gecko-dev/gfx/thebes/gfxWindowsSurface.cpp

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * 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 "gfxWindowsSurface.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/HelpersCairo.h"
#include "mozilla/gfx/Logging.h"

#include "cairo.h"
#include "cairo-win32.h"

#include "nsString.h"

gfxWindowsSurface::gfxWindowsSurface(HDC dc, uint32_t flags) :
    mOwnsDC(false), mDC(dc), mWnd(nullptr)
{
    InitWithDC(flags);
}

gfxWindowsSurface::gfxWindowsSurface(IDirect3DSurface9 *surface, uint32_t flags) :
    mOwnsDC(false), mDC(0), mWnd(nullptr)
{
    cairo_surface_t *surf = cairo_win32_surface_create_with_d3dsurface9(surface);
    Init(surf);
}


void
gfxWindowsSurface::MakeInvalid(mozilla::gfx::IntSize& size)
{
    size = mozilla::gfx::IntSize(-1, -1);
}

gfxWindowsSurface::gfxWindowsSurface(const mozilla::gfx::IntSize& realSize, gfxImageFormat imageFormat) :
    mOwnsDC(false), mWnd(nullptr)
{
    mozilla::gfx::IntSize size(realSize);
    if (!mozilla::gfx::Factory::CheckSurfaceSize(size))
        MakeInvalid(size);

    cairo_format_t cformat = GfxFormatToCairoFormat(imageFormat);
    cairo_surface_t *surf =
        cairo_win32_surface_create_with_dib(cformat, size.width, size.height);

    Init(surf);

    if (CairoStatus() == CAIRO_STATUS_SUCCESS) {
        mDC = cairo_win32_surface_get_dc(CairoSurface());
        RecordMemoryUsed(size.width * size.height * 4 + sizeof(gfxWindowsSurface));
    } else {
        mDC = nullptr;
    }
}

gfxWindowsSurface::gfxWindowsSurface(cairo_surface_t *csurf) :
    mOwnsDC(false), mWnd(nullptr)
{
    if (cairo_surface_status(csurf) == 0)
        mDC = cairo_win32_surface_get_dc(csurf);
    else
        mDC = nullptr;

    MOZ_ASSERT(cairo_surface_get_type(csurf) != CAIRO_SURFACE_TYPE_WIN32_PRINTING);

    Init(csurf, true);
}

void
gfxWindowsSurface::InitWithDC(uint32_t flags)
{
    if (flags & FLAG_IS_TRANSPARENT) {
        Init(cairo_win32_surface_create_with_alpha(mDC));
    } else {
        Init(cairo_win32_surface_create(mDC));
    }
}

already_AddRefed<gfxASurface>
gfxWindowsSurface::CreateSimilarSurface(gfxContentType aContent,
                                        const mozilla::gfx::IntSize& aSize)
{
    if (!mSurface || !mSurfaceValid) {
        return nullptr;
    }

    cairo_surface_t *surface;
    if (GetContentType() == gfxContentType::COLOR_ALPHA) {
        // When creating a similar surface to a transparent surface, ensure
        // the new surface uses a DIB. cairo_surface_create_similar won't
        // use  a DIB for a gfxContentType::COLOR surface if this surface doesn't
        // have a DIB (e.g. if we're a transparent window surface). But
        // we need a DIB to perform well if the new surface is composited into
        // a surface that's the result of create_similar(gfxContentType::COLOR_ALPHA)
        // (e.g. a backbuffer for the window) --- that new surface *would*
        // have a DIB.
        gfxImageFormat gformat =
            gfxPlatform::GetPlatform()->OptimalFormatForContent(aContent);
        cairo_format_t cformat = GfxFormatToCairoFormat(gformat);
        surface = cairo_win32_surface_create_with_dib(cformat, aSize.width,
                                                      aSize.height);
    } else {
        surface =
          cairo_surface_create_similar(mSurface, (cairo_content_t)(int)aContent,
                                       aSize.width, aSize.height);
    }

    if (cairo_surface_status(surface)) {
        cairo_surface_destroy(surface);
        return nullptr;
    }

    RefPtr<gfxASurface> result = Wrap(surface, aSize);
    cairo_surface_destroy(surface);
    return result.forget();
}

gfxWindowsSurface::~gfxWindowsSurface()
{
    if (mOwnsDC) {
        if (mWnd)
            ::ReleaseDC(mWnd, mDC);
        else
            ::DeleteDC(mDC);
    }
}

HDC
gfxWindowsSurface::GetDC()
{
    return cairo_win32_surface_get_dc (CairoSurface());
}

already_AddRefed<gfxImageSurface>
gfxWindowsSurface::GetAsImageSurface()
{
    if (!mSurfaceValid) {
        NS_WARNING ("GetImageSurface on an invalid (null) surface; who's calling this without checking for surface errors?");
        return nullptr;
    }

    NS_ASSERTION(CairoSurface() != nullptr, "CairoSurface() shouldn't be nullptr when mSurfaceValid is TRUE!");

    cairo_surface_t *isurf = cairo_win32_surface_get_image(CairoSurface());
    if (!isurf)
        return nullptr;

    RefPtr<gfxImageSurface> result = gfxASurface::Wrap(isurf).downcast<gfxImageSurface>();
    result->SetOpaqueRect(GetOpaqueRect());

    return result.forget();
}

const mozilla::gfx::IntSize
gfxWindowsSurface::GetSize() const
{
    if (!mSurfaceValid) {
        NS_WARNING ("GetImageSurface on an invalid (null) surface; who's calling this without checking for surface errors?");
        return mozilla::gfx::IntSize(-1, -1);
    }

    NS_ASSERTION(mSurface != nullptr, "CairoSurface() shouldn't be nullptr when mSurfaceValid is TRUE!");

    return mozilla::gfx::IntSize(cairo_win32_surface_get_width(mSurface),
                      cairo_win32_surface_get_height(mSurface));
}