void
gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
uint32_t flags, Screen *screen, Visual *visual)
{
gfxMatrix matrix = ctx->CurrentMatrix();
// We can only draw direct or onto a copied background if pixels align and
// native drawing is compatible with the current operator. (The matrix is
// actually also pixel-exact for flips and right-angle rotations, which
// would permit copying the background but not drawing direct.)
bool matrixIsIntegerTranslation = !matrix.HasNonIntegerTranslation();
bool canDrawOverBackground = matrixIsIntegerTranslation &&
ctx->CurrentOperator() == gfxContext::OPERATOR_OVER;
// The padding of 0.5 for non-pixel-exact transformations used here is
// the same as what _cairo_pattern_analyze_filter uses.
const gfxFloat filterRadius = 0.5;
gfxRect affectedRect(0.0, 0.0, size.width, size.height);
if (!matrixIsIntegerTranslation) {
// The filter footprint means that the affected rectangle is a
// little larger than the drawingRect;
affectedRect.Inflate(filterRadius);
NATIVE_DRAWING_NOTE("FALLBACK: matrix not integer translation");
} else if (!canDrawOverBackground) {
NATIVE_DRAWING_NOTE("FALLBACK: unsupported operator");
}
// Clipping to the region affected by drawing allows us to consider only
// the portions of the clip region that will be affected by drawing.
gfxRect clipExtents;
{
gfxContextAutoSaveRestore autoSR(ctx);
ctx->Clip(affectedRect);
clipExtents = ctx->GetClipExtents();
if (clipExtents.IsEmpty())
return; // nothing to do
if (canDrawOverBackground &&
DrawDirect(ctx, size, flags, screen, visual))
return;
}
IntRect drawingRect(IntPoint(0, 0), size);
// Drawing need only be performed within the clip extents
// (and padding for the filter).
if (!matrixIsIntegerTranslation) {
// The source surface may need to be a little larger than the clip
// extents due to the filter footprint.
clipExtents.Inflate(filterRadius);
}
clipExtents.RoundOut();
IntRect intExtents(int32_t(clipExtents.X()),
int32_t(clipExtents.Y()),
int32_t(clipExtents.Width()),
int32_t(clipExtents.Height()));
drawingRect.IntersectRect(drawingRect, intExtents);
gfxPoint offset(drawingRect.x, drawingRect.y);
DrawingMethod method;
DrawTarget* drawTarget = ctx->GetDrawTarget();
Matrix dtTransform = drawTarget->GetTransform();
gfxPoint deviceTranslation = gfxPoint(dtTransform._31, dtTransform._32);
cairo_surface_t* cairoTarget = static_cast<cairo_surface_t*>
(drawTarget->GetNativeSurface(NativeSurfaceType::CAIRO_SURFACE));
cairo_surface_t* tempXlibSurface =
CreateTempXlibSurface(cairoTarget, drawTarget, size,
canDrawOverBackground, flags, screen, visual,
&method);
if (!tempXlibSurface)
return;
bool drawIsOpaque = (flags & DRAW_IS_OPAQUE) != 0;
if (!drawIsOpaque) {
cairo_t* tmpCtx = cairo_create(tempXlibSurface);
if (method == eCopyBackground) {
NS_ASSERTION(cairoTarget, "eCopyBackground only used when there's a cairoTarget");
cairo_set_operator(tmpCtx, CAIRO_OPERATOR_SOURCE);
gfxPoint pt = -(offset + deviceTranslation);
cairo_set_source_surface(tmpCtx, cairoTarget, pt.x, pt.y);
// 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(cairo_surface_get_content(tempXlibSurface) == CAIRO_CONTENT_COLOR,
"Don't copy background with a transparent surface");
} else {
cairo_set_operator(tmpCtx, CAIRO_OPERATOR_CLEAR);
}
cairo_paint(tmpCtx);
cairo_destroy(tmpCtx);
}
if (!DrawOntoTempSurface(tempXlibSurface, -drawingRect.TopLeft())) {
cairo_surface_destroy(tempXlibSurface);
return;
}
SurfaceFormat moz2DFormat =
cairo_surface_get_content(tempXlibSurface) == CAIRO_CONTENT_COLOR ?
SurfaceFormat::B8G8R8A8 : SurfaceFormat::B8G8R8X8;
if (method != eAlphaExtraction) {
if (drawTarget) {
NativeSurface native;
native.mFormat = moz2DFormat;
native.mType = NativeSurfaceType::CAIRO_SURFACE;
native.mSurface = tempXlibSurface;
native.mSize = size;
RefPtr<SourceSurface> sourceSurface =
drawTarget->CreateSourceSurfaceFromNativeSurface(native);
if (sourceSurface) {
drawTarget->DrawSurface(sourceSurface,
Rect(offset.x, offset.y, size.width, size.height),
Rect(0, 0, size.width, size.height));
}
} else {
nsRefPtr<gfxASurface> tmpSurf = gfxASurface::Wrap(tempXlibSurface);
ctx->SetSource(tmpSurf, offset);
ctx->Paint();
}
cairo_surface_destroy(tempXlibSurface);
return;
}
nsRefPtr<gfxImageSurface> blackImage =
CopyXlibSurfaceToImage(tempXlibSurface, size, gfxImageFormat::ARGB32);
cairo_t* tmpCtx = cairo_create(tempXlibSurface);
cairo_set_source_rgba(tmpCtx, 1.0, 1.0, 1.0, 1.0);
cairo_set_operator(tmpCtx, CAIRO_OPERATOR_SOURCE);
cairo_paint(tmpCtx);
cairo_destroy(tmpCtx);
DrawOntoTempSurface(tempXlibSurface, -drawingRect.TopLeft());
nsRefPtr<gfxImageSurface> whiteImage =
CopyXlibSurfaceToImage(tempXlibSurface, size, gfxImageFormat::RGB24);
if (blackImage->CairoStatus() == CAIRO_STATUS_SUCCESS &&
whiteImage->CairoStatus() == CAIRO_STATUS_SUCCESS) {
if (!gfxAlphaRecovery::RecoverAlpha(blackImage, whiteImage)) {
cairo_surface_destroy(tempXlibSurface);
return;
}
gfxASurface* paintSurface = blackImage;
if (drawTarget) {
NativeSurface native;
native.mFormat = moz2DFormat;
native.mType = NativeSurfaceType::CAIRO_SURFACE;
native.mSurface = paintSurface->CairoSurface();
native.mSize = size;
RefPtr<SourceSurface> sourceSurface =
drawTarget->CreateSourceSurfaceFromNativeSurface(native);
if (sourceSurface) {
drawTarget->DrawSurface(sourceSurface,
Rect(offset.x, offset.y, size.width, size.height),
Rect(0, 0, size.width, size.height));
}
} else {
ctx->SetSource(paintSurface, offset);
ctx->Paint();
}
}
cairo_surface_destroy(tempXlibSurface);
}
