C++ ANPCanvasInterfaceV0::newCanvas方法代码示例

ANPCanvas* PaintPlugin::getCanvas(ANPRectI* dirtyRect) {

    ANPBitmap bitmap;
    JNIEnv* env = NULL;
    if (!m_surface || gVM->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK ||
        !gSurfaceI.lock(env, m_surface, &bitmap, dirtyRect)) {
            return NULL;
        }

    ANPCanvas* canvas = gCanvasI.newCanvas(&bitmap);

    // clip the canvas to the dirty rect b/c the surface is only required to
    // copy a minimum of the dirty rect and may copy more. The clipped canvas
    // however will never write to pixels outside of the clipped area.
    if (dirtyRect) {
        ANPRectF clipR;
        clipR.left = dirtyRect->left;
        clipR.top = dirtyRect->top;
        clipR.right = dirtyRect->right;
        clipR.bottom = dirtyRect->bottom;
        gCanvasI.clipRect(canvas, &clipR);
    }

    return canvas;
}

void BackgroundPlugin::drawPlugin(int surfaceWidth, int surfaceHeight) {

    // get the plugin's dimensions according to the DOM
    PluginObject *obj = (PluginObject*) inst()->pdata;
    const int W = obj->window->width;
    const int H = obj->window->height;

    // compute the current zoom level
    const float zoomFactorW = static_cast<float>(surfaceWidth) / W;
    const float zoomFactorH = static_cast<float>(surfaceHeight) / H;

    // check to make sure the zoom level is uniform
    if (zoomFactorW + .01 < zoomFactorH && zoomFactorW - .01 > zoomFactorH)
        gLogI.log(kError_ANPLogType, " ------ %p zoom is out of sync (%f,%f)",
                  inst(), zoomFactorW, zoomFactorH);

    // scale the variables based on the zoom level
    const int fontSize = (int)(zoomFactorW * 16);
    const int leftMargin = (int)(zoomFactorW * 10);

    // lock the surface
    ANPBitmap bitmap;
    JNIEnv* env = NULL;
    if (!m_surface || gVM->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK ||
        !gSurfaceI.lock(env, m_surface, &bitmap, NULL)) {
        gLogI.log(kError_ANPLogType, " ------ %p unable to lock the plugin", inst());
        return;
    }

    // create a canvas
    ANPCanvas* canvas = gCanvasI.newCanvas(&bitmap);
    gCanvasI.drawColor(canvas, 0xFFFFFFFF);

    ANPPaint* paint = gPaintI.newPaint();
    gPaintI.setFlags(paint, gPaintI.getFlags(paint) | kAntiAlias_ANPPaintFlag);
    gPaintI.setColor(paint, 0xFFFF0000);
    gPaintI.setTextSize(paint, fontSize);

    ANPTypeface* tf = gTypefaceI.createFromName("serif", kItalic_ANPTypefaceStyle);
    gPaintI.setTypeface(paint, tf);
    gTypefaceI.unref(tf);

    ANPFontMetrics fm;
    gPaintI.getFontMetrics(paint, &fm);

    gPaintI.setColor(paint, 0xFF0000FF);
    const char c[] = "This is a background plugin.";
    gCanvasI.drawText(canvas, c, sizeof(c)-1, leftMargin, -fm.fTop, paint);

    // clean up variables and unlock the surface
    gPaintI.deletePaint(paint);
    gCanvasI.deleteCanvas(canvas);
    gSurfaceI.unlock(env, m_surface);
}

void AudioPlugin::drawPlugin(const ANPBitmap& bitmap, const ANPRectI& clip) {
    ANPCanvas* canvas = gCanvasI.newCanvas(&bitmap);

    ANPRectF clipR;
    clipR.left = clip.left;
    clipR.top = clip.top;
    clipR.right = clip.right;
    clipR.bottom = clip.bottom;
    gCanvasI.clipRect(canvas, &clipR);

    draw(canvas);
    gCanvasI.deleteCanvas(canvas);
}