C++ SkBitmap::getGenerationID方法代码示例

DEF_TEST(SpecialImage_BitmapDevice, reporter) {
    static const int kWidth = 100;
    static const int kHeight = 90;

    SkImageInfo ii = SkImageInfo::MakeN32Premul(2*kWidth, 2*kHeight);

    sk_sp<SkBaseDevice> bmDev(SkBitmapDevice::Create(ii));

    SkBitmap bm;
    bm.tryAllocN32Pixels(kWidth, kHeight);

    // Create a raster-backed special image from a raster-backed SkBitmap
    sk_sp<SkSpecialImage> special = DeviceTestingAccess::MakeSpecial(bmDev.get(), bm);
    SkASSERT(!special->isTextureBacked());
    SkASSERT(kWidth == special->width());
    SkASSERT(kHeight == special->height());
    SkASSERT(bm.getGenerationID() == special->uniqueID());
    SkASSERT(SkIRect::MakeWH(kWidth, kHeight) == special->subset());

    // Create a raster-backed special image from a raster-backed SkImage
    sk_sp<SkImage> image(SkImage::MakeFromBitmap(bm));
    special = DeviceTestingAccess::MakeSpecial(bmDev.get(), image.get());
    SkASSERT(!special->isTextureBacked());
    SkASSERT(kWidth == special->width());
    SkASSERT(kHeight == special->height());
    SkASSERT(bm.getGenerationID() == special->uniqueID());
    SkASSERT(SkIRect::MakeWH(kWidth, kHeight) == special->subset());

    // Snap the device as a raster-backed special image
    special = DeviceTestingAccess::SnapSpecial(bmDev.get());
    SkASSERT(!special->isTextureBacked());
    SkASSERT(2*kWidth == special->width());
    SkASSERT(2*kHeight == special->height());
    SkASSERT(SkIRect::MakeWH(2*kWidth, 2*kHeight) == special->subset());
}

static void testBitmapCache_discarded_bitmap(skiatest::Reporter* reporter, SkResourceCache* cache,
                                             SkResourceCache::DiscardableFactory factory) {
    SkBitmap::Allocator* allocator = cache->allocator();
    const SkColorType testTypes[] = {
        kAlpha_8_SkColorType,
        kRGB_565_SkColorType,
        kRGBA_8888_SkColorType,
        kBGRA_8888_SkColorType,
        kIndex_8_SkColorType,
        kGray_8_SkColorType
    };
    for (const SkColorType testType : testTypes) {
        SkBitmap cachedBitmap;
        make_bitmap(&cachedBitmap, SkImageInfo::Make(5, 5, testType, kPremul_SkAlphaType),
                    allocator);
        cachedBitmap.setImmutable();
        cachedBitmap.unlockPixels();

        SkBitmap bm;
        SkIRect rect = SkIRect::MakeWH(5, 5);

        // Add a bitmap to the cache.
        REPORTER_ASSERT(reporter, SkBitmapCache::Add(cachedBitmap.pixelRef(), rect, cachedBitmap,
                                                     cache));
        REPORTER_ASSERT(reporter, SkBitmapCache::Find(cachedBitmap.getGenerationID(), rect, &bm,
                                                      cache));

        // Finding more than once works fine.
        REPORTER_ASSERT(reporter, SkBitmapCache::Find(cachedBitmap.getGenerationID(), rect, &bm,
                                                      cache));
        bm.unlockPixels();

        // Drop the pixels in the bitmap.
        if (factory) {
            REPORTER_ASSERT(reporter, gPool->getRAMUsed() > 0);
            gPool->dumpPool();

            // The bitmap is not in the cache since it has been dropped.
            REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedBitmap.getGenerationID(), rect,
                                                           &bm, cache));
        }

        make_bitmap(&cachedBitmap, SkImageInfo::Make(5, 5, testType, kPremul_SkAlphaType),
                    allocator);
        cachedBitmap.setImmutable();
        cachedBitmap.unlockPixels();

        // We can add the bitmap back to the cache and find it again.
        REPORTER_ASSERT(reporter, SkBitmapCache::Add(cachedBitmap.pixelRef(), rect, cachedBitmap,
                                                     cache));
        REPORTER_ASSERT(reporter, SkBitmapCache::Find(cachedBitmap.getGenerationID(), rect, &bm,
                                                      cache));
    }
    test_mipmapcache(reporter, cache);
    test_bitmap_notify(reporter, cache);
    test_mipmap_notify(reporter, cache);
}

DEF_TEST(BitmapCopy_extractSubset, reporter) {
    for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
        SkBitmap srcOpaque, srcPremul;
        setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fColorType);

        SkBitmap bitmap(srcOpaque);
        SkBitmap subset;
        SkIRect r;
        // Extract a subset which has the same width as the original. This
        // catches a bug where we cloned the genID incorrectly.
        r.set(0, 1, W, 3);
        bitmap.setIsVolatile(true);
        // Relies on old behavior of extractSubset failing if colortype is unknown
        if (kUnknown_SkColorType != bitmap.colorType() && bitmap.extractSubset(&subset, r)) {
            REPORTER_ASSERT(reporter, subset.width() == W);
            REPORTER_ASSERT(reporter, subset.height() == 2);
            REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
            REPORTER_ASSERT(reporter, subset.isVolatile() == true);

            // Test copying an extracted subset.
            for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
                SkBitmap copy;
                bool success = subset.copyTo(&copy, gPairs[j].fColorType);
                if (!success) {
                    // Skip checking that success matches fValid, which is redundant
                    // with the code below.
                    REPORTER_ASSERT(reporter, gPairs[i].fColorType != gPairs[j].fColorType);
                    continue;
                }

                // When performing a copy of an extracted subset, the gen id should
                // change.
                REPORTER_ASSERT(reporter, copy.getGenerationID() != subset.getGenerationID());

                REPORTER_ASSERT(reporter, copy.width() == W);
                REPORTER_ASSERT(reporter, copy.height() == 2);

                if (gPairs[i].fColorType == gPairs[j].fColorType) {
                    SkAutoLockPixels alp0(subset);
                    SkAutoLockPixels alp1(copy);
                    // they should both have, or both not-have, a colortable
                    bool hasCT = subset.getColorTable() != nullptr;
                    REPORTER_ASSERT(reporter, (copy.getColorTable() != nullptr) == hasCT);
                }
            }
        }

        bitmap = srcPremul;
        bitmap.setIsVolatile(false);
        if (bitmap.extractSubset(&subset, r)) {
            REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
            REPORTER_ASSERT(reporter, subset.isVolatile() == false);
        }
    }
}

/**
 *  Check to ensure that copying a GPU-backed SkBitmap behaved as expected.
 *  @param reporter Used to report failures.
 *  @param desiredConfig Config being copied to. If the copy succeeded, dst must have this Config.
 *  @param success True if the copy succeeded.
 *  @param src A GPU-backed SkBitmap that had copyTo or deepCopyTo called on it.
 *  @param dst SkBitmap that was copied to.
 *  @param deepCopy True if deepCopyTo was used; false if copyTo was used.
 */
static void TestIndividualCopy(skiatest::Reporter* reporter, const SkBitmap::Config desiredConfig,
                               const bool success, const SkBitmap& src, const SkBitmap& dst,
                               const bool deepCopy = true) {
    if (success) {
        REPORTER_ASSERT(reporter, src.width() == dst.width());
        REPORTER_ASSERT(reporter, src.height() == dst.height());
        REPORTER_ASSERT(reporter, dst.config() == desiredConfig);
        if (src.config() == dst.config()) {
            // FIXME: When calling copyTo (so deepCopy is false here), sometimes we copy the pixels
            // exactly, in which case the IDs should be the same, but sometimes we do a bitmap draw,
            // in which case the IDs should not be the same. Is there any way to determine which is
            // the case at this point?
            if (deepCopy) {
                REPORTER_ASSERT(reporter, src.getGenerationID() == dst.getGenerationID());
            }
            REPORTER_ASSERT(reporter, src.pixelRef() != NULL && dst.pixelRef() != NULL);

            // Do read backs and make sure that the two are the same.
            SkBitmap srcReadBack, dstReadBack;
            {
                SkASSERT(src.getTexture() != NULL);
                bool readBack = src.pixelRef()->readPixels(&srcReadBack);
                REPORTER_ASSERT(reporter, readBack);
            }
            if (dst.getTexture() != NULL) {
                bool readBack = dst.pixelRef()->readPixels(&dstReadBack);
                REPORTER_ASSERT(reporter, readBack);
            } else {
                // If dst is not a texture, do a copy instead, to the same config as srcReadBack.
                bool copy = dst.copyTo(&dstReadBack, srcReadBack.config());
                REPORTER_ASSERT(reporter, copy);
            }

            SkAutoLockPixels srcLock(srcReadBack);
            SkAutoLockPixels dstLock(dstReadBack);
            REPORTER_ASSERT(reporter, srcReadBack.readyToDraw() && dstReadBack.readyToDraw());

            const char* srcP = static_cast<const char*>(srcReadBack.getAddr(0, 0));
            const char* dstP = static_cast<const char*>(dstReadBack.getAddr(0, 0));
            REPORTER_ASSERT(reporter, srcP != dstP);

            REPORTER_ASSERT(reporter, !memcmp(srcP, dstP, srcReadBack.getSize()));
        } else {
            REPORTER_ASSERT(reporter, src.getGenerationID() != dst.getGenerationID());
        }
    } else {
        // dst should be unchanged from its initial state
        REPORTER_ASSERT(reporter, dst.config() == SkBitmap::kNo_Config);
        REPORTER_ASSERT(reporter, dst.width() == 0);
        REPORTER_ASSERT(reporter, dst.height() == 0);
    }

}

// https://bug.skia.org/2894
DEF_TEST(BitmapCache_add_rect, reporter) {
    SkResourceCache::DiscardableFactory factory = SkResourceCache::GetDiscardableFactory();
    SkBitmap::Allocator* allocator = SkBitmapCache::GetAllocator();

    SkAutoTDelete<SkResourceCache> cache;
    if (factory) {
        cache.reset(new SkResourceCache(factory));
    } else {
        const size_t byteLimit = 100 * 1024;
        cache.reset(new SkResourceCache(byteLimit));
    }
    SkBitmap cachedBitmap;
    make_bitmap(&cachedBitmap, SkImageInfo::MakeN32Premul(5, 5), allocator);
    cachedBitmap.setImmutable();

    SkBitmap bm;
    SkIRect rect = SkIRect::MakeWH(5, 5);
    uint32_t cachedID = cachedBitmap.getGenerationID();
    SkPixelRef* cachedPR = cachedBitmap.pixelRef();

    // Wrong subset size
    REPORTER_ASSERT(reporter, !SkBitmapCache::Add(cachedPR, SkIRect::MakeWH(4, 6), cachedBitmap, cache));
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));
    // Wrong offset value
    REPORTER_ASSERT(reporter, !SkBitmapCache::Add(cachedPR, SkIRect::MakeXYWH(-1, 0, 5, 5), cachedBitmap, cache));
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));

    // Should not be in the cache
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));

    REPORTER_ASSERT(reporter, SkBitmapCache::Add(cachedPR, rect, cachedBitmap, cache));
    // Should be in the cache, we just added it
    REPORTER_ASSERT(reporter, SkBitmapCache::Find(cachedID, rect, &bm, cache));
}

/*
 *  This tests the caching (and preemptive purge) of the raster equivalent of a gpu-image.
 *  We cache it for performance when drawing into a raster surface.
 *
 *  A cleaner test would know if each drawImage call triggered a read-back from the gpu,
 *  but we don't have that facility (at the moment) so we use a little internal knowledge
 *  of *how* the raster version is cached, and look for that.
 */
DEF_GPUTEST_FOR_NATIVE_CONTEXT(SkImage_Gpu2Cpu, reporter, context) {
    SkImageInfo info = SkImageInfo::MakeN32(20, 20, kOpaque_SkAlphaType);
    SkAutoTUnref<SkImage> image(create_gpu_image(context));
    const uint32_t uniqueID = image->uniqueID();

    SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info));

    // now we can test drawing a gpu-backed image into a cpu-backed surface

    {
        SkBitmap cachedBitmap;
        REPORTER_ASSERT(reporter, !SkBitmapCache::Find(uniqueID, &cachedBitmap));
    }

    surface->getCanvas()->drawImage(image, 0, 0);
    {
        SkBitmap cachedBitmap;
        if (SkBitmapCache::Find(uniqueID, &cachedBitmap)) {
            REPORTER_ASSERT(reporter, cachedBitmap.getGenerationID() == uniqueID);
            REPORTER_ASSERT(reporter, cachedBitmap.isImmutable());
            REPORTER_ASSERT(reporter, cachedBitmap.getPixels());
        } else {
            // unexpected, but not really a bug, since the cache is global and this test may be
            // run w/ other threads competing for its budget.
            SkDebugf("SkImage_Gpu2Cpu : cachedBitmap was already purged\n");
        }
    }

    image.reset(nullptr);
    {
        SkBitmap cachedBitmap;
        REPORTER_ASSERT(reporter, !SkBitmapCache::Find(uniqueID, &cachedBitmap));
    }
}

 SkSpecialImage_Raster(const SkIRect& subset, const SkBitmap& bm, const SkSurfaceProps* props)
     : INHERITED(subset, bm.getGenerationID(), props)
     , fBitmap(bm)
 {
     SkASSERT(bm.pixelRef());
     SkASSERT(fBitmap.getPixels());
 }

bool SkImageFilter::filterImage(Proxy* proxy, const SkBitmap& src,
                                const Context& context,
                                SkBitmap* result, SkIPoint* offset) const {
    SkASSERT(result);
    SkASSERT(offset);
    uint32_t srcGenID = fUsesSrcInput ? src.getGenerationID() : 0;
    Cache::Key key(fUniqueID, context.ctm(), context.clipBounds(), srcGenID);
    if (context.cache()) {
        if (context.cache()->get(key, result, offset)) {
            return true;
        }
    }
    /*
     *  Give the proxy first shot at the filter. If it returns false, ask
     *  the filter to do it.
     */
    if ((proxy && proxy->filterImage(this, src, context, result, offset)) ||
        this->onFilterImage(proxy, src, context, result, offset)) {
        if (context.cache()) {
            context.cache()->set(key, *result, *offset);
        }
        return true;
    }
    return false;
}

sk_sp<SkImage> SkImage::MakeFromBitmap(const SkBitmap& bm) {
    SkPixelRef* pr = bm.pixelRef();
    if (nullptr == pr) {
        return nullptr;
    }

#if SK_SUPPORT_GPU
    if (GrTexture* tex = pr->getTexture()) {
        SkAutoTUnref<GrTexture> unrefCopy;
        if (!bm.isImmutable()) {
            tex = GrDeepCopyTexture(tex, SkBudgeted::kNo);
            if (nullptr == tex) {
                return nullptr;
            }
            unrefCopy.reset(tex);
        }
        const SkImageInfo info = bm.info();
        return sk_make_sp<SkImage_Gpu>(info.width(), info.height(), bm.getGenerationID(),
                                       info.alphaType(), tex, sk_ref_sp(info.colorSpace()),
                                       SkBudgeted::kNo);
    }
#endif

    // This will check for immutable (share or copy)
    return SkMakeImageFromRasterBitmap(bm);
}

DEF_TEST(image_newfrombitmap, reporter) {
    const struct {
        void (*fMakeProc)(SkBitmap*);
        bool fExpectPeekSuccess;
        bool fExpectSharedID;
        bool fExpectLazy;
    } rec[] = {
        { make_bitmap_mutable,      true,   false, false },
        { make_bitmap_immutable,    true,   true,  false },
    };

    for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
        SkBitmap bm;
        rec[i].fMakeProc(&bm);

        SkAutoTUnref<SkImage> image(SkImage::NewFromBitmap(bm));
        SkPixmap pmap;

        const bool sharedID = (image->uniqueID() == bm.getGenerationID());
        REPORTER_ASSERT(reporter, sharedID == rec[i].fExpectSharedID);

        const bool peekSuccess = image->peekPixels(&pmap);
        REPORTER_ASSERT(reporter, peekSuccess == rec[i].fExpectPeekSuccess);

        const bool lazy = image->isLazyGenerated();
        REPORTER_ASSERT(reporter, lazy == rec[i].fExpectLazy);
    }
}

void Image::drawPattern(GraphicsContext* context, const FloatRect& floatSrcRect, const FloatSize& scale,
    const FloatPoint& phase, SkXfermode::Mode compositeOp, const FloatRect& destRect, const IntSize& repeatSpacing)
{
    TRACE_EVENT0("skia", "Image::drawPattern");
    SkBitmap bitmap;
    if (!bitmapForCurrentFrame(&bitmap))
        return;

    FloatRect normSrcRect = floatSrcRect;

    normSrcRect.intersect(FloatRect(0, 0, bitmap.width(), bitmap.height()));
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return; // nothing to draw

    SkMatrix localMatrix;
    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the pattern. If WebKit wants
    // a shifted image, it will shift it from there using the localMatrix.
    const float adjustedX = phase.x() + normSrcRect.x() * scale.width();
    const float adjustedY = phase.y() + normSrcRect.y() * scale.height();
    localMatrix.setTranslate(SkFloatToScalar(adjustedX), SkFloatToScalar(adjustedY));

    // Because no resizing occurred, the shader transform should be
    // set to the pattern's transform, which just includes scale.
    localMatrix.preScale(scale.width(), scale.height());

    SkBitmap bitmapToPaint;
    bitmap.extractSubset(&bitmapToPaint, enclosingIntRect(normSrcRect));
    if (!repeatSpacing.isZero()) {
        SkScalar ctmScaleX = 1.0;
        SkScalar ctmScaleY = 1.0;

        if (!RuntimeEnabledFeatures::slimmingPaintEnabled()) {
            AffineTransform ctm = context->getCTM();
            ctmScaleX = ctm.xScale();
            ctmScaleY = ctm.yScale();
        }

        bitmapToPaint = createBitmapWithSpace(
            bitmapToPaint,
            repeatSpacing.width() * ctmScaleX / scale.width(),
            repeatSpacing.height() * ctmScaleY / scale.height());
    }
    RefPtr<SkShader> shader = adoptRef(SkShader::CreateBitmapShader(bitmapToPaint, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));

    bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap);
    {
        SkPaint paint;
        int initialSaveCount = context->preparePaintForDrawRectToRect(&paint, floatSrcRect,
            destRect, compositeOp, !bitmap.isOpaque(), isLazyDecoded, bitmap.isImmutable());
        paint.setShader(shader.get());
        context->drawRect(destRect, paint);
        context->canvas()->restoreToCount(initialSaveCount);
    }

    if (isLazyDecoded)
        PlatformInstrumentation::didDrawLazyPixelRef(bitmap.getGenerationID());
}

 SkImage_Raster(const SkBitmap& bm, bool bitmapMayBeMutable = false)
     : INHERITED(bm.width(), bm.height(),
                 is_not_subset(bm) ? bm.getGenerationID()
                                   : (uint32_t)kNeedNewImageUniqueID)
     , fBitmap(bm)
 {
     SkASSERT(bitmapMayBeMutable || fBitmap.isImmutable());
 }

SkBitmapCacheDesc SkBitmapCacheDesc::Make(const SkBitmap& bm, int width, int height) {
    SkBitmapCacheDesc desc;
    desc.fImageID = bm.getGenerationID();
    desc.fWidth = width;
    desc.fHeight = height;
    desc.fBounds = get_bounds_from_bitmap(bm);
    return desc;
}

void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, SkXfermode::Mode compositeOp, RespectImageOrientationEnum shouldRespectImageOrientation)
{
    TRACE_EVENT0("skia", "BitmapImage::draw");
    SkBitmap bitmap;
    if (!bitmapForCurrentFrame(&bitmap))
        return; // It's too early and we don't have an image yet.

    FloatRect normDstRect = adjustForNegativeSize(dstRect);
    FloatRect normSrcRect = adjustForNegativeSize(srcRect);
    normSrcRect.intersect(FloatRect(0, 0, bitmap.width(), bitmap.height()));

    if (normSrcRect.isEmpty() || normDstRect.isEmpty())
        return; // Nothing to draw.

    ImageOrientation orientation = DefaultImageOrientation;
    if (shouldRespectImageOrientation == RespectImageOrientation)
        orientation = frameOrientationAtIndex(m_currentFrame);

    GraphicsContextStateSaver saveContext(*ctxt, false);
    if (orientation != DefaultImageOrientation) {
        saveContext.save();

        // ImageOrientation expects the origin to be at (0, 0)
        ctxt->translate(normDstRect.x(), normDstRect.y());
        normDstRect.setLocation(FloatPoint());

        ctxt->concatCTM(orientation.transformFromDefault(normDstRect.size()));

        if (orientation.usesWidthAsHeight()) {
            // The destination rect will have it's width and height already reversed for the orientation of
            // the image, as it was needed for page layout, so we need to reverse it back here.
            normDstRect = FloatRect(normDstRect.x(), normDstRect.y(), normDstRect.height(), normDstRect.width());
        }
    }

    bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap);
    bool isOpaque = bitmap.isOpaque();

    {
        SkPaint paint;
        SkRect skSrcRect = normSrcRect;
        int initialSaveCount = ctxt->preparePaintForDrawRectToRect(&paint, skSrcRect, normDstRect, compositeOp, !isOpaque, isLazyDecoded, bitmap.isImmutable());
        // We want to filter it if we decided to do interpolation above, or if
        // there is something interesting going on with the matrix (like a rotation).
        // Note: for serialization, we will want to subset the bitmap first so we
        // don't send extra pixels.
        ctxt->drawBitmapRect(bitmap, &skSrcRect, normDstRect, &paint);
        ctxt->canvas()->restoreToCount(initialSaveCount);
    }

    if (isLazyDecoded)
        PlatformInstrumentation::didDrawLazyPixelRef(bitmap.getGenerationID());

    if (ImageObserver* observer = imageObserver())
        observer->didDraw(this);

    startAnimation();
}

 SkSpecialImage_Raster(const SkIRect& subset, const SkBitmap& bm, const SkSurfaceProps* props)
     : INHERITED(subset, bm.getGenerationID(), props)
     , fBitmap(bm) {
     if (bm.pixelRef() && bm.pixelRef()->isPreLocked()) {
         // we only preemptively lock if there is no chance of triggering something expensive
         // like a lazy decode or imagegenerator. PreLocked means it is flat pixels already.
         fBitmap.lockPixels();
     }
 }