bitmapdata是FlasCC官方例子02_Interop中的例子。这例子比起c++interop来说，多了一个鼠标事件监听。
我们逐行分析一下吧。
#include <AS3/AS3.h>
#include <Flash++.h>using namespace AS3::ui;
static const int COORDBITS = 7; // 7 bits => dim of 128
static const int DIM = 1 << COORDBITS;这个函数主要是根据一个给出的offset值，返回一个计算后的值
static int swizzleOffset(int offs)
{ int result = 0; int coordBits = COORDBITS; int offsHi = offs >> COORDBITS; // take the higher order bits int coordBits2 = COORDBITS * 2; while(coordBits--) { // put the lowest bit in the "lo" offset bits // into the highest bit of the result... // it'll get shifted into a lower position // as the loop executes result |= ((offs & 1) << coordBits2); offs >>= 1; result >>= 1; // same for the "hi" offset bits result |= ((offsHi & 1) << coordBits2); offsHi >>= 1; result >>= 1; } return result; }
// 将一个图像的像素进行混淆
static void swizzlePixels(unsigned *dst, unsigned *src) { int offs = DIM * DIM;while(offs--)
{ int swiz = swizzleOffset(offs); dst[swiz] = src[offs]; } }
//监听鼠标点击事件，然后混淆BitmapData的像素值
static var mouseDownHandler(void *arg, var args) { flash::events::MouseEvent event = flash::events::MouseEvent(args[0]); flash::display::Sprite sprite = flash::display::Sprite(event->target); // the container Sprite flash::display::Bitmap bitmap = flash::display::Bitmap(sprite->getChildAt(0)); // Bitmap is the only child flash::display::BitmapData bitmapData = bitmap->bitmapData; // ByteArray corresponding to our ram! // C ptrs are equivalent to offsets into this ByteArray flash::utils::ByteArray ram = internal::get_ram();// allocate space for the pixels
unsigned *src = new unsigned[DIM * DIM]; unsigned *dst = new unsigned[DIM * DIM]; // copy current pixels directly to ram bitmapData->copyPixelsToByteArray(bitmapData->rect, ram, src); // swizzle them! swizzlePixels(dst, src); // write new pixels directly from ram bitmapData->setPixels(bitmapData->rect, ram, dst); // clean up delete dst; delete src; return internal::_undefined; }
int main()
{ //取得舞台 flash::display::Stage stage = internal::get_Stage();//创建一个Shape
flash::display::Shape myShape = flash::display::Shape::_new(); flash::display::Graphics graphics = myShape->graphics;//绘制简单的图形 这是一个像把子一样的圆
graphics->beginFill(0xff00ff, 0.5);
graphics->drawCircle(64.0, 64.0, 64.0); graphics->endFill(); graphics->beginFill(0xffff00, 0.5); graphics->drawCircle(64.0, 64.0, 40.0); graphics->endFill(); graphics->beginFill(0x00ffff, 0.5); graphics->drawCircle(64.0, 64.0, 16.0); graphics->endFill();//创建一个BitmapData
flash::display::BitmapData myBitmapData = flash::display::BitmapData::_new(DIM, DIM); //把图形绘制到这个bitmapdata上myBitmapData->draw(myShape);
// 创建一个Bitmap
flash::display::Bitmap myBitmap = flash::display::Bitmap::_new(myBitmapData);
// 加到一个Sprite中，以便显示
flash::display::Sprite mySprite = flash::display::Sprite::_new();
mySprite->addChild(myBitmap);
// 增加一个鼠标监听器 mySprite->addEventListener("mouseDown", Function::_new(&mouseDownHandler, NULL)); // 添加到舞台 stage->addChild(mySprite);// 这个函数将会使C++与AS3进行同步，以使可以处理鼠标事件。
AS3_GoAsync();// 因为运行机制的原因，这行代码是无法到达的。
return 0; }还是上个图吧。