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Diffstat (limited to 'externals/gridflow/format/png.c')
| -rw-r--r-- | externals/gridflow/format/png.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/externals/gridflow/format/png.c b/externals/gridflow/format/png.c new file mode 100644 index 00000000..a55ca648 --- /dev/null +++ b/externals/gridflow/format/png.c @@ -0,0 +1,116 @@ +/* + $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 +} |