fiddle.skia.org/c/@Surface_MakeNull
*/
static sk_sp<SkSurface> MakeNull(int width, int height);
/** Returns pixel count in each row; may be zero or greater.
@return number of pixel columns
*/
int width() const { return fWidth; }
/** Returns pixel row count; may be zero or greater.
@return number of pixel rows
*/
int height() const { return fHeight; }
/** Returns an ImageInfo describing the surface.
*/
SkImageInfo imageInfo();
/** Returns unique value identifying the content of SkSurface. Returned value changes
each time the content changes. Content is changed by drawing, or by calling
notifyContentWillChange().
@return unique content identifier
example: https://fiddle.skia.org/c/@Surface_notifyContentWillChange
*/
uint32_t generationID();
/** \enum SkSurface::ContentChangeMode
ContentChangeMode members are parameters to notifyContentWillChange().
*/
enum ContentChangeMode {
kDiscard_ContentChangeMode, //!< discards surface on change
kRetain_ContentChangeMode, //!< preserves surface on change
};
/** Notifies that SkSurface contents will be changed by code outside of Skia.
Subsequent calls to generationID() return a different value.
TODO: Can kRetain_ContentChangeMode be deprecated?
example: https://fiddle.skia.org/c/@Surface_notifyContentWillChange
*/
void notifyContentWillChange(ContentChangeMode mode);
enum BackendHandleAccess {
kFlushRead_BackendHandleAccess, //!< back-end object is readable
kFlushWrite_BackendHandleAccess, //!< back-end object is writable
kDiscardWrite_BackendHandleAccess, //!< back-end object must be overwritten
};
/** Deprecated.
*/
static const BackendHandleAccess kFlushRead_TextureHandleAccess =
kFlushRead_BackendHandleAccess;
/** Deprecated.
*/
static const BackendHandleAccess kFlushWrite_TextureHandleAccess =
kFlushWrite_BackendHandleAccess;
/** Deprecated.
*/
static const BackendHandleAccess kDiscardWrite_TextureHandleAccess =
kDiscardWrite_BackendHandleAccess;
/** Retrieves the back-end texture. If SkSurface has no back-end texture, an invalid
object is returned. Call GrBackendTexture::isValid to determine if the result
is valid.
The returned GrBackendTexture should be discarded if the SkSurface is drawn to or deleted.
@return GPU texture reference; invalid on failure
*/
GrBackendTexture getBackendTexture(BackendHandleAccess backendHandleAccess);
/** Retrieves the back-end render target. If SkSurface has no back-end render target, an invalid
object is returned. Call GrBackendRenderTarget::isValid to determine if the result
is valid.
The returned GrBackendRenderTarget should be discarded if the SkSurface is drawn to
or deleted.
@return GPU render target reference; invalid on failure
*/
GrBackendRenderTarget getBackendRenderTarget(BackendHandleAccess backendHandleAccess);
/** If the surface was made via MakeFromBackendTexture then it's backing texture may be
substituted with a different texture. The contents of the previous backing texture are
copied into the new texture. SkCanvas state is preserved. The original sample count is
used. The GrBackendFormat and dimensions of replacement texture must match that of
the original.
@param backendTexture the new backing texture for the surface
@param mode Retain or discard current Content
@param textureReleaseProc function called when texture can be released
@param releaseContext state passed to textureReleaseProc
*/
bool replaceBackendTexture(const GrBackendTexture& backendTexture,
GrSurfaceOrigin origin,
ContentChangeMode mode = kRetain_ContentChangeMode,
TextureReleaseProc textureReleaseProc = nullptr,
ReleaseContext releaseContext = nullptr);
/** Returns SkCanvas that draws into SkSurface. Subsequent calls return the same SkCanvas.
SkCanvas returned is managed and owned by SkSurface, and is deleted when SkSurface
is deleted.
@return drawing SkCanvas for SkSurface
example: https://fiddle.skia.org/c/@Surface_getCanvas
*/
SkCanvas* getCanvas();
/** Returns a compatible SkSurface, or nullptr. Returned SkSurface contains
the same raster, GPU, or null properties as the original. Returned SkSurface
does not share the same pixels.
Returns nullptr if imageInfo width or height are zero, or if imageInfo
is incompatible with SkSurface.
@param imageInfo width, height, SkColorType, SkAlphaType, SkColorSpace,
of SkSurface; width and height must be greater than zero
@return compatible SkSurface or nullptr
example: https://fiddle.skia.org/c/@Surface_makeSurface
*/
sk_sp<SkSurface> makeSurface(const SkImageInfo& imageInfo);
/** Calls makeSurface(ImageInfo) with the same ImageInfo as this surface, but with the
* specified width and height.
*/
sk_sp<SkSurface> makeSurface(int width, int height);
/** Returns SkImage capturing SkSurface contents. Subsequent drawing to SkSurface contents
are not captured. SkImage allocation is accounted for if SkSurface was created with
SkBudgeted::kYes.
@return SkImage initialized with SkSurface contents
example: https://fiddle.skia.org/c/@Surface_makeImageSnapshot
*/
sk_sp<SkImage> makeImageSnapshot();
/**
* Like the no-parameter version, this returns an image of the current surface contents.
* This variant takes a rectangle specifying the subset of the surface that is of interest.
* These bounds will be sanitized before being used.
* - If bounds extends beyond the surface, it will be trimmed to just the intersection of
* it and the surface.
* - If bounds does not intersect the surface, then this returns nullptr.
* - If bounds == the surface, then this is the same as calling the no-parameter variant.
example: https://fiddle.skia.org/c/@Surface_makeImageSnapshot_2
*/
sk_sp<SkImage> makeImageSnapshot(const SkIRect& bounds);
/** Draws SkSurface contents to canvas, with its top-left corner at (x, y).
If SkPaint paint is not nullptr, apply SkColorFilter, alpha, SkImageFilter,
SkBlendMode, and SkDrawLooper.
@param canvas SkCanvas drawn into
@param x horizontal offset in SkCanvas
@param y vertical offset in SkCanvas
@param paint SkPaint containing SkBlendMode, SkColorFilter, SkImageFilter,
and so on; or nullptr
example: https://fiddle.skia.org/c/@Surface_draw
*/
void draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint);
/** Copies SkSurface pixel address, row bytes, and SkImageInfo to SkPixmap, if address
is available, and returns true. If pixel address is not available, return
false and leave SkPixmap unchanged.
pixmap contents become invalid on any future change to SkSurface.
@param pixmap storage for pixel state if pixels are readable; otherwise, ignored
@return true if SkSurface has direct access to pixels
example: https://fiddle.skia.org/c/@Surface_peekPixels
*/
bool peekPixels(SkPixmap* pixmap);
/** Copies SkRect of pixels to dst.
Source SkRect corners are (srcX, srcY) and SkSurface (width(), height()).
Destination SkRect corners are (0, 0) and (dst.width(), dst.height()).
Copies each readable pixel intersecting both rectangles, without scaling,
converting to dst.colorType() and dst.alphaType() if required.
Pixels are readable when SkSurface is raster, or backed by a GPU.
The destination pixel storage must be allocated by the caller.
Pixel values are converted only if SkColorType and SkAlphaType
do not match. Only pixels within both source and destination rectangles
are copied. dst contents outside SkRect intersection are unchanged.
Pass negative values for srcX or srcY to offset pixels across or down destination.
Does not copy, and returns false if:
- Source and destination rectangles do not intersect.
- SkPixmap pixels could not be allocated.
- dst.rowBytes() is too small to contain one row of pixels.
@param dst storage for pixels copied from SkSurface
@param srcX offset into readable pixels on x-axis; may be negative
@param srcY offset into readable pixels on y-axis; may be negative
@return true if pixels were copied
example: https://fiddle.skia.org/c/@Surface_readPixels
*/
bool readPixels(const SkPixmap& dst, int srcX, int srcY);
/** Copies SkRect of pixels from SkCanvas into dstPixels.
Source SkRect corners are (srcX, srcY) and SkSurface (width(), height()).
Destination SkRect corners are (0, 0) and (dstInfo.width(), dstInfo.height()).
Copies each readable pixel intersecting both rectangles, without scaling,
converting to dstInfo.colorType() and dstInfo.alphaType() if required.
Pixels are readable when SkSurface is raster, or backed by a GPU.
The destination pixel storage must be allocated by the caller.
Pixel values are converted only if SkColorType and SkAlphaType
do not match. Only pixels within both source and destination rectangles
are copied. dstPixels contents outside SkRect intersection are unchanged.
Pass negative values for srcX or srcY to offset pixels across or down destination.
Does not copy, and returns false if:
- Source and destination rectangles do not intersect.
- SkSurface pixels could not be converted to dstInfo.colorType() or dstInfo.alphaType().
- dstRowBytes is too small to contain one row of pixels.
@param dstInfo width, height, SkColorType, and SkAlphaType of dstPixels
@param dstPixels storage for pixels; dstInfo.height() times dstRowBytes, or larger
@param dstRowBytes size of one destination row; dstInfo.width() times pixel size, or larger
@param srcX offset into readable pixels on x-axis; may be negative
@param srcY offset into readable pixels on y-axis; may be negative
@return true if pixels were copied
*/
bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
int srcX, int srcY);
/** Copies SkRect of pixels from SkSurface into bitmap.
Source SkRect corners are (srcX, srcY) and SkSurface (width(), height()).
Destination SkRect corners are (0, 0) and (bitmap.width(), bitmap.height()).
Copies each readable pixel intersecting both rectangles, without scaling,
converting to bitmap.colorType() and bitmap.alphaType() if required.
Pixels are readable when SkSurface is raster, or backed by a GPU.
The destination pixel storage must be allocated by the caller.
Pixel values are converted only if SkColorType and SkAlphaType
do not match. Only pixels within both source and destination rectangles
are copied. dst contents outside SkRect intersection are unchanged.
Pass negative values for srcX or srcY to offset pixels across or down destination.
Does not copy, and returns false if:
- Source and destination rectangles do not intersect.
- SkSurface pixels could not be converted to dst.colorType() or dst.alphaType().
- dst pixels could not be allocated.
- dst.rowBytes() is too small to contain one row of pixels.
@param dst storage for pixels copied from SkSurface
@param srcX offset into readable pixels on x-axis; may be negative
@param srcY offset into readable pixels on y-axis; may be negative
@return true if pixels were copied
example: https://fiddle.skia.org/c/@Surface_readPixels_3
*/
bool readPixels(const SkBitmap& dst, int srcX, int srcY);
/** 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>);
/** Controls the gamma that rescaling occurs in for asyncRescaleAndReadPixels() and
asyncRescaleAndReadPixelsYUV420().
*/
enum RescaleGamma : bool { kSrc, kLinear };
/** Makes surface pixel data available to caller, possibly asynchronously. It can also rescale
the surface 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 surface
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.
The data is valid for the lifetime of AsyncReadResult with the exception that if the
SkSurface is GPU-backed the data is immediately invalidated if the GrContext is abandoned
or destroyed.
@param info info of the requested pixels
@param srcRect subrectangle of surface to read
@param rescaleGamma controls whether rescaling is done in the surface's gamma or whether
the source data is transformed to a linear gamma before rescaling.
@param rescaleQuality controls the quality (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, SkFilterQuality rescaleQuality,
ReadPixelsCallback callback, ReadPixelsContext context);
/**
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
surface 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.
The data is valid for the lifetime of AsyncReadResult with the exception that if the
SkSurface is GPU-backed the data is immediately invalidated if the GrContext 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 surface to rescale and convert to YUV planes.
@param dstSize The size to rescale srcRect to
@param rescaleGamma controls whether rescaling is done in the surface's gamma or whether
the source data is transformed to a linear gamma before rescaling.
@param rescaleQuality controls the quality (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,
SkFilterQuality rescaleQuality,
ReadPixelsCallback callback,
ReadPixelsContext);
/** Copies SkRect of pixels from the src SkPixmap to the SkSurface.
Source SkRect corners are (0, 0) and (src.width(), src.height()).
Destination SkRect corners are (dstX, dstY) and
(dstX + Surface width(), dstY + Surface height()).
Copies each readable pixel intersecting both rectangles, without scaling,
converting to SkSurface colorType() and SkSurface alphaType() if required.
@param src storage for pixels to copy to SkSurface
@param dstX x-axis position relative to SkSurface to begin copy; may be negative
@param dstY y-axis position relative to SkSurface to begin copy; may be negative
example: https://fiddle.skia.org/c/@Surface_writePixels
*/
void writePixels(const SkPixmap& src, int dstX, int dstY);
/** Copies SkRect of pixels from the src SkBitmap to the SkSurface.
Source SkRect corners are (0, 0) and (src.width(), src.height()).
Destination SkRect corners are (dstX, dstY) and
(dstX + Surface width(), dstY + Surface height()).
Copies each readable pixel intersecting both rectangles, without scaling,
converting to SkSurface colorType() and SkSurface alphaType() if required.
@param src storage for pixels to copy to SkSurface
@param dstX x-axis position relative to SkSurface to begin copy; may be negative
@param dstY y-axis position relative to SkSurface to begin copy; may be negative
example: https://fiddle.skia.org/c/@Surface_writePixels_2
*/
void writePixels(const SkBitmap& src, int dstX, int dstY);
/** Returns SkSurfaceProps for surface.
@return LCD striping orientation and setting for device independent fonts
*/
const SkSurfaceProps& props() const { return fProps; }
/** Issues pending SkSurface commands to the GPU-backed API and resolves any SkSurface MSAA.
Skia flushes as needed, so it is not necessary to call this if Skia manages
drawing and object lifetime. Call when interleaving Skia calls with native
GPU calls.
*/
void flush();
enum class BackendSurfaceAccess {
kNoAccess, //!< back-end object will not be used by client
kPresent, //!< back-end surface will be used for presenting to screen
};
/** Issues pending SkSurface commands to the GPU-backed API and resolves any SkSurface MSAA.
The work that is submitted to the GPU will be dependent on the BackendSurfaceAccess that is
passed in.
If BackendSurfaceAccess::kNoAccess is passed in all commands will be issued to the GPU.
If BackendSurfaceAccess::kPresent is passed in and the backend API is not Vulkan, it is
treated the same as kNoAccess. If the backend API is Vulkan, the VkImage that backs the
SkSurface will be transferred back to its original queue. If the SkSurface was created by
wrapping a VkImage, the queue will be set to the queue which was originally passed in on
the GrVkImageInfo. Additionally, if the original queue was not external or foreign the
layout of the VkImage will be set to VK_IMAGE_LAYOUT_PRESENT_SRC_KHR.
The GrFlushInfo describes additional options to flush. Please see documentation at
GrFlushInfo for more info.
If the return is GrSemaphoresSubmitted::kYes, only initialized GrBackendSemaphores will
have been submitted and can be waited on (it is possible Skia failed to create a subset of
the semaphores). If this call returns GrSemaphoresSubmitted::kNo, the GPU backend will not
have submitted any semaphores to be signaled on the GPU. Thus the client should not have
the GPU wait on any of the semaphores passed in with the GrFlushInfo. Regardless of whether
semaphores were submitted to the GPU or not, the client is still responsible for deleting
any initialized semaphores.
Pending surface commands are flushed regardless of the return result.
@param access type of access the call will do on the backend object after flush
@param info flush options
*/
GrSemaphoresSubmitted flush(BackendSurfaceAccess access, const GrFlushInfo& info);
/** Deprecated
*/
GrSemaphoresSubmitted flush(BackendSurfaceAccess access, GrFlushFlags flags,
int numSemaphores, GrBackendSemaphore signalSemaphores[],
GrGpuFinishedProc finishedProc = nullptr,
GrGpuFinishedContext finishedContext = nullptr);
/** The below enum and flush call are deprecated
*/
enum FlushFlags {
kNone_FlushFlags = 0,
// flush will wait till all submitted GPU work is finished before returning.
kSyncCpu_FlushFlag = 0x1,
};
GrSemaphoresSubmitted flush(BackendSurfaceAccess access, FlushFlags flags,
int numSemaphores, GrBackendSemaphore signalSemaphores[]);
/** Deprecated.
*/
GrSemaphoresSubmitted flushAndSignalSemaphores(int numSemaphores,
GrBackendSemaphore signalSemaphores[]);
/** Inserts a list of GPU semaphores that the current GPU-backed API must wait on before
executing any more commands on the GPU for this surface. Skia will take ownership of the
underlying semaphores and delete them once they have been signaled and waited on.
If this call returns false, then the GPU back-end will not wait on any passed in semaphores,
and the client will still own the semaphores.
@param numSemaphores size of waitSemaphores array
@param waitSemaphores array of semaphore containers
@return true if GPU is waiting on semaphores
*/
bool wait(int numSemaphores, const GrBackendSemaphore* waitSemaphores);
/** Initializes SkSurfaceCharacterization that can be used to perform GPU back-end
processing in a separate thread. Typically this is used to divide drawing
into multiple tiles. SkDeferredDisplayListRecorder records the drawing commands
for each tile.
Return true if SkSurface supports characterization. raster surface returns false.
@param characterization properties for parallel drawing
@return true if supported
example: https://fiddle.skia.org/c/@Surface_characterize
*/
bool characterize(SkSurfaceCharacterization* characterization) const;
/** Draws deferred display list created using SkDeferredDisplayListRecorder.
Has no effect and returns false if SkSurfaceCharacterization stored in
deferredDisplayList is not compatible with SkSurface.
raster surface returns false.
@param deferredDisplayList drawing commands
@return false if deferredDisplayList is not compatible
example: https://fiddle.skia.org/c/@Surface_draw_2
*/
bool draw(SkDeferredDisplayList* deferredDisplayList);
protected:
SkSurface(int width, int height, const SkSurfaceProps* surfaceProps);
SkSurface(const SkImageInfo& imageInfo, const SkSurfaceProps* surfaceProps);
// called by subclass if their contents have changed
void dirtyGenerationID() {
fGenerationID = 0;
}
private:
const SkSurfaceProps fProps;
const int fWidth;
const int fHeight;
uint32_t fGenerationID;
typedef SkRefCnt INHERITED;
};
#endif
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