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/*
$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 <libpng12/png.h>
};
\class FormatPNG < Format
struct FormatPNG : Format {
P<BitPacking> 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<uint8>(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<uint8> 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 <filename>");
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
}
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