Example mac CoreGraphics draw function for FireBreath

BitBlitter.cpp

// Platform independent


#include "BitBlitter.h"
#include "precompiled_headers.h" // Anything before this is PCH on windows

bool BitBlitter::onWindowRefresh( FB::RefreshEvent *evt, FB::PluginWindow *win )
{
    boost::mutex::scoped_lock _l(preview_mutex);

    if (preview_width > 0 && preview_height > 0 && preview_image) {
        drawImage(win, evt, preview_image.get(), preview_width, preview_height, preview_gray);
    }
    return true;
}

void BitBlitter::setPreviewImage( const boost::shared_array<uint8_t>& img, const int width, const int height, bool gray )
{
    boost::mutex::scoped_lock _l(preview_mutex);
    preview_width = width;
    preview_height = height;
    preview_image = img;
    preview_gray = gray;
}

BitBlitter.h

class BitBlitter : public FB::PluginEventSink
{
public:
    BitBlitter() {}
    virtual ~BitBlitter() {}
    virtual void drawImage(FB::PluginWindow *wnd, FB::PluginEvent* evt, unsigned char *img, int width, int height, bool gray = false) = 0;
    virtual void setPreviewImage(const boost::shared_array<uint8_t>& img, const int width, const int height, bool gray = false);

    BEGIN_PLUGIN_EVENT_MAP()
        EVENTTYPE_CASE(FB::RefreshEvent, onWindowRefresh, FB::PluginWindow)
    END_PLUGIN_EVENT_MAP()

    virtual bool onWindowRefresh(FB::RefreshEvent *evt, FB::PluginWindow *win);
private:
    boost::mutex preview_mutex;
    boost::shared_array<uint8_t> preview_image;
    int preview_width;
    int preview_height;
    bool preview_gray;
};

BitBlitterMac.cpp

#include "PluginEvents/DrawingEvents.h"

void BitBlitterMac::drawImage(FB::PluginWindow *, FB::PluginEvent* evt, unsigned char *img, int width, int height, bool gray) {
    FB::CoreGraphicsDraw* e(static_cast<FB::CoreGraphicsDraw*>(evt));

    CGContext* context = e->context;
    if(context==NULL) {
        printf("Error: no coregraphics context to draw to.\n");
        return;
    }

    int win_width = e->bounds.right - e->bounds.left;
    int win_height = e->bounds.bottom - e->bounds.top;
    if((width<=1)||(height<=1)) return;
    if((width<=1)||(height<=1)) return;

    CGContextSaveGState(context);

    cf_scoped_ptr<CGColorSpaceRef> colorSpace;
    cf_scoped_ptr<CGContextRef> bitmapContext;
    if (!gray) {
        colorSpace.reset(CGColorSpaceCreateDeviceRGB());
        bitmapContext.reset(CGBitmapContextCreate(
                img,
                width,
                height,
                8, // bitsPerComponent
                4*width, // bytesPerRow
                colorSpace,
                kCGImageAlphaNoneSkipLast));
    } else {
        colorSpace.reset(CGColorSpaceCreateDeviceGray());
        bitmapContext.reset(CGBitmapContextCreate(
                img,
                width,
                height,
                8, // bitsPerComponent
                width, // bytesPerRow
                colorSpace,
                kCGImageAlphaNone));
    }

    cf_scoped_ptr<CGImageRef> cgImage(CGBitmapContextCreateImage(bitmapContext));
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextTranslateCTM(context, 0, win_height);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextDrawImage(context, CGRectMake(0, 0, win_width, win_height), cgImage);


    CGContextRestoreGState(context);
}

BitBlitterWin.cpp

#include "Win/BitBlitterWin.h"

#include "Win/PluginWindowWin.h"
#include "Win/PluginWindowlessWin.h"

void BitBlitterWin::drawImage(FB::PluginWindow *wnd, FB::PluginEvent* evt, unsigned char *img, int width, int height, bool gray) {
    HDC hdc=NULL;

    BITMAPINFO bitmapInfo;
    bitmapInfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
    bitmapInfo.bmiHeader.biBitCount=32;
    bitmapInfo.bmiHeader.biCompression=BI_RGB;
    bitmapInfo.bmiHeader.biPlanes = 1;
    bitmapInfo.bmiHeader.biSizeImage = width*height*4;
    bitmapInfo.bmiHeader.biWidth = width;
    bitmapInfo.bmiHeader.biHeight = height;

    OutputDebugString(L"bitBlt\n");

    FB::PluginWindowWin *winwin = dynamic_cast< FB::PluginWindowWin *>(wnd);
    if(winwin!=NULL) {
        PAINTSTRUCT ps;
        hdc = BeginPaint(winwin->getHWND(), &ps);
        if(hdc==NULL) return;
        int dstWidth = wnd->getWindowWidth();
        int dstHeight = wnd->getWindowHeight();

        SetStretchBltMode(hdc, HALFTONE);
        StretchDIBits(hdc, 0, dstHeight, dstWidth, -dstHeight, 0,0, width, height, img, &bitmapInfo,DIB_RGB_COLORS,SRCCOPY);

        EndPaint(winwin->getHWND(), &ps);
    }

    FB::PluginWindowlessWin *windowlesswin = dynamic_cast< FB::PluginWindowlessWin *>(wnd);
    if(windowlesswin!=NULL) {
        hdc=windowlesswin->getHDC();
        FB::Rect r = wnd->getWindowPosition();
        int dstWidth = wnd->getWindowWidth();
        int dstHeight = wnd->getWindowHeight();

        SetStretchBltMode(hdc, HALFTONE);
        StretchDIBits(hdc, r.left, r.bottom, dstWidth, -dstHeight, 0,0, width, height, img, &bitmapInfo,DIB_RGB_COLORS,SRCCOPY);

        if(hdc==NULL) return;
    }

    OutputDebugString(L"bitBlt end\n");
}

BitBlitterWin.hpp

#ifndef BITBLITTERWIN_H
#define BITBLITTERWIN_H

#include "BitBlitter.h"

class BitBlitterWin : public BitBlitter {
    virtual void drawImage(FB::PluginWindow *, FB::PluginEvent* evt, unsigned char *img, int width, int height, bool gray = false);
};


#endif

Plugin.cpp

// If you do something like this, you can handle the draw events in your blitter object

Plugin::Plugin() {
    // As an example
#ifdef FB_WIN
    bitBlitter = new BitBlitterWin();
#endif
#ifdef FB_MACOSX
    bitBlitter = new BitBlitterMac();
#endif
}

bool Plugin::onWindowAttached(FB::AttachedEvent *evt, FB::PluginWindow *wnd)
{
    FBLOG_INFO("GCPlugin", "Window attached");
    wnd->AttachObserver(bitBlitter); // Attach the window to the bitBlitter
    return true;
}

bool Plugin::onWindowDetached(FB::DetachedEvent *evt, FB::PluginWindow *wnd)
{
    FBLOG_INFO("GCPlugin", "Window detached");
    wnd->DetachObserver(bitBlitter); // Detach the window from the bitBlitter
    return true;
}

// Note that the bitBlitter will also get attached and detached events when those lines execute.

// BitBlitterWin.cpp
FB::PluginWindowlessWin *windowlesswin = dynamic_cast< FB::PluginWindowlessWin *>(wnd);
if(windowlesswin!=NULL) {
hdc=windowlesswin->getHDC();
FB::Rect r = wnd->getWindowPosition(); // Here is wrong for IE
....
When we call pluginWIndow->InvalidateWindow(), IE 's bounds is changed every time, the right way to get draw bounds is :
FB::Rect r = evt->bounds;
Hope this fix can help someone.