On 08/23/2011 07:32 AM, Wayne Stambaugh wrote: > >> Then we have to decide on how to load the PNG files into the programs, and >> there >> seem to be at least two ways to do this: >> >> >> A) read the *.PNG files into memory from disk at program start time. >> >> B) convert the *.PNG files into a BYTE array which is compiled into the >> respective program. But the byte array is definitely a PNG format, meaning >> we >> get the advantage of the alpha channel support, which we do not currently >> have. > C) Zip all the *.PNG files into an archive and use wxInputStream to access the > archive like a file system. > > My preference is B but I'm not sure exactly how you would access the byte > arrays directly with wxBitmap or wxImage.
http://wiki.wxwidgets.org/Embedding_PNG_Images tells how. The C program they are using to convert the *.png file to a byte array is nothing, and can be done in Cmake scripting lingo as I said. I also prefer B), which lets the linker do the determination ahead of time as to which bitmaps are needed by which program. There is difficulty using the C program to do this, when cross compiling, assuming you want that C program to be built with CMake. Therefore I suggested using a *.cmake script to do it. The CMake script should at least: 1) convert each *.png file to a *.cpp file. 2) remember each *.png file that it converted, and output a single header file. the header file needs to have "per bitmap" entries in it. case 1) either this: extern unsigned char GBM_rotate_neg_X[]; #define GBM_rotate_neg_X_SIZE; extern unsigned char GBM_rotate_pos_Y[]; #define GBM_rotate_pos_Y_SIZE; : or this: case 2) this: extern wxBitmap* GPM_rotate_neg_X; // @todo look into no pointer, but instance extern wxBitmap* GPM_rotate_pos_Y; In case 2) the *.cmake script can simply write code for each *.png file to construct the bitmap in the bitmap specific *.cpp file, which goes into the bitmap library: ------------------------------------------------------------------ #include "bitmaps.h" #include <wxBitmap.h> static unsigned char bytes[] = { 0xab, 0xcd, ...}; wxBitmap* GPM_rotate_neg_X = MakeBitmap( bytes, sizeof(bytes) ); ------------------------------------------------------------------- Then you put those into the bitmap library. For the new common function: static bool usingPNG; wxBitmap* MakeBitmap( unsigned char* bytes, int byteCount ) { if( !usingPNG ) { usingPNG = true; wxImage.AddHandler( New wxPNGHandler ) // other oneshot stuff. } return wxBitmap( as per the wiki entry ); } //////////////////// So, can Windows wxWidgets be taught to support PNG? _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
