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/*
$Id: png.c 3624 2008-04-19 02:07:36Z matju $
GridFlow
Copyright (c) 2001-2008 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 "../gridflow.h.fcs"
extern "C" {
#include <libpng12/png.h>
};
\class FormatPNG : Format {
P<BitPacking> bit_packing;
png_structp png;
png_infop info;
\constructor (t_symbol *mode, string filename) {
Format::_0_open(0,0,mode,filename);
uint32 mask[3] = {0x0000ff,0x00ff00,0xff0000};
bit_packing = new BitPacking(is_le(),3,3,mask);
}
\decl 0 bang ();
\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_chunk(1);
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,row);
n-=rowsize; data+=rowsize;
}
} GRID_FINISH {
} GRID_END
\def 0 bang () {
uint8 sig[8];
if (!fread(sig, 1, 8, f)) {outlet_bang(bself->te_outlet); return;}
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);
uint8 *image_data = 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), cast);
out.send(rowbytes*height,image_data);
delete[] image_data;
png_destroy_read_struct(&png, &info, NULL);
}
\classinfo {install_format("#io.png",4,"png");}
\end class FormatPNG
void startup_png () {
\startall
}
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