C++ Fl_Image::data方法代码示例

void Flcc_ValueBox::generate()
{
    int X = 0, Y = 0, W = w(), H = h();
    box()->inset(X,Y,W,H);

    Fl_Image *im = new Fl_Image(W, H, 32);

    uint32 *dst = (uint32*)im->data();
    uint32 rgb;
    int skip = (im->pitch() - W * im->bytespp()) >> 2;

    for(int y = 0; y < H; y++) {

        float Yf = 255*(1.0-float(y)/H);
        fl_rgb888_from_rgb(rgb, uchar(tr*Yf+.5f), uchar(tg*Yf+.5f), uchar(tb*Yf+.5f));

        for(int x = 0; x < W; x++) {
            *dst++ = rgb;
        }

        dst += skip;
    }
    if(bg) delete bg;
    bg = im;
}

Fl_Image *make_bg(int w, int h)
{
#ifdef GENERATE_16BIT
    Fl_Image *ret = new Fl_Image(w, h, 16, 0, true, 0x0000F000, 0x00000F00, 0x000000F0, 0x0000000F);
#else
    Fl_Image *ret = new Fl_Image(w, h, 32, 0, true, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
#endif

    printf("BG Format:\n Rmask: 0x%08x\n Gmask: 0x%08x\n Bmask: 0x%08x\n", ret->format()->Rmask, ret->format()->Gmask, ret->format()->Bmask);

    // pitch = WORD alignment bits per line
    int pitch=Fl_Renderer::calc_pitch(ret->format()->bytespp, w);
    int skip = pitch - w * ret->format()->bytespp;

    uint8 *p = ret->data();
    uint8 r,g,b;

    for (int y = 0; y < h; y++) {
        double Y = double(y)/(h-1);
        for (int x = 0; x < w; x++) {
            double X = double(x)/(w-1);
            r = uchar(255*((1-X)*(1-Y))); // red in upper-left
            g = uchar(255*((1-X)*Y));	// green in lower-left
            b = uchar(255*(X*Y));	// blue in lower-right
            fl_assemble_rgb(p,
                            ret->format()->bytespp, ret->format(),
                            r, g, b);
            p+=ret->format()->bytespp;
        }
        p+=skip;
    }
    return ret;
}

/* =============================================================================
 =============================================================================== */
int C3DSceneMgr::createUITexture(string strFileName, int &width, int &height, int &txWidth)
{
	Fl_Image * img = openTextureFile(strFileName);
	if (img == NULL) {
		return -1;
	}

	width = img->w();
	height = img->h();

	//  need to add an alpha channel to properly overlay on existing textures
	const unsigned char *pData = NULL;
	if (img->d() == 3)
		pData = makeRGBA((const unsigned char *) img->data()[0], width, height);
	else
		pData = (const unsigned char *) img->data()[0];

	GLuint	textureID;
	glGenTextures(1, &textureID);
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
	glBindTexture(GL_TEXTURE_2D, textureID);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

	int txHeight = height;
	txWidth = (width <= 64) ? 64 : (width <= 128) ? 128 : width;

	const unsigned char *pDataNew = NULL;
	if (width != txWidth)
	{
		pDataNew = padOut(pData, width, height, txWidth);
		txHeight = txWidth;
	}

	glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); 
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, txWidth, txHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, pDataNew ? pDataNew : pData);

	if (pDataNew) delete[] pDataNew;
	if (img->d() == 3) delete[] pData;
	delete img;

	return textureID;
}

Fl_Image *Fl_Image_Filter::apply_to_new(Fl_Image *image, Fl_Rect *rect, Fl_Image_Filter *filter, float val1, float val2, float val3)
{
    Fl_Rect r(0,0,image->width(),image->height());
    if(!rect) { rect = &r; }
    Fl_Image *ret = new Fl_Image(*image);

    uint8 *data = ret->data();
    if(!filter->execute(&data, *rect, ret->pitch(), ret->format(), val1, val2, val3)) {
        delete ret;
        return 0;
    }
    return ret;
}

Fl_Image *Fl_Image::scale(int W, int H)
{
    Fl_Image *ret = new Fl_Image(W, H, bitspp());
    ret->format()->copy(format());

    Fl_Rect olds(0,0,width(),height()); Fl_Rect news(0,0,W,H);
    bool success = Fl_Renderer::stretch(m_data, bytespp(), pitch(), &olds,
                                        ret->data(), bytespp(), ret->pitch(), &news);
    if(!success) {
        delete ret;
        ret = 0;
    }
    return ret;
}

/* =============================================================================
 =============================================================================== */
int C3DSceneMgr::createTexture(string strFileName, int &width, int &height, int iTxMode)
{
	if (strFileName == "") //  Return from the function if no file name was passed in
		return -1;
	if (!fileexists(strFileName))
		return -1;

	//  Load the image and store the data
	int textureID = -1;
	if (getExt(strFileName) == ".dds")
	{
		DDS_IMAGE_DATA	*pDDSImageData = NULL;
		if ((pDDSImageData = loadDDSTextureFile(strFileName)) != NULL)
		{
			textureID = createTextureDDS(pDDSImageData);
			height = pDDSImageData->sizeY;
			width = pDDSImageData->sizeX;
		}
		else	//  case where worldwind wraps jpegs in dds files
		{
			Fl_RGB_Image *img = new Fl_JPEG_Image(strFileName.c_str());
			if (img->d() == 0)
				return -1;
			width = img->w();
			height = img->h();
			const unsigned char *pData = (const unsigned char *) img->data()[0];
			textureID = createTexture(pData, width, height, GL_RGB, GL_RGB, iTxMode);
			delete img;
		}
	}
	else
	{
		Fl_Image * img = openTextureFile(strFileName);
		if (img == NULL)
			return -1;
		width = img->w();
		height = img->h();
		const unsigned char *pData = (const unsigned char *) img->data()[0];
		textureID = createTexture(pData, width, height, img->d() == 4 ? GL_RGBA : GL_RGB, GL_RGBA, iTxMode);
		delete img;
	}

	return textureID;
}

    virtual Bitmap *Load(IStream *stream) {
        SPADES_MARK_FUNCTION();

        // read all
        std::string data = stream->ReadAllBytes();

        // copy to buffer
        Fl_Image *img = LoadFltkImage(data);

        SPAssert(img);
        SPAssert(img->count() >= 1);

        const unsigned char* inPixels =
            (const unsigned char *)img->data()[0];
        int depth = img->d();
        int width = img->w();
        int height = img->h();
        int pitch = width * depth + img->ld();

        Handle<Bitmap> bmp;
        try {
            bmp = new Bitmap(width, height);
        } catch(...) {
            delete img;
            throw;
        }
        try {
            unsigned char *outPixels = (unsigned char *)bmp->GetPixels();

            if(pitch == width * 4 && depth == 4) {
                // if the format matches the requirement of Bitmap,
                // just use it
                memcpy(outPixels, inPixels, pitch * height);
            } else {
                // convert
                const unsigned char* line;
                for(int y = 0; y < height; y++) {
                    line = inPixels;
                    for(int x = 0; x < width; x++) {
                        uint8_t r, g, b, a;
                        switch(depth) {
                        case 1:
                            r = g = b = *(line++);
                            a = 255;
                            break;
                        case 2:
                            r = g = b = *(line++);
                            a = *(line++);
                            break;
                        case 3:
                            r = *(line++);
                            g = *(line++);
                            b = *(line++);
                            a = 255;
                            break;
                        case 4:
                            r = *(line++);
                            g = *(line++);
                            b = *(line++);
                            a = *(line++);
                            break;
                        default:
                            SPAssert(false);
                        }
                        *(outPixels++) = r;
                        *(outPixels++) = g;
                        *(outPixels++) = b;
                        *(outPixels++) = a;
                    }
                    inPixels += pitch;
                }
            }
            delete img;
            return bmp.Unmanage();
        } catch(...) {
            delete img;
            throw;
        }
    }

WPaper *make_image(Fl_Color bg_color,
                     Fl_Image *im,
                     int w, int h,
                     int mode,
                     uchar opacity=255)
{
    // secret box render function from Fl_Image :)
    extern uint8 *render_box(int w, int h, int bitspp, uint color, Fl_Colormap *pal, uint8 *buffer);

    Fl_PixelFormat *fmt = Fl_Renderer::system_format();
    WPaper *bg_image = new WPaper(w, h, Fl_Renderer::system_format());

    int iw=im->width(), ih=im->height();
    int ix=0, iy=0;
    int xoff=0, yoff=0;
    Fl_Image *newim = im;

    switch(mode) {
    //CENTER
    case 0: {
        ix=(w/2)-(iw/2);
        iy=(h/2)-(ih/2);
        if(ix<0) xoff=-ix; if(iy<0) yoff=-iy;
        if(ix<0) ix=0; if(iy<0) iy=0;
    }
    break;

    //STRECH
    case 1: {
        ix=0, iy=0, iw=w, ih=h;
        if(w!=im->width()||h!=im->height()) {
            newim = im->scale(w,h);
        }
    }
    break;

    //STRETCH ASPECT
    case 2: {
        int pbw = w, pbh = h;
        iw = pbw;
        ih = iw * im->height() / im->width();
        if(ih > pbh) {
            ih = pbh;
            iw = ih * im->width() / im->height();
        }
        ix=(w/2)-(iw/2), iy=(h/2)-(ih/2);
        if(ix<0) ix=0; if(iy<0) iy=0;
        if(iw>w) iw=w; if(ih>h) ih=h;
        if(iw!=im->width()||ih!=im->height()) {
            newim = im->scale(iw,ih);
        }
    }
    break;
    }

    // This could be an option, opacity
    newim->format()->alpha = opacity;

    if( (iw<w || ih<h) || newim->format()->alpha!=255) {
        // If image doesnt fill the whole screen, or opacity < 255
        // fill image first with bg color.
        render_box(w, h, fmt->bitspp, bg_color, fmt->palette, bg_image->data());
    }

    if(iw>w) iw=w; if(ih>h) ih=h;
    Fl_Rect r(xoff, yoff, iw, ih);
    Fl_Rect r2(ix,iy, iw, ih);

    if(newim->format()->alpha>0) {
        // Blit image data to our bg_image
        bg_image->check_map(newim->format());
        Fl_Renderer::alpha_blit(newim->data(), &r, newim->format(), newim->pitch(),
                                bg_image->data(), &r2, bg_image->format(), bg_image->pitch(),
                                0);
    }

    if(newim!=im)
        delete newim;

    return bg_image;
}

Fl_Image *make_ball(int radius)
{
    uint8  trans, alphamask;
    int    range, addition;
    int    xdist, ydist;
    uint16 x, y;
    uint16 skip;
    uint32 pixel;
    Fl_Image *light;

#ifdef GENERATE_16BIT
    uint16 *buf;
    /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
    /* Note: this isn't any faster than a 32 bit alpha surface */
    alphamask = 0x0000000F;
    light = new Fl_Image(2*radius, 2*radius, 16, 0, true,
                         0x0000F000, 0x00000F00, 0x000000F0, alphamask);
#else
    uint32 *buf;
    /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
    alphamask = 0x000000FF;
    light = new Fl_Image(2*radius, 2*radius, 32, 0, true,
                         0xFF000000, 0x00FF0000, 0x0000FF00, alphamask);
#endif

    /* Fill with a light yellow-orange color */
    skip = light->pitch()-(light->width()*light->format()->bytespp);
#ifdef GENERATE_16BIT
    buf = (uint16 *)light->data();
#else
    buf = (uint32 *)light->data();
#endif
    /* Get a tranparent pixel value - we'll add alpha later */
    pixel = light->format()->map_rgba(0xFF, 0xDD, 0x88, 0);
    for ( y=0; y<light->height(); ++y ) {
        for ( x=0; x<light->width(); ++x ) {
            *buf++ = pixel;
        }
        buf += skip;	/* Almost always 0, but just in case... */
    }

    /* Calculate alpha values for the surface. */
#ifdef GENERATE_16BIT
    buf = (uint16 *)light->data();
#else
    buf = (uint32 *)light->data();
#endif
    for ( y=0; y<light->height(); ++y ) {
        for ( x=0; x<light->width(); ++x ) {
            /* Slow distance formula (from center of light) */
            xdist = x-(light->width()/2);
            ydist = y-(light->height()/2);
            range = (int)sqrt(xdist*xdist+ydist*ydist);

            /* Scale distance to range of transparency (0-255) */
            if ( range > radius ) {
                trans = alphamask;
            } else {
                /* Increasing transparency with distance */
                trans = (uint8)((range*alphamask)/radius);

                /* Lights are very transparent */
                addition = (alphamask+1)/16;
                if ( (int)trans+addition > alphamask ) {
                    trans = alphamask;
                } else {
                    trans += addition;
                }
            }
            /* We set the alpha component as the right N bits */
            *buf++ |= (255-trans);
        }
        buf += skip;	/* Almost always 0, but just in case... */
    }

    return light;
}