C++ nsIntRect::Size方法代码示例

/*static*/ ScreenConfiguration
nsScreenGonk::GetConfiguration()
{
    ScreenOrientation orientation = ComputeOrientation(sScreenRotation,
                                                       gScreenBounds.Size());
    uint32_t colorDepth = ColorDepth();
    // NB: perpetuating colorDepth == pixelDepth illusion here, for
    // consistency.
    return ScreenConfiguration(sVirtualBounds, orientation,
                               colorDepth, colorDepth);
}

void
gfxASurface::FastMovePixels(const nsIntRect& aSourceRect,
                            const nsIntPoint& aDestTopLeft)
{
    // Used when the backend can internally handle self copies.
    nsIntRect dest(aDestTopLeft, aSourceRect.Size());
    
    nsRefPtr<gfxContext> ctx = new gfxContext(this);
    ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
    nsIntPoint srcOrigin = dest.TopLeft() - aSourceRect.TopLeft();
    ctx->SetSource(this, gfxPoint(srcOrigin.x, srcOrigin.y));
    ctx->Rectangle(gfxRect(dest.x, dest.y, dest.width, dest.height));
    ctx->Fill();
}

RawAccessFrameRef
Decoder::AllocateFrameInternal(uint32_t aFrameNum,
                               const nsIntSize& aTargetSize,
                               const nsIntRect& aFrameRect,
                               uint32_t aDecodeFlags,
                               SurfaceFormat aFormat,
                               uint8_t aPaletteDepth,
                               imgFrame* aPreviousFrame)
{
  if (mDataError || NS_FAILED(mFailCode)) {
    return RawAccessFrameRef();
  }

  if (aFrameNum != mFrameCount) {
    MOZ_ASSERT_UNREACHABLE("Allocating frames out of order");
    return RawAccessFrameRef();
  }

  if (aTargetSize.width <= 0 || aTargetSize.height <= 0 ||
      aFrameRect.width <= 0 || aFrameRect.height <= 0) {
    NS_WARNING("Trying to add frame with zero or negative size");
    return RawAccessFrameRef();
  }

  const uint32_t bytesPerPixel = aPaletteDepth == 0 ? 4 : 1;
  if (!SurfaceCache::CanHold(aFrameRect.Size(), bytesPerPixel)) {
    NS_WARNING("Trying to add frame that's too large for the SurfaceCache");
    return RawAccessFrameRef();
  }

  nsRefPtr<imgFrame> frame = new imgFrame();
  bool nonPremult =
    aDecodeFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
  if (NS_FAILED(frame->InitForDecoder(aTargetSize, aFrameRect, aFormat,
                                      aPaletteDepth, nonPremult))) {
    NS_WARNING("imgFrame::Init should succeed");
    return RawAccessFrameRef();
  }

  RawAccessFrameRef ref = frame->RawAccessRef();
  if (!ref) {
    frame->Abort();
    return RawAccessFrameRef();
  }

  InsertOutcome outcome =
    SurfaceCache::Insert(frame, ImageKey(mImage.get()),
                         RasterSurfaceKey(aTargetSize,
                                          aDecodeFlags,
                                          aFrameNum),
                         Lifetime::Persistent);
  if (outcome == InsertOutcome::FAILURE) {
    // We couldn't insert the surface, almost certainly due to low memory. We
    // treat this as a permanent error to help the system recover; otherwise, we
    // might just end up attempting to decode this image again immediately.
    ref->Abort();
    return RawAccessFrameRef();
  } else if (outcome == InsertOutcome::FAILURE_ALREADY_PRESENT) {
    // Another decoder beat us to decoding this frame. We abort this decoder
    // rather than treat this as a real error.
    mDecodeAborted = true;
    ref->Abort();
    return RawAccessFrameRef();
  }

  nsIntRect refreshArea;

  if (aFrameNum == 1) {
    MOZ_ASSERT(aPreviousFrame, "Must provide a previous frame when animated");
    aPreviousFrame->SetRawAccessOnly();

    // If we dispose of the first frame by clearing it, then the first frame's
    // refresh area is all of itself.
    // RESTORE_PREVIOUS is invalid (assumed to be DISPOSE_CLEAR).
    AnimationData previousFrameData = aPreviousFrame->GetAnimationData();
    if (previousFrameData.mDisposalMethod == DisposalMethod::CLEAR ||
        previousFrameData.mDisposalMethod == DisposalMethod::CLEAR_ALL ||
        previousFrameData.mDisposalMethod == DisposalMethod::RESTORE_PREVIOUS) {
      refreshArea = previousFrameData.mRect;
    }
  }

  if (aFrameNum > 0) {
    ref->SetRawAccessOnly();

    // Some GIFs are huge but only have a small area that they animate. We only
    // need to refresh that small area when frame 0 comes around again.
    refreshArea.UnionRect(refreshArea, frame->GetRect());
  }

  mFrameCount++;
  mImage->OnAddedFrame(mFrameCount, refreshArea);

  return ref;
}

void
gfxImageSurface::MovePixels(const nsIntRect& aSourceRect,
                            const nsIntPoint& aDestTopLeft)
{
    const nsIntRect bounds(0, 0, mSize.width, mSize.height);
    nsIntPoint offset = aDestTopLeft - aSourceRect.TopLeft(); 
    nsIntRect clippedSource = aSourceRect;
    clippedSource.IntersectRect(clippedSource, bounds);
    nsIntRect clippedDest = clippedSource + offset;
    clippedDest.IntersectRect(clippedDest, bounds);
    const nsIntRect dest = clippedDest;
    const nsIntRect source = dest - offset;
    // NB: this relies on IntersectRect() and operator+/- preserving
    // x/y for empty rectangles
    NS_ABORT_IF_FALSE(bounds.Contains(dest) && bounds.Contains(source) &&
                      aSourceRect.Contains(source) &&
                      nsIntRect(aDestTopLeft, aSourceRect.Size()).Contains(dest) &&
                      source.Size() == dest.Size() &&
                      offset == (dest.TopLeft() - source.TopLeft()),
                      "Messed up clipping, crash or corruption will follow");
    if (source.IsEmpty() || source.IsEqualInterior(dest)) {
        return;
    }

    long naturalStride = ComputeStride(mSize, mFormat);
    if (mStride == naturalStride && dest.width == bounds.width) {
        // Fast path: this is a vertical shift of some rows in a
        // "normal" image surface.  We can directly memmove and
        // hopefully stay in SIMD land.
        unsigned char* dst = mData + dest.y * mStride;
        const unsigned char* src = mData + source.y * mStride;
        size_t nBytes = dest.height * mStride;
        memmove(dst, src, nBytes);
        return;
    }

    // Slow(er) path: have to move row-by-row.
    const int32_t bpp = BytePerPixelFromFormat(mFormat);
    const size_t nRowBytes = dest.width * bpp;
    // dstRow points at the first pixel within the current destination
    // row, and similarly for srcRow.  endSrcRow is one row beyond the
    // last row we need to copy.  stride is either +mStride or
    // -mStride, depending on which direction we're copying.
    unsigned char* dstRow;
    unsigned char* srcRow;
    unsigned char* endSrcRow;   // NB: this may point outside the image
    long stride;
    if (dest.y > source.y) {
        // We're copying down from source to dest, so walk backwards
        // starting from the last rows to avoid stomping pixels we
        // need.
        stride = -mStride;
        dstRow = mData + dest.x * bpp + (dest.YMost() - 1) * mStride;
        srcRow = mData + source.x * bpp + (source.YMost() - 1) * mStride;
        endSrcRow = mData + source.x * bpp + (source.y - 1) * mStride;
    } else {
        stride = mStride;
        dstRow = mData + dest.x * bpp + dest.y * mStride;
        srcRow = mData + source.x * bpp + source.y * mStride;
        endSrcRow = mData + source.x * bpp + source.YMost() * mStride;
    }

    for (; srcRow != endSrcRow; dstRow += stride, srcRow += stride) {
        memmove(dstRow, srcRow, nRowBytes);
    }
}

RawAccessFrameRef
Decoder::InternalAddFrame(uint32_t aFrameNum,
                          const nsIntSize& aTargetSize,
                          const nsIntRect& aFrameRect,
                          uint32_t aDecodeFlags,
                          SurfaceFormat aFormat,
                          uint8_t aPaletteDepth,
                          imgFrame* aPreviousFrame)
{
  MOZ_ASSERT(aFrameNum <= mFrameCount, "Invalid frame index!");
  if (aFrameNum > mFrameCount) {
    return RawAccessFrameRef();
  }

  if (aTargetSize.width <= 0 || aTargetSize.height <= 0 ||
      aFrameRect.width <= 0 || aFrameRect.height <= 0) {
    NS_WARNING("Trying to add frame with zero or negative size");
    return RawAccessFrameRef();
  }

  const uint32_t bytesPerPixel = aPaletteDepth == 0 ? 4 : 1;
  if (!SurfaceCache::CanHold(aFrameRect.Size(), bytesPerPixel)) {
    NS_WARNING("Trying to add frame that's too large for the SurfaceCache");
    return RawAccessFrameRef();
  }

  nsRefPtr<imgFrame> frame = new imgFrame();
  bool nonPremult =
    aDecodeFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
  if (NS_FAILED(frame->InitForDecoder(aTargetSize, aFrameRect, aFormat,
                                      aPaletteDepth, nonPremult))) {
    NS_WARNING("imgFrame::Init should succeed");
    return RawAccessFrameRef();
  }

  RawAccessFrameRef ref = frame->RawAccessRef();
  if (!ref) {
    frame->Abort();
    return RawAccessFrameRef();
  }

  InsertOutcome outcome =
    SurfaceCache::Insert(frame, ImageKey(mImage.get()),
                         RasterSurfaceKey(aTargetSize,
                                          aDecodeFlags,
                                          aFrameNum),
                         Lifetime::Persistent);
  if (outcome != InsertOutcome::SUCCESS) {
    // We either hit InsertOutcome::FAILURE, which is a temporary failure due to
    // low memory (we know it's not permanent because we checked CanHold()
    // above), or InsertOutcome::FAILURE_ALREADY_PRESENT, which means that
    // another decoder beat us to decoding this frame. Either way, we should
    // abort this decoder rather than treat this as a real error.
    mDecodeAborted = true;
    ref->Abort();
    return RawAccessFrameRef();
  }

  nsIntRect refreshArea;

  if (aFrameNum == 1) {
    MOZ_ASSERT(aPreviousFrame, "Must provide a previous frame when animated");
    aPreviousFrame->SetRawAccessOnly();

    // If we dispose of the first frame by clearing it, then the first frame's
    // refresh area is all of itself.
    // RESTORE_PREVIOUS is invalid (assumed to be DISPOSE_CLEAR).
    AnimationData previousFrameData = aPreviousFrame->GetAnimationData();
    if (previousFrameData.mDisposalMethod == DisposalMethod::CLEAR ||
        previousFrameData.mDisposalMethod == DisposalMethod::CLEAR_ALL ||
        previousFrameData.mDisposalMethod == DisposalMethod::RESTORE_PREVIOUS) {
      refreshArea = previousFrameData.mRect;
    }
  }

  if (aFrameNum > 0) {
    ref->SetRawAccessOnly();

    // Some GIFs are huge but only have a small area that they animate. We only
    // need to refresh that small area when frame 0 comes around again.
    refreshArea.UnionRect(refreshArea, frame->GetRect());
  }

  mFrameCount++;
  mImage->OnAddedFrame(mFrameCount, refreshArea);

  return ref;
}

void
gfxXlibNativeRenderer::DrawFallback(DrawTarget* drawTarget, gfxContext* ctx, gfxASurface* target,
                                    nsIntSize& size, nsIntRect& drawingRect,
                                    bool canDrawOverBackground, uint32_t flags,
                                    Screen* screen, Visual* visual, DrawOutput* result)
{
    gfxPoint offset(drawingRect.x, drawingRect.y);

    DrawingMethod method;
    nsRefPtr<gfxXlibSurface> tempXlibSurface = 
        CreateTempXlibSurface(target, drawingRect.Size(),
                              canDrawOverBackground, flags, screen, visual,
                              &method);
    if (!tempXlibSurface)
        return;

    if (drawingRect.Size() != size || method == eCopyBackground) {
        // Only drawing a portion, or copying background,
        // so won't return a result.
        result = nullptr;
    }
  
    nsRefPtr<gfxContext> tmpCtx;
    bool drawIsOpaque = (flags & DRAW_IS_OPAQUE) != 0;
    if (!drawIsOpaque) {
        tmpCtx = new gfxContext(tempXlibSurface);
        if (method == eCopyBackground) {
            tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
            tmpCtx->SetSource(target, -(offset + ctx->CurrentMatrix().GetTranslation()));
            // The copy from the tempXlibSurface to the target context should
            // use operator SOURCE, but that would need a mask to bound the
            // operation.  Here we only copy opaque backgrounds so operator
            // OVER will behave like SOURCE masked by the surface.
            NS_ASSERTION(tempXlibSurface->GetContentType()
                         == GFX_CONTENT_COLOR,
                         "Don't copy background with a transparent surface");
        } else {
            tmpCtx->SetOperator(gfxContext::OPERATOR_CLEAR);
        }
        tmpCtx->Paint();
    }

    if (!DrawOntoTempSurface(tempXlibSurface, -drawingRect.TopLeft())) {
        return;
    }
  
    if (method != eAlphaExtraction) {
        if (drawTarget) {
            RefPtr<SourceSurface> sourceSurface = gfxPlatform::GetPlatform()->
                GetSourceSurfaceForSurface(drawTarget, tempXlibSurface);
            drawTarget->DrawSurface(sourceSurface,
                Rect(offset.x, offset.y, size.width, size.height),
                Rect(0, 0, size.width, size.height));
        } else {
            ctx->SetSource(tempXlibSurface, offset);
            ctx->Paint();
        }
        if (result) {
            result->mSurface = tempXlibSurface;
            /* fill in the result with what we know, which is really just what our
               assumption was */
            result->mUniformAlpha = true;
            result->mColor.a = 1.0;
        }
        return;
    }
    
    nsRefPtr<gfxImageSurface> blackImage =
        CopyXlibSurfaceToImage(tempXlibSurface, gfxImageFormatARGB32);
    
    tmpCtx->SetDeviceColor(gfxRGBA(1.0, 1.0, 1.0));
    tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
    tmpCtx->Paint();
    DrawOntoTempSurface(tempXlibSurface, -drawingRect.TopLeft());
    nsRefPtr<gfxImageSurface> whiteImage =
        CopyXlibSurfaceToImage(tempXlibSurface, gfxImageFormatRGB24);
  
    if (blackImage->CairoStatus() == CAIRO_STATUS_SUCCESS &&
        whiteImage->CairoStatus() == CAIRO_STATUS_SUCCESS) {
        gfxAlphaRecovery::Analysis analysis;
        if (!gfxAlphaRecovery::RecoverAlpha(blackImage, whiteImage,
                                            result ? &analysis : nullptr))
            return;

        gfxASurface* paintSurface = blackImage;
        /* if the caller wants to retrieve the rendered image, put it into
           a 'similar' surface, and use that as the source for the drawing right
           now. This means we always return a surface similar to the surface
           used for 'cr', which is ideal if it's going to be cached and reused.
           We do not return an image if the result has uniform color (including
           alpha). */
        if (result) {
            if (analysis.uniformAlpha) {
                result->mUniformAlpha = true;
                result->mColor.a = analysis.alpha;
            }
            if (analysis.uniformColor) {
                result->mUniformColor = true;
                result->mColor.r = analysis.r;
                result->mColor.g = analysis.g;
//.........这里部分代码省略.........