/*
* 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 "SkRefCnt.h"
#include "SkImage.h"
#include "SkSurfaceProps.h"
#include "GrTypes.h"
class SkCanvas;
class SkDeferredDisplayList;
class SkPaint;
class SkSurfaceCharacterization;
class GrBackendRenderTarget;
class GrBackendSemaphore;
class GrContext;
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, 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 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 not zero, subsequent images returned by makeImageSnapshot()
have the same rowBytes.
@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 SkColorType, 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) {
return MakeRaster(SkImageInfo::MakeN32Premul(width, height), surfaceProps);
}
/** 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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors
@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> MakeFromBackendTexture(GrContext* context,
const GrBackendTexture& backendTexture,
GrSurfaceOrigin origin, int sampleCnt,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
/** 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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorType one of: kUnknown_SkColorType, kAlpha_8_SkColorType,
kRGB_565_SkColorType, kARGB_4444_SkColorType,
kRGBA_8888_SkColorType, kBGRA_8888_SkColorType,
kGray_8_SkColorType, kRGBA_F16_SkColorType
@param colorSpace range of colors
@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> MakeFromBackendTexture(GrContext* context,
const GrBackendTexture& backendTexture,
GrSurfaceOrigin origin, int sampleCnt,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
/** Wraps a GPU-backed buffer into SkSurface. Caller must ensure render target 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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param colorSpace range of colors
@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> MakeFromBackendRenderTarget(GrContext* context,
const GrBackendRenderTarget& backendRenderTarget,
GrSurfaceOrigin origin,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
/** Wraps a GPU-backed buffer into SkSurface. Caller must ensure render target 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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param colorType one of: kUnknown_SkColorType, kAlpha_8_SkColorType,
kRGB_565_SkColorType, kARGB_4444_SkColorType,
kRGBA_8888_SkColorType, kBGRA_8888_SkColorType,
kGray_8_SkColorType, kRGBA_F16_SkColorType
@param colorSpace range of colors
@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> MakeFromBackendRenderTarget(GrContext* context,
const GrBackendRenderTarget& backendRenderTarget,
GrSurfaceOrigin origin,
SkColorType colorType,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
/** Used to wrap a GPU-backed texture as a SkSurface. Skia will treat the texture as
a rendering target only, but unlike NewFromBackendRenderTarget, Skia will manage and own
the associated render target objects (but not the provided texture). Skia will not assume
ownership of the texture and the client must ensure the texture is valid for the lifetime
of the SkSurface.
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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorSpace range of colors
@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,
sk_sp<SkColorSpace> colorSpace,
const SkSurfaceProps* surfaceProps);
/** Used to wrap a GPU-backed texture as a SkSurface. Skia will treat the texture as
a rendering target only, but unlike NewFromBackendRenderTarget, Skia will manage and own
the associated render target objects (but not the provided texture). Skia will not assume
ownership of the texture and the client must ensure the texture is valid for the lifetime
of the SkSurface.
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 origin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@param sampleCnt samples per pixel, or 0 to disable full scene anti-aliasing
@param colorType one of: kUnknown_SkColorType, kAlpha_8_SkColorType,
kRGB_565_SkColorType, kARGB_4444_SkColorType,
kRGBA_8888_SkColorType, kBGRA_8888_SkColorType,
kGray_8_SkColorType, kRGBA_F16_SkColorType
@param colorSpace range of colors
@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);
/** Returns SkSurface on GPU indicated by context. Allocates memory for
pixels, based on the width, height, and SkColorType in ImageInfo. 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 budgeted one of: SkBudgeted::kNo, SkBudgeted::kYes
@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 surfaceOrigin one of: kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin
@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 ImageInfo. 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 budgeted one of: SkBudgeted::kNo, SkBudgeted::kYes
@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 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> MakeRenderTarget(GrContext* context, SkBudgeted budgeted,
const SkImageInfo& imageInfo, int sampleCount,
const SkSurfaceProps* props) {
return MakeRenderTarget(context, budgeted, imageInfo, sampleCount,
kBottomLeft_GrSurfaceOrigin, props);
}
/** Returns SkSurface on GPU indicated by context. Allocates memory for
pixels, based on the width, height, and SkColorType in ImageInfo. 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 budgeted one of: SkBudgeted::kNo, SkBudgeted::kYes
@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 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
*/
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 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
*/
uint32_t generationID();
/** \enum SkSurface::ContentChangeMode
ContentChangeMode members are parameters to notifyContentWillChange().
*/
enum ContentChangeMode {
kDiscard_ContentChangeMode, //!< the surface is cleared or overwritten.
/** If a snapshot has been generated, this copies the SkSurface contents. */
kRetain_ContentChangeMode,
};
/** Notifies that SkSurface contents will be changed by code outside of Skia.
Subsequent calls to generationID() return a different value.
mode is normally passed as kRetain_ContentChangeMode.
CAN WE DEPRECATE THIS?
@param mode one of: kDiscard_ContentChangeMode, kRetain_ContentChangeMode
*/
void notifyContentWillChange(ContentChangeMode mode);
enum BackendHandleAccess {
kFlushRead_BackendHandleAccess, //!< Caller may read from the back-end object.
kFlushWrite_BackendHandleAccess, //!< Caller may write to the back-end object.
kDiscardWrite_BackendHandleAccess, //!< Caller must overwrite the entire back-end object.
};
/** Deprecated.
*/
static const BackendHandleAccess kFlushRead_TextureHandleAccess =
kFlushRead_BackendHandleAccess;
/** Deprecated.
*/
static const BackendHandleAccess kFlushWrite_TextureHandleAccess =
kFlushWrite_BackendHandleAccess;
/** Deprecated.
*/
static const BackendHandleAccess kDiscardWrite_TextureHandleAccess =
kDiscardWrite_BackendHandleAccess;
/** Returns the GPU back-end reference of the texture used by SkSurface, or zero
if SkSurface is not backed by a GPU texture.
The returned texture handle is only valid until the next draw into SkSurface,
or when SkSurface is deleted.
@param backendHandleAccess one of: kFlushRead_BackendHandleAccess,
kFlushWrite_BackendHandleAccess, kDiscardWrite_BackendHandleAccess
@return GPU texture reference
*/
GrBackendObject getTextureHandle(BackendHandleAccess backendHandleAccess);
/** Returns true and stores the GPU back-end reference of the render target used
by SkSurface in backendObject.
Return false if SkSurface is not backed by a GPU render target, and leaves
backendObject unchanged.
The returned render target handle is only valid until the next draw into SkSurface,
or when SkSurface is deleted.
In OpenGL this returns the frame buffer object ID.
@param backendObject GPU intermediate memory buffer
@param backendHandleAccess one of: kFlushRead_BackendHandleAccess,
kFlushWrite_BackendHandleAccess, kDiscardWrite_BackendHandleAccess
@return true if SkSurface is backed by GPU texture
*/
bool getRenderTargetHandle(GrBackendObject* backendObject,
BackendHandleAccess backendHandleAccess);
/** 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
*/
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
*/
sk_sp<SkSurface> makeSurface(const SkImageInfo& imageInfo);
/** 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
*/
sk_sp<SkImage> makeImageSnapshot();
/** Draws SkSurface contents to canvas, with its top-left corner at (x, y).
If SkPaint paint is not nullptr, apply SkColorFilter, color 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
*/
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
*/
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 in x; may be negative
@param srcY offset into readable pixels in y; may be negative
@return true if pixels were copied
*/
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 in x; may be negative
@param srcY offset into readable pixels in y; 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 in x; may be negative
@param srcY offset into readable pixels in y; may be negative
@return true if pixels were copied
*/
bool readPixels(const SkBitmap& dst, int srcX, int srcY);
/** 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 position relative to SkSurface to begin copy; may be negative
@param dstY x position relative to SkSurface to begin copy; may be negative
*/
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 position relative to SkSurface to begin copy; may be negative
@param dstY x position relative to SkSurface to begin copy; may be negative
*/
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; }
/** To be deprecated soon.
*/
void prepareForExternalIO();
/** 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();
/** Issues pending SkSurface commands to the GPU-backed API and resolves any SkSurface MSAA.
After issuing all commands, signalSemaphores of count numSemaphores semaphores
are signaled by the GPU.
For each GrBackendSemaphore in signalSemaphores:
if GrBackendSemaphore is initialized, the GPU back-end uses the semaphore as is;
otherwise, a new semaphore is created and initializes GrBackendSemaphore.
The caller must delete the semaphores created and returned in signalSemaphores.
GrBackendSemaphore can be deleted as soon as this function returns.
If the back-end API is OpenGL only uninitialized backend semaphores are supported.
If the back-end API is Vulkan semaphores may be initialized or uninitialized.
If uninitialized, created semaphores are valid only with the VkDevice
with which they were created.
If GrSemaphoresSubmitted::kNo is returned, the GPU back-end did not create or
add any semaphores to signal on the GPU; the caller should not instruct the GPU
to wait on any of the semaphores.
Pending surface commands are flushed regardless of the return result.
@param numSemaphores size of signalSemaphores array
@param signalSemaphores array of semaphore containers
@return one of: GrSemaphoresSubmitted::kYes, GrSemaphoresSubmitted::kNo
*/
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. DeferredDisplayListRecorder 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
*/
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
*/
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