SkSurface.h

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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/SkPixmap.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 GrBackendSurfaceMutableState;
class GrBackendTexture;
class GrDirectContext;
class GrRecordingContext;
class GrRenderTarget;
 
class SK_API SkSurface : public SkRefCnt {
public:
 
    static sk_sp<SkSurface> MakeRasterDirect(const SkImageInfo& imageInfo, void* pixels,
                                             size_t rowBytes,
                                             const SkSurfaceProps* surfaceProps = nullptr);
 
    static sk_sp<SkSurface> MakeRasterDirect(const SkPixmap& pm,
                                             const SkSurfaceProps* props = nullptr) {
        return MakeRasterDirect(pm.info(), pm.writable_addr(), pm.rowBytes(), props);
    }
 
    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);
 
    static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo, size_t rowBytes,
                                       const SkSurfaceProps* surfaceProps);
 
    static sk_sp<SkSurface> MakeRaster(const SkImageInfo& imageInfo,
                                       const SkSurfaceProps* props = nullptr) {
        return MakeRaster(imageInfo, 0, props);
    }
 
    static sk_sp<SkSurface> MakeRasterN32Premul(int width, int height,
                                                const SkSurfaceProps* surfaceProps = nullptr);
 
    typedef void* ReleaseContext;
 
    typedef void (*RenderTargetReleaseProc)(ReleaseContext releaseContext);
 
    typedef void (*TextureReleaseProc)(ReleaseContext releaseContext);
 
    static sk_sp<SkSurface> MakeFromBackendTexture(GrRecordingContext* context,
                                                   const GrBackendTexture& backendTexture,
                                                   GrSurfaceOrigin origin, int sampleCnt,
                                                   SkColorType colorType,
                                                   sk_sp<SkColorSpace> colorSpace,
                                                   const SkSurfaceProps* surfaceProps,
                                                   TextureReleaseProc textureReleaseProc = nullptr,
                                                   ReleaseContext releaseContext = nullptr);
 
    static sk_sp<SkSurface> MakeFromBackendRenderTarget(GrRecordingContext* context,
                                                const GrBackendRenderTarget& backendRenderTarget,
                                                GrSurfaceOrigin origin,
                                                SkColorType colorType,
                                                sk_sp<SkColorSpace> colorSpace,
                                                const SkSurfaceProps* surfaceProps,
                                                RenderTargetReleaseProc releaseProc = nullptr,
                                                ReleaseContext releaseContext = nullptr);
 
#if defined(SK_BUILD_FOR_ANDROID) && __ANDROID_API__ >= 26
 
    static sk_sp<SkSurface> MakeFromAHardwareBuffer(GrDirectContext* context,
                                                    AHardwareBuffer* hardwareBuffer,
                                                    GrSurfaceOrigin origin,
                                                    sk_sp<SkColorSpace> colorSpace,
                                                    const SkSurfaceProps* surfaceProps);
#endif
 
#ifdef SK_METAL
 
    static sk_sp<SkSurface> MakeFromCAMetalLayer(GrRecordingContext* context,
                                                 GrMTLHandle layer,
                                                 GrSurfaceOrigin origin,
                                                 int sampleCnt,
                                                 SkColorType colorType,
                                                 sk_sp<SkColorSpace> colorSpace,
                                                 const SkSurfaceProps* surfaceProps,
                                                 GrMTLHandle* drawable)
                                                 SK_API_AVAILABLE_CA_METAL_LAYER;
 
    static sk_sp<SkSurface> MakeFromMTKView(GrRecordingContext* 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
 
    static sk_sp<SkSurface> MakeRenderTarget(GrRecordingContext* context, SkBudgeted budgeted,
                                             const SkImageInfo& imageInfo,
                                             int sampleCount, GrSurfaceOrigin surfaceOrigin,
                                             const SkSurfaceProps* surfaceProps,
                                             bool shouldCreateWithMips = false);
 
    static sk_sp<SkSurface> MakeRenderTarget(GrRecordingContext* context, SkBudgeted budgeted,
                                             const SkImageInfo& imageInfo, int sampleCount,
                                             const SkSurfaceProps* surfaceProps) {
        return MakeRenderTarget(context, budgeted, imageInfo, sampleCount,
                                kBottomLeft_GrSurfaceOrigin, surfaceProps);
    }
 
    static sk_sp<SkSurface> MakeRenderTarget(GrRecordingContext* context, SkBudgeted budgeted,
                                             const SkImageInfo& imageInfo) {
        if (!imageInfo.width() || !imageInfo.height()) {
            return nullptr;
        }
        return MakeRenderTarget(context, budgeted, imageInfo, 0, kBottomLeft_GrSurfaceOrigin,
                                nullptr);
    }
 
    static sk_sp<SkSurface> MakeRenderTarget(GrRecordingContext* context,
                                             const SkSurfaceCharacterization& characterization,
                                             SkBudgeted budgeted);
 
    bool isCompatible(const SkSurfaceCharacterization& characterization) const;
 
    static sk_sp<SkSurface> MakeNull(int width, int height);
 
    int width() const { return fWidth; }
 
    int height() const { return fHeight; }
 
    SkImageInfo imageInfo();
 
    uint32_t generationID();
 
    enum ContentChangeMode {
        kDiscard_ContentChangeMode, 
        kRetain_ContentChangeMode,  
    };
 
    void notifyContentWillChange(ContentChangeMode mode);
 
    GrRecordingContext* recordingContext();
 
    enum BackendHandleAccess {
        kFlushRead_BackendHandleAccess,    
        kFlushWrite_BackendHandleAccess,   
        kDiscardWrite_BackendHandleAccess, 
    };
 
    static const BackendHandleAccess kFlushRead_TextureHandleAccess =
            kFlushRead_BackendHandleAccess;
 
    static const BackendHandleAccess kFlushWrite_TextureHandleAccess =
            kFlushWrite_BackendHandleAccess;
 
    static const BackendHandleAccess kDiscardWrite_TextureHandleAccess =
            kDiscardWrite_BackendHandleAccess;
 
    GrBackendTexture getBackendTexture(BackendHandleAccess backendHandleAccess);
 
    GrBackendRenderTarget getBackendRenderTarget(BackendHandleAccess backendHandleAccess);
 
    bool replaceBackendTexture(const GrBackendTexture& backendTexture,
                               GrSurfaceOrigin origin,
                               ContentChangeMode mode = kRetain_ContentChangeMode,
                               TextureReleaseProc textureReleaseProc = nullptr,
                               ReleaseContext releaseContext = nullptr);
 
    SkCanvas* getCanvas();
 
    sk_sp<SkSurface> makeSurface(const SkImageInfo& imageInfo);
 
    sk_sp<SkSurface> makeSurface(int width, int height);
 
    sk_sp<SkImage> makeImageSnapshot();
 
    sk_sp<SkImage> makeImageSnapshot(const SkIRect& bounds);
 
    void draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkSamplingOptions& sampling,
              const SkPaint* paint);
    void draw(SkCanvas* canvas, SkScalar x, SkScalar y) {
        this->draw(canvas, x, y, SkSamplingOptions(), nullptr);
    }
 
    // DEPRECATED -- use explicit sampling options
    void draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint);
 
    bool peekPixels(SkPixmap* pixmap);
 
    bool readPixels(const SkPixmap& dst, int srcX, int srcY);
 
    bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
                    int srcX, int srcY);
 
    bool readPixels(const SkBitmap& dst, int srcX, int srcY);
 
    using AsyncReadResult = SkImage::AsyncReadResult;
 
    using ReadPixelsContext = void*;
 
    using ReadPixelsCallback = void(ReadPixelsContext, std::unique_ptr<const AsyncReadResult>);
 
    using RescaleGamma = SkImage::RescaleGamma;
    using RescaleMode  = SkImage::RescaleMode;
 
    void asyncRescaleAndReadPixels(const SkImageInfo& info,
                                   const SkIRect& srcRect,
                                   RescaleGamma rescaleGamma,
                                   RescaleMode rescaleMode,
                                   ReadPixelsCallback callback,
                                   ReadPixelsContext context);
 
    void asyncRescaleAndReadPixelsYUV420(SkYUVColorSpace yuvColorSpace,
                                         sk_sp<SkColorSpace> dstColorSpace,
                                         const SkIRect& srcRect,
                                         const SkISize& dstSize,
                                         RescaleGamma rescaleGamma,
                                         RescaleMode rescaleMode,
                                         ReadPixelsCallback callback,
                                         ReadPixelsContext context);
 
    void writePixels(const SkPixmap& src, int dstX, int dstY);
 
    void writePixels(const SkBitmap& src, int dstX, int dstY);
 
    const SkSurfaceProps& props() const { return fProps; }
 
    void flushAndSubmit(bool syncCpu = false);
 
    enum class BackendSurfaceAccess {
        kNoAccess,  
        kPresent,   
    };
 
    GrSemaphoresSubmitted flush(BackendSurfaceAccess access, const GrFlushInfo& info);
 
    GrSemaphoresSubmitted flush(const GrFlushInfo& info,
                                const GrBackendSurfaceMutableState* newState = nullptr);
 
    void flush() { this->flush({}); }
 
    bool wait(int numSemaphores, const GrBackendSemaphore* waitSemaphores,
              bool deleteSemaphoresAfterWait = true);
 
    bool characterize(SkSurfaceCharacterization* characterization) const;
 
    bool draw(sk_sp<const SkDeferredDisplayList> deferredDisplayList,
              int xOffset = 0,
              int yOffset = 0);
 
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;
 
    using INHERITED = SkRefCnt;
};
 
#endif