Remove SkGrPixelRef

src/gpu/SkGrPixelRef.cpp

-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-
-#include "SkGrPixelRef.h"
-
-#include "GrContext.h"
-#include "GrTexture.h"
-#include "GrTexturePriv.h"
-#include "SkBitmapCache.h"
-#include "SkGr.h"
-#include "SkRect.h"
-
-SkROLockPixelsPixelRef::SkROLockPixelsPixelRef(const SkImageInfo& info)
-    : INHERITED(info) {}
-
-SkROLockPixelsPixelRef::~SkROLockPixelsPixelRef() {}
-
-bool SkROLockPixelsPixelRef::onNewLockPixels(LockRec* rec) {
-    fBitmap.reset();
-//    SkDebugf("---------- calling readpixels in support of lockpixels\n");
-    if (!this->onReadPixels(&fBitmap, this->info().colorType(), nullptr)) {
-        SkDebugf("SkROLockPixelsPixelRef::onLockPixels failed!\n");
-        return false;
-    }
-    fBitmap.lockPixels();
-    if (nullptr == fBitmap.getPixels()) {
-        return false;
-    }
-
-    rec->fPixels = fBitmap.getPixels();
-    rec->fColorTable = nullptr;
-    rec->fRowBytes = fBitmap.rowBytes();
-    return true;
-}
-
-void SkROLockPixelsPixelRef::onUnlockPixels() {
-    fBitmap.unlockPixels();
-}
-
-bool SkROLockPixelsPixelRef::onLockPixelsAreWritable() const {
-    return false;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-static SkGrPixelRef* copy_to_new_texture_pixelref(GrTexture* texture, SkColorType dstCT,
-                                                  SkColorSpace* dstCS, const SkIRect* subset) {
-    if (nullptr == texture || kUnknown_SkColorType == dstCT) {
-        return nullptr;
-    }
-    GrContext* context = texture->getContext();
-    if (nullptr == context) {
-        return nullptr;
-    }
-    GrSurfaceDesc desc;
-
-    SkIRect srcRect;
-
-    if (!subset) {
-        desc.fWidth  = texture->width();
-        desc.fHeight = texture->height();
-        srcRect = SkIRect::MakeWH(texture->width(), texture->height());
-    } else {
-        SkASSERT(SkIRect::MakeWH(texture->width(), texture->height()).contains(*subset));
-        // Create a new texture that is the size of subset.
-        desc.fWidth = subset->width();
-        desc.fHeight = subset->height();
-        srcRect = *subset;
-    }
-    desc.fFlags = kRenderTarget_GrSurfaceFlag;
-    desc.fConfig = SkImageInfo2GrPixelConfig(dstCT, kPremul_SkAlphaType, dstCS, *context->caps());
-    desc.fIsMipMapped = false;
-
-    GrTexture* dst = context->textureProvider()->createTexture(desc, SkBudgeted::kNo, nullptr, 0);
-    if (nullptr == dst) {
-        return nullptr;
-    }
-
-    // Blink is relying on the above copy being sent to GL immediately in the case when the source
-    // is a WebGL canvas backing store. We could have a TODO to remove this flush, but we have
-    // a larger TODO to remove SkGrPixelRef entirely.
-    context->copySurface(dst, texture, srcRect, SkIPoint::Make(0,0));
-    context->flushSurfaceWrites(dst);
-
-    SkImageInfo info = SkImageInfo::Make(desc.fWidth, desc.fHeight, dstCT, kPremul_SkAlphaType,
-                                         sk_ref_sp(dstCS));
-    SkGrPixelRef* pixelRef = new SkGrPixelRef(info, dst);
-    SkSafeUnref(dst);
-    return pixelRef;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-SkGrPixelRef::SkGrPixelRef(const SkImageInfo& info, GrSurface* surface) : INHERITED(info) {
-    // For surfaces that are both textures and render targets, the texture owns the
-    // render target but not vice versa. So we ref the texture to keep both alive for
-    // the lifetime of this pixel ref.
-    fSurface = SkSafeRef(surface->asTexture());
-    if (nullptr == fSurface) {
-        fSurface = SkSafeRef(surface);
-    }
-
-    if (fSurface) {
-        SkASSERT(info.width() <= fSurface->width());
-        SkASSERT(info.height() <= fSurface->height());
-    }
-}
-
-SkGrPixelRef::~SkGrPixelRef() {
-    SkSafeUnref(fSurface);
-}
-
-GrTexture* SkGrPixelRef::getTexture() {
-    if (fSurface) {
-        return fSurface->asTexture();
-    }
-    return nullptr;
-}
-
-void SkGrPixelRef::onNotifyPixelsChanged() {
-    GrTexture* texture = this->getTexture();
-    if (texture) {
-        texture->texturePriv().dirtyMipMaps(true);
-    }
-}
-
-SkPixelRef* SkGrPixelRef::deepCopy(SkColorType dstCT, SkColorSpace* dstCS, const SkIRect* subset) {
-    if (nullptr == fSurface) {
-        return nullptr;
-    }
-
-    // Note that when copying a render-target-backed pixel ref, we
-    // return a texture-backed pixel ref instead.  This is because
-    // render-target pixel refs are usually created in conjunction with
-    // a GrTexture owned elsewhere (e.g., SkGpuDevice), and cannot live
-    // independently of that texture.  Texture-backed pixel refs, on the other
-    // hand, own their GrTextures, and are thus self-contained.
-    return copy_to_new_texture_pixelref(fSurface->asTexture(), dstCT, dstCS, subset);
-}
-
-static bool tryAllocBitmapPixels(SkBitmap* bitmap) {
-    SkBitmap::Allocator* allocator = SkBitmapCache::GetAllocator();
-    if (nullptr != allocator) {
-        return allocator->allocPixelRef(bitmap, 0);
-    } else {
-        // DiscardableMemory is not available, fallback to default allocator
-        return bitmap->tryAllocPixels();
-    }
-}
-
-bool SkGrPixelRef::onReadPixels(SkBitmap* dst, SkColorType colorType, const SkIRect* subset) {
-    if (nullptr == fSurface || fSurface->wasDestroyed()) {
-        return false;
-    }
-
-    GrPixelConfig config;
-    if (kRGBA_8888_SkColorType == colorType) {
-        config = kRGBA_8888_GrPixelConfig;
-    } else if (kBGRA_8888_SkColorType == colorType) {
-        config = kBGRA_8888_GrPixelConfig;
-    } else {
-        return false;
-    }
-
-    SkIRect bounds;
-    if (subset) {
-        bounds = *subset;
-    } else {
-        bounds = SkIRect::MakeWH(this->info().width(), this->info().height());
-    }
-
-    //Check the cache
-    if(!SkBitmapCache::Find(this->getGenerationID(), bounds, dst)) {
-        //Cache miss
-
-        SkBitmap cachedBitmap;
-        cachedBitmap.setInfo(SkImageInfo::Make(bounds.width(), bounds.height(), colorType,
-                                               this->info().alphaType(),
-                                               sk_ref_sp(this->info().colorSpace())));
-
-        // If we can't alloc the pixels, then fail
-        if (!tryAllocBitmapPixels(&cachedBitmap)) {
-            return false;
-        }
-
-        // Try to read the pixels from the surface
-        void* buffer = cachedBitmap.getPixels();
-        bool readPixelsOk = fSurface->readPixels(bounds.fLeft, bounds.fTop,
-                                bounds.width(), bounds.height(),
-                                config, buffer, cachedBitmap.rowBytes());
-
-        if (!readPixelsOk) {
-            return false;
-        }
-
-        // If we are here, pixels were read correctly from the surface.
-        cachedBitmap.setImmutable();
-        //Add to the cache
-        SkBitmapCache::Add(this, bounds, cachedBitmap);
-
-        dst->swap(cachedBitmap);
-    }
-
-    return true;
-
-}