C++ nsIntRect::TopLeft方法代码示例

/* static */ bool
HwcUtils::PrepareLayerRects(nsIntRect aVisible,
                            const gfx::Matrix& aLayerTransform,
                            const gfx::Matrix& aLayerBufferTransform,
                            nsIntRect aClip, nsIntRect aBufferRect,
                            bool aYFlipped,
                            hwc_rect_t* aSourceCrop, hwc_rect_t* aVisibleRegionScreen) {

    gfxMatrix aTransform = gfx::ThebesMatrix(aLayerTransform);
    gfxRect visibleRect(aVisible);
    gfxRect clip(aClip);
    gfxRect visibleRectScreen = aTransform.TransformBounds(visibleRect);
    // |clip| is guaranteed to be integer
    visibleRectScreen.IntersectRect(visibleRectScreen, clip);

    if (visibleRectScreen.IsEmpty()) {
        return false;
    }

    gfxMatrix inverse = gfx::ThebesMatrix(aLayerBufferTransform);
    inverse.Invert();
    gfxRect crop = inverse.TransformBounds(visibleRectScreen);

    //clip to buffer size
    crop.IntersectRect(crop, aBufferRect);
    crop.Round();

    if (crop.IsEmpty()) {
        return false;
    }

    //propagate buffer clipping back to visible rect
    gfxMatrix layerBufferTransform = gfx::ThebesMatrix(aLayerBufferTransform);
    visibleRectScreen = layerBufferTransform.TransformBounds(crop);
    visibleRectScreen.Round();

    // Map from layer space to buffer space
    crop -= aBufferRect.TopLeft();
    if (aYFlipped) {
        crop.y = aBufferRect.height - (crop.y + crop.height);
    }

    aSourceCrop->left = crop.x;
    aSourceCrop->top  = crop.y;
    aSourceCrop->right  = crop.x + crop.width;
    aSourceCrop->bottom = crop.y + crop.height;

    aVisibleRegionScreen->left = visibleRectScreen.x;
    aVisibleRegionScreen->top  = visibleRectScreen.y;
    aVisibleRegionScreen->right  = visibleRectScreen.x + visibleRectScreen.width;
    aVisibleRegionScreen->bottom = visibleRectScreen.y + visibleRectScreen.height;

    return true;
}

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();
}

/**
 * Sets hwc layer rectangles required for hwc composition
 *
 * @param aVisible Input. Layer's unclipped visible rectangle
 *        The origin is the top-left corner of the layer
 * @param aTransform Input. Layer's transformation matrix
 *        It transforms from layer space to screen space
 * @param aClip Input. A clipping rectangle.
 *        The origin is the top-left corner of the screen
 * @param aBufferRect Input. The layer's buffer bounds
 *        The origin is the top-left corner of the layer
 * @param aSurceCrop Output. Area of the source to consider,
 *        the origin is the top-left corner of the buffer
 * @param aVisibleRegionScreen Output. Visible region in screen space.
 *        The origin is the top-left corner of the screen
 * @return true if the layer should be rendered.
 *         false if the layer can be skipped
 */
static bool
PrepareLayerRects(nsIntRect aVisible, const gfxMatrix& aTransform,
                  nsIntRect aClip, nsIntRect aBufferRect,
                  hwc_rect_t* aSourceCrop, hwc_rect_t* aVisibleRegionScreen) {

    gfxRect visibleRect(aVisible);
    gfxRect clip(aClip);
    gfxRect visibleRectScreen = aTransform.TransformBounds(visibleRect);
    // |clip| is guaranteed to be integer
    visibleRectScreen.IntersectRect(visibleRectScreen, clip);

    if (visibleRectScreen.IsEmpty()) {
        LOGD("Skip layer");
        return false;
    }

    gfxMatrix inverse(aTransform);
    inverse.Invert();
    gfxRect crop = inverse.TransformBounds(visibleRectScreen);

    //clip to buffer size
    crop.IntersectRect(crop, aBufferRect);
    crop.RoundOut();

    if (crop.IsEmpty()) {
        LOGD("Skip layer");
        return false;
    }

    //propagate buffer clipping back to visible rect
    visibleRectScreen = aTransform.TransformBounds(crop);
    visibleRectScreen.RoundOut();

    // Map from layer space to buffer space
    crop -= aBufferRect.TopLeft();

    aSourceCrop->left = crop.x;
    aSourceCrop->top  = crop.y;
    aSourceCrop->right  = crop.x + crop.width;
    aSourceCrop->bottom = crop.y + crop.height;

    aVisibleRegionScreen->left = visibleRectScreen.x;
    aVisibleRegionScreen->top  = visibleRectScreen.y;
    aVisibleRegionScreen->right  = visibleRectScreen.x + visibleRectScreen.width;
    aVisibleRegionScreen->bottom = visibleRectScreen.y + visibleRectScreen.height;

    return true;
}

void
GrallocTextureHostBasic::SetCropRect(nsIntRect aCropRect)
{
  MOZ_ASSERT(aCropRect.TopLeft() == gfx::IntPoint(0, 0));
  MOZ_ASSERT(!aCropRect.IsEmpty());
  MOZ_ASSERT(aCropRect.width <= mSize.width);
  MOZ_ASSERT(aCropRect.height <= mSize.height);

  gfx::IntSize cropSize(aCropRect.width, aCropRect.height);
  if (mCropSize == cropSize) {
    return;
  }

  mCropSize = cropSize;
  ClearTextureSource();
}

void
GLBlitTextureImageHelper::BlitTextureImage(TextureImage *aSrc, const nsIntRect& aSrcRect,
                                           TextureImage *aDst, const nsIntRect& aDstRect)
{
    GLContext *gl = mCompositor->gl();
    NS_ASSERTION(!aSrc->InUpdate(), "Source texture is in update!");
    NS_ASSERTION(!aDst->InUpdate(), "Destination texture is in update!");

    if (!aSrc || !aDst || aSrcRect.IsEmpty() || aDstRect.IsEmpty())
        return;

    int savedFb = 0;
    gl->fGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &savedFb);

    ScopedGLState scopedScissorTestState(gl, LOCAL_GL_SCISSOR_TEST, false);
    ScopedGLState scopedBlendState(gl, LOCAL_GL_BLEND, false);

    // 2.0 means scale up by two
    float blitScaleX = float(aDstRect.width) / float(aSrcRect.width);
    float blitScaleY = float(aDstRect.height) / float(aSrcRect.height);

    // We start iterating over all destination tiles
    aDst->BeginBigImageIteration();
    do {
        // calculate portion of the tile that is going to be painted to
        nsIntRect dstSubRect;
        nsIntRect dstTextureRect = ThebesIntRect(aDst->GetTileRect());
        dstSubRect.IntersectRect(aDstRect, dstTextureRect);

        // this tile is not part of the destination rectangle aDstRect
        if (dstSubRect.IsEmpty())
            continue;

        // (*) transform the rect of this tile into the rectangle defined by aSrcRect...
        nsIntRect dstInSrcRect(dstSubRect);
        dstInSrcRect.MoveBy(-aDstRect.TopLeft());
        // ...which might be of different size, hence scale accordingly
        dstInSrcRect.ScaleRoundOut(1.0f / blitScaleX, 1.0f / blitScaleY);
        dstInSrcRect.MoveBy(aSrcRect.TopLeft());

        SetBlitFramebufferForDestTexture(aDst->GetTextureID());
        UseBlitProgram();

        aSrc->BeginBigImageIteration();
        // now iterate over all tiles in the source Image...
        do {
            // calculate portion of the source tile that is in the source rect
            nsIntRect srcSubRect;
            nsIntRect srcTextureRect = ThebesIntRect(aSrc->GetTileRect());
            srcSubRect.IntersectRect(aSrcRect, srcTextureRect);

            // this tile is not part of the source rect
            if (srcSubRect.IsEmpty()) {
                continue;
            }
            // calculate intersection of source rect with destination rect
            srcSubRect.IntersectRect(srcSubRect, dstInSrcRect);
            // this tile does not overlap the current destination tile
            if (srcSubRect.IsEmpty()) {
                continue;
            }
            // We now have the intersection of
            //     the current source tile
            // and the desired source rectangle
            // and the destination tile
            // and the desired destination rectange
            // in destination space.
            // We need to transform this back into destination space, inverting the transform from (*)
            nsIntRect srcSubInDstRect(srcSubRect);
            srcSubInDstRect.MoveBy(-aSrcRect.TopLeft());
            srcSubInDstRect.ScaleRoundOut(blitScaleX, blitScaleY);
            srcSubInDstRect.MoveBy(aDstRect.TopLeft());

            // we transform these rectangles to be relative to the current src and dst tiles, respectively
            nsIntSize srcSize = srcTextureRect.Size();
            nsIntSize dstSize = dstTextureRect.Size();
            srcSubRect.MoveBy(-srcTextureRect.x, -srcTextureRect.y);
            srcSubInDstRect.MoveBy(-dstTextureRect.x, -dstTextureRect.y);

            float dx0 = 2.0f * float(srcSubInDstRect.x) / float(dstSize.width) - 1.0f;
            float dy0 = 2.0f * float(srcSubInDstRect.y) / float(dstSize.height) - 1.0f;
            float dx1 = 2.0f * float(srcSubInDstRect.x + srcSubInDstRect.width) / float(dstSize.width) - 1.0f;
            float dy1 = 2.0f * float(srcSubInDstRect.y + srcSubInDstRect.height) / float(dstSize.height) - 1.0f;
            ScopedViewportRect autoViewportRect(gl, 0, 0, dstSize.width, dstSize.height);

            RectTriangles rects;

            nsIntSize realTexSize = srcSize;
            if (!CanUploadNonPowerOfTwo(gl)) {
                realTexSize = nsIntSize(gfx::NextPowerOfTwo(srcSize.width),
                                        gfx::NextPowerOfTwo(srcSize.height));
            }

            if (aSrc->GetWrapMode() == LOCAL_GL_REPEAT) {
                rects.addRect(/* dest rectangle */
                        dx0, dy0, dx1, dy1,
                        /* tex coords */
                        srcSubRect.x / float(realTexSize.width),
                        srcSubRect.y / float(realTexSize.height),
                        srcSubRect.XMost() / float(realTexSize.width),
//.........这里部分代码省略.........

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);
    }
}

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.........