From 5e2a1bc9e56003349e533f7e5841041ba5c04e28 Mon Sep 17 00:00:00 2001 From: "N.N." Date: Tue, 4 Oct 2005 02:02:15 +0000 Subject: starting to commit gridflow 0.8.0 ... if you know how to use "cvs import" please mail me and i'll use it for 0.8.1 svn path=/trunk/; revision=3646 --- externals/gridflow/format/png.c | 138 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 externals/gridflow/format/png.c (limited to 'externals/gridflow/format/png.c') diff --git a/externals/gridflow/format/png.c b/externals/gridflow/format/png.c new file mode 100644 index 00000000..69a0254e --- /dev/null +++ b/externals/gridflow/format/png.c @@ -0,0 +1,138 @@ +/* + $Id: png.c,v 1.1 2005-10-04 02:02:15 matju Exp $ + + GridFlow + Copyright (c) 2001,2002,2003,2004 by Mathieu Bouchard + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + See file ../COPYING for further informations on licensing terms. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +/* !@#$ not handling abort on compress */ +/* !@#$ not handling abort on decompress */ + +#include "../base/grid.h.fcs" +extern "C" { +#include +}; + +\class FormatPNG < Format +struct FormatPNG : Format { + P bit_packing; + png_structp png; + png_infop info; + int fd; + FILE *f; + FormatPNG () : bit_packing(0), png(0), f(0) {} + \decl Ruby frame (); + \decl void initialize (Symbol mode, Symbol source, String filename); + \grin 0 int +}; + +GRID_INLET(FormatPNG,0) { + if (in->dim->n != 3) + RAISE("expecting 3 dimensions: rows,columns,channels"); + if (in->dim->get(2) != 3) + RAISE("expecting 3 channels (got %d)",in->dim->get(2)); + in->set_factor(in->dim->get(1)*in->dim->get(2)); + RAISE("bother, said pooh, as the PNG encoding was found unimplemented"); +} GRID_FLOW { + int rowsize = in->dim->get(1)*in->dim->get(2); + int rowsize2 = in->dim->get(1)*3; + uint8 row[rowsize2]; + while (n) { + bit_packing->pack(in->dim->get(1),data,Pt(row,rowsize)); + n-=rowsize; data+=rowsize; + } +} GRID_FINISH { +} GRID_END + +\def Ruby frame () { + uint8 sig[8]; + if (!fread(sig, 1, 8, f)) return Qfalse; + if (!png_check_sig(sig, 8)) RAISE("bad signature"); + png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + if (!png) RAISE("!png"); + info = png_create_info_struct(png); + if (!info) { + png_destroy_read_struct(&png, NULL, NULL); RAISE("!info"); + } + if (setjmp(png_jmpbuf(png))) { + png_destroy_read_struct(&png, &info, NULL); RAISE("png read error"); + } + png_init_io(png, f); + png_set_sig_bytes(png, 8); // we already read the 8 signature bytes + png_read_info(png, info); // read all PNG info up to image data + png_uint_32 width, height; + int bit_depth, color_type; + png_get_IHDR(png, info, &width, &height, &bit_depth, &color_type, 0,0,0); + + png_bytepp row_pointers = 0; + if (color_type == PNG_COLOR_TYPE_PALETTE + || (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) + || png_get_valid(png, info, PNG_INFO_tRNS)) + png_set_expand(png); + // 16bpp y, 32bpp ya, 48bpp rgb, 64bpp rgba... + if (bit_depth == 16) png_set_strip_16(png); + + double display_gamma = 2.2; + double gamma; + if (png_get_gAMA(png, info, &gamma)) + png_set_gamma(png, display_gamma, gamma); + png_read_update_info(png, info); + + int rowbytes = png_get_rowbytes(png, info); + int channels = (int)png_get_channels(png, info); + Pt image_data = ARRAY_NEW(uint8,rowbytes*height); + row_pointers = new png_bytep[height]; + //gfpost("png: color_type=%d channels=%d, width=%d, rowbytes=%ld, height=%ld, gamma=%f", + // color_type, channels, width, rowbytes, height, gamma); + for (int i=0; i<(int)height; i++) row_pointers[i] = image_data + i*rowbytes; + if ((uint32)rowbytes != width*channels) + RAISE("rowbytes mismatch: %d is not %d*%d=%d", + rowbytes, width, channels, width*channels); + png_read_image(png, row_pointers); + delete row_pointers; + row_pointers = 0; + png_read_end(png, 0); + + GridOutlet out(this,0,new Dim(height, width, channels), + NumberTypeE_find(rb_ivar_get(rself,SI(@cast)))); + out.send(rowbytes*height,image_data); + free(image_data); + png_destroy_read_struct(&png, &info, NULL); + return Qnil; +} + +\def void initialize (Symbol mode, Symbol source, String filename) { + rb_call_super(argc,argv); + if (source!=SYM(file)) RAISE("usage: png file "); + rb_funcall(rself,SI(raw_open),3,mode,source,filename); + Ruby stream = rb_ivar_get(rself,SI(@stream)); + fd = NUM2INT(rb_funcall(stream,SI(fileno),0)); + f = fdopen(fd,mode==SYM(in)?"r":"w"); + uint32 mask[3] = {0x0000ff,0x00ff00,0xff0000}; + bit_packing = new BitPacking(is_le(),3,3,mask); +} + +\classinfo { + IEVAL(rself, + "install '#io:png',1,1;@mode=4;include GridFlow::EventIO; suffixes_are'png'"); +} +\end class FormatPNG +void startup_png () { + \startall +} -- cgit v1.2.1