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getThumbnail

Declaration

extern "C" status_t getThumbnail(BBitmap* &);

Description

This function is entirely optional. The function should download from the camera the thumbnail for the current working image. The function returns a status_t error code to indicate the success of the operation. Any of the status_t error codes can be used, but it is suggested that you stick to using B_NO_ERROR for success and B_ERROR for failure. The function is passed an uninitialised BBitmap object. It is the responsibility of the plugin to allocate the necessary memory for the thumbnail. The thumbnail can also be initialised to any dimensions, but should be B_RGB32 color space.

Example Implementation - Kodak DC210 Plugin

status_t getThumbnail(BBitmap* & bitmap) { //New up the bitmap, in this case to 96x72 pixels bitmap = new BBitmap(BRect(0,0,95,71), B_RGB32); int receivelength = 1024; char* temp2; //Send the command to get the thumbnail ComPort->Write("\x66\x00", 2); temp2 = (char*)(currentpicturenumber >> 8); ComPort->Write(&temp2,1); temp2 = (char*)(currentpicturenumber >> 0); ComPort->Write(&temp2,1); ComPort->Write("\x00",1); ComPort->Write("\x00\x00\x1A",3); //Allocate memory for the buffers unsigned char *buffer = new unsigned char[receivelength]; unsigned char *buffer2 = new unsigned char[7000]; unsigned char *cfa = new unsigned char[3456]; unsigned char *rgb = new unsigned char[20736]; bool pending = true; int z=0; ComPort->Read(buffer,1); while (buffer[0] == 0xf0) ComPort->Read(buffer,1); if (buffer[0] == 0xe2) return(B_ERROR); else if (buffer[0] == 0xd1) { do { //Read in thumbnail data into buffer ComPort->Read(buffer,1); while (buffer[0] == 0xf0) ComPort->Read(buffer,1); if (buffer[0] == 0x01) { pending = true; receivepacket(buffer,receivelength, true); memcpy(buffer2+z, buffer,receivelength); z+=receivelength; } else pending = false; } while (pending); if (buffer[0] == 0x00) { memcpy(cfa,buffer2, 3456); //Convert into rgb from camera data cfa2rgb(cfa, rgb, 96, 72); //Put the data into the bitmap SetBits(rgb, 20736, 0, B_RGB32); snooze(50000); return(B_NO_ERROR); } else return(B_ERROR); } else return(B_ERROR); }