gfx/ipc/SharedDIBSurface.cpp
author Dave Townsend <dtownsend@oxymoronical.com>
Mon, 10 Dec 2018 11:05:01 -0800
changeset 449725 c8d6599f45706bf05bebe60c068f8027f69baaee
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1513036: Ignore files generated in the source tree by lalrpop. r=ted

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "SharedDIBSurface.h"

#include "cairo.h"

namespace mozilla {
namespace gfx {

static const cairo_user_data_key_t SHAREDDIB_KEY = {0};

bool SharedDIBSurface::Create(HDC adc, uint32_t aWidth, uint32_t aHeight,
                              bool aTransparent) {
  nsresult rv = mSharedDIB.Create(adc, aWidth, aHeight, aTransparent);
  if (NS_FAILED(rv) || !mSharedDIB.IsValid()) return false;

  InitSurface(aWidth, aHeight, aTransparent);
  return true;
}

bool SharedDIBSurface::Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
                              bool aTransparent) {
  nsresult rv = mSharedDIB.Attach(aHandle, aWidth, aHeight, aTransparent);
  if (NS_FAILED(rv) || !mSharedDIB.IsValid()) return false;

  InitSurface(aWidth, aHeight, aTransparent);
  return true;
}

void SharedDIBSurface::InitSurface(uint32_t aWidth, uint32_t aHeight,
                                   bool aTransparent) {
  long stride = long(aWidth * SharedDIB::kBytesPerPixel);
  unsigned char* data = reinterpret_cast<unsigned char*>(mSharedDIB.GetBits());

  gfxImageFormat format = aTransparent ? SurfaceFormat::A8R8G8B8_UINT32
                                       : SurfaceFormat::X8R8G8B8_UINT32;

  gfxImageSurface::InitWithData(data, IntSize(aWidth, aHeight), stride, format);

  cairo_surface_set_user_data(mSurface, &SHAREDDIB_KEY, this, nullptr);
}

bool SharedDIBSurface::IsSharedDIBSurface(gfxASurface* aSurface) {
  return aSurface && aSurface->GetType() == gfxSurfaceType::Image &&
         aSurface->GetData(&SHAREDDIB_KEY);
}

}  // namespace gfx
}  // namespace mozilla