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[STR New] Link: http://www.fltk.org/str.php?L2520 Version: 1.3.0 Why not that we are talking about load image from memory, add this too: (I've got this from the fltk forum so credits should be given to jseb, http://fltk.org/newsgroups.php?s1+gfltk.general+v13+T0+Qjseb) ----Fl_PNG_Image.H struct Png_infos { char name_png[256]; int offset_png; //where we stopped last time we read the "file" unsigned char *datas_png; }; class Fl_PNG_Memory_Image : public Fl_RGB_Image { public: Fl_PNG_Memory_Image(const char *name_png, unsigned char *buffer_png); int get_png_h() { return this->h(); } int get_png_w() { return this->w(); } private: Png_infos png_infos; }; ---- ---Fl_PNG_Image.cxx static void png_read_data_from_mem( png_structp png_ptr, //pointer on struct which contains addy on our source datas. png_bytep data, //pointer on the dest buffer we have to fill png_size_t length); //nbr of bytes to read this time /* when we create the class, we have to pass a pointer on the beginning of the PNG file in memory we pass also the original name of the png, for error logging purpose */ Fl_PNG_Memory_Image::Fl_PNG_Memory_Image (const char *name_png, unsigned char *buffer_png): Fl_RGB_Image(0,0,0) { int i; // Looping var int channels; // Number of color channels png_structp pp; // PNG read pointer png_infop info; // PNG info pointers png_bytep *rows; // PNG row pointers //prepare the struct png_infos.offset_png=0; png_infos.datas_png = buffer_png; // Setup the PNG data structures... pp = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); info = png_create_info_struct(pp); if (setjmp(pp->jmpbuf)) { Fl::warning("PNG file \"%s\" contains errors!\n", name_png); return; } // Initialize the function pointer to the PNG read "engine"... // png_set_read_fn (pp, (png_voidp) buffer_png, png_read_data_from_mem); png_set_read_fn (pp, (png_voidp) &png_infos, png_read_data_from_mem); //TODO : impl�menter png_check_sig // Get the image dimensions and convert to grayscale or RGB... png_read_info(pp, info); if (info->color_type == PNG_COLOR_TYPE_PALETTE) png_set_expand(pp); if (info->color_type & PNG_COLOR_MASK_COLOR) channels = 3; else channels = 1; if ((info->color_type & PNG_COLOR_MASK_ALPHA) || info->num_trans) channels ++; w((int)(info->width)); h((int)(info->height)); d(channels); if (info->bit_depth < 8) { png_set_packing(pp); png_set_expand(pp); } else if (info->bit_depth == 16) png_set_strip_16(pp); # if defined(HAVE_PNG_GET_VALID) && defined(HAVE_PNG_SET_TRNS_TO_ALPHA) // Handle transparency... if (png_get_valid(pp, info, PNG_INFO_tRNS)) png_set_tRNS_to_alpha(pp); # endif // HAVE_PNG_GET_VALID && HAVE_PNG_SET_TRNS_TO_ALPHA array = new uchar[w() * h() * d()]; alloc_array = 1; // Allocate pointers... rows = new png_bytep[h()]; for (i = 0; i < h(); i ++) rows[i] = (png_bytep)(array + i * w() * d()); // Read the image, handling interlacing as needed... for (i = png_set_interlace_handling(pp); i > 0; i --) png_read_rows(pp, rows, NULL, h()); #ifdef WIN32 // Some Windows graphics drivers don't honor transparency when RGB == white if (channels == 4) { // Convert RGB to 0 when alpha == 0... uchar *ptr = (uchar *)array; for (i = w() * h(); i > 0; i --, ptr += 4) if (!ptr[3]) ptr[0] = ptr[1] = ptr[2] = 0; } #endif // WIN32 // Free memory and return... delete[] rows; png_read_end(pp, info); png_destroy_read_struct(&pp, &info, NULL); } static void png_read_data_from_mem( png_structp png_ptr, //pointer on struct which contains pointer on our datas png_bytep data, //where you have to copy the sources datas for libpng computing png_size_t length) //length of datas to copy { Png_infos *pnginfo = (Png_infos *)png_get_io_ptr (png_ptr); //get the pointer on our struct unsigned char *src = &pnginfo->datas_png[pnginfo->offset_png]; /* copy data from image buffer */ memcpy (data, src, length); /* advance in the file */ pnginfo->offset_png += length; } Link: http://www.fltk.org/str.php?L2520 Version: 1.3.0
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