Example #1
0
static void validate_pixels_ctable(const SkImageInfo& info, const SkColorTable* ctable) {
    if (info.isEmpty()) {
        return; // can't require ctable if the dimensions are empty
    }
    if (kIndex_8_SkColorType == info.colorType()) {
        SkASSERT(ctable);
    } else {
        SkASSERT(NULL == ctable);
    }
}
Example #2
0
bool SkSurface_Raster::Valid(const SkImageInfo& info, size_t rowBytes) {
    if (info.isEmpty()) {
        return false;
    }

    static const size_t kMaxTotalSize = SK_MaxS32;

    int shift = 0;
    switch (info.colorType()) {
        case kAlpha_8_SkColorType:
            shift = 0;
            break;
        case kRGB_565_SkColorType:
            shift = 1;
            break;
        case kN32_SkColorType:
            shift = 2;
            break;
        case kRGBA_F16_SkColorType:
            shift = 3;
            break;
        default:
            return false;
    }

    if (kIgnoreRowBytesValue == rowBytes) {
        return true;
    }

    uint64_t minRB = (uint64_t)info.width() << shift;
    if (minRB > rowBytes) {
        return false;
    }

    size_t alignedRowBytes = rowBytes >> shift << shift;
    if (alignedRowBytes != rowBytes) {
        return false;
    }

    uint64_t size = sk_64_mul(info.height(), rowBytes);
    if (size > kMaxTotalSize) {
        return false;
    }

    return true;
}
Example #3
0
bool SkInstallDiscardablePixelRef(SkImageGenerator* generator, const SkIRect* subset, SkBitmap* dst,
                                  SkDiscardableMemory::Factory* factory) {
    SkAutoTDelete<SkImageGenerator> autoGenerator(generator);
    if (NULL == autoGenerator.get()) {
        return false;
    }

    SkImageInfo prInfo = autoGenerator->getInfo();
    if (prInfo.isEmpty()) {
        return false;
    }

    SkIPoint origin = SkIPoint::Make(0, 0);
    SkImageInfo bmInfo = prInfo;
    if (subset) {
        const SkIRect prBounds = SkIRect::MakeWH(prInfo.width(), prInfo.height());
        if (subset->isEmpty() || !prBounds.contains(*subset)) {
            return false;
        }
        bmInfo = prInfo.makeWH(subset->width(), subset->height());
        origin.set(subset->x(), subset->y());
    }

    // must compute our desired rowBytes w.r.t. the pixelRef's dimensions, not ours, which may be
    // smaller.
    if (!dst->setInfo(bmInfo, prInfo.minRowBytes())) {
        return false;
    }

    // Since dst->setInfo() may have changed/fixed-up info, we check from the bitmap
    SkASSERT(dst->info().colorType() != kUnknown_SkColorType);

    if (dst->empty()) {  // Use a normal pixelref.
        return dst->tryAllocPixels();
    }
    SkAutoTUnref<SkDiscardablePixelRef> ref(
            new SkDiscardablePixelRef(prInfo, autoGenerator.detach(), dst->rowBytes(), factory));
    dst->setPixelRef(ref, origin.x(), origin.y());
    return true;
}