C++ gfxMatrix::Rotate方法代码示例

NS_IMETHODIMP
nsScreenGonk::SetRotation(PRUint32 aRotation)
{
    if (!(ROTATION_0_DEG <= aRotation && aRotation <= ROTATION_270_DEG))
        return NS_ERROR_ILLEGAL_VALUE;

    if (sScreenRotation == aRotation)
        return NS_OK;

    sScreenRotation = aRotation;
    sRotationMatrix.Reset();
    switch ((aRotation + sPhysicalScreenRotation) % (360 / 90)) {
    case nsIScreen::ROTATION_0_DEG:
        sVirtualBounds = gScreenBounds;
        break;
    case nsIScreen::ROTATION_90_DEG:
        sRotationMatrix.Translate(gfxPoint(gScreenBounds.width, 0));
        sRotationMatrix.Rotate(M_PI / 2);
        sVirtualBounds = nsIntRect(0, 0, gScreenBounds.height,
                                         gScreenBounds.width);
        break;
    case nsIScreen::ROTATION_180_DEG:
        sRotationMatrix.Translate(gfxPoint(gScreenBounds.width,
                                           gScreenBounds.height));
        sRotationMatrix.Rotate(M_PI);
        sVirtualBounds = gScreenBounds;
        break;
    case nsIScreen::ROTATION_270_DEG:
        sRotationMatrix.Translate(gfxPoint(0, gScreenBounds.height));
        sRotationMatrix.Rotate(M_PI * 3 / 2);
        sVirtualBounds = nsIntRect(0, 0, gScreenBounds.height,
                                         gScreenBounds.width);
        break;
    default:
        MOZ_NOT_REACHED("Unknown rotation");
        break;
    }

    for (unsigned int i = 0; i < sTopWindows.Length(); i++)
        sTopWindows[i]->Resize(sVirtualBounds.width,
                               sVirtualBounds.height,
                               !i);

    nsAppShell::NotifyScreenRotation();

    return NS_OK;
}

nsWindow::nsWindow()
{
    if (!sScreenInitialized) {
        // Watching screen on/off state by using a pthread
        // which implicitly calls exit() when the main thread ends
        if (pthread_create(&sFramebufferWatchThread, NULL, frameBufferWatcher, NULL)) {
            NS_RUNTIMEABORT("Failed to create framebufferWatcherThread, aborting...");
        }

        nsIntSize screenSize;
        bool gotFB = Framebuffer::GetSize(&screenSize);
        if (!gotFB) {
            NS_RUNTIMEABORT("Failed to get size from framebuffer, aborting...");
        }
        gScreenBounds = nsIntRect(nsIntPoint(0, 0), screenSize);

        char propValue[PROPERTY_VALUE_MAX];
        property_get("ro.sf.hwrotation", propValue, "0");
        sPhysicalScreenRotation = atoi(propValue) / 90;

        // Unlike nsScreenGonk::SetRotation(), only support 0 and 180 as there
        // are no known screens that are mounted at 90 or 270 at the moment.
        switch (sPhysicalScreenRotation) {
        case nsIScreen::ROTATION_0_DEG:
            break;
        case nsIScreen::ROTATION_180_DEG:
            sRotationMatrix.Translate(gfxPoint(gScreenBounds.width,
                                               gScreenBounds.height));
            sRotationMatrix.Rotate(M_PI);
            break;
        default:
            MOZ_NOT_REACHED("Unknown rotation");
            break;
        }
        sVirtualBounds = gScreenBounds;

        sScreenInitialized = true;

        nsAppShell::NotifyScreenInitialized();

        // This is a hack to force initialization of the compositor
        // resources, if we're going to use omtc.
        //
        // NB: GetPlatform() will create the gfxPlatform, which wants
        // to know the color depth, which asks our native window.
        // This has to happen after other init has finished.
        gfxPlatform::GetPlatform();
        sUsingOMTC = ShouldUseOffMainThreadCompositing();

        property_get("ro.display.colorfill", propValue, "0");
        sUsingHwc = Preferences::GetBool("layers.composer2d.enabled",
                                         atoi(propValue) == 1);

        if (sUsingOMTC) {
          sOMTCSurface = new gfxImageSurface(gfxIntSize(1, 1),
                                             gfxASurface::ImageFormatRGB24);
        }
    }
}

nsWindow::nsWindow()
{
    if (!sGLContext && !sFramebufferOpen && !sUsingOMTC) {
        // workaround Bug 725143
        hal::SetScreenEnabled(true);

        // Watching screen on/off state by using a pthread
        // which implicitly calls exit() when the main thread ends
        if (pthread_create(&sFramebufferWatchThread, NULL, frameBufferWatcher, NULL)) {
            NS_RUNTIMEABORT("Failed to create framebufferWatcherThread, aborting...");
        }

        sUsingOMTC = UseOffMainThreadCompositing();

        // We (apparently) don't have a way to tell if allocating the
        // fbs succeeded or failed.
        gNativeWindow = new android::FramebufferNativeWindow();
        if (sUsingOMTC) {
            nsIntSize screenSize;
            bool gotFB = Framebuffer::GetSize(&screenSize);
            MOZ_ASSERT(gotFB);
            gScreenBounds = nsIntRect(nsIntPoint(0, 0), screenSize);

            sOMTCSurface = new gfxImageSurface(gfxIntSize(1, 1),
                gfxASurface::ImageFormatRGB24);
        } else {
            sGLContext = GLContextProvider::CreateForWindow(this);
            // CreateForWindow sets up gScreenBounds
            if (!sGLContext) {
                LOG("Failed to create GL context for fb, trying /dev/graphics/fb0");

                // We can't delete gNativeWindow.

                nsIntSize screenSize;
                sFramebufferOpen = Framebuffer::Open(&screenSize);
                gScreenBounds = nsIntRect(nsIntPoint(0, 0), screenSize);
                if (!sFramebufferOpen) {
                    LOG("Failed to mmap fb(?!?), aborting ...");
                    NS_RUNTIMEABORT("Can't open GL context and can't fall back on /dev/graphics/fb0 ...");
                }
            }
        }

        char propValue[PROPERTY_VALUE_MAX];
        property_get("ro.sf.hwrotation", propValue, "0");
        sPhysicalScreenRotation = atoi(propValue) / 90;

        // Unlike nsScreenGonk::SetRotation(), only support 0 and 180 as there
        // are no known screens that are mounted at 90 or 270 at the moment.
        switch (sPhysicalScreenRotation) {
        case nsIScreen::ROTATION_0_DEG:
            break;
        case nsIScreen::ROTATION_180_DEG:
            sRotationMatrix.Translate(gfxPoint(gScreenBounds.width,
                                               gScreenBounds.height));
            sRotationMatrix.Rotate(M_PI);
            break;
        default:
            MOZ_NOT_REACHED("Unknown rotation");
            break;
        }
        sVirtualBounds = gScreenBounds;

        nsAppShell::NotifyScreenInitialized();
    }
}